* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --primary: #1a1a1a;
            --accent: #1e3a5f;
            --light: #f8f8f8;
            --border: #e5e5e5;
            --text: #333;
            --text-light: #666;
            --white: #ffffff;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            color: var(--text);
            line-height: 1.6;
            background: var(--white);
        }

        /* ===== Header ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: var(--white);
            box-shadow: 0 1px 3px rgba(0,0,0,0.08);
        }

        .header-top {
            padding: 16px 24px;
            text-align: center;
        }

        .logo {
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }

        .logo img {
            height: 40px;
        }

        .logo-text {
            font-size: 15px;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.2;
        }

        .logo-text span {
            color: var(--accent);
        }

        .nav-bar {
            background: var(--primary);
            padding: 0 24px;
        }

        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .nav-links {
            display: flex;
            list-style: none;
        }

        .nav-links a {
            display: block;
            color: var(--white);
            text-decoration: none;
            padding: 14px 20px;
            font-size: 14px;
            font-weight: 500;
            transition: background 0.3s;
        }

        .nav-links a:hover {
            background: rgba(255,255,255,0.1);
        }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .lang-switch {
            color: var(--white);
            cursor: pointer;
            font-size: 14px;
            font-weight: 500;
            padding: 14px 8px;
        }

        .lang-switch:hover {
            background: rgba(255,255,255,0.1);
        }

        .menu-toggle {
            display: none;
            color: var(--white);
            font-size: 24px;
            cursor: pointer;
            padding: 10px;
        }

        /* ===== Hero ===== */
        .hero {
            margin-top: 96px;
            height: 70vh;
            min-height: 500px;
            background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)), url('assets/hero-control-room.jpg');
            background-size: cover;
            background-position: center;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            color: var(--white);
        }

        .hero-content {
            max-width: 800px;
            padding: 0 24px;
        }

        .hero h1 {
            font-size: 48px;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 20px;
        }

        .hero p {
            font-size: 18px;
            opacity: 0.9;
            margin-bottom: 32px;
        }

        .btn {
            display: inline-block;
            padding: 14px 36px;
            font-size: 15px;
            font-weight: 600;
            text-decoration: none;
            border-radius: 4px;
            transition: all 0.3s;
            cursor: pointer;
            border: none;
        }

        .btn-primary {
            background: var(--accent);
            color: var(--white);
        }

        .btn-primary:hover {
            background: #d04e20;
        }

        .btn-outline {
            background: transparent;
            color: var(--white);
            border: 2px solid var(--white);
            margin-left: 12px;
        }

        .btn-outline:hover {
            background: var(--white);
            color: var(--primary);
        }

        /* ===== Sections ===== */
        .section {
            padding: 80px 24px;
        }

        .section-alt {
            background: var(--light);
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .section-tag {
            font-size: 14px;
            font-weight: 600;
            color: var(--accent);
            text-transform: uppercase;
            letter-spacing: 2px;
            margin-bottom: 12px;
        }

        .section-title {
            font-size: 36px;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 16px;
        }

        .section-subtitle {
            font-size: 17px;
            color: var(--text-light);
            max-width: 700px;
            margin-bottom: 48px;
        }

        /* ===== About ===== */
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .about-img {
            width: 100%;
            border-radius: 8px;
            box-shadow: 0 10px 40px rgba(0,0,0,0.1);
        }

        .about-text h3 {
            font-size: 28px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 20px;
        }

        .about-text p {
            color: var(--text-light);
            margin-bottom: 16px;
            line-height: 1.8;
        }

        /* ===== Stats ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            text-align: center;
        }

        .stat-item h3 {
            font-size: 42px;
            font-weight: 800;
            color: var(--accent);
            margin-bottom: 8px;
        }

        .stat-item p {
            font-size: 15px;
            color: var(--text-light);
        }

        /* ===== Products ===== */
        .products-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .product-card {
            background: var(--white);
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 2px 12px rgba(0,0,0,0.06);
            transition: transform 0.3s, box-shadow 0.3s;
            cursor: pointer;
        }

        .product-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 30px rgba(0,0,0,0.12);
        }

        .product-card-img {
            width: 100%;
            height: 240px;
            overflow: hidden;
            background: var(--light);
        }

        .product-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }

        .product-card:hover .product-card-img img {
            transform: scale(1.05);
        }

        .product-card-body {
            padding: 24px;
        }

        .product-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 8px;
        }

        .product-card p {
            font-size: 14px;
            color: var(--text-light);
            margin-bottom: 16px;
        }

        .product-card .read-more {
            color: var(--accent);
            font-size: 14px;
            font-weight: 600;
            text-decoration: none;
        }

        /* ===== Applications ===== */
        .apps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .app-item {
            text-align: center;
            padding: 30px 20px;
        }

        .app-item .app-icon {
            width: 60px;
            height: 60px;
            margin: 0 auto 16px;
            background: var(--light);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
        }

        .app-item h4 {
            font-size: 17px;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 8px;
        }

        .app-item p {
            font-size: 14px;
            color: var(--text-light);
        }

        /* ===== News ===== */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .news-card {
            background: var(--white);
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 2px 12px rgba(0,0,0,0.06);
            cursor: pointer;
            transition: transform 0.3s;
        }

        .news-card:hover {
            transform: translateY(-3px);
        }

        .news-card-img {
            width: 100%;
            height: 200px;
            overflow: hidden;
        }

        .news-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .news-card-body {
            padding: 20px;
        }

        .news-card-date {
            font-size: 13px;
            color: var(--text-light);
            margin-bottom: 8px;
        }

        .news-card h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 10px;
            line-height: 1.4;
        }

        .news-card p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.6;
        }

        /* ===== Contact ===== */
        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
        }

        .contact-info h3 {
            font-size: 24px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 24px;
        }

        .contact-item {
            display: flex;
            gap: 16px;
            margin-bottom: 24px;
        }

        .contact-item .icon {
            width: 48px;
            height: 48px;
            background: var(--light);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            flex-shrink: 0;
        }

        .contact-item h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 4px;
        }

        .contact-item p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.6;
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--primary);
            color: rgba(255,255,255,0.8);
            padding: 60px 24px 20px;
        }

        .footer-grid {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            color: var(--white);
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 20px;
        }

        .footer-col p, .footer-col a {
            font-size: 14px;
            color: rgba(255,255,255,0.6);
            line-height: 1.8;
            text-decoration: none;
        }

        .footer-col a:hover {
            color: var(--accent);
        }

        .footer-bottom {
            max-width: 1200px;
            margin: 0 auto;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 13px;
            color: rgba(255,255,255,0.4);
            text-align: center;
        }

        /* ===== Product Detail Page ===== */
        .product-page {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: var(--white);
            z-index: 2000;
            overflow-y: auto;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
        }

        .product-page.active {
            opacity: 1;
            visibility: visible;
        }

        .product-page-inner {
            max-width: 1100px;
            margin: 0 auto;
            padding: 120px 24px 60px;
        }

        .breadcrumb {
            font-size: 14px;
            color: var(--text-light);
            margin-bottom: 24px;
        }

        .breadcrumb a {
            color: var(--accent);
            text-decoration: none;
        }

        .product-page-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--accent);
            font-weight: 600;
            font-size: 15px;
            margin-bottom: 32px;
            cursor: pointer;
        }

        .product-page-back:hover {
            gap: 12px;
        }

        .product-detail-title {
            font-size: 36px;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 24px;
        }

        .gallery {
            margin-bottom: 40px;
        }

        .gallery-main {
            width: 100%;
            height: 400px;
            border-radius: 8px;
            overflow: hidden;
            background: var(--light);
            margin-bottom: 12px;
        }

        .gallery-main img {
            width: 100%;
            height: 100%;
            object-fit: contain;
        }

        .gallery-thumbs {
            display: flex;
            gap: 10px;
            overflow-x: auto;
        }

        .gallery-thumb {
            width: 80px;
            height: 60px;
            border-radius: 4px;
            overflow: hidden;
            cursor: pointer;
            opacity: 0.6;
            border: 2px solid transparent;
        }

        .gallery-thumb.active {
            opacity: 1;
            border-color: var(--accent);
        }

        .gallery-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .detail-section {
            margin-top: 40px;
            padding-top: 32px;
            border-top: 1px solid var(--border);
        }

        .detail-section h4 {
            font-size: 22px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 20px;
        }

        .detail-type-block {
            margin-bottom: 32px;
            padding: 28px;
            background: var(--light);
            border-radius: 8px;
        }

        .detail-type-block h5 {
            font-size: 18px;
            font-weight: 700;
            color: var(--accent);
            margin-bottom: 16px;
        }

        .detail-type-img {
            display: block;
            width: 100%;
            max-width: 600px;
            margin: 0 auto 16px auto;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        }

        .detail-type-desc {
            font-size: 15px;
            line-height: 1.8;
            color: var(--text);
            margin-bottom: 12px;
        }

        .detail-type-specs {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 12px;
            margin-top: 16px;
        }

        .detail-spec-item {
            background: var(--white);
            padding: 12px 16px;
            border-radius: 6px;
            border-left: 3px solid var(--accent);
        }

        .detail-spec-label {
            font-size: 12px;
            color: var(--text-light);
            margin-bottom: 4px;
        }

        .detail-spec-value {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
        }

        .detail-table-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--primary);
            margin-top: 20px;
            margin-bottom: 8px;
        }

        .detail-table-img {
            display: block;
            width: 100%;
            max-width: 600px;
            margin: 0 auto;
            border: 1px solid var(--border);
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.08);
        }

        .selection-steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin-top: 20px;
        }

        .selection-step {
            padding: 24px;
            background: var(--white);
            border-radius: 8px;
            border: 1px solid var(--border);
        }

        .selection-step-num {
            display: inline-block;
            width: 36px;
            height: 36px;
            line-height: 36px;
            text-align: center;
            background: var(--accent);
            color: var(--white);
            border-radius: 50%;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .selection-step h6 {
            font-size: 16px;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 8px;
        }

        .selection-step p {
            font-size: 14px;
            line-height: 1.7;
            color: var(--text-light);
        }

        .product-types-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
            gap: 16px;
            margin-top: 16px;
        }

        .product-type-card {
            border: 1px solid var(--border);
            border-radius: 8px;
            overflow: hidden;
            background: var(--white);
        }

        .product-type-img {
            width: 100%;
            height: 120px;
            background: var(--light);
            overflow: hidden;
        }

        .product-type-img img {
            width: 100%;
            height: 100%;
            object-fit: contain;
            display: block;
            margin: 0 auto;
        }

        .product-type-name {
            padding: 10px;
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            text-align: center;
        }

        .modal-cta {
            margin-top: 40px;
            padding: 32px;
            background: var(--light);
            border-radius: 8px;
            text-align: center;
        }

        .modal-cta p {
            font-size: 16px;
            color: var(--text);
            margin-bottom: 20px;
        }

        /* ===== News Detail Page ===== */
        .news-page {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: var(--white);
            z-index: 2000;
            overflow-y: auto;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
        }

        .news-page.active {
            opacity: 1;
            visibility: visible;
        }

        .news-page-inner {
            max-width: 800px;
            margin: 0 auto;
            padding: 120px 24px 60px;
        }

        .news-detail-title {
            font-size: 32px;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 16px;
            line-height: 1.3;
        }

        .news-detail-meta {
            font-size: 14px;
            color: var(--text-light);
            margin-bottom: 32px;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--border);
        }

        .news-detail-content {
            font-size: 16px;
            line-height: 1.9;
            color: var(--text);
        }

        .news-detail-content p {
            margin-bottom: 20px;
        }

        .news-detail-content h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--primary);
            margin-top: 32px;
            margin-bottom: 16px;
        }

        /* ===== Preload ===== */
        .preload {
            position: absolute;
            width: 1px;
            height: 1px;
            overflow: hidden;
            opacity: 0;
        }

        /* ===== Responsive ===== */
        @media (max-width: 992px) {
            .products-grid, .news-grid, .apps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .about-grid, .contact-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .hero h1 {
                font-size: 36px;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: var(--primary);
                flex-direction: column;
            }
            .nav-links.active {
                display: flex;
            }
            .menu-toggle {
                display: block;
            }
            .products-grid, .news-grid, .apps-grid {
                grid-template-columns: 1fr;
            }
            .hero h1 {
                font-size: 28px;
            }
            .section-title {
                font-size: 28px;
            }
        }
    
        /* Back to top button */
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 48px;
            height: 48px;
            background: var(--accent);
            color: var(--white);
            border: none;
            border-radius: 50%;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.2);
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            z-index: 3000;
        }

        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }

        .back-to-top:hover {
            background: #16304f;
            transform: translateY(-3px);
            box-shadow: 0 6px 16px rgba(0,0,0,0.25);
        }