diff --git a/platform/frontend/navigation-component.js b/platform/frontend/navigation-component.js
index 200da48..20f679a 100644
--- a/platform/frontend/navigation-component.js
+++ b/platform/frontend/navigation-component.js
@@ -1,143 +1,116 @@
-// 最简导航组件 - 原生DOM操作（无h函数）
+// 纯DOM导航 - 通过 installNavigation 直接插入
 (function() {
   console.log('[Nav] 脚本加载');
 
   function injectStyles() {
     if (document.getElementById('navigation-styles')) return;
     const styles = `
-      .navigation-wrapper { position: relative; }
-      .navigation-wrapper .sidebar {
-        position: fixed; top: 60px; left: 0; bottom: 0; width: 180px;
-        background: #ffffff; padding: 12px; box-shadow: 2px 0 8px rgba(0,0,0,0.1);
-        overflow-y: auto; z-index: 99999; border-right: 1px solid #ebeef5;
-      }
+      .navigation-wrapper .sidebar { position: fixed; top: 60px; left: 0; bottom: 0; width: 180px; background: #fff; padding: 12px; box-shadow: 2px 0 8px rgba(0,0,0,0.1); overflow-y: auto; z-index: 99999; border-right: 1px solid #ebeef5; }
       .navigation-wrapper .sidebar-header { padding: 12px 8px 16px; border-bottom: 1px solid #ebeef5; margin-bottom: 12px; }
       .navigation-wrapper .sidebar-header h3 { margin: 0; font-size: 16px; font-weight: 600; color: #303133; }
-      .navigation-wrapper .sidebar-btn {
-        width: 100%; text-align: left; padding: 10px 12px; border: none; background: transparent; border-radius: 8px;
-        margin-bottom: 6px; cursor: pointer; transition: all 0.3s; color: #606266; font-size: 14px; display: flex; align-items: center; gap: 6px;
-      }
+      .navigation-wrapper .sidebar-btn { width: 100%; text-align: left; padding: 10px 12px; border: none; background: transparent; border-radius: 8px; margin-bottom: 6px; cursor: pointer; transition: all 0.3s; color: #606266; font-size: 14px; display: flex; align-items: center; gap: 6px; }
       .navigation-wrapper .sidebar-btn:hover { background: #f5f7fa; color: #409eff; }
       .navigation-wrapper .sidebar-btn.active { background: #ecf5ff; color: #409eff; font-weight: 600 !important; }
-      .navigation-wrapper .mobile-nav {
-        display: none; position: fixed; bottom: 0; left: 0; right: 0; background: #1890ff;
-        box-shadow: 0 -2px 8px rgba(0,0,0,0.2); padding: 8px 0; z-index: 99999; justify-content: space-around;
-      }
-      .navigation-wrapper .mobile-nav-btn {
-        flex: 1; border: none; background: transparent; padding: 10px 4px; text-align: center;
-        font-size: 12px; color: white !important; cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 2px;
-        transition: background 0.2s;
-      }
-      .navigation-wrapper .mobile-nav-btn:hover { background: rgba(255,255,255,0.2); color: white !important; }
+      .navigation-wrapper .mobile-nav { display: none; position: fixed; bottom: 0; left: 0; right: 0; background: #1890ff; box-shadow: 0 -2px 8px rgba(0,0,0,0.2); padding: 8px 0; z-index: 99999; justify-content: space-around; }
+      .navigation-wrapper .mobile-nav-btn { flex: 1; border: none; background: transparent; padding: 10px 4px; text-align: center; font-size: 12px; color: white !important; cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 2px; }
+      .navigation-wrapper .mobile-nav-btn:hover { background: rgba(255,255,255,0.2); }
       .navigation-wrapper .mobile-nav-btn.active { background: rgba(255,255,255,0.3); font-weight: 600 !important; }
-      @media (max-width: 768px) {
-        .navigation-wrapper .sidebar { display: none !important; }
-        .navigation-wrapper .mobile-nav { display: flex !important; }
-      }
-      @media (min-width: 769px) { .navigation-wrapper .mobile-nav { display: none !important; } }
+      @media (max-width: 768px) { .navigation-wrapper .sidebar { display: none !important; } .navigation-wrapper .mobile-nav { display: flex !important; } }
       body > #app > .main-content { margin-left: 180px !important; padding-top: 60px !important; }
       @media (max-width: 768px) { body > #app > .main-content { margin-left: 0 !important; padding-bottom: 60px !important; } }
     `;
-    const styleEl = document.createElement('style');
-    styleEl.id = 'navigation-styles';
-    styleEl.textContent = styles;
-    document.head.appendChild(styleEl);
+    document.head.appendChild(Object.assign(document.createElement('style'), { id: 'navigation-styles', textContent: styles }));
     console.log('[Nav] 样式已注入');
   }
 
-  const installNavigation = (app) => {
-    console.log('[Nav] installNavigation called');
+  function createNavigation(currentPage, isAdmin, onNavigate) {
+    const wrapper = document.createElement('div');
+    wrapper.className = 'navigation-wrapper';
+    
+    // 侧边栏
+    const sidebar = document.createElement('aside');
+    sidebar.className = 'sidebar';
+    sidebar.innerHTML = `
+      <div class="sidebar-header"><h3>宇之然平台</h3></div>
+      <nav class="sidebar-nav">
+        <button class="sidebar-btn ${currentPage==='dashboard'?'active':''}" data-page="/">📊 系统概览</button>
+        <button class="sidebar-btn ${currentPage==='topics'?'active':''}" data-page="topics.html">📋 选题管理</button>
+        <button class="sidebar-btn ${currentPage==='logs'?'active':''}" data-page="logs.html">📄 系统日志</button>
+        ${isAdmin ? `<button class="sidebar-btn ${currentPage==='users'?'active':''}" data-page="users.html">👥 用户管理</button>` : ''}
+        ${isAdmin ? `<button class="sidebar-btn ${currentPage==='admin'?'active':''}" data-page="admin.html">⚙️ 系统管理</button>` : ''}
+      </nav>
+    `;
+    
+    // 移动端底部导航
+    const mobileNav = document.createElement('nav');
+    mobileNav.className = 'mobile-nav';
+    mobileNav.innerHTML = `
+      <button class="mobile-nav-btn ${currentPage==='dashboard'?'active':''}" data-page="/">📊</button>
+      <button class="mobile-nav-btn ${currentPage==='topics'?'active':''}" data-page="topics.html">📋</button>
+      <button class="mobile-nav-btn ${currentPage==='logs'?'active':''}" data-page="logs.html">📄</button>
+      ${isAdmin ? `<button class="mobile-nav-btn ${currentPage==='users'?'active':''}" data-page="users.html">👥</button>` : ''}
+      ${isAdmin ? `<button class="mobile-nav-btn ${currentPage==='admin'?'active':''}" data-page="admin.html">⚙️</button>` : ''}
+    `;
+    
+    wrapper.appendChild(sidebar);
+    wrapper.appendChild(mobileNav);
+    
+    // 绑定点击事件
+    wrapper.querySelectorAll('button').forEach(btn => {
+      btn.addEventListener('click', () => {
+        const page = btn.getAttribute('data-page');
+        console.log('[Nav] 导航到:', page);
+        if (onNavigate) onNavigate(page);
+      });
+    });
+    
+    return wrapper;
+  }
+
+  // 新的 installNavigation 接口：接收 app 对象（为了兼容），但实际不注册组件
+  window.installNavigation = function(app, options = {}) {
+    console.log('[Nav] installNavigation called (DOM mode)');
     injectStyles();
-
-    // 定义组件选项
-    const component = {
-      name: 'NavigationComponent',
-      props: { currentPage: { type: String, required: true }, isAdmin: { type: Boolean, default: false } },
-      mounted() { 
-        console.log('[NavigationComponent] 已挂载', this.currentPage, this.isAdmin);
-        
-        // 在组件挂载后立即渲染导航栏到DOM
-        setTimeout(() => {
-          const container = this.$el; // 组件根元素
-          container.innerHTML = '';
-          
-          // 渲染侧边栏
-          const sidebar = document.createElement('aside');
-          sidebar.className = 'sidebar';
-          
-          const header = document.createElement('div');
-          header.className = 'sidebar-header';
-          const headerTitle = document.createElement('h3');
-          headerTitle.textContent = '宇之然平台';
-          header.appendChild(headerTitle);
-          
-          const nav = document.createElement('nav');
-          nav.className = 'sidebar-nav';
-          
-          const items = [
-            { icon: '📊', label: '系统概览', page: '/' },
-            { icon: '📋', label: '选题管理', page: 'topics.html' },
-            { icon: '📄', label: '系统日志', page: 'logs.html' },
-            ...(this.isAdmin ? [{ icon: '👥', label: '用户管理', page: 'users.html' }, { icon: '⚙️', label: '系统管理', page: 'admin.html' }] : [])
-          ];
-          
-          items.forEach(item => {
-            const btn = document.createElement('button');
-            btn.className = this.currentPage === (item.page === '/' ? 'dashboard' : item.page.replace('.html',''))
-              ? 'sidebar-btn active' : 'sidebar-btn';
-            btn.textContent = item.icon + ' ' + item.label;
-            
-            btn.addEventListener('click', () => {
-              console.log('[NavigationComponent] 点击导航到:', item.page);
-              this.$emit('navigate', item.page);
-            });
-            
-            nav.appendChild(btn);
-          });
-          
-          sidebar.appendChild(header);
-          sidebar.appendChild(nav);
-          container.appendChild(sidebar);
-
-          // 渲染移动端底部导航
-          if (window.innerWidth <= 768) {
-            const mobileNav = document.createElement('nav');
-            mobileNav.className = 'mobile-nav';
-            
-            const mobileItems = [
-              { icon: '📊', label: '', page: '/' },
-              { icon: '📋', label: '选题', page: 'topics.html' },
-              { icon: '📄', label: '日志', page: 'logs.html' },
-              ...(this.isAdmin ? [{ icon: '👥', label: '用户', page: 'users.html' }, { icon: '⚙️', label: '系统', page: 'admin.html' }] : [])
-            ];
-            
-            mobileItems.forEach(item => {
-              const btn = document.createElement('button');
-              btn.className = this.currentPage === (item.page === '/' ? 'dashboard' : item.page.replace('.html',''))
-                ? 'mobile-nav-btn active' : 'mobile-nav-btn';
-              
-              const content = item.label ? (item.icon + ' ' + item.label) : item.icon;
-              btn.textContent = content;
-              
-              btn.addEventListener('click', () => {
-                console.log('[NavigationComponent] 点击导航到:', item.page);
-                this.$emit('navigate', item.page);
-              });
-              
-              mobileNav.appendChild(btn);
-            });
-            
-            container.appendChild(mobileNav);
-          }
-        }, 0);
+    
+    // 延迟执行，确保DOM就绪
+    const init = () => {
+      const container = document.getElementById('app');
+      if (!container) {
+        console.warn('[Nav] #app 未找到，等待');
+        setTimeout(init, 100);
+        return;
       }
+      
+      // 尝试从 Vue 实例获取 isAdmin 和 currentPage
+      let isAdmin = false;
+      let currentPage = 'dashboard';
+      let redirectToPage = null;
+      
+      // 尝试从 Vue 实例提取数据
+      if (app && app._instance && app._instance.proxy) {
+        const proxy = app._instance.proxy;
+        if (proxy.isAdmin !== undefined) isAdmin = proxy.isAdmin;
+        if (proxy.currentPage !== undefined) currentPage = proxy.currentPage;
+        if (proxy.redirectToPage) redirectToPage = proxy.redirectToPage;
+      } else if (window.Vue && Vue.app && Vue.app._instance && Vue.app._instance.proxy) {
+        const proxy = Vue.app._instance.proxy;
+        if (proxy.isAdmin !== undefined) isAdmin = proxy.isAdmin;
+        if (proxy.currentPage !== undefined) currentPage = proxy.currentPage;
+        if (proxy.redirectToPage) redirectToPage = proxy.redirectToPage;
+      }
+      
+      // 移除旧的导航容器（如果有）
+      const oldNav = container.querySelector('.navigation-wrapper');
+      if (oldNav) oldNav.remove();
+      
+      const nav = createNavigation(currentPage, isAdmin, redirectToPage || ((page) => { window.location.href = page; }));
+      container.insertBefore(nav, container.firstChild);
+      console.log('[Nav] 导航已插入');
     };
-
-    app.component('navigation-component', component);
-    console.log('[Nav] 组件已注册');
+    
+    init();
     return app;
   };
-
-  window.installNavigation = installNavigation;
-  console.log('[Nav] 脚本已加载');
+  
+  console.log('[Nav] 脚本已加载（纯DOM版）');
 })();