:root {
            --primary-color: #0d6efd;
            --secondary-color: #6c757d;
            --dark-color: #212529;
            --light-color: #f8f9fa;
            --success-color: #198754;
            --warning-color: #ffc107;
            --danger-color: #dc3545;
            --info-color: #0dcaf0;
            --primary-gradient: linear-gradient(135deg, #0d6efd 0%, #6610f2 100%);
            --shadow-light: 0 5px 15px rgba(0, 0, 0, 0.05);
            --shadow-medium: 0 8px 25px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            color: #333;
            overflow-x: hidden;
            line-height: 1.7;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            margin-bottom: 1rem;
        }
        .section-header {
            text-align: center;
            margin-bottom: 4rem;
        }
        .section-header h2 {
            font-size: 2.8rem;
            position: relative;
            display: inline-block;
            padding-bottom: 1rem;
        }
        .section-header h2:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--primary-gradient);
            border-radius: 2px;
        }
        .section-subtitle {
            color: var(--secondary-color);
            font-size: 1.1rem;
            max-width: 700px;
            margin: 0 auto;
        }
        .navbar {
            padding: 1.2rem 0;
            background-color: rgba(255, 255, 255, 0.98) !important;
            box-shadow: var(--shadow-light);
            transition: var(--transition);
        }
        .navbar.scrolled {
            padding: 0.8rem 0;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .nav-link {
            font-weight: 600;
            margin: 0 0.5rem;
            position: relative;
        }
        .nav-link:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary-gradient);
            transition: var(--transition);
        }
        .nav-link:hover:after, .nav-link.active:after {
            width: 100%;
        }
        .hero-section {
            background: var(--primary-gradient) url('https://images.unsplash.com/photo-1558494949-ef010cbdcc31?ixlib=rb-4.0.3&auto=format&fit=crop&w=1950&q=80') center/cover no-repeat;
            background-blend-mode: overlay;
            color: white;
            padding: 10rem 0 8rem;
            position: relative;
        }
        .hero-content h1 {
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
            text-shadow: 0 2px 10px rgba(0,0,0,0.2);
        }
        .hero-content p {
            font-size: 1.3rem;
            margin-bottom: 2rem;
            opacity: 0.9;
        }
        .btn-primary-custom {
            background: var(--primary-gradient);
            border: none;
            color: white;
            padding: 0.8rem 2.5rem;
            border-radius: 50px;
            font-weight: 600;
            transition: var(--transition);
            box-shadow: 0 4px 15px rgba(13, 110, 253, 0.3);
        }
        .btn-primary-custom:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(13, 110, 253, 0.4);
            color: white;
        }
        .service-card, .case-card, .news-card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: var(--shadow-light);
            transition: var(--transition);
            height: 100%;
            background: white;
        }
        .service-card:hover, .case-card:hover, .news-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-medium);
        }
        .service-icon {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: var(--primary-gradient);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: -40px auto 1.5rem;
            color: white;
            font-size: 2rem;
            box-shadow: 0 5px 15px rgba(13, 110, 253, 0.3);
        }
        .stats-section {
            background: var(--primary-gradient);
            color: white;
            padding: 5rem 0;
        }
        .stat-item h3 {
            font-size: 3rem;
            font-weight: 800;
            margin-bottom: 0.5rem;
        }
        .team-member img {
            border-radius: 15px;
            transition: var(--transition);
        }
        .team-member:hover img {
            transform: scale(1.05);
        }
        .footer {
            background-color: var(--dark-color);
            color: #adb5bd;
            padding-top: 4rem;
            padding-bottom: 2rem;
        }
        .footer a {
            color: #adb5bd;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer a:hover {
            color: white;
        }
        .footer-links h5 {
            color: white;
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 0.8rem;
        }
        .footer-links h5:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 2px;
            background: var(--primary-color);
        }
        .copyright {
            border-top: 1px solid #495057;
            padding-top: 1.5rem;
            margin-top: 3rem;
        }
        .flink {
            display: inline-block;
            background: #f1f3f4;
            color: #495057;
            padding: 0.5rem 1.5rem;
            border-radius: 30px;
            margin: 0.5rem;
            text-decoration: none;
            font-weight: 500;
            transition: var(--transition);
            border: 1px solid #dee2e6;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-2px);
        }
        .friendlink {
            background-color: #f8f9fa;
            padding: 4rem 0;
        }
        #backToTop {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-gradient);
            color: white;
            border: none;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 1000;
            box-shadow: 0 4px 15px rgba(0,0,0,0.2);
        }
        #backToTop.show {
            opacity: 1;
            visibility: visible;
        }
        @media (max-width: 768px) {
            .hero-content h1 { font-size: 2.5rem; }
            .section-header h2 { font-size: 2.2rem; }
            .hero-section { padding: 7rem 0 5rem; }
        }