diff --git a/apps/docs/src/components/Shell.tsx b/apps/docs/src/components/Shell.tsx
index 08f416f..665ea7b 100644
--- a/apps/docs/src/components/Shell.tsx
+++ b/apps/docs/src/components/Shell.tsx
@@ -29,7 +29,10 @@ export function Navigation({
   current?: string;
   onNavigate?: () => void;
 }) {
-  const groups = [...new Set(docs.map((d) => d.group))];
+  const collection = docs.find((d) => d.slug === current)?.collection;
+  const scopedDocs = docs.filter((d) => d.collection === collection);
+  const groups = [...new Set(scopedDocs.map((d) => d.group))];
+  const collections = [...new Set(docs.map((d) => d.collection))];
   return (
     <nav aria-label="文档导航">
       <Link
@@ -39,10 +42,21 @@ export function Navigation({
       >
         <Icon name="book" size={17} /> <span>资料库</span>
       </Link>
+      {!current && collections.map((name) => (
+        <Link
+          onClick={onNavigate}
+          className="nav-item"
+          href={`/docs/${docs.find((d) => d.collection === name)!.slug}`}
+          key={name}
+        >
+          {name}
+        </Link>
+      ))}
+      {collection && !groups.includes(collection) && <p className="eyebrow">{collection}</p>}
       {groups.map((group) => (
         <div className="nav-group" key={group}>
           <p>{group}</p>
-          {docs
+          {scopedDocs
             .filter((d) => d.group === group)
             .map((d) => (
               <Link
@@ -81,7 +95,9 @@ export function Shell({
   const [searchStatus, setSearchStatus] = useState("");
   const [selected, setSelected] = useState(0);
   const [menu, setMenu] = useState(false);
+  const collection = docs.find((d) => d.slug === current)?.collection;
   const results = searchDocs.filter((d) =>
+    (!collection || d.collection === collection) &&
     `${d.title} ${d.description} ${d.searchText ?? ""}`
       .toLocaleLowerCase()
       .includes(query.trim().toLocaleLowerCase()),
diff --git a/apps/docs/src/lib/docs.ts b/apps/docs/src/lib/docs.ts
index 2c013ee..cdad31d 100644
--- a/apps/docs/src/lib/docs.ts
+++ b/apps/docs/src/lib/docs.ts
@@ -4,7 +4,7 @@ import catalog from "../../../../content/catalog.json";
 
 const directory = path.resolve(process.cwd(), "../../content/docs");
 const validSlug = /^[a-z0-9]+(?:-[a-z0-9]+)*(?:\/[a-z0-9]+(?:-[a-z0-9]+)*)*$/;
-type Metadata = { group?: string; description?: string; draft?: boolean; featured?: boolean };
+type Metadata = { collection?: string; group?: string; description?: string; draft?: boolean; featured?: boolean };
 export type DocLink = {
   slug: string; title: string; searchText?: string;
   group: string; collection: string; description: string; draft: boolean; featured: boolean;
@@ -18,7 +18,7 @@ export async function readDoc(slug: string): Promise<Doc> {
   const collection = catalog.collections.find((c) => !c.path || slug.startsWith(`${c.path}/`))!;
   const metadata: Metadata = (catalog.documents as Record<string, Metadata>)[slug] ?? {};
   return { slug, title, content, searchText: content,
-    group: metadata.group ?? collection.title, collection: collection.title,
+    group: metadata.group ?? collection.title, collection: metadata.collection ?? collection.title,
     description: metadata.description ?? collection.description,
     draft: metadata.draft ?? false, featured: metadata.featured ?? false,
   };
diff --git a/content/catalog.json b/content/catalog.json
index 707946a..f381415 100644
--- a/content/catalog.json
+++ b/content/catalog.json
@@ -42,6 +42,7 @@
       "draft": true
     },
     "05-object-graphs-gc": {
+      "collection": "对象关系与垃圾回收",
       "group": "运行时基础",
       "description": "从对象引用环到标记清除、分代回收与跨代引用，记录内存管理讨论。"
     },