* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        :root {
            --primary-color: #1a5f7a;
            --secondary-color: #57cc99;
            --accent-color: #ff9a3c;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
            --gray-color: #6c757d;
        }
        
        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;
        }
        
        /* 头部与导航 */
        header {
            background-color: white;
            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;
            gap: 10px;
            font-size: 24px;
            font-weight: 700;
            color: var(--primary-color);
        }
        
        .logo i {
            color: var(--secondary-color);
        }
        
        .nav-menu {
            display: flex;
            list-style: none;
        }
        
        .nav-menu li {
            margin-left: 30px;
        }
        
        .nav-menu a {
            text-decoration: none;
            color: var(--dark-color);
            font-weight: 500;
            transition: color 0.3s;
            position: relative;
        }
        
        .nav-menu a:hover {
            color: var(--primary-color);
        }
        
        .nav-menu a.active {
            color: var(--primary-color);
        }
        
        .nav-menu a.active::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--primary-color);
        }
        
        .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;
            color: var(--primary-color);
        }
        
        .section-title h2 {
            font-size: 36px;
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
        }
        
        .section-title h2::after {
            content: '';
            position: absolute;
            width: 70px;
            height: 3px;
            background-color: var(--secondary-color);
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
        }
        
        .section-title p {
            color: var(--gray-color);
            max-width: 700px;
            margin: 0 auto;
        }
        
        /* 首页Banner */
        #home {
            background: linear-gradient(rgba(26, 95, 122, 0.9), rgba(26, 95, 122, 0.8)), url('https://images.unsplash.com/photo-1563986768494-4dee2763ff3f?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1170&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            text-align: center;
            padding: 150px 0;
            margin-top: 0;
        }
        
        .hero-content h1 {
            font-size: 48px;
            margin-bottom: 20px;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
        }
        
        .hero-content p {
            font-size: 20px;
            margin-bottom: 40px;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
            opacity: 0.9;
        }
        
        .btn {
            display: inline-block;
            background-color: var(--secondary-color);
            color: white;
            padding: 12px 30px;
            border-radius: 30px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s;
            border: none;
            cursor: pointer;
        }
        
        .btn:hover {
            background-color: #3db37c;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        /* 关于我们 */
        .about-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }
        
        .about-text h3 {
            font-size: 28px;
            margin-bottom: 20px;
            color: var(--primary-color);
        }
        
        .about-features {
            margin-top: 30px;
        }
        
        .feature-item {
            display: flex;
            align-items: flex-start;
            margin-bottom: 20px;
        }
        
        .feature-icon {
            background-color: rgba(87, 204, 153, 0.1);
            color: var(--secondary-color);
            width: 60px;
            height: 60px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            margin-right: 15px;
            flex-shrink: 0;
        }
        
        .about-image img {
            width: 100%;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        /* 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: 10px;
            padding: 30px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s, box-shadow 0.3s;
            text-align: center;
        }
        
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        
        .service-icon {
            font-size: 48px;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        
        .service-card h3 {
            font-size: 22px;
            margin-bottom: 15px;
            color: var(--primary-color);
        }
        
        /* 公司动态 */
        .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: 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: var(--secondary-color);
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 10px;
            display: block;
        }
        
        .news-content h3 {
            font-size: 20px;
            margin-bottom: 15px;
            color: var(--dark-color);
        }
        
        /* 联系我们 */
        .contact-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 50px;
        }
        
        .contact-info {
            background-color: var(--light-color);
            padding: 30px;
            border-radius: 10px;
        }
        
        .contact-item {
            display: flex;
            align-items: flex-start;
            margin-bottom: 25px;
        }
        
        .contact-icon {
            background-color: white;
            color: var(--primary-color);
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            margin-right: 15px;
            flex-shrink: 0;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
        }
        
        .contact-form input,
        .contact-form textarea {
            width: 100%;
            padding: 15px;
            margin-bottom: 20px;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-size: 16px;
        }
        
        .contact-form textarea {
            height: 150px;
            resize: vertical;
        }
        
        /* 底部与友情链接 */
        footer {
            background-color: var(--dark-color);
            color: white;
            padding: 60px 0 30px;
        }
        
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        
        .footer-logo {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 20px;
            color: white;
        }
        
        .footer-links h3 {
            font-size: 20px;
            margin-bottom: 20px;
            color: white;
        }
        
        .footer-links ul {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 10px;
        }
        
        .footer-links a {
            color: #bbb;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-links a:hover {
            color: var(--secondary-color);
        }
        
        .friend-links {
            background-color: rgba(255, 255, 255, 0.05);
            padding: 20px;
            border-radius: 5px;
            margin-top: 20px;
        }
        
        .friend-links h4 {
            margin-bottom: 15px;
            color: var(--secondary-color);
        }
        
        .friend-links-container {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
        }
        
        .friend-link {
            color: #bbb;
            text-decoration: none;
            padding: 5px 10px;
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 3px;
            font-size: 14px;
            transition: all 0.3s;
        }
        
        .friend-link:hover {
            color: var(--secondary-color);
            border-color: var(--secondary-color);
        }
        
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: #bbb;
            font-size: 14px;
        }
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            .about-content {
                grid-template-columns: 1fr;
            }
            
            .hero-content h1 {
                font-size: 40px;
            }
        }
        
        @media (max-width: 768px) {
            .nav-menu {
                position: fixed;
                top: 80px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 80px);
                background-color: white;
                flex-direction: column;
                align-items: center;
                justify-content: flex-start;
                padding-top: 40px;
                transition: left 0.3s;
            }
            
            .nav-menu.active {
                left: 0;
            }
            
            .nav-menu li {
                margin: 0 0 30px 0;
            }
            
            .mobile-toggle {
                display: block;
            }
            
            .hero-content h1 {
                font-size: 32px;
            }
            
            .hero-content p {
                font-size: 18px;
            }
            
            .section-title h2 {
                font-size: 30px;
            }
        }
        
        @media (max-width: 576px) {
            section {
                padding: 60px 0;
            }
            
            .hero-content {
                padding: 0 15px;
            }
            
            .services-grid,
            .news-grid {
                grid-template-columns: 1fr;
            }
        }