* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        body {
            background-color: #f8fafc;
            color: #334155;
            line-height: 1.6;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 头部样式 */
        header {
            background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
            color: white;
            padding: 15px 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            display: flex;
            align-items: center;
        }
        
        .logo-icon {
            font-size: 28px;
            margin-right: 12px;
            color: #60a5fa;
        }
        
        .logo-text {
            font-size: 24px;
            font-weight: 700;
        }
        
        .logo-subtitle {
            font-size: 14px;
            opacity: 0.9;
            margin-top: 2px;
        }
        
        nav ul {
            display: flex;
            list-style: none;
        }
        
        nav li {
            margin-left: 30px;
            position: relative;
        }
        
        nav a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            padding: 8px 0;
            transition: all 0.3s;
            display: flex;
            align-items: center;
        }
        
        nav a:hover {
            color: #93c5fd;
        }
        
        nav a i {
            margin-right: 8px;
            font-size: 18px;
        }
        
        .dropdown {
            position: relative;
        }
        
        .dropdown-content {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            background-color: white;
            min-width: 150px;
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
            border-radius: 8px;
            overflow: hidden;
            z-index: 1;
        }
        
        .dropdown:hover .dropdown-content {
            display: block;
        }
        
        .dropdown-content a {
            color: #334155;
            padding: 8px 8px;
            display: block;
            border-bottom: 1px solid #f1f5f9;
        }
        
        .dropdown-content a:hover {
            background-color: #f1f5f9;
            color: #3b82f6;
        }
        
        .mobile-menu {
            display: none;
            font-size: 24px;
            cursor: pointer;
        }
        
        /* 英雄区域 */
        .hero {
            background: linear-gradient(rgba(30, 58, 138, 0.85), rgba(30, 58, 138, 0.9)), url('https://images.unsplash.com/photo-1611974789855-9c2a0a7236a3?ixlib=rb-4.0.3&auto=format&fit=crop&w=1200&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 100px 0;
            text-align: center;
        }
        
        .hero h1 {
            font-size: 48px;
            margin-bottom: 20px;
            font-weight: 700;
        }
        
        .hero p {
            font-size: 20px;
            max-width: 700px;
            margin: 0 auto 30px;
            opacity: 0.9;
        }
        
        .btn {
            display: inline-block;
            background-color: #f59e0b;
            color: white;
            padding: 14px 32px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            font-size: 16px;
            transition: all 0.3s;
            box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
        }
        
        .btn:hover {
            background-color: #d97706;
            transform: translateY(-3px);
            box-shadow: 0 6px 15px rgba(245, 158, 11, 0.4);
        }
        
        /* 内容区域 */
        .section {
            padding: 80px 0;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 60px;
        }
        
        .section-title h2 {
            font-size: 36px;
            color: #1e3a8a;
            margin-bottom: 15px;
            font-weight: 700;
        }
        
        .section-title p {
            font-size: 18px;
            color: #64748b;
            max-width: 700px;
            margin: 0 auto;
        }
        
        .features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 30px;
        }
        
        .feature-card {
            background: white;
            border-radius: 12px;
            padding: 40px 30px;
            box-shadow: 0 6px 15px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s, box-shadow 0.3s;
            text-align: center;
        }
        
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 12px 25px rgba(0, 0, 0, 0.1);
        }
        
        .feature-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, #3b82f6, #1e40af);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 25px;
            color: white;
            font-size: 32px;
        }
        
        .feature-card h3 {
            font-size: 22px;
            margin-bottom: 15px;
            color: #1e3a8a;
        }
        
        .feature-card p {
            color: #64748b;
            line-height: 1.7;
        }
        
        /* 产品展示 */
        .products {
            background-color: #f1f5f9;
        }
        
        .product-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
            gap: 30px;
        }
        
        .product-card {
            background: white;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 6px 15px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s;
        }
        
        .product-card:hover {
            transform: translateY(-5px);
        }
        
        .product-img {
            height: 200px;
            background-color: #3b82f6;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 48px;
        }
        
        .product-content {
            padding: 30px;
        }
        
        .product-content h3 {
            font-size: 24px;
            margin-bottom: 15px;
            color: #1e3a8a;
        }
        
        .product-content p {
            color: #64748b;
            margin-bottom: 20px;
            line-height: 1.7;
        }
        
        .product-link {
            display: inline-flex;
            align-items: center;
            color: #3b82f6;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s;
        }
        
        .product-link i {
            margin-left: 8px;
            transition: transform 0.3s;
        }
        
        .product-link:hover {
            color: #1e40af;
        }
        
        .product-link:hover i {
            transform: translateX(5px);
        }
        
        /* 服务介绍 */
        .services {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }
        
        .service-card {
            background: white;
            border-radius: 12px;
            padding: 40px 30px;
            box-shadow: 0 6px 15px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s;
            position: relative;
            overflow: hidden;
        }
        
        .service-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 5px;
            height: 100%;
            background: linear-gradient(to bottom, #3b82f6, #1e40af);
        }
        
        .service-card:hover {
            transform: translateY(-5px);
        }
        
        .service-card h3 {
            font-size: 22px;
            margin-bottom: 15px;
            color: #1e3a8a;
        }
        
        .service-card p {
            color: #64748b;
            line-height: 1.7;
        }
        
        /* 关于我们 */
        .about {
            background-color: #f1f5f9;
        }
        
        .about-content {
            display: flex;
            align-items: center;
            gap: 50px;
        }
        
        .about-text {
            flex: 1;
        }
        
        .about-text h2 {
            font-size: 36px;
            color: #1e3a8a;
            margin-bottom: 20px;
        }
        
        .about-text p {
            color: #64748b;
            margin-bottom: 25px;
            line-height: 1.7;
        }
        
        .about-image {
            flex: 1;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        
        .about-image img {
            width: 100%;
            height: auto;
            display: block;
        }
        
        /* 页脚 */
        footer {
            background: linear-gradient(135deg, #1e3a8a 0%, #1e40af 100%);
            color: white;
            padding: 60px 0 30px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        
        .footer-column h3 {
            font-size: 20px;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer-column h3::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 3px;
            background-color: #60a5fa;
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 12px;
        }
        
        .footer-links a {
            color: #cbd5e1;
            text-decoration: none;
            transition: color 0.3s;
            display: flex;
            align-items: center;
        }
        
        .footer-links a i {
            margin-right: 10px;
            font-size: 14px;
        }
        
        .footer-links a:hover {
            color: white;
        }
        
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid #334155;
            color: #cbd5e1;
            font-size: 14px;
        }
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            .hero h1 {
                font-size: 40px;
            }
            
            .about-content {
                flex-direction: column;
            }
            
            .product-grid {
                grid-template-columns: 1fr;
            }
        }
        
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                text-align: center;
            }
            
            nav ul {
                margin-top: 20px;
                flex-wrap: wrap;
                justify-content: center;
            }
            
            nav li {
                margin: 0 10px 10px;
            }
            
            .hero {
                padding: 70px 0;
            }
            
            .hero h1 {
                font-size: 32px;
            }
            
            .hero p {
                font-size: 18px;
            }
            
            .section {
                padding: 60px 0;
            }
            
            .features, .services {
                grid-template-columns: 1fr;
            }
            
            .footer-content {
                grid-template-columns: 1fr;
                text-align: center;
            }
            
            .footer-column h3::after {
                left: 50%;
                transform: translateX(-50%);
            }
        }
        
        @media (max-width: 576px) {
            .logo-text {
                font-size: 20px;
            }
            
            .hero h1 {
                font-size: 28px;
            }
            
            .section-title h2 {
                font-size: 28px;
            }
            
            .feature-card, .service-card {
                padding: 30px 20px;
            }
        }