:root{font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif}body{margin:0;background:#f4f6fb;color:#0f172a}.app{max-width:960px;margin:0 auto;padding:24px}.card{background:#fff;border:1px solid #d9e1f0;border-radius:12px;padding:16px;margin-top:16px}.row{display:flex;gap:8px;margin-top:12px}button{border:1px solid #2563eb;background:#2563eb;color:#fff;border-radius:8px;padding:8px 12px;cursor:pointer}input{margin-left:8px}pre{white-space:pre-wrap;word-break:break-word}