/* ==========================================================================
           1. CSS VARIABLES & BASE STYLES
           ========================================================================== */
        :root {
            --logo-black: #050505;
            --deep-black-blue: #08111F;
            --dark-navy: #0B1F33;
            --ny-bright-blue: #0D8FE8;
            --industrial-blue: #147AD6;
            --light-blue-bg: #EAF4FF;
            --clean-white: #FFFFFF;
            --light-gray: #F5F7FA;
            --silver-gray: #D9E1E8;
            --text-black: #111827;
            --muted-text: #667085;
            --border-gray: #E5E7EB;
            --font-main: 'Inter', sans-serif;
            --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --container-width: 1280px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-main);
            color: var(--text-black);
            background-color: var(--clean-white);
            line-height: 1.6;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition-smooth);
        }

        ul {
            list-style: none;
        }

        /* Common Layout Utilities */
        .section-padding {
            padding: 80px 24px;
        }

        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            width: 100%;
        }

        .text-center {
            text-align: center;
        }

        /* Section Headings */
        .section-header {
            margin-bottom: 50px;
            max-width: 800px;
        }
        .section-header.center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }

        .section-title {
            font-size: 2.25rem;
            font-weight: 800;
            color: var(--dark-navy);
            margin-bottom: 16px;
            text-transform: capitalize;
            letter-spacing: -0.02em;
        }

        .section-subtitle {
            font-size: 1.125rem;
            color: var(--muted-text);
            font-weight: 400;
        }

        /* Buttons & CTAs */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 28px;
            font-size: 0.95rem;
            font-weight: 600;
            border-radius: 6px;
            transition: var(--transition-smooth);
            cursor: pointer;
            gap: 8px;
        }

        .btn-primary {
            background-color: var(--ny-bright-blue);
            color: var(--clean-white);
            border: 1px solid var(--ny-bright-blue);
        }

        .btn-primary:hover {
            background-color: var(--industrial-blue);
            border-color: var(--industrial-blue);
            transform: translateY(-2px);
        }

        .btn-secondary {
            background-color: transparent;
            color: var(--dark-navy);
            border: 2px solid var(--dark-navy);
        }

        .btn-secondary:hover {
            background-color: var(--dark-navy);
            color: var(--clean-white);
            transform: translateY(-2px);
        }

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

        .btn-white-outline:hover {
            background-color: var(--clean-white);
            color: var(--dark-navy);
            transform: translateY(-2px);
        }

        /* Grid Utilities */
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 40px;
        }

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

        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        /* ==========================================================================
           2. SECTION SPECIFIC STYLES
           ========================================================================== */

        /* 1. Top Trust Bar */
        .top-bar {
            background-color: var(--dark-navy);
            color: var(--silver-gray);
            font-size: 0.8rem;
            padding: 10px 24px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .top-bar .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 10px;
        }

        .top-bar-left {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
        }

        .top-bar-dot {
            color: var(--ny-bright-blue);
            font-size: 0.5rem;
        }

        .top-bar-right {
            display: flex;
            gap: 20px;
        }

        .top-bar-right a {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .top-bar-right a:hover {
            color: var(--ny-bright-blue);
        }

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

        .home-logo-area {
            gap: 12px;
        }

        .logo-mark {
            width: 48px;
            height: 48px;
            object-fit: contain;
            border-radius: 10px;
            background: var(--clean-white);
            padding: 4px;
            box-shadow: 0 8px 20px rgba(8, 17, 31, 0.08);
            flex-shrink: 0;
        }

        .footer-logo-mark {
            background: rgba(255, 255, 255, 0.98);
            box-shadow: none;
        }

        .logo-icon {
            width: 42px;
            height: 42px;
            background-color: var(--logo-black);
            border-radius: 6px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 900;
            color: var(--ny-bright-blue);
            font-size: 1.4rem;
            border: 2px solid var(--ny-bright-blue);
        }

        .logo-text {
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--logo-black);
            letter-spacing: -0.5px;
        }

        .logo-text span {
            color: var(--ny-bright-blue);
        }

        nav ul {
            display: flex;
            gap: 28px;
        }

        nav a {
            font-weight: 550;
            font-size: 0.95rem;
            color: var(--dark-navy);
            padding: 8px 0;
            position: relative;
        }

        nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--ny-bright-blue);
            transition: var(--transition-smooth);
        }

        nav a:hover::after,
        nav a.active::after {
            width: 100%;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--dark-navy);
            cursor: pointer;
        }

        /* 3. Products Hero Section */
        .products-hero {
            background: linear-gradient(135deg, rgba(8, 17, 31, 0.72) 0%, rgba(11, 31, 51, 0.72) 100%), 
                        url('../images/home/banner/nuoyu_banner_3.webp') no-repeat center/cover;
            color: var(--clean-white);
            padding: 120px 24px;
            position: relative;
            overflow: hidden;
        }

        .products-hero-grid {
            display: grid;
            grid-template-columns: 1.25fr 0.75fr;
            gap: 40px;
            align-items: center;
        }

        .products-hero-title {
            font-size: 3.25rem;
            font-weight: 800;
            line-height: 1.15;
            margin-bottom: 20px;
            letter-spacing: -0.03em;
        }

        .products-hero-subtitle {
            font-size: 1.25rem;
            color: var(--ny-bright-blue);
            font-weight: 600;
            margin-bottom: 24px;
        }

        .products-hero-text {
            font-size: 1rem;
            color: var(--silver-gray);
            line-height: 1.7;
            margin-bottom: 35px;
        }

        .products-hero-ctas {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 40px;
        }

        .products-hero-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }

        .products-hero-tag {
            background: rgba(13, 143, 232, 0.15);
            border: 1px solid rgba(13, 143, 232, 0.3);
            color: var(--ny-bright-blue);
            padding: 6px 14px;
            border-radius: 4px;
            font-size: 0.85rem;
            font-weight: 600;
        }

        /* 4. Product Category Navigation Section */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: 40px;
        }

        .category-nav-card {
            background: var(--clean-white);
            border: 1px solid var(--border-gray);
            border-radius: 8px;
            padding: 30px;
            transition: var(--transition-smooth);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            position: relative;
            overflow: hidden;
        }

        .category-nav-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 100%;
            background-color: var(--ny-bright-blue);
            transform: scaleY(0);
            transition: var(--transition-smooth);
            transform-origin: bottom;
        }

        .category-nav-card:hover {
            border-color: var(--ny-bright-blue);
            box-shadow: 0 10px 25px rgba(0,0,0,0.05);
            transform: translateY(-2px);
        }

        .category-nav-card:hover::before {
            transform: scaleY(1);
        }

        .category-nav-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 20px;
        }

        .category-nav-icon {
            font-size: 2rem;
            color: var(--ny-bright-blue);
        }

        .category-nav-card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--dark-navy);
            margin-bottom: 12px;
        }

        .category-nav-card p {
            font-size: 0.85rem;
            color: var(--muted-text);
            line-height: 1.6;
            margin-bottom: 24px;
        }

        .category-nav-card .btn {
            align-self: flex-start;
            padding: 8px 16px;
            font-size: 0.8rem;
        }

        /* 5. Featured Product Center Section (With working Filter Sidebar) */
        .product-center-section {
            background-color: var(--light-blue-bg);
        }

        .product-center-layout {
            display: grid;
            grid-template-columns: 280px 1fr;
            gap: 40px;
        }

        /* Filter Sidebar */
        .filter-sidebar {
            background: var(--clean-white);
            border: 1px solid var(--border-gray);
            border-radius: 8px;
            padding: 30px 24px;
            height: fit-content;
            position: sticky;
            top: 100px;
            transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
        }

        .filter-sidebar.has-active-filters {
            border-color: rgba(13, 143, 232, 0.4);
            box-shadow: 0 16px 34px rgba(13, 143, 232, 0.08);
            transform: translateY(-4px);
        }

        .filter-group-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--dark-navy);
            margin-bottom: 20px;
            border-bottom: 2px solid var(--ny-bright-blue);
            padding-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .filter-section-group {
            margin-bottom: 30px;
        }

        .filter-label {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--dark-navy);
            margin-bottom: 12px;
            display: block;
        }

        .filter-options {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .filter-option {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.85rem;
            color: var(--text-black);
            cursor: pointer;
            user-select: none;
        }

        .filter-option input[type="radio"],
        .filter-option input[type="checkbox"] {
            accent-color: var(--ny-bright-blue);
            width: 16px;
            height: 16px;
            cursor: pointer;
        }

        .sidebar-cta {
            background: var(--dark-navy);
            color: var(--clean-white);
            padding: 24px 20px;
            border-radius: 6px;
            margin-top: 30px;
            text-align: center;
        }

        .sidebar-cta h4 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .sidebar-cta p {
            font-size: 0.75rem;
            color: var(--silver-gray);
            margin-bottom: 16px;
            line-height: 1.5;
        }

        .sidebar-cta .btn {
            width: 100%;
            padding: 10px;
            font-size: 0.8rem;
        }

        /* Product Grid */
        .product-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
        }

        .product-card {
            background: var(--clean-white);
            border: 1px solid var(--border-gray);
            border-radius: 8px;
            overflow: hidden;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            transition: var(--transition-smooth);
        }

        .product-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 30px rgba(0, 0, 0, 0.06);
            border-color: var(--ny-bright-blue);
        }

        .product-card.is-filtered-in {
            animation: nuoyuProductFadeIn 0.42s ease both;
        }

        .product-img-wrapper {
            background: #ffffff;
            aspect-ratio: 1 / 1;
            position: relative;
            overflow: hidden;
            padding: 22px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .product-img-wrapper img {
            width: 100%;
            height: 100%;
            object-fit: contain;
            object-position: center;
            transition: transform 0.5s ease, filter 0.35s ease;
        }

        .product-card:hover .product-img-wrapper img {
            transform: scale(1.07);
            filter: saturate(1.04);
        }

        .product-card-tag {
            position: absolute;
            top: 15px;
            left: 15px;
            background: var(--ny-bright-blue);
            color: var(--clean-white);
            padding: 4px 10px;
            border-radius: 4px;
            font-size: 0.75rem;
            font-weight: 600;
        }

        .product-card-content {
            padding: 24px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .product-card-content h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--dark-navy);
            margin-bottom: 8px;
        }

        .product-card-desc {
            font-size: 0.85rem;
            color: var(--muted-text);
            line-height: 1.5;
            margin-bottom: 16px;
        }

        .product-card-features {
            display: flex;
            flex-direction: column;
            gap: 8px;
            margin-bottom: 20px;
            border-top: 1px solid var(--border-gray);
            border-bottom: 1px solid var(--border-gray);
            padding: 15px 0;
        }

        .product-card-feature {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.8rem;
            font-weight: 550;
            color: var(--dark-navy);
        }

        .product-card-feature i {
            color: var(--ny-bright-blue);
        }

        .product-app-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            margin-bottom: 24px;
        }

        .product-app-tag {
            background-color: var(--light-gray);
            color: var(--muted-text);
            font-size: 0.7rem;
            font-weight: 600;
            padding: 4px 8px;
            border-radius: 4px;
            border: 1px solid var(--border-gray);
        }

        .product-card-actions {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
        }

        .product-card-actions .btn {
            padding: 10px 14px;
            font-size: 0.85rem;
        }

        @keyframes nuoyuProductFadeIn {
            from {
                opacity: 0;
                transform: translateY(16px) scale(0.985);
            }
            to {
                opacity: 1;
                transform: translateY(0) scale(1);
            }
        }

        /* 6. Product Selection Guide Section */
        .guide-cards {
            display: flex;
            flex-direction: column;
            gap: 40px;
            margin-top: 50px;
        }

        .guide-card {
            background: var(--clean-white);
            border: 1px solid var(--border-gray);
            border-radius: 10px;
            overflow: hidden;
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            align-items: center;
            box-shadow: 0 4px 15px rgba(0,0,0,0.02);
        }

        .guide-card:nth-child(even) {
            grid-template-columns: 1.2fr 1fr;
        }

        .guide-card:nth-child(even) .guide-img-wrapper {
            order: 2;
        }

        .guide-img-wrapper {
            height: 320px;
            background: var(--light-blue-bg);
        }

        .guide-img-wrapper img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .guide-content {
            padding: 45px;
        }

        .guide-recommendation-tag {
            background-color: var(--light-blue-bg);
            color: var(--ny-bright-blue);
            font-size: 0.75rem;
            font-weight: 700;
            padding: 6px 12px;
            border-radius: 4px;
            display: inline-block;
            margin-bottom: 16px;
            text-transform: uppercase;
        }

        .guide-content h3 {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--dark-navy);
            margin-bottom: 12px;
        }

        .guide-content p {
            font-size: 0.9rem;
            color: var(--muted-text);
            line-height: 1.6;
            margin-bottom: 24px;
        }

        /* 7. Product Comparison Section */
        .comparison-table-wrapper {
            overflow-x: auto;
            border-radius: 8px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.03);
            border: 1px solid var(--border-gray);
            margin-top: 40px;
        }

        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            background: var(--clean-white);
            text-align: left;
            font-size: 0.9rem;
        }

        .comparison-table th {
            background: var(--dark-navy);
            color: var(--clean-white);
            padding: 20px;
            font-weight: 700;
            font-size: 0.95rem;
        }

        .comparison-table td {
            padding: 18px 20px;
            border-bottom: 1px solid var(--border-gray);
        }

        .comparison-table tr:last-child td {
            border-bottom: none;
        }

        .comparison-table tr:nth-child(even) td {
            background-color: var(--light-gray);
        }

        .comparison-series-title {
            font-weight: 700;
            color: var(--ny-bright-blue);
        }

        /* 8. OEM / ODM Product Customization Section */
        .custom-section {
            background: linear-gradient(135deg, var(--deep-black-blue) 0%, var(--dark-navy) 100%);
            color: var(--clean-white);
        }

        .custom-section .section-title {
            color: var(--clean-white);
        }

        .custom-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .custom-collage-wrapper {
            position: relative;
            background: rgba(255, 255, 255, 0.02);
            border-radius: 12px;
            padding: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.08);
        }

        .custom-options-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 12px;
            margin-bottom: 35px;
        }

        .custom-option-tag {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.1);
            padding: 10px 14px;
            border-radius: 6px;
            font-size: 0.85rem;
            font-weight: 500;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .custom-option-tag i {
            color: var(--ny-bright-blue);
        }

        .custom-process-steps {
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin-bottom: 40px;
        }

        .custom-process-step {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.95rem;
            font-weight: 550;
            color: var(--silver-gray);
        }

        .custom-process-num {
            width: 28px;
            height: 28px;
            background-color: var(--ny-bright-blue);
            color: var(--clean-white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.85rem;
            font-weight: 700;
        }

        /* 9. Factory Support Section */
        .support-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 20px;
            margin-top: 40px;
        }

        .support-card {
            background: var(--clean-white);
            border: 1px solid var(--border-gray);
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 4px 15px rgba(0,0,0,0.02);
            transition: var(--transition-smooth);
            display: flex;
            flex-direction: column;
        }

        .support-card:hover {
            transform: translateY(-4px);
            border-color: var(--ny-bright-blue);
            box-shadow: 0 10px 25px rgba(0,0,0,0.05);
        }

        .support-card-img {
            height: 150px;
            background-color: var(--light-gray);
            overflow: hidden;
        }

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

        .support-card-content {
            padding: 20px;
            flex-grow: 1;
        }

        .support-card-icon {
            font-size: 1.5rem;
            color: var(--ny-bright-blue);
            margin-bottom: 12px;
        }

        .support-card-content h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--dark-navy);
            margin-bottom: 8px;
        }

        .support-card-content p {
            font-size: 0.8rem;
            color: var(--muted-text);
            line-height: 1.5;
        }

        /* 10. Certification & Compliance Support Section */
        .cert-section {
            background-color: var(--light-blue-bg);
        }

        .cert-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin-top: 40px;
        }

        .cert-document-card {
            background: var(--clean-white);
            border: 1px solid var(--silver-gray);
            padding: 24px;
            border-radius: 8px;
            transition: var(--transition-smooth);
        }

        .cert-document-card:hover {
            border-color: var(--ny-bright-blue);
            box-shadow: 0 8px 20px rgba(0,0,0,0.05);
        }

        .cert-badge-icon {
            width: 45px;
            height: 45px;
            background: var(--light-blue-bg);
            color: var(--ny-bright-blue);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.25rem;
            margin-bottom: 20px;
        }

        .cert-document-card h4 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--dark-navy);
            margin-bottom: 10px;
        }

        .cert-document-card p {
            font-size: 0.85rem;
            color: var(--muted-text);
            line-height: 1.5;
        }

        /* 11. Products FAQ Section */
        .faq-container {
            max-width: 800px;
            margin: 40px auto 0;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .faq-card {
            background: var(--light-gray);
            border: 1px solid var(--border-gray);
            border-radius: 6px;
            overflow: hidden;
            transition: var(--transition-smooth);
        }

        .faq-header {
            padding: 20px 24px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
        }

        .faq-header h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--dark-navy);
        }

        .faq-icon {
            font-size: 1.1rem;
            color: var(--ny-bright-blue);
            transition: var(--transition-smooth);
        }

        .faq-content {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out, padding 0.3s ease-out;
            background: var(--clean-white);
            border-top: 1px solid transparent;
        }

        /* FAQ Active Styles */
        .faq-card.active {
            border-color: var(--ny-bright-blue);
            box-shadow: 0 4px 15px rgba(0,0,0,0.02);
        }

        .faq-card.active .faq-icon {
            transform: rotate(45deg);
        }

        .faq-card.active .faq-content {
            padding: 20px 24px;
            max-height: 500px;
            border-top: 1px solid var(--border-gray);
        }

        /* 12. Final Product Inquiry CTA Section */
        .inquiry-section {
            background-color: var(--dark-navy);
            color: var(--clean-white);
        }

        .inquiry-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 50px;
        }

        .inquiry-form-card {
            background: var(--clean-white);
            padding: 40px;
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.15);
            color: var(--text-black);
        }

        .inquiry-form-card h3 {
            font-size: 1.75rem;
            font-weight: 800;
            color: var(--dark-navy);
            margin-bottom: 10px;
        }

        .inquiry-form-card p {
            font-size: 0.95rem;
            color: var(--muted-text);
            margin-bottom: 30px;
        }

        .form-row {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
            margin-bottom: 20px;
        }

        .form-group {
            margin-bottom: 20px;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .form-group.full {
            grid-column: span 2;
        }

        .form-group label {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--dark-navy);
        }

        .form-control {
            border: 1px solid var(--border-gray);
            background-color: var(--light-gray);
            padding: 12px 16px;
            border-radius: 6px;
            font-size: 0.9rem;
            color: var(--text-black);
            font-family: var(--font-main);
            outline: none;
            transition: var(--transition-smooth);
        }

        .form-control:focus {
            border-color: var(--ny-bright-blue);
            background-color: var(--clean-white);
            box-shadow: 0 0 0 3px rgba(13, 143, 232, 0.15);
        }

        textarea.form-control {
            height: 120px;
            resize: vertical;
        }

        .inquiry-ctas {
            display: flex;
            gap: 15px;
            flex-wrap: wrap;
        }

        .inquiry-helper-panel {
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.08);
            color: var(--clean-white);
            padding: 40px;
            border-radius: 10px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .helper-header h4 {
            font-size: 1.35rem;
            font-weight: 700;
            margin-bottom: 15px;
            border-bottom: 2px solid var(--ny-bright-blue);
            padding-bottom: 10px;
        }

        .helper-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
            margin-top: 20px;
        }

        .helper-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            font-size: 0.9rem;
            color: var(--silver-gray);
        }

        .helper-item i {
            color: var(--ny-bright-blue);
            margin-top: 3px;
        }

        /* 13. Footer */
        footer {
            background-color: var(--deep-black-blue);
            color: var(--silver-gray);
            padding: 80px 24px 30px;
            border-top: 4px solid var(--ny-bright-blue);
            font-size: 0.9rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 30px;
            margin-bottom: 60px;
        }

        .footer-col h5 {
            color: var(--clean-white);
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 24px;
            position: relative;
        }

        .footer-col h5::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 0;
            width: 30px;
            height: 2px;
            background-color: var(--ny-bright-blue);
        }

        .footer-col.about p {
            line-height: 1.6;
            margin-bottom: 20px;
            font-size: 0.85rem;
        }

        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .footer-col ul a:hover {
            color: var(--ny-bright-blue);
            padding-left: 5px;
        }

        .contact-details-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            font-size: 0.85rem;
        }

        .contact-details-list li {
            display: flex;
            gap: 10px;
        }

        .contact-details-list i {
            color: var(--ny-bright-blue);
            margin-top: 3px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 30px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 15px;
            font-size: 0.8rem;
        }

        .footer-socials {
            display: flex;
            gap: 12px;
        }

        .footer-socials a {
            width: 34px;
            height: 34px;
            background: rgba(255,255,255,0.05);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--clean-white);
            transition: var(--transition-smooth);
        }

        .footer-socials a:hover {
            background-color: var(--ny-bright-blue);
        }

        /* ==========================================================================
           3. RESPONSIVE BREAKPOINTS (MEDIA QUERIES)
           ========================================================================== */

        @media (max-width: 1200px) {
            .support-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .cert-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        @media (max-width: 992px) {
            .products-hero-grid,
            .product-center-layout,
            .guide-card,
            .guide-card:nth-child(even),
            .custom-grid,
            .inquiry-grid {
                grid-template-columns: 1fr;
                gap: 40px;
            }

            .filter-sidebar {
                position: static;
                top: auto;
            }

            .category-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .guide-img-wrapper {
                order: 1 !important;
            }

            .guide-content {
                order: 2 !important;
                padding: 30px;
            }

            .comparison-table-wrapper {
                overflow-x: scroll;
            }
        }

        @media (max-width: 768px) {
            .top-bar-right {
                display: none;
            }

            nav {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: var(--clean-white);
                border-top: 1px solid var(--border-gray);
                box-shadow: 0 10px 15px rgba(0,0,0,0.1);
                padding: 20px;
            }

            nav.active {
                display: block;
            }

            nav ul {
                flex-direction: column;
                gap: 15px;
            }

            .mobile-menu-btn {
                display: block;
            }

            .products-hero-title {
                font-size: 2.5rem;
            }

            .products-hero-ctas {
                flex-direction: column;
                align-items: stretch;
                gap: 12px;
            }

            .products-hero-ctas .btn,
            .inquiry-ctas .btn {
                width: 100%;
                justify-content: center;
                text-align: center;
            }

            .category-grid,
            .product-grid {
                grid-template-columns: 1fr;
            }

            .form-row {
                grid-template-columns: 1fr;
            }

            .form-group.full {
                grid-column: span 1;
            }

            .footer-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 576px) {
            .products-hero-title {
                font-size: 2rem;
                line-height: 1.18;
            }

            .products-hero-subtitle {
                font-size: 1.05rem;
            }

            .products-hero-text {
                margin-bottom: 24px;
            }

            .filter-sidebar,
            .inquiry-form-card,
            .inquiry-helper-panel {
                padding-left: 20px;
                padding-right: 20px;
            }

            .product-card-content {
                padding: 20px 18px;
            }

            .support-grid,
            .cert-grid {
                grid-template-columns: 1fr;
            }

            .section-title {
                font-size: 1.75rem;
            }

            .custom-options-list {
                grid-template-columns: 1fr;
            }
        }