:root {
            --primary-color: #0056b3;
            --secondary-color: #6c757d;
            --accent-color: #ff6b00;
            --light-bg: #f8f9fa;
            --dark-text: #212529;
            --transition-speed: 0.3s;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            color: var(--dark-text);
            line-height: 1.8;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.5rem;
        }
        .hero-section {
            background: linear-gradient(135deg, rgba(0, 86, 179, 0.9) 0%, rgba(0, 30, 80, 0.95) 100%), url('https://images.unsplash.com/photo-1558494949-ef010cbdcc31?ixlib=rb-4.0.3&auto=format&fit=crop&w=1350&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 8rem 0;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 2.5rem;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 60px;
            height: 3px;
            background-color: var(--accent-color);
        }
        .feature-icon {
            width: 70px;
            height: 70px;
            background-color: rgba(0, 86, 179, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
            color: var(--primary-color);
            font-size: 1.8rem;
            transition: all var(--transition-speed);
        }
        .feature-card:hover .feature-icon {
            background-color: var(--primary-color);
            color: white;
            transform: scale(1.1);
        }
        .product-card {
            border: 1px solid #eaeaea;
            border-radius: 10px;
            overflow: hidden;
            transition: all var(--transition-speed);
            height: 100%;
        }
        .product-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
            border-color: var(--primary-color);
        }
        .product-img {
            height: 200px;
            object-fit: cover;
            width: 100%;
        }
        .news-card {
            border-left: 4px solid var(--primary-color);
            padding-left: 1.5rem;
            margin-bottom: 2rem;
            transition: all var(--transition-speed);
        }
        .news-card:hover {
            border-left-color: var(--accent-color);
            padding-left: 2rem;
        }
        .contact-info-box {
            background-color: var(--light-bg);
            border-radius: 10px;
            padding: 2rem;
            height: 100%;
            transition: all var(--transition-speed);
        }
        .contact-info-box:hover {
            background-color: white;
            box-shadow: 0 10px 25px rgba(0,0,0,0.08);
        }
        .contact-info-box i {
            color: var(--primary-color);
            font-size: 1.5rem;
            margin-bottom: 1rem;
        }
        footer {
            background-color: #1a1a1a;
            color: #aaa;
        }
        .footer-links a {
            color: #ccc;
            text-decoration: none;
            transition: color var(--transition-speed);
        }
        .footer-links a:hover {
            color: white;
            text-decoration: underline;
        }
        .friendlink {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            justify-content: center;
            padding: 2rem 0;
            border-top: 1px solid #333;
            border-bottom: 1px solid #333;
        }
        .flink {
            background-color: #2a2a2a;
            color: #ddd;
            padding: 0.5rem 1.5rem;
            border-radius: 30px;
            text-decoration: none;
            transition: all var(--transition-speed);
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.6rem 1.8rem;
            border-radius: 30px;
        }
        .btn-primary:hover {
            background-color: #004494;
            border-color: #004494;
            transform: translateY(-2px);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            text-decoration: none;
            opacity: 0;
            transition: all var(--transition-speed);
            z-index: 1000;
        }
        .back-to-top.visible {
            opacity: 1;
        }
        .back-to-top:hover {
            background-color: var(--accent-color);
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 5rem 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }