/* 全局样式 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Arial', sans-serif;
        }
        
        body {
            background-color: #f5f5f5;
            color: #333;
            line-height: 1.6;
        }
        
        a {
            text-decoration: none;
            color: inherit;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        
        /* 头部样式 */
        header {
            background-color: #1a3e72;
            color: white;
            padding: 20px 0;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }
        
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            font-size: 28px;
            font-weight: bold;
            color: white;
        }
        
        .logo span {
            color: #4d9feb;
        }
        
        nav ul {
            display: flex;
            list-style: none;
        }
        
        nav ul li {
            margin-left: 30px;
            position: relative;
        }
        
        nav ul li a {
            font-weight: 500;
            transition: color 0.3s;
        }
        
        nav ul li a:hover {
            color: #4d9feb;
        }
        
        /* 英雄区域 */
        .hero {
            background: linear-gradient(rgba(26, 62, 114, 0.8), rgba(26, 62, 114, 0.8)), 
                        url('https://via.placeholder.com/1920x600') center/cover no-repeat;
            color: white;
            padding: 100px 0;
            text-align: center;
        }
        
        .hero h1 {
            font-size: 48px;
            margin-bottom: 20px;
        }
        
        .hero p {
            font-size: 20px;
            max-width: 800px;
            margin: 0 auto 30px;
        }
        
        .btn {
            display: inline-block;
            background-color: #4d9feb;
            color: white;
            padding: 12px 30px;
            border-radius: 4px;
            font-weight: bold;
            transition: background-color 0.3s;
        }
        
        .btn:hover {
            background-color: #3a8bd9;
        }
        
        /* 特色区域 */
        .features {
            padding: 80px 0;
            background-color: white;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 50px;
        }
        
        .section-title h2 {
            font-size: 36px;
            color: #1a3e72;
            margin-bottom: 15px;
        }
        
        .section-title p {
            color: #666;
            max-width: 700px;
            margin: 0 auto;
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        
        .feature-card {
            background-color: #f9f9f9;
            padding: 30px;
            border-radius: 6px;
            text-align: center;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
        
        .feature-icon {
            font-size: 50px;
            color: #4d9feb;
            margin-bottom: 20px;
        }
        
        .feature-card h3 {
            font-size: 22px;
            margin-bottom: 15px;
            color: #2c3e50;
        }
        
        /* 文章列表区域 */
        .articles {
            padding: 80px 0;
            background-color: #f5f5f5;
        }
        
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        
        .article-card {
            background-color: white;
            border-radius: 6px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s, box-shadow 0.3s;
        }
        
        .article-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        
        .article-image {
            height: 200px;
            overflow: hidden;
        }
        
        .article-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }
        
        .article-card:hover .article-image img {
            transform: scale(1.05);
        }
        
        .article-content {
            padding: 25px;
        }
        
        .article-date {
            color: #4d9feb;
            font-size: 14px;
            margin-bottom: 10px;
        }
        
        .article-card h3 {
            font-size: 20px;
            margin-bottom: 15px;
            color: #2c3e50;
        }
        
        .article-excerpt {
            color: #666;
            margin-bottom: 15px;
        }
        
        .read-more {
            color: #4d9feb;
            font-weight: 500;
            display: inline-block;
        }
        
        /* 联系我们区域 */
        .contact {
            padding: 80px 0;
            background-color: #2c3e50;
            color: white;
        }
        
        .contact-container {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 50px;
        }
        
        .contact-info h3 {
            font-size: 24px;
            margin-bottom: 20px;
        }
        
        .contact-info p {
            margin-bottom: 30px;
            opacity: 0.9;
        }
        
        .contact-details div {
            margin-bottom: 20px;
            display: flex;
            align-items: center;
        }
        
        .contact-details i {
            margin-right: 15px;
            color: #4d9feb;
            font-size: 20px;
        }
        
        .contact-form input,
        .contact-form textarea {
            width: 100%;
            padding: 12px 15px;
            margin-bottom: 20px;
            border: none;
            border-radius: 4px;
            background-color: #34495e;
            color: white;
        }
        
        .contact-form textarea {
            height: 150px;
            resize: vertical;
        }
        
        .contact-form button {
            background-color: #4d9feb;
            color: white;
            border: none;
            padding: 12px 30px;
            border-radius: 4px;
            cursor: pointer;
            font-weight: bold;
            transition: background-color 0.3s;
        }
        
        .contact-form button:hover {
            background-color: #3a8bd9;
        }
        
        /* 页脚 */
        footer {
            background-color: #1a1a1a;
            color: #aaa;
            padding: 50px 0 20px;
        }
        
        .footer-container {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
            margin-bottom: 40px;
        }
        
        .footer-col h4 {
            color: white;
            font-size: 18px;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer-col h4::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 50px;
            height: 2px;
            background-color: #4d9feb;
        }
        
        .footer-col ul {
            list-style: none;
        }
        
        .footer-col ul li {
            margin-bottom: 10px;
        }
        
        .footer-col ul li a {
            transition: color 0.3s;
        }
        
        .footer-col ul li a:hover {
            color: #4d9feb;
        }
        
        .social-links {
            display: flex;
            gap: 15px;
        }
        
        .social-links a {
            display: inline-block;
            width: 40px;
            height: 40px;
            background-color: #333;
            border-radius: 50%;
            text-align: center;
            line-height: 40px;
            transition: background-color 0.3s;
        }
        
        .social-links a:hover {
            background-color: #4d9feb;
        }
        
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #333;
        }
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            .features-grid,
            .articles-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .footer-container {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .contact-container {
                grid-template-columns: 1fr;
            }
        }
        
        @media (max-width: 768px) {
            .header-container {
                flex-direction: column;
            }
            
            nav ul {
                margin-top: 20px;
            }
            
            nav ul li {
                margin-left: 15px;
                margin-right: 15px;
            }
            
            .hero h1 {
                font-size: 36px;
            }
            
            .hero p {
                font-size: 18px;
            }
        }
        
        @media (max-width: 576px) {
            .features-grid,
            .articles-grid {
                grid-template-columns: 1fr;
            }
            
            .footer-container {
                grid-template-columns: 1fr;
            }
            
            nav ul {
                flex-wrap: wrap;
                justify-content: center;
            }
            
            nav ul li {
                margin: 5px 10px;
            }
        }