:root {
            --primary-color: #1a365d;
            --secondary-color: #c53030;
            --accent-color: #2d3748;
            --light-bg: #f7fafc;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.6;
        }
        .hero-section {
            background: linear-gradient(rgba(26, 54, 93, 0.85), rgba(26, 54, 93, 0.9)), 
                        url('https://images.unsplash.com/photo-1504307651254-35680f356dfd?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 120px 0;
        }
        .navbar {
            box-shadow: 0 2px 15px rgba(0,0,0,0.1);
            transition: all 0.3s ease;
            background-color: rgba(255,255,255,0.95);
        }
        .navbar.scrolled {
            padding: 5px 0;
            background-color: white;
        }
        .nav-link {
            font-weight: 500;
            color: var(--primary-color) !important;
            margin: 0 10px;
            transition: color 0.3s;
        }
        .nav-link:hover {
            color: var(--secondary-color) !important;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 40px;
            color: var(--primary-color);
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 60px;
            height: 3px;
            background: var(--secondary-color);
        }
        .product-card {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            transition: transform 0.3s, box-shadow 0.3s;
            height: 100%;
        }
        .product-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .product-img {
            height: 250px;
            object-fit: cover;
        }
        .icon-box {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            background: var(--primary-color);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
        }
        .flink {
            display: inline-block;
            padding: 8px 20px;
            background: #f8f9fa;
            border-radius: 25px;
            margin: 5px;
            text-decoration: none;
            color: #495057;
            transition: all 0.3s;
            border: 1px solid #e9ecef;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-2px);
            text-decoration: none;
        }
        .contact-info-box {
            background: var(--light-bg);
            border-radius: 10px;
            padding: 30px;
            height: 100%;
            transition: transform 0.3s;
        }
        .contact-info-box:hover {
            transform: translateY(-5px);
        }
        footer {
            background: var(--primary-color);
            color: #e2e8f0;
        }
        footer a {
            color: #cbd5e0;
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .news-card {
            border-left: 4px solid var(--primary-color);
            transition: all 0.3s;
        }
        .news-card:hover {
            border-left-color: var(--secondary-color);
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 80px 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .contact-info-box {
                margin-bottom: 20px;
            }
        }