:root {
            --primary-color: #1a5f9e;
            --secondary-color: #0d3c6b;
            --accent-color: #28a745;
            --light-bg: #f8f9fa;
            --dark-text: #212529;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--dark-text);
            line-height: 1.6;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
        }
        .hero-section {
            background: linear-gradient(rgba(13, 60, 107, 0.85), rgba(13, 60, 107, 0.9)), url('https://images.unsplash.com/photo-1558618666-fcd25c85cd64?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 120px 0;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 40px;
            text-align: center;
            font-weight: 600;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--accent-color);
        }
        .product-card {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            transition: var(--transition);
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            height: 100%;
        }
        .product-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .product-card img {
            height: 220px;
            object-fit: cover;
            transition: var(--transition);
        }
        .product-card:hover img {
            transform: scale(1.05);
        }
        .flink {
            display: inline-block;
            padding: 8px 16px;
            margin: 5px;
            background-color: var(--light-bg);
            border-radius: 5px;
            color: var(--primary-color);
            text-decoration: none;
            transition: var(--transition);
            border: 1px solid #dee2e6;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        .contact-info i {
            width: 40px;
            height: 40px;
            line-height: 40px;
            text-align: center;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            margin-right: 15px;
        }
        footer {
            background-color: var(--secondary-color);
            color: rgba(255,255,255,0.85);
        }
        footer a {
            color: rgba(255,255,255,0.85);
            text-decoration: none;
            transition: var(--transition);
        }
        footer a:hover {
            color: white;
            padding-left: 5px;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 10px 25px;
            border-radius: 30px;
            font-weight: 500;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            transform: translateY(-3px);
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--primary-color);
            display: block;
        }
        .news-card {
            border-left: 4px solid var(--primary-color);
            padding-left: 20px;
            margin-bottom: 25px;
        }
        .sticky-nav {
            position: sticky;
            top: 0;
            z-index: 1020;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 80px 0;
                text-align: center;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }