body{margin:0;font-family:Aptos,Arial,sans-serif;background:#f6f8fb;color:#12273d}.shell{max-width:980px;margin:40px auto;padding:28px;background:white;border:1px solid #dae0e6;border-radius:18px}h1{color:#071e37}button{margin-right:10px;padding:10px 16px;border:0;border-radius:10px;background:#071e37;color:white;font-weight:700;cursor:pointer}pre{margin-top:20px;background:#071e37;color:white;padding:18px;border-radius:12px;white-space:pre-wrap;min-height:160px}