:root{font-family:system-ui,-apple-system,Segoe UI,Roboto,Noto Sans JP,sans-serif}body{margin:0;padding:16px}.row{display:flex;gap:16px;align-items:flex-start;flex-wrap:wrap}canvas{border:1px solid #999;image-rendering:pixelated;touch-action:none}.panel{min-width:240px}.palette{display:grid;grid-template-columns:repeat(8,28px);gap:6px;margin-bottom:12px}.swatch{width:28px;height:28px;border:1px solid #666;cursor:pointer}.swatch.selected{outline:3px solid #000}.buttons{display:grid;gap:8px;grid-template-columns:1fr 1fr;margin-bottom:10px}textarea{width:100%;box-sizing:border-box}