:root {
            --primary-color: #2563eb;
            --secondary-color: #7c3aed;
            --accent-color: #06b6d4;
            --dark-color: #1e293b;
            --light-color: #f8fafc;
            --text-color: #334155;
            --border-radius: 12px;
            --box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--text-color);
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--dark-color);
            margin-bottom: 1rem;
        }
        .section-padding {
            padding-top: 5rem;
            padding-bottom: 5rem;
        }
        @media (max-width: 768px) {
            .section-padding {
                padding-top: 3rem;
                padding-bottom: 3rem;
            }
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.05);
            padding-top: 1rem;
            padding-bottom: 1rem;
            transition: var(--transition);
        }
        .navbar.scrolled {
            padding-top: 0.7rem;
            padding-bottom: 0.7rem;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .nav-link {
            font-weight: 600;
            margin: 0 0.5rem;
            color: var(--dark-color);
            position: relative;
            transition: var(--transition);
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color);
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--primary-color);
            transition: var(--transition);
        }
        .nav-link:hover::after, .nav-link.active::after {
            width: 100%;
        }
        .hero-section {
            background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
            padding-top: 8rem;
            padding-bottom: 6rem;
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 70%;
            height: 150%;
            background: radial-gradient(circle, rgba(37, 99, 235, 0.1) 0%, rgba(37, 99, 235, 0) 70%);
            border-radius: 50%;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 1.5rem;
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
        }
        .hero-subtitle {
            font-size: 1.2rem;
            color: var(--text-color);
            margin-bottom: 2rem;
            max-width: 600px;
        }
        .feature-card {
            background: white;
            border-radius: var(--border-radius);
            padding: 2.5rem;
            height: 100%;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            border: 1px solid #e2e8f0;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
        }
        .card-icon {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            font-size: 1.8rem;
        }
        .service-card {
            background: white;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            height: 100%;
        }
        .service-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
        }
        .service-img {
            height: 220px;
            object-fit: cover;
            width: 100%;
        }
        .service-content {
            padding: 2rem;
        }
        .btn-primary-custom {
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            border: none;
            color: white;
            padding: 0.8rem 2rem;
            border-radius: 50px;
            font-weight: 600;
            transition: var(--transition);
            box-shadow: 0 5px 15px rgba(37, 99, 235, 0.3);
        }
        .btn-primary-custom:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(37, 99, 235, 0.4);
            color: white;
        }
        .btn-secondary-custom {
            background: transparent;
            border: 2px solid var(--primary-color);
            color: var(--primary-color);
            padding: 0.8rem 2rem;
            border-radius: 50px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-secondary-custom:hover {
            background-color: var(--primary-color);
            color: white;
        }
        .about-section {
            background-color: #f8fafc;
        }
        .stats-box {
            text-align: center;
            padding: 2rem;
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
        }
        .stats-number {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--primary-color);
            line-height: 1;
            margin-bottom: 0.5rem;
        }
        .product-tabs .nav-link {
            border: none;
            color: var(--text-color);
            font-weight: 600;
            padding: 1rem 1.5rem;
            border-radius: 50px;
            margin: 0 0.5rem;
        }
        .product-tabs .nav-link.active {
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            color: white;
        }
        .case-study {
            position: relative;
            border-radius: var(--border-radius);
            overflow: hidden;
            height: 350px;
            margin-bottom: 2rem;
        }
        .case-study img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .case-study:hover img {
            transform: scale(1.05);
        }
        .case-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
            color: white;
            padding: 2rem;
            transform: translateY(30px);
            transition: var(--transition);
        }
        .case-study:hover .case-overlay {
            transform: translateY(0);
        }
        .news-card {
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            height: 100%;
            background: white;
        }
        .news-card:hover {
            transform: translateY(-8px);
        }
        .news-date {
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 0.5rem 1rem;
            border-radius: 50px;
            display: inline-block;
            font-weight: 600;
            font-size: 0.9rem;
        }
        .team-card {
            text-align: center;
            padding: 2rem;
            border-radius: var(--border-radius);
            background: white;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
        }
        .team-card:hover {
            transform: translateY(-10px);
        }
        .team-img {
            width: 150px;
            height: 150px;
            border-radius: 50%;
            object-fit: cover;
            margin: 0 auto 1.5rem;
            border: 5px solid #f1f5f9;
        }
        .contact-form .form-control {
            padding: 1rem;
            border-radius: 10px;
            border: 1px solid #cbd5e1;
            transition: var(--transition);
        }
        .contact-form .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(37, 99, 235, 0.25);
        }
        .contact-info-box {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 2.5rem;
            border-radius: var(--border-radius);
            height: 100%;
        }
        footer {
            background-color: var(--dark-color);
            color: #cbd5e1;
            padding-top: 4rem;
        }
        .footer-title {
            color: white;
            font-size: 1.2rem;
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 0.8rem;
        }
        .footer-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 3px;
            background: var(--primary-color);
        }
        .footer-links a {
            color: #cbd5e1;
            text-decoration: none;
            display: block;
            margin-bottom: 0.8rem;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .social-links a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: rgba(255, 255, 255, 0.1);
            color: white;
            margin-right: 10px;
            transition: var(--transition);
        }
        .social-links a:hover {
            background-color: var(--primary-color);
            transform: translateY(-3px);
        }
        .copyright {
            border-top: 1px solid #334155;
            padding-top: 1.5rem;
            padding-bottom: 1.5rem;
            margin-top: 3rem;
        }
        friendlink {
            display: block;
            padding: 2rem 0;
            background-color: #f8fafc;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 0.8rem 1.5rem;
            margin: 0.5rem;
            border-radius: 8px;
            color: var(--dark-color);
            text-decoration: none;
            font-weight: 500;
            transition: var(--transition);
            border: 1px solid #e2e8f0;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            border-color: var(--primary-color);
        }
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .animate-fade-in-up {
            animation: fadeInUp 0.8s ease forwards;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 1000;
            box-shadow: 0 5px 15px rgba(37, 99, 235, 0.3);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--secondary-color);
            transform: translateY(-5px);
        }
        @media (max-width: 992px) {
            .hero-title {
                font-size: 2.8rem;
            }
            .stats-number {
                font-size: 2.2rem;
            }
        }
        @media (max-width: 768px) {
            .hero-section {
                padding-top: 6rem;
                padding-bottom: 4rem;
            }
            .navbar-nav {
                text-align: center;
                padding-top: 1rem;
            }
            .nav-link {
                margin: 0.3rem 0;
            }
        }