:root {
            --bg: #0b0e13;
            --card: #151c28;
            --border: #243049;
            --text: #e6edf3;
            --muted: #8b949e;
            --accent: #58a6ff;
            --danger: #f85149;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: var(--bg);
            color: var(--text);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        .shell {
            flex: 1;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        .topbar {
            border-bottom: 1px solid var(--border);
            background: rgba(11, 14, 19, 0.92);
            padding: 0.85rem 1.5rem;
        }

        .topbar-inner {
            max-width: 900px;
            margin: 0 auto;
        }

        .back {
            color: var(--muted);
            text-decoration: none;
            font-size: 0.88rem;
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            gap: 0.45rem;
            padding: 0.45rem 0.9rem;
            border-radius: 6px;
            transition: color 0.2s, background 0.2s;
            margin-left: -0.9rem;
        }

        .back:hover {
            color: var(--text);
            background: rgba(255, 255, 255, 0.04);
            text-decoration: none;
        }

        .back:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        main {
            flex: 1;
            padding: 1.75rem 1.5rem 2.5rem;
        }

        .wrap {
            max-width: 900px;
            margin: 0 auto;
        }

        .card {
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: 14px;
            padding: 1.75rem 1.5rem;
        }

        h1 {
            font-size: 1.55rem;
            margin-bottom: 0.35rem;
            letter-spacing: -0.02em;
        }

        .meta {
            color: var(--muted);
            font-size: 0.85rem;
            margin-bottom: 1.5rem;
        }

        h2 {
            margin-top: 1.35rem;
            margin-bottom: 0.45rem;
            font-size: 1.02rem;
            color: var(--text);
        }

        p,
        li {
            color: var(--muted);
            line-height: 1.75;
            font-size: 0.92rem;
            margin-bottom: 0.65rem;
        }

        ul {
            padding-left: 1.15rem;
            margin-bottom: 0.75rem;
        }

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

        a:hover {
            text-decoration: underline;
        }

        .highlight {
            margin-top: 1.25rem;
            padding: 1rem 1.1rem;
            border-radius: 10px;
            border: 1px solid rgba(248, 81, 73, 0.28);
            background: rgba(248, 81, 73, 0.08);
            color: var(--danger);
            font-size: 0.88rem;
            line-height: 1.65;
        }