/* 基础样式 */
        :root {
            --primary-color: #0088cc;
            --secondary-color: #2a2a2a;
            --accent-color: #34b7f1;
            --bg-color: #1e1e1e;
            --card-bg: #2d2d2d;
            --text-color: #e1e1e1;
            --border-color: #444;
            --hover-color: #3a3a3a;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background-color: var(--bg-color);
            color: var(--text-color);
            line-height: 1.6;
        }
        
        a {
            color: var(--accent-color);
            text-decoration: none;
            transition: color 0.3s;
        }
        
        a:hover {
            color: var(--primary-color);
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 头部样式 */
        header {
            background-color: var(--secondary-color);
            padding: 15px 0;
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            font-size: 24px;
            font-weight: bold;
            color: var(--primary-color);
            display: flex;
            align-items: center;
        }
        
        .logo i {
            margin-right: 10px;
            font-size: 28px;
        }
        
        nav ul {
            display: flex;
            list-style: none;
        }
        
        nav ul li {
            margin-left: 20px;
        }
        
        nav ul li a {
            color: var(--text-color);
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 4px;
        }
        
        nav ul li a:hover {
            background-color: var(--hover-color);
            color: var(--accent-color);
        }
        
        /* 主内容区样式 */
        main {
            padding: 40px 0;
        }
        
        .breadcrumb {
            margin-bottom: 30px;
            font-size: 14px;
            color: #aaa;
        }
        
        .breadcrumb a {
            color: #aaa;
        }
        
        .breadcrumb a:hover {
            color: var(--accent-color);
        }
        
        .section-title {
            font-size: 24px;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--primary-color);
            display: flex;
            align-items: center;
        }
        
        .section-title i {
            margin-right: 10px;
            color: var(--primary-color);
        }
        
        /* 下载区域样式 */
        .download-section {
            background-color: var(--card-bg);
            border-radius: 10px;
            padding: 30px;
            margin-bottom: 40px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        
        .download-buttons {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 15px;
        }
        
        .download-button {
            display: flex;
            align-items: center;
            justify-content: center;
            background-color: var(--primary-color);
            color: white;
            padding: 15px;
            border-radius: 8px;
            font-weight: 500;
            transition: all 0.3s;
        }
        
        .download-button:hover {
            background-color: var(--accent-color);
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
            color: white;
        }
        
        .download-button i {
            margin-right: 10px;
            font-size: 20px;
        }
        
        /* 文章区域样式 */
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 25px;
            margin-bottom: 40px;
        }
        
        .article-card {
            background-color: var(--card-bg);
            border-radius: 10px;
            overflow: hidden;
            transition: transform 0.3s, box-shadow 0.3s;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        }
        
        .article-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
        }
        
        .article-image {
            width: 100%;
            height: 180px;
            object-fit: cover;
        }
        
        .article-content {
            padding: 20px;
        }
        
        .article-title {
            font-size: 18px;
            margin-bottom: 10px;
            line-height: 1.4;
        }
        
        .article-meta {
            display: flex;
            justify-content: space-between;
            font-size: 12px;
            color: #aaa;
            margin-bottom: 10px;
        }
        
        .article-description {
            font-size: 14px;
            color: #ccc;
            line-height: 1.5;
        }
        
        /* 侧边栏样式 */
        .sidebar {
            background-color: var(--card-bg);
            border-radius: 10px;
            padding: 20px;
            margin-bottom: 40px;
        }
        
        .sidebar-item {
            margin-bottom: 25px;
        }
        
        .sidebar-item:last-child {
            margin-bottom: 0;
        }
        
        .sidebar-list {
            list-style: none;
        }
        
        .sidebar-list li {
            padding: 10px 0;
            border-bottom: 1px solid var(--border-color);
        }
        
        .sidebar-list li:last-child {
            border-bottom: none;
        }
        
        .sidebar-list li a {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .sidebar-list li a span {
            font-size: 12px;
            color: #aaa;
        }
        
        /* 友情链接样式 */
        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        
        .friend-links a {
            background-color: var(--hover-color);
            padding: 8px 15px;
            border-radius: 20px;
            font-size: 14px;
            transition: all 0.3s;
        }
        
        .friend-links a:hover {
            background-color: var(--primary-color);
            color: white;
        }
        
        /* 底部样式 */
        footer {
            background-color: var(--secondary-color);
            padding: 30px 0;
            border-top: 1px solid var(--border-color);
        }
        
        .footer-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .copyright {
            color: #aaa;
            font-size: 14px;
        }
        
        .sitemap {
            font-size: 14px;
        }
        
        /* 返回顶部按钮 */
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background-color: var(--primary-color);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            z-index: 99;
        }
        
        .back-to-top.show {
            opacity: 1;
            visibility: visible;
        }
        
        .back-to-top:hover {
            background-color: var(--accent-color);
            transform: translateY(-5px);
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                text-align: center;
            }
            
            nav ul {
                margin-top: 15px;
                flex-wrap: wrap;
                justify-content: center;
            }
            
            nav ul li {
                margin: 5px;
            }
            
            .download-buttons {
                grid-template-columns: 1fr;
            }
            
            .articles-grid {
                grid-template-columns: 1fr;
            }
            
            .footer-content {
                flex-direction: column;
                text-align: center;
            }
            
            .sitemap {
                margin-top: 15px;
            }
        }