:root{color-scheme:light dark;--bg:#0e1116;--fg:#e6edf3;--muted:#8b949e;--accent:#cc0000;--card:#161b22;--border:#30363d}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,system-ui,sans-serif;line-height:1.5}main{max-width:640px;margin:0 auto;padding:4rem 1.5rem}h1{font-size:1.75rem;margin:0 0 .5rem}p{color:var(--muted);margin:0 0 1rem}.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:1.5rem;margin-top:1.5rem}.btn{display:inline-block;background:var(--accent);color:white;text-decoration:none;padding:.75rem 1.25rem;border-radius:8px;font-weight:600;border:0;cursor:pointer}.btn:hover{filter:brightness(1.1)}code{background:rgba(255,255,255,.06);padding:.1em .35em;border-radius:4px;font-size:.9em}.muted{color:var(--muted);font-size:.9rem}