:root {
            --primary-color: #0d6efd;
            --secondary-color: #198754;
            --accent-color: #6c757d;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --border-radius: 8px;
            --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.6;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 600;
            color: var(--dark-color);
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.5rem;
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            padding: 0.5rem 1rem;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
            background-color: rgba(13, 110, 253, 0.1);
            color: var(--primary-color);
        }
        .hero-section {
            background: linear-gradient(135deg, rgba(13, 110, 253, 0.85) 0%, rgba(25, 135, 84, 0.85) 100%), url('https://images.unsplash.com/photo-1582719508461-905c673771fd?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
            color: white;
            padding: 120px 0 100px;
            margin-top: 76px;
        }
        .hero-section h1 {
            font-size: 3rem;
            font-weight: 700;
            color: white;
            margin-bottom: 1.5rem;
        }
        .section-padding {
            padding: 80px 0;
        }
        .section-title {
            position: relative;
            margin-bottom: 3rem;
            padding-bottom: 1rem;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--primary-color);
            border-radius: 2px;
        }
        .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 12px 24px rgba(0, 0, 0, 0.15);
        }
        .card-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, var(--primary-color), #0a58ca);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: white;
            font-size: 1.8rem;
        }
        .btn-primary {
            background: linear-gradient(to right, var(--primary-color), #0a58ca);
            border: none;
            border-radius: 50px;
            padding: 0.75rem 2rem;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background: linear-gradient(to right, #0a58ca, var(--primary-color));
            transform: translateY(-3px);
            box-shadow: 0 8px 15px rgba(13, 110, 253, 0.3);
        }
        .product-card .card-img-top {
            height: 220px;
            object-fit: cover;
            border-top-left-radius: var(--border-radius);
            border-top-right-radius: var(--border-radius);
        }
        .news-card .card-img-top {
            height: 200px;
            object-fit: cover;
        }
        .testimonial-card {
            border-left: 4px solid var(--primary-color);
        }
        .contact-info-box {
            background: var(--light-color);
            border-radius: var(--border-radius);
            padding: 2rem;
            height: 100%;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
        }
        .contact-info-box:hover {
            background: white;
            transform: translateY(-5px);
        }
        .contact-info-box i {
            font-size: 2rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        footer {
            background: var(--dark-color);
            color: #ddd;
        }
        footer a {
            color: #ddd;
            text-decoration: none;
            transition: var(--transition);
        }
        footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .footer-links h5 {
            color: white;
            border-bottom: 2px solid var(--primary-color);
            padding-bottom: 0.5rem;
            margin-bottom: 1.5rem;
        }
        .friendlink {
            background: #f8f9fa;
            padding: 40px 0;
            border-top: 1px solid #dee2e6;
            border-bottom: 1px solid #dee2e6;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 12px 24px;
            margin: 5px 10px;
            border-radius: 50px;
            color: #333;
            font-weight: 500;
            text-decoration: none;
            box-shadow: 0 3px 8px rgba(0,0,0,0.1);
            transition: var(--transition);
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            text-decoration: none;
        }
        .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;
            z-index: 1000;
            opacity: 0;
            transition: var(--transition);
        }
        .back-to-top.visible {
            opacity: 1;
        }
        .back-to-top:hover {
            background: #0a58ca;
            color: white;
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.2rem;
            }
            .section-padding {
                padding: 60px 0;
            }
            .hero-section {
                padding: 80px 0 60px;
            }
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }
        .timeline-item {
            position: relative;
            padding-left: 2rem;
            margin-bottom: 2rem;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            width: 12px;
            height: 12px;
            background: var(--primary-color);
            border-radius: 50%;
        }
        .timeline-item::after {
            content: '';
            position: absolute;
            left: 5px;
            top: 12px;
            width: 2px;
            height: calc(100% + 2rem);
            background: var(--primary-color);
        }
        .timeline-item:last-child::after {
            display: none;
        }