* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        :root {
            --primary: #1a3a5f;
            --secondary: #2c6e9b;
            --accent: #e74c3c;
            --light: #f8f9fa;
            --dark: #1c2b3f;
            --gray: #6c757d;
            --success: #28a745;
            --warning: #ffc107;
        }
        
        body {
            background: linear-gradient(135deg, #f0f4f8, #e2e8f0);
            color: #333;
            line-height: 1.6;
        }
        
        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 15px;
        }
        
        /* 头部样式 */
        header {
            background: linear-gradient(135deg, var(--primary), #0e2a47);
            color: white;
            padding: 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        
        .top-bar {
            background-color: rgba(0,0,0,0.2);
            padding: 8px 0;
            font-size: 14px;
        }
        
        .top-bar-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .top-links a {
            color: #e0e6ed;
            text-decoration: none;
            margin-right: 15px;
            transition: color 0.3s;
        }
        
        .top-links a:hover {
            color: white;
        }
        
        .top-links a i {
            margin-right: 5px;
        }
        
        .header-main {
            padding: 15px 0;
        }
        
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            display: flex;
            align-items: center;
            font-size: 28px;
            font-weight: 700;
            color: white;
            text-decoration: none;
        }
        
        .logo i {
            color: var(--warning);
            margin-right: 10px;
            font-size: 32px;
        }
        
        .logo span {
            color: #ffd43b;
        }
        
        .search-box {
            flex: 1;
            max-width: 500px;
            margin: 0 30px;
            position: relative;
        }
        
        .search-box input {
            width: 100%;
            padding: 12px 20px;
            border-radius: 30px;
            border: none;
            font-size: 16px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        
        .search-box button {
            position: absolute;
            right: 10px;
            top: 50%;
            transform: translateY(-50%);
            background: var(--secondary);
            border: none;
            color: white;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            cursor: pointer;
            transition: background 0.3s;
        }
        
        .search-box button:hover {
            background: #1e5a80;
        }
        
        .user-actions {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .btn {
            display: inline-block;
            padding: 10px 20px;
            border-radius: 4px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s;
            cursor: pointer;
            border: none;
            font-size: 15px;
        }
        
        .btn-contribute {
            background-color: var(--success);
            color: white;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        /* 频道横幅 */
        .channel-banner {
            background: linear-gradient(rgba(26, 58, 95, 0.85), rgba(26, 58, 95, 0.9)), 
                        url('https://images.unsplash.com/photo-1503387762-592deb58ef4e?ixlib=rb-4.0.3') no-repeat center center;
            background-size: cover;
            color: white;
            padding: 60px 0;
            text-align: center;
            margin-bottom: 40px;
            border-radius: 0 0 20px 20px;
        }
        
        .channel-title {
            font-size: 48px;
            margin-bottom: 15px;
            text-shadow: 0 2px 8px rgba(0,0,0,0.2);
        }
        
        .channel-description {
            font-size: 20px;
            max-width: 800px;
            margin: 0 auto 30px;
            opacity: 0.9;
        }
        
        .channel-stats {
            display: flex;
            justify-content: center;
            gap: 40px;
            margin-top: 30px;
            flex-wrap: wrap;
        }
        
        .stat-item {
            background: rgba(255,255,255,0.15);
            padding: 15px 25px;
            border-radius: 10px;
            min-width: 160px;
            backdrop-filter: blur(10px);
        }
        
        .stat-number {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 5px;
            color: var(--warning);
        }
        
        .stat-label {
            font-size: 16px;
            opacity: 0.85;
        }
        
        /* 频道内容 */
        .channel-content {
            display: flex;
            gap: 30px;
            margin-bottom: 50px;
        }
        
        .main-content {
            flex: 3;
        }
        
        .sidebar {
            flex: 1;
        }
        
        /* 子分类导航 */
        .subcategories {
            background: white;
            border-radius: 10px;
            padding: 25px;
            margin-bottom: 30px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        
        .section-title {
            font-size: 24px;
            color: var(--dark);
            margin-bottom: 20px;
            padding-bottom: 15px;
            border-bottom: 2px solid #f0f4f8;
            display: flex;
            align-items: center;
        }
        
        .section-title i {
            color: var(--secondary);
            margin-right: 10px;
            background: #e9f5ff;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }
        
        .subcategory-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 15px;
        }
        
        .subcategory-card {
            background: #f8f9fa;
            border-radius: 8px;
            padding: 20px;
            text-align: center;
            transition: all 0.3s;
            text-decoration: none;
            color: var(--dark);
            border: 1px solid #e9ecef;
        }
        
        .subcategory-card:hover {
            background: #e9f5ff;
            transform: translateY(-5px);
            border-color: var(--secondary);
        }
        
        .subcategory-icon {
            font-size: 32px;
            color: var(--secondary);
            margin-bottom: 10px;
        }
        
        .subcategory-name {
            font-weight: 600;
            margin-bottom: 5px;
        }
        
        .subcategory-count {
            color: var(--gray);
            font-size: 14px;
        }
        
        /* 筛选栏 */
        .filter-bar {
            background: white;
            border-radius: 10px;
            padding: 20px;
            margin-bottom: 30px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            align-items: center;
        }
        
        .filter-group {
            display: flex;
            align-items: center;
            background: #f0f4f8;
            border-radius: 6px;
            padding: 8px 15px;
        }
        
        .filter-label {
            color: var(--gray);
            margin-right: 10px;
            font-size: 14px;
        }
        
        .filter-select {
            border: none;
            background: transparent;
            color: var(--dark);
            font-weight: 500;
            padding: 5px;
            cursor: pointer;
            outline: none;
        }
        
        /* 资源列表 */
        .resource-list {
            background: white;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        
        .resource-item {
            display: flex;
            padding: 25px;
            border-bottom: 1px solid #eee;
            transition: all 0.3s;
        }
        
        .resource-item:hover {
            background: #f9fbfd;
        }
        
        .resource-thumb {
            width: 180px;
            height: 150px;
            border-radius: 8px;
            background: linear-gradient(135deg, #f0f4f8, #e2e8f0);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--secondary);
            font-size: 48px;
            flex-shrink: 0;
            margin-right: 25px;
            overflow: hidden;
        }
        
        .resource-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        
        .resource-info {
            flex: 1;
        }
        
        .resource-title {
            font-size: 22px;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 10px;
            text-decoration: none;
            display: block;
        }
        
        .resource-title:hover {
            color: var(--secondary);
        }
        
        .resource-description {
            color: var(--gray);
            margin-bottom: 15px;
            line-height: 1.6;
        }
        
        .resource-meta {
            display: flex;
            gap: 20px;
            color: var(--gray);
            font-size: 14px;
            margin-bottom: 15px;
            flex-wrap: wrap;
        }
        
        .resource-meta span {
            display: flex;
            align-items: center;
        }
        
        .resource-meta i {
            margin-right: 8px;
            color: var(--secondary);
        }
        
        .resource-download {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        
        .download-btn {
            background: linear-gradient(135deg, var(--secondary), var(--primary));
            color: white;
            border: none;
            padding: 10px 25px;
            border-radius: 4px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .download-btn:hover {
            background: linear-gradient(135deg, #1e5a80, #153a5f);
            transform: translateY(-3px);
        }
        
        .resource-rating {
            color: #f39c12;
            font-weight: 600;
        }
        
        /* 侧边栏 */
        .sidebar-card {
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            padding: 25px;
            margin-bottom: 30px;
            position: relative;
            overflow: hidden;
        }
        
        .sidebar-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 5px;
            height: 100%;
            background: linear-gradient(to bottom, var(--secondary), var(--primary));
        }
        
        /* 热门资源 */
        .popular-resources {
            list-style: none;
        }
        
        .popular-item {
            display: flex;
            padding: 15px 0;
            border-bottom: 1px dashed #eee;
            align-items: center;
        }
        
        .popular-item:last-child {
            border-bottom: none;
        }
        
        .popular-rank {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: #f0f4f8;
            color: var(--gray);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            margin-right: 15px;
            flex-shrink: 0;
        }
        
        .popular-rank.top {
            background: linear-gradient(135deg, #ffd43b, #fcc419);
            color: #5c3d00;
        }
        
        .popular-info {
            flex: 1;
        }
        
        .popular-name {
            font-weight: 600;
            margin-bottom: 5px;
            display: block;
            color: var(--dark);
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .popular-name:hover {
            color: var(--secondary);
        }
        
        .popular-stats {
            font-size: 13px;
            color: var(--gray);
            display: flex;
            gap: 15px;
        }
        
        /* 分页 */
        .pagination {
            display: flex;
            justify-content: center;
            padding: 30px 0;
        }
        
        .pagination a, .pagination span {
            display: inline-block;
            width: 40px;
            height: 40px;
            line-height: 40px;
            text-align: center;
            border-radius: 50%;
            margin: 0 5px;
            text-decoration: none;
            color: var(--dark);
            font-weight: 500;
            transition: all 0.3s;
        }
        
        .pagination a:hover {
            background: var(--secondary);
            color: white;
        }
        
        .pagination .current {
            background: var(--secondary);
            color: white;
        }
        
        .pagination .prev, .pagination .next {
            width: auto;
            padding: 0 20px;
            border-radius: 30px;
        }
        
        /* 页脚 */
        footer {
            background: linear-gradient(135deg, var(--dark), #121f33);
            color: white;
            padding: 50px 0 20px;
            margin-top: 50px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
            margin-bottom: 40px;
        }
        
        .footer-column h3 {
            margin-bottom: 25px;
            font-size: 20px;
            position: relative;
            padding-bottom: 12px;
        }
        
        .footer-column h3::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 50px;
            height: 3px;
            background: var(--secondary);
        }
        
        .footer-column ul {
            list-style: none;
        }
        
        .footer-column ul li {
            margin-bottom: 12px;
        }
        
        .footer-column ul li a {
            color: #bdc3c7;
            text-decoration: none;
            transition: color 0.3s;
            display: block;
            padding: 5px 0;
        }
        
        .footer-column ul li a:hover {
            color: white;
            transform: translateX(5px);
        }
        
        .footer-column ul li a i {
            width: 20px;
            margin-right: 10px;
            color: var(--secondary);
        }
        
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #8a9bb0;
            font-size: 15px;
        }
        
        /* 响应式设计 */
        @media (max-width: 1200px) {
            .footer-content {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        
        @media (max-width: 992px) {
            .channel-content {
                flex-direction: column;
            }
            
            .resource-item {
                flex-direction: column;
            }
            
            .resource-thumb {
                width: 100%;
                height: 200px;
                margin-right: 0;
                margin-bottom: 20px;
            }
            
            .subcategory-grid {
                grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
            }
        }
        
        @media (max-width: 768px) {
            .channel-title {
                font-size: 36px;
            }
            
            .channel-description {
                font-size: 18px;
            }
            
            .stat-item {
                min-width: 140px;
                padding: 12px 20px;
            }
            
            .stat-number {
                font-size: 28px;
            }
            
            .footer-content {
                grid-template-columns: 1fr;
            }
        }
        
        @media (max-width: 576px) {
            .header-content {
                flex-wrap: wrap;
            }
            
            .search-box {
                order: 3;
                max-width: 100%;
                margin: 15px 0;
            }
            
            .channel-title {
                font-size: 28px;
            }
            
            .stat-item {
                min-width: 120px;
                padding: 10px 15px;
            }
            
            .subcategory-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }