.menu-toggle-btn {
      position: fixed;
      top: 12px;
      right: 20px; /* 按钮放在右侧 */
      width: 36px;
      height: 36px;
      background-color: #4e7bef;
      color: white;
      border-radius: 6px;
      border: none;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      z-index: 1001;
      font-size: 16px;
      box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    }
    
    .menu-toggle-btn:hover {
      background-color: #3a66d4;
    }
    
    /* 左侧菜单栏 - 宽度变小，文字在图标下面 */
    .sidebar {
      position: fixed;
      top: 0;
      left: 0;
      bottom: 0;
      width: 80px; /* 宽度变小（根据图片描述） */
      background-color: #f5f7fa;
      border-right: 1px solid #e0e0e0;
      z-index: 1000;
      transform: translateX(-100%);
      transition: transform 0.3s ease;
      overflow-y: auto;
      padding-top: 60px;
      display: flex;
      flex-direction: column;
      align-items: center; /* 图标和文字居中 */
    }
    
    /* 菜单栏显示状态 */
    .sidebar.active {
      transform: translateX(0);
      box-shadow: 2px 0 10px rgba(0,0,0,0.1);
    }
    
    /* 菜单项样式 - 图标在上，文字在下，垂直排列 */
    .menu-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      width: 100%;
      height: 70px; /* 稍微减小高度，容纳更多菜单项 */
      padding: 8px 5px;
      text-decoration: none;
      color: #333;
      border-left: 4px solid transparent;
      transition: all 0.2s;
      cursor: pointer;
    }
    
    .menu-item:hover {
      background-color: #e8ecf3;
      border-left-color: #4e7bef;
    }
    
    .menu-item.active {
      background-color: #e8ecf3;
      border-left-color: #4e7bef;
    }
    
    .menu-icon {
      font-size: 20px; /* 稍微减小图标大小 */
      color: #4e7bef;
      margin-bottom: 5px; /* 减小图标与文字的间距 */
    }
    
    .menu-text {
      font-size: 12px; /* 稍微减小文字大小 */
      text-align: center;
      line-height: 1.2;
    }
    
    /* 遮罩层 - 点击隐藏菜单 */
    .overlay {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background-color: rgba(0,0,0,0.3);
      z-index: 999;
      display: none;
    }
    
    .overlay.active {
      display: block;
    }