:root {
            --primary-color: #0056a6;
            --secondary-color: #e31837;
            --accent-color: #28a745;
            --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', 'Microsoft YaHei', Arial, sans-serif;
            color: var(--text-color);
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 600;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        a {
            color: var(--primary-color);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary-color);
        }
        .section-header {
            text-align: center;
            margin-bottom: 3.5rem;
            position: relative;
        }
        .section-header h2 {
            display: inline-block;
            font-size: 2.5rem;
            position: relative;
            padding-bottom: 15px;
        }
        .section-header h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
            border-radius: 2px;
        }
        .btn-primary-custom {
            background: linear-gradient(135deg, var(--primary-color), #0077cc);
            border: none;
            padding: 12px 28px;
            border-radius: var(--border-radius);
            color: white;
            font-weight: 500;
            transition: var(--transition);
            box-shadow: var(--box-shadow);
        }
        .btn-primary-custom:hover {
            background: linear-gradient(135deg, #004a8f, #0066b3);
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(0, 86, 166, 0.25);
        }
        .btn-secondary-custom {
            background: var(--secondary-color);
            border: none;
            padding: 10px 24px;
            border-radius: var(--border-radius);
            color: white;
            font-weight: 500;
            transition: var(--transition);
        }
        .btn-secondary-custom:hover {
            background: #c3142f;
            color: white;
            transform: translateY(-2px);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.98);
            box-shadow: 0 2px 15px 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-brand span {
            color: var(--secondary-color);
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            margin: 0 8px;
            color: var(--dark-color) !important;
            position: relative;
        }
        .navbar-nav .nav-link:hover {
            color: var(--primary-color) !important;
        }
        .navbar-nav .nav-link.active {
            color: var(--primary-color) !important;
            font-weight: 600;
        }
        .hero-section {
            background: linear-gradient(rgba(0, 50, 100, 0.85), rgba(0, 70, 130, 0.9)), url('https://images.unsplash.com/photo-1585435557343-3b092031c4c5?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') no-repeat center center;
            background-size: cover;
            color: white;
            padding: 180px 0 120px;
            position: relative;
        }
        .hero-section h1 {
            color: white;
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
        }
        .hero-section p {
            font-size: 1.25rem;
            margin-bottom: 2rem;
            opacity: 0.9;
        }
        .feature-card {
            background: white;
            border-radius: var(--border-radius);
            padding: 2.5rem 2rem;
            box-shadow: var(--box-shadow);
            height: 100%;
            transition: var(--transition);
            border-top: 4px solid transparent;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.12);
            border-top-color: var(--primary-color);
        }
        .feature-card i {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
        }
        .product-card {
            border: none;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            height: 100%;
        }
        .product-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }
        .product-card img {
            height: 220px;
            object-fit: cover;
            transition: var(--transition);
        }
        .product-card:hover img {
            transform: scale(1.05);
        }
        .product-card .card-body {
            padding: 1.75rem;
        }
        .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);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.12);
        }
        .news-date {
            position: absolute;
            top: 15px;
            left: 15px;
            background: var(--primary-color);
            color: white;
            padding: 8px 15px;
            border-radius: var(--border-radius);
            font-weight: 600;
            font-size: 0.9rem;
        }
        .news-card img {
            height: 200px;
            object-fit: cover;
        }
        .contact-info-box {
            background: white;
            border-radius: var(--border-radius);
            padding: 2rem;
            box-shadow: var(--box-shadow);
            height: 100%;
            text-align: center;
            transition: var(--transition);
        }
        .contact-info-box:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.12);
        }
        .contact-info-box i {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
        }
        footer {
            background: linear-gradient(to right, #1a3c6e, #0d2b4d);
            color: white;
            padding-top: 4rem;
            padding-bottom: 2rem;
        }
        footer a {
            color: rgba(255, 255, 255, 0.8);
        }
        footer a:hover {
            color: white;
        }
        .footer-links h5 {
            color: white;
            font-size: 1.25rem;
            margin-bottom: 1.5rem;
            padding-bottom: 0.75rem;
            position: relative;
        }
        .footer-links h5::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 3px;
            background: var(--accent-color);
        }
        .footer-links ul {
            padding-left: 0;
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.75rem;
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 1.5rem;
            margin-top: 3rem;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.7);
        }
        .friendlink {
            background: var(--light-color);
            padding: 3rem 0;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 12px 25px;
            margin: 8px;
            border-radius: 50px;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.06);
            transition: var(--transition);
            color: var(--dark-color);
            font-weight: 500;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 86, 166, 0.15);
        }
        .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: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--secondary-color);
            color: white;
        }
        .timeline {
            position: relative;
            max-width: 1200px;
            margin: 0 auto;
        }
        .timeline::after {
            content: '';
            position: absolute;
            width: 6px;
            background: linear-gradient(to bottom, var(--primary-color), var(--accent-color));
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -3px;
            border-radius: 3px;
        }
        .timeline-item {
            padding: 10px 40px;
            position: relative;
            width: 50%;
            box-sizing: border-box;
        }
        .timeline-item:nth-child(odd) {
            left: 0;
        }
        .timeline-item:nth-child(even) {
            left: 50%;
        }
        .timeline-content {
            padding: 20px;
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            position: relative;
        }
        .timeline-content h4 {
            margin-top: 0;
            color: var(--primary-color);
        }
        .timeline-item::after {
            content: '';
            position: absolute;
            width: 25px;
            height: 25px;
            background: var(--primary-color);
            border: 4px solid white;
            border-radius: 50%;
            top: 15px;
            z-index: 1;
        }
        .timeline-item:nth-child(odd)::after {
            right: -13px;
        }
        .timeline-item:nth-child(even)::after {
            left: -13px;
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .section-header h2 {
                font-size: 2rem;
            }
            .timeline::after {
                left: 31px;
            }
            .timeline-item {
                width: 100%;
                padding-left: 70px;
                padding-right: 25px;
            }
            .timeline-item:nth-child(even) {
                left: 0;
            }
            .timeline-item::after {
                left: 18px;
            }
            .timeline-item:nth-child(odd)::after {
                right: auto;
                left: 18px;
            }
        }
        .certificate-badge {
            display: inline-block;
            background: var(--accent-color);
            color: white;
            padding: 5px 15px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-right: 10px;
            margin-bottom: 10px;
        }
        .stats-box {
            text-align: center;
            padding: 2rem 1rem;
        }
        .stats-box .number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary-color);
            line-height: 1;
            margin-bottom: 0.5rem;
        }
        .stats-box .label {
            font-size: 1.1rem;
            color: var(--dark-color);
        }
        .modal-content {
            border-radius: var(--border-radius);
            border: none;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
        }
        .modal-header {
            background: linear-gradient(135deg, var(--primary-color), #0077cc);
            color: white;
            border-radius: var(--border-radius) var(--border-radius) 0 0;
            border: none;
        }
        .close-btn {
            color: white;
            opacity: 0.9;
        }
        .form-control, .form-select {
            padding: 12px 15px;
            border-radius: var(--border-radius);
            border: 1px solid #ddd;
            transition: var(--transition);
        }
        .form-control:focus, .form-select:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(0, 86, 166, 0.25);
        }