:root{color:#1a1a1a;background:#fff;font-family:system-ui,-apple-system,Segoe UI,sans-serif}body{margin:0}button{cursor:pointer;background:#f6f6f6;border:1px solid #ccc;border-radius:6px;padding:8px 16px;font-size:16px}button:disabled{opacity:.6;cursor:default}