:root {
            --primary-blue: #0056b3;
            --secondary-blue: #007bff;
            --industrial-orange: #ff6b35;
            --dark-gray: #333333;
            --medium-gray: #666666;
            --light-gray: #f8f9fa;
            --border-color: #dee2e6;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Noto Sans SC', 'Roboto', sans-serif;
            color: var(--dark-gray);
            line-height: 1.6;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--primary-blue);
        }
        h1 {
            font-size: 2.5rem;
        }
        h2 {
            font-size: 2rem;
            border-left: 5px solid var(--industrial-orange);
            padding-left: 15px;
            margin-bottom: 2rem;
        }
        h3 {
            font-size: 1.5rem;
        }
        p {
            margin-bottom: 1.2rem;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.5rem;
            color: var(--primary-blue);
        }
        .navbar-brand span {
            color: var(--industrial-orange);
        }
        .nav-link {
            font-weight: 500;
            padding: 0.5rem 1rem;
            transition: all 0.3s;
        }
        .nav-link:hover {
            color: var(--secondary-blue);
            transform: translateY(-2px);
        }
        .navbar-nav .nav-link.active {
            color: var(--secondary-blue);
            border-bottom: 2px solid var(--industrial-orange);
        }
        .hero-section {
            background: linear-gradient(rgba(0, 30, 60, 0.85), rgba(0, 30, 60, 0.9)), url('https://images.unsplash.com/photo-1581094794329-c8112a89af12?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2070&q=80');
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            color: white;
            padding: 120px 0;
            min-height: 100vh;
            display: flex;
            align-items: center;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
        }
        .hero-subtitle {
            font-size: 1.3rem;
            margin-bottom: 2rem;
            opacity: 0.9;
        }
        .btn-primary {
            background-color: var(--industrial-orange);
            border-color: var(--industrial-orange);
            padding: 12px 30px;
            font-weight: 600;
            border-radius: 4px;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: #e55a2b;
            border-color: #e55a2b;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        .card {
            border: none;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            transition: all 0.3s;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .card-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-blue);
            font-size: 1.8rem;
        }
        .about-section {
            padding: 100px 0;
            background-color: var(--light-gray);
        }
        .about-img {
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        }
        .about-img img {
            width: 100%;
            height: auto;
            transition: transform 0.5s;
        }
        .about-img:hover img {
            transform: scale(1.03);
        }
        .products-section {
            padding: 100px 0;
        }
        .product-category {
            background-color: white;
            border-radius: 8px;
            padding: 2rem;
            margin-bottom: 2rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: all 0.3s;
        }
        .product-category:hover {
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        .news-section {
            padding: 100px 0;
            background-color: var(--light-gray);
        }
        .news-item {
            margin-bottom: 2rem;
            padding-bottom: 2rem;
            border-bottom: 1px solid var(--border-color);
        }
        .news-date {
            color: var(--industrial-orange);
            font-weight: 600;
            font-size: 0.9rem;
            margin-bottom: 0.5rem;
        }
        .contact-section {
            padding: 100px 0;
            background: linear-gradient(rgba(0, 30, 60, 0.9), rgba(0, 30, 60, 0.9)), url('https://images.unsplash.com/photo-1552664730-d307ca884978?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2070&q=80');
            background-size: cover;
            background-position: center;
            color: white;
        }
        .contact-info {
            background-color: rgba(255, 255, 255, 0.1);
            padding: 2rem;
            border-radius: 8px;
            backdrop-filter: blur(10px);
            margin-bottom: 2rem;
        }
        .contact-icon {
            width: 50px;
            height: 50px;
            background-color: rgba(255, 107, 53, 0.2);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1rem;
            color: var(--industrial-orange);
            font-size: 1.3rem;
        }
        .friendlink {
            padding: 80px 0;
            background-color: var(--light-gray);
        }
        .flink {
            display: inline-block;
            padding: 10px 20px;
            margin: 0 10px 15px 0;
            background-color: white;
            border-radius: 4px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.05);
            transition: all 0.3s;
            color: var(--dark-gray);
            text-decoration: none;
            font-weight: 500;
        }
        .flink:hover {
            background-color: var(--primary-blue);
            color: white;
            transform: translateY(-3px);
            text-decoration: none;
        }
        .footer {
            background-color: #1a1a1a;
            color: #aaa;
            padding: 70px 0 20px;
        }
        .footer h5 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #aaa;
            text-decoration: none;
            transition: all 0.3s;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .copyright {
            border-top: 1px solid #333;
            padding-top: 20px;
            margin-top: 40px;
            text-align: center;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            .hero-title {
                font-size: 2.8rem;
            }
            .hero-section {
                padding: 100px 0;
                min-height: auto;
            }
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.2rem;
            }
            .hero-subtitle {
                font-size: 1.1rem;
            }
            h2 {
                font-size: 1.6rem;
            }
            .about-section, .products-section, .news-section, .contact-section {
                padding: 70px 0;
            }
        }
        @media (max-width: 576px) {
            .hero-title {
                font-size: 1.8rem;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            .btn-primary {
                padding: 10px 20px;
            }
        }
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            transition: all 0.8s;
        }
        .fade-in.visible {
            opacity: 1;
            transform: translateY(0);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--industrial-orange);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            cursor: pointer;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--primary-blue);
            transform: translateY(-5px);
        }