:root {
            --primary-color: #1a237e;
            --secondary-color: #2196f3;
            --accent-color: #ff4081;
            --text-color: #333;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --gray-color: #6c757d;
            --border-radius: 8px;
            --box-shadow: 0 5px 15px 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);
            overflow-x: hidden;
        }
        
        h1, h2, h3, h4 {
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 1rem;
            color: var(--primary-color);
        }
        
        p {
            margin-bottom: 1rem;
        }
        
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        
        ul {
            list-style: none;
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        .section {
            padding: 80px 0;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 50px;
            position: relative;
        }
        
        .section-title:after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        
        .btn {
            display: inline-block;
            padding: 12px 28px;
            background: var(--secondary-color);
            color: white;
            border-radius: var(--border-radius);
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: var(--transition);
        }
        
        .btn:hover {
            background: var(--primary-color);
            transform: translateY(-3px);
            box-shadow: var(--box-shadow);
        }
        
        /* 导航栏 */
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            transition: var(--transition);
        }
        
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px;
        }
        
        .logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-color);
            display: flex;
            align-items: center;
        }
        
        .logo i {
            color: var(--secondary-color);
            margin-right: 10px;
        }
        
        .nav-list {
            display: flex;
        }
        
        .nav-list li {
            margin-left: 30px;
        }
        
        .nav-list a {
            font-weight: 600;
            position: relative;
            padding: 5px 0;
        }
        
        .nav-list a:after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            background: var(--secondary-color);
            bottom: 0;
            left: 0;
            transition: var(--transition);
        }
        
        .nav-list a:hover:after {
            width: 100%;
        }
        
        .nav-list a.active {
            color: var(--secondary-color);
        }
        
        .nav-list a.active:after {
            width: 100%;
        }
        
        .mobile-menu-btn {
            display: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--primary-color);
        }
        
        /* 首页横幅 */
        .hero {
            height: 100vh;
            background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1552664730-d307ca884978?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2070&q=80');
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            display: flex;
            align-items: center;
            text-align: center;
            color: white;
            padding-top: 80px;
        }
        
        .hero-content {
            max-width: 800px;
            margin: 0 auto;
        }
        
        .hero h1 {
            font-size: 3.5rem;
            margin-bottom: 20px;
            color: white;
        }
        
        .hero p {
            font-size: 1.2rem;
            margin-bottom: 30px;
            color: rgba(255, 255, 255, 0.9);
        }
        
        .hero .btn {
            font-size: 1.1rem;
            padding: 15px 35px;
            background: var(--secondary-color);
        }
        
        .hero .btn:hover {
            background: var(--accent-color);
        }
        
        /* 关于我们 */
        .about {
            background: var(--light-color);
        }
        
        .about-content {
            display: flex;
            align-items: center;
            gap: 50px;
        }
        
        .about-text {
            flex: 1;
        }
        
        .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;
            transition: var(--transition);
        }
        
        .about-image:hover img {
            transform: scale(1.05);
        }
        
        /* 公司动态 */
        .news {
            background: white;
        }
        
        .news-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 30px;
        }
        
        .news-card {
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
        }
        
        .news-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }
        
        .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(1.1);
        }
        
        .news-content {
            padding: 20px;
        }
        
        .news-date {
            color: var(--gray-color);
            font-size: 0.9rem;
            margin-bottom: 10px;
        }
        
        /* 公司业务 */
        .services {
            background: var(--light-color);
        }
        
        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 30px;
        }
        
        .service-card {
            background: white;
            padding: 30px;
            border-radius: var(--border-radius);
            text-align: center;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
        }
        
        .service-card:hover {
            transform: translateY(-10px);
        }
        
        .service-icon {
            font-size: 3rem;
            color: var(--secondary-color);
            margin-bottom: 20px;
        }
        
        /* 联系我们 */
        .contact {
            background: white;
        }
        
        .contact-content {
            display: flex;
            gap: 50px;
        }
        
        .contact-info {
            flex: 1;
        }
        
        .contact-form {
            flex: 1;
        }
        
        .contact-item {
            display: flex;
            align-items: center;
            margin-bottom: 25px;
        }
        
        .contact-icon {
            width: 50px;
            height: 50px;
            background: var(--light-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
            color: var(--secondary-color);
            font-size: 1.2rem;
        }
        
        .form-group {
            margin-bottom: 20px;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
        }
        
        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: var(--border-radius);
            font-family: inherit;
            transition: var(--transition);
        }
        
        .form-control:focus {
            outline: none;
            border-color: var(--secondary-color);
        }
        
        /* 底部 */
        footer {
            background: var(--dark-color);
            color: white;
            padding: 60px 0 30px;
        }
        
        .footer-content {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            margin-bottom: 40px;
        }
        
        .footer-column {
            flex: 1;
            min-width: 250px;
            margin-bottom: 30px;
        }
        
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 800;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
        }
        
        .footer-logo i {
            color: var(--secondary-color);
            margin-right: 10px;
        }
        
        .footer-column h3 {
            color: white;
            margin-bottom: 25px;
            font-size: 1.3rem;
            position: relative;
        }
        
        .footer-column h3:after {
            content: '';
            position: absolute;
            width: 40px;
            height: 3px;
            background: var(--secondary-color);
            bottom: -10px;
            left: 0;
        }
        
        .footer-links li {
            margin-bottom: 12px;
        }
        
        .footer-links a:hover {
            color: var(--secondary-color);
            padding-left: 5px;
        }
        
        .social-links {
            display: flex;
            gap: 15px;
            margin-top: 20px;
        }
        
        .social-links a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            font-size: 1.2rem;
        }
        
        .social-links a:hover {
            background: var(--secondary-color);
            transform: translateY(-5px);
        }
        
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.9rem;
        }
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            .about-content,
            .contact-content {
                flex-direction: column;
            }
            
            .hero h1 {
                font-size: 2.8rem;
            }
        }
        
        @media (max-width: 768px) {
            .nav-list {
                position: fixed;
                top: 70px;
                left: 0;
                width: 100%;
                background: white;
                flex-direction: column;
                align-items: center;
                padding: 20px 0;
                box-shadow: 0 10px 10px rgba(0, 0, 0, 0.1);
                transform: translateY(-100%);
                opacity: 0;
                visibility: hidden;
                transition: var(--transition);
            }
            
            .nav-list.active {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
            }
            
            .nav-list li {
                margin: 15px 0;
            }
            
            .mobile-menu-btn {
                display: block;
            }
            
            .hero h1 {
                font-size: 2.3rem;
            }
            
            .section {
                padding: 60px 0;
            }
        }
        
        @media (max-width: 576px) {
            .hero h1 {
                font-size: 2rem;
            }
            
            .section-title {
                font-size: 1.8rem;
            }
        }