:root{--bg:#0b0b0b;--card:#141414;--text:#fff;--muted:#ffffffb3;--border:#ffffff1f}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);place-items:start center;margin:0;padding:24px;font-family:system-ui,Arial,sans-serif;display:grid}.card{background:var(--card);border:1px solid var(--border);border-radius:16px;width:100%;max-width:760px;padding:20px}h1{margin:0 0 16px;font-size:22px}label{color:var(--muted);margin:14px 0 6px;font-size:14px;display:block}input,select,button{border:1px solid var(--border);width:100%;color:var(--text);background:#0f0f0f;border-radius:10px;padding:12px;font-size:16px}button{cursor:pointer;background:#2f6bff;border:0;margin-top:14px;font-weight:600}button:disabled{opacity:.6;cursor:not-allowed}pre{border:1px solid var(--border);white-space:pre-wrap;background:#0f0f0f;border-radius:12px;min-height:80px;margin-top:16px;padding:14px}.success{border-color:#32ffa059}.error{border-color:#ff5a5a73}