:root {
            --bg: #f4f6f8;
            --surface: #ffffff;
            --text: #111827;
            --muted: #4b5563;
            --border: #e5e7eb;
            --link: #0b66d1;
        }

        @media (prefers-color-scheme: dark) {
            :root {
                --bg: #0f1115;
                --surface: #171a21;
                --text: #f3f4f6;
                --muted: #c3c8d3;
                --border: #2a3240;
                --link: #8ec2ff;
            }
        }

        * {
            box-sizing: border-box;
        }

        body {
            margin: 0;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.65;
        }

        .wrap {
            max-width: 880px;
            margin: 0 auto;
            padding: 28px 20px 44px;
        }

        .card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 14px;
            padding: 28px;
        }

        h1 {
            margin: 0 0 8px;
            font-size: clamp(1.7rem, 3.6vw, 2.1rem);
        }

        h2 {
            margin-top: 28px;
            margin-bottom: 10px;
            font-size: 1.18rem;
        }

        h3 {
            margin-top: 16px;
            margin-bottom: 8px;
            font-size: 1rem;
        }

        p, li {
            color: var(--muted);
            margin-top: 0;
        }

        ul {
            margin-top: 6px;
            padding-left: 20px;
        }

        .meta {
            font-weight: 600;
            color: var(--muted);
            margin-bottom: 22px;
        }

        .footer-links {
            margin-top: 24px;
            padding-top: 16px;
            border-top: 1px solid var(--border);
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }

        a {
            color: var(--link);
        }