/* 基础样式 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        body {
            line-height: 1.6;
            color: #333;
            background-color: #f9f9f9;
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 头部样式 */
        header {
            background-color: #1a365d;
            color: white;
            padding: 20px 0;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            font-size: 24px;
            font-weight: bold;
        }
        
        .logo span {
            color: #4dabf7;
        }
        
        nav ul {
            display: flex;
            list-style: none;
        }
        
        nav ul li {
            margin-left: 25px;
        }
        
        nav ul li a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s;
        }
        
        nav ul li a:hover {
            color: #4dabf7;
        }
        
        /* 主要区域样式 */
        .hero {
            background: linear-gradient(rgba(26, 54, 93, 0.85), rgba(26, 54, 93, 0.9));
            background-size: cover;
            background-position: center;
            color: white;
            padding: 80px 0;
            text-align: center;
        }
        
        .hero h1 {
            font-size: 2.8rem;
            margin-bottom: 20px;
            line-height: 1.2;
        }
        
        .hero p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto 30px;
        }
        
        .cta-button {
            display: inline-block;
            background-color: #4dabf7;
            color: white;
            padding: 12px 30px;
            border-radius: 5px;
            text-decoration: none;
            font-weight: bold;
            font-size: 1.1rem;
            transition: background-color 0.3s;
        }
        
        .cta-button:hover {
            background-color: #339af0;
        }
        
        /* 内容区块样式 */
        section {
            padding: 60px 0;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 40px;
            font-size: 2rem;
            color: #1a365d;
            position: relative;
        }
        
        .section-title:after {
            content: '';
            display: block;
            width: 80px;
            height: 3px;
            background-color: #4dabf7;
            margin: 10px auto;
        }
        
        /* 服务介绍样式 */
        .services {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
            margin-top: 30px;
        }
        
        .service-card {
            background-color: white;
            border-radius: 8px;
            padding: 30px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: transform 0.3s, box-shadow 0.3s;
        }
        
        .service-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        
        .service-card h3 {
            color: #1a365d;
            margin-bottom: 15px;
            font-size: 1.4rem;
        }
        
        .service-card p {
            color: #555;
        }
        
        /* 常见问题样式 */
        .faq-container {
            max-width: 900px;
            margin: 0 auto;
        }
        
        .faq-item {
            background-color: white;
            margin-bottom: 15px;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 3px 10px rgba(0,0,0,0.05);
        }
        
        .faq-question {
            padding: 20px;
            font-weight: 600;
            color: #1a365d;
            cursor: pointer;
            position: relative;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .faq-question:after {
            content: '+';
            font-size: 1.5rem;
            color: #4dabf7;
        }
        
        .faq-answer {
            padding: 0 20px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s;
            color: #555;
        }
        
        .faq-item.active .faq-answer {
            padding: 0 20px 20px 20px;
            max-height: 500px;
        }
        
        .faq-item.active .faq-question:after {
            content: '-';
        }
        
        /* 热门话题按钮样式 */
        .topic-buttons {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 15px;
            margin-top: 40px;
        }
        
        .topic-button {
            background-color: #1a365d;
            color: white;
            text-decoration: none;
            padding: 15px 10px;
            border-radius: 5px;
            text-align: center;
            font-weight: 500;
            transition: background-color 0.3s, transform 0.2s;
        }
        
        .topic-button:hover {
            background-color: #2c4d85;
            transform: translateY(-2px);
        }
        
        /* 关于我们样式 */
        .about-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        
        .about-text p {
            margin-bottom: 20px;
        }
        
        /* 页脚样式 */
        footer {
            background: linear-gradient(rgba(26, 54, 93, 0.85), rgba(26, 54, 93, 0.9));
            color: white;
            padding: 50px 0 20px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }
        
        .footer-column h3 {
            margin-bottom: 20px;
            font-size: 1.3rem;
            color: #4dabf7;
        }
        
        .footer-column ul {
            list-style: none;
        }
        
        .footer-column ul li {
            margin-bottom: 10px;
        }
        
        .footer-column ul li a {
            color: #ddd;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-column ul li a:hover {
            color: #4dabf7;
        }
        
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #aaa;
            font-size: 0.9rem;
        }
        
        /* 关键词样式 */
        .keyword {
            font-weight: bold;
            color: #1a365d;
            text-decoration: underline;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                text-align: center;
            }
            
            nav ul {
                margin-top: 20px;
                flex-wrap: wrap;
                justify-content: center;
            }
            
            nav ul li {
                margin: 5px 10px;
            }
            
            .hero h1 {
                font-size: 2rem;
            }
            
            .topic-buttons {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .about-content {
                grid-template-columns: 1fr;
            }
        }
        
        @media (max-width: 480px) {
            .topic-buttons {
                grid-template-columns: 1fr;
            }
            
            .hero {
                padding: 50px 0;
            }
            
            .section-title {
                font-size: 1.6rem;
            }
        }