body { font-family: system-ui, -apple-system, Segoe UI, sans-serif; max-width: 760px; margin: 40px auto; padding: 0 20px; }
    button { font: inherit; padding: 10px 14px; border: 1px solid #111; background: #111; color: white; border-radius: 6px; cursor: pointer; }
    pre { white-space: pre-wrap; background: #f5f5f5; padding: 12px; border-radius: 6px; }
    .muted { color: #666; }