:root {
            --primary-color: #1a73e8;
            --secondary-color: #34a853;
            --dark-color: #202124;
            --light-color: #f8f9fa;
            --gray-color: #5f6368;
            --border-radius: 8px;
            --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #fff;
        }
        
        a {
            text-decoration: none;
            color: inherit;
        }
        
        ul {
            list-style: none;
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        .btn {
            display: inline-block;
            background-color: var(--primary-color);
            color: white;
            padding: 12px 28px;
            border-radius: var(--border-radius);
            font-weight: 600;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            font-size: 1rem;
        }
        
        .btn:hover {
            background-color: #0d5bb5;
            transform: translateY(-2px);
            box-shadow: var(--box-shadow);
        }
        
        .section {
            padding: 80px 0;
        }
        
        .section-title {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            color: var(--dark-color);
            position: relative;
        }
        
        .section-title::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -10px;
            width: 70px;
            height: 4px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }
        
        .section-subtitle {
            font-size: 1.2rem;
            color: var(--gray-color);
            margin-bottom: 3rem;
            max-width: 700px;
        }
        
        /* 头部和导航 */
        header {
            background-color: white;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
        }
        
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px;
        }
        
        .logo {
            display: flex;
            align-items: center;
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary-color);
        }
        
        .logo i {
            margin-right: 10px;
            font-size: 2rem;
        }
        
        .nav-menu {
            display: flex;
        }
        
        .nav-menu li {
            margin-left: 2rem;
        }
        
        .nav-menu a {
            font-weight: 600;
            position: relative;
            padding: 5px 0;
        }
        
        .nav-menu a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--primary-color);
            transition: var(--transition);
        }
        
        .nav-menu a:hover::after {
            width: 100%;
        }
        
        .nav-toggle {
            display: none;
            font-size: 1.5rem;
            cursor: pointer;
        }
        
        /* 首页部分 */
        #home {
            padding-top: 120px;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
        }
        
        .hero-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        
        .hero-text {
            flex: 1;
            min-width: 300px;
            padding-right: 40px;
        }
        
        .hero-text h1 {
            font-size: 3.2rem;
            line-height: 1.2;
            margin-bottom: 1.5rem;
            color: var(--dark-color);
        }
        
        .hero-text p {
            font-size: 1.2rem;
            color: var(--gray-color);
            margin-bottom: 2rem;
        }
        
        .hero-image {
            flex: 1;
            min-width: 300px;
        }
        
        .hero-image img {
            max-width: 100%;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
        }
        
        /* 关于我们部分 */
        #about {
            background-color: var(--light-color);
        }
        
        .about-content {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 40px;
        }
        
        .about-text {
            flex: 1;
            min-width: 300px;
        }
        
        .about-text p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
        }
        
        .about-stats {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            margin-top: 2rem;
        }
        
        .stat-item {
            text-align: center;
            padding: 20px;
            flex: 1;
            min-width: 150px;
        }
        
        .stat-number {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--primary-color);
            display: block;
            margin-bottom: 5px;
        }
        
        .stat-label {
            font-size: 1rem;
            color: var(--gray-color);
        }
        
        .about-image {
            flex: 1;
            min-width: 300px;
        }
        
        .about-image img {
            max-width: 100%;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
        }
        
        /* 公司动态部分 */
        .news-container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 30px;
            margin-top: 40px;
        }
        
        .news-card {
            background-color: white;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
        }
        
        .news-card:hover {
            transform: translateY(-10px);
        }
        
        .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(1.05);
        }
        
        .news-content {
            padding: 25px;
        }
        
        .news-date {
            display: inline-block;
            background-color: var(--primary-color);
            color: white;
            padding: 5px 12px;
            border-radius: 20px;
            font-size: 0.9rem;
            margin-bottom: 15px;
        }
        
        .news-title {
            font-size: 1.3rem;
            margin-bottom: 10px;
        }
        
        .news-excerpt {
            color: var(--gray-color);
            margin-bottom: 15px;
        }
        
        /* 公司业务部分 */
        #services {
            background-color: var(--light-color);
        }
        
        .services-container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 30px;
            margin-top: 40px;
        }
        
        .service-card {
            background-color: white;
            padding: 40px 30px;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            text-align: center;
            transition: var(--transition);
        }
        
        .service-card:hover {
            transform: translateY(-10px);
        }
        
        .service-icon {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        
        .service-title {
            font-size: 1.5rem;
            margin-bottom: 15px;
        }
        
        /* 联系我们部分 */
        .contact-container {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
        }
        
        .contact-info {
            flex: 1;
            min-width: 300px;
        }
        
        .contact-info-item {
            display: flex;
            align-items: flex-start;
            margin-bottom: 30px;
        }
        
        .contact-icon {
            font-size: 1.5rem;
            color: var(--primary-color);
            margin-right: 15px;
            margin-top: 5px;
        }
        
        .contact-form {
            flex: 1;
            min-width: 300px;
        }
        
        .form-group {
            margin-bottom: 20px;
        }
        
        .form-control {
            width: 100%;
            padding: 15px;
            border: 1px solid #ddd;
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        
        .form-control:focus {
            border-color: var(--primary-color);
            outline: none;
        }
        
        textarea.form-control {
            min-height: 150px;
            resize: vertical;
        }
        
        /* 页脚部分 */
        footer {
            background-color: var(--dark-color);
            color: white;
            padding: 60px 0 20px;
        }
        
        .footer-content {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            margin-bottom: 40px;
        }
        
        .footer-column {
            flex: 1;
            min-width: 250px;
            margin-bottom: 30px;
            padding-right: 20px;
        }
        
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 20px;
            color: white;
            display: flex;
            align-items: center;
        }
        
        .footer-logo i {
            margin-right: 10px;
            font-size: 2rem;
        }
        
        .footer-column h3 {
            font-size: 1.3rem;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer-column h3::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 40px;
            height: 3px;
            background-color: var(--primary-color);
        }
        
        .footer-links li {
            margin-bottom: 12px;
        }
        
        .footer-links a {
            transition: var(--transition);
        }
        
        .footer-links a:hover {
            color: var(--primary-color);
            padding-left: 5px;
        }
        
        .social-links {
            display: flex;
            margin-top: 20px;
        }
        
        .social-links a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            margin-right: 10px;
            transition: var(--transition);
        }
        
        .social-links a:hover {
            background-color: var(--primary-color);
            transform: translateY(-5px);
        }
        
        .friend-links {
            padding: 30px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            margin-bottom: 20px;
        }
        
        .friend-links h4 {
            margin-bottom: 20px;
            text-align: center;
        }
        
        .friend-links-list {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 20px;
        }
        
        .friend-links-list a {
            color: #ddd;
            transition: var(--transition);
        }
        
        .friend-links-list a:hover {
            color: var(--primary-color);
        }
        
        .copyright {
            text-align: center;
            padding-top: 20px;
            color: #aaa;
            font-size: 0.9rem;
        }
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            .hero-text h1 {
                font-size: 2.5rem;
            }
            
            .section-title {
                font-size: 2.2rem;
            }
        }
        
        @media (max-width: 768px) {
            .nav-menu {
                position: fixed;
                top: 80px;
                left: -100%;
                flex-direction: column;
                background-color: white;
                width: 100%;
                text-align: center;
                transition: var(--transition);
                box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
                padding: 20px 0;
            }
            
            .nav-menu.active {
                left: 0;
            }
            
            .nav-menu li {
                margin: 15px 0;
            }
            
            .nav-toggle {
                display: block;
            }
            
            .hero-text {
                padding-right: 0;
                margin-bottom: 40px;
            }
            
            .hero-text h1 {
                font-size: 2.2rem;
            }
            
            .section {
                padding: 60px 0;
            }
        }
        
        @media (max-width: 480px) {
            .hero-text h1 {
                font-size: 1.8rem;
            }
            
            .section-title {
                font-size: 1.8rem;
            }
            
            .btn {
                padding: 10px 20px;
            }
        }