:root{--accent:#0066cc;--bg:#f4f7fb;--card:#fff}
  body{font-family:Inter,Arial,sans-serif;background:var(--bg);margin:0;padding:20px;display:flex;min-height:100vh;align-items:center;justify-content:center}
  .card{background:var(--card);max-width:820px;width:100%;padding:22px;border-radius:12px;box-shadow:0 8px 24px rgba(10,20,40,0.06)}
  h1{margin:0 0 12px;color:var(--accent)}
  textarea{width:100%;min-height:120px;padding:12px;border-radius:8px;border:1px solid #ddd;resize:vertical;font-size:14px}
  .row{display:flex;gap:10px;margin-top:12px;flex-wrap:wrap}
  button{background:var(--accent);color:#fff;border:none;padding:10px 14px;border-radius:8px;cursor:pointer}
  .out{white-space:pre-wrap;background:#f9fbff;border:1px solid #eee;padding:12px;border-radius:8px;margin-top:12px;max-height:240px;overflow:auto}