:root {
            --olive-dark: #1a2b1a;
            --olive: #2E4A2E;
            --olive-mid: #3a5c3a;
            --olive-light: #4a704a;
            --gold: #D4AF37;
            --gold-light: #e8c84a;
            --gold-dark: #b8960f;
            --white: #F5F5F5;
            --off-white: #d5d5d5;
            --text-light: #c8c8c8;
            --text-muted: #999;
            --danger-red: #8b1a1a;
            --danger-bright: #c0392b;
            --border-dark: #1a301a;
            --card-bg: #243824;
            --code-bg: #0f180f;
            --table-stripe: #2c402c;
            --table-hover: #334a33;
            --font-heading: 'Barlow Condensed', 'Rajdhani', 'Oswald', 'Arial Narrow', sans-serif;
            --font-body: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', 'Monaco', monospace;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
            --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
            --shadow-gold: 0 0 20px rgba(212, 175, 55, 0.25);
            --radius-sm: 4px;
            --radius-md: 8px;
            --radius-lg: 14px;
            --transition: 0.25s ease;
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            background-color: var(--olive-dark);
            background-image:
                radial-gradient(ellipse at 50% 0%, rgba(212, 175, 55, 0.04) 0%, transparent 60%),
                radial-gradient(ellipse at 85% 20%, rgba(74, 112, 74, 0.12) 0%, transparent 50%),
                url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cdefs%3E%3Cpattern id='grid' width='60' height='60' patternUnits='userSpaceOnUse'%3E%3Cpath d='M60 0L0 0 0 60' fill='none' stroke='%233a5c3a' stroke-width='0.3' stroke-opacity='0.15'/%3E%3C/pattern%3E%3C/defs%3E%3Crect width='60' height='60' fill='url(%23grid)'/%3E%3C/svg%3E");
            color: var(--white);
            font-family: var(--font-body);
            line-height: 1.7;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        /* ── Classification Banner ── */
        .class-banner {
            background: var(--danger-red);
            color: #fff;
            text-align: center;
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 0.75rem;
            letter-spacing: 0.35em;
            text-transform: uppercase;
            padding: 6px 12px;
            position: sticky;
            top: 0;
            z-index: 1000;
            border-bottom: 2px solid var(--danger-bright);
            word-spacing: 0.5em;
        }
        .class-banner span {
            animation: pulse-banner 2s ease-in-out infinite;
        }
        @keyframes pulse-banner {
            0%,
            100% {
                opacity: 1;
            }
            50% {
                opacity: 0.55;
            }
        }

        /* ── Container ── */
        .container {
            max-width: 960px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* ── Header ── */
        header {
            text-align: center;
            padding: 50px 20px 30px;
            position: relative;
        }
        header .logo-mark {
            display: inline-block;
            width: 56px;
            height: 56px;
            border: 3px solid var(--gold);
            border-radius: 50%;
            position: relative;
            margin-bottom: 14px;
            background: rgba(212, 175, 55, 0.06);
            box-shadow: var(--shadow-gold);
        }
        header .logo-mark::after {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 12px;
            height: 12px;
            background: var(--gold);
            border-radius: 50%;
            box-shadow: 0 0 16px var(--gold-light);
        }
        header h1 {
            font-family: var(--font-heading);
            font-size: clamp(2rem, 5vw, 3.2rem);
            font-weight: 800;
            letter-spacing: 0.04em;
            text-transform: uppercase;
            color: var(--white);
            line-height: 1.1;
            margin-bottom: 6px;
        }
        header h1 .highlight {
            color: var(--gold);
            display: inline-block;
            text-shadow: 0 0 30px rgba(212, 175, 55, 0.4);
        }
        header .subtitle {
            font-family: var(--font-heading);
            font-size: 1.1rem;
            font-weight: 400;
            letter-spacing: 0.12em;
            text-transform: uppercase;
            color: var(--text-muted);
            margin-top: 2px;
        }
        header .divider {
            width: 80px;
            height: 3px;
            background: var(--gold);
            margin: 16px auto 0;
            border-radius: 2px;
            box-shadow: var(--shadow-gold);
        }

        /* ── Section ── */
        section {
            margin: 36px 0;
        }
        .section-title {
            font-family: var(--font-heading);
            font-size: 1.5rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            color: var(--gold);
            border-left: 4px solid var(--gold);
            padding-left: 14px;
            margin-bottom: 18px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .section-title .icon {
            font-size: 1.3rem;
            filter: drop-shadow(0 0 4px rgba(212, 175, 55, 0.5));
        }
        .section-title::after {
            content: '';
            flex: 1;
            height: 1px;
            background: linear-gradient(to right, rgba(212, 175, 55, 0.35), transparent);
            margin-left: 10px;
        }

        /* ── Cards ── */
        .card {
            background: var(--card-bg);
            border: 1px solid var(--olive-mid);
            border-radius: var(--radius-lg);
            padding: 24px 28px;
            box-shadow: var(--shadow-md);
            transition: var(--transition);
        }
        .card:hover {
            border-color: var(--olive-light);
            box-shadow: var(--shadow-lg), 0 0 0 1px rgba(212, 175, 55, 0.08);
        }
        .card p {
            color: var(--text-light);
            margin-bottom: 10px;
        }
        .card p:last-child {
            margin-bottom: 0;
        }

        /* ── Table ── */
        .table-wrapper {
            overflow-x: auto;
            border-radius: var(--radius-md);
            border: 1px solid var(--olive-mid);
            box-shadow: var(--shadow-md);
        }
        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.92rem;
            min-width: 600px;
        }
        table thead {
            background: var(--olive);
            font-family: var(--font-heading);
            text-transform: uppercase;
            letter-spacing: 0.06em;
            font-weight: 700;
            font-size: 0.85rem;
        }
        table thead th {
            padding: 14px 16px;
            text-align: left;
            color: var(--gold-light);
            border-bottom: 2px solid var(--gold-dark);
        }
        table tbody td {
            padding: 12px 16px;
            border-bottom: 1px solid var(--border-dark);
            color: var(--text-light);
        }
        table tbody tr {
            background: var(--card-bg);
            transition: var(--transition);
        }
        table tbody tr:nth-child(even) {
            background: var(--table-stripe);
        }
        table tbody tr:hover {
            background: var(--table-hover);
        }
        table tbody td:first-child {
            font-weight: 600;
            color: var(--white);
            white-space: nowrap;
        }

        /* ── Schematic Block ── */
        .schematic {
            background: var(--code-bg);
            border: 1px solid var(--olive-mid);
            border-radius: var(--radius-md);
            padding: 22px 24px;
            font-family: var(--font-mono);
            font-size: 0.82rem;
            color: #a0d4a0;
            line-height: 1.8;
            overflow-x: auto;
            white-space: pre;
            box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.5);
            position: relative;
        }
        .schematic::before {
            content: 'SCHEMATIC';
            position: absolute;
            top: -10px;
            left: 16px;
            background: var(--olive);
            color: var(--gold-light);
            font-family: var(--font-heading);
            font-size: 0.7rem;
            letter-spacing: 0.15em;
            padding: 2px 10px;
            border-radius: 3px;
            font-weight: 700;
        }
        .schematic .arrow {
            color: var(--gold);
            font-weight: 700;
        }
        .schematic .node {
            color: #e8c84a;
            font-weight: 700;
        }

        /* ── Formula ── */
        .formula-block {
            background: var(--code-bg);
            border-left: 3px solid var(--gold);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            padding: 16px 20px;
            margin: 14px 0;
            font-family: var(--font-mono);
            font-size: 0.9rem;
            color: var(--gold-light);
            letter-spacing: 0.03em;
            box-shadow: var(--shadow-sm);
        }
        .formula-block .result {
            color: #fff;
            font-weight: 700;
            font-size: 1.05rem;
        }

        /* ── Grid ── */
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
        }
        @media (max-width: 768px) {
            .grid-2,
            .grid-3 {
                grid-template-columns: 1fr;
            }
            header h1 {
                font-size: 1.6rem;
            }
            .section-title {
                font-size: 1.2rem;
            }
            .card {
                padding: 16px 18px;
            }
            table {
                font-size: 0.78rem;
            }
            table thead th,
            table tbody td {
                padding: 8px 10px;
            }
            .schematic {
                font-size: 0.68rem;
                padding: 18px 14px;
            }
        }

        /* ── Highlight Box ── */
        .highlight-box {
            background: rgba(212, 175, 55, 0.06);
            border: 1px solid rgba(212, 175, 55, 0.25);
            border-radius: var(--radius-md);
            padding: 18px 22px;
            text-align: center;
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 1rem;
            letter-spacing: 0.04em;
            color: var(--gold-light);
            box-shadow: var(--shadow-gold);
            margin: 16px 0;
        }

        /* ── Badge ── */
        .badge {
            display: inline-block;
            background: var(--danger-red);
            color: #fff;
            font-family: var(--font-heading);
            font-size: 0.7rem;
            font-weight: 700;
            letter-spacing: 0.1em;
            text-transform: uppercase;
            padding: 3px 10px;
            border-radius: 3px;
            margin-right: 6px;
            vertical-align: middle;
        }

        /* ── Footer ── */
        footer {
            text-align: center;
            padding: 40px 20px;
            border-top: 1px solid var(--olive-mid);
            margin-top: 40px;
            color: var(--text-muted);
            font-size: 0.8rem;
            letter-spacing: 0.04em;
        }
        footer .footer-logo {
            font-family: var(--font-heading);
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--gold);
            text-transform: uppercase;
            letter-spacing: 0.1em;
            margin-bottom: 6px;
        }

        /* ── Scrollbar ── */
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }
        ::-webkit-scrollbar-track {
            background: var(--olive-dark);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--olive-mid);
            border-radius: 4px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--olive-light);
        }

        /* ── Print styles ── */
        @media print {
            body {
                background: #fff;
                color: #000;
            }
            .class-banner {
                background: #000;
                color: #fff;
            }
            .card,
            .schematic,
            .formula-block {
                background: #f5f5f5;
                border-color: #ccc;
                color: #000;
            }
            .section-title {
                color: #000;
                border-left-color: #000;
            }
            table thead {
                background: #ddd;
            }
        }