/* 基础样式 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f5f7fa;
        }
        
        a {
            text-decoration: none;
            color: #0088cc;
            transition: color 0.3s;
        }
        
        a:hover {
            color: #005580;
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        
        /* 头部样式 */
        header {
            background-color: #fff;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        
        .logo {
            display: flex;
            align-items: center;
        }
        
        .logo h1 {
            font-size: 24px;
            color: #0088cc;
            margin-left: 10px;
        }
        
        .logo i {
            font-size: 28px;
            color: #0088cc;
        }
        
        .position {
            font-size: 14px;
            color: #666;
        }
        
        .position i {
            margin: 0 5px;
        }
        
        nav {
            background-color: #0088cc;
        }
        
        .nav-menu {
            display: flex;
            list-style: none;
        }
        
        .nav-menu li {
            position: relative;
        }
        
        .nav-menu a {
            display: block;
            padding: 15px 20px;
            color: white;
            font-weight: 500;
        }
        
        .nav-menu a:hover {
            background-color: #006699;
        }
        
        /* 主要内容区域 */
        .main-content {
            display: flex;
            margin: 30px 0;
            gap: 30px;
        }
        
        .content {
            flex: 3;
        }
        
        .sidebar {
            flex: 1;
        }
        
        .section {
            background-color: #fff;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
            padding: 25px;
            margin-bottom: 30px;
        }
        
        .section-title {
            font-size: 20px;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid #0088cc;
            display: flex;
            align-items: center;
        }
        
        .section-title i {
            margin-right: 10px;
            color: #0088cc;
        }
        
        /* 分类页头部 */
        .category-header {
            background-color: #fff;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
            padding: 25px;
            margin-bottom: 30px;
        }
        
        .category-title {
            font-size: 24px;
            color: #0088cc;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
        }
        
        .category-title i {
            margin-right: 10px;
        }
        
        .category-desc {
            color: #666;
            line-height: 1.6;
        }
        
        /* 文章列表样式 */
        .article-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        
        .article-item {
            display: flex;
            background-color: #fff;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
            overflow: hidden;
            transition: transform 0.3s;
        }
        
        .article-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        .article-img {
            flex: 0 0 250px;
        }
        
        .article-img img {
            width: 100%;
            height: 180px;
            object-fit: cover;
        }
        
        .article-info {
            flex: 1;
            padding: 20px;
        }
        
        .article-title {
            font-size: 18px;
            margin-bottom: 10px;
            line-height: 1.4;
        }
        
        .article-meta {
            display: flex;
            gap: 15px;
            font-size: 13px;
            color: #888;
            margin-bottom: 12px;
        }
        
        .article-meta i {
            margin-right: 5px;
        }
        
        .article-desc {
            font-size: 14px;
            color: #666;
            line-height: 1.5;
        }
        
        /* 下载区域样式 */
        .download-section {
            text-align: center;
        }
        
        .download-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 15px;
            margin-top: 20px;
        }
        
        .download-button {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 20px 15px;
            background-color: #f0f8ff;
            border: 2px solid #0088cc;
            border-radius: 8px;
            transition: all 0.3s;
            color: #0088cc;
            font-weight: 500;
        }
        
        .download-button:hover {
            background-color: #0088cc;
            color: white;
            transform: translateY(-5px);
        }
        
        .download-button i {
            font-size: 32px;
            margin-bottom: 10px;
        }
        
        /* 侧边栏样式 */
        .sidebar-widget {
            margin-bottom: 30px;
        }
        
        .widget-title {
            font-size: 18px;
            margin-bottom: 15px;
            padding-bottom: 8px;
            border-bottom: 1px solid #eee;
            display: flex;
            align-items: center;
        }
        
        .widget-title i {
            margin-right: 8px;
            color: #0088cc;
        }
        
        .widget-list {
            list-style: none;
        }
        
        .widget-list li {
            padding: 10px 0;
            border-bottom: 1px dashed #eee;
        }
        
        .widget-list li:last-child {
            border-bottom: none;
        }
        
        .widget-list a {
            display: flex;
            align-items: center;
        }
        
        .widget-list i {
            margin-right: 8px;
            color: #0088cc;
        }
        
        .widget-meta {
            font-size: 12px;
            color: #888;
            margin-left: auto;
        }
        
        /* 加载更多区域 */
        .load-more {
            text-align: center;
            margin: 30px 0;
        }
        
        .load-more-btn {
            padding: 12px 30px;
            background-color: #0088cc;
            color: white;
            border: none;
            border-radius: 50px;
            font-size: 16px;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        
        .load-more-btn:hover {
            background-color: #006699;
        }
        
        .load-more-btn i {
            margin-right: 8px;
        }
        
        .loading-indicator {
            display: none;
            text-align: center;
            padding: 20px;
        }
        
        .loading-text {
            display: flex;
            align-items: center;
            justify-content: center;
            color: #666;
        }
        
        .loading-spinner {
            width: 20px;
            height: 20px;
            border: 2px solid #f3f3f3;
            border-top: 2px solid #0088cc;
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin-right: 10px;
        }
        
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        
        /* 底部样式 */
        footer {
            background-color: #333;
            color: #fff;
            padding: 40px 0 20px;
        }
        
        .footer-content {
            display: flex;
            justify-content: space-between;
            margin-bottom: 30px;
        }
        
        .footer-section {
            flex: 1;
            padding: 0 15px;
        }
        
        .footer-section h3 {
            font-size: 18px;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 1px solid #555;
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 10px;
        }
        
        .footer-links a {
            color: #ccc;
        }
        
        .footer-links a:hover {
            color: #fff;
        }
        
        .footer-bottom {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #555;
            font-size: 14px;
            color: #aaa;
        }
        
        /* 返回顶部按钮 */
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: #0088cc;
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            z-index: 999;
        }
        
        .back-to-top.show {
            opacity: 1;
            visibility: visible;
        }
        
        .back-to-top:hover {
            background-color: #006699;
        }
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            .main-content {
                flex-direction: column;
            }
            
            .footer-content {
                flex-direction: column;
            }
            
            .footer-section {
                margin-bottom: 30px;
            }
        }
        
        @media (max-width: 768px) {
            .header-top {
                flex-direction: column;
                text-align: center;
            }
            
            .logo {
                margin-bottom: 10px;
            }
            
            .nav-menu {
                flex-wrap: wrap;
                justify-content: center;
            }
            
            .download-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .article-item {
                flex-direction: column;
            }
            
            .article-img {
                flex: 0 0 auto;
            }
            
            .article-img img {
                height: 200px;
            }
        }
        
        @media (max-width: 576px) {
            .download-grid {
                grid-template-columns: 1fr;
            }
            
            .nav-menu a {
                padding: 10px 15px;
            }
            
            .article-meta {
                flex-direction: column;
                gap: 5px;
            }
        }