:root {
            --primary-color: #1a365d;
            --secondary-color: #2d6bc4;
            --accent-color: #e63946;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
            --gray-color: #6c757d;
            --transition: all 0.3s ease;
            --shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            --border-radius: 8px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            line-height: 1.6;
            color: var(--dark-color);
            background-color: #fff;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 导航栏样式 */
        header {
            background-color: white;
            box-shadow: var(--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: 28px;
            font-weight: 700;
            color: var(--primary-color);
            text-decoration: none;
        }

        .logo span {
            color: var(--secondary-color);
        }

        nav ul {
            display: flex;
            list-style: none;
        }

        nav ul li {
            margin-left: 30px;
        }

        nav ul li a {
            text-decoration: none;
            color: var(--dark-color);
            font-weight: 600;
            font-size: 16px;
            transition: var(--transition);
            padding: 5px 0;
            position: relative;
        }

        nav ul li a:hover {
            color: var(--secondary-color);
        }

        nav ul li a.active {
            color: var(--secondary-color);
        }

        nav ul li a.active::after {
            content: '';
            position: absolute;
            width: 100%;
            height: 3px;
            background-color: var(--secondary-color);
            bottom: -5px;
            left: 0;
        }

        .mobile-toggle {
            display: none;
            font-size: 24px;
            cursor: pointer;
        }

        /* 主内容区域 */
        main {
            margin-top: 80px;
        }

        section {
            padding: 80px 0;
        }

        .section-title {
            text-align: center;
            margin-bottom: 50px;
        }

        .section-title h2 {
            font-size: 36px;
            color: var(--primary-color);
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
        }

        .section-title h2::after {
            content: '';
            position: absolute;
            width: 70px;
            height: 4px;
            background-color: var(--accent-color);
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
        }

        .section-title p {
            color: var(--gray-color);
            max-width: 700px;
            margin: 0 auto;
            font-size: 18px;
        }

        /* 首页区域 */
        #home {
            background: linear-gradient(rgba(26, 54, 93, 0.9), rgba(26, 54, 93, 0.9)), 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;
            color: white;
            padding: 150px 0;
            text-align: center;
        }

        #home h1 {
            font-size: 48px;
            margin-bottom: 20px;
            line-height: 1.2;
        }

        #home p {
            font-size: 20px;
            max-width: 800px;
            margin: 0 auto 30px;
            opacity: 0.9;
        }

        .btn {
            display: inline-block;
            background-color: var(--accent-color);
            color: white;
            padding: 14px 32px;
            border-radius: var(--border-radius);
            text-decoration: none;
            font-weight: 600;
            font-size: 16px;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }

        .btn:hover {
            background-color: #c1121f;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
        }

        /* 关于我们区域 */
        .about-content {
            display: flex;
            align-items: center;
            gap: 50px;
        }

        .about-img {
            flex: 1;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--shadow);
        }

        .about-img img {
            width: 100%;
            height: auto;
            display: block;
            transition: var(--transition);
        }

        .about-img img:hover {
            transform: scale(1.05);
        }

        .about-text {
            flex: 1;
        }

        .about-text h3 {
            font-size: 28px;
            color: var(--primary-color);
            margin-bottom: 20px;
        }

        .about-text p {
            margin-bottom: 20px;
            color: var(--gray-color);
        }

        /* 公司动态区域 */
        #news {
            background-color: #f8f9fa;
        }

        .news-container {
            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(--shadow);
            transition: var(--transition);
        }

        .news-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }

        .news-img {
            height: 200px;
            overflow: hidden;
        }

        .news-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }

        .news-card:hover .news-img img {
            transform: scale(1.1);
        }

        .news-content {
            padding: 25px;
        }

        .news-date {
            color: var(--secondary-color);
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 10px;
            display: block;
        }

        .news-content h3 {
            font-size: 20px;
            color: var(--primary-color);
            margin-bottom: 15px;
            line-height: 1.4;
        }

        .news-content p {
            color: var(--gray-color);
            margin-bottom: 15px;
        }

        .read-more {
            color: var(--secondary-color);
            font-weight: 600;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
        }

        .read-more i {
            margin-left: 5px;
            transition: var(--transition);
        }

        .read-more:hover i {
            transform: translateX(5px);
        }

        /* 公司业务区域 */
        .services-container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            gap: 30px;
        }

        .service-card {
            background-color: white;
            padding: 40px 30px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            transition: var(--transition);
            text-align: center;
        }

        .service-card:hover {
            transform: translateY(-10px);
            background-color: var(--primary-color);
            color: white;
        }

        .service-card:hover h3,
        .service-card:hover p {
            color: white;
        }

        .service-icon {
            width: 80px;
            height: 80px;
            background-color: rgba(45, 107, 196, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 25px;
            color: var(--secondary-color);
            font-size: 36px;
        }

        .service-card:hover .service-icon {
            background-color: rgba(255, 255, 255, 0.2);
            color: white;
        }

        .service-card h3 {
            font-size: 22px;
            color: var(--primary-color);
            margin-bottom: 15px;
        }

        .service-card p {
            color: var(--gray-color);
        }

        /* 联系我们区域 */
        #contact {
            background-color: #f8f9fa;
        }

        .contact-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 50px;
        }

        .contact-info h3 {
            font-size: 24px;
            color: var(--primary-color);
            margin-bottom: 25px;
        }

        .contact-item {
            display: flex;
            margin-bottom: 25px;
        }

        .contact-icon {
            width: 50px;
            height: 50px;
            background-color: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            margin-right: 15px;
            flex-shrink: 0;
        }

        .contact-details h4 {
            font-size: 18px;
            color: var(--primary-color);
            margin-bottom: 5px;
        }

        .contact-form input,
        .contact-form textarea {
            width: 100%;
            padding: 15px;
            margin-bottom: 20px;
            border: 1px solid #ddd;
            border-radius: var(--border-radius);
            font-size: 16px;
            transition: var(--transition);
        }

        .contact-form input:focus,
        .contact-form textarea:focus {
            border-color: var(--secondary-color);
            outline: none;
        }

        .contact-form textarea {
            height: 150px;
            resize: vertical;
        }

        /* 底部区域 */
        footer {
            background-color: var(--primary-color);
            color: white;
            padding: 70px 0 20px;
        }

        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 50px;
        }

        .footer-logo {
            font-size: 28px;
            font-weight: 700;
            color: white;
            margin-bottom: 20px;
            display: block;
        }

        .footer-logo span {
            color: var(--secondary-color);
        }

        .footer-about p {
            margin-bottom: 20px;
            opacity: 0.8;
        }

        .footer-links h3,
        .footer-services h3 {
            font-size: 20px;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
        }

        .footer-links h3::after,
        .footer-services h3::after {
            content: '';
            position: absolute;
            width: 50px;
            height: 3px;
            background-color: var(--accent-color);
            bottom: 0;
            left: 0;
        }

        .footer-links ul,
        .footer-services ul {
            list-style: none;
        }

        .footer-links li,
        .footer-services li {
            margin-bottom: 12px;
        }

        .footer-links a,
        .footer-services a {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
            transition: var(--transition);
        }

        .footer-links a:hover,
        .footer-services a:hover {
            color: white;
            padding-left: 5px;
        }

        .friend-links {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 30px;
            text-align: center;
        }

        .friend-links h3 {
            font-size: 18px;
            margin-bottom: 20px;
            color: rgba(255, 255, 255, 0.9);
        }

        .friend-links-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 15px;
        }

        .friend-link {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            padding: 5px 15px;
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: 30px;
            transition: var(--transition);
        }

        .friend-link:hover {
            color: white;
            border-color: var(--accent-color);
            background-color: rgba(230, 57, 70, 0.1);
        }

        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            margin-top: 30px;
            font-size: 14px;
            opacity: 0.7;
        }

        /* 响应式设计 */
        @media (max-width: 992px) {
            .about-content {
                flex-direction: column;
            }
            
            .about-img, .about-text {
                width: 100%;
            }
            
            #home h1 {
                font-size: 40px;
            }
        }

        @media (max-width: 768px) {
            nav ul {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: white;
                flex-direction: column;
                padding: 20px 0;
                box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
            }
            
            nav ul.active {
                display: flex;
            }
            
            nav ul li {
                margin: 0;
                text-align: center;
            }
            
            nav ul li a {
                display: block;
                padding: 15px 0;
            }
            
            .mobile-toggle {
                display: block;
            }
            
            .section-title h2 {
                font-size: 30px;
            }
            
            #home {
                padding: 120px 0;
            }
            
            #home h1 {
                font-size: 32px;
            }
            
            section {
                padding: 60px 0;
            }
        }

        @media (max-width: 576px) {
            .services-container,
            .news-container {
                grid-template-columns: 1fr;
            }
            
            .contact-container {
                grid-template-columns: 1fr;
            }
        }