:root {
            --primary-color: #2563eb;
            --secondary-color: #1e40af;
            --accent-color: #3b82f6;
            --text-color: #333;
            --light-color: #f8fafc;
            --dark-color: #1e293b;
            --gray-color: #64748b;
            --border-radius: 8px;
            --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        html {
            scroll-behavior: smooth;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: var(--light-color);
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 头部样式 */
        header {
            background-color: white;
            box-shadow: var(--box-shadow);
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
        }
        
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        
        .logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary-color);
            text-decoration: none;
            display: flex;
            align-items: center;
        }
        
        .logo i {
            margin-right: 8px;
            font-size: 2rem;
        }
        
        .logo span {
            color: var(--dark-color);
        }
        
        nav ul {
            display: flex;
            list-style: none;
        }
        
        nav li {
            margin-left: 30px;
        }
        
        nav a {
            text-decoration: none;
            color: var(--dark-color);
            font-weight: 600;
            transition: var(--transition);
            position: relative;
        }
        
        nav a:hover {
            color: var(--primary-color);
        }
        
        nav a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--primary-color);
            transition: var(--transition);
        }
        
        nav a:hover::after {
            width: 100%;
        }
        
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--dark-color);
            cursor: pointer;
        }
        
        /* 主内容区 */
        main {
            margin-top: 80px;
        }
        
        section {
            padding: 80px 0;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 50px;
        }
        
        .section-title h2 {
            font-size: 2.5rem;
            color: var(--dark-color);
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
        }
        
        .section-title h2::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 70px;
            height: 4px;
            background-color: var(--primary-color);
        }
        
        .section-title p {
            color: var(--gray-color);
            max-width: 700px;
            margin: 0 auto;
            font-size: 1.1rem;
        }
        
        /* 首页横幅 */
        .hero {
            background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
            color: white;
            padding: 100px 0;
            text-align: center;
        }
        
        .hero h1 {
            font-size: 3.2rem;
            margin-bottom: 20px;
            line-height: 1.2;
        }
        
        .hero p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto 30px;
            opacity: 0.9;
        }
        
        .btn {
            display: inline-block;
            background-color: white;
            color: var(--primary-color);
            padding: 12px 30px;
            border-radius: var(--border-radius);
            text-decoration: none;
            font-weight: 600;
            transition: var(--transition);
            border: 2px solid transparent;
        }
        
        .btn:hover {
            background-color: var(--primary-color);
            color: white;
            border-color: white;
        }
        
        .btn-primary {
            background-color: var(--primary-color);
            color: white;
        }
        
        .btn-primary:hover {
            background-color: var(--secondary-color);
        }
        
        /* 关于我们 */
        .about-content {
            display: flex;
            align-items: center;
            gap: 50px;
        }
        
        .about-text {
            flex: 1;
        }
        
        .about-text h3 {
            font-size: 1.8rem;
            margin-bottom: 20px;
            color: var(--dark-color);
        }
        
        .about-text p {
            margin-bottom: 20px;
            color: var(--gray-color);
        }
        
        .about-stats {
            display: flex;
            justify-content: space-between;
            margin-top: 30px;
        }
        
        .stat-item {
            text-align: center;
        }
        
        .stat-item h4 {
            font-size: 2.2rem;
            color: var(--primary-color);
            margin-bottom: 5px;
        }
        
        .stat-item p {
            font-size: 0.9rem;
            color: var(--gray-color);
        }
        
        .about-image {
            flex: 1;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
        }
        
        .about-image img {
            width: 100%;
            height: auto;
            display: block;
        }
        
        /* 公司业务 */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 30px;
        }
        
        .service-card {
            background-color: white;
            border-radius: var(--border-radius);
            padding: 30px;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
        }
        
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
        }
        
        .service-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        
        .service-card h3 {
            font-size: 1.5rem;
            margin-bottom: 15px;
            color: var(--dark-color);
        }
        
        .service-card p {
            color: var(--gray-color);
            margin-bottom: 15px;
        }
        
        /* 公司动态 */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 30px;
        }
        
        .news-card {
            background-color: white;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
        }
        
        .news-card:hover {
            transform: translateY(-5px);
        }
        
        .news-image {
            height: 200px;
            overflow: hidden;
        }
        
        .news-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        
        .news-card:hover .news-image img {
            transform: scale(1.05);
        }
        
        .news-content {
            padding: 20px;
        }
        
        .news-date {
            color: var(--primary-color);
            font-size: 0.9rem;
            margin-bottom: 10px;
            display: block;
        }
        
        .news-content h3 {
            font-size: 1.3rem;
            margin-bottom: 10px;
            color: var(--dark-color);
        }
        
        .news-content p {
            color: var(--gray-color);
            font-size: 0.95rem;
        }
        
        /* 联系我们 */
        .contact-content {
            display: flex;
            gap: 50px;
        }
        
        .contact-info {
            flex: 1;
        }
        
        .contact-form {
            flex: 1;
        }
        
        .contact-item {
            display: flex;
            align-items: flex-start;
            margin-bottom: 30px;
        }
        
        .contact-icon {
            background-color: var(--primary-color);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
            font-size: 1.2rem;
        }
        
        .contact-text h4 {
            font-size: 1.2rem;
            margin-bottom: 5px;
            color: var(--dark-color);
        }
        
        .contact-text p {
            color: var(--gray-color);
        }
        
        .form-group {
            margin-bottom: 20px;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--dark-color);
        }
        
        .form-group input,
        .form-group textarea {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: var(--border-radius);
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        
        .form-group input:focus,
        .form-group textarea:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
        }
        
        /* 页脚 */
        footer {
            background-color: var(--dark-color);
            color: white;
            padding: 60px 0 20px;
        }
        
        .footer-content {
            display: flex;
            justify-content: space-between;
            margin-bottom: 40px;
        }
        
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: white;
            text-decoration: none;
            margin-bottom: 20px;
            display: inline-block;
        }
        
        .footer-about {
            flex: 2;
            margin-right: 30px;
        }
        
        .footer-about p {
            color: #cbd5e1;
            margin-bottom: 20px;
        }
        
        .footer-links {
            flex: 1;
        }
        
        .footer-links h4 {
            font-size: 1.2rem;
            margin-bottom: 20px;
            color: white;
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer-links h4::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 2px;
            background-color: var(--primary-color);
        }
        
        .footer-links ul {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 10px;
        }
        
        .footer-links a {
            color: #cbd5e1;
            text-decoration: none;
            transition: var(--transition);
        }
        
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        
        .footer-bottom {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #334155;
            color: #94a3b8;
            font-size: 0.9rem;
        }
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            .about-content, .contact-content {
                flex-direction: column;
            }
            
            .about-image {
                order: -1;
            }
            
            .hero h1 {
                font-size: 2.5rem;
            }
        }
        
        @media (max-width: 768px) {
            nav ul {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: white;
                flex-direction: column;
                padding: 20px;
                box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
            }
            
            nav ul.active {
                display: flex;
            }
            
            nav li {
                margin: 10px 0;
            }
            
            .mobile-menu-btn {
                display: block;
            }
            
            .footer-content {
                flex-direction: column;
            }
            
            .footer-about {
                margin-right: 0;
                margin-bottom: 30px;
            }
            
            .hero {
                padding: 80px 0;
            }
            
            section {
                padding: 60px 0;
            }
        }
        
        @media (max-width: 576px) {
            .hero h1 {
                font-size: 2rem;
            }
            
            .section-title h2 {
                font-size: 2rem;
            }
            
            .services-grid, .news-grid {
                grid-template-columns: 1fr;
            }
            
            .about-stats {
                flex-direction: column;
                gap: 20px;
            }
        }