:root {
            --primary: #0f172a;
            --secondary: #1e293b;
            --accent: #0284c7;
            --accent-hover: #0369a1;
            --text-main: #334155;
            --text-muted: #64748b;
            --bg-canvas: #f8fafc;
            --card-bg: #ffffff;
            --border-line: #e2e8f0;
            --tag-bg: #f1f5f9;
            --tag-border: #cbd5e1;
            --alert-bg: #f0fdf4;
            --alert-border: #86efac;
            --alert-text: #166534;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            line-height: 1.7;
            color: var(--text-main);
            background-color: var(--bg-canvas);
            padding: 0;
            margin: 0;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        header {
            background: #ffffff;
            border-bottom: 1px solid var(--border-line);
            padding: 16px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: sticky;
            top: 0;
            z-index: 100;
            backdrop-filter: blur(8px);
            background: rgba(255, 255, 255, 0.95);
        }
        header a.brand {
            font-weight: 800;
            font-size: 1.15rem;
            color: var(--primary);
            text-decoration: none;
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        header a.brand span.badge {
            background: #e0f2fe;
            color: #0369a1;
            font-size: 0.72rem;
            padding: 2px 8px;
            border-radius: 4px;
            font-weight: 700;
            text-transform: uppercase;
        }
        header nav {
            display: flex;
            align-items: center;
            gap: 18px;
        }
        header nav a {
            color: var(--text-muted);
            text-decoration: none;
            font-size: 0.88rem;
            font-weight: 600;
            transition: color 0.15s ease;
        }
        header nav a:hover { color: var(--accent); }
        
        .container {
            max-width: 1080px;
            margin: 36px auto;
            padding: 0 24px 80px;
        }

        /* FACTORY POSITIONING BANNER */
        .identity-banner {
            background: #ffffff;
            border: 1px solid var(--border-line);
            border-left: 5px solid var(--primary);
            border-radius: 0 10px 10px 0;
            padding: 24px 28px;
            margin-bottom: 32px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.03);
        }
        .identity-meta {
            font-size: 0.78rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--accent);
            font-weight: 700;
            margin-bottom: 8px;
        }
        .identity-banner h1 {
            font-size: clamp(1.45rem, 3.5vw, 1.95rem);
            line-height: 1.3;
            color: var(--primary);
            margin-bottom: 14px;
            letter-spacing: -0.02em;
        }
        .identity-banner p {
            font-size: 0.96rem;
            color: var(--text-main);
            margin-bottom: 12px;
            line-height: 1.65;
        }

        .scope-notice {
            background: #f8fafc;
            border: 1px solid var(--border-line);
            border-radius: 8px;
            padding: 14px 18px;
            font-size: 0.86rem;
            color: var(--text-muted);
            margin-top: 14px;
            line-height: 1.6;
        }

        h2 {
            font-size: clamp(1.2rem, 2.5vw, 1.45rem);
            color: var(--primary);
            margin: 44px 0 16px;
            padding-bottom: 8px;
            border-bottom: 2px solid var(--border-line);
            letter-spacing: -0.01em;
        }
        h3 {
            font-size: 1.12rem;
            color: var(--secondary);
            margin: 24px 0 10px;
        }
        p { margin-bottom: 16px; font-size: 0.96rem; }
        
        /* MOBILE SCROLL HINT */
        .mobile-scroll-hint {
            display: none;
            background: #f0f9ff;
            color: #0284c7;
            font-size: 0.76rem;
            font-weight: 600;
            padding: 6px 12px;
            border-radius: 6px;
            border: 1px dashed #bae6fd;
            text-align: center;
            margin-bottom: 10px;
        }

        /* TOPOLOGY DIAGRAM */
        .diagram-container {
            background: #ffffff;
            border: 1px solid var(--border-line);
            border-radius: 12px;
            padding: 24px;
            margin: 28px 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
            text-align: center;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
        }
        .diagram-container svg {
            display: block;
            margin: 0 auto;
            min-width: 780px;
            max-width: 100%;
            height: auto;
        }
        .diagram-caption {
            font-size: 0.84rem;
            color: var(--text-muted);
            margin-top: 14px;
            font-weight: 500;
        }

        /* SPECIFICATION TABLE */
        .table-responsive {
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            margin: 24px 0 36px;
            background: #ffffff;
            border-radius: 10px;
            border: 1px solid var(--border-line);
            box-shadow: 0 2px 6px rgba(0, 0, 0, 0.02);
        }
        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.88rem;
            text-align: left;
            min-width: 820px;
        }
        th, td {
            padding: 14px 16px;
            border-bottom: 1px solid var(--border-line);
            vertical-align: top;
            line-height: 1.55;
        }
        th {
            background: #f8fafc;
            color: var(--primary);
            font-weight: 700;
            font-size: 0.82rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        tr:last-child td { border-bottom: none; }
        tr:hover td { background-color: #fafbfc; }

        .native-tag {
            display: inline-block;
            background: var(--tag-bg);
            color: #1e293b;
            padding: 3px 8px;
            border-radius: 5px;
            font-size: 0.76rem;
            font-weight: 600;
            margin: 2px 4px 3px 0;
            border: 1px solid var(--tag-border);
            line-height: 1.35;
        }
        .benchmark-tag {
            display: inline-block;
            background: #fef3c7;
            color: #92400e;
            padding: 3px 8px;
            border-radius: 5px;
            font-size: 0.76rem;
            font-weight: 600;
            margin: 2px 4px 3px 0;
            border: 1px solid #fde68a;
            line-height: 1.35;
        }

        .btn-link-sku {
            display: inline-block;
            background: var(--primary);
            color: #ffffff !important;
            padding: 6px 12px;
            border-radius: 6px;
            font-size: 0.80rem;
            font-weight: 700;
            text-decoration: none;
            margin: 3px 0;
            white-space: nowrap;
            transition: all 0.15s ease;
            box-shadow: 0 1px 3px rgba(0,0,0,0.08);
        }
        .btn-link-sku:hover {
            background: var(--accent);
            box-shadow: 0 3px 6px rgba(0,0,0,0.12);
        }

        /* 4 PRODUCT MATRICES */
        .product-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 20px;
            margin: 28px 0;
        }
        .product-box {
            background: #ffffff;
            border: 1px solid var(--border-line);
            border-radius: 10px;
            padding: 20px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            transition: all 0.2s ease;
            box-shadow: 0 2px 4px rgba(0,0,0,0.02);
        }
        .product-box:hover {
            border-color: var(--accent);
            box-shadow: 0 8px 18px rgba(0, 0, 0, 0.06);
            transform: translateY(-2px);
        }
        .product-box .sku-code {
            font-size: 0.74rem;
            font-weight: 700;
            color: var(--accent);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 6px;
        }
        .product-box h4 {
            font-size: 1.05rem;
            color: var(--primary);
            margin-bottom: 10px;
            line-height: 1.35;
        }
        .product-box ul {
            padding-left: 18px;
            font-size: 0.85rem;
            color: var(--text-main);
            margin-bottom: 18px;
            flex-grow: 1;
            line-height: 1.6;
        }
        .product-box li { margin-bottom: 4px; }
        .product-box a.btn-cta {
            display: block;
            background: var(--accent);
            color: #ffffff !important;
            padding: 10px 14px;
            border-radius: 6px;
            font-size: 0.85rem;
            font-weight: 700;
            text-decoration: none;
            text-align: center;
            transition: background 0.15s ease;
        }
        .product-box a.btn-cta:hover { background: var(--accent-hover); }

        .verification-panel {
            background: #f8fafc;
            border: 1px solid var(--border-line);
            border-radius: 10px;
            padding: 26px;
            margin-top: 40px;
            box-shadow: 0 2px 6px rgba(0,0,0,0.02);
        }
        .verification-panel h3 { margin-top: 0; margin-bottom: 8px; }
        .panel-action-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 16px;
        }
        .panel-action-buttons .btn-link-sku {
            padding: 10px 20px;
            font-size: 0.90rem;
            border-radius: 6px;
        }
        .btn-action-rfq {
            background: var(--accent) !important;
        }
        .btn-action-rfq:hover {
            background: var(--accent-hover) !important;
        }

        footer {
            margin-top: 60px;
            padding-top: 24px;
            border-top: 1px solid var(--border-line);
            font-size: 0.84rem;
            color: var(--text-muted);
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
        }

        /* RESPONSIVE ADAPTATION: TABLET & IPAD (max-width: 900px) */
        @media (max-width: 900px) {
            .container {
                padding: 0 20px 60px;
                margin: 24px auto;
            }
            .product-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .mobile-scroll-hint {
                display: block;
            }
        }

        /* RESPONSIVE ADAPTATION: MOBILE SMARTPHONE (max-width: 680px) */
        @media (max-width: 680px) {
            header {
                flex-direction: column;
                align-items: flex-start;
                gap: 14px;
                padding: 14px 16px;
            }
            header a.brand {
                font-size: 1.05rem;
            }
            header nav {
                display: flex;
                width: 100%;
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
                gap: 8px;
                padding-bottom: 4px;
            }
            header nav a {
                margin-left: 0;
                white-space: nowrap;
                background: #f1f5f9;
                padding: 7px 12px;
                border-radius: 6px;
                font-size: 0.80rem;
                font-weight: 600;
            }
            .container {
                padding: 0 14px 50px;
                margin: 16px auto;
            }
            .identity-banner {
                padding: 18px 16px;
                border-radius: 8px;
                border-left-width: 4px;
                margin-bottom: 24px;
            }
            .identity-banner h1 {
                font-size: 1.35rem;
                line-height: 1.35;
                margin-bottom: 10px;
            }
            .identity-banner p {
                font-size: 0.88rem;
                line-height: 1.6;
            }
            .scope-notice {
                padding: 12px 14px;
                font-size: 0.82rem;
            }
            h2 {
                font-size: 1.20rem;
                margin: 32px 0 12px;
            }
            h3 {
                font-size: 1.02rem;
            }
            .diagram-container {
                padding: 14px 8px;
                border-radius: 8px;
                margin: 20px 0;
            }
            .diagram-caption {
                font-size: 0.78rem;
                padding: 0 8px;
            }
            .table-responsive {
                margin: 16px 0 28px;
                border-radius: 8px;
            }
            th, td {
                padding: 10px 12px;
                font-size: 0.80rem;
            }
            .native-tag, .benchmark-tag {
                font-size: 0.72rem;
                padding: 2px 6px;
                margin: 2px 2px 2px 0;
            }
            .btn-link-sku {
                padding: 6px 10px;
                font-size: 0.75rem;
            }
            .product-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .product-box {
                padding: 16px;
                border-radius: 8px;
            }
            .product-box a.btn-cta {
                padding: 11px 14px;
                font-size: 0.88rem;
            }
            .verification-panel {
                padding: 18px 16px;
                border-radius: 8px;
                margin-top: 28px;
            }
            .panel-action-buttons {
                flex-direction: column;
                gap: 10px;
            }
            .panel-action-buttons .btn-link-sku {
                display: block;
                width: 100%;
                text-align: center;
                padding: 12px 16px !important;
                font-size: 0.88rem;
            }
            footer {
                margin-top: 40px;
                font-size: 0.78rem;
                flex-direction: column;
                gap: 8px;
            }
        }

        /* EXTRA COMPACT MOBILE (max-width: 380px) */
        @media (max-width: 380px) {
            header a.brand {
                font-size: 0.95rem;
            }
            .identity-banner h1 {
                font-size: 1.25rem;
            }
        }