:root{font-family:system-ui,-apple-system,Segoe UI,sans-serif;color:#202124;background:#f5f7f8}
body{margin:0}.top{background:#263238;color:white;padding:14px 18px;font-weight:650}
main{max-width:520px;margin:0 auto;padding:18px}.box{background:white;border:1px solid #d8dee2;border-radius:8px;padding:14px}
label{display:block;font-size:13px;margin:10px 0 4px}input,button{font:inherit}
input{width:100%;box-sizing:border-box;padding:9px;border:1px solid #b9c2c8;border-radius:6px}
button{border:0;border-radius:6px;background:#1261a6;color:white;padding:9px 12px;cursor:pointer;margin-top:10px}
pre{white-space:pre-wrap;background:#111;color:#d7ffd7;padding:10px;border-radius:6px;max-height:220px;overflow:auto}