:root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --secondary: #10b981;
            --accent: #f59e0b;
            --dark: #1f2937;
            --darker: #111827;
            --light: #f9fafb;
            --gray: #6b7280;
            --light-gray: #f3f4f6;
            --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
            --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
            --radius: 12px;
            --transition: all 0.3s ease;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            line-height: 1.6;
            color: var(--dark);
            background-color: #ffffff;
            overflow-x: hidden;
        }

        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .section {
            padding: 100px 0;
        }

        .section-header {
            text-align: center;
            margin-bottom: 60px;
        }

        .section-subtitle {
            color: var(--primary);
            font-weight: 600;
            font-size: 18px;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 15px;
        }

        .section-title {
            font-size: 42px;
            color: var(--darker);
            margin-bottom: 20px;
            font-weight: 800;
            line-height: 1.2;
        }

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

        /* 头部导航 */
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow);
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
            transition: var(--transition);
        }

        .navbar.scrolled {
            padding: 10px 0;
        }

        .navbar-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
            transition: var(--transition);
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
        }

        .logo-icon {
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 24px;
        }

        .logo-text h1 {
            font-size: 24px;
            font-weight: 800;
            color: var(--darker);
            line-height: 1.2;
        }

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

        .logo-text p {
            font-size: 12px;
            color: var(--gray);
            letter-spacing: 1px;
        }

        .nav-menu {
            display: flex;
            list-style: none;
            gap: 40px;
        }

        .nav-link {
            text-decoration: none;
            color: var(--dark);
            font-weight: 600;
            font-size: 16px;
            transition: var(--transition);
            position: relative;
        }

        .nav-link:hover {
            color: var(--primary);
        }

        .nav-link.active {
            color: var(--primary);
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--primary);
        }

        .nav-cta {
            display: flex;
            align-items: center;
            gap: 20px;
        }

        .phone-link {
            display: flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
            color: var(--dark);
            font-weight: 600;
            transition: var(--transition);
        }

        .phone-link:hover {
            color: var(--primary);
        }

        .phone-link i {
            color: var(--primary);
        }

        .btn {
            padding: 12px 28px;
            border-radius: var(--radius);
            font-weight: 600;
            text-decoration: none;
            transition: var(--transition);
            display: inline-block;
            border: none;
            cursor: pointer;
            font-size: 16px;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: white;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
        }

        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(37, 99, 235, 0.3);
        }

        .btn-secondary {
            background-color: white;
            color: var(--primary);
            border: 2px solid var(--primary);
        }

        .btn-secondary:hover {
            background-color: var(--primary);
            color: white;
        }

        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--dark);
            cursor: pointer;
            width: 40px;
            height: 40px;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
        }

        .mobile-menu-btn:hover {
            background-color: var(--light-gray);
        }

        /* Hero区域 */
        .hero {
            background: linear-gradient(135deg, rgba(0, 0, 0, 0.85), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1558618666-fcd25c85cd64?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 180px 0 120px;
            margin-top: 90px;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 150px;
            background: linear-gradient(to top, white, transparent);
        }

        .hero-content {
            max-width: 800px;
            position: relative;
            z-index: 1;
        }

        .hero h1 {
            font-size: 56px;
            font-weight: 800;
            line-height: 1.1;
            margin-bottom: 20px;
        }

        .hero p {
            font-size: 20px;
            opacity: 0.9;
            margin-bottom: 40px;
            max-width: 600px;
        }

        .hero-btns {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }

        .hero-features {
            display: flex;
            gap: 40px;
            margin-top: 60px;
            flex-wrap: wrap;
        }

        .hero-feature {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .hero-feature i {
            font-size: 24px;
            color: var(--accent);
        }

        .hero-feature span {
            font-size: 18px;
            font-weight: 600;
        }

        /* 服务项目 */
        .services {
            background-color: var(--light);
        }

        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            gap: 30px;
        }

        .service-card {
            background: white;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
        }

        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-lg);
        }

        .service-img {
            height: 220px;
            overflow: hidden;
            position: relative;
        }

        .service-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

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

        .service-badge {
            position: absolute;
            top: 20px;
            right: 20px;
            background-color: var(--primary);
            color: white;
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
        }

        .service-content {
            padding: 30px;
        }

        .service-icon {
            width: 60px;
            height: 60px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            color: white;
            font-size: 24px;
        }

        .service-title {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 15px;
            color: var(--darker);
        }

        .service-desc {
            color: var(--gray);
            margin-bottom: 20px;
            line-height: 1.6;
        }

        .service-features {
            list-style: none;
            margin-bottom: 25px;
        }

        .service-features li {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 8px;
            color: var(--dark);
        }

        .service-features li i {
            color: var(--secondary);
        }

        /* 服务案例 */
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            gap: 30px;
        }

        .case-card {
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            position: relative;
        }

        .case-img {
            height: 250px;
            overflow: hidden;
        }

        .case-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

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

        .case-content {
            padding: 25px;
            background: white;
        }

        .case-category {
            display: inline-block;
            background-color: var(--light-gray);
            color: var(--primary);
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            margin-bottom: 15px;
        }

        .case-title {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--darker);
        }

        .case-desc {
            color: var(--gray);
            font-size: 15px;
            margin-bottom: 20px;
        }

        /* 企业介绍 */
        .about {
            background-color: var(--darker);
            color: white;
            position: relative;
            overflow: hidden;
        }

        .about::before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(37, 99, 235, 0.1) 0%, transparent 70%);
        }

        .about .section-title {
            color: white;
        }

        .about .section-desc {
            color: rgba(255, 255, 255, 0.8);
        }

        .about-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
            position: relative;
            z-index: 1;
        }

        .about-text h2 {
            font-size: 36px;
            margin-bottom: 20px;
            color: white;
        }

        .about-text p {
            margin-bottom: 20px;
            color: rgba(255, 255, 255, 0.8);
            font-size: 17px;
        }

        .about-stats {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin-top: 40px;
        }

        .stat-item {
            text-align: center;
            padding: 20px;
            background: rgba(255, 255, 255, 0.05);
            border-radius: var(--radius);
            backdrop-filter: blur(10px);
        }

        .stat-number {
            font-size: 36px;
            font-weight: 800;
            color: var(--accent);
            margin-bottom: 5px;
        }

        .stat-label {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
        }

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

        .about-img img {
            width: 100%;
            height: auto;
            display: block;
        }

        /* 页脚 */
        footer {
            background-color: var(--darker);
            color: white;
            padding: 80px 0 30px;
        }

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

        .footer-logo {
            margin-bottom: 20px;
        }

        .footer-logo h3 {
            font-size: 24px;
            margin-bottom: 5px;
        }

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

        .footer-desc {
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 20px;
        }

        .social-links {
            display: flex;
            gap: 15px;
        }

        .social-link {
            width: 40px;
            height: 40px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            text-decoration: none;
            transition: var(--transition);
        }

        .social-link:hover {
            background-color: var(--primary);
            transform: translateY(-3px);
        }

        .footer-column h4 {
            font-size: 20px;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
        }

        .footer-column h4::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 3px;
            background: var(--primary);
        }

        .footer-links {
            list-style: none;
        }

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

        .footer-links a {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 10px;
        }

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

        .contact-info {
            list-style: none;
        }

        .contact-info li {
            display: flex;
            align-items: flex-start;
            gap: 15px;
            margin-bottom: 20px;
        }

        .contact-info i {
            color: var(--primary);
            font-size: 18px;
            margin-top: 3px;
        }

        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: rgba(255, 255, 255, 0.5);
            font-size: 14px;
        }

        /* 响应式设计 */
        @media (max-width: 1024px) {
            .hero h1 {
                font-size: 48px;
            }
            
            .about-content {
                grid-template-columns: 1fr;
                gap: 40px;
            }
        }

        @media (max-width: 768px) {
            .nav-menu, .nav-cta .phone-link {
                display: none;
            }
            
            .mobile-menu-btn {
                display: flex;
            }
            
            .hero {
                padding: 150px 0 80px;
            }
            
            .hero h1 {
                font-size: 36px;
            }
            
            .hero p {
                font-size: 18px;
            }
            
            .hero-btns {
                flex-direction: column;
                align-items: flex-start;
            }
            
            .hero-features {
                flex-direction: column;
                gap: 20px;
            }
            
            .section {
                padding: 80px 0;
            }
            
            .section-title {
                font-size: 32px;
            }
            
            .services-grid, .cases-grid {
                grid-template-columns: 1fr;
            }
            
            .about-stats {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 480px) {
            .hero h1 {
                font-size: 32px;
            }
            
            .section-title {
                font-size: 28px;
            }
            
            .navbar-container {
                padding: 15px 0;
            }
            
            .footer-content {
                grid-template-columns: 1fr;
            }
        }