:root {
            --primary-color: #0056b3;
            --secondary-color: #ff6600;
            --accent-color: #28a745;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
            --text-color: #333;
            --border-radius: 8px;
            --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Noto Sans SC', 'Roboto', sans-serif;
            color: var(--text-color);
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--dark-color);
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 2.5rem;
            text-align: center;
            font-size: 2.2rem;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--primary-color);
            border-radius: 2px;
        }
        .section-subtitle {
            text-align: center;
            color: #666;
            margin-bottom: 3rem;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }
        .btn-primary-custom {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            color: white;
            padding: 12px 28px;
            border-radius: var(--border-radius);
            font-weight: 500;
            transition: var(--transition);
        }
        .btn-primary-custom:hover {
            background-color: #004494;
            border-color: #004494;
            transform: translateY(-3px);
            box-shadow: var(--box-shadow);
        }
        .btn-secondary-custom {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            color: white;
            padding: 12px 28px;
            border-radius: var(--border-radius);
            font-weight: 500;
            transition: var(--transition);
        }
        .btn-secondary-custom:hover {
            background-color: #e55c00;
            border-color: #e55c00;
            transform: translateY(-3px);
            box-shadow: var(--box-shadow);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            padding: 15px 0;
            transition: var(--transition);
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .nav-link {
            font-weight: 500;
            margin: 0 10px;
            color: var(--dark-color) !important;
            transition: var(--transition);
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color) !important;
        }
        .navbar-toggler {
            border: none;
            padding: 0;
        }
        .navbar-toggler:focus {
            box-shadow: none;
        }
        .hero-section {
            background: linear-gradient(rgba(0, 86, 179, 0.85), rgba(0, 86, 179, 0.9)), url('https://images.unsplash.com/photo-1450101499163-c8848c66ca85?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            color: white;
            padding: 150px 0 100px;
            min-height: 100vh;
            display: flex;
            align-items: center;
        }
        .hero-content h1 {
            font-size: 3.5rem;
            color: white;
            margin-bottom: 1.5rem;
            text-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
        }
        .hero-content p {
            font-size: 1.3rem;
            margin-bottom: 2rem;
            max-width: 700px;
        }
        .hero-btns .btn {
            margin-right: 15px;
            margin-bottom: 15px;
        }
        .feature-card {
            background: white;
            border-radius: var(--border-radius);
            padding: 30px;
            height: 100%;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            border-top: 4px solid var(--primary-color);
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        .feature-icon {
            width: 70px;
            height: 70px;
            background: rgba(0, 86, 179, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 25px;
        }
        .feature-icon i {
            font-size: 30px;
            color: var(--primary-color);
        }
        .about-section {
            padding: 100px 0;
            background-color: var(--light-color);
        }
        .about-img {
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
        }
        .about-img img {
            width: 100%;
            height: auto;
            transition: var(--transition);
        }
        .about-img:hover img {
            transform: scale(1.05);
        }
        .about-content h2 {
            margin-bottom: 1.5rem;
        }
        .about-content p {
            margin-bottom: 1.5rem;
        }
        .about-stats {
            margin-top: 2rem;
        }
        .stat-item {
            text-align: center;
            padding: 20px 15px;
            background: white;
            border-radius: var(--border-radius);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 5px;
        }
        .stat-text {
            font-size: 1rem;
            color: #666;
        }
        .services-section {
            padding: 100px 0;
        }
        .service-card {
            background: white;
            border-radius: var(--border-radius);
            overflow: hidden;
            height: 100%;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
        }
        .service-card:hover {
            transform: translateY(-10px);
        }
        .service-img {
            height: 220px;
            overflow: hidden;
        }
        .service-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .service-card:hover .service-img img {
            transform: scale(1.1);
        }
        .service-content {
            padding: 25px;
        }
        .service-content h3 {
            font-size: 1.5rem;
            margin-bottom: 15px;
        }
        .products-section {
            padding: 100px 0;
            background-color: var(--light-color);
        }
        .product-card {
            background: white;
            border-radius: var(--border-radius);
            overflow: hidden;
            height: 100%;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
        }
        .product-card:hover {
            transform: translateY(-10px);
        }
        .product-img {
            height: 250px;
            overflow: hidden;
            position: relative;
        }
        .product-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .product-card:hover .product-img img {
            transform: scale(1.05);
        }
        .product-badge {
            position: absolute;
            top: 15px;
            right: 15px;
            background: var(--secondary-color);
            color: white;
            padding: 5px 12px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 500;
        }
        .product-content {
            padding: 25px;
        }
        .product-content h3 {
            font-size: 1.5rem;
            margin-bottom: 10px;
        }
        .product-price {
            color: var(--primary-color);
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 15px;
        }
        .case-section {
            padding: 100px 0;
        }
        .case-card {
            background: white;
            border-radius: var(--border-radius);
            overflow: hidden;
            height: 100%;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
        }
        .case-card:hover {
            transform: translateY(-10px);
        }
        .case-img {
            height: 250px;
            overflow: hidden;
        }
        .case-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .case-card:hover .case-img img {
            transform: scale(1.05);
        }
        .case-content {
            padding: 25px;
        }
        .case-content h3 {
            font-size: 1.5rem;
            margin-bottom: 10px;
        }
        .case-tag {
            display: inline-block;
            background: rgba(0, 86, 179, 0.1);
            color: var(--primary-color);
            padding: 5px 12px;
            border-radius: 20px;
            font-size: 0.85rem;
            margin-bottom: 15px;
        }
        .news-section {
            padding: 100px 0;
            background-color: var(--light-color);
        }
        .news-card {
            background: white;
            border-radius: var(--border-radius);
            overflow: hidden;
            height: 100%;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
        }
        .news-card:hover {
            transform: translateY(-10px);
        }
        .news-img {
            height: 220px;
            overflow: hidden;
        }
        .news-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .news-card:hover .news-img img {
            transform: scale(1.05);
        }
        .news-content {
            padding: 25px;
        }
        .news-meta {
            display: flex;
            justify-content: space-between;
            margin-bottom: 15px;
            color: #666;
            font-size: 0.9rem;
        }
        .news-content h3 {
            font-size: 1.3rem;
            margin-bottom: 15px;
        }
        .contact-section {
            padding: 100px 0;
        }
        .contact-info {
            background: var(--primary-color);
            color: white;
            padding: 40px;
            border-radius: var(--border-radius);
            height: 100%;
        }
        .contact-info h3 {
            color: white;
            margin-bottom: 25px;
        }
        .contact-item {
            display: flex;
            align-items: flex-start;
            margin-bottom: 25px;
        }
        .contact-icon {
            width: 50px;
            height: 50px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
            flex-shrink: 0;
        }
        .contact-icon i {
            font-size: 20px;
        }
        .contact-details h4 {
            color: white;
            font-size: 1.1rem;
            margin-bottom: 5px;
        }
        .contact-form {
            background: white;
            padding: 40px;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
        }
        .form-control {
            padding: 12px 15px;
            border-radius: var(--border-radius);
            border: 1px solid #ddd;
            margin-bottom: 20px;
            transition: var(--transition);
        }
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(0, 86, 179, 0.25);
        }
        .friendlink {
            padding: 80px 0;
            background-color: var(--light-color);
        }
        .flink-container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 20px;
            margin-top: 30px;
        }
        .flink {
            display: flex;
            align-items: center;
            justify-content: center;
            background: white;
            padding: 15px;
            border-radius: var(--border-radius);
            text-decoration: none;
            color: var(--dark-color);
            font-weight: 500;
            transition: var(--transition);
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
            border: 1px solid #eee;
        }
        .flink:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
            color: var(--primary-color);
            border-color: var(--primary-color);
        }
        .flink i {
            margin-right: 10px;
            font-size: 1.2rem;
        }
        .footer {
            background-color: var(--dark-color);
            color: #aaa;
            padding: 70px 0 20px;
        }
        .footer h4 {
            color: white;
            margin-bottom: 25px;
            font-size: 1.3rem;
        }
        .footer-links {
            list-style: none;
            padding: 0;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: #aaa;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .footer-contact p {
            margin-bottom: 15px;
            display: flex;
            align-items: flex-start;
        }
        .footer-contact i {
            margin-right: 10px;
            color: var(--secondary-color);
            margin-top: 5px;
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            margin-top: 50px;
            border-top: 1px solid #444;
            color: #888;
            font-size: 0.9rem;
        }
        .social-icons {
            display: flex;
            margin-top: 20px;
        }
        .social-icons a {
            width: 40px;
            height: 40px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 10px;
            color: white;
            transition: var(--transition);
        }
        .social-icons a:hover {
            background: var(--primary-color);
            transform: translateY(-5px);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            text-decoration: none;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--secondary-color);
            transform: translateY(-5px);
        }
        @media (max-width: 992px) {
            .hero-content h1 {
                font-size: 2.8rem;
            }
            .section-title {
                font-size: 2rem;
            }
            .hero-section {
                padding: 120px 0 80px;
            }
        }
        @media (max-width: 768px) {
            .hero-content h1 {
                font-size: 2.3rem;
            }
            .hero-content p {
                font-size: 1.1rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .about-section, .services-section, .products-section, .case-section, .news-section, .contact-section {
                padding: 70px 0;
            }
            .contact-info {
                margin-bottom: 30px;
            }
            .flink-container {
                grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
            }
        }
        @media (max-width: 576px) {
            .hero-content h1 {
                font-size: 2rem;
            }
            .navbar-brand {
                font-size: 1.5rem;
            }
            .hero-btns .btn {
                display: block;
                width: 100%;
                margin-right: 0;
            }
            .feature-card, .service-card, .product-card, .case-card, .news-card {
                margin-bottom: 30px;
            }
        }