:root {
            --primary-color: #0056b3;
            --secondary-color: #17a2b8;
            --accent-color: #ff6b00;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
            --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: 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            color: var(--text-color);
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 600;
            margin-bottom: 1rem;
        }
        a {
            color: var(--primary-color);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent-color);
        }
        .section-padding {
            padding: 5rem 0;
        }
        .section-title {
            position: relative;
            margin-bottom: 3rem;
            padding-bottom: 1rem;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            border-radius: 2px;
        }
        .section-subtitle {
            color: #666;
            text-align: center;
            max-width: 700px;
            margin: 0 auto 3rem;
        }
        .btn-lexin {
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            border: none;
            color: white;
            padding: 0.75rem 2rem;
            border-radius: var(--border-radius);
            font-weight: 500;
            transition: var(--transition);
        }
        .btn-lexin:hover {
            color: white;
            transform: translateY(-3px);
            box-shadow: var(--box-shadow);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.98);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
            padding: 1rem 0;
            transition: var(--transition);
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            padding: 0.5rem 1.2rem;
            color: var(--dark-color);
        }
        .navbar-nav .nav-link:hover,
        .navbar-nav .nav-link.active {
            color: var(--primary-color);
        }
        .hero-section {
            background: linear-gradient(135deg, rgba(0, 86, 179, 0.9) 0%, rgba(23, 162, 184, 0.85) 100%), url('https://images.unsplash.com/photo-1551434678-e076c223a692?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 10rem 0 8rem;
            position: relative;
        }
        .hero-title {
            font-size: 3.2rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }
        .hero-subtitle {
            font-size: 1.3rem;
            margin-bottom: 2.5rem;
            opacity: 0.9;
        }
        .feature-box {
            background: white;
            border-radius: var(--border-radius);
            padding: 2.5rem 2rem;
            height: 100%;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            border-top: 4px solid var(--primary-color);
        }
        .feature-box:hover {
            transform: translateY(-10px);
        }
        .feature-icon {
            font-size: 2.8rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary-color);
            line-height: 1;
        }
        .stat-label {
            color: #666;
            font-weight: 500;
            text-transform: uppercase;
            font-size: 0.9rem;
            letter-spacing: 1px;
        }
        .card-service {
            border: none;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            height: 100%;
        }
        .card-service:hover {
            transform: translateY(-8px);
        }
        .card-service img {
            height: 220px;
            object-fit: cover;
            transition: var(--transition);
        }
        .card-service:hover img {
            transform: scale(1.05);
        }
        .card-service .card-body {
            padding: 1.8rem;
        }
        .timeline {
            position: relative;
            max-width: 900px;
            margin: 0 auto;
        }
        .timeline:before {
            content: '';
            position: absolute;
            left: 50%;
            top: 0;
            bottom: 0;
            width: 4px;
            background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
            transform: translateX(-50%);
        }
        .timeline-item {
            margin-bottom: 3rem;
            position: relative;
            width: 46%;
        }
        .timeline-item:nth-child(odd) {
            margin-left: 0;
            margin-right: auto;
            text-align: right;
            padding-right: 4rem;
        }
        .timeline-item:nth-child(even) {
            margin-left: auto;
            margin-right: 0;
            padding-left: 4rem;
        }
        .timeline-dot {
            position: absolute;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--primary-color);
            top: 20px;
        }
        .timeline-item:nth-child(odd) .timeline-dot {
            right: -12px;
        }
        .timeline-item:nth-child(even) .timeline-dot {
            left: -12px;
        }
        .team-member {
            text-align: center;
            margin-bottom: 2rem;
        }
        .team-member img {
            width: 180px;
            height: 180px;
            object-fit: cover;
            border-radius: 50%;
            margin-bottom: 1.5rem;
            border: 5px solid white;
            box-shadow: var(--box-shadow);
        }
        .news-card {
            border: none;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            height: 100%;
        }
        .news-card:hover {
            transform: translateY(-5px);
        }
        .news-date {
            background: var(--primary-color);
            color: white;
            padding: 0.5rem 1rem;
            position: absolute;
            top: 15px;
            left: 15px;
            border-radius: 4px;
            font-size: 0.9rem;
        }
        .contact-info-box {
            background: white;
            border-radius: var(--border-radius);
            padding: 2rem;
            margin-bottom: 1.5rem;
            box-shadow: var(--box-shadow);
            text-align: center;
            transition: var(--transition);
        }
        .contact-info-box:hover {
            transform: translateY(-5px);
        }
        .contact-icon {
            font-size: 2.2rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        footer {
            background-color: #1a1a2e;
            color: #aaa;
            padding: 4rem 0 0;
        }
        footer a {
            color: #ccc;
        }
        footer a:hover {
            color: white;
        }
        .footer-title {
            color: white;
            font-size: 1.2rem;
            margin-bottom: 1.5rem;
            padding-bottom: 0.5rem;
            position: relative;
        }
        .footer-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 3px;
            background: var(--primary-color);
        }
        .flink {
            display: inline-block;
            background: rgba(255, 255, 255, 0.05);
            color: #ccc;
            padding: 0.5rem 1rem;
            margin: 0 0.5rem 0.5rem 0;
            border-radius: 4px;
            transition: var(--transition);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        .flink:hover {
            background: rgba(255, 255, 255, 0.1);
            color: white;
            text-decoration: none;
            transform: translateY(-2px);
        }
        .copyright {
            background-color: #0f0f1a;
            padding: 1.5rem 0;
            margin-top: 4rem;
            text-align: center;
            color: #888;
            font-size: 0.9rem;
        }
        .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;
            z-index: 999;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
        }
        .back-to-top.show {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--accent-color);
            color: white;
            transform: translateY(-3px);
        }
        @media (max-width: 991.98px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .section-padding {
                padding: 4rem 0;
            }
            .timeline:before {
                left: 30px;
            }
            .timeline-item {
                width: 100%;
                padding-left: 70px !important;
                padding-right: 1rem !important;
                text-align: left !important;
            }
            .timeline-item:nth-child(odd) .timeline-dot,
            .timeline-item:nth-child(even) .timeline-dot {
                left: 20px;
                right: auto;
            }
        }
        @media (max-width: 767.98px) {
            .hero-title {
                font-size: 2rem;
            }
            .section-padding {
                padding: 3rem 0;
            }
            .stat-number {
                font-size: 2.2rem;
            }
        }