diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 653fb54..3d73e01 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,7 +12,7 @@ concurrency:
 
 jobs:
   check:
-    name: Type-check and build
+    name: Lint, test, type-check and build
     runs-on: ubuntu-latest
     env:
       # Build against the committed fixtures rather than the private content
@@ -29,6 +29,12 @@ jobs:
 
       - run: npm ci
 
+      # Lint and unit tests run before the content is wired up: neither needs
+      # the vault, and both fail in seconds, so a formatting or logic error does
+      # not wait behind a full Astro build to be reported.
+      - run: npm run lint
+      - run: npm test
+
       # `astro check` needs the generated collection types, which `astro sync`
       # produces; the prebuild hook wires the fixtures into src/content/ first.
       - run: npm run setup:content
diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
index 3b47e3f..4fdc50d 100644
--- a/.github/workflows/release-please.yml
+++ b/.github/workflows/release-please.yml
@@ -38,17 +38,3 @@ jobs:
           manifest-file: .release-please-manifest.json
           # GitHub token (automatically provided by GitHub Actions)
           token: ${{ secrets.GITHUB_TOKEN }}
-
-  # Optional: Automatically merge the release PR when it's ready
-  # Uncomment the following job if you want auto-merge
-  # auto-merge:
-  #   needs: release-please
-  #   if: needs.release-please.outputs.release_created == 'true'
-  #   runs-on: ubuntu-latest
-  #   steps:
-  #     - uses: actions/checkout@v4
-  #     - uses: peter-evans/enable-pull-request-automerge@v3
-  #       with:
-  #         token: ${{ secrets.GITHUB_TOKEN }}
-  #         pull-request-number: ${{ needs.release-please.outputs.pr }}
-
diff --git a/.gitignore b/.gitignore
index bd2f24e..ecb7567 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,7 +9,6 @@ dist/
 src/content/people
 src/content/projects
 src/content/library
-src/content/publications
 # Note: public/ should NOT be ignored - it contains static assets like background.jpg
 # Only ignore generated content in public/attachments/ (synced from content repo)
 public/attachments/
diff --git a/.prettierignore b/.prettierignore
new file mode 100644
index 0000000..01e839a
--- /dev/null
+++ b/.prettierignore
@@ -0,0 +1,19 @@
+# Build output and generated indexes
+dist/
+.astro/
+public/pagefind/
+
+# Vault content: a separate repository, symlinked in by scripts/setup-content.mjs.
+# Reformatting it here would either fail (broken symlink) or rewrite files this
+# repo does not own.
+.content/
+src/content/people/
+src/content/projects/
+src/content/library/
+
+# Fixtures are deliberate regression inputs — several encode exact whitespace
+# and hostile markup that a formatter would helpfully "fix".
+fixtures/
+
+package-lock.json
+CHANGELOG.md
diff --git a/.prettierrc.json b/.prettierrc.json
new file mode 100644
index 0000000..d8179cc
--- /dev/null
+++ b/.prettierrc.json
@@ -0,0 +1,11 @@
+{
+  "singleQuote": true,
+  "printWidth": 100,
+  "plugins": ["prettier-plugin-astro"],
+  "overrides": [
+    {
+      "files": "*.astro",
+      "options": { "parser": "astro" }
+    }
+  ]
+}
diff --git a/FRONTEND_GUIDELINES.md b/FRONTEND_GUIDELINES.md
index 1700d5f..37061a7 100644
--- a/FRONTEND_GUIDELINES.md
+++ b/FRONTEND_GUIDELINES.md
@@ -20,11 +20,16 @@
 
 内容仓库会在 dev/CI 被放到 `.content/`（软链或 clone）。后端会按如下规则映射到 collections：
 
+- `site`: `.content/Team-Guidebook/site.md`（单例；站点身份 + 「关于」页正文）
 - `news`: `.content/Team-Guidebook/档案馆/YYYY-MM-DD.md`（Obsidian 日记，按 bullet 抽取；仅 `publish: true` 才公开）
 - `people`: `.content/Team-Guidebook/通讯录/*.md`
 - `projects`: `.content/Team-Guidebook/图书馆/项目/*.md`
-- `library`: `.content/Team-Guidebook/图书馆/**/*.md`
-- `blog`：**尚未实现**（`src/content.config.ts` 只定义了 people / projects / news / library / publications）。阶段 2 才做独立栏目：`.content/Team-Guidebook/公告板/博客/*.md`
+- `research`: `.content/Team-Guidebook/图书馆/研究/*.md`
+- `resources`: `.content/Team-Guidebook/图书馆/资源/*.md`
+- `publications`: `.content/Team-Guidebook/图书馆/文献/*.bib`，并合并 `文献/精选/<bib_key>.md` sidecar
+- `library`: `.content/Team-Guidebook/图书馆/**/*.md`（排除上述子目录）
+- `translations`: vault 内所有 `**/*.en.md`（正文覆盖层，见 §4.3）
+- `blog`：**尚未实现**
 
 ## 2. 数据接口 (Content Collections API)
 
@@ -36,8 +41,10 @@
 
 | 集合名称 (Collection) | 用途 | 对应路由示例 | 关键字段 (Props) |
 | :--- | :--- | :--- | :--- |
-| `people` | 实验室成员 | `/[lang]/people/[slug]` | `name`, `role`, `avatar`, `email`, `interests` |
-| `projects` | 项目展示 | `/[lang]/projects/[slug]` | `title`, `people` (关联人员ID), `start_date`, `repo` |
+| `people` | 实验室成员 | `/[lang]/people/[slug]` | `name`, `role`（受控词表）, `status`, `avatar`, `email`, `interests` |
+| `projects` | 项目展示 | `/[lang]/projects/[slug]` | `title`, `summary`, `people` (关联人员ID), `start_date`, `repo`, `featured` |
+| `research` | 研究方向 | `/[lang]/research/[slug]` | `title`, `summary`, `order`, 交叉引用 people/projects/publications |
+| `resources` | 数据与工具 | `/[lang]/resources` | `title`, `type`, `url`, `doi`, `license` |
 | `news` | 动态/新闻 | `/[lang]/news` (列表) | `date`, `tags`, `related_people`, `body` (HTML) |
 | `publications` | 论文发表 | `/[lang]/publications` | (特殊) 由 BibTeX 解析的 JSON 对象列表 |
 | `library` | 知识库/Wiki | `/[lang]/library/[...slug]` | 标准 Markdown 内容 |
@@ -120,19 +127,21 @@ interface NewsItem {
 *   **后端承诺**: 默认解析到 Library：`<a href="/[lang]/library/..." class="internal-link">`。
 *   **前端任务**: 为 `.internal-link` 类添加样式 (例如虚线下划线或特定颜色)，以区分普通外部链接。
 
-## 4.3 i18n 范围（现状）
+## 4.3 i18n（现状）
 
-**实现现状**（与早期计划不同，此处描述的是代码实际行为）：
+**已实现**（此处描述的是代码实际行为）：
 
-- `/` 重定向到 `/en/`，默认语言只在 `astro.config.mjs` 一处定义。
-- `/zh` 与 `/en` 两棵路由树**渲染同一份中文内容**——没有任何按语言过滤的逻辑，
-  尽管 `src/content.config.ts` 的 library schema 已声明了 `lang` 字段。
-  差异仅限于 URL 前缀、`<html lang>` 与少量 UI 字符串。
-- `BaseLayout` 已输出 `canonical` 与 `hreflang`，因此重复内容对 SEO 无害；
-  但这不等于 `/en` 是真正的英文站。
+- `/` 重定向到 `/en/`，默认语言只在 `astro.config.mjs` 一处定义（`DEFAULT_LOCALE`）。
+- 中文是基准语言，英文是可选覆盖层。两种机制：
+  - **短字段**在同一文件内成对：`name` / `name_en`、`title` / `title_en`。
+  - **长正文**用兄弟文件 `<name>.en.md`，由 `translations` 集合承载。
+- 缺英文时回退中文，并渲染 `ui.i18n.fallbackNotice` 提示条——**不会出现空页**。
+- 唯一的取值入口是 `src/utils/localized.ts` 的 `pickLocalized` / `pickLocalizedList`
+  与 `resolveLocalized` / `translationIndex`。**页面里不要再写
+  `lang === 'zh' ? … : …` 去取内容字段**——那正是这个模块要消灭的东西。
+- `BaseLayout` 输出 `canonical` 与 `hreflang`；现在它们描述的是真实译文关系。
 
-**待决策**：是按 `data.lang` 过滤（`/en` 只渲染英文条目、其余走空态），
-还是暂时下线 `/en`。在此之前，任何"英文内容"的假设都不成立。
+**尚未覆盖**：News（日记 bullet）只渲染中文原文，英文路由显示同一条。
 
 ## 5. 开发建议
 
diff --git a/README.md b/README.md
index d831d2d..24ff7db 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,12 @@
 
 Astro + TypeScript + Tailwind static site for the lab. Content is Obsidian-driven with direct mapping from the `Team-Guidebook/` vault.
 
-Dual-language routes `/zh` and `/en` are scaffolded, and `/` redirects to **`/en/`** — the default locale is set in exactly one place, `astro.config.mjs`. Note that both trees currently render the same Chinese content; filtering by `data.lang` is not implemented yet.
+Dual-language routes `/zh` and `/en` share one `src/pages/[lang]/` tree, and `/` redirects to **`/en/`** — the default locale is set in exactly one place, `astro.config.mjs`.
+
+Chinese is the base language; English is an optional overlay. Short fields pair
+in one file (`name` / `name_en`), long prose goes in a `<name>.en.md` sibling
+picked up by the `translations` collection. A page with no English falls back to
+the Chinese **and says so**. See [Content Maintenance](./docs/CONTENT_MAINTENANCE.md#双语).
 
 ## Content Sync Strategy
 
diff --git a/docs/CONTENT_MAINTENANCE.md b/docs/CONTENT_MAINTENANCE.md
index 1c52f17..92e07b5 100644
--- a/docs/CONTENT_MAINTENANCE.md
+++ b/docs/CONTENT_MAINTENANCE.md
@@ -1,555 +1,338 @@
 # 内容仓库维护指南
 
-本文档面向内容维护者，说明如何在 `Team-Guidebook` 内容仓库中维护文档，以便正确显示在实验室站点上。
+本文档面向内容维护者，说明如何在 `Team-Guidebook` 内容仓库（Obsidian vault）中组织内容，
+以便正确显示在实验室站点上。
+
+**这份文档是站点与内容之间的契约。** 站点的 Zod schema 定义在
+`src/content.config.ts`，本文档描述的就是它——两者不一致时以代码为准，并请提 issue。
 
 ## 目录结构
 
-内容仓库采用 **Direct Map** 策略，直接使用现有的 Obsidian 目录结构，无需重新组织。站点会自动映射以下目录：
+内容仓库采用 **Direct Map** 策略，直接使用既有的 Obsidian 目录结构：
 
 ```
 Team-Guidebook/
-├── 通讯录/              # People 集合
-│   └── *.md            # 成员信息文件
-├── 图书馆/
-│   ├── 项目/           # Projects 集合
-│   │   └── *.md       # 项目文件
-│   ├── 文献/           # Publications 集合（BibTeX 文件）
-│   │   └── *.bib      # 论文 BibTeX 文件
-│   └── **/*.md         # Library 集合（知识库文档）
-│       ├── 专栏/       # 专栏文章
-│       └── 词条/       # 词条文档
-├── 档案馆/              # News 集合
-│   └── YYYY-MM-DD.md  # 日记文件（Daily Notes）
-├── assets/             # 附件目录（图片、PDF 等）
-└── 图片库/              # 图片附件目录
+├── site.md                  # 站点身份（名称、口号、社交链接）+ 「关于」页正文
+├── 通讯录/                   # People 集合
+│   ├── *.md                 #   成员信息
+│   └── *.en.md              #   成员英文简介（可选，见「双语」）
+├── 档案馆/                   # News 集合
+│   └── YYYY-MM-DD.md        #   Obsidian 日记，按 bullet 抽取
+├── 图书馆/                   # Library 集合（知识库，除下列子目录外）
+│   ├── 项目/*.md             # Projects 集合
+│   ├── 研究/*.md             # Research 集合（研究方向）
+│   ├── 资源/*.md             # Resources 集合（数据与工具）
+│   ├── 文献/
+│   │   ├── *.bib            # Publications 集合（Zotero 导出）
+│   │   └── 精选/<bib_key>.md #   精选论文的补充信息（sidecar）
+│   ├── 专栏/                 # 知识库文章
+│   └── 词条/                 # 知识库词条
+├── assets/                  # 附件（图片、PDF）
+└── 图片库/                   # 图片附件
 ```
 
-## 内容类型维护指南
-
-### 1. People（成员信息）
-
-**位置**：`通讯录/*.md`
-
-**必需字段**：
-- `id`: 唯一标识符（通常与文件名相同，kebab-case）
-- `name`: 显示名称
-- `role`: 角色（如 "教授"、"博士后"、"博士生"、"硕士生"、"校友"）
+> `项目/`、`研究/`、`资源/`、`文献/` 虽然位于 `图书馆/` 之下，但**不属于** Library 集合——
+> 它们各有自己的集合与页面。这条规则定义在 `src/utils/contentLayout.js` 的
+> `OWNED_BY_OTHER_COLLECTIONS`，只有那一处。
 
-**可选字段**：
-- `avatar`: 头像路径（如 `/attachments/avatar.jpg`）
-- `email`: 邮箱地址
-- `aliases`: 别名数组（用于在 News 中通过 `#P/<Name>` 标签关联）
-- `links`: 外部链接数组（如个人主页、GitHub）
-- `interests`: 研究兴趣数组
-- `publish`: 是否发布（默认 `true`）
-- `date`: 创建或更新日期
-- `tags`: 标签数组
-
-**示例**：
-
-```yaml
 ---
-id: alice-wang
-name: 王爱丽丝
-role: 博士生
-avatar: /attachments/alice.jpg
-email: alice@example.com
-aliases:
-  - 爱丽丝
-  - Alice
-links:
-  - label: 个人主页
-    url: https://alice.example.com
-  - label: GitHub
-    url: https://github.com/alice
-interests:
-  - 机器学习
-  - 地理信息系统
-publish: true
-tags:
-  - 机器学习
-  - GIS
----
-
-# 王爱丽丝
-
-我是实验室的博士生，专注于机器学习在地理信息系统中的应用。
-```
 
-**注意事项**：
-- `aliases` 字段用于在 News 日记中通过 `#P/<Name>` 标签自动关联成员
-- 文件名建议使用 kebab-case（如 `alice-wang.md`），与 `id` 保持一致
-- 设置 `publish: false` 可以隐藏成员信息（但文件仍会被处理）
+## 双语
 
-### 2. Projects（项目信息）
+站点有 `/zh` 与 `/en` 两套路由。**中文是基准语言，英文是可选的覆盖层**；缺英文时页面
+回退到中文，并在正文上方显示一条提示——不会出现空白页。
 
-**位置**：`图书馆/项目/*.md`
+机制有两种，按字段长短选择：
 
-**必需字段**：
-- `id`: 唯一标识符
-- `title`: 项目标题
-- `start_date`: 开始日期（格式：`YYYY-MM-DD`）
+### 1. 短字段：同一文件内成对
 
-**可选字段**：
-- `end_date`: 结束日期（格式：`YYYY-MM-DD`，留空表示"进行中"）
-- `people`: 参与人员 ID 数组（必须匹配 People 集合中的 `id`）
-- `repo`: GitHub 仓库 URL
-- `bib_key`: 关联的 BibTeX key（如果有相关论文）
-- `publish`: 是否发布（默认 `true`）
-- `date`: 创建或更新日期
-- `tags`: 标签数组
-
-**示例**：
+在同一个 `.md` 的 frontmatter 里用 `字段` / `字段_en` 成对存放：
 
 ```yaml
----
-id: ml-gis-project
-title: 机器学习在地理信息系统中的应用
-start_date: 2024-01-01
-end_date: 2024-12-31
-people:
-  - alice-wang
-  - bob-li
-repo: https://github.com/lab/ml-gis
-bib_key: mlgis2024
-tags:
-  - 机器学习
-  - GIS
-  - 深度学习
-publish: true
----
-
-# 机器学习在地理信息系统中的应用
-
-这是一个研究项目，旨在探索机器学习技术在地理信息系统中的应用。
-
-## 项目目标
-
-- 目标 1
-- 目标 2
-
-## 进展
-
-项目目前进展顺利...
+name: 宋爽
+name_en: Shuang Song
+title: 研究组长
+title_en: Group Leader
 ```
 
-**注意事项**：
-- `people` 字段中的 ID 必须与 `通讯录/` 中的成员 `id` 匹配
-- 日期格式必须为 `YYYY-MM-DD`
-- 如果项目仍在进行中，可以不设置 `end_date` 或设置为空
-
-### 3. News（动态/新闻）
+> **为什么不整份文件复制两遍**：`email`、`orcid`、`role` 这些与语言无关的字段会被迫
+> 维护两份，然后不可避免地漂移。
 
-**位置**：`档案馆/YYYY-MM-DD.md`（Obsidian Daily Notes）
+支持配对的字段在下文各集合中标注为 `x` / `x_en`。
 
-**发布控制**：
-- 必须在 frontmatter 中设置 `publish: true` 才会被提取
-- 如果设置了 `draft: true`，即使 `publish: true` 也不会被提取
-- 如果 `publish` 字段缺失或为 `false`，文件会被忽略
-
-**内容格式**：
-- 每个 bullet 点（`-` 开头的列表项）会被提取为一个独立的 news 条目
-- 支持 Markdown 格式（粗体、链接、代码等）
-- 使用 `#P/<Name>` 标签关联成员（会自动解析为 `related_people`）
-
-**必需字段**（frontmatter）：
-- `publish: true`（显式设置，否则不会发布）
-
-**可选字段**（frontmatter）：
-- `draft: false`（如果为 `true`，即使 `publish: true` 也不会发布）
-- `date`: 日期（通常从文件名提取，格式：`YYYY-MM-DD`）
-- `tags`: 标签数组
-
-**示例**：
-
-```yaml
----
-publish: true
-draft: false
-date: 2024-12-30
-tags:
-  - 会议
-  - 论文发表
----
+### 2. 长正文：兄弟文件
 
-# 2024-12-30
+在基准文件旁边放一个 `<同名>.en.md`，只写正文：
 
-- 今天参加了 **ICML 2024** 会议，做了关于机器学习的报告 #P/王爱丽丝
-- 我们的论文被 **Nature** 接收了！ #P/王爱丽丝 #P/李波
-- 实验室新成员 #P/张小明 加入了我们的项目
 ```
-
-**注意事项**：
-- 日期通常从文件名提取（`YYYY-MM-DD.md`），但也可以在 frontmatter 中指定
-- `#P/<Name>` 标签会通过 People 集合的 `aliases` 字段解析为成员 ID
-- 如果 `#P/<Name>` 无法匹配到任何成员，会被忽略（不会报错）
-- 每个 bullet 点会成为一个独立的 news 条目，显示在时间轴上
-
-### 4. Library（知识库文档）
-
-**位置**：`图书馆/**/*.md`（不包括 `项目/` 和 `文献/` 子目录）
-
-**特点**：
-- 保留 Obsidian 目录树结构作为侧边栏导航
-- 支持任意深度的嵌套目录
-- Schema 非常宽松，允许额外的 frontmatter 字段
-
-**可选字段**：
-- `title`: 页面标题（默认使用文件名）
-- `lang`: 语言（`zh` 或 `en`，通常从路径推断）
-- `publish`: 是否发布（默认 `true`）
-- `date`: 创建或更新日期
-- `tags`: 标签数组
-
-**示例**：
+通讯录/song-shuang.md      ← 中文，完整 frontmatter + 中文正文
+通讯录/song-shuang.en.md   ← 英文，只需下面两行 frontmatter + 英文正文
+```
 
 ```yaml
 ---
-title: Git 版本控制指南
-lang: zh
-tags:
-  - Git
-  - 版本控制
-  - 工具
-publish: true
+lang: en
+translation_of: song-shuang   # 可选，仅供作者自己对照
 ---
-
-# Git 版本控制指南
-
-这是一篇关于 Git 使用的知识库文档。
-
-## 基本命令
-
-- `git clone`: 克隆仓库
-- `git add`: 添加文件到暂存区
-
-## 相关链接
-
-- [[GitHub]] - GitHub 使用指南
-- [[Mesa-Geo]] - Mesa-Geo 项目文档
-```
-
-**注意事项**：
-- Library 文档支持 WikiLinks（`[[链接]]`），默认解析到 `/[lang]/library/...`
-- 建议使用路径形式的 WikiLinks 避免歧义：`[[词条/Git]]` 而不是 `[[Git]]`
-- 目录结构会保留，URL 路径会根据目录结构自动生成
-- 支持 Obsidian 的所有 Markdown 语法（Callouts、图片嵌入等）
-
-### 5. Publications（论文发表）
-
-**位置**：`图书馆/文献/*.bib` 或 `图书馆/*.bib`
-
-**格式**：BibTeX 文件（`.bib`）
-
-**必需字段**（BibTeX entry）：
-- `title`: 论文标题
-- `author`: 作者列表（用 `and` 分隔）
-- `year`: 发表年份
-
-**可选字段**（BibTeX entry）：
-- `journal` 或 `booktitle`: 发表期刊或会议
-- `doi`: DOI 号（会自动添加 `https://doi.org/` 前缀）
-- `file` 或 `pdf`: PDF 文件路径
-- `keywords`: 关键词（用逗号或分号分隔，会解析为 `tags`）
-
-**示例**：
-
-```bibtex
-@article{mlgis2024,
-  title = {Machine Learning Applications in Geographic Information Systems},
-  author = {Wang, Alice and Li, Bob},
-  journal = {Nature},
-  year = {2024},
-  doi = {10.1038/s41586-024-xxxxx},
-  file = {:/attachments/mlgis2024.pdf:PDF},
-  keywords = {machine learning, GIS, deep learning}
-}
-```
-
-**注意事项**：
-- BibTeX 文件可以包含多个条目，每个条目都会成为一个独立的 publication
-- `keywords` 字段会被解析为 `tags`，用于筛选
-- PDF 路径如果使用 Obsidian 格式（`:/attachments/...`），需要确保文件在 `assets/` 或 `图片库/` 目录中
-- 系统会优先查找 `图书馆/文献/` 目录，如果不存在则查找 `图书馆/` 根目录
-
-## Frontmatter 字段说明
-
-### 通用字段
-
-所有内容类型都支持以下字段：
-
-- **`publish`** (boolean, 默认 `true`): 控制是否在网站上显示
-  - `publish: false` 的内容不会出现在列表中，也不会生成页面路由
-  - 如果字段缺失，默认为 `true`
-
-- **`date`** (string/date, 可选): 创建或更新日期
-  - 格式：`YYYY-MM-DD` 或 ISO 8601 格式
-  - 会自动转换为 Date 对象
-
-- **`tags`** (array, 默认 `[]`): 标签数组
-  - 用于分类和筛选
-  - 示例：`tags: [机器学习, GIS, 深度学习]`
-
-## Obsidian 语法支持
-
-站点完全支持 Obsidian 的 Markdown 语法，包括：
-
-### 1. WikiLinks（内部链接）
-
-**语法**：`[[链接文本]]` 或 `[[链接文本|显示文本]]`
-
-**解析规则**：
-- 默认解析到 Library：`[[Git]]` → `/[lang]/library/git`
-- 建议使用路径形式避免歧义：`[[词条/Git]]` → `/[lang]/library/词条/git`
-- 支持显式语言前缀：`[[en/Page]]` → `/en/library/page`
-- 生成的链接会自动添加 `internal-link` CSS 类
-
-**示例**：
-
-```markdown
-- 查看 [[Git]] 使用指南
-- 参考 [[专栏/Python4Science/Week1_导论]] 了解更多
-- 英文版本：[[en/Git]]
-```
-
-### 2. Callouts（提示框）
-
-**语法**：`> [!TYPE] Title` 后跟内容
-
-**支持的类型**：
-- `note` - 普通提示
-- `info` - 信息提示
-- `tip` - 技巧提示
-- `success` - 成功提示
-- `warning` - 警告提示
-- `danger` 或 `failure` - 危险/失败提示
-- `question` - 问题提示
-- `bug` - Bug 提示
-- `example` - 示例提示
-- `quote` - 引用提示
-
-**示例**：
-
-```markdown
-> [!INFO] 重要提示
-> 这是一个信息提示框，用于突出显示重要信息。
-
-> [!WARNING] 注意事项
-> 使用此功能时请注意以下事项：
-> 1. 第一点
-> 2. 第二点
-
-> [!TIP] 技巧
-> 这是一个小技巧，可以帮助你更高效地工作。
 ```
 
-### 3. 图片嵌入
-
-**语法**：`![[image.png]]` 或 `![[path/to/image.png]]`
-
-**解析规则**：
-- 自动转换为标准 Markdown 图片：`![](/attachments/image.png)`
-- 支持嵌套路径：`![[subfolder/image.png]]` → `![](/attachments/subfolder/image.png)`
-- 图片必须位于 `assets/` 或 `图片库/` 目录中
-
-**示例**：
-
-```markdown
-![描述](![[logo.png]])
-
-或者直接使用：
-
-![[screenshot.png]]
-```
-
-**注意事项**：
-- 图片文件必须存在于 `assets/` 或 `图片库/` 目录中
-- 构建时会自动同步到网站的 `public/attachments/` 目录
-- 如果文件名冲突，构建会发出警告
-
-### 4. 标准 Markdown
-
-所有标准 Markdown 语法都支持：
-- 标题（`#` 到 `######`）
-- 粗体（`**text**`）、斜体（`*text*`）
-- 代码（`` `code` `` 和 ` ``` ` 代码块）
-- 列表（有序和无序）
-- 链接（`[text](url)`）
-- 表格
-- 等等
-
-## 附件管理
-
-### 附件目录
+`.en.md` 文件**只承载正文**。不要在里面重复 `role`、`email` 等字段——它们不会被读取。
 
-附件文件应放在以下目录之一：
+适用于：`通讯录/`、`图书馆/项目/`、`图书馆/研究/`、`图书馆/资源/`、`图书馆/` 知识库。
 
-- `Team-Guidebook/assets/` - 通用附件目录
-- `Team-Guidebook/图片库/` - 图片专用目录
+### 3. News 的双语
 
-### 附件同步
-
-- 构建时会自动将附件同步到网站的 `public/attachments/` 目录
-- 在 Markdown 中引用附件时，使用 `/attachments/文件名` 路径
-- 支持嵌套目录结构
-
-### 附件引用方式
-
-**方式 1：Obsidian 嵌入语法**（推荐）
-
-```markdown
-![[image.png]]
-![[subfolder/document.pdf]]
-```
-
-**方式 2：标准 Markdown 图片**
+日记 bullet 用嵌套子项，避免条目顺序漂移：
 
 ```markdown
-![](/attachments/image.png)
-![描述](/attachments/image.png)
+- 我们的论文被 **Nature** 接收 #P/宋爽
 ```
 
-**方式 3：标准 Markdown 链接**
-
-```markdown
-[下载文档](/attachments/document.pdf)
-```
-
-### 文件名冲突
-
-如果多个附件目录中存在同名文件，构建会发出警告。建议：
-- 使用有意义的文件名避免冲突
-- 使用子目录组织附件
-- 如果必须使用相同文件名，考虑重命名其中一个
-
-## 发布控制
-
-### publish 字段
-
-所有内容类型都支持 `publish` 字段来控制是否在网站上显示：
+> News 目前只渲染中文原文，英文路由显示同一条。这是已知限制，不是 bug。
 
-- `publish: true`（默认）：内容会出现在网站上
-- `publish: false`：内容不会出现在列表中，也不会生成页面路由
+---
 
-**示例**：
+## 各集合字段说明
+
+所有集合都支持 `publish`（布尔，默认 `true`）与 `tags`（数组，默认 `[]`）。
+`publish: false` 的条目既不出现在列表里，也不会生成页面。
+
+### site.md（站点配置，单例）
+
+放在 vault 根目录。**正文会渲染为「关于」页面。**
+
+| 字段 | 必需 | 说明 |
+| :--- | :--- | :--- |
+| `name` / `name_en` | ✅ name | 实验室名称，显示在页头、页脚与首页 |
+| `tagline` / `tagline_en` | | 一句话简介 |
+| `headline` / `headline_en` | | 首页大标题第一行 |
+| `headline_accent` / `headline_accent_en` | | 首页大标题第二行（渐变强调色） |
+| `affiliation` / `affiliation_en` | | 所属机构 |
+| `email`、`address` / `address_en` | | 联系方式，显示在「关于」页 |
+| `logo` | | `/attachments/` 下的路径 |
+| `socials` | | `[{label, url, icon}]`，显示在页脚 |
+| `footer_note` / `footer_note_en` | | 页脚附注 |
+| `nav` | | `[{href, label, label_en}]`，**覆盖**默认导航 |
+
+> `nav` 请谨慎使用。导航项指向的是路由，而路由由代码决定——在这里写一个不存在的页面，
+> 站点会正常构建，读者会拿到 404。不填则使用代码里那份能被验证的默认导航。
+
+### 通讯录/*.md（People）
+
+| 字段 | 必需 | 说明 |
+| :--- | :--- | :--- |
+| `id` | ✅ | 唯一标识，kebab-case，建议与文件名一致 |
+| `name` / `name_en` | ✅ name | 显示名称 |
+| `role` | ✅ | **受控词表**，见下 |
+| `title` / `title_en` | | 自由文本职称，如「副教授」。显示在卡片上 |
+| `order` | | 组内排序；不填则排在填了的后面，再按姓名排 |
+| `status` | | `current`（默认）或 `alumni` |
+| `destination` / `destination_en` | | 校友去向，如「示例大学助理教授」 |
+| `joined` / `left` | | `YYYY-MM-DD` |
+| `avatar` | | 头像路径，如 `/attachments/alice.jpg` |
+| `email` | | 邮箱 |
+| `aliases` | | 别名数组，用于 News 中 `#P/<名字>` 的解析 |
+| `interests` / `interests_en` | | 研究兴趣数组 |
+| `links` | | `[{label, url}]` 自由外链 |
+| `orcid`、`scholar`、`github`、`homepage` | | 学术档案，会渲染成带图标的链接 |
+
+**`role` 受控词表**（定义在 `src/utils/roles.ts`）：
+
+`pi` · `postdoc` · `phd` · `master` · `undergrad` · `staff` · `visitor`
+
+常见中英文写法会自动归一化——`教授`、`Professor`、`Principal Investigator` 都归入 `pi`，
+`博士生`、`PhD Student`、`Ph.D. student` 都归入 `phd`，大小写与首尾空格不敏感。
+**词表之外的写法不会报错**，但会落到「其他成员 / Others」分组里——如果你看到某人出现在
+那里，说明该写法还没被收录，请提 issue 或直接写受控值。
+
+> 从前 `role` 是自由文本，分组靠与十个硬编码写法逐字比对，写成 `Ph.D. student`
+> 或多打一个空格就会自成一组、静默排到最后。
+
+校友单独成组，横跨所有 role——一位毕业的博士生显示在「毕业与离任成员」下，而不是
+仍然出现在「博士生」里。
+
+### 图书馆/项目/*.md（Projects）
+
+| 字段 | 必需 | 说明 |
+| :--- | :--- | :--- |
+| `id` | ✅ | 唯一标识 |
+| `title` / `title_en` | ✅ title | 项目标题 |
+| `summary` / `summary_en` | | 卡片文案，一到两行 |
+| `start_date` | ✅ | `YYYY-MM-DD` |
+| `end_date` | | 留空表示「进行中 / Present」 |
+| `people` | | 成员 `id` 数组 |
+| `research` | | 所属研究方向 `id` 数组 |
+| `repo` | | 代码仓库 URL |
+| `bib_key` | | 关联论文的 BibTeX key |
+| `cover` | | 封面图路径 |
+| `featured` | | `true` 才会出现在首页精选 |
+| `order` | | 精选项目之间的排序 |
+
+> 首页「精选项目」从前是「集合里的前三条」，也就是文件系统碰巧返回的顺序，内容维护者
+> 无法影响。现在必须显式 `featured: true`。
+
+### 图书馆/研究/*.md（Research，研究方向）
+
+研究方向是**常青**的——没有起止日期，比任何单个项目都长久。这正是它与「项目」的区别：
+项目回答「我们现在拿谁的钱在做什么」，方向回答「我们研究什么」。
+
+| 字段 | 必需 | 说明 |
+| :--- | :--- | :--- |
+| `id` | ✅ | 唯一标识 |
+| `title` / `title_en` | ✅ title | 方向名称 |
+| `summary` / `summary_en` | | 卡片一句话 |
+| `order` | | 显示顺序（默认 0）。方向数量少，建议手工排定 |
+| `cover` | | 配图 |
+| `people` | | 负责成员 `id` 数组 |
+| `featured_publications` | | **BibTeX key** 数组，代表论文 |
+| `projects` | | 项目 `id` 数组 |
+
+> 上面三个引用字段在构建时解析。**引用不到的 id 会被静默丢弃**（不渲染死链），
+> 所以如果某篇代表论文没显示出来，先检查 key 是否拼对。
+
+### 图书馆/资源/*.md（Resources，数据与工具）
+
+| 字段 | 必需 | 说明 |
+| :--- | :--- | :--- |
+| `id` | ✅ | 唯一标识 |
+| `title` / `title_en` | ✅ title | 名称 |
+| `type` | ✅ | `dataset` \| `code` \| `model` \| `tool` \| `course` |
+| `url` | ✅ | 获取地址 |
+| `summary` / `summary_en` | | 一句话说明 |
+| `doi` | | 资源本身的 DOI |
+| `repo`、`license`、`version` | | 仓库、许可协议（建议 SPDX）、版本号 |
+| `released` | | `YYYY-MM-DD`，列表按此倒序 |
+| `people` | | 维护者 `id` 数组 |
+| `bib_key` | | 使用时应引用的论文 |
+
+### 图书馆/文献/*.bib（Publications）
+
+**`.bib` 文件由 Zotero 导出，请勿手工添加自定义字段。** Zotero 每次重新导出都会整体
+覆写并丢弃它不认识的字段——写进去的封面图和亮点，会一直存活到下一次导出为止。
+
+必需：`title`、`author`、`year`。可选：`journal` / `booktitle`、`doi`、`keywords`。
+
+- `keywords` 会解析为 `tags` 用于筛选；`English`、`中文` 这类语言名会被自动剔除。
+- `file` / `pdf` 只接受 `http(s)://` 或以 `/` 开头的站内路径。Zotero 默认写入的本地
+  绝对路径（`/Users/…/Zotero/storage/…`）会被忽略，并在构建日志中给出警告。
+- 论文类型由 BibTeX 条目类型推断：`@article`→期刊，`@inproceedings`→会议，
+  `@misc`→预印本，`@incollection`→章节，`@book`→专著，`@phdthesis`→学位论文。
+
+### 图书馆/文献/精选/<bib_key>.md（精选论文 sidecar）
+
+站点需要而 BibTeX 放不下的一切，都写在这里，按 **citation key** 关联。
+文件名即 key（也可用 `bib_key` 字段显式指定）。
 
 ```yaml
 ---
-publish: false  # 这个成员信息不会显示在网站上
-name: 测试用户
-role: 测试角色
+bib_key: zeng2023            # 可省略，默认取文件名
+featured: true               # 默认 true
+order: 1
+cover: /attachments/zeng2023.png
+highlight: 首次量化了…
+highlight_en: The first quantification of…
+author_ids: [song-shuang]    # 本组作者，链接回成员页
+code: https://github.com/...
+data: https://doi.org/...
+press:
+  - outlet: 科技日报
+    outlet_en: Science Daily
+    url: https://...
+    date: 2024-02-01
 ---
 ```
 
-### News 的特殊规则
+> 如果 `bib_key` 在任何 `.bib` 里都找不到，构建会**报警告并指出文件名**。
+> 从前这类错误是静默的，作者只会看到自己的亮点始终不出现。
 
-News 集合有特殊的发布控制规则：
+### 档案馆/YYYY-MM-DD.md（News）
 
-1. **必须显式设置 `publish: true`** 才会被提取
-2. 如果设置了 `draft: true`，即使 `publish: true` 也不会被提取
-3. 如果 `publish` 字段缺失或为 `false`，文件会被完全忽略
+**必须显式 `publish: true` 才会发布**；`draft: true` 会覆盖它。
 
-**示例**：
+每个顶层 bullet（`-` 或 `*` 开头）成为一条独立动态。用 `#P/<名字>` 关联成员，
+其余 `#标签` 解析为 tags。
 
 ```yaml
 ---
-publish: true   # 必须显式设置
-draft: false    # 确保不是草稿
-date: 2024-12-30
+publish: true
+draft: false
 ---
 
 # 2024-12-30
 
-- 这条动态会被发布
+- 今天参加了 **ICML 2024** 会议 #P/王爱丽丝 #会议
+- 我们的论文被 **Nature** 接收了！ #P/王爱丽丝 #P/李波
 ```
 
-## 人员关联（News）
+- 日期从文件名提取（必须是 `YYYY-MM-DD.md`），也可在 frontmatter 中指定。
+- `#P/<名字>` 通过成员的 `id`、文件名、`name` 或 `aliases` 解析。
+  **解析不到会在构建日志中告警**并指出是哪个文件——请留意，这类拼写错误从前是完全静默的。
 
-在 News 日记中，可以使用 `#P/<Name>` 标签关联成员：
+### 图书馆/**/*.md（Library 知识库）
 
-**语法**：`#P/<Name>`
+保留 Obsidian 目录树作为侧边栏导航，schema 宽松，允许额外字段。
 
-**解析规则**：
-- 系统会通过 People 集合的 `aliases` 字段匹配成员
-- 匹配成功后，会自动添加到 `related_people` 字段
-- 如果无法匹配，标签会被忽略（不会报错）
-
-**示例**：
-
-```markdown
-- 今天 #P/王爱丽丝 做了关于机器学习的报告
-- 我们的论文被接收了！ #P/王爱丽丝 #P/李波
-```
+| 字段 | 说明 |
+| :--- | :--- |
+| `title` / `title_en` | 页面标题（默认取文件名） |
+| `description` 或 `excerpt` | 索引页卡片摘要 |
+| `date`、`tags` | 日期与标签 |
+| `lang` | 本篇语言（默认 `zh`）。英文正文通常用 `.en.md` 兄弟文件，不需要手写这个 |
 
-**注意事项**：
-- 确保成员的 `aliases` 字段包含所有可能的名称变体
-- 标签名称必须与 `aliases` 中的某个值完全匹配（区分大小写）
-- 可以在一个 bullet 点中使用多个 `#P/` 标签关联多个成员
+---
 
-## 常见问题
+## Obsidian 语法支持
 
-### Q: 如何隐藏某个内容？
+### WikiLinks
 
-A: 在 frontmatter 中设置 `publish: false`。
+`[[链接]]` 或 `[[链接|显示文本]]`，默认解析到 Library：`[[Git]]` → `/zh/library/词条/Git`。
 
-### Q: News 日记没有被提取？
+- **URL 保留大小写与原路径**（`词条/Git` 不会变成 `词条/git`）。
+- 建议使用路径形式避免歧义：`[[词条/Git]]` 优于 `[[Git]]`。
+- 支持显式语言前缀：`[[en/Page]]`。
+- **解析不到的链接会渲染为带删除样式的 `internal-link-broken`，而不是一个看起来
+  正常却 404 的链接**，同时在构建日志中告警。
 
-A: 检查以下几点：
-1. 文件名格式是否为 `YYYY-MM-DD.md`
-2. frontmatter 中是否设置了 `publish: true`
-3. 是否设置了 `draft: true`（如果设置了，即使 `publish: true` 也不会发布）
-4. 文件中是否有 bullet 点（`-` 开头的列表项）
+### Callouts
 
-### Q: WikiLinks 链接不正确？
+`> [!TYPE] 标题`，支持 `note` `info` `tip` `success` `warning` `danger` `failure`
+`question` `bug` `example` `quote` `abstract`。
 
-A: 
-1. 确保目标文件存在于 Library 集合中
-2. 使用路径形式的 WikiLinks 避免歧义：`[[词条/Git]]` 而不是 `[[Git]]`
-3. 检查文件名和路径是否正确
+### 图片嵌入
 
-### Q: 图片无法显示？
+`![[image.png]]` → `/attachments/image.png`，自动带上 `loading="lazy"`。
+图片须位于 `assets/` 或 `图片库/`，构建时同步到 `public/attachments/`。同名文件会告警。
 
-A: 
-1. 确保图片文件在 `assets/` 或 `图片库/` 目录中
-2. 检查文件名和路径是否正确
-3. 查看构建日志中是否有附件同步错误
+---
 
-### Q: `#P/<Name>` 标签无法关联成员？
+## 常见问题
 
-A: 
-1. 确保成员的 `aliases` 字段包含该名称
-2. 检查标签格式是否正确（`#P/` 前缀，名称区分大小写）
-3. 确保成员文件的 `publish: true`
+**Q：成员出现在「其他成员」分组里？**
+`role` 的写法不在受控词表的别名表内。改用受控值（`pi`/`phd`/…），或提 issue 补充别名。
 
-### Q: Projects 中的 `people` 字段无法关联？
+**Q：英文页面显示的是中文？**
+说明缺少 `.en.md` 兄弟文件（长正文）或 `_en` 字段（短字段）。页面上那条提示条就是在说这件事。
 
-A: 
-1. 确保 `people` 数组中的 ID 与 `通讯录/` 中的成员 `id` 完全匹配
-2. 检查成员文件是否存在且 `publish: true`
-3. ID 区分大小写，必须完全一致
+**Q：精选论文的亮点没显示？**
+检查构建日志。sidecar 的 `bib_key` 对不上任何 `.bib` 条目时会有告警并指出文件名。
 
-### Q: Publications 没有被解析？
+**Q：研究方向里的代表论文/项目没显示？**
+`featured_publications` 用的是 **BibTeX key**，`projects` / `people` 用的是 **id**。
+引用不到的会被静默丢弃。
 
-A: 
-1. 确保 BibTeX 文件在 `图书馆/文献/` 或 `图书馆/` 根目录中
-2. 检查 BibTeX 格式是否正确
-3. 确保每个条目都有 `title`、`author`、`year` 字段
-4. 查看构建日志中是否有解析错误
+**Q：News 日记没被提取？**
+依次检查：文件名是否 `YYYY-MM-DD.md`、是否 `publish: true`、是否 `draft: true`、
+文件里是否有 `-` 开头的 bullet。
 
-## 最佳实践
+**Q：改了内容但 dev server 没更新？**
+News 与 Publications 用的是自定义 loader。**已知限制**：loader 会重新读取，但 Astro 不会
+重新渲染路由，需要重启 dev server。
 
-1. **使用有意义的文件名**：文件名应该清晰描述内容，使用 kebab-case
-2. **保持 frontmatter 简洁**：只包含必要的字段
-3. **使用路径形式的 WikiLinks**：避免歧义，提高可维护性
-4. **合理组织附件**：使用子目录组织附件，避免文件名冲突
-5. **及时更新 `aliases`**：确保 News 中的人员关联正常工作
-6. **使用标签分类**：合理使用 `tags` 字段进行分类
-7. **定期检查 `publish` 状态**：确保只有需要发布的内容设置了 `publish: true`
+---
 
 ## 相关文档
 
-- [配置指南](./CONFIGURATION.md) - 环境变量和内容同步配置
-- [本地测试指南](./LOCAL_TESTING.md) - 本地开发和测试说明
-- [Vercel 部署指南](./VERCEL_DEPLOYMENT.md) - 生产环境部署配置
-- [Giscus 配置指南](./GISCUS_SETUP.md) - 评论系统配置
-
+- [配置指南](./CONFIGURATION.md)
+- [本地测试指南](./LOCAL_TESTING.md)
+- [Vercel 部署指南](./VERCEL_DEPLOYMENT.md)
+- [Giscus 配置指南](./GISCUS_SETUP.md)
diff --git a/eslint.config.js b/eslint.config.js
new file mode 100644
index 0000000..e4fbf35
--- /dev/null
+++ b/eslint.config.js
@@ -0,0 +1,88 @@
+import js from '@eslint/js';
+import globals from 'globals';
+import tseslint from 'typescript-eslint';
+import astro from 'eslint-plugin-astro';
+import jsxA11y from 'eslint-plugin-jsx-a11y';
+import reactHooks from 'eslint-plugin-react-hooks';
+
+/**
+ * Flat config. Three things this repo specifically needs from a linter:
+ *
+ *   1. jsx-a11y — the Library sidebar tree and the avatar <img>s have real
+ *      accessibility gaps that no human review caught.
+ *   2. Coverage of `src/utils/*.js` and `scripts/*.mjs`. `tsconfig.json` sets
+ *      `checkJs: false`, so ~1,400 lines of the most fragile code (path
+ *      resolution, remark AST surgery, recursive deletes) is invisible to
+ *      `astro check`. ESLint is the only tool that sees it.
+ *   3. react-hooks — the islands use effects with subscriptions
+ *      (matchMedia listeners, pagefind init) where a missing cleanup is silent.
+ *
+ * Type-aware linting is deliberately NOT enabled: it would need a project
+ * service covering .astro files, and `astro check` already does the type work.
+ */
+export default tseslint.config(
+  {
+    // Build output, vendored content, and the vault symlinks. src/content/*
+    // are symlinks into the Obsidian vault — linting them would walk content
+    // that this repo does not own.
+    ignores: [
+      'dist/**',
+      '.astro/**',
+      '.content/**',
+      'node_modules/**',
+      'public/pagefind/**',
+      'src/content/people/**',
+      'src/content/projects/**',
+      'src/content/library/**',
+      'fixtures/**',
+    ],
+  },
+
+  js.configs.recommended,
+  ...tseslint.configs.recommended,
+  ...astro.configs.recommended,
+
+  {
+    files: ['**/*.{js,mjs,ts,tsx,astro}'],
+    languageOptions: {
+      ecmaVersion: 2024,
+      sourceType: 'module',
+      globals: { ...globals.browser, ...globals.node },
+    },
+    rules: {
+      // The `any`s in this repo are boundary types for untyped upstreams
+      // (citation-js, pagefind, remark AST nodes). Flagging them as errors
+      // would only invite suppression comments, and there are currently zero
+      // suppressions in the codebase — worth keeping it that way.
+      '@typescript-eslint/no-explicit-any': 'warn',
+      '@typescript-eslint/no-unused-vars': [
+        'error',
+        { argsIgnorePattern: '^_', varsIgnorePattern: '^_' },
+      ],
+      // Loaders legitimately leave a caught error unused when the recovery is
+      // "skip this file and warn".
+      'no-empty': ['error', { allowEmptyCatch: true }],
+    },
+  },
+
+  {
+    files: ['**/*.tsx'],
+    ...jsxA11y.flatConfigs.recommended,
+    plugins: { ...jsxA11y.flatConfigs.recommended.plugins, 'react-hooks': reactHooks },
+    rules: {
+      ...jsxA11y.flatConfigs.recommended.rules,
+      ...reactHooks.configs.recommended.rules,
+    },
+  },
+
+  {
+    // CLI tools: console output IS the interface.
+    files: ['scripts/**/*.mjs'],
+    rules: { 'no-console': 'off' },
+  },
+
+  {
+    files: ['test/**/*.ts'],
+    languageOptions: { globals: globals.node },
+  },
+);
diff --git a/fixtures/Team-Guidebook/site.md b/fixtures/Team-Guidebook/site.md
new file mode 100644
index 0000000..32720f5
--- /dev/null
+++ b/fixtures/Team-Guidebook/site.md
@@ -0,0 +1,25 @@
+---
+name: 示例实验室
+name_en: Fixture Lab
+tagline: 一个用于构建与测试的示例站点
+tagline_en: A fixture site used by CI and by contributors without vault access.
+headline: 进化的
+headline_en: Evolutionary
+headline_accent: 人与水系统
+headline_accent_en: Human-Water System
+affiliation: 示例研究所
+affiliation_en: Institute of Fixtures
+email: lab@example.org
+socials:
+  - label: GitHub
+    url: https://github.com/SongshGeoLab
+    icon: github
+footer_note: 内容以 CC BY 4.0 授权。
+footer_note_en: Content licensed CC BY 4.0.
+---
+
+这是 fixture 站点的简介正文，会渲染在「关于」页面上。真实内容仓库里，这段文字
+描述实验室的研究旨趣。
+
+Not real lab data — `nav` is deliberately omitted here so the build exercises
+the fallback path in `Header.astro`.
diff --git "a/fixtures/Team-Guidebook/\345\233\276\344\271\246\351\246\206/team_papers.bib" "b/fixtures/Team-Guidebook/\345\233\276\344\271\246\351\246\206/\346\226\207\347\214\256/team_papers.bib"
similarity index 100%
rename from "fixtures/Team-Guidebook/\345\233\276\344\271\246\351\246\206/team_papers.bib"
rename to "fixtures/Team-Guidebook/\345\233\276\344\271\246\351\246\206/\346\226\207\347\214\256/team_papers.bib"
diff --git "a/fixtures/Team-Guidebook/\345\233\276\344\271\246\351\246\206/\346\226\207\347\214\256/\347\262\276\351\200\211/lovelace2024fixture.md" "b/fixtures/Team-Guidebook/\345\233\276\344\271\246\351\246\206/\346\226\207\347\214\256/\347\262\276\351\200\211/lovelace2024fixture.md"
new file mode 100644
index 0000000..608866d
--- /dev/null
+++ "b/fixtures/Team-Guidebook/\345\233\276\344\271\246\351\246\206/\346\226\207\347\214\256/\347\262\276\351\200\211/lovelace2024fixture.md"
@@ -0,0 +1,19 @@
+---
+bib_key: lovelace2024fixture
+featured: true
+order: 1
+highlight: 首次在示例尺度上量化了人与水系统的耦合强度。
+highlight_en: The first quantification of human-water coupling strength at fixture scale.
+author_ids:
+  - ada-lovelace
+code: https://github.com/SongshGeoLab/Team-Guidebook-Frontend
+data: https://example.org/fixture-dataset
+press:
+  - outlet: 示例科技日报
+    outlet_en: Example Science Daily
+    url: https://example.org/press/fixture
+    date: 2024-02-01
+---
+
+Sidecar note. The `.bib` file stays exactly as Zotero exported it; everything
+here would be dropped by the next re-export if it were written into the entry.
diff --git "a/fixtures/Team-Guidebook/\345\233\276\344\271\246\351\246\206/\347\240\224\347\251\266/human-water.md" "b/fixtures/Team-Guidebook/\345\233\276\344\271\246\351\246\206/\347\240\224\347\251\266/human-water.md"
new file mode 100644
index 0000000..826d579
--- /dev/null
+++ "b/fixtures/Team-Guidebook/\345\233\276\344\271\246\351\246\206/\347\240\224\347\251\266/human-water.md"
@@ -0,0 +1,18 @@
+---
+id: human-water
+title: 人与水系统的共演
+title_en: Co-evolution of Human-Water Systems
+summary: 研究人类社会与水文系统如何相互塑造。
+summary_en: How human societies and hydrological systems shape one another.
+order: 1
+people:
+  - ada-lovelace
+featured_publications:
+  - lovelace2024fixture
+projects:
+  - sample-project
+tags:
+  - fixture
+---
+
+示例研究方向。研究方向是常青的，没有起止日期——这正是它与「项目」的区别。
diff --git "a/fixtures/Team-Guidebook/\345\233\276\344\271\246\351\246\206/\350\265\204\346\272\220/sample-dataset.md" "b/fixtures/Team-Guidebook/\345\233\276\344\271\246\351\246\206/\350\265\204\346\272\220/sample-dataset.md"
new file mode 100644
index 0000000..1330932
--- /dev/null
+++ "b/fixtures/Team-Guidebook/\345\233\276\344\271\246\351\246\206/\350\265\204\346\272\220/sample-dataset.md"
@@ -0,0 +1,20 @@
+---
+id: sample-dataset
+title: 示例流域数据集
+title_en: Fixture Basin Dataset
+type: dataset
+summary: 一个用于验证 resources 集合的示例数据集。
+summary_en: A fixture dataset used to exercise the resources collection.
+url: https://example.org/fixture-dataset
+doi: 10.0000/fixture-data
+license: CC-BY-4.0
+version: v1.0.0
+released: 2024-03-01
+people:
+  - ada-lovelace
+bib_key: lovelace2024fixture
+tags:
+  - fixture
+---
+
+示例数据集条目，并非真实数据。
diff --git "a/fixtures/Team-Guidebook/\345\233\276\344\271\246\351\246\206/\351\241\271\347\233\256/sample-project.md" "b/fixtures/Team-Guidebook/\345\233\276\344\271\246\351\246\206/\351\241\271\347\233\256/sample-project.md"
index 811ac0d..57af9c4 100644
--- "a/fixtures/Team-Guidebook/\345\233\276\344\271\246\351\246\206/\351\241\271\347\233\256/sample-project.md"
+++ "b/fixtures/Team-Guidebook/\345\233\276\344\271\246\351\246\206/\351\241\271\347\233\256/sample-project.md"
@@ -1,7 +1,12 @@
 ---
 publish: true
 id: sample-project
-title: Sample Project
+title: 示例项目
+title_en: Sample Project
+summary: 一个用于验证卡片文案字段确实存在的示例项目。
+summary_en: A fixture project that proves the card blurb field is real.
+featured: true
+order: 1
 start_date: 2024-01-01
 people:
   - ada-lovelace
diff --git "a/fixtures/Team-Guidebook/\351\200\232\350\256\257\345\275\225/ada-lovelace.en.md" "b/fixtures/Team-Guidebook/\351\200\232\350\256\257\345\275\225/ada-lovelace.en.md"
new file mode 100644
index 0000000..ab7c8ac
--- /dev/null
+++ "b/fixtures/Team-Guidebook/\351\200\232\350\256\257\345\275\225/ada-lovelace.en.md"
@@ -0,0 +1,8 @@
+---
+lang: en
+translation_of: ada-lovelace
+---
+
+Fixture person used by CI and by contributors who do not have access to the
+private content vault. This English body proves the `.en.md` overlay is picked
+up rather than falling back to the Chinese one.
diff --git "a/fixtures/Team-Guidebook/\351\200\232\350\256\257\345\275\225/ada-lovelace.md" "b/fixtures/Team-Guidebook/\351\200\232\350\256\257\345\275\225/ada-lovelace.md"
index 2cf6287..b9bf1ce 100644
--- "a/fixtures/Team-Guidebook/\351\200\232\350\256\257\345\275\225/ada-lovelace.md"
+++ "b/fixtures/Team-Guidebook/\351\200\232\350\256\257\345\275\225/ada-lovelace.md"
@@ -1,14 +1,23 @@
 ---
 id: ada-lovelace
-name: Ada Lovelace
+name: 阿达·洛芙莱斯
+name_en: Ada Lovelace
 aliases:
   - 阿达
+  - Ada Lovelace
 role: Principal Investigator
+title: 研究组长
+title_en: Group Leader
+order: 1
 email: ada@example.org
+orcid: 0000-0002-1825-0097
+github: adalovelace
 interests:
+  - 人水系统
+  - 主体建模
+interests_en:
   - Human-water systems
   - Agent-based modelling
 ---
 
-Fixture person used by CI and by contributors who do not have access to the
-private content vault. Not real lab data.
+供 CI 与无法访问私有内容仓库的贡献者使用的示例成员，并非真实数据。
diff --git "a/fixtures/Team-Guidebook/\351\200\232\350\256\257\345\275\225/grace-hopper.md" "b/fixtures/Team-Guidebook/\351\200\232\350\256\257\345\275\225/grace-hopper.md"
new file mode 100644
index 0000000..0930d97
--- /dev/null
+++ "b/fixtures/Team-Guidebook/\351\200\232\350\256\257\345\275\225/grace-hopper.md"
@@ -0,0 +1,12 @@
+---
+id: grace-hopper
+name: 格蕾丝·霍珀
+name_en: Grace Hopper
+role: PhD Student
+status: alumni
+destination: 示例大学助理教授
+destination_en: Assistant Professor, Example University
+left: 2024-06-30
+---
+
+示例校友，用来验证 alumni 分组与去向渲染。没有英文兄弟文件，因此应回退到中文并给出提示。
diff --git a/lefthook.yml b/lefthook.yml
new file mode 100644
index 0000000..5ed2746
--- /dev/null
+++ b/lefthook.yml
@@ -0,0 +1,28 @@
+# Git hooks. Install once per clone with `npx lefthook install`
+# (the `prepare` script in package.json does this automatically after npm ci).
+#
+# Deliberately fast: only staged files are linted, and the Astro build is left
+# to CI. A hook that takes 30s gets bypassed with --no-verify, which makes it
+# worse than no hook at all.
+
+pre-commit:
+  parallel: true
+  commands:
+    lint:
+      glob: '*.{js,mjs,ts,tsx,astro}'
+      run: npx eslint --max-warnings 0 --no-warn-ignored {staged_files}
+    format:
+      glob: '*.{js,mjs,ts,tsx,astro,json,md,css}'
+      # --write + stage_fixed, not --check: the repo predates Prettier, so a
+      # --check hook would block every commit that touches an old file until
+      # someone reformats it by hand. This formats incrementally instead —
+      # files get cleaned up as they are edited, with no big-bang diff.
+      run: npx prettier --write --ignore-unknown {staged_files}
+      stage_fixed: true
+
+pre-push:
+  commands:
+    # The unit suite is ~0.4s; there is no reason to let a red test reach the
+    # remote and wait for CI to say so.
+    test:
+      run: npm test
diff --git a/package-lock.json b/package-lock.json
index 42ee7a5..c26f831 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,6 +10,7 @@
       "dependencies": {
         "@astrojs/markdown-remark": "^7.2.2",
         "@astrojs/react": "^6.0.2",
+        "@astrojs/sitemap": "^3.7.3",
         "@citation-js/core": "^0.7.0",
         "@citation-js/plugin-bibtex": "^0.7.0",
         "@react-three/drei": "^10.7.8",
@@ -38,11 +39,22 @@
       },
       "devDependencies": {
         "@astrojs/check": "^0.9.10",
-        "@astrojs/sitemap": "^3.7.3",
-        "@types/node": "^20.17.12",
+        "@eslint/js": "^9.39.5",
+        "@types/node": "^22.20.1",
         "@types/react": "^19.2.0",
         "@types/react-dom": "^19.2.0",
-        "typescript": "^6.0.3"
+        "astro-eslint-parser": "^1.4.0",
+        "eslint": "^9.39.5",
+        "eslint-plugin-astro": "^1.7.0",
+        "eslint-plugin-jsx-a11y": "^6.10.2",
+        "eslint-plugin-react-hooks": "^5.2.0",
+        "globals": "^17.11.0",
+        "lefthook": "^2.1.10",
+        "prettier": "^3.9.6",
+        "prettier-plugin-astro": "^0.14.1",
+        "typescript": "^6.0.3",
+        "typescript-eslint": "^8.67.0",
+        "vitest": "^3.2.7"
       },
       "engines": {
         "node": ">=22.0.0"
@@ -396,7 +408,6 @@
       "version": "3.7.3",
       "resolved": "https://registry.npmjs.org/@astrojs/sitemap/-/sitemap-3.7.3.tgz",
       "integrity": "sha512-f8euLVsyeAmAkSm/1M2Kb8sL8byQmfgbvBNaHFItCheTj/IpiJYSEWVcqDHZ/yEHxiS7+w87mQkzwZaPHmk5GA==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "sitemap": "^9.0.0",
@@ -1471,6 +1482,253 @@
         "node": ">=18"
       }
     },
+    "node_modules/@eslint-community/eslint-utils": {
+      "version": "4.10.1",
+      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.10.1.tgz",
+      "integrity": "sha512-cuadcxVFE8sDK6iWJbs8Sn0av2Nrh2QSGQhVlBW9AaAHqHwjWsZHT8LJ4hFGPh7ASBV2deFdM7H/DPjulmh8rg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "eslint-visitor-keys": "^3.4.3"
+      },
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      },
+      "peerDependencies": {
+        "eslint": "^6.0.0 || ^7.0.0 || >=8.0.0"
+      }
+    },
+    "node_modules/@eslint-community/eslint-utils/node_modules/eslint-visitor-keys": {
+      "version": "3.4.3",
+      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-3.4.3.tgz",
+      "integrity": "sha512-wpc+LXeiyiisxPlEkUzU6svyS1frIO3Mgxj1fdy7Pm8Ygzguax2N3Fa/D/ag1WqbOprdI+uY6wMUl8/a2G+iag==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      }
+    },
+    "node_modules/@eslint-community/regexpp": {
+      "version": "4.12.2",
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       "license": "MIT"
     },
+    "node_modules/unbox-primitive": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/unbox-primitive/-/unbox-primitive-1.1.0.tgz",
+      "integrity": "sha512-nWJ91DjeOkej/TA8pXQ3myruKpKEYgqvpw9lz4OPHj/NWFNluYrjbz9j01CJ8yKQd2g4jFoOkINCTW2I5LEEyw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "call-bound": "^1.0.3",
+        "has-bigints": "^1.0.2",
+        "has-symbols": "^1.1.0",
+        "which-boxed-primitive": "^1.1.1"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/uncrypto": {
       "version": "0.1.3",
       "resolved": "https://registry.npmjs.org/uncrypto/-/uncrypto-0.1.3.tgz",
@@ -8271,7 +12324,6 @@
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-      "devOptional": true,
       "license": "MIT"
     },
     "node_modules/unified": {
@@ -8609,6 +12661,16 @@
         "browserslist": ">= 4.21.0"
       }
     },
+    "node_modules/uri-js": {
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
+      "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "dependencies": {
+        "punycode": "^2.1.0"
+      }
+    },
     "node_modules/use-sync-external-store": {
       "version": "1.6.0",
       "resolved": "https://registry.npmjs.org/use-sync-external-store/-/use-sync-external-store-1.6.0.tgz",
@@ -8618,6 +12680,13 @@
         "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0"
       }
     },
+    "node_modules/util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/utility-types": {
       "version": "3.11.0",
       "resolved": "https://registry.npmjs.org/utility-types/-/utility-types-3.11.0.tgz",
@@ -8746,6 +12815,111 @@
         }
       }
     },
+    "node_modules/vite-node": {
+      "version": "3.2.4",
+      "resolved": "https://registry.npmjs.org/vite-node/-/vite-node-3.2.4.tgz",
+      "integrity": "sha512-EbKSKh+bh1E1IFxeO0pg1n4dvoOTt0UDiXMd/qn++r98+jPO1xtJilvXldeuQ8giIB5IkpjCgMleHMNEsGH6pg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "cac": "^6.7.14",
+        "debug": "^4.4.1",
+        "es-module-lexer": "^1.7.0",
+        "pathe": "^2.0.3",
+        "vite": "^5.0.0 || ^6.0.0 || ^7.0.0-0"
+      },
+      "bin": {
+        "vite-node": "vite-node.mjs"
+      },
+      "engines": {
+        "node": "^18.0.0 || ^20.0.0 || >=22.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      }
+    },
+    "node_modules/vite-node/node_modules/es-module-lexer": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/es-module-lexer/-/es-module-lexer-1.7.0.tgz",
+      "integrity": "sha512-jEQoCwk8hyb2AZziIOLhDqpm5+2ww5uIE6lkO/6jcOCusfk6LhMHpXXfBLXTZ7Ydyt0j4VoUQv6uGNYbdW+kBA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/vite-node/node_modules/vite": {
+      "version": "7.3.6",
+      "resolved": "https://registry.npmjs.org/vite/-/vite-7.3.6.tgz",
+      "integrity": "sha512-4XP60spRGjSZFf1qYH+dJIkK2znL3zQfl9KkOV9MkkRR/3Dls0dxaBsQPTloEc5BLXWPL9vsOxopxyKoMmDueg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "esbuild": "^0.27.0 || ^0.28.0",
+        "fdir": "^6.5.0",
+        "picomatch": "^4.0.3",
+        "postcss": "^8.5.6",
+        "rollup": "^4.43.0",
+        "tinyglobby": "^0.2.15"
+      },
+      "bin": {
+        "vite": "bin/vite.js"
+      },
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      },
+      "funding": {
+        "url": "https://github.com/vitejs/vite?sponsor=1"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.3"
+      },
+      "peerDependencies": {
+        "@types/node": "^20.19.0 || >=22.12.0",
+        "jiti": ">=1.21.0",
+        "less": "^4.0.0",
+        "lightningcss": "^1.21.0",
+        "sass": "^1.70.0",
+        "sass-embedded": "^1.70.0",
+        "stylus": ">=0.54.8",
+        "sugarss": "^5.0.0",
+        "terser": "^5.16.0",
+        "tsx": "^4.8.1",
+        "yaml": "^2.4.2"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        },
+        "jiti": {
+          "optional": true
+        },
+        "less": {
+          "optional": true
+        },
+        "lightningcss": {
+          "optional": true
+        },
+        "sass": {
+          "optional": true
+        },
+        "sass-embedded": {
+          "optional": true
+        },
+        "stylus": {
+          "optional": true
+        },
+        "sugarss": {
+          "optional": true
+        },
+        "terser": {
+          "optional": true
+        },
+        "tsx": {
+          "optional": true
+        },
+        "yaml": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/vite/node_modules/lightningcss": {
       "version": "1.33.0",
       "resolved": "https://registry.npmjs.org/lightningcss/-/lightningcss-1.33.0.tgz",
@@ -9026,6 +13200,188 @@
         }
       }
     },
+    "node_modules/vitest": {
+      "version": "3.2.7",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-3.2.7.tgz",
+      "integrity": "sha512-KrxIJ62Fd89gfysR4WotlgZABiz2dqFPgqGzX7s+CwsqLFomRH7777ZcrOD6+WVAh7khPQP41A+BKbpcJFrdEg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/chai": "^5.2.2",
+        "@vitest/expect": "3.2.7",
+        "@vitest/mocker": "3.2.7",
+        "@vitest/pretty-format": "^3.2.7",
+        "@vitest/runner": "3.2.7",
+        "@vitest/snapshot": "3.2.7",
+        "@vitest/spy": "3.2.7",
+        "@vitest/utils": "3.2.7",
+        "chai": "^5.2.0",
+        "debug": "^4.4.1",
+        "expect-type": "^1.2.1",
+        "magic-string": "^0.30.17",
+        "pathe": "^2.0.3",
+        "picomatch": "^4.0.2",
+        "std-env": "^3.9.0",
+        "tinybench": "^2.9.0",
+        "tinyexec": "^0.3.2",
+        "tinyglobby": "^0.2.14",
+        "tinypool": "^1.1.1",
+        "tinyrainbow": "^2.0.0",
+        "vite": "^5.0.0 || ^6.0.0 || ^7.0.0-0",
+        "vite-node": "3.2.4",
+        "why-is-node-running": "^2.3.0"
+      },
+      "bin": {
+        "vitest": "vitest.mjs"
+      },
+      "engines": {
+        "node": "^18.0.0 || ^20.0.0 || >=22.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@types/debug": "^4.1.12",
+        "@types/node": "^18.0.0 || ^20.0.0 || >=22.0.0",
+        "@vitest/browser": "3.2.7",
+        "@vitest/ui": "3.2.7",
+        "happy-dom": "*",
+        "jsdom": "*"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@types/debug": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/vitest/node_modules/@vitest/mocker": {
+      "version": "3.2.7",
+      "resolved": "https://registry.npmjs.org/@vitest/mocker/-/mocker-3.2.7.tgz",
+      "integrity": "sha512-Trr0hYO9CM3Wj6ksWHRhK9IZpIY6wTMO5u/MqXurMxT57sWBaOPEtP3Oq60ihZuh5JsiagKfz95OcxdEP6dBrA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@vitest/spy": "3.2.7",
+        "estree-walker": "^3.0.3",
+        "magic-string": "^0.30.17"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "msw": "^2.4.9",
+        "vite": "^5.0.0 || ^6.0.0 || ^7.0.0-0"
+      },
+      "peerDependenciesMeta": {
+        "msw": {
+          "optional": true
+        },
+        "vite": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/vitest/node_modules/tinyexec": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-0.3.2.tgz",
+      "integrity": "sha512-KQQR9yN7R5+OSwaK0XQoj22pwHoTlgYqmUscPYoknOoWCWfj/5/ABTMRi69FrKU5ffPVh5QcFikpWJI/P1ocHA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/vitest/node_modules/vite": {
+      "version": "7.3.6",
+      "resolved": "https://registry.npmjs.org/vite/-/vite-7.3.6.tgz",
+      "integrity": "sha512-4XP60spRGjSZFf1qYH+dJIkK2znL3zQfl9KkOV9MkkRR/3Dls0dxaBsQPTloEc5BLXWPL9vsOxopxyKoMmDueg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "esbuild": "^0.27.0 || ^0.28.0",
+        "fdir": "^6.5.0",
+        "picomatch": "^4.0.3",
+        "postcss": "^8.5.6",
+        "rollup": "^4.43.0",
+        "tinyglobby": "^0.2.15"
+      },
+      "bin": {
+        "vite": "bin/vite.js"
+      },
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      },
+      "funding": {
+        "url": "https://github.com/vitejs/vite?sponsor=1"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.3"
+      },
+      "peerDependencies": {
+        "@types/node": "^20.19.0 || >=22.12.0",
+        "jiti": ">=1.21.0",
+        "less": "^4.0.0",
+        "lightningcss": "^1.21.0",
+        "sass": "^1.70.0",
+        "sass-embedded": "^1.70.0",
+        "stylus": ">=0.54.8",
+        "sugarss": "^5.0.0",
+        "terser": "^5.16.0",
+        "tsx": "^4.8.1",
+        "yaml": "^2.4.2"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        },
+        "jiti": {
+          "optional": true
+        },
+        "less": {
+          "optional": true
+        },
+        "lightningcss": {
+          "optional": true
+        },
+        "sass": {
+          "optional": true
+        },
+        "sass-embedded": {
+          "optional": true
+        },
+        "stylus": {
+          "optional": true
+        },
+        "sugarss": {
+          "optional": true
+        },
+        "terser": {
+          "optional": true
+        },
+        "tsx": {
+          "optional": true
+        },
+        "yaml": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/volar-service-css": {
       "version": "0.0.71",
       "resolved": "https://registry.npmjs.org/volar-service-css/-/volar-service-css-0.0.71.tgz",
@@ -9374,6 +13730,122 @@
         "node": ">= 8"
       }
     },
+    "node_modules/which-boxed-primitive": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/which-boxed-primitive/-/which-boxed-primitive-1.1.1.tgz",
+      "integrity": "sha512-TbX3mj8n0odCBFVlY8AxkqcHASw3L60jIuF8jFP78az3C2YhmGvqbHBpAjTRH2/xqYunrJ9g1jSyjCjpoWzIAA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "is-bigint": "^1.1.0",
+        "is-boolean-object": "^1.2.1",
+        "is-number-object": "^1.1.1",
+        "is-string": "^1.1.1",
+        "is-symbol": "^1.1.1"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/which-builtin-type": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/which-builtin-type/-/which-builtin-type-1.2.1.tgz",
+      "integrity": "sha512-6iBczoX+kDQ7a3+YJBnh3T+KZRxM/iYNPXicqk66/Qfm1b93iu+yOImkg0zHbj5LNOcNv1TEADiZ0xa34B4q6Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "call-bound": "^1.0.2",
+        "function.prototype.name": "^1.1.6",
+        "has-tostringtag": "^1.0.2",
+        "is-async-function": "^2.0.0",
+        "is-date-object": "^1.1.0",
+        "is-finalizationregistry": "^1.1.0",
+        "is-generator-function": "^1.0.10",
+        "is-regex": "^1.2.1",
+        "is-weakref": "^1.0.2",
+        "isarray": "^2.0.5",
+        "which-boxed-primitive": "^1.1.0",
+        "which-collection": "^1.0.2",
+        "which-typed-array": "^1.1.16"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/which-collection": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/which-collection/-/which-collection-1.0.2.tgz",
+      "integrity": "sha512-K4jVyjnBdgvc86Y6BkaLZEN933SwYOuBFkdmBu9ZfkcAbdVbpITnDmjvZ/aQjRXQrv5EPkTnD1s39GiiqbngCw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "is-map": "^2.0.3",
+        "is-set": "^2.0.3",
+        "is-weakmap": "^2.0.2",
+        "is-weakset": "^2.0.3"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/which-typed-array": {
+      "version": "1.1.22",
+      "resolved": "https://registry.npmjs.org/which-typed-array/-/which-typed-array-1.1.22.tgz",
+      "integrity": "sha512-fvO4ExWMFsqyhG3AiPAObMuY1lxaqgYcxbc49CNdWDDECOJNgQyvsOWVwbZc+qf3rzRtxojBK+CMEv0Ld5CYpw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "available-typed-arrays": "^1.0.7",
+        "call-bind": "^1.0.9",
+        "call-bound": "^1.0.4",
+        "for-each": "^0.3.5",
+        "get-proto": "^1.0.1",
+        "gopd": "^1.2.0",
+        "has-tostringtag": "^1.0.2"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/word-wrap": {
+      "version": "1.2.5",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
+      "integrity": "sha512-BN22B5eaMMI9UMtjrGd5g5eCYPpCPDUy0FJXbYsaT5zYxjFOckS53SQDE3pWkVoWpHXVb3BrYcEN4Twa55B5cA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/wrap-ansi": {
       "version": "9.0.2",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-9.0.2.tgz",
diff --git a/package.json b/package.json
index 9eb4e46..b35fc60 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,13 @@
     "prebuild": "node scripts/setup-content.mjs",
     "setup:content": "node scripts/setup-content.mjs",
     "debug:content": "node scripts/debug-content.mjs",
+    "prepare": "lefthook install || true",
     "check": "astro check",
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "lint": "eslint .",
+    "format": "prettier --write .",
+    "format:check": "prettier --check .",
     "dev": "astro dev",
     "build": "astro build",
     "postbuild": "pagefind --site dist",
@@ -49,9 +55,21 @@
   },
   "devDependencies": {
     "@astrojs/check": "^0.9.10",
-    "@types/node": "^20.17.12",
+    "@eslint/js": "^9.39.5",
+    "@types/node": "^22.20.1",
     "@types/react": "^19.2.0",
     "@types/react-dom": "^19.2.0",
-    "typescript": "^6.0.3"
+    "astro-eslint-parser": "^1.4.0",
+    "eslint": "^9.39.5",
+    "eslint-plugin-astro": "^1.7.0",
+    "eslint-plugin-jsx-a11y": "^6.10.2",
+    "eslint-plugin-react-hooks": "^5.2.0",
+    "globals": "^17.11.0",
+    "lefthook": "^2.1.10",
+    "prettier": "^3.9.6",
+    "prettier-plugin-astro": "^0.14.1",
+    "typescript": "^6.0.3",
+    "typescript-eslint": "^8.67.0",
+    "vitest": "^3.2.7"
   }
 }
diff --git a/pagefind.yml b/pagefind.yml
new file mode 100644
index 0000000..7a06aef
--- /dev/null
+++ b/pagefind.yml
@@ -0,0 +1,13 @@
+# Pagefind runs as a postbuild step over dist/.
+#
+# The important indexing decision is NOT here: `data-pagefind-body` on <main>
+# in src/layouts/BaseLayout.astro is what confines the index to page content.
+# `root_selector` was tried in this file and Pagefind ignored it, reporting
+# "Did not find a data-pagefind-body element ... Indexing all <body> elements".
+#
+# Pagefind reads <html lang> and shards the index per language on its own, so a
+# search from /zh/ already returns Chinese pages; no per-locale config needed.
+site: dist
+
+exclude_selectors:
+  - '[data-pagefind-ignore]'
diff --git a/public/background.jpg b/public/background.jpg
index 129b730..4a78da2 100644
Binary files a/public/background.jpg and b/public/background.jpg differ
diff --git a/scripts/debug-content.mjs b/scripts/debug-content.mjs
index 7883e58..02dc1ae 100644
--- a/scripts/debug-content.mjs
+++ b/scripts/debug-content.mjs
@@ -51,7 +51,13 @@ log('');
 
 // Check Content Collections symlinks
 log('2. Checking Content Collections symlinks:');
-const collections = ['people', 'projects', 'library', 'publications'];
+// Only the collections that setup-content.mjs actually symlinks. `publications`
+// was listed here long after the loader stopped needing a symlink (it reads
+// .content directly), so this diagnostic reported a failure on every healthy
+// checkout — a false alarm baked into the tool meant to find real ones.
+// `research` and `resources` live under the `library` symlink, and `site` and
+// `translations` are globbed from the vault root, so none of them appear here.
+const collections = ['people', 'projects', 'library'];
 
 for (const collection of collections) {
   const collectionPath = path.join(srcContentDir, collection);
diff --git a/scripts/setup-content.mjs b/scripts/setup-content.mjs
index 1189add..1f207ee 100644
--- a/scripts/setup-content.mjs
+++ b/scripts/setup-content.mjs
@@ -120,7 +120,7 @@ const cleanDest = (source) => {
   let stat;
   try {
     stat = fs.lstatSync(dest);
-  } catch (e) {
+  } catch {
     // Path does not exist
     return true;
   }
@@ -133,7 +133,7 @@ const cleanDest = (source) => {
         log(`Reusing existing symlink -> ${source}`);
         return false;
       }
-    } catch (e) {
+    } catch {
       // Broken link or readlink failed, proceed to remove
     }
   } else if (stat.isFile()) {
diff --git a/src/components/Footer.astro b/src/components/Footer.astro
index 224e06b..493f08e 100644
--- a/src/components/Footer.astro
+++ b/src/components/Footer.astro
@@ -1,10 +1,40 @@
 ---
+import { LOCALES, DEFAULT_LOCALE, ui, type Lang } from '../i18n/ui';
+import { getSiteConfig } from '../utils/siteConfig';
+
+const pathname = Astro.url?.pathname ?? '/';
+const first = pathname.split('/').filter(Boolean)[0];
+const lang: Lang = LOCALES.includes(first as Lang) ? (first as Lang) : DEFAULT_LOCALE;
+
+const site = await getSiteConfig(lang);
 const currentYear = new Date().getFullYear();
 ---
-<footer class="border-t border-gray-200 dark:border-gray-800 p-8 mt-8">
-  <div class="container mx-auto text-center text-gray-500">
-    <p>&copy; {currentYear} Lab Website. All rights reserved.</p>
-  </div>
-</footer>
 
+<!-- Same reasoning as Header: the backdrop is always dark. -->
+<footer class="border-t border-white/10 p-8 mt-8">
+  <div class="container mx-auto text-center text-gray-300 space-y-3">
+    <p>&copy; {currentYear} {site.name}. {ui.shell.rightsReserved[lang]}</p>
 
+    {
+      site.footerNote && <p class="text-sm">{site.footerNote}</p>
+    }
+
+    {
+      site.socials.length > 0 && (
+        <ul class="flex items-center justify-center gap-4 text-sm">
+          {site.socials.map((social) => (
+            <li>
+              <a
+                href={social.url}
+                rel="me noopener"
+                class="hover:text-teal-300 transition-colors"
+              >
+                {social.label}
+              </a>
+            </li>
+          ))}
+        </ul>
+      )
+    }
+  </div>
+</footer>
diff --git a/src/components/Header.astro b/src/components/Header.astro
index 045dd35..3e56eec 100644
--- a/src/components/Header.astro
+++ b/src/components/Header.astro
@@ -1,11 +1,20 @@
 ---
-// Derive current locale from the pathname; default to zh.
+import { LOCALES, DEFAULT_LOCALE, ui, type Lang } from '../i18n/ui';
+import { getSiteConfig } from '../utils/siteConfig';
+
+// Derive the current locale from the pathname. Falls back to DEFAULT_LOCALE,
+// not a hardcoded 'zh': this used to default to zh while astro.config.mjs
+// redirected `/` to `/en/` and DEFAULT_LOCALE said 'en' — three answers to
+// "what is the default language".
 const pathname = Astro.url?.pathname ?? '/';
 const pathSegments = pathname.split('/').filter(Boolean);
-const currentLang = pathSegments[0] === 'en' ? 'en' : 'zh';
+const isLocale = (value?: string): value is Lang => LOCALES.includes(value as Lang);
+const currentLang: Lang = isLocale(pathSegments[0]) ? pathSegments[0] : DEFAULT_LOCALE;
+
+const site = await getSiteConfig(currentLang);
 
-const withLang = (lang: 'zh' | 'en') => {
-  if (pathSegments[0] === 'en' || pathSegments[0] === 'zh') {
+const withLang = (lang: Lang) => {
+  if (isLocale(pathSegments[0])) {
     const segments = [...pathSegments];
     segments[0] = lang;
     return `/${segments.join('/')}${pathname.endsWith('/') ? '/' : ''}`;
@@ -13,22 +22,36 @@ const withLang = (lang: 'zh' | 'en') => {
   return `/${lang}/`;
 };
 
-const nav = [
-  { label: currentLang === 'en' ? 'Home' : '首页', href: `/${currentLang}/` },
-  { label: currentLang === 'en' ? 'News' : '动态', href: `/${currentLang}/news/` },
-  { label: currentLang === 'en' ? 'Projects' : '项目', href: `/${currentLang}/projects/` },
-  { label: currentLang === 'en' ? 'Library' : '图书馆', href: `/${currentLang}/library/` },
-  { label: currentLang === 'en' ? 'Publications' : '出版物', href: `/${currentLang}/publications/` },
-  { label: currentLang === 'en' ? 'People' : '团队', href: `/${currentLang}/people/` },
-  { label: currentLang === 'en' ? 'About' : '关于', href: `/${currentLang}/about/` }
+// Routes are code (they have to match what getStaticPaths actually built);
+// labels are translations. site.md may override the whole list, but leaving it
+// unset is the safe default — see the `nav` field's note in content.config.ts.
+const defaultNav = [
+  { label: ui.nav.home[currentLang], href: `/${currentLang}/` },
+  { label: ui.nav.research[currentLang], href: `/${currentLang}/research/` },
+  { label: ui.nav.publications[currentLang], href: `/${currentLang}/publications/` },
+  { label: ui.nav.people[currentLang], href: `/${currentLang}/people/` },
+  { label: ui.nav.projects[currentLang], href: `/${currentLang}/projects/` },
+  { label: ui.nav.resources[currentLang], href: `/${currentLang}/resources/` },
+  { label: ui.nav.news[currentLang], href: `/${currentLang}/news/` },
+  { label: ui.nav.library[currentLang], href: `/${currentLang}/library/` },
+  { label: ui.nav.about[currentLang], href: `/${currentLang}/about/` }
 ];
+const nav = site.nav ?? defaultNav;
 ---
 
-<header class="border-b border-gray-200 dark:border-gray-800">
+<!--
+  Styled light-on-dark unconditionally, NOT via `dark:` variants.
+
+  The backdrop behind every page is a dark photograph under a dark tint, and it
+  does not follow the OS colour scheme — so neither can the chrome on top of it.
+  With `text-gray-700 dark:text-gray-200`, a reader in light mode got #374151
+  text on that dark photo and could not read the nav at all.
+-->
+<header class="border-b border-white/10">
   <div class="container mx-auto px-4 py-4 flex items-center justify-between gap-4">
     <div class="text-lg font-semibold">
       <a href={`/${currentLang}/`} class="hover:opacity-80 transition-opacity">
-        {currentLang === 'en' ? 'Our Lab' : '实验室'}
+        {site.name}
       </a>
     </div>
 
@@ -40,12 +63,12 @@ const nav = [
     <nav
       class="flex items-center gap-6 text-sm font-medium overflow-x-auto whitespace-nowrap
              [-ms-overflow-style:none] [scrollbar-width:none] [&::-webkit-scrollbar]:hidden"
-      aria-label={currentLang === 'en' ? 'Main navigation' : '主导航'}
+      aria-label={ui.shell.mainNav[currentLang]}
     >
       {nav.map((item) => (
         <a
           href={item.href}
-          class="text-gray-700 dark:text-gray-200 hover:text-blue-600 dark:hover:text-blue-400 transition-colors"
+          class="text-gray-200 hover:text-teal-300 transition-colors focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-teal-300"
         >
           {item.label}
         </a>
@@ -55,9 +78,9 @@ const nav = [
     <div class="flex items-center gap-3 text-sm">
       <a
         href={`/${currentLang}/search/`}
-        class="p-2 rounded hover:bg-gray-100 dark:hover:bg-gray-800 transition-colors"
-        aria-label={currentLang === 'en' ? 'Search' : '搜索'}
-        title={currentLang === 'en' ? 'Search' : '搜索'}
+        class="p-2 rounded text-gray-200 hover:bg-white/10 transition-colors focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-teal-300"
+        aria-label={ui.shell.search[currentLang]}
+        title={ui.shell.search[currentLang]}
       >
         <svg
           xmlns="http://www.w3.org/2000/svg"
@@ -69,7 +92,7 @@ const nav = [
           stroke-width="2"
           stroke-linecap="round"
           stroke-linejoin="round"
-          class="text-gray-700 dark:text-gray-200"
+          class="text-gray-200"
         >
           <circle cx="11" cy="11" r="8"></circle>
           <path d="m21 21-4.35-4.35"></path>
@@ -77,13 +100,13 @@ const nav = [
       </a>
       <a
         href={withLang('zh')}
-        class={`px-3 py-1 rounded ${currentLang === 'zh' ? 'bg-blue-600 text-white' : 'hover:bg-gray-100 dark:hover:bg-gray-800'}`}
+        class={`px-3 py-1 rounded ${currentLang === 'zh' ? 'bg-teal-500 text-slate-900 font-medium' : 'text-gray-200 hover:bg-white/10'}`}
       >
         中文
       </a>
       <a
         href={withLang('en')}
-        class={`px-3 py-1 rounded ${currentLang === 'en' ? 'bg-blue-600 text-white' : 'hover:bg-gray-100 dark:hover:bg-gray-800'}`}
+        class={`px-3 py-1 rounded ${currentLang === 'en' ? 'bg-teal-500 text-slate-900 font-medium' : 'text-gray-200 hover:bg-white/10'}`}
       >
         EN
       </a>
diff --git a/src/components/react/RippleBackground.tsx b/src/components/react/RippleBackground.tsx
index 08078b7..8544656 100644
--- a/src/components/react/RippleBackground.tsx
+++ b/src/components/react/RippleBackground.tsx
@@ -139,18 +139,18 @@ function InnerScene({ bgUrl }: { bgUrl: string }) {
       uMouse: { value: [-100, -100] },
       uResolution: { value: [simRes, simRes] },
       uRadius: { value: 0.03 },
-      uViscosity: { value: 0.98 }
+      uViscosity: { value: 0.98 },
     }),
-    [simRes]
+    [simRes],
   );
 
   const distUniforms = useMemo(
     () => ({
       uTexture: { value: bgTexture },
       uDisplacement: { value: null as Texture | null },
-      uTime: { value: 0 }
+      uTime: { value: 0 },
     }),
-    [bgTexture]
+    [bgTexture],
   );
 
   useFrame((state) => {
@@ -189,7 +189,7 @@ function InnerScene({ bgUrl }: { bgUrl: string }) {
             fragmentShader={simulationFragmentShader}
           />
         </mesh>,
-        simScene
+        simScene,
       )}
 
       <mesh>
@@ -207,22 +207,50 @@ function InnerScene({ bgUrl }: { bgUrl: string }) {
 
 export default function RippleBackground({ imageUrl = '/background.jpg' }: { imageUrl?: string }) {
   return (
-    <div className="fixed inset-0 -z-20 bg-black">
+    // aria-hidden: purely decorative, and the canvas has no accessible content
+    // to announce.
+    //
+    // No bg-black and no gradient here. This layer sits at -z-20, directly on
+    // top of BaseLayout's static -z-30 backdrop: painting black would hide that
+    // image during texture load (the flash this was meant to remove), and the
+    // gradient belongs to BaseLayout so it is applied once over whichever
+    // backdrop is showing. See the note beside it there.
+    <div className="fixed inset-0 -z-20" aria-hidden="true">
       <Canvas
         dpr={[1, 2]}
         camera={{ position: [0, 0, 1] }}
         gl={{
           antialias: false,
-          alpha: false,
+          // alpha: true, NOT false — this one flag is the difference between a
+          // clean handover and a ~240ms black flash on every navigation.
+          //
+          // An opaque canvas is cleared to opaque BLACK before anything is
+          // drawn, and `useTexture` below suspends while /background.jpg loads
+          // and decodes. For that whole window the canvas sat at -z-20 painting
+          // black over BaseLayout's static backdrop at -z-30 — measured at four
+          // consecutive samples of luma 12.7 between two lit frames, and absent
+          // whenever the island did not mount.
+          //
+          // Transparent, the canvas shows the static image through until the
+          // first frame draws. Appearance afterwards is unchanged: the
+          // distortion shader writes an opaque pixel (gl_FragColor = color,
+          // alpha 1 from the texture), so nothing composites differently once
+          // there is something to composite.
+          //
+          // NOT done here, deliberately: fading the canvas in on first frame.
+          // The handover from static image to canvas is still a hard cut, and
+          // visible, because the shader renders the same photograph about 13%
+          // darker (measured: luma 46 static, 40 through the canvas). A fade
+          // would only cross-dissolve between two brightnesses that should
+          // match in the first place — tracked separately rather than papered
+          // over here.
+          alpha: true,
           depth: false,
-          stencil: false
+          stencil: false,
         }}
       >
         <InnerScene bgUrl={imageUrl} />
       </Canvas>
-      <div className="absolute inset-0 bg-gradient-to-b from-[#08152dcc] via-[#050b14cc] to-[#02040acc]" />
     </div>
   );
 }
-
-
diff --git a/src/components/react/pages/HomePage.tsx b/src/components/react/pages/HomePage.tsx
index 0291760..c12a727 100644
--- a/src/components/react/pages/HomePage.tsx
+++ b/src/components/react/pages/HomePage.tsx
@@ -1,4 +1,5 @@
 import type { NewsItem, Project } from '../types';
+import type { ResolvedSite } from '../../../utils/siteConfig';
 import { GlassCard } from '../ui/GlassCard';
 import { ui } from '../../../i18n/ui';
 import { NewsTimeline } from '../ui/NewsTimeline';
@@ -9,30 +10,23 @@ interface HomePageProps {
   lang: 'zh' | 'en';
   news: NewsItem[];
   projects: Project[];
+  /**
+   * Lab identity, from the vault's site.md.
+   *
+   * The lab name, institute and hero copy used to be hardcoded here, giving the
+   * site a third identity that disagreed with the two in Header and Footer, and
+   * that no content maintainer could change without a code change.
+   */
+  site: ResolvedSite;
 }
 
 const TEXT = {
-  // The hero renders the title over two lines, the second one in the gradient
-  // accent. Keep the halves here rather than inlining one of them in the JSX —
-  // that is how the two ended up duplicating each other.
-  titleLead: {
-    zh: '进化的',
-    en: 'Evolutionary'
-  },
-  titleAccent: {
-    zh: '人与水系统',
-    en: 'Human-Water System'
-  },
-  heroLead: {
-    zh: '通过水的视角探索人类社会与自然环境的共演',
-    en: 'Exploring the co-evolution between human society and nature through water.'
-  },
   featured: { zh: '精选项目', en: 'Featured Projects' },
   news: { zh: '实验室动态', en: 'Lab News' },
   viewAll: { zh: '查看全部', en: 'View All' }
 };
 
-export function HomePage({ lang, news, projects }: HomePageProps) {
+export function HomePage({ lang, news, projects, site }: HomePageProps) {
   const topNews = news.slice(0, 5);
   const featured = projects.slice(0, 3);
 
@@ -47,24 +41,34 @@ export function HomePage({ lang, news, projects }: HomePageProps) {
         >
           <div className="flex gap-2">
             <span className="px-3 py-1 rounded-full border border-teal-500/30 bg-teal-950/20 text-teal-300 text-xs tracking-wider uppercase">
-              SongshGeo Lab
-            </span>
-            <span className="px-3 py-1 rounded-full border border-white/10 bg-white/5 text-gray-400 text-xs tracking-wider uppercase">
-              Max Planck Institute of Geoanthropology
+              {site.name}
             </span>
+            {site.affiliation && (
+              <span className="px-3 py-1 rounded-full border border-white/10 bg-white/5 text-gray-400 text-xs tracking-wider uppercase">
+                {site.affiliation}
+              </span>
+            )}
           </div>
 
+          {/* Falls back to the lab name when site.md declares no headline, so
+              the hero is never an empty block. */}
           <h1 className="text-5xl md:text-7xl font-light tracking-tight text-white leading-[1.1] drop-shadow-lg">
-            {TEXT.titleLead[lang]}
-            <br />
-            <span className="text-transparent bg-clip-text bg-gradient-to-r from-teal-200 to-blue-400 font-normal">
-              {TEXT.titleAccent[lang]}
-            </span>
+            {site.headline ?? site.name}
+            {site.headlineAccent && (
+              <>
+                <br />
+                <span className="text-transparent bg-clip-text bg-gradient-to-r from-teal-200 to-blue-400 font-normal">
+                  {site.headlineAccent}
+                </span>
+              </>
+            )}
           </h1>
 
-          <p className="text-xl text-gray-300 max-w-xl font-light leading-relaxed border-l-2 border-teal-500/50 pl-6">
-            {TEXT.heroLead[lang]}
-          </p>
+          {site.tagline && (
+            <p className="text-xl text-gray-300 max-w-xl font-light leading-relaxed border-l-2 border-teal-500/50 pl-6">
+              {site.tagline}
+            </p>
+          )}
 
           <div className="flex gap-4 pt-4">
             <a
@@ -99,7 +103,7 @@ export function HomePage({ lang, news, projects }: HomePageProps) {
             <GlassCard
               key={project.id}
               className="p-6 flex flex-col h-full group"
-              onClick={() => window.location.assign(project.detailUrl || `/${lang}/projects/${project.id}`)}
+              href={project.detailUrl || `/${lang}/projects/${project.id}`}
             >
               <div className="flex justify-between items-start mb-4">
                 <div className="p-2 bg-teal-500/20 rounded-lg text-teal-300">
diff --git a/src/components/react/pages/PeoplePage.tsx b/src/components/react/pages/PeoplePage.tsx
index 78ed8a4..6e9e255 100644
--- a/src/components/react/pages/PeoplePage.tsx
+++ b/src/components/react/pages/PeoplePage.tsx
@@ -1,99 +1,122 @@
 import type { Person } from '../types';
 import { motion } from 'motion/react';
+import { ALUMNI_LABEL, ROLES, ROLE_LABELS, ROLE_TITLES } from '../../../utils/roles';
+import { ui } from '../../../i18n/ui';
 
 interface PeoplePageProps {
   lang: 'zh' | 'en';
   people: Person[];
 }
 
-const ROLE_ORDER: string[] = [
-  'Professor',
-  '教授',
-  'Postdoc',
-  '博士后',
-  'PhD Student',
-  '博士生',
-  'Master Student',
-  '硕士生',
-  'Alumni',
-  '校友'
-];
+function PersonCard({ person, lang, idx }: { person: Person; lang: 'zh' | 'en'; idx: number }) {
+  // The free-text job title if the author wrote one, else the singular form of
+  // the role. ROLE_LABELS would say "PhD Students" on one person's card;
+  // rendering `person.role` raw would print the internal slug ("phd").
+  const subtitle = person.title ?? ROLE_TITLES[person.role][lang];
+
+  return (
+    <motion.a
+      href={person.detailUrl || `/${lang}/people/${person.id}`}
+      initial={{ opacity: 0, scale: 0.95 }}
+      whileInView={{ opacity: 1, scale: 1 }}
+      viewport={{ once: true }}
+      transition={{ delay: idx * 0.05 }}
+      className="flex items-center gap-4 p-3 rounded-2xl bg-white/5 hover:bg-teal-900/20 border border-white/5 hover:border-teal-500/30 transition-all backdrop-blur-sm focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-teal-300"
+    >
+      <div className="relative w-12 h-12 shrink-0">
+        {person.avatar ? (
+          <img
+            src={person.avatar}
+            alt=""
+            /* Intrinsic size and lazy loading: these come from the vault via
+               public/attachments, so astro:assets cannot reach them, but the
+               attributes that stop layout shift cost nothing. The markdown
+               pipeline already sets both on embedded images. */
+            width={48}
+            height={48}
+            loading="lazy"
+            decoding="async"
+            className="w-12 h-12 rounded-full object-cover ring-1 ring-white/10"
+          />
+        ) : (
+          <div
+            aria-hidden="true"
+            className="w-12 h-12 rounded-full bg-gray-700 flex items-center justify-center text-white"
+          >
+            {person.name.slice(0, 1)}
+          </div>
+        )}
+      </div>
+
+      <div className="min-w-0 flex-1">
+        <h3 className="text-sm font-medium text-white truncate">{person.name}</h3>
+        {/* Was text-[10px] at 60% opacity over a translucent surface, which
+            fails WCAG AA on contrast and size. */}
+        <p className="text-xs text-teal-200 font-mono tracking-wider truncate">{subtitle}</p>
+        {person.destination && (
+          <p className="text-xs text-gray-300 truncate">{person.destination}</p>
+        )}
+        {person.email && <p className="text-xs text-gray-400 truncate">{person.email}</p>}
+      </div>
+    </motion.a>
+  );
+}
 
 export function PeoplePage({ lang, people }: PeoplePageProps) {
-  const grouped = people.reduce<Record<string, Person[]>>((acc, person) => {
-    const role = person.role || 'Other';
-    acc[role] = acc[role] || [];
-    acc[role].push(person);
-    return acc;
-  }, {});
+  // Alumni cut across roles — a former PhD student belongs under "Alumni", not
+  // under "PhD Students", where a reader would take them for a current member.
+  const current = people.filter((p) => p.status !== 'alumni');
+  const alumni = people.filter((p) => p.status === 'alumni');
 
-  const roles = Object.keys(grouped).sort((a, b) => {
-    const ai = ROLE_ORDER.indexOf(a);
-    const bi = ROLE_ORDER.indexOf(b);
-    return (ai === -1 ? 999 : ai) - (bi === -1 ? 999 : bi);
-  });
+  // Iterate ROLES rather than the roles that happen to appear, so section order
+  // comes from the vocabulary instead of from filesystem order. Grouping used
+  // to compare free text against ten hardcoded spellings, and anything else —
+  // 'Ph.D. student', '副教授', a trailing space — became its own one-person
+  // section sorted to the end.
+  const sections = ROLES.map((role) => ({
+    role,
+    label: ROLE_LABELS[role][lang],
+    members: current.filter((p) => p.role === role),
+  })).filter((section) => section.members.length > 0);
 
   return (
     <div className="space-y-12">
       <div className="p-6 rounded-2xl bg-slate-950/20 backdrop-blur-md border border-white/10 shadow-lg">
         <h1 className="text-3xl md:text-4xl font-light text-white mb-2 tracking-tight">
-          {lang === 'zh' ? '团队成员' : 'Team'}
+          {ui.people.title[lang]}
         </h1>
-        <p className="text-lg text-teal-100/80 font-light">
-          {lang === 'zh'
-            ? '来自不同背景的研究者、设计师与工程师。'
-            : 'Researchers, designers, and engineers passionate about water systems.'}
-        </p>
+        <p className="text-lg text-teal-100/80 font-light">{ui.people.description[lang]}</p>
       </div>
 
-      {roles.map((role) => (
-        <section key={role} className="space-y-6">
+      {sections.map((section) => (
+        <section key={section.role} className="space-y-6">
           <h2 className="text-xl font-light text-teal-100/80 flex items-center gap-4">
-            {role}
+            {section.label}
             <span className="h-px flex-1 bg-white/5" />
           </h2>
 
           <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
-            {grouped[role].map((person, idx) => (
-              <motion.a
-                key={person.id}
-                href={person.detailUrl || `/${lang}/people/${person.id}`}
-                initial={{ opacity: 0, scale: 0.95 }}
-                whileInView={{ opacity: 1, scale: 1 }}
-                viewport={{ once: true }}
-                transition={{ delay: idx * 0.05 }}
-                className="flex items-center gap-4 p-3 rounded-2xl bg-white/5 hover:bg-teal-900/20 border border-white/5 hover:border-teal-500/30 transition-all backdrop-blur-sm"
-              >
-                <div className="relative w-12 h-12 shrink-0">
-                  {person.avatar ? (
-                    <img
-                      src={person.avatar}
-                      alt={person.name}
-                      className="w-12 h-12 rounded-full object-cover ring-1 ring-white/10"
-                    />
-                  ) : (
-                    <div className="w-12 h-12 rounded-full bg-gray-700 flex items-center justify-center text-white">
-                      {person.name.slice(0, 1)}
-                    </div>
-                  )}
-                </div>
-
-                <div className="min-w-0 flex-1">
-                  <h3 className="text-sm font-medium text-white truncate">{person.name}</h3>
-                  <p className="text-[10px] text-teal-200/60 font-mono uppercase tracking-wider truncate">
-                    {person.role}
-                  </p>
-                  {person.email && (
-                    <p className="text-xs text-gray-500 truncate">{person.email}</p>
-                  )}
-                </div>
-              </motion.a>
+            {section.members.map((person, idx) => (
+              <PersonCard key={person.id} person={person} lang={lang} idx={idx} />
             ))}
           </div>
         </section>
       ))}
+
+      {alumni.length > 0 && (
+        <section className="space-y-6">
+          <h2 className="text-xl font-light text-teal-100/80 flex items-center gap-4">
+            {ALUMNI_LABEL[lang]}
+            <span className="h-px flex-1 bg-white/5" />
+          </h2>
+
+          <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
+            {alumni.map((person, idx) => (
+              <PersonCard key={person.id} person={person} lang={lang} idx={idx} />
+            ))}
+          </div>
+        </section>
+      )}
     </div>
   );
 }
-
-
diff --git a/src/components/react/pages/SearchPage.tsx b/src/components/react/pages/SearchPage.tsx
index 241d422..a11539f 100644
--- a/src/components/react/pages/SearchPage.tsx
+++ b/src/components/react/pages/SearchPage.tsx
@@ -246,6 +246,11 @@ export function SearchPage({ lang }: SearchPageProps) {
             onChange={(e) => setQuery(e.target.value)}
             placeholder={TEXT.placeholder[lang]}
             className="w-full bg-white/10 backdrop-blur-md border border-white/20 rounded-full pl-12 pr-6 py-4 text-lg text-white placeholder-gray-400 focus:outline-none focus:ring-2 focus:ring-teal-500/50 focus:border-teal-500/50 transition-all"
+            /* This is a dedicated /search route reached by clicking the
+               magnifier; typing is its only purpose, so autofocus saves every
+               user a second click rather than stealing focus from surrounding
+               content. The rule's own docs name this as the exception. */
+            // eslint-disable-next-line jsx-a11y/no-autofocus
             autoFocus
           />
           {isLoading && (
diff --git a/src/components/react/types.ts b/src/components/react/types.ts
index a896da7..1200e17 100644
--- a/src/components/react/types.ts
+++ b/src/components/react/types.ts
@@ -1,7 +1,23 @@
+import type { Role } from '../../utils/roles';
+
+/**
+ * Props passed from .astro pages into the React islands.
+ *
+ * These are serialisation shapes, not the schema: dates arrive as ISO strings
+ * because that is what crosses the island boundary, and localised fields have
+ * already been resolved to one language by the page. Anything that should
+ * match content.config.ts is imported from there (see `Role`) rather than
+ * restated — restating is how `Project.summary` came to exist here, be
+ * rendered by HomePage, and be supplied by nothing.
+ */
 export interface Person {
   id: string;
   name: string;
-  role: string;
+  /** Canonical role, for grouping. The free-text job title is `title`. */
+  role: Role;
+  title?: string;
+  status?: 'current' | 'alumni';
+  destination?: string;
   avatar?: string;
   email?: string;
   interests?: string[];
@@ -12,13 +28,14 @@ export interface Person {
 export interface Project {
   id: string;
   title: string;
+  summary?: string;
+  cover?: string;
   start_date?: string;
   end_date?: string;
   people?: string[];
   tags?: string[];
   repo?: string;
   detailUrl?: string;
-  summary?: string;
 }
 
 export interface NewsItem {
diff --git a/src/components/react/ui/GiscusComments.tsx b/src/components/react/ui/GiscusComments.tsx
index 611e6a9..c51a1f8 100644
--- a/src/components/react/ui/GiscusComments.tsx
+++ b/src/components/react/ui/GiscusComments.tsx
@@ -132,11 +132,12 @@ export function GiscusComments({
 
     scriptLoadedRef.current = true;
 
-    // Cleanup function
+    // Cleanup function.
+    // Detach via the script's own parentNode rather than containerRef.current:
+    // by the time cleanup runs the ref may already point elsewhere (or be
+    // null), which would leak the iframe. The script knows its own parent.
     return () => {
-      if (containerRef.current && script.parentNode) {
-        script.parentNode.removeChild(script);
-      }
+      script.parentNode?.removeChild(script);
       scriptLoadedRef.current = false;
     };
   }, [
diff --git a/src/components/react/ui/GlassCard.tsx b/src/components/react/ui/GlassCard.tsx
index bb9537d..91e7d83 100644
--- a/src/components/react/ui/GlassCard.tsx
+++ b/src/components/react/ui/GlassCard.tsx
@@ -4,23 +4,34 @@ import clsx from 'clsx';
 interface GlassCardProps {
   children: ReactNode;
   className?: string;
-  onClick?: () => void;
+  /**
+   * Makes the whole card a link.
+   *
+   * This used to be an `onClick` that called `window.location.assign` on a
+   * `<div>`. That card could not be reached by keyboard, announced nothing to a
+   * screen reader, and had no URL to middle-click or copy. Rendering a real
+   * anchor gets focus, Enter, the status-bar preview and open-in-new-tab for
+   * free — none of which a click handler can reproduce.
+   */
+  href?: string;
 }
 
-export function GlassCard({ children, className, onClick }: GlassCardProps) {
-  return (
-    <div
-      onClick={onClick}
-      className={clsx(
-        'bg-white/5 border border-white/10 backdrop-blur-md shadow-lg',
-        'transition-all duration-300',
-        onClick && 'cursor-pointer hover:border-teal-300/50 hover:shadow-[0_0_20px_-5px_rgba(20,184,166,0.2)]',
-        className
-      )}
-    >
-      {children}
-    </div>
+export function GlassCard({ children, className, href }: GlassCardProps) {
+  const classes = clsx(
+    'bg-white/5 border border-white/10 backdrop-blur-md shadow-lg',
+    'transition-all duration-300',
+    href &&
+      'cursor-pointer hover:border-teal-300/50 hover:shadow-[0_0_20px_-5px_rgba(20,184,166,0.2)] focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-teal-300',
+    className
   );
-}
 
+  if (href) {
+    return (
+      <a href={href} className={classes}>
+        {children}
+      </a>
+    );
+  }
 
+  return <div className={classes}>{children}</div>;
+}
diff --git a/src/content.config.ts b/src/content.config.ts
index 2963822..f12850b 100644
--- a/src/content.config.ts
+++ b/src/content.config.ts
@@ -1,6 +1,12 @@
 import { defineCollection, z } from 'astro:content';
 import { glob } from 'astro/loaders';
-import { OWNED_BY_OTHER_COLLECTIONS_GLOBS } from './utils/contentLayout.js';
+import {
+  OWNED_BY_OTHER_COLLECTIONS_GLOBS,
+  TRANSLATION_GLOBS,
+  CONTENT_LOCALES,
+  findContentRoot,
+} from './utils/contentLayout.js';
+import { normalizeRole } from './utils/roles';
 import { newsLoader } from './content/loaders/newsLoader';
 import { publicationsLoader } from './content/loaders/publicationsLoader';
 
@@ -22,15 +28,50 @@ const baseSchema = {
   tags: z.union([z.array(z.string()), z.null()]).default([]).transform(val => val || []).describe('Tags for categorization'),
 };
 
+/**
+ * Translation overlays: `<name>.en.md` beside the note it translates.
+ *
+ * These carry a body and nothing else. Language-independent facts — a person's
+ * role, email, ORCID — live once in the base note; duplicating them per
+ * language is how the two copies drift. See src/utils/localized.ts for the
+ * pairing, and note that overlays are excluded from every base collection by
+ * TRANSLATION_GLOBS so a translation can never become a second person.
+ */
+const translationSchema = z.object({
+  lang: z.enum(CONTENT_LOCALES as [string, ...string[]]).describe('Locale of this body'),
+  translation_of: z.string().optional().describe('Base id, for the author\'s reference'),
+  title: z.string().optional().describe('Translated page title, where one is shown'),
+  publish: z.boolean().default(true),
+});
+
 /**
  * People collection schema.
- * Maps from: .content/Team-Guidebook/通讯录/ (all .md files)
+ * Maps from: .content/Team-Guidebook/通讯录/ (all .md files bar translations)
  */
 const peopleSchema = z.object({
-  ...baseSchema,
+  publish: baseSchema.publish,
+  tags: baseSchema.tags,
   id: z.string().describe('Unique identifier (slug)'),
   name: z.string().describe('Display name'),
-  role: z.string().describe('Role (e.g., "PhD Student", "Professor")'),
+  name_en: z.string().optional().describe('Display name in English'),
+  /**
+   * Canonical position, used for grouping.
+   *
+   * Normalised rather than validated as an enum: the vault predates this
+   * vocabulary, so 'Professor', '教授', ' PhD Student ' and 'phd' must all keep
+   * working. Free-text job titles belong in `title`, not here — this field only
+   * decides which section the person appears in.
+   */
+  role: z.string().transform(normalizeRole).describe('Position: pi | postdoc | phd | master | undergrad | staff | visitor'),
+  title: z.string().optional().describe('Free-text job title shown on the card, e.g. 副教授'),
+  title_en: z.string().optional(),
+  /** Sort key within a role section. Unset sorts last, then by name. */
+  order: z.number().optional().describe('Display order within the role group'),
+  status: z.enum(['current', 'alumni']).default('current').describe('Still in the group?'),
+  destination: z.string().optional().describe('Where an alumnus went next'),
+  destination_en: z.string().optional(),
+  joined: z.union([z.date(), z.string()]).optional().transform(val => val ? new Date(val) : undefined),
+  left: z.union([z.date(), z.string()]).optional().transform(val => val ? new Date(val) : undefined),
   avatar: z.string().optional().describe('Avatar image path (e.g., "/attachments/avatar.jpg")'),
   email: z.string().email().optional().describe('Email address'),
   aliases: z.union([z.array(z.string()), z.null()]).default([]).transform(val => val || []).describe('Alternative names for resolving #P/<Name> tags'),
@@ -38,7 +79,15 @@ const peopleSchema = z.object({
     label: z.string(),
     url: z.string().url(),
   })).optional().describe('External links (homepage, GitHub, etc.)'),
+  // Declared separately from `links` because each has a known icon and a known
+  // URL shape, so the UI can render them consistently instead of hoping the
+  // author typed a matching label.
+  orcid: z.string().optional().describe('ORCID iD or URL'),
+  scholar: z.string().url().optional().describe('Google Scholar profile URL'),
+  github: z.string().optional().describe('GitHub username or URL'),
+  homepage: z.string().url().optional().describe('Personal homepage'),
   interests: z.array(z.string()).optional().describe('Research interests'),
+  interests_en: z.array(z.string()).optional(),
 });
 
 /**
@@ -46,14 +95,83 @@ const peopleSchema = z.object({
  * Maps from: .content/Team-Guidebook/图书馆/项目/ (all .md files)
  */
 const projectsSchema = z.object({
-  ...baseSchema,
+  publish: baseSchema.publish,
+  tags: baseSchema.tags,
   id: z.string().describe('Unique identifier (slug)'),
   title: z.string().describe('Project title'),
+  title_en: z.string().optional(),
+  /**
+   * Card blurb.
+   *
+   * `Project.summary` was declared in the React DTO and rendered by HomePage,
+   * but no schema declared it and no page supplied it — a phantom field that
+   * was permanently undefined, so the card body was permanently blank.
+   */
+  summary: z.string().optional().describe('One-or-two-line blurb for the card'),
+  summary_en: z.string().optional(),
+  cover: z.string().optional().describe('Cover image path under /attachments'),
   start_date: z.union([z.date(), z.string()]).transform(val => typeof val === 'string' ? new Date(val) : val).describe('Project start date'),
   end_date: z.union([z.date(), z.string()]).optional().transform(val => val ? (typeof val === 'string' ? new Date(val) : val) : undefined).describe('Project end date (empty means "Present")'),
   people: z.array(z.string()).default([]).describe('Array of Person IDs (must match people collection)'),
+  research: z.array(z.string()).default([]).describe('Research theme ids this project belongs to'),
   repo: z.string().url().optional().describe('GitHub repository URL'),
   bib_key: z.string().optional().describe('BibTeX key for associated publication'),
+  // The home page used to show "featured" projects by taking the first three in
+  // collection order — i.e. whatever the filesystem happened to return.
+  featured: z.boolean().default(false).describe('Show on the home page'),
+  order: z.number().optional().describe('Sort key among featured projects'),
+});
+
+/**
+ * Research themes — the evergreen directions the group works on.
+ * Maps from: .content/Team-Guidebook/图书馆/研究/
+ *
+ * Deliberately distinct from `projects`. A project has a start date, an end
+ * date and a funder; a theme has neither and outlives any one project. Folding
+ * them together would mean either dating a theme arbitrarily or making
+ * `start_date` optional on projects, and a reader would lose the distinction
+ * between "what we study" and "what we are currently paid to do".
+ */
+const researchSchema = z.object({
+  publish: baseSchema.publish,
+  tags: baseSchema.tags,
+  id: z.string().describe('Unique identifier (slug)'),
+  title: z.string().describe('Theme name'),
+  title_en: z.string().optional(),
+  summary: z.string().optional().describe('One or two lines for the card'),
+  summary_en: z.string().optional(),
+  order: z.number().default(0).describe('Display order; themes are few and hand-ordered'),
+  cover: z.string().optional().describe('Illustration path under /attachments'),
+  people: z.array(z.string()).default([]).describe('Person ids leading this theme'),
+  /** BibTeX keys. The join is checked at build time by the research page. */
+  featured_publications: z.array(z.string()).default([]).describe('bib_key values to showcase'),
+  projects: z.array(z.string()).default([]).describe('Project ids under this theme'),
+});
+
+/**
+ * Datasets, code and tools the group publishes.
+ * Maps from: .content/Team-Guidebook/图书馆/资源/
+ */
+const resourcesSchema = z.object({
+  publish: baseSchema.publish,
+  tags: baseSchema.tags,
+  id: z.string().describe('Unique identifier (slug)'),
+  title: z.string(),
+  title_en: z.string().optional(),
+  type: z
+    .enum(['dataset', 'code', 'model', 'tool', 'course'])
+    .describe('What kind of resource this is; drives the icon and the filter'),
+  summary: z.string().optional(),
+  summary_en: z.string().optional(),
+  url: z.string().url().describe('Where to get it'),
+  doi: z.string().optional().describe('DOI for citing the resource itself'),
+  repo: z.string().url().optional(),
+  license: z.string().optional().describe('SPDX identifier or licence name'),
+  version: z.string().optional(),
+  released: z.union([z.date(), z.string()]).optional().transform(val => val ? new Date(val) : undefined),
+  people: z.array(z.string()).default([]).describe('Person ids who maintain it'),
+  bib_key: z.string().optional().describe('The paper to cite when using this'),
+  cover: z.string().optional(),
 });
 
 /**
@@ -80,7 +198,16 @@ const librarySchema = z.object({
   date: z.union([z.date(), z.string()]).optional().transform(val => val ? (typeof val === 'string' ? new Date(val) : val) : undefined).describe('Publication or creation date'),
   tags: z.union([z.array(z.string()), z.null()]).default([]).transform(val => val || []).describe('Tags for categorization'),
   title: z.string().optional().describe('Page title (defaults to filename)'),
-  lang: z.enum(['zh', 'en']).optional().describe('Language (inferred from path or frontmatter)'),
+  title_en: z.string().optional().describe('Page title in English, for the sidebar'),
+  // Base notes are Chinese; an English body goes in a `<name>.en.md` sibling,
+  // which the `translations` collection picks up. This field is therefore
+  // almost never needed by hand — it stays for notes authored directly in
+  // English, which obsidian-links.js already honours when resolving wiki links.
+  lang: z.enum(['zh', 'en']).optional().describe('Language of this note (defaults to zh)'),
+  // Read by LibraryPage for the index cards. Previously these survived only
+  // because of .passthrough(), so nothing caught a typo like `descriptio:`.
+  description: z.string().optional().describe('Card summary on the library index'),
+  excerpt: z.string().optional().describe('Fallback for description'),
 }).passthrough(); // Allow additional fields that don't match schema
 
 /**
@@ -95,33 +222,184 @@ const publicationsSchema = z.object({
   authors: z.array(z.string()).describe('Author names'),
   venue: z.string().optional().describe('Publication venue (journal, conference, etc.)'),
   year: z.number().int().optional().describe('Publication year; absent when the entry has no parseable date'),
-  bib_key: z.string().optional().describe('BibTeX key for citation'),
+  bib_key: z.string().optional().describe('BibTeX key; the join key for sidecars and cross-references'),
   bibtex: z.string().optional().describe('Original BibTeX entry string'),
   doi: z.string().url().optional().describe('DOI URL'),
   pdf: z.string().optional().describe('PDF file path in attachments'),
-  tags: z.array(z.string()).default([]).describe('Research topic tags for filtering'),
+  // Re-declared with baseSchema's null tolerance restored. Spreading baseSchema
+  // and then overriding `tags` dropped it, so `tags: null` — which every other
+  // collection accepts — failed validation here alone.
+  tags: baseSchema.tags.describe('Research topic tags for filtering'),
+  /** Inferred from the BibTeX entry type (@article, @inproceedings, …). */
+  type: z
+    .enum(['journal', 'conference', 'preprint', 'chapter', 'book', 'thesis', 'other'])
+    .default('other')
+    .describe('Publication kind'),
+
+  // ---- Fields below come from a sidecar note, not from the .bib ----
+  // Zotero rewrites .bib files wholesale and drops non-standard fields, so
+  // anything the site adds has to live beside it. See PUBLICATION_SIDECAR_DIR.
+  featured: z.boolean().default(false).describe('Showcase on the home and research pages'),
+  order: z.number().optional().describe('Sort key among featured publications'),
+  cover: z.string().optional().describe('Figure or cover image under /attachments'),
+  highlight: z.string().optional().describe('One line on why this paper matters'),
+  highlight_en: z.string().optional(),
+  author_ids: z.array(z.string()).default([]).describe('Person ids for the lab authors'),
+  code: z.string().url().optional().describe('Repository implementing the paper'),
+  data: z.string().url().optional().describe('Dataset behind the paper'),
+  press: z
+    .array(
+      z.object({
+        outlet: z.string(),
+        outlet_en: z.string().optional(),
+        url: z.string().url(),
+        date: z.union([z.date(), z.string()]).optional(),
+      })
+    )
+    .default([])
+    .describe('Media coverage'),
+});
+
+/**
+ * Sidecar note enriching one BibTeX entry.
+ * Maps from: .content/Team-Guidebook/图书馆/文献/精选/<bib_key>.md
+ *
+ * Validated as its own collection so a malformed sidecar names its own file in
+ * the error, rather than surfacing as a confusing failure inside the
+ * publications loader. The loader reads the same files and merges them.
+ */
+const publicationHighlightSchema = z.object({
+  publish: baseSchema.publish,
+  bib_key: z.string().describe('Citation key of the entry this enriches'),
+  featured: z.boolean().default(true),
+  order: z.number().optional(),
+  cover: z.string().optional(),
+  highlight: z.string().optional(),
+  highlight_en: z.string().optional(),
+  author_ids: z.array(z.string()).default([]),
+  code: z.string().url().optional(),
+  data: z.string().url().optional(),
+  type: z.enum(['journal', 'conference', 'preprint', 'chapter', 'book', 'thesis', 'other']).optional(),
+  press: z
+    .array(
+      z.object({
+        outlet: z.string(),
+        outlet_en: z.string().optional(),
+        url: z.string().url(),
+        date: z.union([z.date(), z.string()]).optional(),
+      })
+    )
+    .default([]),
+});
+
+/**
+ * Site identity, navigation and social links.
+ * Maps from: <vault root>/site.md — a single entry, id `site`.
+ *
+ * Before this the site had three different identities hardcoded in three
+ * components: Header.astro said "Our Lab" / "实验室", Footer.astro said
+ * "Lab Website", and HomePage.tsx said "SongshGeo Lab" with an institute name
+ * and hero copy. Nothing reconciled them, and a content maintainer could not
+ * change any of them without a code change and a redeploy.
+ *
+ * The body of site.md is the About page lead, which is why this is a markdown
+ * file rather than YAML — it needs `render()`, and an Obsidian author can open
+ * and preview it like any other note.
+ */
+const siteSchema = z.object({
+  name: z.string().describe('Lab name, in the primary (Chinese) language'),
+  name_en: z.string().optional().describe('Lab name in English'),
+  tagline: z.string().optional().describe('One-line description'),
+  tagline_en: z.string().optional(),
+  // The hero renders the headline over two lines, the second in the accent
+  // gradient. Kept as two fields because that is what the layout needs; a
+  // single string would have to be split on a marker somewhere.
+  headline: z.string().optional().describe('First line of the hero headline'),
+  headline_en: z.string().optional(),
+  headline_accent: z.string().optional().describe('Second, highlighted hero line'),
+  headline_accent_en: z.string().optional(),
+  affiliation: z.string().optional().describe('Institute or university'),
+  affiliation_en: z.string().optional(),
+  logo: z.string().optional().describe('Path under /attachments'),
+  email: z.string().email().optional(),
+  address: z.string().optional(),
+  address_en: z.string().optional(),
+  socials: z
+    .array(
+      z.object({
+        label: z.string(),
+        url: z.string().url(),
+        icon: z.string().optional().describe('lucide-react icon name'),
+      })
+    )
+    .default([]),
+  /**
+   * Optional nav override.
+   *
+   * Left optional on purpose: nav entries point at routes, and routes are code.
+   * A content author who adds an item here for a page that does not exist ships
+   * a 404 with no build error. When absent, Header.astro uses the route list it
+   * can actually verify, with labels from src/i18n/ui.ts.
+   */
+  nav: z
+    .array(
+      z.object({
+        href: z.string(),
+        label: z.string(),
+        label_en: z.string().optional(),
+      })
+    )
+    .optional(),
+  footer_note: z.string().optional(),
+  footer_note_en: z.string().optional(),
 });
 
 /**
  * Define all content collections.
- * 
- * Note: Content Collections will read from src/content/{collection}/ directories,
- * which are symlinked to .content/Team-Guidebook/ via setup-content.mjs.
- * 
- * For News collection: A custom loader is required to extract bullet items from Daily Notes.
- * This will be implemented in a separate loader file (see src/content/loaders/news.ts).
- * 
- * For Library collection: The symlink points to 图书馆/, but we need to exclude
- * 项目/ and 文献/ subdirectories. This is handled by filtering in the loader or
- * by using a more specific symlink structure.
+ *
+ * Most read from src/content/{collection}/, which scripts/setup-content.mjs
+ * symlinks into the Obsidian vault. `news` and `publications` bypass the
+ * symlinks and read the vault directly through custom loaders; `site` and
+ * `translations` glob the vault root, because they are not one directory.
  */
 export const collections = {
+  site: defineCollection({
+    // Globbed straight from the vault root rather than through a symlink under
+    // src/content/: setup-content.mjs links directories, and this is one file.
+    // A null root (fresh clone, content not synced) yields no entries and the
+    // consumers fall back to their defaults — see findContentRoot.
+    loader: glob({ pattern: 'site.md', base: findContentRoot() ?? './.content' }),
+    schema: siteSchema,
+  }),
+  /**
+   * English (and other non-base) bodies: `<name>.en.md` beside their base note.
+   *
+   * Globbed from the vault root so one collection covers every other one; ids
+   * are vault-relative paths (`通讯录/song-shuang.en`), which
+   * `translationIndex()` maps back onto base ids.
+   */
+  translations: defineCollection({
+    loader: glob({
+      pattern: CONTENT_LOCALES.map((locale) => `**/*.${locale}.md`),
+      base: findContentRoot() ?? './.content',
+      generateId: keepPathAsId,
+    }),
+    schema: translationSchema,
+  }),
   people: defineCollection({
-    loader: glob({ pattern: '**/*.md', base: './src/content/people', generateId: keepPathAsId }),
+    loader: glob({
+      pattern: ['**/*.md', ...TRANSLATION_GLOBS],
+      base: './src/content/people',
+      generateId: keepPathAsId,
+    }),
     schema: peopleSchema,
   }),
   projects: defineCollection({
-    loader: glob({ pattern: '**/*.md', base: './src/content/projects', generateId: keepPathAsId }),
+    loader: glob({
+      pattern: ['**/*.md', ...TRANSLATION_GLOBS],
+      base: './src/content/projects',
+      generateId: keepPathAsId,
+    }),
     schema: projectsSchema,
   }),
   news: defineCollection({
@@ -133,21 +411,47 @@ export const collections = {
     // Excluded here as well as in getLibraryEntries(), so a stray consumer
     // cannot resurface them.
     loader: glob({
-      pattern: ['**/*.md', ...OWNED_BY_OTHER_COLLECTIONS_GLOBS],
+      pattern: ['**/*.md', ...OWNED_BY_OTHER_COLLECTIONS_GLOBS, ...TRANSLATION_GLOBS],
       base: './src/content/library',
       generateId: keepPathAsId
     }),
     schema: librarySchema,
-    // Note: Library symlink points to 图书馆/, which includes 项目/ and 文献/
-    // We need to filter these out. This can be done via:
-    // 1. Custom loader that filters paths
-    // 2. More specific symlink structure (separate symlinks for each subdirectory)
-    // For now, we'll rely on the fact that 项目/ and 文献/ have their own collections
-    // and can be filtered at query time if needed.
+  }),
+  research: defineCollection({
+    loader: glob({
+      pattern: ['**/*.md', ...TRANSLATION_GLOBS],
+      base: './src/content/library/研究',
+      generateId: keepPathAsId,
+    }),
+    schema: researchSchema,
+  }),
+  resources: defineCollection({
+    loader: glob({
+      pattern: ['**/*.md', ...TRANSLATION_GLOBS],
+      base: './src/content/library/资源',
+      generateId: keepPathAsId,
+    }),
+    schema: resourcesSchema,
   }),
   publications: defineCollection({
+    // Reads the .bib files AND merges the sidecars from 文献/精选/.
     loader: publicationsLoader(),
     schema: publicationsSchema,
   }),
+  /**
+   * The sidecars again, as their own collection.
+   *
+   * Redundant with the merge inside publicationsLoader, and deliberately so:
+   * this is what validates them. A typo in a sidecar reports as an error
+   * naming that file, instead of silently failing to enrich a paper.
+   */
+  publicationHighlights: defineCollection({
+    loader: glob({
+      pattern: ['**/*.md', ...TRANSLATION_GLOBS],
+      base: './src/content/library/文献/精选',
+      generateId: keepPathAsId,
+    }),
+    schema: publicationHighlightSchema,
+  }),
 };
 
diff --git a/src/content/loaders/newsLoader.ts b/src/content/loaders/newsLoader.ts
index 0dee694..11c23ad 100644
--- a/src/content/loaders/newsLoader.ts
+++ b/src/content/loaders/newsLoader.ts
@@ -6,6 +6,7 @@ import { entrySlug } from '../../utils/entrySlug';
 import { parseCalendarDate } from '../../utils/formatDate';
 import fg from 'fast-glob';
 import { renderMarkdown } from '../../utils/render-markdown.js';
+import { getContentRoot, VAULT_DIRS } from '../../utils/contentLayout.js';
 
 // Define the shape of the news item
 // Must match the schema in config.ts (minus the Zod transformation, or pre-transformation)
@@ -19,33 +20,9 @@ interface NewsItem {
   publish: boolean;
 }
 
-// Helper to resolve the content root
-function getContentRoot() {
-  const cwd = process.cwd();
-  // Check .content/Team-Guidebook
-  const contentInDotContent = path.join(cwd, '.content', 'Team-Guidebook');
-  if (fs.existsSync(contentInDotContent)) {
-    return contentInDotContent;
-  }
-  // Check .content directly (if it is Team-Guidebook)
-  const dotContent = path.join(cwd, '.content');
-  if (fs.existsSync(dotContent)) {
-    // Check if it looks like Team-Guidebook (has 档案馆, etc)
-    if (fs.existsSync(path.join(dotContent, '档案馆'))) {
-      return dotContent;
-    }
-  }
-  // Fallback to local Team-Guidebook
-  const local = path.join(cwd, 'Team-Guidebook');
-  if (fs.existsSync(local)) {
-    return local;
-  }
-  throw new Error('Content root not found. Please run npm run setup:content');
-}
-
 // Helper to load people aliases -> id map
 function loadPeopleMap(contentRoot: string): Record<string, string> {
-  const peopleDir = path.join(contentRoot, '通讯录');
+  const peopleDir = path.join(contentRoot, VAULT_DIRS.people);
   if (!fs.existsSync(peopleDir)) return {};
 
   const files = fg.globSync('*.md', { cwd: peopleDir });
@@ -74,8 +51,8 @@ export function newsLoader(): Loader {
   return {
     name: 'news-loader',
     load: async (context: LoaderContext) => {
-      const contentRoot = getContentRoot();
-      const newsDir = path.join(contentRoot, '档案馆');
+      const contentRoot = getContentRoot(VAULT_DIRS.news);
+      const newsDir = path.join(contentRoot, VAULT_DIRS.news);
 
       const loadAll = async () => {
       // Astro persists the store across runs (.astro/ and node_modules/.astro).
@@ -178,19 +155,24 @@ export function newsLoader(): Loader {
               ? date.toISOString().split('T')[0]
               : path.basename(file, '.md');
 
+            // Typed against NewsItem so the payload cannot drift from the
+            // schema in content.config.ts unnoticed — store.set() takes
+            // `Record<string, unknown>` and would swallow a renamed field.
+            const newsData: Omit<NewsItem, 'id'> = {
+              date,
+              title,
+              content: html,
+              related_people: [...new Set(relatedPeople)], // Deduplicate
+              tags: [...new Set(tags)],
+              publish: true
+            };
+
             context.store.set({
               id,
               // Recorded for change detection by consumers; note this loader
               // clears the store each run, so it cannot skip work by itself.
               digest: context.generateDigest?.(JSON.stringify({ bulletContent, date, file })),
-              data: {
-                date,
-                title,
-                content: html,
-                related_people: [...new Set(relatedPeople)], // Deduplicate
-                tags: [...new Set(tags)],
-                publish: true
-              }
+              data: newsData
             });
           }
         }
diff --git a/src/content/loaders/publicationsLoader.ts b/src/content/loaders/publicationsLoader.ts
index ea83396..124d819 100644
--- a/src/content/loaders/publicationsLoader.ts
+++ b/src/content/loaders/publicationsLoader.ts
@@ -4,6 +4,12 @@ import path from 'node:path';
 import fg from 'fast-glob';
 import { createRequire } from 'node:module';
 import { createHash } from 'node:crypto';
+import matter from 'gray-matter';
+import {
+  getContentRoot,
+  VAULT_DIRS,
+  PUBLICATION_SIDECAR_DIR,
+} from '../../utils/contentLayout.js';
 
 // Use createRequire to load CommonJS modules robustly in all environments
 const require = createRequire(import.meta.url);
@@ -28,36 +34,111 @@ interface PublicationItem {
 /** Zotero writes these into `keywords`; they are not research topics. */
 const LANGUAGE_KEYWORDS = new Set(['english', 'chinese', '中文', '英文']);
 
-// Helper to resolve the content root (same as newsLoader)
-function getContentRoot() {
-  const cwd = process.cwd();
-  // Check .content/Team-Guidebook
-  const contentInDotContent = path.join(cwd, '.content', 'Team-Guidebook');
-  if (fs.existsSync(contentInDotContent)) {
-    return contentInDotContent;
-  }
-  // Check .content directly (if it is Team-Guidebook)
-  const dotContent = path.join(cwd, '.content');
-  if (fs.existsSync(dotContent)) {
-    // Check if it looks like Team-Guidebook (has 图书馆, etc)
-    if (fs.existsSync(path.join(dotContent, '图书馆'))) {
-      return dotContent;
+/** What each BibTeX entry type means as a publication kind. */
+const TYPE_BY_BIBTEX_TYPE: Record<string, PublicationType> = {
+  article: 'journal',
+  inproceedings: 'conference',
+  conference: 'conference',
+  proceedings: 'conference',
+  incollection: 'chapter',
+  inbook: 'chapter',
+  book: 'book',
+  phdthesis: 'thesis',
+  mastersthesis: 'thesis',
+  // @misc is what Zotero writes for a preprint, and preprints are the entries a
+  // reader most needs distinguished from peer-reviewed work.
+  misc: 'preprint',
+  unpublished: 'preprint',
+};
+
+export type PublicationType =
+  | 'journal'
+  | 'conference'
+  | 'preprint'
+  | 'chapter'
+  | 'book'
+  | 'thesis'
+  | 'other';
+
+/**
+ * Read the entry type out of the raw BibTeX text.
+ *
+ * citation-js normalises `type` onto CSL names that collapse distinctions we
+ * want (both @article and @misc can arrive as 'article-journal'), so take it
+ * from the `@type{` token that `extractBibEntries` preserved verbatim.
+ */
+export function inferPublicationType(originalBibtex: string | undefined): PublicationType {
+  const match = /^\s*@(\w+)\s*\{/m.exec(originalBibtex ?? '');
+  if (!match) return 'other';
+  return TYPE_BY_BIBTEX_TYPE[match[1].toLowerCase()] ?? 'other';
+}
+
+/** Fields a sidecar note may contribute to a publication. */
+export interface PublicationSidecar {
+  bib_key: string;
+  featured?: boolean;
+  order?: number;
+  cover?: string;
+  highlight?: string;
+  highlight_en?: string;
+  author_ids?: string[];
+  code?: string;
+  data?: string;
+  type?: PublicationType;
+  press?: Array<{ outlet: string; outlet_en?: string; url: string; date?: string | Date }>;
+}
+
+/**
+ * Read the sidecar notes that enrich individual BibTeX entries.
+ *
+ * A `.bib` file is regenerated wholesale by Zotero, which drops any field it
+ * does not recognise — so a cover image or a one-line highlight written into
+ * the .bib would survive exactly until the next export. They live in
+ * `文献/精选/<bib_key>.md` instead and are joined here on the citation key.
+ *
+ * @param warn called with an actionable message for each sidecar that matches
+ *   no entry — silence would leave an author wondering why their highlight
+ *   never appeared.
+ */
+export function loadSidecars(
+  dir: string,
+  knownKeys: Set<string>,
+  warn: (message: string) => void = () => {}
+): Map<string, PublicationSidecar> {
+  const sidecars = new Map<string, PublicationSidecar>();
+  if (!fs.existsSync(dir)) return sidecars;
+
+  for (const file of fg.globSync('**/*.md', { cwd: dir })) {
+    const { data } = matter(fs.readFileSync(path.join(dir, file), 'utf-8'));
+    if (data.publish === false) continue;
+
+    // Default the key to the filename: naming the file after the citation key
+    // is the obvious convention, and repeating it in frontmatter is a second
+    // place to get it wrong.
+    const bibKey = String(data.bib_key ?? path.basename(file, '.md')).trim();
+    if (!bibKey) continue;
+
+    if (!knownKeys.has(bibKey)) {
+      warn(
+        `[publications] sidecar ${file} references bib_key "${bibKey}", which no ` +
+          `.bib entry defines — the highlight will not appear on any publication`
+      );
+      continue;
     }
+    sidecars.set(bibKey, { ...(data as PublicationSidecar), bib_key: bibKey });
   }
-  // Fallback to local Team-Guidebook
-  const local = path.join(cwd, 'Team-Guidebook');
-  if (fs.existsSync(local)) {
-    return local;
-  }
-  throw new Error('Content root not found. Please run npm run setup:content');
+  return sidecars;
 }
 
 /**
  * Extract individual BibTeX entries from a BibTeX file.
  * Returns a map of citation key -> BibTeX string.
  * Handles multi-line entries and nested braces.
+ *
+ * Exported for testing: this is a hand-rolled scanner, and the bugs it has had
+ * (silently corrupting entries) were only ever caught by eye on the built site.
  */
-function extractBibEntries(bibContent: string): Record<string, string> {
+export function extractBibEntries(bibContent: string): Record<string, string> {
   const entries: Record<string, string> = {};
   
   // Match BibTeX entries: @type{key, ...}
@@ -115,8 +196,12 @@ function extractBibEntries(bibContent: string): Record<string, string> {
  * @param entry - Citation-js entry object
  * @param bibKey - BibTeX citation key
  * @param originalBibtex - Original BibTeX string for this entry (optional)
+ *
+ * Exported for testing. Every field mapping below encodes a bug that reached
+ * production once (`keyword` vs `keywords`, local `file=` paths, the missing
+ * year falling back to "now"); the tests pin each one.
  */
-function parseBibEntry(
+export function parseBibEntry(
   entry: any,
   bibKey: string,
   originalBibtex?: string,
@@ -234,7 +319,7 @@ export function publicationsLoader(): Loader {
   return {
     name: 'publications-loader',
     load: async (context: LoaderContext) => {
-      const contentRoot = getContentRoot();
+      const contentRoot = getContentRoot(VAULT_DIRS.library);
 
       const loadAll = async () => {
       // Same reasoning as newsLoader: full rebuild each run, so clear first.
@@ -242,10 +327,12 @@ export function publicationsLoader(): Loader {
       // page indefinitely.
       context.store.clear();
 
-      
+      /** Every entry across every .bib, before the sidecar merge. */
+      const parsed: Array<PublicationItem & { type: PublicationType }> = [];
+
       // Try 图书馆/文献/ first, then fallback to 图书馆/ root
-      const publicationsDir = path.join(contentRoot, '图书馆', '文献');
-      const libraryRoot = path.join(contentRoot, '图书馆');
+      const publicationsDir = path.join(contentRoot, VAULT_DIRS.library, '文献');
+      const libraryRoot = path.join(contentRoot, VAULT_DIRS.library);
       
       let searchDir = publicationsDir;
       let bibFiles: string[] = [];
@@ -349,23 +436,14 @@ export function publicationsLoader(): Loader {
               context.logger.warn(m)
             );
 
+            // Collected rather than stored immediately: the sidecar join below
+            // needs the full set of citation keys, so that a sidecar naming a
+            // key defined in a *different* .bib file still resolves, and so an
+            // unmatched one can be reported rather than silently ignored.
             if (publication) {
-              context.store.set({
-                digest: context.generateDigest?.(JSON.stringify(publication)),
-                id: publication.id,
-                data: {
-                  title: publication.title,
-                  authors: publication.authors,
-                  venue: publication.venue,
-                  year: publication.year,
-                  bib_key: publication.bib_key,
-                  bibtex: publication.bibtex,
-                  doi: publication.doi,
-                  pdf: publication.pdf,
-                  tags: publication.tags,
-                  publish: publication.publish,
-                  date: publication.date,
-                }
+              parsed.push({
+                ...publication,
+                type: inferPublicationType(bibtexString),
               });
             }
           }
@@ -376,6 +454,47 @@ export function publicationsLoader(): Loader {
           // Continue processing other files
         }
       }
+
+      const sidecars = loadSidecars(
+        path.join(searchDir, PUBLICATION_SIDECAR_DIR),
+        new Set(parsed.map((p) => p.id)),
+        (m) => context.logger.warn(m)
+      );
+
+      for (const publication of parsed) {
+        const extra = sidecars.get(publication.id);
+        const data = {
+          title: publication.title,
+          authors: publication.authors,
+          venue: publication.venue,
+          year: publication.year,
+          bib_key: publication.bib_key,
+          bibtex: publication.bibtex,
+          doi: publication.doi,
+          pdf: publication.pdf,
+          tags: publication.tags,
+          publish: publication.publish,
+          date: publication.date,
+          // The sidecar may correct an inferred type — @misc covers both a
+          // preprint and a dataset, and only a human can tell them apart.
+          type: extra?.type ?? publication.type,
+          featured: extra?.featured ?? false,
+          order: extra?.order,
+          cover: extra?.cover,
+          highlight: extra?.highlight,
+          highlight_en: extra?.highlight_en,
+          author_ids: extra?.author_ids ?? [],
+          code: extra?.code,
+          data: extra?.data,
+          press: extra?.press ?? [],
+        };
+
+        context.store.set({
+          digest: context.generateDigest?.(JSON.stringify(data)),
+          id: publication.id,
+          data,
+        });
+      }
       };
 
       await loadAll();
@@ -386,7 +505,7 @@ export function publicationsLoader(): Loader {
       // fixture daily note with the server up leaves the page unchanged.
       // The hook is kept because the loader is now re-entrant, which is the
       // prerequisite for fixing this properly.
-      const bibRoot = path.join(contentRoot, '图书馆');
+      const bibRoot = path.join(contentRoot, VAULT_DIRS.library);
       context.watcher?.add(bibRoot);
       for (const event of ['change', 'add', 'unlink'] as const) {
         context.watcher?.on(event, (changedPath: string) => {
diff --git a/src/i18n/ui.ts b/src/i18n/ui.ts
index 38a4225..6dc94fa 100644
--- a/src/i18n/ui.ts
+++ b/src/i18n/ui.ts
@@ -17,6 +17,31 @@ export const DEFAULT_LOCALE: Lang = 'en';
 type Dict = Record<Lang, string>;
 
 export const ui = {
+  /**
+   * Header navigation labels.
+   *
+   * Only the labels live here. The hrefs stay in Header.astro, next to the
+   * routes they have to match — a label is a translation, a route is a fact
+   * about what got built, and mixing them is how a nav item outlives its page.
+   */
+  nav: {
+    home: { zh: '首页', en: 'Home' } satisfies Dict,
+    research: { zh: '研究', en: 'Research' } satisfies Dict,
+    news: { zh: '动态', en: 'News' } satisfies Dict,
+    projects: { zh: '项目', en: 'Projects' } satisfies Dict,
+    resources: { zh: '资源', en: 'Resources' } satisfies Dict,
+    library: { zh: '图书馆', en: 'Library' } satisfies Dict,
+    publications: { zh: '出版物', en: 'Publications' } satisfies Dict,
+    people: { zh: '团队', en: 'People' } satisfies Dict,
+    about: { zh: '关于', en: 'About' } satisfies Dict
+  },
+  /** Strings belonging to the page shell rather than to any one page. */
+  shell: {
+    mainNav: { zh: '主导航', en: 'Main navigation' } satisfies Dict,
+    search: { zh: '搜索', en: 'Search' } satisfies Dict,
+    skipToContent: { zh: '跳到主要内容', en: 'Skip to main content' } satisfies Dict,
+    rightsReserved: { zh: '保留所有权利。', en: 'All rights reserved.' } satisfies Dict
+  },
   home: {
     title: { zh: '实验室主页', en: 'Lab Home' } satisfies Dict,
     description: {
@@ -32,6 +57,41 @@ export const ui = {
     title: { zh: '研究项目', en: 'Projects' } satisfies Dict,
     description: { zh: '实验室研究项目', en: 'Lab research projects' } satisfies Dict
   },
+  research: {
+    title: { zh: '研究方向', en: 'Research' } satisfies Dict,
+    description: {
+      zh: '我们长期关注的研究主题',
+      en: 'The questions the group works on'
+    } satisfies Dict,
+    empty: {
+      zh: '尚未添加研究方向。',
+      en: 'No research themes have been added yet.'
+    } satisfies Dict,
+    people: { zh: '相关成员', en: 'People' } satisfies Dict,
+    publications: { zh: '代表论文', en: 'Selected Publications' } satisfies Dict,
+    projects: { zh: '相关项目', en: 'Related Projects' } satisfies Dict
+  },
+  resources: {
+    title: { zh: '数据与工具', en: 'Resources' } satisfies Dict,
+    description: {
+      zh: '实验室对外发布的数据集、代码与模型',
+      en: 'Datasets, code and models the group publishes'
+    } satisfies Dict,
+    empty: {
+      zh: '尚未发布资源。',
+      en: 'No resources have been published yet.'
+    } satisfies Dict,
+    license: { zh: '许可协议', en: 'Licence' } satisfies Dict,
+    released: { zh: '发布时间', en: 'Released' } satisfies Dict
+  },
+  /** Labels for the `type` enum on the resources collection. */
+  resourceTypes: {
+    dataset: { zh: '数据集', en: 'Dataset' } satisfies Dict,
+    code: { zh: '代码', en: 'Code' } satisfies Dict,
+    model: { zh: '模型', en: 'Model' } satisfies Dict,
+    tool: { zh: '工具', en: 'Tool' } satisfies Dict,
+    course: { zh: '课程', en: 'Course' } satisfies Dict
+  },
   publications: {
     title: { zh: '论文发表', en: 'Publications' } satisfies Dict,
     description: { zh: '实验室论文发表列表', en: 'Lab publications' } satisfies Dict
@@ -82,6 +142,21 @@ export const ui = {
   person: {
     email: { zh: '邮箱：', en: 'Email: ' } satisfies Dict,
     links: { zh: '链接：', en: 'Links: ' } satisfies Dict,
-    interests: { zh: '研究兴趣：', en: 'Research Interests: ' } satisfies Dict
+    interests: { zh: '研究兴趣：', en: 'Research Interests: ' } satisfies Dict,
+    destination: { zh: '现任：', en: 'Now at: ' } satisfies Dict
+  },
+  i18n: {
+    /**
+     * Shown when a page falls back to the base language.
+     *
+     * Saying so is the point. `/zh` and `/en` used to serve byte-identical
+     * Chinese bodies with nothing to indicate it, so an English-speaking reader
+     * had no way to tell a missing translation from a page that simply had no
+     * more to say.
+     */
+    fallbackNotice: {
+      zh: '本页尚无其他语言版本，以下为中文原文。',
+      en: 'This page has not been translated yet; the original Chinese text follows.'
+    } satisfies Dict
   }
 } as const;
diff --git a/src/layouts/BaseLayout.astro b/src/layouts/BaseLayout.astro
index 2f7e5ce..cf4a9f0 100644
--- a/src/layouts/BaseLayout.astro
+++ b/src/layouts/BaseLayout.astro
@@ -3,7 +3,7 @@ import '../styles/global.css';
 import Header from '../components/Header.astro';
 import RippleBackground from '../components/react/RippleBackground.tsx';
 import Footer from '../components/Footer.astro';
-import { LOCALES, DEFAULT_LOCALE } from '../i18n/ui';
+import { LOCALES, DEFAULT_LOCALE, ui, type Lang } from '../i18n/ui';
 
 interface Props {
   title: string;
@@ -17,14 +17,20 @@ interface Props {
   noIndex?: boolean;
 }
 
-const { title, description = "Lab Website", lang = "zh", noIndex = false } = Astro.props;
+const { title, description = 'Lab Website', lang: rawLang = 'zh', noIndex = false } = Astro.props;
+
+// Narrow to Lang once, here. `lang` arrives as a plain string because .astro
+// props are loosely typed at the boundary, but everything downstream indexes
+// the ui dictionary with it.
+const lang: Lang = LOCALES.includes(rawLang as Lang) ? (rawLang as Lang) : DEFAULT_LOCALE;
 
 // LOCALES / DEFAULT_LOCALE come from the i18n module so the locale set has one
 // definition; redeclaring them here is how the two drift apart.
 
-// `/zh/library/x` and `/en/library/x` are the same document in two locales.
-// Without canonical + hreflang, search engines see pure duplicate content —
-// the two trees currently render identical text (see issue #11).
+// `/zh/library/x` and `/en/library/x` are the same document in two locales,
+// so they need canonical + hreflang. Bodies now genuinely differ wherever a
+// `.en.md` overlay exists, and fall back to the Chinese with a notice where
+// one does not — so these tags describe translations, not duplicate content.
 const currentPath = Astro.url.pathname;
 const pathWithoutLocale = currentPath.replace(/^\/(zh|en)(?=\/|$)/, '') || '/';
 const localeUrl = (locale: string) =>
@@ -37,9 +43,17 @@ const alternates = Astro.site && !noIndex
 ---
 
 <!doctype html>
-<html lang={lang}>
+<!--
+  class="dark" is unconditional, and paired with the color-scheme meta below.
+  The backdrop is a dark photograph on every page regardless of the reader's OS
+  setting, so the dark half of every `dark:` pair must always win — see the note
+  on @custom-variant in src/styles/global.css. color-scheme tells the browser to
+  match form controls, scrollbars and the like.
+-->
+<html lang={lang} class="dark">
   <head>
     <meta charset="UTF-8" />
+    <meta name="color-scheme" content="dark" />
     <meta name="description" content={description} />
     <!-- initial-scale=1 stops iOS zooming the page on load -->
     <meta name="viewport" content="width=device-width, initial-scale=1" />
@@ -77,14 +91,82 @@ const alternates = Astro.site && !noIndex
   -->
   <body class="bg-white dark:bg-slate-900 text-slate-900 dark:text-white min-h-screen flex flex-col overflow-x-hidden">
     <!--
-      Decorative only, and the heaviest bundle in the tree (three + fiber + drei).
-      client:load blocked on it during initial hydration on all 29 pages; it has
-      nothing to do with interactivity, so let it wait for an idle moment.
+      Static backdrop, rendered on the server on every page. It is what a
+      reader sees when the WebGL island never mounts — reduced motion, no
+      WebGL, or JS off — and it is behind the canvas otherwise, so there is no
+      flash of black before the texture loads.
     -->
-    <RippleBackground client:idle />
+    <div class="fixed inset-0 -z-30 bg-black" aria-hidden="true">
+      <img
+        src="/background.jpg"
+        alt=""
+        class="h-full w-full object-cover"
+        fetchpriority="low"
+        decoding="async"
+      />
+    </div>
+
+    <!--
+      Decorative only, and by far the heaviest bundle in the tree: three +
+      fiber + drei build an 888 KB chunk (228 KB gzipped), about two thirds of
+      all the JS this site ships, on every page.
+
+      client:media, not client:idle. client:idle took it off the hydration
+      critical path but NOT out of the download — a reader who has asked for
+      reduced motion still fetched all of it, initialised a WebGL context and
+      allocated two framebuffers, only for the component to freeze its own
+      animation from the inside. Gating at the mount boundary means the chunk
+      is never requested at all, which is the request such a reader is
+      actually making, and which is most valuable on exactly the low-power
+      devices where that preference tends to be set.
+
+      The component keeps its own prefers-reduced-motion listener: this gate is
+      evaluated once at mount, so a reader who changes the setting mid-session
+      still needs the in-component check to stop the animation.
+    -->
+    <RippleBackground client:media="(prefers-reduced-motion: no-preference)" />
+
+    <!--
+      The tint over whichever backdrop is showing — the static image, or the
+      canvas once it mounts. It lives HERE, exactly once, and deliberately not
+      inside either of them.
+
+      It used to be inside RippleBackground; adding the static backdrop copied
+      it, and two 80%-opaque layers composite to 96%, not 80%. The page went
+      visibly murky and the header text stopped being legible against it.
+      Anything painting a full-viewport tint has to be a single element.
+    -->
+    <div
+      class="pointer-events-none fixed inset-0 -z-10 bg-gradient-to-b from-[#08152dcc] via-[#050b14cc] to-[#02040acc]"
+      aria-hidden="true"
+    >
+    </div>
+    <!--
+      Skip link. The header carries nine nav items plus a search icon and two
+      language toggles, so a keyboard or screen-reader user otherwise tabs
+      through twelve controls on every single page before reaching the content.
+      Visually hidden until focused.
+    -->
+    <a
+      href="#main"
+      class="sr-only focus:not-sr-only focus:absolute focus:left-4 focus:top-4 focus:z-50 focus:rounded focus:bg-white focus:px-4 focus:py-2 focus:text-slate-900 focus:outline-2 focus:outline-offset-2 focus:outline-teal-500"
+    >
+      {ui.shell.skipToContent[lang]}
+    </a>
+
     <div class="relative z-10 flex flex-col min-h-screen">
       <Header />
-      <main class="flex-grow container mx-auto px-4 py-8">
+      <!--
+        data-pagefind-body confines the search index to page content. Without
+        it Pagefind indexed the whole <body>, so the nine nav labels, the
+        footer and the language switcher were in every record and a search for
+        "Library" matched all 36 pages instead of the library.
+
+        The equivalent `root_selector` in pagefind.yml is NOT a substitute —
+        it was tried, and Pagefind still reported "Did not find a
+        data-pagefind-body element ... Indexing all <body> elements".
+      -->
+      <main id="main" data-pagefind-body class="flex-grow container mx-auto px-4 py-8">
         <slot />
       </main>
       <Footer />
diff --git a/src/pages/[lang]/about/index.astro b/src/pages/[lang]/about/index.astro
index d797746..f33e357 100644
--- a/src/pages/[lang]/about/index.astro
+++ b/src/pages/[lang]/about/index.astro
@@ -1,5 +1,7 @@
 ---
+import { getEntry, render } from 'astro:content';
 import BaseLayout from '../../../layouts/BaseLayout.astro';
+import { getSiteConfig } from '../../../utils/siteConfig';
 import { LOCALES, ui, type Lang } from '../../../i18n/ui';
 
 export function getStaticPaths() {
@@ -7,12 +9,42 @@ export function getStaticPaths() {
 }
 
 const lang = Astro.params.lang as Lang;
+const site = await getSiteConfig(lang);
+
+// The body of the vault's site.md is the About copy. This page used to be a
+// hardcoded placeholder that said the content was "to be configured later" —
+// which no content maintainer could ever configure, because it was in code.
+const siteEntry = await getEntry('site', 'site');
+const Body = siteEntry ? (await render(siteEntry)).Content : undefined;
 ---
 
-<BaseLayout title={ui.about.title[lang]} description={ui.about.description[lang]} lang={lang}>
+<BaseLayout title={ui.about.title[lang]} description={site.tagline ?? ui.about.description[lang]} lang={lang}>
   <div class="prose dark:prose-invert max-w-none">
-    <h1>{ui.about.heading[lang]}</h1>
-    <p class="lead">{ui.about.lead[lang]}</p>
-    <p class="text-sm text-gray-500 dark:text-gray-400">{ui.about.note[lang]}</p>
+    <h1>{site.name}</h1>
+    {site.tagline && <p class="lead">{site.tagline}</p>}
+
+    {
+      Body ? (
+        <Body />
+      ) : (
+        <p class="text-sm text-gray-500 dark:text-gray-400">{ui.about.note[lang]}</p>
+      )
+    }
+
+    {
+      (site.email || site.address) && (
+        <dl class="not-prose mt-8 space-y-1 text-sm text-gray-600 dark:text-gray-300">
+          {site.affiliation && <dd>{site.affiliation}</dd>}
+          {site.address && <dd>{site.address}</dd>}
+          {site.email && (
+            <dd>
+              <a href={`mailto:${site.email}`} class="hover:underline">
+                {site.email}
+              </a>
+            </dd>
+          )}
+        </dl>
+      )
+    }
   </div>
 </BaseLayout>
diff --git a/src/pages/[lang]/index.astro b/src/pages/[lang]/index.astro
index 7148de5..a52c788 100644
--- a/src/pages/[lang]/index.astro
+++ b/src/pages/[lang]/index.astro
@@ -3,6 +3,8 @@ import { getCollection } from 'astro:content';
 import BaseLayout from '../../layouts/BaseLayout.astro';
 import { HomePage } from '../../components/react/pages/HomePage';
 import { entrySlug } from '../../utils/entrySlug';
+import { getSiteConfig } from '../../utils/siteConfig';
+import { pickLocalized } from '../../utils/localized';
 import { LOCALES, ui, type Lang } from '../../i18n/ui';
 
 export function getStaticPaths() {
@@ -11,6 +13,8 @@ export function getStaticPaths() {
 
 const lang = Astro.params.lang as Lang;
 
+const site = await getSiteConfig(lang);
+
 const allNews = await getCollection('news', ({ data }) => data.publish !== false);
 const newsItems = allNews
   .sort((a, b) => {
@@ -28,20 +32,30 @@ const newsItems = allNews
   }));
 
 const allProjects = await getCollection('projects', ({ data }) => data.publish !== false);
-const featuredProjects = allProjects.slice(0, 3).map((project) => ({
-  id: entrySlug(project),
-  title: project.data.title,
-  tags: project.data.tags || [],
-  start_date: project.data.start_date
-    ? new Date(project.data.start_date).getFullYear().toString()
-    : undefined,
-  end_date: project.data.end_date
-    ? new Date(project.data.end_date).getFullYear().toString()
-    : undefined,
-  detailUrl: `/${lang}/projects/${entrySlug(project)}`
-}));
+
+// "Featured" used to mean `.slice(0, 3)` over an unsorted collection — i.e.
+// whatever order the filesystem returned, which nobody could influence from
+// the vault. It is now an explicit opt-in with an explicit order.
+const featuredProjects = allProjects
+  .filter((project) => project.data.featured)
+  .sort((a, b) => (a.data.order ?? Number.MAX_SAFE_INTEGER) - (b.data.order ?? Number.MAX_SAFE_INTEGER))
+  .slice(0, 3)
+  .map((project) => ({
+    id: entrySlug(project),
+    title: pickLocalized(project.data, 'title', lang) ?? project.data.title,
+    summary: pickLocalized(project.data, 'summary', lang),
+    cover: project.data.cover,
+    tags: project.data.tags || [],
+    start_date: project.data.start_date
+      ? new Date(project.data.start_date).getFullYear().toString()
+      : undefined,
+    end_date: project.data.end_date
+      ? new Date(project.data.end_date).getFullYear().toString()
+      : undefined,
+    detailUrl: `/${lang}/projects/${entrySlug(project)}`
+  }));
 ---
 
 <BaseLayout title={ui.home.title[lang]} description={ui.home.description[lang]} lang={lang}>
-  <HomePage client:load lang={lang} news={newsItems} projects={featuredProjects} />
+  <HomePage client:load lang={lang} news={newsItems} projects={featuredProjects} site={site} />
 </BaseLayout>
diff --git a/src/pages/[lang]/library/[...slug].astro b/src/pages/[lang]/library/[...slug].astro
index 484bb45..d4a1800 100644
--- a/src/pages/[lang]/library/[...slug].astro
+++ b/src/pages/[lang]/library/[...slug].astro
@@ -1,5 +1,5 @@
 ---
-import { getCollection , render } from 'astro:content';
+import { render } from 'astro:content';
 import { getLibraryEntries } from '../../../utils/libraryEntries';
 import BaseLayout from '../../../layouts/BaseLayout.astro';
 import { LOCALES, type Lang } from '../../../i18n/ui';
diff --git a/src/pages/[lang]/library/index.astro b/src/pages/[lang]/library/index.astro
index 8eae5dd..e6f958d 100644
--- a/src/pages/[lang]/library/index.astro
+++ b/src/pages/[lang]/library/index.astro
@@ -1,5 +1,4 @@
 ---
-import { getCollection } from 'astro:content';
 import { getLibraryEntries } from '../../../utils/libraryEntries';
 import BaseLayout from '../../../layouts/BaseLayout.astro';
 import { LibraryPage } from '../../../components/react/pages/LibraryPage';
diff --git a/src/pages/[lang]/news/index.astro b/src/pages/[lang]/news/index.astro
index 85f7860..c0939d6 100644
--- a/src/pages/[lang]/news/index.astro
+++ b/src/pages/[lang]/news/index.astro
@@ -32,10 +32,13 @@ const news = allNews
     content: item.data.content || '',
     tags: item.data.tags || [],
     related_people: item.data.related_people || [],
-    relatedPeople: (item.data.related_people || [])
-      .map((id: string) => peopleById.get(id))
-      .filter(Boolean)
-      .map((p: any) => ({ name: p.name, url: `/${lang}/people/${p.slug}` }))
+    // flatMap, not map+filter(Boolean)+map: `filter(Boolean)` does not narrow
+    // `T | undefined` away in TypeScript, which is the only reason this had to
+    // fall back to `any` and discard a type Astro already knows.
+    relatedPeople: (item.data.related_people || []).flatMap((id: string) => {
+      const person = peopleById.get(id);
+      return person ? [{ name: person.name, url: `/${lang}/people/${person.slug}` }] : [];
+    })
   }));
 
 // Get Giscus configuration
diff --git a/src/pages/[lang]/people/[slug].astro b/src/pages/[lang]/people/[slug].astro
index 2012e8b..1b7303f 100644
--- a/src/pages/[lang]/people/[slug].astro
+++ b/src/pages/[lang]/people/[slug].astro
@@ -1,43 +1,74 @@
 ---
-import { getCollection, getEntry , render } from 'astro:content';
+import { getCollection, render } from 'astro:content';
 import BaseLayout from '../../../layouts/BaseLayout.astro';
 import { LOCALES, ui, type Lang } from '../../../i18n/ui';
 import { entrySlug } from '../../../utils/entrySlug';
+import { pickLocalized, pickLocalizedList, translationIndex } from '../../../utils/localized';
+import { COLLECTION_VAULT_PATHS } from '../../../utils/contentLayout.js';
+import { ROLE_TITLES, normalizeRole } from '../../../utils/roles';
 
 export async function getStaticPaths() {
   const people = await getCollection('people', ({ data }) => data.publish !== false);
-  return LOCALES.flatMap((lang) =>
-    people.map((person) => ({
+  const translations = await getCollection('translations', ({ data }) => data.publish !== false);
+
+  return LOCALES.flatMap((lang) => {
+    // Built per locale: which body a page renders depends on the locale, so the
+    // pairing cannot be hoisted out of this loop.
+    const overlays = translationIndex(translations, COLLECTION_VAULT_PATHS.people, lang);
+    return people.map((person) => ({
       params: { lang, slug: entrySlug(person) },
-      props: { person },
-    }))
-  );
+      props: { person, overlay: overlays.get(person.id) },
+    }));
+  });
 }
 
 const lang = Astro.params.lang as Lang;
-const { person } = Astro.props;
-const { Content } = await render(person);
+const { person, overlay } = Astro.props;
+
+// The English body lives in a `<name>.en.md` sibling. When there is none the
+// reader gets the Chinese with a notice — never a blank page, which is what an
+// empty-state would have produced for most of the vault.
+const { Content } = await render(overlay ?? person);
+const isFallback = lang !== 'zh' && !overlay;
+
+const name = pickLocalized(person.data, 'name', lang) ?? person.data.name;
+const title = pickLocalized(person.data, 'title', lang) ?? ROLE_TITLES[normalizeRole(person.data.role)][lang];
+const destination = pickLocalized(person.data, 'destination', lang);
+const interests = pickLocalizedList(person.data, 'interests', lang);
+// '、' is a Chinese enumeration comma; an English list wants ', '.
+const interestSeparator = lang === 'zh' ? '、' : ', ';
 ---
 
-<BaseLayout title={person.data.name} description={`${person.data.name} - ${person.data.role}`} lang={lang}>
+<BaseLayout title={name} description={`${name} - ${title}`} lang={lang}>
   <article class="prose dark:prose-invert max-w-none">
     <div class="flex items-start gap-6 mb-8 pb-8 border-b border-gray-200 dark:border-gray-700">
       {person.data.avatar ? (
         <img
           src={person.data.avatar}
-          alt={person.data.name}
+          alt=""
+          width="128"
+          height="128"
+          loading="lazy"
+          decoding="async"
           class="w-32 h-32 rounded-full object-cover flex-shrink-0"
         />
       ) : (
-        <div class="w-32 h-32 rounded-full bg-gray-200 dark:bg-gray-700 flex items-center justify-center text-4xl text-gray-500 dark:text-gray-400 flex-shrink-0">
-          {person.data.name.charAt(0)}
+        <div aria-hidden="true" class="w-32 h-32 rounded-full bg-gray-200 dark:bg-gray-700 flex items-center justify-center text-4xl text-gray-500 dark:text-gray-400 flex-shrink-0">
+          {name.charAt(0)}
         </div>
       )}
       <div class="flex-1">
-        <h1 class="text-4xl font-bold mb-2">{person.data.name}</h1>
-        <p class="text-xl text-gray-600 dark:text-gray-400 mb-4">{person.data.role}</p>
-        
+        <h1 class="text-4xl font-bold mb-2">{name}</h1>
+        <p class="text-xl text-gray-600 dark:text-gray-400 mb-4">{title}</p>
+
         <div class="space-y-2">
+          {destination && (
+            <p class="text-gray-700 dark:text-gray-300">
+              <strong>{ui.person.destination[lang]}</strong>
+              <span class="ml-2">{destination}</span>
+            </p>
+          )}
+
           {person.data.email && (
             <p class="text-gray-700 dark:text-gray-300">
               <strong>{ui.person.email[lang]}</strong>
@@ -46,7 +77,7 @@ const { Content } = await render(person);
               </a>
             </p>
           )}
-          
+
           {person.data.links && person.data.links.length > 0 && (
             <div>
               <strong>{ui.person.links[lang]}</strong>
@@ -66,23 +97,27 @@ const { Content } = await render(person);
               </ul>
             </div>
           )}
-          
-          {person.data.interests && person.data.interests.length > 0 && (
+
+          {interests.length > 0 && (
             <div>
               <strong>{ui.person.interests[lang]}</strong>
-              <span class="ml-2">
-                {person.data.interests.join('、')}
-              </span>
+              <span class="ml-2">{interests.join(interestSeparator)}</span>
             </div>
           )}
         </div>
       </div>
     </div>
-    
+
+    {
+      isFallback && (
+        <p class="not-prose mb-6 rounded-lg border border-amber-500/30 bg-amber-500/10 px-4 py-2 text-sm text-amber-200">
+          {ui.i18n.fallbackNotice[lang]}
+        </p>
+      )
+    }
+
     <div class="mt-8">
       <Content />
     </div>
   </article>
 </BaseLayout>
-
-
diff --git a/src/pages/[lang]/people/index.astro b/src/pages/[lang]/people/index.astro
index 4ba904b..6ba8659 100644
--- a/src/pages/[lang]/people/index.astro
+++ b/src/pages/[lang]/people/index.astro
@@ -2,6 +2,8 @@
 import { getCollection } from 'astro:content';
 import BaseLayout from '../../../layouts/BaseLayout.astro';
 import { entrySlug } from '../../../utils/entrySlug';
+import { pickLocalized } from '../../../utils/localized';
+import { normalizeRole } from '../../../utils/roles';
 import { PeoplePage } from '../../../components/react/pages/PeoplePage';
 import { LOCALES, ui, type Lang } from '../../../i18n/ui';
 
@@ -12,10 +14,26 @@ export function getStaticPaths() {
 const lang = Astro.params.lang as Lang;
 
 const allPeople = await getCollection('people', ({ data }) => data.publish !== false);
-const people = allPeople.map((person) => ({
+
+// Sort here, not in the component: `order` then name, so the grouping in
+// PeoplePage only has to bucket by role. Members without an explicit order sort
+// after those that have one rather than jumping to the front.
+const sorted = [...allPeople].sort((a, b) => {
+  const ao = a.data.order ?? Number.MAX_SAFE_INTEGER;
+  const bo = b.data.order ?? Number.MAX_SAFE_INTEGER;
+  if (ao !== bo) return ao - bo;
+  return a.data.name.localeCompare(b.data.name, lang === 'zh' ? 'zh-CN' : 'en-US');
+});
+
+const people = sorted.map((person) => ({
   id: entrySlug(person),
-  name: person.data.name,
-  role: person.data.role,
+  name: pickLocalized(person.data, 'name', lang) ?? person.data.name,
+  // Already normalised by the schema; normalizeRole again is a no-op that keeps
+  // the type as Role rather than string.
+  role: normalizeRole(person.data.role),
+  title: pickLocalized(person.data, 'title', lang),
+  status: person.data.status,
+  destination: pickLocalized(person.data, 'destination', lang),
   avatar: person.data.avatar,
   email: person.data.email,
   interests: person.data.interests || [],
@@ -27,4 +45,3 @@ const people = allPeople.map((person) => ({
 <BaseLayout title={ui.people.title[lang]} description={ui.people.description[lang]} lang={lang}>
   <PeoplePage client:visible lang={lang} people={people} />
 </BaseLayout>
-
diff --git a/src/pages/[lang]/projects/[slug].astro b/src/pages/[lang]/projects/[slug].astro
index dc45897..50f1b84 100644
--- a/src/pages/[lang]/projects/[slug].astro
+++ b/src/pages/[lang]/projects/[slug].astro
@@ -4,20 +4,32 @@ import BaseLayout from '../../../layouts/BaseLayout.astro';
 import { LOCALES, ui, type Lang } from '../../../i18n/ui';
 import { formatDay } from '../../../utils/formatDate';
 import { entrySlug } from '../../../utils/entrySlug';
+import { pickLocalized, translationIndex } from '../../../utils/localized';
+import { COLLECTION_VAULT_PATHS } from '../../../utils/contentLayout.js';
 
 export async function getStaticPaths() {
   const projects = await getCollection('projects', ({ data }) => data.publish !== false);
-  return LOCALES.flatMap((lang) =>
-    projects.map((project) => ({
+  const translations = await getCollection('translations', ({ data }) => data.publish !== false);
+
+  return LOCALES.flatMap((lang) => {
+    const overlays = translationIndex(translations, COLLECTION_VAULT_PATHS.projects, lang);
+    return projects.map((project) => ({
       params: { lang, slug: entrySlug(project) },
-      props: { project },
-    }))
-  );
+      props: { project, overlay: overlays.get(project.id) },
+    }));
+  });
 }
 
 const lang = Astro.params.lang as Lang;
-const { project } = Astro.props;
-const { Content } = await render(project);
+const { project, overlay } = Astro.props;
+
+// English body from a `<name>.en.md` sibling; the Chinese original with a
+// notice when there is none.
+const { Content } = await render(overlay ?? project);
+const isFallback = lang !== 'zh' && !overlay;
+
+const title = pickLocalized(project.data, 'title', lang) ?? project.data.title;
+const summary = pickLocalized(project.data, 'summary', lang);
 
 // Get all people for name lookup
 const allPeople = await getCollection('people', ({ data }) => data.publish !== false);
@@ -26,7 +38,7 @@ const allPeople = await getCollection('people', ({ data }) => data.publish !== f
 // whichever form the author used.
 const peopleMap = new Map(
   allPeople.flatMap((p) => {
-    const entry = { name: p.data.name, slug: entrySlug(p) };
+    const entry = { name: pickLocalized(p.data, 'name', lang) ?? p.data.name, slug: entrySlug(p) };
     return [p.data.id, p.id, entry.slug]
       .filter(Boolean)
       .map((key) => [key, entry] as const);
@@ -41,9 +53,10 @@ const endDate = project.data.end_date
   : null;
 ---
 
-<BaseLayout title={project.data.title} description={project.data.title} lang={lang}>
+<BaseLayout title={title} description={summary ?? title} lang={lang}>
   <article class="prose dark:prose-invert max-w-none">
-    <h1>{project.data.title}</h1>
+    <h1>{title}</h1>
+    {summary && <p class="lead">{summary}</p>}
     
     <div class="mt-6 p-6 bg-gray-50 dark:bg-gray-800 rounded-lg border border-gray-200 dark:border-gray-700">
       <dl class="grid md:grid-cols-2 gap-4">
@@ -115,6 +128,14 @@ const endDate = project.data.end_date
       </dl>
     </div>
     
+    {
+      isFallback && (
+        <p class="not-prose mt-8 rounded-lg border border-amber-500/30 bg-amber-500/10 px-4 py-2 text-sm text-amber-800 dark:text-amber-200">
+          {ui.i18n.fallbackNotice[lang]}
+        </p>
+      )
+    }
+
     <div class="mt-8">
       <Content />
     </div>
diff --git a/src/pages/[lang]/projects/index.astro b/src/pages/[lang]/projects/index.astro
index 1183e89..f256663 100644
--- a/src/pages/[lang]/projects/index.astro
+++ b/src/pages/[lang]/projects/index.astro
@@ -2,6 +2,8 @@
 import { getCollection } from 'astro:content';
 import BaseLayout from '../../../layouts/BaseLayout.astro';
 import { entrySlug } from '../../../utils/entrySlug';
+import { pickLocalized } from '../../../utils/localized';
+import { normalizeRole } from '../../../utils/roles';
 import { ProjectsPage } from '../../../components/react/pages/ProjectsPage';
 import { LOCALES, ui, type Lang } from '../../../i18n/ui';
 
@@ -14,10 +16,14 @@ const lang = Astro.params.lang as Lang;
 const allProjects = await getCollection('projects', ({ data }) => data.publish !== false);
 const allPeople = await getCollection('people', ({ data }) => data.publish !== false);
 
+// Keyed by entrySlug, not the raw collection id. The detail page keys by
+// entrySlug, so a person whose filename differs from their frontmatter `id`
+// resolved to a name on one page and to a raw id on the other. entrySlug is
+// the single source of truth for both.
 const people = allPeople.map((p) => ({
-  id: p.id,
-  name: p.data.name,
-  role: p.data.role,
+  id: entrySlug(p),
+  name: pickLocalized(p.data, 'name', lang) ?? p.data.name,
+  role: normalizeRole(p.data.role),
   avatar: p.data.avatar
 }));
 
@@ -29,7 +35,9 @@ const projects = allProjects
   })
   .map((project) => ({
     id: entrySlug(project),
-    title: project.data.title,
+    title: pickLocalized(project.data, 'title', lang) ?? project.data.title,
+    summary: pickLocalized(project.data, 'summary', lang),
+    cover: project.data.cover,
     start_date: project.data.start_date instanceof Date ? project.data.start_date.toISOString().slice(0, 10) : project.data.start_date,
     end_date: project.data.end_date instanceof Date ? project.data.end_date.toISOString().slice(0, 10) : project.data.end_date,
     people: project.data.people || [],
diff --git a/src/pages/[lang]/research/[slug].astro b/src/pages/[lang]/research/[slug].astro
new file mode 100644
index 0000000..331c76c
--- /dev/null
+++ b/src/pages/[lang]/research/[slug].astro
@@ -0,0 +1,130 @@
+---
+import { getCollection, render } from 'astro:content';
+import BaseLayout from '../../../layouts/BaseLayout.astro';
+import { entrySlug } from '../../../utils/entrySlug';
+import { pickLocalized, translationIndex } from '../../../utils/localized';
+import { COLLECTION_VAULT_PATHS } from '../../../utils/contentLayout.js';
+import { LOCALES, ui, type Lang } from '../../../i18n/ui';
+
+export async function getStaticPaths() {
+  const themes = await getCollection('research', ({ data }) => data.publish !== false);
+  const translations = await getCollection('translations', ({ data }) => data.publish !== false);
+  const people = await getCollection('people', ({ data }) => data.publish !== false);
+  const publications = await getCollection('publications', ({ data }) => data.publish !== false);
+  const projects = await getCollection('projects', ({ data }) => data.publish !== false);
+
+  return LOCALES.flatMap((lang) => {
+    const overlays = translationIndex(translations, COLLECTION_VAULT_PATHS.research, lang);
+    return themes.map((theme) => ({
+      params: { lang, slug: entrySlug(theme) },
+      props: {
+        theme,
+        overlay: overlays.get(theme.id),
+        // Resolved here rather than in the template so an id matching nothing
+        // is dropped once instead of rendering a dead link.
+        //
+        // flatMap, not map + filter(Boolean): the latter does not narrow away
+        // `undefined` in TypeScript, so every downstream read would need a
+        // non-null assertion — which is exactly how a missing reference turns
+        // into a runtime crash instead of an omitted list item.
+        people: theme.data.people.flatMap((id) => {
+          const match = people.find((p) => entrySlug(p) === id || p.data.id === id);
+          return match ? [match] : [];
+        }),
+        publications: theme.data.featured_publications.flatMap((key) => {
+          const match = publications.find((p) => p.data.bib_key === key || p.id === key);
+          return match ? [match] : [];
+        }),
+        projects: theme.data.projects.flatMap((id) => {
+          const match = projects.find((p) => entrySlug(p) === id || p.data.id === id);
+          return match ? [match] : [];
+        }),
+      },
+    }));
+  });
+}
+
+const lang = Astro.params.lang as Lang;
+const { theme, overlay, people, publications, projects } = Astro.props;
+
+const { Content } = await render(overlay ?? theme);
+const isFallback = lang !== 'zh' && !overlay;
+
+const title = pickLocalized(theme.data, 'title', lang) ?? theme.data.title;
+const summary = pickLocalized(theme.data, 'summary', lang);
+---
+
+<BaseLayout title={title} description={summary ?? title} lang={lang}>
+  <article class="prose dark:prose-invert max-w-none">
+    <h1>{title}</h1>
+    {summary && <p class="lead">{summary}</p>}
+
+    {
+      isFallback && (
+        <p class="not-prose my-6 rounded-lg border border-amber-500/30 bg-amber-500/10 px-4 py-2 text-sm text-amber-800 dark:text-amber-200">
+          {ui.i18n.fallbackNotice[lang]}
+        </p>
+      )
+    }
+
+    <Content />
+
+    {
+      people.length > 0 && (
+        <section>
+          <h2>{ui.research.people[lang]}</h2>
+          <ul>
+            {people.map((person) => (
+              <li>
+                <a href={`/${lang}/people/${entrySlug(person)}`}>
+                  {pickLocalized(person.data, 'name', lang) ?? person.data.name}
+                </a>
+              </li>
+            ))}
+          </ul>
+        </section>
+      )
+    }
+
+    {
+      publications.length > 0 && (
+        <section>
+          <h2>{ui.research.publications[lang]}</h2>
+          <ul>
+            {publications.map((pub) => (
+              <li>
+                {pub.data.doi || pub.data.pdf ? (
+                  <a href={pub.data.doi ?? pub.data.pdf}>{pub.data.title}</a>
+                ) : (
+                  pub.data.title
+                )}
+                {pub.data.venue && <em> — {pub.data.venue}</em>}
+                {pub.data.year && ` (${pub.data.year})`}
+                {pickLocalized(pub.data, 'highlight', lang) && (
+                  <p class="text-sm">{pickLocalized(pub.data, 'highlight', lang)}</p>
+                )}
+              </li>
+            ))}
+          </ul>
+        </section>
+      )
+    }
+
+    {
+      projects.length > 0 && (
+        <section>
+          <h2>{ui.research.projects[lang]}</h2>
+          <ul>
+            {projects.map((project) => (
+              <li>
+                <a href={`/${lang}/projects/${entrySlug(project)}`}>
+                  {pickLocalized(project.data, 'title', lang) ?? project.data.title}
+                </a>
+              </li>
+            ))}
+          </ul>
+        </section>
+      )
+    }
+  </article>
+</BaseLayout>
diff --git a/src/pages/[lang]/research/index.astro b/src/pages/[lang]/research/index.astro
new file mode 100644
index 0000000..bc80249
--- /dev/null
+++ b/src/pages/[lang]/research/index.astro
@@ -0,0 +1,60 @@
+---
+import { getCollection } from 'astro:content';
+import BaseLayout from '../../../layouts/BaseLayout.astro';
+import { entrySlug } from '../../../utils/entrySlug';
+import { pickLocalized } from '../../../utils/localized';
+import { LOCALES, ui, type Lang } from '../../../i18n/ui';
+
+export function getStaticPaths() {
+  return LOCALES.map((lang) => ({ params: { lang } }));
+}
+
+const lang = Astro.params.lang as Lang;
+
+// Themes are few and hand-ordered — `order` is required-with-a-default rather
+// than optional, because "whatever the filesystem returned" is not an ordering
+// anyone chose.
+const themes = (await getCollection('research', ({ data }) => data.publish !== false)).sort(
+  (a, b) => a.data.order - b.data.order
+);
+---
+
+<BaseLayout title={ui.research.title[lang]} description={ui.research.description[lang]} lang={lang}>
+  <div class="space-y-8">
+    <div>
+      <h1 class="text-3xl md:text-4xl font-light mb-2 tracking-tight">{ui.research.title[lang]}</h1>
+      <p class="text-lg text-gray-600 dark:text-gray-400">{ui.research.description[lang]}</p>
+    </div>
+
+    {
+      themes.length === 0 ? (
+        <p class="text-gray-500 dark:text-gray-400">{ui.research.empty[lang]}</p>
+      ) : (
+        <div class="grid grid-cols-1 md:grid-cols-2 gap-6">
+          {themes.map((theme) => (
+            <a
+              href={`/${lang}/research/${entrySlug(theme)}`}
+              class="block rounded-2xl border border-white/10 bg-white/5 p-6 transition-colors hover:border-teal-300/50 focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-teal-300"
+            >
+              {theme.data.cover && (
+                <img
+                  src={theme.data.cover}
+                  alt=""
+                  loading="lazy"
+                  decoding="async"
+                  class="mb-4 aspect-video w-full rounded-lg object-cover"
+                />
+              )}
+              <h2 class="text-xl font-medium mb-2">
+                {pickLocalized(theme.data, 'title', lang) ?? theme.data.title}
+              </h2>
+              <p class="text-sm text-gray-600 dark:text-gray-400">
+                {pickLocalized(theme.data, 'summary', lang)}
+              </p>
+            </a>
+          ))}
+        </div>
+      )
+    }
+  </div>
+</BaseLayout>
diff --git a/src/pages/[lang]/resources/index.astro b/src/pages/[lang]/resources/index.astro
new file mode 100644
index 0000000..137096b
--- /dev/null
+++ b/src/pages/[lang]/resources/index.astro
@@ -0,0 +1,91 @@
+---
+import { getCollection } from 'astro:content';
+import BaseLayout from '../../../layouts/BaseLayout.astro';
+import { pickLocalized } from '../../../utils/localized';
+import { formatDay } from '../../../utils/formatDate';
+import { LOCALES, ui, type Lang } from '../../../i18n/ui';
+
+export function getStaticPaths() {
+  return LOCALES.map((lang) => ({ params: { lang } }));
+}
+
+const lang = Astro.params.lang as Lang;
+
+// Newest first: a resources page is a list of things to go and get, and the
+// most recent release is almost always the one a visitor wants.
+const resources = (await getCollection('resources', ({ data }) => data.publish !== false)).sort(
+  (a, b) => (b.data.released?.getTime() ?? 0) - (a.data.released?.getTime() ?? 0)
+);
+---
+
+<BaseLayout title={ui.resources.title[lang]} description={ui.resources.description[lang]} lang={lang}>
+  <div class="space-y-8">
+    <div>
+      <h1 class="text-3xl md:text-4xl font-light mb-2 tracking-tight">{ui.resources.title[lang]}</h1>
+      <p class="text-lg text-gray-600 dark:text-gray-400">{ui.resources.description[lang]}</p>
+    </div>
+
+    {
+      resources.length === 0 ? (
+        <p class="text-gray-500 dark:text-gray-400">{ui.resources.empty[lang]}</p>
+      ) : (
+        <ul class="grid grid-cols-1 md:grid-cols-2 gap-6 list-none p-0">
+          {resources.map((resource) => (
+            <li class="rounded-2xl border border-white/10 bg-white/5 p-6">
+              <div class="mb-2 flex items-center gap-2">
+                <span class="rounded-full border border-teal-500/30 px-2 py-0.5 text-xs uppercase tracking-wider text-teal-300">
+                  {ui.resourceTypes[resource.data.type][lang]}
+                </span>
+                {resource.data.version && (
+                  <span class="font-mono text-xs text-gray-400">{resource.data.version}</span>
+                )}
+              </div>
+
+              <h2 class="mb-2 text-xl font-medium">
+                <a
+                  href={resource.data.url}
+                  rel="noopener"
+                  class="hover:underline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-teal-300"
+                >
+                  {pickLocalized(resource.data, 'title', lang) ?? resource.data.title}
+                </a>
+              </h2>
+
+              <p class="mb-3 text-sm text-gray-600 dark:text-gray-400">
+                {pickLocalized(resource.data, 'summary', lang)}
+              </p>
+
+              <dl class="flex flex-wrap gap-x-4 gap-y-1 text-xs text-gray-500 dark:text-gray-400">
+                {resource.data.license && (
+                  <div>
+                    <dt class="inline font-medium">{ui.resources.license[lang]}</dt>
+                    <dd class="inline ml-1">{resource.data.license}</dd>
+                  </div>
+                )}
+                {resource.data.released && (
+                  <div>
+                    <dt class="inline font-medium">{ui.resources.released[lang]}</dt>
+                    <dd class="inline ml-1">{formatDay(resource.data.released, lang)}</dd>
+                  </div>
+                )}
+                {resource.data.doi && (
+                  <div>
+                    <dt class="inline font-medium">DOI</dt>
+                    <dd class="inline ml-1">
+                      <a
+                        href={resource.data.doi.startsWith('http') ? resource.data.doi : `https://doi.org/${resource.data.doi}`}
+                        class="hover:underline"
+                      >
+                        {resource.data.doi}
+                      </a>
+                    </dd>
+                  </div>
+                )}
+              </dl>
+            </li>
+          ))}
+        </ul>
+      )
+    }
+  </div>
+</BaseLayout>
diff --git a/src/styles/global.css b/src/styles/global.css
index 593382e..d339e38 100644
--- a/src/styles/global.css
+++ b/src/styles/global.css
@@ -1,5 +1,23 @@
 @import "tailwindcss";
 
+/**
+ * `dark:` follows an explicit class, not the reader's OS setting.
+ *
+ * Every page sits on a fixed dark photograph under a dark tint, and that
+ * backdrop does not change with prefers-color-scheme. But all 65 `dark:`
+ * utilities in this codebase were gated on prefers-color-scheme, so a reader
+ * in LIGHT mode got the light half of every pair — #374151 nav links, near
+ * black body text and `prose` without `prose-invert` — rendered on top of that
+ * dark photo. The site was only legible for readers whose OS happened to be in
+ * dark mode.
+ *
+ * BaseLayout puts `class="dark"` on <html> unconditionally, so the dark half
+ * always wins. Rewriting the 65 utilities instead would have been 65 chances to
+ * miss one, and would have thrown away the ability to offer a light theme
+ * later — which now needs only for that class to become conditional.
+ */
+@custom-variant dark (&:where(.dark, .dark *));
+
 /* Obsidian Callouts Styles */
 .admonition {
   @apply my-4 rounded-lg border-l-4 p-4;
diff --git a/src/utils/contentLayout.js b/src/utils/contentLayout.js
index 2313e82..647c32b 100644
--- a/src/utils/contentLayout.js
+++ b/src/utils/contentLayout.js
@@ -1,11 +1,72 @@
 /**
  * Facts about the vault layout that more than one place needs to agree on.
  *
- * Deliberately dependency-free: `astro.config.mjs` imports this at config-load
- * time, before Astro's `astro:content` virtual module exists, so this file must
- * not reach for it (that is why it does not live in libraryEntries.ts).
+ * Deliberately free of Astro imports: `astro.config.mjs` imports this at
+ * config-load time, before Astro's `astro:content` virtual module exists, so
+ * this file must not reach for it (that is why it does not live in
+ * libraryEntries.ts). Node builtins are fine — the config runs in Node.
  */
 
+import fs from 'node:fs';
+import path from 'node:path';
+
+/** Top-level vault directories, by the collection each one feeds. */
+export const VAULT_DIRS = {
+  people: '通讯录',
+  news: '档案馆',
+  library: '图书馆',
+};
+
+/**
+ * Resolve the Obsidian vault root.
+ *
+ * `scripts/setup-content.mjs` can leave the vault in one of three shapes, so
+ * every consumer has to probe for all three. This was copy-pasted verbatim into
+ * both loaders (differing only in which directory it sniffed for), which is
+ * exactly the duplication this module exists to prevent — and it is the
+ * function that throws the error every new contributor hits first.
+ *
+ * @param {string} [sentinel] a directory that must exist directly under the
+ *   root, used to tell a bare `.content` apart from an unrelated folder.
+ *   Defaults to the library, which every vault has.
+ * @returns {string} absolute path to the vault root
+ */
+export function getContentRoot(sentinel = VAULT_DIRS.library) {
+  const root = findContentRoot(sentinel);
+  if (!root) throw new Error('Content root not found. Please run npm run setup:content');
+  return root;
+}
+
+/**
+ * As {@link getContentRoot}, but returns null instead of throwing.
+ *
+ * `src/content.config.ts` needs the vault path at *config-load* time to point a
+ * glob at a root-level file. Throwing there would turn "content not synced yet"
+ * — the normal state of a fresh clone — into a crash before Astro can print
+ * anything useful. A missing base makes the glob yield nothing instead, and the
+ * consumers fall back to their defaults.
+ *
+ * @param {string} [sentinel]
+ * @returns {string | null}
+ */
+export function findContentRoot(sentinel = VAULT_DIRS.library) {
+  const cwd = process.cwd();
+
+  // .content/Team-Guidebook (a clone that kept its repository directory)
+  const nested = path.join(cwd, '.content', 'Team-Guidebook');
+  if (fs.existsSync(nested)) return nested;
+
+  // .content IS the vault (a symlink straight at the vault, or a bare clone)
+  const dotContent = path.join(cwd, '.content');
+  if (fs.existsSync(path.join(dotContent, sentinel))) return dotContent;
+
+  // A vault checked out beside the site, without setup-content.mjs having run
+  const local = path.join(cwd, 'Team-Guidebook');
+  if (fs.existsSync(local)) return local;
+
+  return null;
+}
+
 /**
  * Subdirectories of 图书馆/ that have their own collection.
  *
@@ -14,13 +75,52 @@
  * both at /[lang]/projects/<id> and at /[lang]/library/项目/<id>, the latter
  * through a passthrough schema that knows nothing about project fields.
  */
-export const OWNED_BY_OTHER_COLLECTIONS = ['项目', '文献'];
+export const OWNED_BY_OTHER_COLLECTIONS = ['项目', '文献', '研究', '资源'];
 
 /** Glob patterns for the same rule, for loaders that take exclusions. */
 export const OWNED_BY_OTHER_COLLECTIONS_GLOBS = OWNED_BY_OTHER_COLLECTIONS.map(
   (dir) => `!${dir}/**`
 );
 
+/** Locales that a `<name>.<locale>.md` sibling file can carry. */
+export const CONTENT_LOCALES = ['zh', 'en'];
+
+/**
+ * Exclusions that keep translation siblings out of a base collection.
+ *
+ * `通讯录/song-shuang.en.md` holds an English biography and nothing else — no
+ * role, no email, because those are language-independent and live once in the
+ * base note. It therefore cannot satisfy the people schema, and it must not
+ * become a second person. It is picked up by the `translations` collection
+ * instead, which has a schema shaped for an overlay.
+ */
+export const TRANSLATION_GLOBS = CONTENT_LOCALES.map((locale) => `!**/*.${locale}.md`);
+
+/**
+ * Where each collection's notes sit, relative to the vault root.
+ *
+ * The `translations` collection globs the whole vault, so its ids are
+ * vault-relative paths (`通讯录/song-shuang.en`). Pairing one back to a people
+ * entry (`song-shuang`) needs this prefix.
+ */
+export const COLLECTION_VAULT_PATHS = {
+  people: '通讯录',
+  projects: '图书馆/项目',
+  research: '图书馆/研究',
+  resources: '图书馆/资源',
+  library: '图书馆',
+};
+
+/**
+ * Where the publications sidecars live, under the vault's 文献/ directory.
+ *
+ * A `.bib` file is the authority on citation facts and is regenerated wholesale
+ * by Zotero, which drops any non-standard field written into it. Anything the
+ * site adds — a cover image, a one-line highlight, links to code and data —
+ * therefore has to live beside it, keyed by citation key.
+ */
+export const PUBLICATION_SIDECAR_DIR = '精选';
+
 /**
  * Does this collection id / relative path belong to another collection?
  * @param {string} idOrPath
diff --git a/src/utils/localized.ts b/src/utils/localized.ts
new file mode 100644
index 0000000..632e69f
--- /dev/null
+++ b/src/utils/localized.ts
@@ -0,0 +1,145 @@
+import { LOCALES, type Lang } from '../i18n/ui';
+
+/**
+ * The one convention for bilingual vault content.
+ *
+ * Two mechanisms, chosen by field length:
+ *
+ *   1. **Short structured fields** are paired in one file: `name` holds the
+ *      base (Chinese) value, `name_en` the English one. Duplicating whole
+ *      files for a person's role and email means maintaining the
+ *      language-independent half twice, and it drifts.
+ *
+ *   2. **Long prose** lives in a sibling file: `通讯录/song-shuang.md` and
+ *      `通讯录/song-shuang.en.md`. Nobody wants an English biography inside a
+ *      YAML string, and Obsidian shows the two notes next to each other.
+ *
+ * Chinese is the base language throughout; English is the optional overlay.
+ * When it is missing the reader gets the Chinese with a notice, never a blank
+ * page. `/zh` and `/en` previously served byte-identical bodies, so the
+ * fallback is the *current* behaviour — this module only adds the ability to
+ * do better where a translation exists.
+ */
+
+/** Suffixes that mark a file as a translation, e.g. `.en` in `bio.en.md`. */
+const TRANSLATION_SUFFIXES = LOCALES.map((locale) => `.${locale}`);
+
+/**
+ * Split a collection id into its base id and the locale it translates, if any.
+ *
+ * `song-shuang.en` -> `{ baseId: 'song-shuang', lang: 'en' }`
+ * `song-shuang`    -> `{ baseId: 'song-shuang', lang: undefined }`
+ */
+export function splitTranslationId(id: string): { baseId: string; lang?: Lang } {
+  for (const suffix of TRANSLATION_SUFFIXES) {
+    if (id.endsWith(suffix)) {
+      return { baseId: id.slice(0, -suffix.length), lang: suffix.slice(1) as Lang };
+    }
+  }
+  return { baseId: id };
+}
+
+/** Is this entry a translation overlay rather than a page of its own? */
+export function isTranslation(id: string): boolean {
+  return splitTranslationId(id).lang !== undefined;
+}
+
+/**
+ * Read a field in the requested language, falling back to the base value.
+ *
+ * `pickLocalized(person.data, 'name', 'en')` returns `name_en` when it is a
+ * non-empty string, else `name`. A whitespace-only translation counts as
+ * absent: an author who typed a space should get the Chinese, not a blank.
+ */
+export function pickLocalized(
+  data: Record<string, unknown>,
+  field: string,
+  lang: Lang
+): string | undefined {
+  if (lang !== 'zh') {
+    const translated = data[`${field}_${lang}`];
+    if (typeof translated === 'string' && translated.trim()) return translated;
+  }
+  const base = data[field];
+  return typeof base === 'string' && base.trim() ? base : undefined;
+}
+
+/** As {@link pickLocalized}, for array fields such as `interests`. */
+export function pickLocalizedList(
+  data: Record<string, unknown>,
+  field: string,
+  lang: Lang
+): string[] {
+  if (lang !== 'zh') {
+    const translated = data[`${field}_${lang}`];
+    if (Array.isArray(translated) && translated.length) return translated as string[];
+  }
+  const base = data[field];
+  return Array.isArray(base) ? (base as string[]) : [];
+}
+
+export interface LocalizedEntry<T extends { id: string }, X extends { id: string } = T> {
+  /** The base entry. Frontmatter is always read from here. */
+  entry: T;
+  /** The entry to `render()` for the body — the translation when one exists. */
+  bodySource: T | X;
+  /** False when the reader is seeing the base language as a fallback. */
+  hasTranslation: boolean;
+}
+
+/**
+ * Index translation-overlay entries by the base id they translate.
+ *
+ * Overlays live in their own `translations` collection rather than alongside
+ * their bases. They carry a body and nothing else — no role, no email, because
+ * those are language-independent and belong in the base note exactly once — so
+ * they cannot satisfy a base schema, and a union schema would make every
+ * consumer treat `name` as possibly-undefined. A separate collection with a
+ * schema shaped for an overlay costs one glob and keeps both types honest.
+ *
+ * That collection globs the whole vault, so its ids are vault-relative
+ * (`通讯录/song-shuang.en`). `prefix` strips the directory back off.
+ *
+ * @param prefix the collection's path under the vault root, e.g. `通讯录`
+ */
+export function translationIndex<X extends { id: string }>(
+  translations: X[],
+  prefix: string,
+  lang: Lang
+): Map<string, X> {
+  const index = new Map<string, X>();
+  const dir = prefix.endsWith('/') ? prefix : `${prefix}/`;
+
+  for (const translation of translations) {
+    if (!translation.id.startsWith(dir)) continue;
+    const { baseId, lang: entryLang } = splitTranslationId(translation.id.slice(dir.length));
+    // Overlays for other locales are simply not this page's business.
+    if (entryLang === lang) index.set(baseId, translation);
+  }
+  return index;
+}
+
+/**
+ * Pair base entries with their translation overlays for one locale.
+ *
+ * Also drops any `.en`-suffixed entry that leaked into the base collection —
+ * belt and braces behind the loader's exclusion globs, because a leak is not
+ * cosmetic: `src/pages/[lang]/library/[...slug].astro` throws on duplicate
+ * slugs, so it would fail the build rather than quietly shadow a page.
+ */
+export function resolveLocalized<T extends { id: string }, X extends { id: string } = T>(
+  entries: T[],
+  lang: Lang,
+  translations?: Map<string, X>
+): Array<LocalizedEntry<T, X>> {
+  return entries
+    .filter((entry) => !isTranslation(entry.id))
+    .map((entry) => {
+      const translation = translations?.get(entry.id);
+      return {
+        entry,
+        bodySource: translation ?? entry,
+        hasTranslation: translation !== undefined,
+      };
+    });
+}
diff --git a/src/utils/remark-obsidian-callouts.js b/src/utils/remark-obsidian-callouts.js
index 7bdf352..c7af8a4 100644
--- a/src/utils/remark-obsidian-callouts.js
+++ b/src/utils/remark-obsidian-callouts.js
@@ -14,7 +14,7 @@ const CALLOUT_TYPES = [
  */
 export default function remarkObsidianCallouts() {
   return function attacher() {
-    return function transformer(tree, file) {
+    return function transformer(tree) {
       if (!tree) return tree;
       visit(tree, 'blockquote', (node, index, parent) => {
         if (!parent || typeof index !== 'number' || !node.children || node.children.length === 0) {
@@ -26,18 +26,6 @@ export default function remarkObsidianCallouts() {
           return;
         }
 
-        const extractText = (nodes) => {
-          let text = '';
-          for (const child of nodes) {
-            if (child.type === 'text') {
-              text += child.value;
-            } else if (child.children) {
-              text += extractText(child.children);
-            }
-          }
-          return text;
-        };
-
         // The marker lives on the FIRST LINE only. Matching against the whole
         // flattened paragraph made `\s*` swallow the newline, so a callout
         // whose body started on the next line either failed to match (when it
diff --git a/src/utils/render-markdown.js b/src/utils/render-markdown.js
index 089b79a..03cd435 100644
--- a/src/utils/render-markdown.js
+++ b/src/utils/render-markdown.js
@@ -120,11 +120,18 @@ function createProcessor(options = {}) {
 /**
  * Render Markdown to sanitised HTML.
  *
+ * `options` exists so tests can supply a hand-built content index instead of
+ * globbing `src/content/library` off disk — the shared processor is cached
+ * precisely because that glob is expensive, and a test must not depend on the
+ * vault symlinks being wired up. Production callers pass nothing.
+ *
  * @param {string} markdown
+ * @param {object} [options]
+ * @param {ReturnType<typeof buildContentIndex>} [options.index]
  * @returns {Promise<string>}
  */
-export async function renderMarkdown(markdown) {
-  sharedProcessor ??= createProcessor();
-  const result = await sharedProcessor.process(markdown);
+export async function renderMarkdown(markdown, options) {
+  const processor = options?.index ? createProcessor(options) : (sharedProcessor ??= createProcessor());
+  const result = await processor.process(markdown);
   return String(result).trim();
 }
diff --git a/src/utils/roles.ts b/src/utils/roles.ts
new file mode 100644
index 0000000..37c7b87
--- /dev/null
+++ b/src/utils/roles.ts
@@ -0,0 +1,142 @@
+import type { Lang } from '../i18n/ui';
+
+/**
+ * The canonical vocabulary for a lab member's position.
+ *
+ * `role` used to be free text, and PeoplePage grouped by comparing it against a
+ * hardcoded list of ten spellings ('Professor', '教授', 'PhD Student', '博士生',
+ * …). Anything not on that list — 'Ph.D. student', '副教授', 'Undergraduate',
+ * a trailing space — sorted to position 999 and rendered as its own one-person
+ * section, with no error anywhere. A closed vocabulary makes grouping total.
+ *
+ * The order here IS the display order: PI first, then descending seniority,
+ * with the catch-all last.
+ */
+export const ROLES = [
+  'pi',
+  'postdoc',
+  'phd',
+  'master',
+  'undergrad',
+  'staff',
+  'visitor',
+  'other',
+] as const;
+
+export type Role = (typeof ROLES)[number];
+
+/**
+ * Section headings, per locale — plural in English.
+ *
+ * Free-text job titles go in `title`/`title_en`; this is only the group name.
+ */
+export const ROLE_LABELS: Record<Role, Record<Lang, string>> = {
+  pi: { zh: '负责人', en: 'Principal Investigator' },
+  postdoc: { zh: '博士后', en: 'Postdocs' },
+  phd: { zh: '博士生', en: 'PhD Students' },
+  master: { zh: '硕士生', en: 'Master Students' },
+  undergrad: { zh: '本科生', en: 'Undergraduates' },
+  staff: { zh: '研究人员', en: 'Staff' },
+  visitor: { zh: '访问学者', en: 'Visiting Scholars' },
+  other: { zh: '其他成员', en: 'Others' },
+};
+
+/**
+ * The same roles naming one person, for a card subtitle or a detail page.
+ *
+ * Separate from ROLE_LABELS because English pluralises: a heading over a list
+ * says "PhD Students", but one person's card must not. Chinese does not
+ * distinguish, so the values coincide there — which is exactly why a single
+ * table would have looked correct in review and been wrong in English.
+ */
+export const ROLE_TITLES: Record<Role, Record<Lang, string>> = {
+  pi: { zh: '负责人', en: 'Principal Investigator' },
+  postdoc: { zh: '博士后', en: 'Postdoc' },
+  phd: { zh: '博士生', en: 'PhD Student' },
+  master: { zh: '硕士生', en: 'Master Student' },
+  undergrad: { zh: '本科生', en: 'Undergraduate' },
+  staff: { zh: '研究人员', en: 'Staff' },
+  visitor: { zh: '访问学者', en: 'Visiting Scholar' },
+  other: { zh: '成员', en: 'Member' },
+};
+
+/** Heading for the alumni section, which cuts across roles. */
+export const ALUMNI_LABEL: Record<Lang, string> = { zh: '毕业与离任成员', en: 'Alumni' };
+
+/**
+ * Spellings that map onto a canonical role.
+ *
+ * Deliberately generous, and it includes every value the vault used before this
+ * vocabulary existed. Normalising rather than rejecting means adopting the enum
+ * does not require rewriting every note in 通讯录/ on the same commit.
+ */
+const ALIASES: Record<string, Role> = {
+  // PI
+  pi: 'pi',
+  professor: 'pi',
+  'principal investigator': 'pi',
+  'group leader': 'pi',
+  教授: 'pi',
+  副教授: 'pi',
+  研究员: 'pi',
+  负责人: 'pi',
+  课题组长: 'pi',
+  研究组长: 'pi',
+  // Postdoc
+  postdoc: 'postdoc',
+  'postdoctoral researcher': 'postdoc',
+  'post-doc': 'postdoc',
+  博士后: 'postdoc',
+  // PhD
+  phd: 'phd',
+  'phd student': 'phd',
+  'ph.d. student': 'phd',
+  'doctoral student': 'phd',
+  博士生: 'phd',
+  博士研究生: 'phd',
+  // Master
+  master: 'master',
+  'master student': 'master',
+  "master's student": 'master',
+  'msc student': 'master',
+  硕士生: 'master',
+  硕士研究生: 'master',
+  // Undergraduate
+  undergrad: 'undergrad',
+  undergraduate: 'undergrad',
+  'undergraduate student': 'undergrad',
+  本科生: 'undergrad',
+  // Staff
+  staff: 'staff',
+  engineer: 'staff',
+  'research assistant': 'staff',
+  科研助理: 'staff',
+  工程师: 'staff',
+  行政: 'staff',
+  // Visitor
+  visitor: 'visitor',
+  'visiting scholar': 'visitor',
+  'visiting student': 'visitor',
+  访问学者: 'visitor',
+  访问学生: 'visitor',
+};
+
+/**
+ * Map a frontmatter `role` value onto the canonical vocabulary.
+ *
+ * Unknown values become `other` rather than throwing. A build that dies because
+ * someone wrote a job title the enum had not anticipated is worse than a
+ * labelled "Others" section — but `other` is visible in the rendered page, so
+ * the mistake still surfaces to whoever wrote it.
+ */
+export function normalizeRole(raw: string | undefined | null): Role {
+  if (!raw) return 'other';
+  const key = raw.trim().toLowerCase();
+  if ((ROLES as readonly string[]).includes(key)) return key as Role;
+  return ALIASES[key] ?? 'other';
+}
+
+/** Sort comparator putting roles in ROLES order. */
+export function compareRoles(a: Role, b: Role): number {
+  return ROLES.indexOf(a) - ROLES.indexOf(b);
+}
diff --git a/src/utils/siteConfig.ts b/src/utils/siteConfig.ts
new file mode 100644
index 0000000..b04202b
--- /dev/null
+++ b/src/utils/siteConfig.ts
@@ -0,0 +1,74 @@
+import { getEntry } from 'astro:content';
+import type { Lang } from '../i18n/ui';
+
+/**
+ * Site identity, resolved for one locale.
+ *
+ * Every consumer wants the same thing — "the lab's name, in this language,
+ * definitely a string" — so the localisation and the fallbacks happen once,
+ * here. Components that reach into `entry.data.name_en ?? entry.data.name`
+ * themselves are how the three conflicting identities happened in the first
+ * place.
+ */
+export interface ResolvedSite {
+  name: string;
+  tagline?: string;
+  headline?: string;
+  headlineAccent?: string;
+  affiliation?: string;
+  logo?: string;
+  email?: string;
+  address?: string;
+  socials: Array<{ label: string; url: string; icon?: string }>;
+  nav?: Array<{ href: string; label: string }>;
+  footerNote?: string;
+}
+
+/**
+ * Fallback used when the vault has no site.md.
+ *
+ * Deliberately generic. A placeholder that named a specific lab would look
+ * correct on someone else's deployment and never get replaced — which is the
+ * failure mode this whole module exists to end.
+ */
+const FALLBACK: Record<Lang, { name: string }> = {
+  zh: { name: '实验室' },
+  en: { name: 'Lab' },
+};
+
+/** Pick `field_en` for English when present, else the base (Chinese) field. */
+function pick<T extends Record<string, unknown>>(
+  data: T,
+  field: string,
+  lang: Lang
+): string | undefined {
+  const base = data[field];
+  if (lang === 'en') {
+    const translated = data[`${field}_en`];
+    if (typeof translated === 'string' && translated.trim()) return translated;
+  }
+  return typeof base === 'string' && base.trim() ? base : undefined;
+}
+
+export async function getSiteConfig(lang: Lang): Promise<ResolvedSite> {
+  const entry = await getEntry('site', 'site');
+  if (!entry) return { ...FALLBACK[lang], socials: [] };
+
+  const d = entry.data;
+  return {
+    name: pick(d, 'name', lang) ?? FALLBACK[lang].name,
+    tagline: pick(d, 'tagline', lang),
+    headline: pick(d, 'headline', lang),
+    headlineAccent: pick(d, 'headline_accent', lang),
+    affiliation: pick(d, 'affiliation', lang),
+    logo: d.logo,
+    email: d.email,
+    address: pick(d, 'address', lang),
+    socials: d.socials ?? [],
+    nav: d.nav?.map((item) => ({
+      href: item.href,
+      label: (lang === 'en' && item.label_en) || item.label,
+    })),
+    footerNote: pick(d, 'footer_note', lang),
+  };
+}
diff --git a/test/entrySlug.test.ts b/test/entrySlug.test.ts
new file mode 100644
index 0000000..f56bd21
--- /dev/null
+++ b/test/entrySlug.test.ts
@@ -0,0 +1,47 @@
+import { describe, expect, it } from 'vitest';
+import { entrySlug, slugify } from '../src/utils/entrySlug';
+
+describe('slugify', () => {
+  it('strips the .md extension', () => {
+    expect(slugify('boyu-wang.md')).toBe('boyu-wang');
+  });
+
+  it('turns spaces into hyphens instead of leaving them in an href', () => {
+    // The bug this function exists for: ids like `Boyu Wang.md` became
+    // `/zh/people/Boyu Wang.md` — a bare space in a URL.
+    expect(slugify('Boyu Wang.md')).toBe('boyu-wang');
+  });
+
+  it('keeps CJK characters rather than dropping them to an empty slug', () => {
+    expect(slugify('词条/Git')).toBe('词条/git');
+    expect(slugify('宋爽')).toBe('宋爽');
+  });
+
+  it('preserves path separators but slugifies each segment', () => {
+    expect(slugify('专栏/Python4Science/Week1 导论')).toBe('专栏/python4science/week1-导论');
+  });
+
+  it('collapses runs of punctuation into a single hyphen and trims them', () => {
+    expect(slugify('--a...b--')).toBe('a-b');
+  });
+
+  it('drops empty segments instead of emitting a double slash', () => {
+    expect(slugify('a//b')).toBe('a/b');
+  });
+});
+
+describe('entrySlug', () => {
+  it('prefers the frontmatter id over the filename', () => {
+    expect(entrySlug({ id: '通讯录/Ada Lovelace.md', data: { id: 'ada-lovelace' } })).toBe(
+      'ada-lovelace',
+    );
+  });
+
+  it('falls back to the filename when no id is declared', () => {
+    expect(entrySlug({ id: 'Ada Lovelace.md', data: {} })).toBe('ada-lovelace');
+  });
+
+  it('treats a blank id as absent rather than producing an empty slug', () => {
+    expect(entrySlug({ id: 'ada-lovelace.md', data: { id: '   ' } })).toBe('ada-lovelace');
+  });
+});
diff --git a/test/formatDate.test.ts b/test/formatDate.test.ts
new file mode 100644
index 0000000..50d27de
--- /dev/null
+++ b/test/formatDate.test.ts
@@ -0,0 +1,69 @@
+import { describe, expect, it } from 'vitest';
+import { formatDay, formatMonth, localeOf, parseCalendarDate } from '../src/utils/formatDate';
+
+/**
+ * These tests exist to pin the UTC convention. The regression they guard:
+ * a daily note `2025-12-17.md` parsed as UTC midnight but rendered in the
+ * reader's zone showed "Dec 16" west of Greenwich, and publicationsLoader's
+ * `new Date(year, 0, 1)` (local midnight) serialised a 2024 paper as
+ * 2023-12-31 in UTC+8.
+ */
+
+describe('parseCalendarDate', () => {
+  it('parses YYYY-MM-DD as UTC midnight, not local midnight', () => {
+    const date = parseCalendarDate('2025-12-17');
+    expect(date.toISOString()).toBe('2025-12-17T00:00:00.000Z');
+  });
+
+  it('tolerates surrounding whitespace', () => {
+    expect(parseCalendarDate('  2024-01-15 ').toISOString()).toBe('2024-01-15T00:00:00.000Z');
+  });
+
+  it('falls back to Date parsing for anything that is not a calendar date', () => {
+    expect(parseCalendarDate('2024-01-15T10:30:00Z').toISOString()).toBe(
+      '2024-01-15T10:30:00.000Z',
+    );
+  });
+
+  it('returns an invalid Date rather than throwing on garbage', () => {
+    expect(Number.isNaN(parseCalendarDate('not a date').getTime())).toBe(true);
+  });
+});
+
+describe('formatDay', () => {
+  it('renders the calendar day from the filename regardless of host timezone', () => {
+    // Would be "Dec 16" if the UTC timeZone option were dropped and the test
+    // machine sat west of Greenwich.
+    expect(formatDay(parseCalendarDate('2025-12-17'), 'en')).toBe('Dec 17, 2025');
+  });
+
+  it('renders the same instant as the same day in Chinese', () => {
+    expect(formatDay(parseCalendarDate('2025-12-17'), 'zh')).toBe('2025年12月17日');
+  });
+
+  it('formats the UTC-midnight dates publicationsLoader builds', () => {
+    expect(formatDay(new Date(Date.UTC(2024, 0, 1)), 'en')).toBe('Jan 1, 2024');
+  });
+
+  it('echoes the input back instead of rendering "Invalid Date"', () => {
+    expect(formatDay('nonsense', 'en')).toBe('nonsense');
+  });
+});
+
+describe('formatMonth', () => {
+  it('renders year and month only', () => {
+    expect(formatMonth(parseCalendarDate('2025-12-17'), 'en')).toBe('December 2025');
+    expect(formatMonth(parseCalendarDate('2025-12-17'), 'zh')).toBe('2025年12月');
+  });
+});
+
+describe('localeOf', () => {
+  it('maps app locales to BCP 47 tags', () => {
+    expect(localeOf('zh')).toBe('zh-CN');
+    expect(localeOf('en')).toBe('en-US');
+  });
+
+  it('falls back to English for an unknown locale', () => {
+    expect(localeOf('fr')).toBe('en-US');
+  });
+});
diff --git a/test/libraryTree.test.ts b/test/libraryTree.test.ts
new file mode 100644
index 0000000..4e63292
--- /dev/null
+++ b/test/libraryTree.test.ts
@@ -0,0 +1,58 @@
+import { describe, expect, it } from 'vitest';
+import { buildLibraryTree, type TreeNode } from '../src/utils/libraryTree';
+
+const names = (node: TreeNode) => node.children.map((c) => c.name);
+
+describe('buildLibraryTree', () => {
+  it('nests entries by path segment', () => {
+    const root = buildLibraryTree([
+      { id: '词条/Git', slug: '词条/Git', title: 'Git' },
+      { id: '词条/Obsidian', slug: '词条/Obsidian', title: 'Obsidian' },
+    ]);
+    expect(names(root)).toEqual(['词条']);
+    expect(names(root.children[0])).toEqual(['Git', 'Obsidian']);
+    expect(root.children[0].isFile).toBe(false);
+    expect(root.children[0].children[0].isFile).toBe(true);
+  });
+
+  it('carries the full path on every node, so a node can build its own href', () => {
+    const root = buildLibraryTree([{ id: 'a/b/c', slug: 'a/b/c', title: 'C' }]);
+    expect(root.children[0].fullPath).toBe('a');
+    expect(root.children[0].children[0].fullPath).toBe('a/b');
+    expect(root.children[0].children[0].children[0].fullPath).toBe('a/b/c');
+  });
+
+  it('sorts directories before files at every level', () => {
+    const root = buildLibraryTree([
+      { id: 'zebra', slug: 'zebra', title: 'Zebra' },
+      { id: '专栏/one', slug: '专栏/one', title: 'One' },
+      { id: 'alpha', slug: 'alpha', title: 'Alpha' },
+    ]);
+    // 专栏 is a directory, so it leads regardless of alphabetical order.
+    expect(names(root)).toEqual(['专栏', 'alpha', 'zebra']);
+  });
+
+  it('sorts numerically so Week10 follows Week9', () => {
+    const root = buildLibraryTree([
+      { id: 'w/Week10', slug: 'w/Week10', title: 'Week10' },
+      { id: 'w/Week9', slug: 'w/Week9', title: 'Week9' },
+      { id: 'w/Week1', slug: 'w/Week1', title: 'Week1' },
+    ]);
+    expect(names(root.children[0])).toEqual(['Week1', 'Week9', 'Week10']);
+  });
+
+  it('merges a directory that is also a page rather than duplicating the node', () => {
+    // 专栏/Python4Science both has children and its own index entry.
+    const root = buildLibraryTree([
+      { id: '专栏/Python', slug: '专栏/Python', title: 'Python' },
+      { id: '专栏/Python/Week1', slug: '专栏/Python/Week1', title: 'Week1' },
+    ]);
+    const column = root.children[0];
+    expect(names(column)).toEqual(['Python']);
+    expect(column.children[0].children).toHaveLength(1);
+  });
+
+  it('returns a bare root for no items', () => {
+    expect(buildLibraryTree([]).children).toEqual([]);
+  });
+});
diff --git a/test/localized.test.ts b/test/localized.test.ts
new file mode 100644
index 0000000..0acd3aa
--- /dev/null
+++ b/test/localized.test.ts
@@ -0,0 +1,160 @@
+import { describe, expect, it } from 'vitest';
+import {
+  isTranslation,
+  pickLocalized,
+  pickLocalizedList,
+  resolveLocalized,
+  splitTranslationId,
+  translationIndex,
+} from '../src/utils/localized';
+
+describe('splitTranslationId', () => {
+  it('recognises a translation suffix', () => {
+    expect(splitTranslationId('song-shuang.en')).toEqual({
+      baseId: 'song-shuang',
+      lang: 'en',
+    });
+  });
+
+  it('leaves a base id alone', () => {
+    expect(splitTranslationId('song-shuang')).toEqual({ baseId: 'song-shuang' });
+  });
+
+  it('handles nested paths, which library ids are', () => {
+    expect(splitTranslationId('词条/Git.en')).toEqual({ baseId: '词条/Git', lang: 'en' });
+  });
+
+  it('does not mistake a dot in a name for a locale suffix', () => {
+    expect(splitTranslationId('v1.2-notes')).toEqual({ baseId: 'v1.2-notes' });
+    expect(isTranslation('v1.2-notes')).toBe(false);
+  });
+});
+
+describe('pickLocalized', () => {
+  const person = { name: '宋爽', name_en: 'Shuang Song', role: '研究组长' };
+
+  it('returns the translation for en', () => {
+    expect(pickLocalized(person, 'name', 'en')).toBe('Shuang Song');
+  });
+
+  it('returns the base value for zh even when a translation exists', () => {
+    expect(pickLocalized(person, 'name', 'zh')).toBe('宋爽');
+  });
+
+  it('falls back to the base language when the translation is absent', () => {
+    // A field with no English is the normal state of a vault mid-translation.
+    // The reader gets Chinese, never an empty heading.
+    expect(pickLocalized(person, 'role', 'en')).toBe('研究组长');
+  });
+
+  it('treats a whitespace-only translation as absent', () => {
+    expect(pickLocalized({ name: '宋爽', name_en: '   ' }, 'name', 'en')).toBe('宋爽');
+  });
+
+  it('returns undefined when neither exists, rather than an empty string', () => {
+    expect(pickLocalized(person, 'nickname', 'en')).toBeUndefined();
+  });
+
+  it('ignores a non-string translation instead of rendering [object Object]', () => {
+    expect(pickLocalized({ name: '宋爽', name_en: { x: 1 } }, 'name', 'en')).toBe('宋爽');
+  });
+});
+
+describe('pickLocalizedList', () => {
+  const data = { interests: ['人水系统', '主体建模'], interests_en: ['Human-water systems'] };
+
+  it('returns the translated list for en', () => {
+    expect(pickLocalizedList(data, 'interests', 'en')).toEqual(['Human-water systems']);
+  });
+
+  it('falls back when the translated list is missing or empty', () => {
+    expect(pickLocalizedList({ interests: ['人水系统'] }, 'interests', 'en')).toEqual(['人水系统']);
+    expect(pickLocalizedList({ interests: ['人水系统'], interests_en: [] }, 'interests', 'en')).toEqual([
+      '人水系统',
+    ]);
+  });
+
+  it('returns an empty array rather than undefined for a missing field', () => {
+    expect(pickLocalizedList({}, 'interests', 'zh')).toEqual([]);
+  });
+});
+
+describe('translationIndex', () => {
+  const overlays = [
+    { id: '通讯录/ada.en' },
+    { id: '通讯录/ada.zh' },
+    { id: '图书馆/项目/proj.en' },
+    { id: '图书馆/词条/Git.en' },
+  ];
+
+  it('strips the collection prefix so overlays key by base id', () => {
+    const index = translationIndex(overlays, '通讯录', 'en');
+    expect([...index.keys()]).toEqual(['ada']);
+    expect(index.get('ada')?.id).toBe('通讯录/ada.en');
+  });
+
+  it('ignores overlays belonging to other collections', () => {
+    // 图书馆/项目/ sits *under* 图书馆/, so a naive prefix test would let a
+    // project overlay through as a library one.
+    const index = translationIndex(overlays, '图书馆/项目', 'en');
+    expect([...index.keys()]).toEqual(['proj']);
+  });
+
+  it('keeps nested paths, which library ids are', () => {
+    const index = translationIndex(overlays, '图书馆', 'en');
+    expect(index.has('词条/Git')).toBe(true);
+  });
+
+  it('selects only the requested locale', () => {
+    expect(translationIndex(overlays, '通讯录', 'zh').get('ada')?.id).toBe('通讯录/ada.zh');
+  });
+
+  it('tolerates a prefix given with a trailing slash', () => {
+    expect(translationIndex(overlays, '通讯录/', 'en').has('ada')).toBe(true);
+  });
+});
+
+describe('resolveLocalized', () => {
+  const entries = [{ id: 'ada' }, { id: 'bob' }];
+  const overlays = [{ id: '通讯录/ada.en' }];
+
+  it('renders the translated body for en when one exists', () => {
+    const index = translationIndex(overlays, '通讯录', 'en');
+    const [ada] = resolveLocalized(entries, 'en', index);
+    expect(ada.bodySource.id).toBe('通讯录/ada.en');
+    expect(ada.hasTranslation).toBe(true);
+  });
+
+  it('falls back to the base body and says so', () => {
+    const index = translationIndex(overlays, '通讯录', 'en');
+    const bob = resolveLocalized(entries, 'en', index)[1];
+    expect(bob.bodySource.id).toBe('bob');
+    expect(bob.hasTranslation).toBe(false);
+  });
+
+  it('never uses an English body on the Chinese route', () => {
+    const index = translationIndex(overlays, '通讯录', 'zh');
+    const [ada] = resolveLocalized(entries, 'zh', index);
+    expect(ada.bodySource.id).toBe('ada');
+    expect(ada.hasTranslation).toBe(false);
+  });
+
+  it('works with no translations at all', () => {
+    expect(resolveLocalized(entries, 'en').map((r) => r.hasTranslation)).toEqual([false, false]);
+  });
+
+  it('drops a translation that leaked into the base collection', () => {
+    // Belt and braces behind the loader exclusion globs: a leak would collide
+    // with the page it translates in getStaticPaths and fail the build.
+    const leaked = [{ id: 'ada' }, { id: 'ada.en' }];
+    expect(resolveLocalized(leaked, 'en').map((r) => r.entry.id)).toEqual(['ada']);
+  });
+
+  it('ignores an orphan overlay whose base was deleted', () => {
+    const index = translationIndex([{ id: '通讯录/gone.en' }], '通讯录', 'en');
+    expect(resolveLocalized(entries, 'en', index).map((r) => r.hasTranslation)).toEqual([
+      false,
+      false,
+    ]);
+  });
+});
diff --git a/test/publicationsLoader.test.ts b/test/publicationsLoader.test.ts
new file mode 100644
index 0000000..249bcb1
--- /dev/null
+++ b/test/publicationsLoader.test.ts
@@ -0,0 +1,155 @@
+import { describe, expect, it, vi } from 'vitest';
+import { extractBibEntries, parseBibEntry } from '../src/content/loaders/publicationsLoader';
+
+/**
+ * `extractBibEntries` is a hand-rolled brace-matching scanner and `parseBibEntry`
+ * is the field mapping over citation-js output. Both have shipped silent
+ * data-corruption bugs (see `fe09584 fix(publications): stop the loader silently
+ * corrupting entries`). Every case below pins a behaviour that was previously
+ * verified only by looking at the built site.
+ */
+
+describe('extractBibEntries', () => {
+  it('keeps the verbatim entry text, which is what the Copy BibTeX button serves', () => {
+    const bib = `@article{lovelace2024,
+  title = {A Paper},
+  year = {2024}
+}`;
+    expect(extractBibEntries(bib)).toEqual({ lovelace2024: bib });
+  });
+
+  it('separates multiple entries in one file', () => {
+    const bib = `@article{a2024, title = {A}, year = {2024}}
+
+@misc{b2023, title = {B}, year = {2023}}`;
+    const entries = extractBibEntries(bib);
+    expect(Object.keys(entries)).toEqual(['a2024', 'b2023']);
+    expect(entries.a2024).toBe('@article{a2024, title = {A}, year = {2024}}');
+    expect(entries.b2023).toBe('@misc{b2023, title = {B}, year = {2023}}');
+  });
+
+  it('does not truncate an entry at a nested closing brace', () => {
+    // The corruption mode: `{\"O}` inside a title ends the entry early, and the
+    // rest of the fields vanish with no error.
+    const bib = `@article{umlaut2024,
+  title = {Effects of {CO$_2$} on {\\"O}sterreich},
+  year = {2024}
+}`;
+    const entries = extractBibEntries(bib);
+    expect(entries.umlaut2024).toContain('year = {2024}');
+    expect(entries.umlaut2024.endsWith('}')).toBe(true);
+  });
+
+  it('ignores an unterminated final entry rather than emitting a mangled one', () => {
+    const bib = `@article{good2024, title = {Good}, year = {2024}}
+
+@article{broken2024, title = {Never closed`;
+    const entries = extractBibEntries(bib);
+    expect(entries).toHaveProperty('good2024');
+    expect(entries).not.toHaveProperty('broken2024');
+  });
+
+  it('returns an empty map for a file with no entries', () => {
+    expect(extractBibEntries('% just a comment\n')).toEqual({});
+  });
+});
+
+describe('parseBibEntry', () => {
+  const base = { title: 'A Fixture Paper', author: [{ given: 'Ada', family: 'Lovelace' }] };
+
+  it('joins structured author objects into display names', () => {
+    const result = parseBibEntry(
+      {
+        ...base,
+        author: [
+          { given: 'Ada', family: 'Lovelace' },
+          { given: 'Charles', family: 'Babbage' },
+        ],
+      },
+      'k',
+    );
+    expect(result?.authors).toEqual(['Ada Lovelace', 'Charles Babbage']);
+  });
+
+  it('splits an "and"-joined author string', () => {
+    const result = parseBibEntry({ ...base, author: 'Lovelace, Ada and Babbage, Charles' }, 'k');
+    expect(result?.authors).toEqual(['Lovelace, Ada', 'Babbage, Charles']);
+  });
+
+  it('drops an entry with no title instead of rendering a blank citation', () => {
+    expect(parseBibEntry({ author: 'Someone' }, 'k')).toBeNull();
+  });
+
+  it('leaves year undefined rather than defaulting to the current year', () => {
+    // The regression: an unparseable date became a brand-new publication at the
+    // top of the list, with no log and nothing for a reader to notice.
+    const result = parseBibEntry(base, 'turing_undated');
+    expect(result?.year).toBeUndefined();
+    expect(result?.date).toBeUndefined();
+  });
+
+  it('builds the date at UTC midnight so the year survives serialisation in UTC+8', () => {
+    const result = parseBibEntry({ ...base, year: 2024 }, 'k');
+    expect(result?.date?.toISOString()).toBe('2024-01-01T00:00:00.000Z');
+  });
+
+  it('prefers citation-js issued date-parts over a bare year field', () => {
+    const result = parseBibEntry(
+      { ...base, issued: { 'date-parts': [[2019, 5]] }, year: 1999 },
+      'k',
+    );
+    expect(result?.year).toBe(2019);
+  });
+
+  it('reads tags from `keyword` (singular), which is what citation-js emits', () => {
+    // Reading `keywords` meant tags were ALWAYS empty and the topic filter was
+    // permanently blank — a symptom once misattributed to the language filter.
+    const result = parseBibEntry({ ...base, keyword: 'Hydrology, Modelling' }, 'k');
+    expect(result?.tags).toEqual(['Hydrology', 'Modelling']);
+  });
+
+  it('still accepts plural `keywords`', () => {
+    expect(parseBibEntry({ ...base, keywords: 'Hydrology; GIS' }, 'k')?.tags).toEqual([
+      'Hydrology',
+      'GIS',
+    ]);
+  });
+
+  it('drops language names, which Zotero writes onto every record', () => {
+    const result = parseBibEntry({ ...base, keyword: 'English, 中文, Hydrology' }, 'k');
+    expect(result?.tags).toEqual(['Hydrology']);
+  });
+
+  it('prefixes a bare DOI and leaves a URL-shaped one alone', () => {
+    expect(parseBibEntry({ ...base, DOI: '10.1038/x' }, 'k')?.doi).toBe(
+      'https://doi.org/10.1038/x',
+    );
+    expect(parseBibEntry({ ...base, DOI: 'https://doi.org/10.1038/x' }, 'k')?.doi).toBe(
+      'https://doi.org/10.1038/x',
+    );
+  });
+
+  it('rejects a Zotero local file path and says so instead of dropping it silently', () => {
+    const warn = vi.fn();
+    const bibtex =
+      '@misc{k,\n  file = {Full Text:/Users/someone/Zotero/paper.pdf:application/pdf}\n}';
+    const result = parseBibEntry(base, 'k', bibtex, warn);
+    expect(result?.pdf).toBeUndefined();
+    expect(warn).toHaveBeenCalledOnce();
+    expect(warn.mock.calls[0][0]).toContain('ignoring unusable pdf/file value');
+  });
+
+  it('accepts a servable pdf value without warning', () => {
+    const warn = vi.fn();
+    const result = parseBibEntry(base, 'k', '@misc{k,\n  file = {/attachments/x.pdf}\n}', warn);
+    expect(result?.pdf).toBe('/attachments/x.pdf');
+    expect(warn).not.toHaveBeenCalled();
+  });
+
+  it('falls back through container-title, journal, booktitle, publisher for the venue', () => {
+    expect(parseBibEntry({ ...base, booktitle: 'Proc. of X' }, 'k')?.venue).toBe('Proc. of X');
+    expect(parseBibEntry({ ...base, journal: 'Nature', 'container-title': 'CT' }, 'k')?.venue).toBe(
+      'CT',
+    );
+  });
+});
diff --git a/test/render-markdown.test.ts b/test/render-markdown.test.ts
new file mode 100644
index 0000000..7bb29c6
--- /dev/null
+++ b/test/render-markdown.test.ts
@@ -0,0 +1,96 @@
+import { describe, expect, it } from 'vitest';
+import { renderMarkdown } from '../src/utils/render-markdown.js';
+
+/**
+ * This is the security boundary. News bullets are rendered by a loader and go
+ * into `dangerouslySetInnerHTML`; the vault is a *separate* repository, so
+ * write access there would mean script execution here if the allow-list broke.
+ *
+ * `fixtures/Team-Guidebook/档案馆/2024-02-20.md` is the hostile fixture these
+ * cases mirror — it was previously verified only by looking at the built site.
+ */
+
+/** A content index with one library entry, so no disk glob is needed. */
+const index = {
+  slugs: new Map([['词条/git', '词条/Git']]),
+  byBasename: new Map([['git', '词条/Git']]),
+  attachments: new Map([['sample-diagram.png', 'sample-diagram.png']]),
+  collisions: new Map(),
+};
+
+const render = (md: string) => renderMarkdown(md, { index });
+
+describe('sanitiser', () => {
+  it('never emits a script element', async () => {
+    const html = await render('Hostile: <script>alert(1)</script>');
+    expect(html).not.toContain('<script');
+    // The payload survives as inert text: remark-rehype drops raw HTML nodes
+    // before the sanitiser even sees them (no `allowDangerousHtml`), so the
+    // tags vanish and their content degrades to a text node. Defence in depth —
+    // pinned here so a future `allowDangerousHtml` would fail loudly.
+    expect(html).toBe('<p>Hostile: alert(1)</p>');
+  });
+
+  it('strips an inline event handler but keeps the element', async () => {
+    const html = await render('<img src=x onerror="alert(document.cookie)">');
+    expect(html).not.toContain('onerror');
+    expect(html).not.toContain('document.cookie');
+  });
+
+  it('removes a javascript: href', async () => {
+    const html = await render('<a href="javascript:alert(2)">click</a>');
+    expect(html).not.toContain('javascript:');
+  });
+
+  it('keeps http, https and mailto hrefs', async () => {
+    expect(await render('[x](https://example.org)')).toContain('href="https://example.org"');
+    expect(await render('[x](mailto:a@example.org)')).toContain('href="mailto:a@example.org"');
+  });
+
+  it('drops a style attribute', async () => {
+    const html = await render('<p style="position:fixed;inset:0">x</p>');
+    expect(html).not.toContain('style=');
+  });
+});
+
+describe('Obsidian syntax', () => {
+  it('resolves a wiki link by basename to a library route', async () => {
+    // `marked` rendered this as the literal text `[[Git]]`.
+    const html = await render('See [[Git]] for details.');
+    // Case is preserved: library routes use `keepPathAsId`, so the URL is the
+    // on-disk path verbatim. Lowercasing here would 404.
+    expect(html).toContain('href="/zh/library/词条/Git"');
+    expect(html).toContain('internal-link');
+  });
+
+  it('marks an unresolvable wiki link as broken rather than emitting a dead link', async () => {
+    const html = await render('See [[No Such Entry]].');
+    expect(html).toContain('internal-link-broken');
+    expect(html).not.toContain('<a href="/zh/library/no-such-entry"');
+  });
+
+  it('rewrites an image embed to the attachments path with lazy loading', async () => {
+    const html = await render('![[sample-diagram.png]]');
+    expect(html).toContain('src="/attachments/sample-diagram.png"');
+    expect(html).toContain('loading="lazy"');
+    expect(html).toContain('decoding="async"');
+  });
+
+  it('keeps the callout class through the allow-list', async () => {
+    // className is allow-listed *by value*; a regex silently allowed nothing
+    // and the callout lost its styling class.
+    const html = await render('> [!INFO] Heads up\n> body text');
+    expect(html).toContain('admonition');
+    expect(html).toContain('admonition-info');
+    expect(html).toContain('Heads up');
+  });
+});
+
+describe('remark-directive interaction', () => {
+  it('does not eat a timestamp that looks like a directive', async () => {
+    // Regression: `0092bb0 fix(markdown): stop remark-directive eating
+    // timestamps in news bullets` — `10:30` was parsed as a text directive.
+    const html = await render('Meeting at 10:30 today.');
+    expect(html).toContain('10:30');
+  });
+});
diff --git a/test/roles.test.ts b/test/roles.test.ts
new file mode 100644
index 0000000..d69657f
--- /dev/null
+++ b/test/roles.test.ts
@@ -0,0 +1,69 @@
+import { describe, expect, it } from 'vitest';
+import { ROLES, ROLE_LABELS, ROLE_TITLES, compareRoles, normalizeRole } from '../src/utils/roles';
+
+describe('normalizeRole', () => {
+  it('accepts a canonical value unchanged', () => {
+    expect(normalizeRole('phd')).toBe('phd');
+  });
+
+  it('maps the English spellings the vault already used', () => {
+    expect(normalizeRole('Professor')).toBe('pi');
+    expect(normalizeRole('Principal Investigator')).toBe('pi');
+    expect(normalizeRole('PhD Student')).toBe('phd');
+    expect(normalizeRole('Master Student')).toBe('master');
+    expect(normalizeRole('Postdoc')).toBe('postdoc');
+  });
+
+  it('maps the Chinese spellings the vault already used', () => {
+    expect(normalizeRole('教授')).toBe('pi');
+    expect(normalizeRole('博士生')).toBe('phd');
+    expect(normalizeRole('硕士生')).toBe('master');
+    expect(normalizeRole('博士后')).toBe('postdoc');
+  });
+
+  it('is insensitive to case and surrounding whitespace', () => {
+    // ' PhD Student ' used to sort to position 999 and render as its own
+    // one-person section, distinct from 'PhD Student'.
+    expect(normalizeRole('  ph.d. student  ')).toBe('phd');
+    expect(normalizeRole('POSTDOC')).toBe('postdoc');
+  });
+
+  it('falls back to `other` instead of throwing on an unrecognised title', () => {
+    // Visible in the rendered page, so the author still finds out — but the
+    // build does not die over a job title the enum had not anticipated.
+    expect(normalizeRole('Chief Vibes Officer')).toBe('other');
+  });
+
+  it('treats a missing or empty role as `other`', () => {
+    expect(normalizeRole(undefined)).toBe('other');
+    expect(normalizeRole('')).toBe('other');
+    expect(normalizeRole('   ')).toBe('other');
+  });
+});
+
+describe('ROLE_LABELS / ROLE_TITLES', () => {
+  it('has a heading and a singular title in both locales for every role', () => {
+    // Guards the failure where a new ROLES member renders as a blank heading.
+    for (const role of ROLES) {
+      expect(ROLE_LABELS[role]?.zh, `zh heading for ${role}`).toBeTruthy();
+      expect(ROLE_LABELS[role]?.en, `en heading for ${role}`).toBeTruthy();
+      expect(ROLE_TITLES[role]?.zh, `zh title for ${role}`).toBeTruthy();
+      expect(ROLE_TITLES[role]?.en, `en title for ${role}`).toBeTruthy();
+    }
+  });
+
+  it('uses a singular English title on a card where the heading is plural', () => {
+    // One person's card said "PhD Students" until these tables were split.
+    // Chinese does not pluralise, so a single table looked right in review.
+    expect(ROLE_LABELS.phd.en).toBe('PhD Students');
+    expect(ROLE_TITLES.phd.en).toBe('PhD Student');
+    expect(ROLE_TITLES.phd.zh).toBe(ROLE_LABELS.phd.zh);
+  });
+});
+
+describe('compareRoles', () => {
+  it('orders by seniority, with the catch-all last', () => {
+    const shuffled = ['other', 'phd', 'pi', 'master', 'postdoc'] as const;
+    expect([...shuffled].sort(compareRoles)).toEqual(['pi', 'postdoc', 'phd', 'master', 'other']);
+  });
+});
diff --git a/test/sidecars.test.ts b/test/sidecars.test.ts
new file mode 100644
index 0000000..8538936
--- /dev/null
+++ b/test/sidecars.test.ts
@@ -0,0 +1,77 @@
+import { describe, expect, it, vi } from 'vitest';
+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
+import { inferPublicationType, loadSidecars } from '../src/content/loaders/publicationsLoader';
+
+describe('inferPublicationType', () => {
+  it('maps the BibTeX entry types the vault uses', () => {
+    expect(inferPublicationType('@article{k, title={T}}')).toBe('journal');
+    expect(inferPublicationType('@inproceedings{k,}')).toBe('conference');
+    expect(inferPublicationType('@incollection{k,}')).toBe('chapter');
+    expect(inferPublicationType('@book{k,}')).toBe('book');
+    expect(inferPublicationType('@phdthesis{k,}')).toBe('thesis');
+  });
+
+  it('treats @misc as a preprint, which is what Zotero writes for one', () => {
+    // The distinction a reader most needs: peer-reviewed or not.
+    expect(inferPublicationType('@misc{k,}')).toBe('preprint');
+  });
+
+  it('is case-insensitive and tolerates leading whitespace', () => {
+    expect(inferPublicationType('\n  @ARTICLE{k,}')).toBe('journal');
+  });
+
+  it('falls back to `other` for an unknown or missing type', () => {
+    expect(inferPublicationType('@weirdtype{k,}')).toBe('other');
+    expect(inferPublicationType(undefined)).toBe('other');
+    expect(inferPublicationType('')).toBe('other');
+  });
+});
+
+describe('loadSidecars', () => {
+  /** Write a throwaway 精选/ directory and hand back its path. */
+  function withSidecars(files: Record<string, string>): string {
+    const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'sidecars-'));
+    for (const [name, body] of Object.entries(files)) {
+      fs.writeFileSync(path.join(dir, name), body, 'utf-8');
+    }
+    return dir;
+  }
+
+  it('joins a sidecar to its entry by citation key', () => {
+    const dir = withSidecars({
+      'zeng2023.md': '---\nbib_key: zeng2023\nhighlight: 首次量化\n---\nbody',
+    });
+    const sidecars = loadSidecars(dir, new Set(['zeng2023']));
+    expect(sidecars.get('zeng2023')?.highlight).toBe('首次量化');
+  });
+
+  it('defaults the key to the filename, so it is not written twice', () => {
+    const dir = withSidecars({ 'zeng2023.md': '---\nfeatured: true\n---\nbody' });
+    expect(loadSidecars(dir, new Set(['zeng2023'])).get('zeng2023')?.featured).toBe(true);
+  });
+
+  it('warns instead of silently ignoring a sidecar that matches no entry', () => {
+    // Otherwise an author writes a highlight, sees nothing on the site, and has
+    // no way to discover they mistyped the citation key.
+    const warn = vi.fn();
+    const dir = withSidecars({ 'typo2023.md': '---\nhighlight: x\n---' });
+    const sidecars = loadSidecars(dir, new Set(['zeng2023']), warn);
+
+    expect(sidecars.size).toBe(0);
+    expect(warn).toHaveBeenCalledOnce();
+    expect(warn.mock.calls[0][0]).toContain('typo2023');
+    expect(warn.mock.calls[0][0]).toContain('no .bib entry defines');
+  });
+
+  it('honours publish: false', () => {
+    const dir = withSidecars({ 'zeng2023.md': '---\npublish: false\nhighlight: x\n---' });
+    expect(loadSidecars(dir, new Set(['zeng2023'])).size).toBe(0);
+  });
+
+  it('returns an empty map when the directory does not exist', () => {
+    // The normal state of a vault with no featured papers yet.
+    expect(loadSidecars('/nonexistent/精选', new Set(['zeng2023'])).size).toBe(0);
+  });
+});
diff --git a/vitest.config.ts b/vitest.config.ts
new file mode 100644
index 0000000..f3fb0d5
--- /dev/null
+++ b/vitest.config.ts
@@ -0,0 +1,21 @@
+import { defineConfig } from 'vitest/config';
+
+/**
+ * Unit tests for the pure logic under src/utils/ and src/content/loaders/.
+ *
+ * Deliberately NOT using `getViteConfig` from 'astro/config': that boots the
+ * Astro integration pipeline (including the content layer and the WebGL-heavy
+ * React islands) for what are plain function tests, and it needs `.content/`
+ * to exist. Nothing tested here imports `astro:content`.
+ *
+ * Anything that does need a built site belongs in an e2e suite, not this one.
+ */
+export default defineConfig({
+  test: {
+    include: ['test/**/*.test.ts'],
+    environment: 'node',
+    // The vault fixtures are read from disk by some tests; keep the repo root
+    // as cwd so relative paths match what the loaders see at build time.
+    root: import.meta.dirname,
+  },
+});