:root {
            --primary-color: #1a6dfc;
            --secondary-color: #0d47a1;
            --accent-color: #00c9a7;
            --dark-color: #1e293b;
            --light-color: #f8fafc;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.7;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
        }
        .nav-link {
            font-weight: 500;
            transition: all 0.3s;
        }
        .nav-link:hover {
            color: var(--primary-color) !important;
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(135deg, rgba(26, 111, 252, 0.9) 0%, rgba(13, 71, 161, 0.9) 100%), url('https://images.unsplash.com/photo-1451187580459-43490279c0fa?ixlib=rb-4.0.3&auto=format&fit=crop&w=2072&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 120px 0;
            margin-top: 80px;
        }
        .hero-section h1 {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.3);
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 50px;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--accent-color);
            border-radius: 2px;
        }
        .card-hover {
            transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            border: none;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            overflow: hidden;
        }
        .card-hover:hover {
            transform: translateY(-12px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .service-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 25px;
            font-size: 28px;
            color: white;
        }
        .feature-box {
            padding: 40px 30px;
            border-radius: 15px;
            background: white;
            height: 100%;
            transition: all 0.3s;
            border: 1px solid #eef2f7;
        }
        .feature-box:hover {
            border-color: var(--primary-color);
            box-shadow: 0 10px 30px rgba(26, 111, 252, 0.1);
        }
        .flink {
            display: inline-block;
            padding: 10px 20px;
            margin: 8px;
            background: #f8fafc;
            border-radius: 8px;
            color: #333;
            text-decoration: none;
            transition: all 0.3s;
            border: 1px solid #e2e8f0;
            font-weight: 500;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(26, 111, 252, 0.2);
            border-color: var(--primary-color);
        }
        .footer {
            background: var(--dark-color);
            color: white;
            padding: 70px 0 30px;
        }
        .footer-links a {
            color: #cbd5e1;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer-links a:hover {
            color: var(--accent-color);
        }
        .contact-info i {
            width: 40px;
            height: 40px;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
        }
        .btn-primary {
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            border: none;
            padding: 12px 30px;
            border-radius: 8px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(26, 111, 252, 0.3);
        }
        .timeline {
            position: relative;
            padding-left: 30px;
        }
        .timeline:before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 3px;
            background: var(--primary-color);
        }
        .timeline-item {
            position: relative;
            margin-bottom: 40px;
            padding-left: 30px;
        }
        .timeline-item:before {
            content: '';
            position: absolute;
            left: -38px;
            top: 5px;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background: var(--accent-color);
            border: 3px solid white;
            box-shadow: 0 0 0 3px var(--primary-color);
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-color);
            line-height: 1;
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 80px 0;
                margin-top: 60px;
            }
            .section-title {
                margin-bottom: 30px;
            }
        }
        .sticky-nav {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
            transition: all 0.3s;
        }
        .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;
            text-decoration: none;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--secondary-color);
            transform: translateY(-5px);
        }