/* 移动端优化样式 */

/* 移动端导航菜单 */
.mobile-menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 10px;
  position: relative;
}

.mobile-menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  margin: 5px 0;
  transition: 0.3s;
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-primary);
  z-index: 999;
  padding: 20px;
  overflow-y: auto;
}

.mobile-menu.active {
  display: block;
}

.mobile-menu-links {
  list-style: none;
  padding: 0;
}

.mobile-menu-links a {
  display: block;
  padding: 16px;
  color: var(--text-primary);
  text-decoration: none;
  font-size: 16px;
  border-bottom: 1px solid var(--border-color);
  transition: background 0.3s;
}

.mobile-menu-links a:active {
  background: var(--bg-secondary);
}

/* 平板和手机断点 */
@media (max-width: 1024px) {
  .container {
    padding: 0 16px;
  }
  
  .course-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
  }
}

@media (max-width: 768px) {
  /* 导航栏移动端适配 */
  .mobile-menu-toggle {
    display: block;
  }
  
  .navbar-menu {
    display: none;
  }
  
  .navbar-actions {
    display: none;
  }
  
  /* 标题和文字大小调整 */
  h1 { font-size: 28px; }
  h2 { font-size: 24px; }
  h3 { font-size: 20px; }
  
  .hero-title {
    font-size: 36px;
  }
  
  .hero-subtitle {
    font-size: 16px;
  }
  
  .section-title {
    font-size: 28px;
  }
  
  /* 课程卡片移动端优化 */
  .course-grid {
    grid-template-columns: 1fr;
  }
  
  .course-card {
    border-radius: 12px;
  }
  
  /* 按钮优化 - 最小44x44px触摸目标 */
  .btn {
    min-height: 44px;
    padding: 12px 24px;
    font-size: 16px;
  }
  
  button, a[role="button"], input[type="submit"], input[type="button"] {
    min-height: 44px;
    min-width: 44px;
  }
  
  /* 表单元素优化 */
  input, textarea, select {
    font-size: 16px; /* 防止iOS自动缩放 */
    min-height: 44px;
    padding: 12px;
  }
  
  /* 视频播放器移动端优化 */
  video {
    width: 100%;
    height: auto;
    max-height: 60vh;
  }
  
  .video-controls {
    font-size: 16px;
  }
  
  /* 管理后台响应式 */
  .admin-layout {
    flex-direction: column;
  }
  
  .admin-sidebar {
    width: 100%;
    position: relative;
  }
  
  .stats-grid {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 12px;
  }
  
  .chart-row {
    grid-template-columns: 1fr;
  }
  
  /* 轮播优化 */
  .carousel-card {
    flex: 0 0 85vw;
  }
  
  .carousel-controls {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    padding: 0 10px;
    pointer-events: none;
  }
  
  .carousel-btn {
    pointer-events: auto;
  }
  
  /* 间距调整 */
  .hero-section {
    padding: 60px 20px 40px;
  }
  
  .featured-section, .courses-section {
    padding: 40px 0;
  }
  
  /* 模态框移动端优化 */
  .modal {
    padding: 16px;
  }
  
  .modal-content {
    width: 100%;
    max-width: 100%;
    margin: 20px 0;
    border-radius: 12px;
  }
}

@media (max-width: 480px) {
  /* 超小屏幕优化 */
  .navbar-brand {
    font-size: 16px;
  }
  
  .navbar-logo {
    width: 32px;
    height: 32px;
  }
  
  .hero-title {
    font-size: 28px;
  }
  
  .section-title {
    font-size: 24px;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
}

/* 触摸优化 */
@media (hover: none) and (pointer: coarse) {
  /* 移除悬停效果，使用点击反馈 */
  .course-card:hover {
    transform: none;
  }
  
  .course-card:active {
    transform: scale(0.98);
  }
  
  .btn:hover {
    transform: none;
  }
  
  .btn:active {
    transform: scale(0.98);
  }
  
  /* 增加滚动平滑度 */
  * {
    -webkit-overflow-scrolling: touch;
  }
  
  /* 禁用长按选择 */
  .btn, .course-card, .carousel-btn {
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
  }
}

/* PWA独立模式优化 */
@media (display-mode: standalone) {
  /* 为独立应用模式添加特殊样式 */
  body {
    padding-top: env(safe-area-inset-top);
    padding-bottom: env(safe-area-inset-bottom);
  }
  
  .navbar {
    padding-top: env(safe-area-inset-top);
  }
}

/* 横屏模式优化 */
@media (orientation: landscape) and (max-height: 500px) {
  .navbar {
    height: 48px;
  }
  
  .hero-section {
    padding: 40px 20px 20px;
  }
  
  video {
    max-height: 80vh;
  }
}

/* 打印样式 */
@media print {
  .navbar, .mobile-menu-toggle, .carousel-controls, .btn {
    display: none !important;
  }
  
  .course-card {
    break-inside: avoid;
  }
}