:root {
            --primary-color: #2563eb;
            --secondary-color: #1e40af;
            --accent-color: #3b82f6;
            --text-color: #333;
            --light-bg: #f8fafc;
            --white: #ffffff;
            --shadow: 0 4px 6px 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', 'Microsoft YaHei', sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: var(--white);
        }
        
        /* 导航栏样式 */
        header {
            position: fixed;
            top: 0;
            width: 100%;
            background-color: var(--white);
            box-shadow: var(--shadow);
            z-index: 1000;
        }
        
        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 70px;
        }
        
        .logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary-color);
            text-decoration: none;
        }
        
        .logo span {
            color: var(--secondary-color);
        }
        
        nav ul {
            display: flex;
            list-style: none;
        }
        
        nav li {
            margin-left: 2rem;
        }
        
        nav a {
            text-decoration: none;
            color: var(--text-color);
            font-weight: 500;
            padding: 5px 0;
            position: relative;
            transition: var(--transition);
        }
        
        nav a:hover {
            color: var(--primary-color);
        }
        
        nav a.active {
            color: var(--primary-color);
        }
        
        nav a.active::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 100%;
            height: 3px;
            background-color: var(--primary-color);
        }
        
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--primary-color);
        }
        
        /* 主要内容区域 */
        main {
            margin-top: 70px;
        }
        
        section {
            padding: 80px 20px;
            max-width: 1200px;
            margin: 0 auto;
        }
        
        section:nth-child(even) {
            background-color: var(--light-bg);
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 3rem;
            position: relative;
        }
        
        .section-title h2 {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        
        .section-title p {
            color: #666;
            max-width: 700px;
            margin: 0 auto;
            font-size: 1.1rem;
        }
        
        /* 首页横幅 */
        #home {
            padding: 120px 20px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            text-align: center;
            border-radius: 0 0 20px 20px;
        }
        
        #home h1 {
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }
        
        #home p {
            font-size: 1.3rem;
            max-width: 800px;
            margin: 0 auto 2rem;
            opacity: 0.9;
        }
        
        .cta-button {
            display: inline-block;
            padding: 15px 40px;
            background-color: white;
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 600;
            border-radius: 50px;
            transition: var(--transition);
            margin-top: 1rem;
            border: 2px solid white;
        }
        
        .cta-button:hover {
            background-color: transparent;
            color: white;
        }
        
        /* 关于我们部分 */
        .about-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }
        
        .about-image {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        
        .about-image img {
            width: 100%;
            height: auto;
            display: block;
            transition: var(--transition);
        }
        
        .about-image img:hover {
            transform: scale(1.03);
        }
        
        .about-text h3 {
            font-size: 1.8rem;
            margin-bottom: 1.5rem;
            color: var(--secondary-color);
        }
        
        .about-text p {
            margin-bottom: 1.5rem;
        }
        
        .values-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
            margin-top: 3rem;
        }
        
        .value-item {
            text-align: center;
            padding: 30px 20px;
            background-color: white;
            border-radius: 10px;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        
        .value-item:hover {
            transform: translateY(-10px);
        }
        
        .value-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        
        /* 公司动态部分 */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            gap: 30px;
        }
        
        .news-card {
            background-color: white;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        
        .news-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 10px 20px 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: 25px;
        }
        
        .news-date {
            color: #666;
            font-size: 0.9rem;
            margin-bottom: 10px;
            display: block;
        }
        
        .news-content h3 {
            font-size: 1.4rem;
            margin-bottom: 15px;
            color: var(--secondary-color);
        }
        
        /* 公司业务部分 */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 30px;
        }
        
        .service-card {
            background-color: white;
            padding: 40px 30px;
            border-radius: 10px;
            box-shadow: var(--shadow);
            text-align: center;
            transition: var(--transition);
        }
        
        .service-card:hover {
            transform: translateY(-10px);
            background-color: var(--primary-color);
            color: white;
        }
        
        .service-card:hover h3,
        .service-card:hover p {
            color: white;
        }
        
        .service-card:hover .service-icon {
            color: white;
        }
        
        .service-icon {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
        }
        
        .service-card h3 {
            font-size: 1.5rem;
            margin-bottom: 1rem;
            color: var(--secondary-color);
        }
        
        /* 联系我们部分 */
        .contact-container {
            display: grid;
            grid-template-columns: 1fr 2fr;
            gap: 50px;
        }
        
        .contact-info h3 {
            font-size: 1.8rem;
            margin-bottom: 2rem;
            color: var(--secondary-color);
        }
        
        .contact-item {
            margin-bottom: 2rem;
            display: flex;
            align-items: flex-start;
        }
        
        .contact-icon {
            font-size: 1.5rem;
            color: var(--primary-color);
            margin-right: 15px;
            margin-top: 5px;
        }
        
        .contact-form input,
        .contact-form textarea {
            width: 100%;
            padding: 15px;
            margin-bottom: 20px;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-family: inherit;
            font-size: 1rem;
        }
        
        .contact-form textarea {
            height: 150px;
            resize: vertical;
        }
        
        .submit-btn {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 15px 30px;
            font-size: 1rem;
            border-radius: 5px;
            cursor: pointer;
            transition: var(--transition);
            font-weight: 600;
        }
        
        .submit-btn:hover {
            background-color: var(--secondary-color);
        }
        
        /* 页脚 */
        footer {
            background-color: #1e293b;
            color: white;
            padding: 60px 20px 30px;
        }
        
        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
        }
        
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: white;
            margin-bottom: 1rem;
        }
        
        .footer-links h4 {
            font-size: 1.3rem;
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer-links h4::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 3px;
            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;
        }
        
        .copyright {
            text-align: center;
            margin-top: 50px;
            padding-top: 20px;
            border-top: 1px solid #374151;
            color: #cbd5e1;
            font-size: 0.9rem;
        }
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            .about-content,
            .contact-container {
                grid-template-columns: 1fr;
            }
            
            .footer-container {
                grid-template-columns: repeat(2, 1fr);
            }
            
            #home h1 {
                font-size: 2.8rem;
            }
        }
        
        @media (max-width: 768px) {
            nav ul {
                position: fixed;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: var(--white);
                flex-direction: column;
                align-items: center;
                padding: 20px 0;
                box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
                transform: translateY(-100%);
                opacity: 0;
                transition: var(--transition);
                z-index: 999;
            }
            
            nav ul.show {
                transform: translateY(0);
                opacity: 1;
            }
            
            nav li {
                margin: 15px 0;
            }
            
            .mobile-menu-btn {
                display: block;
            }
            
            .values-grid,
            .services-grid {
                grid-template-columns: 1fr;
            }
            
            #home h1 {
                font-size: 2.2rem;
            }
            
            #home p {
                font-size: 1.1rem;
            }
        }
        
        @media (max-width: 576px) {
            .section-title h2 {
                font-size: 2rem;
            }
            
            .news-grid {
                grid-template-columns: 1fr;
            }
            
            .footer-container {
                grid-template-columns: 1fr;
            }
        }