/* 基础样式 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f5f5f5;
        }
        
        a {
            text-decoration: none;
            color: #3390ec;
            transition: color 0.3s;
        }
        
        a:hover {
            color: #1a6dc1;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        
        /* 头部样式 */
        header {
            background-color: #3390ec;
            color: white;
            padding: 15px 0;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }
        
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            display: flex;
            align-items: center;
        }
        
        .logo a {
            color: white;
            font-size: 24px;
            font-weight: bold;
            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: white;
            font-weight: 500;
            padding: 5px 10px;
            border-radius: 4px;
        }
        
        nav ul li a:hover {
            background-color: rgba(255, 255, 255, 0.1);
        }
        
        /* 主要内容区域 */
        main {
            display: flex;
            margin: 20px 0;
        }
        
        .content {
            flex: 3;
            background: white;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
            padding: 30px;
            margin-right: 20px;
        }
        
        .sidebar {
            flex: 1;
        }
        
        .widget {
            background: white;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
            padding: 20px;
            margin-bottom: 20px;
        }
        
        .widget-title {
            font-size: 18px;
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 1px solid #eee;
            color: #3390ec;
            display: flex;
            align-items: center;
        }
        
        .widget-title i {
            margin-right: 8px;
        }
        
        /* 面包屑导航 */
        .breadcrumb {
            margin-bottom: 20px;
            font-size: 14px;
            color: #777;
        }
        
        .breadcrumb a {
            color: #777;
        }
        
        .breadcrumb a:hover {
            color: #3390ec;
        }
        
        .breadcrumb i {
            margin: 0 8px;
        }
        
        /* 文章头部 */
        .article-header {
            margin-bottom: 25px;
            padding-bottom: 15px;
            border-bottom: 1px solid #eee;
        }
        
        .article-title {
            font-size: 28px;
            line-height: 1.3;
            margin-bottom: 15px;
            color: #333;
        }
        
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            font-size: 14px;
            color: #777;
        }
        
        .article-meta span {
            display: flex;
            align-items: center;
        }
        
        .article-meta i {
            margin-right: 5px;
        }
        
        /* 文章内容 */
        .article-content {
            line-height: 1.8;
            font-size: 16px;
        }
        
        .article-content img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
            margin: 20px 0;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }
        
        .article-content p {
            margin-bottom: 15px;
        }
        
        .article-content h2, .article-content h3 {
            margin: 25px 0 15px;
            color: #3390ec;
        }
        
        .article-content ul, .article-content ol {
            margin: 15px 0;
            padding-left: 20px;
        }
        
        .article-content li {
            margin-bottom: 8px;
        }
        
        /* 下载区域样式 */
        .download-section {
            background: linear-gradient(135deg, #3390ec, #1a6dc1);
            color: white;
            padding: 30px 20px;
            border-radius: 8px;
            text-align: center;
            margin: 30px 0;
        }
        
        .download-title {
            font-size: 24px;
            margin-bottom: 20px;
        }
        
        .download-buttons {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 15px;
        }
        
        .download-button {
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(255, 255, 255, 0.2);
            color: white;
            padding: 12px 15px;
            border-radius: 6px;
            transition: background 0.3s;
        }
        
        .download-button:hover {
            background: rgba(255, 255, 255, 0.3);
            color: white;
        }
        
        .download-button i {
            margin-right: 10px;
            font-size: 20px;
        }
        
        /* 文章导航 */
        .article-navigation {
            display: flex;
            justify-content: space-between;
            margin-top: 40px;
            padding-top: 20px;
            border-top: 1px solid #eee;
        }
        
        .nav-item {
            flex: 1;
            padding: 15px;
            border-radius: 6px;
            transition: background 0.3s;
        }
        
        .nav-item:hover {
            background: #f9f9f9;
        }
        
        .nav-prev {
            margin-right: 10px;
        }
        
        .nav-next {
            margin-left: 10px;
            text-align: right;
        }
        
        .nav-label {
            font-size: 14px;
            color: #777;
            margin-bottom: 5px;
        }
        
        .nav-title {
            font-weight: 500;
            line-height: 1.4;
        }
        
        /* 侧边栏文章样式 */
        .sidebar-article {
            display: flex;
            padding: 12px 0;
            border-bottom: 1px solid #f0f0f0;
        }
        
        .sidebar-article:last-child {
            border-bottom: none;
        }
        
        .sidebar-article-img {
            flex: 0 0 80px;
            margin-right: 12px;
        }
        
        .sidebar-article-img img {
            width: 100%;
            height: 60px;
            object-fit: cover;
            border-radius: 4px;
        }
        
        .sidebar-article-info {
            flex: 1;
        }
        
        .sidebar-article-title {
            font-size: 14px;
            line-height: 1.4;
            margin-bottom: 5px;
        }
        
        .sidebar-article-meta {
            font-size: 12px;
            color: #888;
            display: flex;
            justify-content: space-between;
        }
        
        .sidebar-article-meta span {
            display: flex;
            align-items: center;
        }
        
        .sidebar-article-meta i {
            margin-right: 5px;
        }
        
        /* 底部样式 */
        footer {
            background: #333;
            color: #aaa;
            padding: 30px 0 20px;
        }
        
        .footer-content {
            display: flex;
            justify-content: space-between;
            margin-bottom: 20px;
        }
        
        .footer-section {
            flex: 1;
            padding: 0 15px;
        }
        
        .footer-section h3 {
            color: white;
            margin-bottom: 15px;
            font-size: 18px;
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 8px;
        }
        
        .footer-links a {
            color: #aaa;
        }
        
        .footer-links a:hover {
            color: white;
        }
        
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #444;
            font-size: 14px;
        }
        
        /* 返回顶部按钮 */
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: #3390ec;
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
            z-index: 1000;
        }
        
        .back-to-top.show {
            opacity: 1;
            visibility: visible;
        }
        
        .back-to-top:hover {
            background: #1a6dc1;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                text-align: center;
            }
            
            nav ul {
                margin-top: 15px;
                justify-content: center;
            }
            
            nav ul li {
                margin: 0 10px;
            }
            
            main {
                flex-direction: column;
            }
            
            .content {
                margin-right: 0;
                margin-bottom: 20px;
                padding: 20px;
            }
            
            .article-title {
                font-size: 22px;
            }
            
            .article-meta {
                flex-direction: column;
                gap: 8px;
            }
            
            .article-navigation {
                flex-direction: column;
            }
            
            .nav-item {
                margin: 5px 0;
            }
            
            .nav-next {
                text-align: left;
            }
            
            .footer-content {
                flex-direction: column;
            }
            
            .footer-section {
                margin-bottom: 20px;
            }
            
            .download-buttons {
                grid-template-columns: 1fr;
            }
        }