.navbar-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 80px;
    }
    
    /* 品牌Logo */
    .navbar-brand {
      display: flex;
      align-items: center;
      text-decoration: none;
    }
    
    .brand-logo {
      width: 50px;
      height: 50px;
      background-color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-right: 12px;
    }
    
    .brand-logo i {
      font-size: 24px;
      color: #28a745;
    }
    
    .brand-text {
      color: white;
      font-size: 24px;
      font-weight: 700;
    }
    
    /* 导航菜单 - PC端 */
    .navbar-menu {
      display: flex;
      list-style: none;
      gap: 10px;
    }
    
    .nav-item {
      position: relative;
    }
    
    .nav-link {
      display: block;
      color: white;
      text-decoration: none;
      padding: 12px 20px;
      border-radius: 6px;
      font-weight: 600;
      font-size: 16px;
      transition: all 0.3s ease;
    }
    
    .nav-link:hover {
      background-color: rgba(255, 255, 255, 0.15);
      transform: translateY(-2px);
    }
    
    .nav-link.active {
      background-color: rgba(255, 255, 255, 0.2);
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    }
    
    /* 下拉菜单 */
    .dropdown-menu {
      position: absolute;
      top: 100%;
      left: 0;
      background-color: white;
      min-width: 180px;
      border-radius: 8px;
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
      list-style: none;
      opacity: 0;
      visibility: hidden;
      transform: translateY(10px);
      transition: all 0.3s ease;
      z-index: 1001;
    }
    
    .dropdown:hover .dropdown-menu {
      opacity: 1;
      visibility: visible;
      transform: translateY(0);
    }
    
    .dropdown-item {
      padding: 12px 20px;
      border-bottom: 1px solid #f0f0f0;
    }
    
    .dropdown-item:last-child {
      border-bottom: none;
    }
    
    .dropdown-item a {
      color: #333;
      text-decoration: none;
      display: block;
      transition: color 0.3s ease;
    }
    
    .dropdown-item a:hover {
      color: #28a745;
    }
    
    .dropdown-item i {
      margin-right: 10px;
      color: #28a745;
      width: 20px;
      text-align: center;
    }
    
    /* 汉堡菜单按钮 - 移动端隐藏 */
    .hamburger-btn {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 28px;
      cursor: pointer;
      padding: 5px;
      transition: transform 0.3s ease;
    }
    
    .hamburger-btn:hover {
      transform: rotate(90deg);
    }
    
    /* 移动端导航菜单 - 默认隐藏 */
    .mobile-nav-menu {
      display: none;
      background-color: white;
      position: fixed;
      top: 80px;
      left: 0;
      width: 100%;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.5s ease;
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
      z-index: 999;
    }
    
    .mobile-nav-menu.active {
      max-height: 500px;
    }
    
    .mobile-nav-list {
      list-style: none;
      padding: 20px;
    }
    
    .mobile-nav-item {
      border-bottom: 1px solid #eee;
    }
    
    .mobile-nav-item:last-child {
      border-bottom: none;
    }
    
    .mobile-nav-link {
      display: block;
      padding: 16px 0;
      color: #333;
      text-decoration: none;
      font-weight: 600;
      font-size: 18px;
      transition: color 0.3s ease;
    }
    
    .mobile-nav-link:hover {
      color: #28a745;
    }
    
    .mobile-nav-link i {
      margin-right: 12px;
      color: #28a745;
      width: 20px;
      text-align: center;
    }
    
    .mobile-dropdown-menu {
      list-style: none;
      padding-left: 20px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
    }
    
    .mobile-dropdown-menu.active {
      max-height: 300px;
    }
    
    .mobile-dropdown-item {
      padding: 12px 0;
    }
    
    .mobile-dropdown-item a {
      color: #666;
      text-decoration: none;
      font-weight: 500;
      transition: color 0.3s ease;
    }
    
    .mobile-dropdown-item a:hover {
      color: #28a745;
    }
    
    /* 移动端下拉菜单切换按钮 */
    .dropdown-toggle {
      float: right;
      background: none;
      border: none;
      color: #888;
      font-size: 16px;
      cursor: pointer;
      padding: 5px 10px;
      transition: transform 0.3s ease;
    }
    
    .dropdown-toggle.active {
      transform: rotate(180deg);
    }
    
    /* 内容区域示例 */
    .content {
      max-width: 1200px;
      margin: 0 auto;
      padding: 40px 20px;
    }
    
    .section {
      background-color: white;
      border-radius: 12px;
      padding: 30px;
      margin-bottom: 30px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    }
    
    h1 {
      color: #28a745;
      margin-bottom: 20px;
      font-size: 32px;
    }
    
    h2 {
      color: #333;
      margin-bottom: 15px;
      font-size: 24px;
    }
    
    p {
      margin-bottom: 15px;
      color: #555;
    }
    
    /* 响应式媒体查询 */
    /* 平板设备 (768px - 1024px) */
    @media (max-width: 1024px) {
      .navbar-menu {
        gap: 5px;
      }
      
      .nav-link {
        padding: 10px 15px;
        font-size: 15px;
      }
    }
    
    /* 手机设备 (≤ 767px) */
    @media (max-width: 767px) {
      .navbar-container {
        height: 70px;
      }
      

      .brand-text {
        font-size: 20px;
      }
      
      .brand-logo {
        width: 40px;
        height: 40px;
      }
      
      .brand-logo i {
        font-size: 20px;
      }
      
      /* PC端导航菜单隐藏 */
      .navbar-menu {
        display: none;
      }
      
      /* 显示汉堡菜单按钮 */
      .hamburger-btn {
        display: block;
      }
      
      /* 移动端导航菜单 */
      .mobile-nav-menu {
        display: block;
      }
      
      .content {
        padding: 20px 15px;
      }
      
      .section {
        padding: 20px;
      }
      
      h1 {
        font-size: 28px;
      }
      
      h2 {
        font-size: 22px;
      }
    }
    
    /* 小手机设备 (≤ 480px) */
    @media (max-width: 480px) {
      .navbar-container {
        padding: 0 15px;
      }
      
      .brand-text {
        font-size: 18px;
      }
      
      .brand-logo {
        width: 35px;
        height: 35px;
        margin-right: 8px;
      }
      
      .brand-logo i {
        font-size: 18px;
      }
      
      .mobile-nav-link {
        font-size: 16px;
        padding: 14px 0;
      }
      
      h1 {
        font-size: 24px;
      }
      
      h2 {
        font-size: 20px;
      }
    }