:root {
            --primary-color: #0066cc;
            --secondary-color: #004d99;
            --accent-color: #00a86b;
            --light-bg: #f8f9fa;
            --dark-text: #333;
            --transition: all 0.3s ease;
        }
        body {
            font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
            color: var(--dark-text);
            line-height: 1.6;
        }
        header {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
        }
        .nav-link {
            font-weight: 500;
            transition: var(--transition);
        }
        .nav-link:hover {
            color: var(--accent-color) !important;
        }
        .hero {
            background: url('https://images.unsplash.com/photo-1516549655669-df6654e435de?ixlib=rb-4.0.3&auto=format&fit=crop&w=1950&q=80') center/cover no-repeat;
            min-height: 85vh;
            display: flex;
            align-items: center;
            color: white;
            position: relative;
        }
        .hero-overlay {
            background: rgba(0, 0, 0, 0.6);
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
        }
        .hero-content {
            position: relative;
            z-index: 2;
        }
        .section-title {
            color: var(--primary-color);
            border-left: 5px solid var(--accent-color);
            padding-left: 15px;
            margin-bottom: 2rem;
        }
        .card {
            border: none;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            transition: var(--transition);
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .service-icon {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .product-img {
            height: 250px;
            object-fit: cover;
            width: 100%;
        }
        .news-card img {
            height: 200px;
            object-fit: cover;
        }
        .contact-info i {
            color: var(--primary-color);
            margin-right: 10px;
        }
        .friendlink .flink {
            display: inline-block;
            background: var(--light-bg);
            padding: 10px 20px;
            margin: 5px;
            border-radius: 5px;
            color: var(--dark-text);
            text-decoration: none;
            transition: var(--transition);
        }
        .friendlink .flink:hover {
            background: var(--primary-color);
            color: white;
        }
        footer {
            background: #222;
            color: #ddd;
        }
        .footer-links a {
            color: #bbb;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: white;
        }
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(0,102,204,0.25);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
        }
        @media (max-width: 768px) {
            .hero {
                min-height: 60vh;
            }
            .navbar-nav {
                text-align: center;
            }
        }