/**
 * EduMaster - 统一App风格基础样式
 * 所有页面模板统一使用此样式
 */
.ls-app { --primary: #0066FF; --primary-light: #60a5fa; --primary-dark: #0052CD; --success: #10B981; --warning: #F59E0B; --danger: #EF4444; --purple: #8B5CF6; --cyan: #06B6D4; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: #f5f5f5; min-height: 100vh; color: #333; }

/* 头部 */
.ls-app .app-header { position: sticky; top: 0; padding: 16px 20px; z-index: 100; display: flex; align-items: center; justify-content: space-between; }
.ls-app .app-header h1 { font-size: 18px; font-weight: 700; margin: 0; color: #fff; }
.ls-app .header-icons { display: flex; gap: 12px; font-size: 18px; color: #fff; }

/* 内容区 */
.ls-app .app-content { padding: 16px; padding-bottom: 80px; }

/* 搜索栏 */
.ls-app .search-bar { background: #fff; border-radius: 25px; padding: 12px 20px; display: flex; align-items: center; gap: 10px; margin-bottom: 16px; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.ls-app .search-bar input { flex: 1; background: transparent; border: none; color: #333; font-size: 14px; outline: none; }
.ls-app .search-bar input::placeholder { color: #999; }

/* 标签导航 */
.ls-app .tab-nav { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 12px; margin-bottom: 16px; }
.ls-app .tab-item { padding: 10px 18px; background: #fff; border-radius: 20px; font-size: 13px; white-space: nowrap; color: #333; text-decoration: none; border: 1px solid #e0e0e0; }
.ls-app .tab-item:hover, .ls-app .tab-item.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* 区块 */
.ls-app .section { background: #fff; border-radius: 16px; padding: 20px; margin-bottom: 16px; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.ls-app .section-title { font-size: 16px; font-weight: 600; margin-bottom: 16px; display: flex; justify-content: space-between; align-items: center; }
.ls-app .section-title a { font-size: 13px; color: var(--primary); }

/* 横幅 */
.ls-app .banner { background: linear-gradient(135deg, var(--primary), var(--purple)); border-radius: 16px; padding: 20px; margin-bottom: 16px; }
.ls-app .banner h2 { font-size: 18px; margin-bottom: 8px; color: #fff; }
.ls-app .banner p { font-size: 13px; color: rgba(255,255,255,0.8); }

/* 分类网格 */
.ls-app .category-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 16px; }
.ls-app .category-item { text-align: center; padding: 14px 8px; background: #fff; border-radius: 12px; border: 1px solid #e0e0e0; cursor: pointer; }
.ls-app .category-item:active { transform: scale(0.95); }
.ls-app .category-icon { font-size: 26px; margin-bottom: 6px; }
.ls-app .category-name { font-size: 12px; color: #666; }

/* 统计卡片 */
.ls-app .stat-card { background: #fff; border-radius: 12px; padding: 16px; text-align: center; }
.ls-app .stat-value { font-size: 24px; font-weight: 700; color: var(--primary); }
.ls-app .stat-label { font-size: 12px; color: #64748b; margin-top: 4px; }
.ls-app .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }

/* 内容卡片 */
.ls-app .content-card { background: #fff; border-radius: 12px; overflow: hidden; margin-bottom: 12px; border: 1px solid #e0e0e0; }
.ls-app .card-img { height: 120px; background: linear-gradient(135deg, var(--primary), var(--purple)); display: flex; align-items: center; justify-content: center; font-size: 40px; position: relative; }
.ls-app .card-tag { position: absolute; top: 8px; left: 8px; padding: 4px 10px; background: var(--danger); border-radius: 8px; font-size: 10px; color: #fff; }
.ls-app .card-body { padding: 14px; }
.ls-app .card-title { font-size: 15px; font-weight: 600; margin-bottom: 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.ls-app .card-meta { display: flex; justify-content: space-between; align-items: center; }
.ls-app .card-price { font-size: 18px; font-weight: 700; color: var(--danger); }
.ls-app .card-price span { font-size: 12px; font-weight: 400; }
.ls-app .card-sales { font-size: 11px; color: #999; }

/* 列表卡片 */
.ls-app .list-card { background: #fff; border-radius: 12px; padding: 16px; margin-bottom: 12px; display: flex; gap: 14px; border: 1px solid #e0e0e0; }
.ls-app .list-icon { width: 50px; height: 50px; border-radius: 12px; background: linear-gradient(135deg, var(--primary), var(--purple)); display: flex; align-items: center; justify-content: center; font-size: 24px; flex-shrink: 0; }
.ls-app .list-info { flex: 1; }
.ls-app .list-title { font-size: 15px; font-weight: 600; margin-bottom: 4px; }
.ls-app .list-desc { font-size: 12px; color: #64748b; }
.ls-app .list-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.ls-app .tag { padding: 3px 8px; background: rgba(0,102,255,0.1); border-radius: 10px; font-size: 10px; color: var(--primary); }

/* 网格布局 */
.ls-app .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.ls-app .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }

/* 底部导航 */
.ls-app .app-bottom-nav { position: fixed; bottom: 0; left: 0; right: 0; background: #fff; border-top: 1px solid #e5e5e5; display: flex; justify-content: space-around; padding: 10px 0; z-index: 100; box-shadow: 0 -2px 10px rgba(0,0,0,0.05); }
.ls-app .nav-item { display: flex; flex-direction: column; align-items: center; gap: 4px; font-size: 10px; color: #999; text-decoration: none; }
.ls-app .nav-item.active { color: var(--primary); }
.ls-app .nav-item .icon { font-size: 20px; }

/* 按钮 */
.ls-app .btn { display: inline-block; padding: 12px 24px; background: var(--primary); border: none; border-radius: 50px; color: #fff; font-size: 14px; font-weight: 600; cursor: pointer; text-decoration: none; }
.ls-app .btn:hover { opacity: 0.9; }
.ls-app .btn-outline { background: transparent; border: 1px solid var(--primary); color: var(--primary); }

/* 表单 */
.ls-app .form-group { margin-bottom: 16px; }
.ls-app .form-group label { display: block; margin-bottom: 8px; color: #666; font-size: 14px; }
.ls-app .form-group input, .ls-app .form-group select, .ls-app .form-group textarea { width: 100%; padding: 14px; background: #fff; border: 1px solid #e5e5e5; border-radius: 10px; color: #333; font-size: 14px; }
.ls-app .form-group input:focus, .ls-app .form-group select:focus, .ls-app .form-group textarea:focus { outline: none; border-color: var(--primary); }

/* 空状态 */
.ls-app .empty-state { text-align: center; padding: 60px 20px; color: #999; }
.ls-app .empty-state .icon { font-size: 48px; margin-bottom: 16px; }
.ls-app .empty-state p { font-size: 14px; }

/* 加载更多 */
.ls-app .load-more { text-align: center; padding: 20px; color: #999; font-size: 13px; }

/* 响应式 */
@media (max-width: 480px) {
    .ls-app .app-content { padding: 12px; padding-bottom: 80px; }
    .ls-app .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .ls-app .grid-2 { grid-template-columns: 1fr; }
}