:root {
            --primary-color: #2c5aa0;
            --secondary-color: #f8b434;
            --accent-color: #3a86ff;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
            --text-color: #333;
            --border-radius: 8px;
            --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', system-ui, -apple-system, sans-serif;
            color: var(--text-color);
            line-height: 1.6;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--primary-color);
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 40px;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 3px;
            background: var(--secondary-color);
        }
        .section-title.left-align:after {
            left: 0;
            transform: none;
        }
        .navbar {
            padding: 15px 0;
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            transition: var(--transition);
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary-color);
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .nav-link {
            font-weight: 600;
            color: var(--dark-color) !important;
            margin: 0 8px;
            position: relative;
        }
        .nav-link:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--secondary-color);
            transition: var(--transition);
        }
        .nav-link:hover:after, .nav-link.active:after {
            width: 100%;
        }
        .hero-section {
            background: linear-gradient(rgba(44, 90, 160, 0.9), rgba(58, 134, 255, 0.8)), url('https://images.unsplash.com/photo-1523050854058-8df90110c9f1?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;
            padding: 120px 0 100px;
            position: relative;
        }
        .hero-title {
            font-size: 3.2rem;
            font-weight: 800;
            margin-bottom: 25px;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
        }
        .hero-subtitle {
            font-size: 1.3rem;
            margin-bottom: 35px;
            opacity: 0.9;
            max-width: 700px;
        }
        .service-card, .product-card, .case-card {
            border: none;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            height: 100%;
        }
        .service-card:hover, .product-card:hover, .case-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }
        .service-icon {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background-color: rgba(44, 90, 160, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            color: var(--primary-color);
            font-size: 2rem;
        }
        .about-section {
            padding: 100px 0;
            background-color: #f9fbfe;
        }
        .about-img {
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            overflow: hidden;
        }
        .about-img img {
            transition: var(--transition);
        }
        .about-img:hover img {
            transform: scale(1.03);
        }
        .stats-section {
            background: linear-gradient(to right, var(--primary-color), var(--accent-color));
            color: white;
            padding: 70px 0;
        }
        .stat-item {
            text-align: center;
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            margin-bottom: 10px;
        }
        .stat-text {
            font-size: 1.1rem;
            opacity: 0.9;
        }
        .services-section {
            padding: 100px 0;
        }
        .cases-section {
            padding: 100px 0;
            background-color: #f9fbfe;
        }
        .case-card img {
            height: 220px;
            object-fit: cover;
            transition: var(--transition);
        }
        .case-card:hover img {
            transform: scale(1.05);
        }
        .news-section {
            padding: 100px 0;
        }
        .news-card {
            border: 1px solid #eee;
            border-radius: var(--border-radius);
            overflow: hidden;
            transition: var(--transition);
            height: 100%;
        }
        .news-card:hover {
            box-shadow: var(--box-shadow);
        }
        .news-date {
            background-color: var(--primary-color);
            color: white;
            padding: 8px 15px;
            border-radius: 20px;
            font-size: 0.85rem;
            display: inline-block;
            margin-bottom: 15px;
        }
        .partners-section {
            padding: 80px 0;
            background-color: #f1f5fd;
        }
        .partner-logo {
            filter: grayscale(100%);
            opacity: 0.7;
            transition: var(--transition);
            padding: 20px;
        }
        .partner-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }
        .contact-section {
            padding: 100px 0;
            background: linear-gradient(rgba(44, 90, 160, 0.05), rgba(58, 134, 255, 0.03));
        }
        .contact-info-item {
            display: flex;
            align-items: flex-start;
            margin-bottom: 30px;
        }
        .contact-icon {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background-color: rgba(44, 90, 160, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary-color);
            font-size: 1.3rem;
            margin-right: 15px;
            flex-shrink: 0;
        }
        .contact-form {
            background-color: white;
            padding: 40px;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
        }
        .footer {
            background-color: #1a2b4a;
            color: #b0c4e0;
            padding: 70px 0 20px;
        }
        .footer h5 {
            color: white;
            margin-bottom: 25px;
            font-size: 1.2rem;
        }
        .footer-links a {
            color: #b0c4e0;
            text-decoration: none;
            display: block;
            margin-bottom: 10px;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--secondary-color);
            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(--secondary-color);
            transform: translateY(-3px);
        }
        .friendlinks {
            background-color: rgba(0, 0, 0, 0.05);
            padding: 25px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        .flink {
            color: #b0c4e0;
            text-decoration: none;
            margin: 0 15px;
            transition: var(--transition);
        }
        .flink:hover {
            color: var(--secondary-color);
        }
        .copyright {
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.9rem;
            color: #8fa3c5;
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .hero-subtitle {
                font-size: 1.1rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .stat-number {
                font-size: 2.2rem;
            }
            .contact-form {
                padding: 25px;
            }
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            font-weight: 600;
            border-radius: 30px;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: var(--accent-color);
            border-color: var(--accent-color);
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(58, 134, 255, 0.3);
        }
        .btn-secondary {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            color: #333;
            padding: 12px 30px;
            font-weight: 600;
            border-radius: 30px;
            transition: var(--transition);
        }
        .btn-secondary:hover {
            background-color: #f0a500;
            border-color: #f0a500;
            color: #333;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(248, 180, 52, 0.3);
        }
        .fade-in {
            animation: fadeIn 1s ease;
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background-color: var(--primary-color);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            cursor: pointer;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--accent-color);
            transform: translateY(-5px);
        }