/* 移动端简化样式 - 测试版本 */
/* 首先确保移动端按钮在所有情况下都显示 */
.mobile-menu-toggle {
  display: none !important;
}

@media screen and (max-width: 768px) {
  
  /* 基础重置 */
  body {
    margin: 0 !important;
    padding: 0 !important;
    overflow-x: hidden !important;
  }

  /* 头部固定 */
  .header {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    z-index: 1000 !important;
    background: rgba(255, 255, 255, 0.95) !important;
    backdrop-filter: blur(20px) !important;
    height: 60px !important;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1) !important;
  }

  /* 头部内容布局 */
  .header-content {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    padding: 0 20px !important;
    height: 60px !important;
    min-height: 60px !important;
    max-width: 100% !important;
    margin: 0 auto !important;
  }

  /* 品牌区域 */
  .header-brand {
    flex: 1 !important;
    margin-left: 0 !important;
  }

  .header-brand .brand-link {
    display: flex !important;
    align-items: center !important;
    gap: 8px !important;
    text-decoration: none !important;
    color: #333 !important;
    padding-left: 0 !important;
  }

  .brand-logo {
    width: 32px !important;
    height: 32px !important;
  }

  .brand-title {
    font-size: 18px !important;
    font-weight: bold !important;
    margin: 0 !important;
  }

  /* 移动端菜单按钮 */
  .mobile-menu-toggle {
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    width: 44px !important;
    height: 44px !important;
    background: none !important;
    border: none !important;
    font-size: 20px !important;
    color: #333 !important;
    cursor: pointer !important;
    border-radius: 4px !important;
  }

  .mobile-menu-toggle:hover {
    background-color: #f5f5f5 !important;
  }

  /* 隐藏桌面导航 */
  .nav-menu {
    display: none !important;
  }

  /* 左侧侧边栏 */
  .mobile-sidebar {
    position: fixed !important;
    top: 60px !important;
    left: -280px !important;
    width: 280px !important;
    height: calc(100vh - 60px) !important;
    background: #fff !important;
    box-shadow: 2px 0 10px rgba(0,0,0,0.1) !important;
    z-index: 999 !important;
    transition: left 0.3s ease !important;
    overflow-y: auto !important;
    padding: 20px 0 !important;
  }

  .mobile-sidebar.active {
    left: 0 !important;
  }



  /* 侧边栏导航 */
  .mobile-nav {
    list-style: none !important;
    margin: 0 !important;
    padding: 0 !important;
  }

  .mobile-nav li {
    border-bottom: 1px solid #eee !important;
  }

  .mobile-nav a {
    display: block !important;
    padding: 15px 20px !important;
    color: #333 !important;
    text-decoration: none !important;
    font-size: 16px !important;
  }

  .mobile-nav a:hover,
  .mobile-nav a.active {
    background-color: #f8f9fa !important;
    color: #007bff !important;
  }

  .mobile-nav .icon {
    margin-right: 10px !important;
    width: 20px !important;
    text-align: center !important;
  }

  /* 主内容区域 */
  .main-content {
    margin-top: 60px !important;
    padding: 20px 15px !important;
    min-height: calc(100vh - 60px) !important;
  }

  /* 回到顶部按钮 */
  .back-to-top {
    position: fixed !important;
    bottom: 20px !important;
    right: 20px !important;
    width: 50px !important;
    height: 50px !important;
    background: #007bff !important;
    color: #fff !important;
    border: none !important;
    border-radius: 50% !important;
    font-size: 20px !important;
    cursor: pointer !important;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2) !important;
    z-index: 1000 !important;
    opacity: 0 !important;
    visibility: hidden !important;
    transition: all 0.3s ease !important;
  }

  .back-to-top.show {
    opacity: 1 !important;
    visibility: visible !important;
  }

  .back-to-top:hover {
    background: #0056b3 !important;
    transform: translateY(-2px) !important;
  }

  /* 侧边栏内容样式 */
  .sidebar-section {
    margin: 20px 0 !important;
    padding: 0 20px !important;
  }

  .sidebar-section h3 {
    font-size: 16px !important;
    color: #333 !important;
    margin-bottom: 15px !important;
    padding-bottom: 8px !important;
    border-bottom: 2px solid #007bff !important;
  }



  .tags {
    display: flex !important;
    flex-wrap: wrap !important;
    gap: 8px !important;
  }

  .tag {
    padding: 4px 8px !important;
    background: #f8f9fa !important;
    border: 1px solid #ddd !important;
    border-radius: 12px !important;
    font-size: 12px !important;
    color: #666 !important;
    text-decoration: none !important;
  }

  /* 课程导航样式 */
  .course-nav {
    list-style: none !important;
    margin: 0 !important;
    padding: 0 !important;
  }

  .course-nav li {
    border-bottom: 1px solid #eee !important;
    margin-bottom: 0 !important;
  }

  .course-nav li.current {
    background-color: #e3f2fd !important;
  }

  .course-nav a {
    display: flex !important;
    align-items: center !important;
    padding: 12px 20px !important;
    color: #333 !important;
    text-decoration: none !important;
    font-size: 14px !important;
    gap: 8px !important;
  }

  .course-nav li.current a {
    color: #1976d2 !important;
    font-weight: 500 !important;
  }

  .course-nav a:hover {
    background-color: #f5f5f5 !important;
  }

  .lesson-num {
    background: #f0f0f0 !important;
    color: #666 !important;
    padding: 2px 6px !important;
    border-radius: 4px !important;
    font-size: 12px !important;
    font-weight: 500 !important;
    min-width: 50px !important;
    text-align: center !important;
  }

  .course-nav li.current .lesson-num {
    background: #1976d2 !important;
    color: white !important;
  }

  .lesson-title {
    flex: 1 !important;
    line-height: 1.3 !important;
  }


}

/* 大于768px时隐藏移动端元素 */
@media screen and (min-width: 769px) {
  .mobile-menu-toggle,
  .mobile-sidebar {
    display: none !important;
  }
}