:root {
            --primary-color: #1a5f7a;
            --secondary-color: #2d9cdb;
            --accent-color: #f2c94c;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
            --success-color: #27ae60;
        }
        body {
            font-family: "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
            color: #333;
            line-height: 1.7;
        }
        .navbar-brand {
            font-weight: 700;
            color: var(--primary-color) !important;
        }
        .nav-link {
            font-weight: 500;
            transition: color 0.3s;
        }
        .nav-link:hover {
            color: var(--secondary-color) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(26, 95, 122, 0.85), rgba(45, 156, 219, 0.8)), url('https://images.unsplash.com/photo-1551836026-d5c2c5af78e4?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 120px 0;
        }
        .section-title {
            position: relative;
            padding-bottom: 20px;
            margin-bottom: 50px;
            text-align: center;
            color: var(--primary-color);
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--accent-color);
        }
        .service-card {
            border: none;
            border-radius: 12px;
            box-shadow: 0 8px 25px rgba(0,0,0,0.08);
            transition: transform 0.4s, box-shadow 0.4s;
            height: 100%;
            overflow: hidden;
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(0,0,0,0.12);
        }
        .service-icon {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 25px;
            color: white;
            font-size: 28px;
        }
        .advantage-item {
            padding: 25px;
            border-radius: 10px;
            background: #f8fafc;
            border-left: 5px solid var(--secondary-color);
            transition: background 0.3s;
        }
        .advantage-item:hover {
            background: #e3f2fd;
        }
        .process-step {
            text-align: center;
            position: relative;
            padding: 30px 20px;
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .step-number {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: var(--primary-color);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 22px;
            margin: 0 auto 20px;
        }
        .testimonial-card {
            background: white;
            border-radius: 12px;
            padding: 30px;
            box-shadow: 0 8px 25px rgba(0,0,0,0.06);
            border-top: 5px solid var(--secondary-color);
        }
        .client-avatar {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            object-fit: cover;
        }
        .footer {
            background: #2c3e50;
            color: #ecf0f1;
            padding-top: 60px;
        }
        .footer a {
            color: #bdc3c7;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer a:hover {
            color: white;
        }
        .social-icon {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255,255,255,0.1);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-right: 10px;
            transition: all 0.3s;
        }
        .social-icon:hover {
            background: var(--secondary-color);
            transform: translateY(-3px);
        }
        .flink {
            display: inline-block;
            padding: 8px 20px;
            margin: 5px 10px;
            background: #f1f8ff;
            border-radius: 6px;
            color: var(--primary-color);
            border: 1px solid #d1e6ff;
            transition: all 0.3s;
            text-decoration: none;
        }
        .flink:hover {
            background: var(--secondary-color);
            color: white;
            border-color: var(--secondary-color);
            transform: translateY(-2px);
        }
        .btn-primary-custom {
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            border: none;
            padding: 12px 30px;
            border-radius: 6px;
            color: white;
            font-weight: 500;
            transition: all 0.3s;
        }
        .btn-primary-custom:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(45, 156, 219, 0.3);
            color: white;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: var(--primary-color);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            cursor: pointer;
            z-index: 999;
            opacity: 0;
            transition: all 0.3s;
            box-shadow: 0 4px 15px rgba(0,0,0,0.1);
        }
        .back-to-top.active {
            opacity: 1;
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary-color);
            line-height: 1;
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2rem;
            }
            .stats-number {
                font-size: 2.5rem;
            }
        }