diff --git a/assets/style.css b/assets/style.css
index a8d5c1d..6464246 100644
--- a/assets/style.css
+++ b/assets/style.css
@@ -892,6 +892,205 @@ body .content.expanded {
     font-size: 1.3rem;
 }
 
+/* 多层级嵌套样式 */
+/* 层级2: 子分类 */
+.category-level-2 {
+    margin: 1.5rem 0 1.5rem 2rem;
+    padding: 1.5rem;
+    background: linear-gradient(145deg,
+        rgba(var(--card-bg-rgb), 0.8),
+        rgba(var(--card-bg-rgb), 0.6));
+    border-left: 3px solid var(--accent-color);
+    border-radius: 12px;
+    width: calc(100% - 3.5rem);
+}
+
+.category-level-2 .category-header h3 {
+    font-size: 1.1rem;
+    margin-bottom: 1rem;
+    color: var(--text-bright);
+    display: flex;
+    align-items: center;
+    gap: 0.6rem;
+    letter-spacing: 0.2px;
+}
+
+.category-level-2 .category-header h3 i {
+    color: var(--accent-color);
+    font-size: 1.2rem;
+}
+
+/* 层级3: 分组 */
+.group-level-3, .category-level-3 {
+    margin: 1rem 0 1rem 1.5rem;
+    padding: 1rem;
+    background: rgba(var(--card-bg-rgb), 0.4);
+    border-left: 2px solid var(--secondary-color);
+    border-radius: 8px;
+    width: calc(100% - 2.5rem);
+}
+
+.group-level-3 .group-header h4,
+.category-level-3 .category-header h4 {
+    font-size: 1rem;
+    margin-bottom: 0.8rem;
+    color: var(--text-bright);
+    display: flex;
+    align-items: center;
+    gap: 0.5rem;
+    letter-spacing: 0.2px;
+}
+
+.group-level-3 .group-header h4 i,
+.category-level-3 .category-header h4 i {
+    color: var(--secondary-color);
+    font-size: 1.1rem;
+}
+
+/* 层级4: 更深层次的分组 */
+.group-level-4, .category-level-4 {
+    margin: 0.8rem 0 0.8rem 1rem;
+    padding: 0.8rem;
+    background: rgba(var(--card-bg-rgb), 0.2);
+    border-left: 1px solid var(--tertiary-color);
+    border-radius: 6px;
+    width: calc(100% - 1.8rem);
+}
+
+.group-level-4 .group-header h5,
+.category-level-4 .category-header h5 {
+    font-size: 0.95rem;
+    margin-bottom: 0.6rem;
+    color: var(--text-bright);
+    display: flex;
+    align-items: center;
+    gap: 0.4rem;
+    letter-spacing: 0.1px;
+}
+
+.group-level-4 .group-header h5 i,
+.category-level-4 .category-header h5 i {
+    color: var(--tertiary-color);
+    font-size: 1rem;
+}
+
+/* 切换图标样式 */
+.toggle-icon {
+    display: inline-block;
+    margin-left: auto;
+    transition: transform 0.3s ease;
+    color: var(--text-muted);
+    font-size: 0.9rem;
+}
+
+.category-header:hover .toggle-icon,
+.group-header:hover .toggle-icon {
+    color: var(--accent-color);
+}
+
+/* 展开/折叠动画 */
+.category-content, .group-content {
+    overflow: hidden;
+    transition: max-height 0.3s ease, opacity 0.3s ease;
+    max-height: 9999px;
+    opacity: 1;
+}
+
+.category.collapsed .category-content,
+.group.collapsed .group-content {
+    max-height: 0;
+    opacity: 0;
+}
+
+.category.collapsed .toggle-icon i,
+.group.collapsed .toggle-icon i {
+    transform: rotate(-90deg);
+}
+
+/* 空内容提示 */
+.empty-content {
+    color: var(--text-muted);
+    font-style: italic;
+    text-align: center;
+    padding: 1rem;
+    font-size: 0.9rem;
+}
+
+/* 子容器样式 */
+.subcategories-container,
+.groups-container {
+    width: 100%;
+}
+
+/* 确保嵌套的网站网格正确显示 */
+.category-level-2 .sites-grid,
+.group-level-3 .sites-grid,
+.category-level-3 .sites-grid,
+.group-level-4 .sites-grid,
+.category-level-4 .sites-grid {
+    margin-top: 0.8rem;
+    gap: 0.8rem;
+    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
+}
+
+/* 响应式设计 - 嵌套结构 */
+@media (max-width: 768px) {
+    .category-level-2 {
+        margin-left: 1rem;
+        padding: 1rem;
+        width: calc(100% - 2rem);
+    }
+    
+    .group-level-3, .category-level-3 {
+        margin-left: 0.5rem;
+        padding: 0.8rem;
+        width: calc(100% - 1.3rem);
+    }
+    
+    .group-level-4, .category-level-4 {
+        margin-left: 0.3rem;
+        padding: 0.6rem;
+        width: calc(100% - 0.9rem);
+    }
+    
+    .category-level-2 .sites-grid,
+    .group-level-3 .sites-grid,
+    .category-level-3 .sites-grid,
+    .group-level-4 .sites-grid,
+    .category-level-4 .sites-grid {
+        grid-template-columns: repeat(2, minmax(0, 1fr));
+        gap: 0.6rem;
+    }
+}
+
+@media (max-width: 480px) {
+    .category {
+        margin-left: 1rem;
+        padding: 1.5rem;
+    }
+    
+    .category-level-2, .group-level-3, .category-level-3 {
+        margin-left: 0.5rem;
+        padding: 0.8rem;
+        width: calc(100% - 1rem);
+    }
+    
+    .group-level-4, .category-level-4 {
+        margin-left: 0.3rem;
+        padding: 0.6rem;
+        width: calc(100% - 0.6rem);
+    }
+    
+    .category-level-2 .sites-grid,
+    .group-level-3 .sites-grid,
+    .category-level-3 .sites-grid,
+    .group-level-4 .sites-grid,
+    .category-level-4 .sites-grid {
+        grid-template-columns: repeat(2, minmax(0, 1fr));
+        gap: 0.5rem;
+    }
+}
+
 /* 网站卡片网格 */
 .sites-grid {
     display: grid;
diff --git a/config/_default/pages/bookmarks-four-level.yml b/config/_default/pages/bookmarks-four-level.yml
new file mode 100644
index 0000000..2b4333c
--- /dev/null
+++ b/config/_default/pages/bookmarks-four-level.yml
@@ -0,0 +1,313 @@
+# 四层级嵌套书签配置示例
+# 展示分类 -> 子分类 -> 分组 -> 网站的四层结构
+# 说明：该页面通常由“书签导入工具”自动生成，手工修改时请保持字段结构一致。
+title: 我的书签
+subtitle: 从浏览器导入的书签收藏
+
+# 指定使用的模板文件名，现有页面模板可见 templates/pages（不含 .hbs）
+template: bookmarks
+
+categories:
+  - name: '技术资源'
+    icon: 'fas fa-laptop-code'
+    subcategories:
+      - name: '前端开发'
+        icon: 'fas fa-code'
+        groups:
+          - name: '框架库'
+            icon: 'fas fa-cube'
+            sites:
+              - name: 'React'
+                url: 'https://reactjs.org/'
+                icon: 'fab fa-react'
+                description: 'React官方文档'
+              - name: 'Vue.js'
+                url: 'https://vuejs.org/'
+                icon: 'fab fa-vuejs'
+                description: 'Vue.js官方文档'
+              - name: 'Angular'
+                url: 'https://angular.io/'
+                icon: 'fab fa-angular'
+                description: 'Angular官方文档'
+              - name: 'Svelte'
+                url: 'https://svelte.dev/'
+                icon: 'fas fa-fire'
+                description: 'Svelte官方文档'
+          - name: '状态管理'
+            icon: 'fas fa-database'
+            sites:
+              - name: 'Redux'
+                url: 'https://redux.js.org/'
+                icon: 'fas fa-database'
+                description: 'Redux状态管理'
+              - name: 'Vuex'
+                url: 'https://vuex.vuejs.org/'
+                icon: 'fas fa-database'
+                description: 'Vue状态管理'
+              - name: 'MobX'
+                url: 'https://mobx.js.org/'
+                icon: 'fas fa-react'
+                description: '响应式状态管理'
+          - name: '构建工具'
+            icon: 'fas fa-tools'
+            sites:
+              - name: 'Webpack'
+                url: 'https://webpack.js.org/'
+                icon: 'fas fa-cube'
+                description: '模块打包工具'
+              - name: 'Vite'
+                url: 'https://vitejs.dev/'
+                icon: 'fas fa-bolt'
+                description: '下一代前端构建工具'
+              - name: 'Rollup'
+                url: 'https://rollupjs.org/'
+                icon: 'fas fa-compress'
+                description: '模块打包器'
+      - name: '后端开发'
+        icon: 'fas fa-server'
+        groups:
+          - name: 'Node.js生态'
+            icon: 'fab fa-node-js'
+            sites:
+              - name: 'Express'
+                url: 'https://expressjs.com/'
+                icon: 'fas fa-server'
+                description: 'Node.js Web框架'
+              - name: 'Koa'
+                url: 'https://koajs.com/'
+                icon: 'fas fa-leaf'
+                description: '下一代Node.js框架'
+              - name: 'NestJS'
+                url: 'https://nestjs.com/'
+                icon: 'fas fa-home'
+                description: 'Node.js企业级框架'
+          - name: 'Python框架'
+            icon: 'fab fa-python'
+            sites:
+              - name: 'Django'
+                url: 'https://www.djangoproject.com/'
+                icon: 'fas fa-python'
+                description: 'Python Web框架'
+              - name: 'Flask'
+                url: 'https://flask.palletsprojects.com/'
+                icon: 'fas fa-flask'
+                description: 'Python微框架'
+              - name: 'FastAPI'
+                url: 'https://fastapi.tiangolo.com/'
+                icon: 'fas fa-bolt'
+                description: '现代Python Web框架'
+          - name: '数据库ORM'
+            icon: 'fas fa-database'
+            sites:
+              - name: 'Prisma'
+                url: 'https://www.prisma.io/'
+                icon: 'fas fa-database'
+                description: '下一代数据库工具'
+              - name: 'TypeORM'
+                url: 'https://typeorm.io/'
+                icon: 'fas fa-database'
+                description: 'TypeScript ORM'
+              - name: 'SQLAlchemy'
+                url: 'https://www.sqlalchemy.org/'
+                icon: 'fas fa-database'
+                description: 'Python SQL工具包'
+
+  - name: '设计资源'
+    icon: 'fas fa-palette'
+    subcategories:
+      - name: 'UI设计工具'
+        icon: 'fas fa-paint-brush'
+        groups:
+          - name: '原型设计'
+            icon: 'fas fa-drafting-compass'
+            sites:
+              - name: 'Figma'
+                url: 'https://www.figma.com/'
+                icon: 'fab fa-figma'
+                description: '协作式UI设计工具'
+              - name: 'Sketch'
+                url: 'https://www.sketch.com/'
+                icon: 'fab fa-sketch'
+                description: 'Mac平台UI设计工具'
+              - name: 'Adobe XD'
+                url: 'https://www.adobe.com/products/xd.html'
+                icon: 'fab fa-adobe'
+                description: 'Adobe UI设计工具'
+          - name: '设计系统'
+            icon: 'fas fa-th-large'
+            sites:
+              - name: 'Ant Design'
+                url: 'https://ant.design/'
+                icon: 'fas fa-th'
+                description: '企业级UI设计语言'
+              - name: 'Material Design'
+                url: 'https://material.io/design'
+                icon: 'fas fa-cube'
+                description: 'Google设计系统'
+              - name: 'Bootstrap'
+                url: 'https://getbootstrap.com/'
+                icon: 'fab fa-bootstrap'
+                description: '响应式CSS框架'
+          - name: '交互设计'
+            icon: 'fas fa-hand-pointer'
+            sites:
+              - name: 'Principle'
+                url: 'https://principleformac.com/'
+                icon: 'fas fa-magic'
+                description: '交互设计工具'
+              - name: 'Framer'
+                url: 'https://www.framer.com/'
+                icon: 'fas fa-mobile-alt'
+                description: '交互式设计工具'
+              - name: 'ProtoPie'
+                url: 'https://www.protopie.io/'
+                icon: 'fas fa-chart-pie'
+                description: '原型制作工具'
+      - name: '视觉资源'
+        icon: 'fas fa-image'
+        groups:
+          - name: '图标库'
+            icon: 'fas fa-icons'
+            sites:
+              - name: 'Font Awesome'
+                url: 'https://fontawesome.com/'
+                icon: 'fab fa-font-awesome'
+                description: '图标库'
+              - name: 'Iconfont'
+                url: 'https://www.iconfont.cn/'
+                icon: 'fas fa-icons'
+                description: '阿里巴巴图标库'
+              - name: 'Feather Icons'
+                url: 'https://feathericons.com/'
+                icon: 'fas fa-feather'
+                description: '简洁的图标库'
+          - name: '插画资源'
+            icon: 'fas fa-paint-brush'
+            sites:
+              - name: 'UnDraw'
+                url: 'https://undraw.co/'
+                icon: 'fas fa-palette'
+                description: '开源插画库'
+              - name: 'Illustrations.co'
+                url: 'https://illustrations.co/'
+                icon: 'fas fa-image'
+                description: '插画资源'
+              - name: 'Storyset'
+                url: 'https://storyset.com/'
+                icon: 'fas fa-book'
+                description: '动画插画库'
+          - name: '配色方案'
+            icon: 'fas fa-palette'
+            sites:
+              - name: 'Coolors'
+                url: 'https://coolors.co/'
+                icon: 'fas fa-palette'
+                description: '在线配色方案生成器'
+              - name: 'Adobe Color'
+                url: 'https://color.adobe.com/'
+                icon: 'fab fa-adobe'
+                description: 'Adobe配色工具'
+              - name: 'Paletton'
+                url: 'https://paletton.com/'
+                icon: 'fas fa-palette'
+                description: '配色方案设计工具'
+
+  - name: '开发工具'
+    icon: 'fas fa-tools'
+    subcategories:
+      - name: '编程工具'
+        icon: 'fas fa-code'
+        groups:
+          - name: '代码编辑器'
+            icon: 'fas fa-code'
+            sites:
+              - name: 'Visual Studio Code'
+                url: 'https://code.visualstudio.com/'
+                icon: 'fas fa-code'
+                description: '微软代码编辑器'
+              - name: 'Sublime Text'
+                url: 'https://www.sublimetext.com/'
+                icon: 'fas fa-file-code'
+                description: '轻量级代码编辑器'
+              - name: 'WebStorm'
+                url: 'https://www.jetbrains.com/webstorm/'
+                icon: 'fab fa-js'
+                description: 'JetBrains前端IDE'
+          - name: '版本控制'
+            icon: 'fas fa-code-branch'
+            sites:
+              - name: 'GitHub'
+                url: 'https://github.com/'
+                icon: 'fab fa-github'
+                description: '代码托管平台'
+              - name: 'GitLab'
+                url: 'https://gitlab.com/'
+                icon: 'fab fa-gitlab'
+                description: 'Git代码管理平台'
+              - name: 'Bitbucket'
+                url: 'https://bitbucket.org/'
+                icon: 'fab fa-bitbucket'
+                description: 'Atlassian代码托管'
+          - name: '调试工具'
+            icon: 'fas fa-bug'
+            sites:
+              - name: 'Chrome DevTools'
+                url: 'https://developers.google.com/web/tools/chrome-devtools'
+                icon: 'fab fa-chrome'
+                description: 'Chrome开发者工具'
+              - name: 'Firefox DevTools'
+                url: 'https://developer.mozilla.org/en-US/docs/Tools'
+                icon: 'fab fa-firefox'
+                description: 'Firefox开发者工具'
+              - name: 'Postman'
+                url: 'https://www.postman.com/'
+                icon: 'fas fa-paper-plane'
+                description: 'API测试工具'
+      - name: '部署运维'
+        icon: 'fas fa-server'
+        groups:
+          - name: '云服务'
+            icon: 'fas fa-cloud'
+            sites:
+              - name: 'AWS'
+                url: 'https://aws.amazon.com/'
+                icon: 'fab fa-aws'
+                description: '亚马逊云服务'
+              - name: 'Azure'
+                url: 'https://azure.microsoft.com/'
+                icon: 'fab fa-microsoft'
+                description: '微软云服务'
+              - name: 'Google Cloud'
+                url: 'https://cloud.google.com/'
+                icon: 'fab fa-google'
+                description: '谷歌云服务'
+          - name: '容器化'
+            icon: 'fas fa-cube'
+            sites:
+              - name: 'Docker'
+                url: 'https://www.docker.com/'
+                icon: 'fab fa-docker'
+                description: '容器化平台'
+              - name: 'Kubernetes'
+                url: 'https://kubernetes.io/'
+                icon: 'fas fa-dharmachakra'
+                description: '容器编排系统'
+              - name: 'Podman'
+                url: 'https://podman.io/'
+                icon: 'fas fa-cube'
+                description: '无守护进程容器引擎'
+          - name: 'CI/CD'
+            icon: 'fas fa-infinity'
+            sites:
+              - name: 'GitHub Actions'
+                url: 'https://github.com/features/actions'
+                icon: 'fab fa-github'
+                description: 'GitHub自动化工具'
+              - name: 'Jenkins'
+                url: 'https://www.jenkins.io/'
+                icon: 'fas fa-infinity'
+                description: '开源自动化服务器'
+              - name: 'GitLab CI'
+                url: 'https://docs.gitlab.com/ee/ci/'
+                icon: 'fab fa-gitlab'
+                description: 'GitLab CI/CD工具'
\ No newline at end of file
diff --git a/config/_default/site.yml b/config/_default/site.yml
index d822cfd..fc119bb 100644
--- a/config/_default/site.yml
+++ b/config/_default/site.yml
@@ -69,3 +69,6 @@ navigation:
   - name: 书签
     icon: fas fa-bookmark
     id: bookmarks
+  - name: 书签(多层级)
+    icon: fas fa-bookmark
+    id: bookmarks-four-level
diff --git a/src/bookmark-processor.js b/src/bookmark-processor.js
index 1ee33cd..e42853d 100644
--- a/src/bookmark-processor.js
+++ b/src/bookmark-processor.js
@@ -103,11 +103,10 @@ function getLatestBookmarkFile() {
   }
 }
 
-// 解析书签HTML内容
+// 解析书签HTML内容，支持2-4层级嵌套结构
 function parseBookmarks(htmlContent) {
-  // 简单的正则表达式匹配方法解析书签文件
-  // 注意：这是一个简化实现，可能不适用于所有浏览器的书签格式
-  const folderRegex = /<DT><H3[^>]*>(.*?)<\/H3>/g;
+  // 正则表达式匹配文件夹和书签
+  const folderRegex = /<DT><H3([^>]*)>(.*?)<\/H3>/g;
   const bookmarkRegex = /<DT><A HREF="([^"]+)"[^>]*>(.*?)<\/A>/g;
   
   // 储存解析结果
@@ -115,31 +114,89 @@ function parseBookmarks(htmlContent) {
     categories: []
   };
   
-  // 提取文件夹
-  let match;
-  let folderMatches = [];
-  while ((match = folderRegex.exec(htmlContent)) !== null) {
-    folderMatches.push({
-      index: match.index,
-      name: match[1].trim(),
-      end: match.index + match[0].length
-    });
+  // 递归解析嵌套文件夹
+  function parseNestedFolder(htmlContent, parentPath = [], level = 1) {
+    const folders = [];
+    let match;
+    
+    // 使用正则表达式匹配文件夹
+    folderRegex.lastIndex = 0;
+    
+    while ((match = folderRegex.exec(htmlContent)) !== null) {
+      const folderName = match[2].trim();
+      const folderStart = match.index;
+      const folderEnd = match.index + match[0].length;
+      
+      // 查找文件夹的结束位置
+      let folderContentEnd = htmlContent.length;
+      let depth = 1;
+      let pos = folderEnd;
+      
+      while (pos < htmlContent.length && depth > 0) {
+        const dlStart = htmlContent.substring(pos).match(/<DL><p>/gi);
+        const dlEnd = htmlContent.substring(pos).match(/<\/DL><p>/gi);
+        
+        if (dlStart && dlStart.index < (dlEnd ? dlEnd.index : htmlContent.length)) {
+          depth++;
+          pos += dlStart.index + dlStart[0].length;
+        } else if (dlEnd) {
+          depth--;
+          pos += dlEnd.index + dlEnd[0].length;
+        } else {
+          break;
+        }
+      }
+      
+      folderContentEnd = pos;
+      const folderContent = htmlContent.substring(folderEnd, folderContentEnd);
+      
+      // 解析文件夹内容
+      const folder = {
+        name: folderName,
+        icon: 'fas fa-folder',
+        path: [...parentPath, folderName]
+      };
+      
+      // 检查是否包含子文件夹
+      const hasSubfolders = folderRegex.test(folderContent);
+      folderRegex.lastIndex = 0;
+      
+      if (hasSubfolders && level < 4) {
+        // 递归解析子文件夹
+        const subfolders = parseNestedFolder(folderContent, folder.path, level + 1);
+        
+        // 根据层级深度决定数据结构
+        if (level === 1) {
+          folder.subcategories = subfolders;
+        } else if (level === 2) {
+          folder.groups = subfolders;
+        } else if (level === 3) {
+          // 层级3直接解析书签
+          folder.sites = parseSitesInFolder(folderContent);
+        }
+      } else {
+        // 解析书签
+        folder.sites = parseSitesInFolder(folderContent);
+      }
+      
+      // 只添加包含内容的文件夹
+      const hasContent = folder.sites && folder.sites.length > 0 ||
+                        folder.subcategories && folder.subcategories.length > 0 ||
+                        folder.groups && folder.groups.length > 0;
+      
+      if (hasContent) {
+        folders.push(folder);
+      }
+    }
+    
+    return folders;
   }
   
-  // 对每个文件夹，提取其中的书签
-  for (let i = 0; i < folderMatches.length; i++) {
-    const folder = folderMatches[i];
-    const nextFolder = folderMatches[i + 1];
-    
-    // 确定当前文件夹的内容范围
-    const folderContent = nextFolder 
-      ? htmlContent.substring(folder.end, nextFolder.index)
-      : htmlContent.substring(folder.end);
-    
-    // 从文件夹内容中提取书签
+  // 解析文件夹中的书签
+  function parseSitesInFolder(folderContent) {
     const sites = [];
     let bookmarkMatch;
-    bookmarkRegex.lastIndex = 0; // 重置regex索引
+    bookmarkRegex.lastIndex = 0;
     
     while ((bookmarkMatch = bookmarkRegex.exec(folderContent)) !== null) {
       const url = bookmarkMatch[1];
@@ -162,16 +219,12 @@ function parseBookmarks(htmlContent) {
       });
     }
     
-    // 只添加包含书签的文件夹
-    if (sites.length > 0) {
-      bookmarks.categories.push({
-        name: folder.name,
-        icon: 'fas fa-folder', // 默认使用文件夹图标
-        sites: sites
-      });
-    }
+    return sites;
   }
   
+  // 开始解析
+  bookmarks.categories = parseNestedFolder(htmlContent);
+  
   return bookmarks;
 }
 
diff --git a/src/generator.js b/src/generator.js
index 930a147..c6689b6 100644
--- a/src/generator.js
+++ b/src/generator.js
@@ -196,7 +196,21 @@ function safeLoadYamlConfig(filePath) {
 
   try {
     const fileContent = fs.readFileSync(filePath, 'utf8');
-    return yaml.load(fileContent);
+    // 使用 loadAll 而不是 load 来支持多文档 YAML 文件
+    const docs = yaml.loadAll(fileContent);
+    
+    // 如果只有一个文档，直接返回
+    if (docs.length === 1) {
+      return docs[0];
+    }
+    
+    // 如果有多个文档，返回第一个文档（忽略后面的文档）
+    if (docs.length > 1) {
+      console.warn(`Warning: Multiple documents found in ${filePath}. Using the first document only.`);
+      return docs[0];
+    }
+    
+    return null;
   } catch (error) {
     handleConfigLoadError(filePath, error);
     return null;
diff --git a/src/helpers/utils.js b/src/helpers/utils.js
index 0bd9128..47ca280 100644
--- a/src/helpers/utils.js
+++ b/src/helpers/utils.js
@@ -181,6 +181,19 @@ function encodeURIComponentHelper(text) {
   }
 }
 
+/**
+ * 数学加法运算助手函数
+ * @param {number} a 第一个数
+ * @param {number} b 第二个数
+ * @returns {number} 两数之和
+ * @example {{add level 1}}
+ */
+function add(a, b) {
+  const numA = parseInt(a, 10) || 0;
+  const numB = parseInt(b, 10) || 0;
+  return numA + numB;
+}
+
 // 导出所有工具类助手函数
 module.exports = {
   slice,
@@ -191,5 +204,6 @@ module.exports = {
   range,
   pick,
   keys,
-  encodeURIComponent: encodeURIComponentHelper
+  encodeURIComponent: encodeURIComponentHelper,
+  add
 };
diff --git a/src/script.js b/src/script.js
index 7be3d4c..0ae6af9 100644
--- a/src/script.js
+++ b/src/script.js
@@ -342,6 +342,137 @@ window.MeNav = {
     }
 };
 
+// 多层级嵌套书签功能
+window.MeNav.expandAll = function() {
+    document.querySelectorAll('.category.collapsed, .group.collapsed').forEach(element => {
+        element.classList.remove('collapsed');
+        saveToggleState(element, 'expanded');
+    });
+};
+
+window.MeNav.collapseAll = function() {
+    document.querySelectorAll('.category:not(.collapsed), .group:not(.collapsed)').forEach(element => {
+        element.classList.add('collapsed');
+        saveToggleState(element, 'collapsed');
+    });
+};
+
+window.MeNav.toggleCategory = function(categoryName, subcategoryName = null, groupName = null) {
+    const selector = groupName
+        ? `[data-name="${categoryName}"] [data-name="${subcategoryName}"] [data-name="${groupName}"]`
+        : subcategoryName
+            ? `[data-name="${categoryName}"] [data-name="${subcategoryName}"]`
+            : `[data-name="${categoryName}"]`;
+            
+    const element = document.querySelector(selector);
+    if (element) {
+        toggleNestedElement(element);
+    }
+};
+
+window.MeNav.getNestedStructure = function() {
+    // 返回完整的嵌套结构数据
+    const categories = [];
+    document.querySelectorAll('.category-level-1').forEach(cat => {
+        categories.push(extractNestedData(cat));
+    });
+    return categories;
+};
+
+// 切换嵌套元素
+function toggleNestedElement(container) {
+    const isCollapsed = container.classList.contains('collapsed');
+    
+    if (isCollapsed) {
+        container.classList.remove('collapsed');
+        saveToggleState(container, 'expanded');
+    } else {
+        container.classList.add('collapsed');
+        saveToggleState(container, 'collapsed');
+    }
+    
+    // 触发自定义事件
+    const event = new CustomEvent('nestedToggle', {
+        detail: {
+            element: container,
+            type: container.dataset.type,
+            name: container.dataset.name,
+            isCollapsed: !isCollapsed
+        }
+    });
+    document.dispatchEvent(event);
+}
+
+// 保存切换状态
+function saveToggleState(element, state) {
+    const type = element.dataset.type;
+    const name = element.dataset.name;
+    const level = element.dataset.level || '1';
+    const key = `menav-toggle-${type}-${level}-${name}`;
+    localStorage.setItem(key, state);
+}
+
+// 恢复切换状态
+function restoreToggleState(element) {
+    const type = element.dataset.type;
+    const name = element.dataset.name;
+    const level = element.dataset.level || '1';
+    const key = `menav-toggle-${type}-${level}-${name}`;
+    const savedState = localStorage.getItem(key);
+    
+    if (savedState === 'collapsed') {
+        element.classList.add('collapsed');
+    }
+}
+
+// 初始化嵌套分类
+function initializeNestedCategories() {
+    // 为所有可折叠元素添加切换功能
+    document.querySelectorAll('[data-toggle="category"], [data-toggle="group"]').forEach(header => {
+        header.addEventListener('click', function(e) {
+            e.stopPropagation();
+            const container = this.parentElement;
+            toggleNestedElement(container);
+        });
+        
+        // 恢复保存的状态
+        restoreToggleState(header.parentElement);
+    });
+}
+
+// 提取嵌套数据
+function extractNestedData(element) {
+    const data = {
+        name: element.dataset.name,
+        type: element.dataset.type,
+        level: element.dataset.level,
+        isCollapsed: element.classList.contains('collapsed')
+    };
+    
+    // 提取子元素数据
+    const subcategories = element.querySelectorAll(':scope > .category-content > .subcategories-container > .category');
+    if (subcategories.length > 0) {
+        data.subcategories = Array.from(subcategories).map(sub => extractNestedData(sub));
+    }
+    
+    const groups = element.querySelectorAll(':scope > .category-content > .groups-container > .group');
+    if (groups.length > 0) {
+        data.groups = Array.from(groups).map(group => extractNestedData(group));
+    }
+    
+    const sites = element.querySelectorAll(':scope > .category-content > .sites-grid > .site-card, :scope > .group-content > .sites-grid > .site-card');
+    if (sites.length > 0) {
+        data.sites = Array.from(sites).map(site => ({
+            name: site.dataset.name,
+            url: site.dataset.url,
+            icon: site.dataset.icon,
+            description: site.dataset.description
+        }));
+    }
+    
+    return data;
+}
+
 document.addEventListener('DOMContentLoaded', () => {
     // 先声明所有状态变量
     let isSearchActive = false;
@@ -1312,6 +1443,9 @@ document.addEventListener('DOMContentLoaded', () => {
             });
         });
 
+        // 初始化嵌套分类功能
+        initializeNestedCategories();
+        
         // 初始化搜索索引（使用requestIdleCallback或setTimeout延迟初始化，避免影响页面加载）
         if ('requestIdleCallback' in window) {
             requestIdleCallback(() => initSearchIndex());
diff --git a/templates/components/category.hbs b/templates/components/category.hbs
index c624cfd..97e305d 100644
--- a/templates/components/category.hbs
+++ b/templates/components/category.hbs
@@ -1,12 +1,53 @@
-<section class="category" id="{{name}}" data-type="category" data-name="{{name}}" data-icon="{{icon}}" data-container="categories">
-    <h2 data-editable="category-name"><i class="{{icon}}"></i> {{name}}</h2>
-    <div class="sites-grid" data-container="sites">
-        {{#if sites.length}}
-            {{#each sites}}
-                {{> site-card}}
-            {{/each}}
+<section class="category {{#if level}}category-level-{{level}}{{else}}category-level-1{{/if}}"
+         id="{{name}}"
+         data-type="category"
+         data-name="{{name}}"
+         data-icon="{{icon}}"
+         data-level="{{#if level}}{{level}}{{else}}1{{/if}}"
+         data-container="categories">
+    
+    <div class="category-header" data-toggle="category">
+        <h{{#if level}}{{add level 1}}{{else}}2{{/if}} data-editable="category-name">
+            <i class="{{icon}}"></i>
+            {{name}}
+            {{#if subcategories}}
+                <span class="toggle-icon">
+                    <i class="fas fa-chevron-down"></i>
+                </span>
+            {{/if}}
+            {{#if groups}}
+                <span class="toggle-icon">
+                    <i class="fas fa-chevron-down"></i>
+                </span>
+            {{/if}}
+        </h{{#if level}}{{add level 1}}{{else}}2{{/if}}>
+    </div>
+    
+    <div class="category-content">
+        {{#if subcategories}}
+            <div class="subcategories-container" data-container="subcategories">
+                {{#each subcategories}}
+                    {{> category level=2}}
+                {{/each}}
+            </div>
+        {{else if groups}}
+            <div class="groups-container" data-container="groups">
+                {{#each groups}}
+                    {{> group}}
+                {{/each}}
+            </div>
+        {{else if sites}}
+            <div class="sites-grid" data-container="sites">
+                {{#if sites.length}}
+                    {{#each sites}}
+                        {{> site-card}}
+                    {{/each}}
+                {{else}}
+                    <p class="empty-sites">暂无网站</p>
+                {{/if}}
+            </div>
         {{else}}
-            <p class="empty-sites">暂无网站</p>
+            <p class="empty-content">暂无内容</p>
         {{/if}}
     </div>
 </section>
diff --git a/templates/components/group.hbs b/templates/components/group.hbs
new file mode 100644
index 0000000..6b8dcf0
--- /dev/null
+++ b/templates/components/group.hbs
@@ -0,0 +1,32 @@
+<div class="group {{#if level}}group-level-{{level}}{{else}}group-level-3{{/if}}" 
+     data-type="group" 
+     data-name="{{name}}" 
+     data-icon="{{icon}}"
+     data-level="{{#if level}}{{level}}{{else}}3{{/if}}">
+    
+    <div class="group-header" data-toggle="group">
+        <h{{#if level}}{{add level 1}}{{else}}3{{/if}} data-editable="group-name">
+            <i class="{{icon}}"></i> 
+            {{name}}
+            <span class="toggle-icon">
+                <i class="fas fa-chevron-down"></i>
+            </span>
+        </h{{#if level}}{{add level 1}}{{else}}3{{/if}}>
+    </div>
+    
+    <div class="group-content">
+        {{#if sites}}
+            <div class="sites-grid" data-container="sites">
+                {{#if sites.length}}
+                    {{#each sites}}
+                        {{> site-card}}
+                    {{/each}}
+                {{else}}
+                    <p class="empty-sites">暂无网站</p>
+                {{/if}}
+            </div>
+        {{else}}
+            <p class="empty-content">暂无网站</p>
+        {{/if}}
+    </div>
+</div>
\ No newline at end of file