:root {
            --primary-color: #0056b3;
            --secondary-color: #28a745;
            --accent-color: #ff6b35;
            --dark-color: #1a365d;
            --light-color: #f8f9fa;
            --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: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--text-color);
            line-height: 1.6;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.5rem;
            color: var(--primary-color);
        }
        .navbar-brand span {
            color: var(--accent-color);
        }
        .hero-section {
            background: linear-gradient(rgba(0, 86, 179, 0.9), rgba(40, 167, 69, 0.8)), url('https://images.unsplash.com/photo-1552664730-d307ca884978?ixlib=rb-4.0.3&auto=format&fit=crop&w=1200&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 120px 0 80px;
            margin-top: 76px;
        }
        .hero-section h1 {
            font-size: 2.8rem;
            font-weight: 700;
            margin-bottom: 20px;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 40px;
            color: var(--dark-color);
            font-weight: 700;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 60px;
            height: 3px;
            background: var(--accent-color);
        }
        .section-title.text-center:after {
            left: 50%;
            transform: translateX(-50%);
        }
        .card {
            border: none;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }
        .service-icon {
            width: 70px;
            height: 70px;
            background: var(--primary-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            color: white;
            font-size: 1.8rem;
        }
        .stat-card {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 30px 20px;
            border-radius: var(--border-radius);
            text-align: center;
            box-shadow: var(--box-shadow);
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .client-logo {
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 15px;
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            transition: var(--transition);
        }
        .client-logo:hover {
            transform: scale(1.05);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 10px 25px;
            border-radius: 30px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: #004494;
            border-color: #004494;
            transform: translateY(-3px);
        }
        .btn-accent {
            background-color: var(--accent-color);
            border-color: var(--accent-color);
            color: white;
            padding: 10px 25px;
            border-radius: 30px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-accent:hover {
            background-color: #e05a2c;
            border-color: #e05a2c;
            color: white;
            transform: translateY(-3px);
        }
        .contact-info {
            background: var(--light-color);
            padding: 30px;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
        }
        .contact-icon {
            width: 50px;
            height: 50px;
            background: var(--primary-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.2rem;
            margin-right: 15px;
        }
        .footer {
            background: var(--dark-color);
            color: white;
            padding: 60px 0 30px;
        }
        .footer a {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
            transition: var(--transition);
        }
        .footer a:hover {
            color: white;
            padding-left: 5px;
        }
        .friendlink-section {
            background: #f1f5f9;
            padding: 40px 0;
        }
        .flink {
            display: inline-block;
            padding: 8px 20px;
            margin: 5px 10px;
            background: white;
            border-radius: 30px;
            color: var(--dark-color);
            text-decoration: none;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
            transition: var(--transition);
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        .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;
            font-size: 1.2rem;
            text-decoration: none;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--accent-color);
            color: white;
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2rem;
            }
            .hero-section {
                padding: 80px 0 50px;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .stat-number {
                font-size: 2rem;
            }
        }