:root {
            --primary-color: #0056b3;
            --secondary-color: #333333;
            --accent-color: #28a745;
            --light-bg: #f8f9fa;
            --dark-bg: #212529;
            --text-light: #ffffff;
            --text-dark: #333333;
            --border-radius: 8px;
            --box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            line-height: 1.6;
            color: var(--text-dark);
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--secondary-color);
            margin-bottom: 1rem;
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 800;
        }
        .navbar-brand span {
            color: var(--primary-color);
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            padding: 0.5rem 1rem;
            transition: var(--transition);
            border-radius: var(--border-radius);
        }
        .navbar-nav .nav-link:hover {
            background-color: rgba(0,86,179,0.1);
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1485827404703-89b55fcc595e?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2070&q=80') center/cover no-repeat;
            color: var(--text-light);
            padding: 120px 0;
            min-height: 85vh;
            display: flex;
            align-items: center;
        }
        .hero-section h1 {
            color: var(--text-light);
            font-size: 3.5rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
        }
        .hero-section .lead {
            font-size: 1.4rem;
            margin-bottom: 2rem;
        }
        .section-padding {
            padding: 80px 0;
        }
        .section-title {
            position: relative;
            margin-bottom: 3rem;
            padding-bottom: 1rem;
        }
        .section-title::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 80px;
            height: 4px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }
        .section-title.text-center::after {
            left: 50%;
            transform: translateX(-50%);
        }
        .card-hover {
            transition: var(--transition);
            border: none;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            height: 100%;
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .icon-box {
            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;
            transition: var(--transition);
        }
        .icon-box i {
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .card-hover:hover .icon-box {
            background-color: var(--primary-color);
        }
        .card-hover:hover .icon-box i {
            color: white;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.75rem 2rem;
            font-weight: 600;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: #004494;
            border-color: #004494;
            transform: translateY(-3px);
        }
        .about-img {
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
        }
        .about-img img {
            transition: var(--transition);
        }
        .about-img:hover img {
            transform: scale(1.05);
        }
        .stats-box {
            text-align: center;
            padding: 2rem;
            border-radius: var(--border-radius);
            background-color: var(--light-bg);
            box-shadow: var(--box-shadow);
            transition: var(--transition);
        }
        .stats-box:hover {
            background-color: var(--primary-color);
            color: white;
        }
        .stats-box:hover h3, .stats-box:hover p {
            color: white;
        }
        .stats-box h3 {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }
        .product-card {
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            height: 100%;
            position: relative;
        }
        .product-img {
            height: 250px;
            overflow: hidden;
        }
        .product-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .product-card:hover .product-img img {
            transform: scale(1.1);
        }
        .product-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(to bottom, transparent 50%, rgba(0,0,0,0.8));
            display: flex;
            align-items: flex-end;
            padding: 1.5rem;
            opacity: 0;
            transition: var(--transition);
        }
        .product-card:hover .product-overlay {
            opacity: 1;
        }
        .contact-info-box {
            background-color: var(--light-bg);
            border-radius: var(--border-radius);
            padding: 2rem;
            margin-bottom: 1.5rem;
            transition: var(--transition);
        }
        .contact-info-box:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-5px);
        }
        .contact-info-box:hover h5, .contact-info-box:hover p, .contact-info-box:hover i {
            color: white;
        }
        .contact-info-box i {
            font-size: 2rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .form-control, .form-select {
            border-radius: var(--border-radius);
            padding: 0.75rem;
            border: 1px solid #dee2e6;
            transition: var(--transition);
        }
        .form-control:focus, .form-select:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(0,86,179,0.25);
        }
        .footer {
            background-color: var(--dark-bg);
            color: #adb5bd;
            padding: 60px 0 30px;
        }
        .footer h5 {
            color: var(--text-light);
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 0.75rem;
        }
        .footer h5::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 40px;
            height: 3px;
            background-color: var(--primary-color);
        }
        .footer-links a {
            color: #adb5bd;
            text-decoration: none;
            transition: var(--transition);
            display: block;
            margin-bottom: 0.5rem;
        }
        .footer-links a:hover {
            color: var(--primary-color);
            padding-left: 8px;
        }
        .copyright {
            border-top: 1px solid #495057;
            padding-top: 30px;
            margin-top: 50px;
            text-align: center;
        }
        .friendlink {
            background-color: var(--light-bg);
            padding: 60px 0;
        }
        .flink {
            background-color: white;
            border-radius: var(--border-radius);
            padding: 1.5rem;
            display: flex;
            align-items: center;
            justify-content: center;
            height: 100px;
            transition: var(--transition);
            box-shadow: var(--box-shadow);
            text-decoration: none;
            color: var(--text-dark);
            font-weight: 600;
        }
        .flink:hover {
            transform: translateY(-8px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
            color: var(--primary-color);
        }
        .flink img {
            max-height: 40px;
            max-width: 100%;
            margin-right: 10px;
        }
        .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;
            text-decoration: none;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: #004494;
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 80px 0;
                min-height: 70vh;
            }
            .section-padding {
                padding: 60px 0;
            }
        }