/* 自定义导航菜单样式 */
    :root {
      --primary-color: #2383bd;
      --primary-hover: #1a6fa5;
      --border-color: #e0e0e0;
      --text-color: #333;
      --text-light: #666;
      --bg-color: #fff;
      --bg-light: #f5f5f5;
    }
    
    
    
    .mobile-nav ul {
      list-style: none;
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    .mobile-nav a {
      text-decoration: none;
      color: inherit;
    }
    
    /* 移动端导航 */
    .mobile-nav {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1000;
      background-color: var(--bg-color);
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    }
    
    /* 导航头部 */
    .mobile-nav-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 16px;
    }
    
    /* Logo样式 */
    .mobile-nav-logo h1 {
      font-size: 18px;
      font-weight: 700;
      color: var(--primary-color);
      margin: 0;
    }
    
    /* 汉堡菜单按钮 */
    .mobile-nav-toggle {
      position: relative;
      width: 36px;
      height: 36px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 4px;
      transition: background-color 0.3s ease;
      border: none;
      background: none;
      cursor: pointer;
    }
    
    .mobile-nav-toggle:hover {
      background-color: var(--bg-light);
    }
    
    /* 汉堡菜单图标 */
    .mobile-nav-icon {
      position: absolute;
      top: 50%;
      left: 8px;
      width: 20px;
      height: 2px;
      background-color: var(--primary-color);
      transition: all 0.3s ease;
    }
    
    .mobile-nav-icon::before,
    .mobile-nav-icon::after {
      content: '';
      position: absolute;
      width: 20px;
      height: 2px;
      background-color: var(--primary-color);
      transition: all 0.3s ease;
    }
    
    .mobile-nav-icon::before {
      top: -6px;
    }
    
    .mobile-nav-icon::after {
      top: 6px;
    }
    
    /* 汉堡菜单激活状态 */
    .mobile-nav-toggle.active .mobile-nav-icon {
      background-color: transparent;
    }
    
    .mobile-nav-toggle.active .mobile-nav-icon::before {
      top: 0;
      transform: rotate(45deg);
    }
    
    .mobile-nav-toggle.active .mobile-nav-icon::after {
      top: 0;
      transform: rotate(-45deg);
    }
    
    /* 导航菜单 */
    .mobile-nav-menu {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-in-out;
      background-color: var(--bg-color);
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    }
    
    .mobile-nav-menu.active {
      max-height: 600px;
    }
    
    /* 菜单项 */
    .mobile-nav-item {
      border-bottom: 1px solid var(--border-color);
    }
    
    .mobile-nav-item:last-child {
      border-bottom: none;
    }
    
    /* 菜单链接 */
    .mobile-nav-link {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      padding: 14px 16px;
      color: var(--text-color);
      font-size: 15px;
      font-weight: 500;
      transition: all 0.3s ease;
      border: none;
      background: none;
      text-align: left;
      cursor: pointer;
    }
    
    .mobile-nav-link:hover {
      color: var(--primary-color);
      background-color: var(--bg-light);
    }
    
    /* 菜单箭头 */
    .mobile-nav-arrow {
      transition: transform 0.3s ease;
      color: var(--primary-color);
      font-size: 12px;
    }
    
    .mobile-nav-item.has-submenu.active .mobile-nav-arrow {
      transform: rotate(90deg);
    }
    
    /* 二级菜单 */
    .mobile-nav-submenu {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-in-out;
      background-color: var(--bg-light);
    }
    
    .mobile-nav-item.has-submenu.active .mobile-nav-submenu {
      max-height: 400px;
    }
    
    /* 二级菜单项 */
    .mobile-nav-submenu li {
      border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    }
    
    .mobile-nav-submenu li:last-child {
      border-bottom: none;
    }
    
    /* 二级菜单链接 */
    .mobile-nav-sublink {
      display: block;
      padding: 12px 16px 12px 32px;
      color: var(--text-light);
      font-size: 14px;
      transition: all 0.3s ease;
    }
    
    .mobile-nav-sublink:hover {
      color: var(--primary-color);
      background-color: rgba(35, 131, 189, 0.05);
      padding-left: 36px;
    }