* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Noto Sans SC', sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f8f9fa;
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 头部和导航 */
        header {
            background-color: #fff;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
        }
        
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        
        .logo {
            display: flex;
            align-items: center;
        }
        
        .logo h1 {
            font-size: 24px;
            color: #2c3e50;
            font-weight: 700;
        }
        
        .logo span {
            color: #3498db;
        }
        
        nav ul {
            display: flex;
            list-style: none;
        }
        
        nav ul li {
            margin-left: 30px;
        }
        
        nav ul li a {
            text-decoration: none;
            color: #333;
            font-weight: 500;
            font-size: 16px;
            transition: color 0.3s;
            position: relative;
        }
        
        nav ul li a:hover {
            color: #3498db;
        }
        
        nav ul li a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background-color: #3498db;
            transition: width 0.3s;
        }
        
        nav ul li a:hover::after {
            width: 100%;
        }
        
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: #333;
            cursor: pointer;
        }
        
        /* 主要区域 */
        main {
            margin-top: 80px;
        }
        
        section {
            padding: 80px 0;
        }
        
        section:nth-child(even) {
            background-color: #fff;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 50px;
        }
        
        .section-title h2 {
            font-size: 36px;
            color: #2c3e50;
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
        }
        
        .section-title h2::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 3px;
            background-color: #3498db;
        }
        
        .section-title p {
            color: #666;
            font-size: 18px;
            max-width: 700px;
            margin: 0 auto;
        }
        
        /* 首页横幅 */
        #home {
            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;
            color: white;
            text-align: center;
            padding: 150px 0;
            margin-top: 0;
        }
        
        #home h1 {
            font-size: 48px;
            margin-bottom: 20px;
        }
        
        #home p {
            font-size: 20px;
            margin-bottom: 30px;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }
        
        .cta-button {
            display: inline-block;
            background-color: #3498db;
            color: white;
            padding: 15px 40px;
            border-radius: 5px;
            text-decoration: none;
            font-weight: 500;
            font-size: 18px;
            transition: background-color 0.3s;
            margin-top: 20px;
        }
        
        .cta-button:hover {
            background-color: #2980b9;
        }
        
        /* 关于我们 */
        .about-content {
            display: flex;
            align-items: center;
            gap: 50px;
        }
        
        .about-text {
            flex: 1;
        }
        
        .about-text h3 {
            font-size: 28px;
            color: #2c3e50;
            margin-bottom: 20px;
        }
        
        .about-text p {
            margin-bottom: 20px;
            color: #555;
        }
        
        .about-stats {
            display: flex;
            justify-content: space-between;
            margin-top: 30px;
        }
        
        .stat-item {
            text-align: center;
        }
        
        .stat-item .number {
            font-size: 36px;
            font-weight: 700;
            color: #3498db;
            display: block;
        }
        
        .stat-item .label {
            color: #666;
            font-size: 16px;
        }
        
        .about-image {
            flex: 1;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        
        .about-image img {
            width: 100%;
            height: auto;
            display: block;
        }
        
        /* 公司业务 */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }
        
        .service-card {
            background-color: #fff;
            border-radius: 10px;
            padding: 30px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: transform 0.3s, box-shadow 0.3s;
            border-top: 4px solid #3498db;
        }
        
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        
        .service-icon {
            font-size: 40px;
            color: #3498db;
            margin-bottom: 20px;
        }
        
        .service-card h3 {
            font-size: 22px;
            margin-bottom: 15px;
            color: #2c3e50;
        }
        
        .service-card p {
            color: #666;
            margin-bottom: 15px;
        }
        
        /* 公司动态 */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 30px;
        }
        
        .news-card {
            background-color: #fff;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        
        .news-image {
            height: 200px;
            overflow: hidden;
        }
        
        .news-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }
        
        .news-card:hover .news-image img {
            transform: scale(1.05);
        }
        
        .news-content {
            padding: 25px;
        }
        
        .news-date {
            color: #3498db;
            font-size: 14px;
            margin-bottom: 10px;
        }
        
        .news-content h3 {
            font-size: 20px;
            margin-bottom: 15px;
            color: #2c3e50;
        }
        
        .news-content p {
            color: #666;
            margin-bottom: 15px;
        }
        
        .read-more {
            color: #3498db;
            text-decoration: none;
            font-weight: 500;
            display: inline-flex;
            align-items: center;
        }
        
        .read-more i {
            margin-left: 5px;
            transition: transform 0.3s;
        }
        
        .read-more:hover i {
            transform: translateX(5px);
        }
        
        /* 联系我们 */
        .contact-container {
            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: #3498db;
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
            flex-shrink: 0;
        }
        
        .contact-details h4 {
            font-size: 20px;
            margin-bottom: 5px;
            color: #2c3e50;
        }
        
        .contact-details p {
            color: #666;
        }
        
        .form-group {
            margin-bottom: 20px;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 8px;
            color: #555;
            font-weight: 500;
        }
        
        .form-group input,
        .form-group textarea {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-family: 'Noto Sans SC', sans-serif;
            font-size: 16px;
        }
        
        .form-group textarea {
            height: 150px;
            resize: vertical;
        }
        
        .submit-btn {
            background-color: #3498db;
            color: white;
            border: none;
            padding: 15px 40px;
            border-radius: 5px;
            font-size: 16px;
            font-weight: 500;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        
        .submit-btn:hover {
            background-color: #2980b9;
        }
        
        /* 底部 */
        footer {
            background-color: #2c3e50;
            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-column h3 {
            font-size: 20px;
            margin-bottom: 20px;
            color: #fff;
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer-column h3::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 2px;
            background-color: #3498db;
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 10px;
        }
        
        .footer-links a {
            color: #bdc3c7;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-links a:hover {
            color: #3498db;
        }
        
        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
        }
        
        .friend-links a {
            background-color: rgba(255,255,255,0.1);
            color: #bdc3c7;
            padding: 8px 15px;
            border-radius: 3px;
            text-decoration: none;
            transition: background-color 0.3s;
            font-size: 14px;
        }
        
        .friend-links a:hover {
            background-color: rgba(255,255,255,0.2);
            color: white;
        }
        
        .footer-bottom {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #bdc3c7;
            font-size: 14px;
        }
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            .about-content {
                flex-direction: column;
            }
            
            .contact-container {
                flex-direction: column;
            }
        }
        
        @media (max-width: 768px) {
            nav ul {
                display: none;
                position: absolute;
                top: 70px;
                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.show {
                display: flex;
            }
            
            nav ul li {
                margin: 10px 0;
            }
            
            .mobile-menu-btn {
                display: block;
            }
            
            #home h1 {
                font-size: 36px;
            }
            
            .section-title h2 {
                font-size: 30px;
            }
            
            .footer-content {
                flex-direction: column;
            }
        }
        
        /* 锚点滚动平滑效果 */
        html {
            scroll-behavior: smooth;
        }
        
        /* 高亮当前导航项 */
        .nav-active {
            color: #3498db;
        }
        
        .nav-active::after {
            width: 100% !important;
        }