html,
    body {
        height: auto !important;
        overflow-y: auto !important;
    }

    .column iframe {
        height: 100vh;
        display: block;
    }
 /* ── Tokens ── */
        :root {
            --gc-green-dark:   #1B4332;
            --gc-green-mid:    #2D6A4F;
            --gc-green-light:  #52B788;
            --gc-green-tint:   #E8F5E9;
            --gc-bg:           #F4F8F5;
            --gc-white:        #FFFFFF;
            --gc-text:         #1A1A1A;
            --gc-text-soft:    #4B5563;
            --gc-border:       #C8E6C9;
            --gc-radius:       8px;
            --gc-font:         -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
        }

        /* ── Wrapper ── */
        .gc-wrap {
            background: var(--gc-bg);
            font-family: var(--gc-font);
            color: var(--gc-text);
            font-size: 16px;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }

        .gc-inner {
            max-width: 900px;
            margin: 0 auto;
            padding: 56px 24px 72px;
        }

        /* ── Headings ── */
        .gc-wrap h1 {
            font-size: clamp(1.6rem, 4vw, 2.2rem);
            font-weight: 800;
            color: var(--gc-green-dark);
            line-height: 1.25;
            margin: 0 0 12px;
            letter-spacing: -0.02em;
        }

        .gc-wrap h2 {
            font-size: clamp(1.15rem, 3vw, 1.4rem);
            font-weight: 700;
            color: var(--gc-green-dark);
            margin: 48px 0 16px;
            padding-left: 14px;
            border-left: 4px solid var(--gc-green-light);
            line-height: 1.3;
            text-align: left;
        }

        .gc-wrap h3 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--gc-text);
            margin: 28px 0 6px;
            text-align: left;
        }

        /* ── Paragraphs & Intro ── */
        .gc-wrap p {
            margin: 0 0 18px;
            color: var(--gc-text);
        }

        .gc-intro {
            font-size: 1.1rem;
            color: var(--gc-text-soft);
            margin-bottom: 0;
            padding-bottom: 40px;
            border-bottom: 1px solid var(--gc-border);
        }

        /* ── Links ── */
        .gc-wrap a {
            color: var(--gc-green-mid);
            text-decoration: underline;
            text-decoration-color: var(--gc-green-light);
            text-underline-offset: 3px;
            transition: color 0.15s;
        }

        .gc-wrap a:hover {
            color: var(--gc-green-dark);
        }

        /* ── Divider ── */
        .gc-divider {
            border: none;
            border-top: 1px solid var(--gc-border);
            margin: 48px 0;
        }

        /* ── Tables ── */
        .gc-wrap table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.95rem;
            margin: 20px 0 28px;
            background: var(--gc-white);
            border-radius: var(--gc-radius);
            overflow: hidden;
            box-shadow: 0 1px 4px rgba(0,0,0,0.06);
        }

        .gc-wrap thead {
            background: var(--gc-green-dark);
            color: var(--gc-white);
        }

        .gc-wrap thead th {
            padding: 13px 16px;
            text-align: left;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.04em;
            text-transform: uppercase;
        }

        .gc-wrap tbody tr {
            border-bottom: 1px solid var(--gc-border);
            transition: background 0.1s;
        }

        .gc-wrap tbody tr:last-child {
            border-bottom: none;
        }

        .gc-wrap tbody tr:hover {
            background: var(--gc-green-tint);
        }

        .gc-wrap tbody td {
            padding: 12px 16px;
            vertical-align: top;
            color: var(--gc-text);
        }

        .gc-wrap tbody td:first-child {
            font-weight: 600;
            white-space: nowrap;
            color: var(--gc-green-dark);
        }

        /* ── Code / shortcut keys ── */
        .gc-wrap kbd {
            display: inline-block;
            background: var(--gc-green-tint);
            border: 1px solid var(--gc-border);
            border-radius: 4px;
            padding: 1px 7px;
            font-family: monospace;
            font-size: 0.88rem;
            color: var(--gc-green-dark);
            font-weight: 600;
            white-space: nowrap;
        }

        /* ── Lists ── */
        .gc-wrap ul,
        .gc-wrap ol {
            margin: 8px 0 24px 0;
            padding-left: 24px;
        }

        .gc-wrap li {
            margin-bottom: 10px;
            color: var(--gc-text);
        }

        .gc-wrap li strong {
            color: var(--gc-green-dark);
        }

        /* ── Tip list (icon bullets) ── */
        .gc-tips {
            list-style: none;
            padding-left: 0;
        }

        .gc-tips li {
            padding: 14px 16px 14px 48px;
            position: relative;
            background: var(--gc-white);
            border: 1px solid var(--gc-border);
            border-radius: var(--gc-radius);
            margin-bottom: 10px;
        }

        .gc-tips li::before {
            content: "♠";
            position: absolute;
            left: 16px;
            top: 14px;
            color: var(--gc-green-light);
            font-size: 1rem;
        }

        /* ── Related games grid ── */
        .gc-games {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
            gap: 12px;
            list-style: none;
            padding: 0;
            margin: 16px 0 0;
        }

        .gc-games li {
            margin: 0;
        }

        .gc-games a {
            display: block;
            padding: 14px 18px;
            background: var(--gc-white);
            border: 1px solid var(--gc-border);
            border-radius: var(--gc-radius);
            text-decoration: none;
            color: var(--gc-green-dark);
            font-weight: 600;
            font-size: 0.95rem;
            transition: background 0.15s, border-color 0.15s, transform 0.1s;
        }

        .gc-games a:hover {
            background: var(--gc-green-tint);
            border-color: var(--gc-green-light);
            transform: translateY(-1px);
            color: var(--gc-green-dark);
            text-decoration: none;
        }

        .gc-games a span {
            display: block;
            font-size: 0.82rem;
            font-weight: 400;
            color: var(--gc-text-soft);
            margin-top: 3px;
        }

        /* ── FAQ ── */
        .gc-faq-item {
            background: var(--gc-white);
            border: 1px solid var(--gc-border);
            border-radius: var(--gc-radius);
            padding: 20px 22px;
            margin-bottom: 12px;
        }

        .gc-faq-item h3 {
            margin: 0 0 8px;
            color: var(--gc-green-dark);
            font-size: 1rem;
        }

        .gc-faq-item p {
            margin: 0;
            color: var(--gc-text-soft);
            font-size: 0.95rem;
        }

        /* ── Mode cards ── */
        .gc-modes {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 14px;
            margin: 16px 0 24px;
        }

        .gc-mode-card {
            background: var(--gc-white);
            border: 2px solid var(--gc-border);
            border-radius: var(--gc-radius);
            padding: 20px;
        }

        .gc-mode-card.easy { border-color: var(--gc-green-light); }
        .gc-mode-card.hard { border-color: #E57373; }

        .gc-mode-card strong {
            display: block;
            font-size: 1rem;
            margin-bottom: 6px;
            color: var(--gc-green-dark);
        }

        .gc-mode-card.hard strong { color: #C62828; }

        .gc-mode-card p {
            margin: 0;
            font-size: 0.92rem;
            color: var(--gc-text-soft);
        }

       

        /* ── Mobile ── */
        @media (max-width: 600px) {
            .gc-inner { padding: 36px 16px 56px; }
            .gc-modes { grid-template-columns: 1fr; }
            .gc-wrap table { font-size: 0.85rem; }
            .gc-wrap thead th { padding: 10px 12px; }
            .gc-wrap tbody td { padding: 10px 12px; }
            .gc-wrap tbody td:first-child { white-space: normal; }
        }