:root {
            --primary: #1a73e8;
            --secondary: #34a853;
            --accent: #fbbc05;
            --dark: #202124;
            --light: #f8f9fa;
            --gray: #5f6368;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        body {
            line-height: 1.6;
            color: var(--dark);
            background-color: #fff;
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 导航栏样式 */
        header {
            background-color: #fff;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
        }
        
        .navbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        
        .logo {
            display: flex;
            align-items: center;
        }
        
        .logo h1 {
            font-size: 24px;
            color: var(--primary);
            margin-left: 10px;
        }
        
        .nav-links {
            display: flex;
            list-style: none;
        }
        
        .nav-links li {
            margin-left: 30px;
        }
        
        .nav-links a {
            text-decoration: none;
            color: var(--dark);
            font-weight: 500;
            transition: color 0.3s;
        }
        
        .nav-links a:hover {
            color: var(--primary);
        }
        
        .mobile-menu {
            display: none;
            font-size: 24px;
            cursor: pointer;
        }
        
        /* 页面标题区域 */
        .page-header {
            background: linear-gradient(135deg, #1a73e8 0%, #4285f4 100%);
            color: white;
            padding: 150px 0 80px;
            text-align: center;
        }
        
        .page-header h1 {
            font-size: 42px;
            margin-bottom: 20px;
        }
        
        .page-header p {
            font-size: 18px;
            max-width: 700px;
            margin: 0 auto;
        }
        
        /* 新闻筛选区域 */
        .news-filter {
            padding: 40px 0;
            text-align: center;
            background-color: var(--light);
        }
        
        .filter-buttons {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 15px;
        }
        
        .filter-btn {
            background: white;
            border: 2px solid var(--primary);
            color: var(--primary);
            padding: 10px 25px;
            border-radius: 30px;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s;
        }
        
        .filter-btn.active, .filter-btn:hover {
            background-color: var(--primary);
            color: white;
        }
        
        /* 新闻列表区域 */
        .news-section {
            padding: 80px 0;
        }
        
        .news-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            gap: 30px;
            margin-bottom: 50px;
        }
        
        .news-card {
            background: white;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s;
        }
        
        .news-card:hover {
            transform: translateY(-10px);
        }
        
        .news-image {
            height: 200px;
            background-size: cover;
            background-position: center;
            position: relative;
        }
        
        .news-tag {
            position: absolute;
            top: 15px;
            right: 15px;
            background-color: var(--primary);
            color: white;
            padding: 5px 15px;
            border-radius: 20px;
            font-size: 14px;
        }
        
        .news-content {
            padding: 25px;
        }
        
        .news-date {
            color: var(--gray);
            font-size: 14px;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
        }
        
        .news-date i {
            margin-right: 5px;
        }
        
        .news-content h3 {
            font-size: 22px;
            margin-bottom: 15px;
            line-height: 1.3;
        }
        
        .news-content p {
            color: var(--gray);
            margin-bottom: 20px;
        }
        
        .news-link {
            display: inline-block;
            background-color: var(--primary);
            color: white;
            padding: 8px 20px;
            border-radius: 5px;
            text-decoration: none;
            font-weight: 600;
            transition: background-color 0.3s;
        }
        
        .news-link:hover {
            background-color: #0d62c9;
        }
        
        /* 分页样式 */
        .pagination {
            display: flex;
            justify-content: center;
            margin-top: 50px;
        }
        
        .pagination a {
            display: inline-block;
            width: 40px;
            height: 40px;
            line-height: 40px;
            text-align: center;
            border: 1px solid #ddd;
            margin: 0 5px;
            text-decoration: none;
            color: var(--dark);
            border-radius: 5px;
            transition: all 0.3s;
        }
        
        .pagination a.active, .pagination a:hover {
            background-color: var(--primary);
            color: white;
            border-color: var(--primary);
        }
        
        /* 热门新闻侧边栏 */
        .sidebar {
            background: var(--light);
            padding: 30px;
            border-radius: 10px;
            margin-bottom: 30px;
        }
        
        .sidebar h3 {
            font-size: 22px;
            margin-bottom: 20px;
            color: var(--primary);
            padding-bottom: 10px;
            border-bottom: 2px solid var(--primary);
        }
        
        .popular-news {
            list-style: none;
        }
        
        .popular-news li {
            margin-bottom: 15px;
            padding-bottom: 15px;
            border-bottom: 1px solid #eee;
        }
        
        .popular-news li:last-child {
            margin-bottom: 0;
            padding-bottom: 0;
            border-bottom: none;
        }
        
        .popular-news a {
            text-decoration: none;
            color: var(--dark);
            font-weight: 500;
            display: block;
            transition: color 0.3s;
        }
        
        .popular-news a:hover {
            color: var(--primary);
        }
        
        .popular-date {
            color: var(--gray);
            font-size: 12px;
            margin-top: 5px;
        }
        
        /* 新闻详情页样式 */
        .news-detail {
            padding: 80px 0;
        }
        
        .detail-header {
            margin-bottom: 30px;
        }
        
        .detail-meta {
            display: flex;
            align-items: center;
            margin-bottom: 20px;
            color: var(--gray);
        }
        
        .detail-meta span {
            margin-right: 20px;
            display: flex;
            align-items: center;
        }
        
        .detail-meta i {
            margin-right: 5px;
        }
        
        .detail-content {
            line-height: 1.8;
        }
        
        .detail-content p {
            margin-bottom: 20px;
        }
        
        .detail-content img {
            max-width: 100%;
            height: auto;
            border-radius: 10px;
            margin: 20px 0;
        }
        
        .back-link {
            display: inline-block;
            margin-top: 30px;
            color: var(--primary);
            text-decoration: none;
            font-weight: 600;
        }
        
        .back-link:hover {
            text-decoration: underline;
        }
        
        /* 页脚样式 */
        footer {
            background-color: var(--dark);
            color: white;
            padding: 60px 0 30px;
        }
        
        .footer-content {
            display: flex;
            justify-content: space-between;
            margin-bottom: 40px;
        }
        
        .footer-column {
            flex: 1;
        }
        
        .footer-column h3 {
            font-size: 20px;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer-column h3::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 2px;
            background-color: var(--primary);
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 10px;
        }
        
        .footer-links a {
            color: #bdc1c6;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-links a:hover {
            color: white;
        }
        
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid #3c4043;
            color: #bdc1c6;
            font-size: 14px;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: white;
                flex-direction: column;
                padding: 20px;
                box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
            }
            
            .nav-links.active {
                display: flex;
            }
            
            .nav-links li {
                margin: 10px 0;
            }
            
            .mobile-menu {
                display: block;
            }
            
            .page-header h1 {
                font-size: 32px;
            }
            
            .news-grid {
                grid-template-columns: 1fr;
            }
            
            .footer-content {
                flex-direction: column;
            }
        }