:root {
            --primary-blue: #0d6efd;
            --secondary-blue: #0a58ca;
            --accent-orange: #fd7e14;
            --dark-bg: #212529;
            --light-bg: #f8f9fa;
            --text-dark: #343a40;
            --text-light: #6c757d;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--text-dark);
            overflow-x: hidden;
        }
        .gradient-header {
            background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
        }
        .navbar {
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            transition: all 0.3s ease;
            padding-top: 0.75rem;
            padding-bottom: 0.75rem;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            background: linear-gradient(90deg, #fff 0%, #e3f2fd 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .nav-link {
            font-weight: 500;
            margin: 0 0.5rem;
            border-bottom: 2px solid transparent;
            transition: all 0.3s;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--accent-orange) !important;
            border-bottom-color: var(--accent-orange);
        }
        .hero-section {
            padding: 8rem 0 6rem;
            background: linear-gradient(rgba(13, 110, 253, 0.9), rgba(10, 88, 202, 0.9)), url('https://images.unsplash.com/photo-1551288049-bebda4e38f71?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') center/cover no-repeat;
            color: white;
            position: relative;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }
        .hero-subtitle {
            font-size: 1.3rem;
            max-width: 700px;
            margin: 0 auto 2.5rem;
            opacity: 0.95;
        }
        .btn-primary-custom {
            background: var(--accent-orange);
            border: none;
            padding: 0.8rem 2.2rem;
            font-weight: 600;
            border-radius: 50px;
            transition: all 0.3s;
            color: white;
        }
        .btn-primary-custom:hover {
            background: #e96b00;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(253, 126, 20, 0.3);
        }
        .section-title {
            font-weight: 700;
            color: var(--dark-bg);
            position: relative;
            padding-bottom: 1rem;
            margin-bottom: 3rem;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--accent-orange);
            border-radius: 2px;
        }
        .service-card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            transition: all 0.4s ease;
            height: 100%;
            background: white;
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(13, 110, 253, 0.15);
        }
        .service-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: -40px auto 1.5rem;
            color: white;
            font-size: 2rem;
            box-shadow: 0 8px 20px rgba(13, 110, 253, 0.3);
        }
        .case-study-img {
            height: 240px;
            object-fit: cover;
            border-radius: 10px 10px 0 0;
        }
        .stats-section {
            background: linear-gradient(rgba(33, 37, 41, 0.95), rgba(33, 37, 41, 0.95)), url('https://images.unsplash.com/photo-1516321318423-f06f85e504b3?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') center/cover fixed;
            padding: 5rem 0;
            color: white;
        }
        .stat-number {
            font-size: 3.5rem;
            font-weight: 800;
            color: var(--accent-orange);
            line-height: 1;
        }
        .team-member {
            text-align: center;
            margin-bottom: 2rem;
        }
        .team-img {
            width: 180px;
            height: 180px;
            object-fit: cover;
            border-radius: 50%;
            border: 5px solid white;
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
            margin-bottom: 1.2rem;
            transition: all 0.3s;
        }
        .team-member:hover .team-img {
            transform: scale(1.05);
        }
        .contact-info-box {
            background: var(--light-bg);
            border-radius: 15px;
            padding: 2rem;
            height: 100%;
            border-left: 5px solid var(--primary-blue);
            transition: all 0.3s;
        }
        .contact-info-box:hover {
            background: white;
            box-shadow: 0 10px 25px rgba(0,0,0,0.08);
        }
        .friendlink {
            background: var(--light-bg);
            padding: 4rem 0;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 0.8rem 1.8rem;
            margin: 0.5rem;
            border-radius: 50px;
            color: var(--text-dark);
            text-decoration: none;
            font-weight: 500;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            border: 1px solid #e9ecef;
            transition: all 0.3s;
        }
        .flink:hover {
            background: var(--primary-blue);
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(13, 110, 253, 0.3);
        }
        footer {
            background: var(--dark-bg);
            color: #adb5bd;
            padding-top: 4rem;
        }
        .footer-link {
            color: #ced4da;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer-link:hover {
            color: white;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-blue);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            text-decoration: none;
            box-shadow: 0 5px 15px rgba(13, 110, 253, 0.4);
            z-index: 100;
            opacity: 0;
            transition: all 0.3s;
        }
        .back-to-top.show {
            opacity: 1;
        }
        .back-to-top:hover {
            background: var(--secondary-blue);
            color: white;
        }
        .news-card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 8px 20px rgba(0,0,0,0.06);
            transition: all 0.3s;
            height: 100%;
        }
        .news-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .news-date {
            position: absolute;
            top: 15px;
            left: 15px;
            background: var(--primary-blue);
            color: white;
            padding: 0.3rem 0.8rem;
            border-radius: 20px;
            font-size: 0.85rem;
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .stat-number {
                font-size: 2.5rem;
            }
        }