feat: 新增'分类展开/收起'按钮

assets/style.css

@@ -626,6 +626,42 @@ body .content.expanded {
     z-index: 10;
 }
 
+/* 分类切换按钮 */
+.category-toggle {
+    position: fixed;
+    bottom: 5rem;
+    right: 2rem;
+    width: 40px;
+    height: 40px;
+    border-radius: 10px;
+    background: linear-gradient(145deg, var(--site-card-bg-gradient-1), var(--site-card-bg-gradient-2));
+    color: var(--text-bright);
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    cursor: pointer;
+    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+    z-index: 100;
+    box-shadow: 0 4px 16px var(--shadow-color);
+    border: 1px solid var(--border-color);
+}
+
+.category-toggle:hover {
+    transform: translateY(-2px);
+    background: linear-gradient(145deg, var(--secondary-bg), var(--site-card-bg-gradient-1));
+    box-shadow: 0 6px 20px var(--shadow-color);
+    color: var(--accent-color);
+}
+
+.category-toggle:active {
+    transform: translateY(0);
+    box-shadow: 0 2px 8px var(--shadow-color);
+}
+
+.category-toggle i {
+    font-size: 18px;
+}
+
 /* 搜索框 */
 .search-box {
     position: relative;
@@ -1730,6 +1766,12 @@ body .content.expanded {
         animation: glow 3s ease-in-out infinite alternate;
     }
 
+    /* 移动端分类切换按钮 */
+    .category-toggle {
+        bottom: 4rem;
+        right: 1rem;
+    }
+
     /* 分类样式优化 */
     .category {
         margin: 0 0.15rem 1.5rem 0.15rem;
@@ -1792,6 +1834,7 @@ body .content.expanded {
 }
 
 @media (max-width: 480px) {
+
     .welcome-section {
         padding: 0 1rem;
         margin-bottom: 2rem;

src/script.js

@@ -344,19 +344,60 @@ 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');
-    });
+    const activePage = document.querySelector('.page.active');
+    if (activePage) {
+        activePage.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');
-    });
+    const activePage = document.querySelector('.page.active');
+    if (activePage) {
+        activePage.querySelectorAll('.category:not(.collapsed), .group:not(.collapsed)').forEach(element => {
+            element.classList.add('collapsed');
+            saveToggleState(element, 'collapsed');
+        });
+    }
 };
 
+// 智能切换分类展开/收起状态
+window.MeNav.toggleCategories = function() {
+    const activePage = document.querySelector('.page.active');
+    if (!activePage) return;
+    
+    const allElements = activePage.querySelectorAll('.category, .group');
+    const collapsedElements = activePage.querySelectorAll('.category.collapsed, .group.collapsed');
+    
+    // 如果收起的数量 >= 总数的一半，执行展开；否则执行收起
+    if (collapsedElements.length >= allElements.length / 2) {
+        window.MeNav.expandAll();
+        updateCategoryToggleIcon('up');
+    } else {
+        window.MeNav.collapseAll();
+        updateCategoryToggleIcon('down');
+    }
+};
+
+// 更新分类切换按钮图标
+function updateCategoryToggleIcon(state) {
+    const toggleBtn = document.getElementById('category-toggle');
+    if (!toggleBtn) return;
+    
+    const icon = toggleBtn.querySelector('i');
+    if (!icon) return;
+    
+    if (state === 'up') {
+        icon.className = 'fas fa-angle-double-up';
+        toggleBtn.setAttribute('aria-label', '收起分类');
+    } else {
+        icon.className = 'fas fa-angle-double-down';
+        toggleBtn.setAttribute('aria-label', '展开分类');
+    }
+}
+
 window.MeNav.toggleCategory = function(categoryName, subcategoryName = null, groupName = null) {
     const selector = groupName
         ? `[data-name="${categoryName}"] [data-name="${subcategoryName}"] [data-name="${groupName}"]`
@@ -1446,6 +1487,16 @@ document.addEventListener('DOMContentLoaded', () => {
         // 初始化嵌套分类功能
         initializeNestedCategories();
         
+        // 初始化分类切换按钮
+        const categoryToggleBtn = document.getElementById('category-toggle');
+        if (categoryToggleBtn) {
+            categoryToggleBtn.addEventListener('click', function() {
+                window.MeNav.toggleCategories();
+            });
+        } else {
+            console.error('Category toggle button not found');
+        }
+        
         // 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());

templates/layouts/default.hbs

@@ -132,6 +132,11 @@
             {{/each}}
         </main>
 
+        <!-- 分类切换按钮 -->
+        <button class="category-toggle" id="category-toggle" aria-label="展开/收起分类">
+            <i class="fas fa-angle-double-down"></i>
+        </button>
+
         <!-- 主题切换按钮 -->
         <button class="theme-toggle" aria-label="切换主题">
             <i class="fas fa-moon"></i>