body{color:#222;background:#f6f7f9;margin:0;font-family:Arial,sans-serif}main{background:#fff;border:1px solid #ddd;border-radius:10px;max-width:900px;margin:40px auto;padding:24px}.row{gap:10px;margin-bottom:14px;display:flex}select,textarea,button{font:inherit}select{flex:1;padding:10px}textarea{box-sizing:border-box;width:100%;margin-bottom:14px;padding:12px;font-family:monospace}button{cursor:pointer;padding:10px 16px}.message{white-space:pre-wrap;background:#f2f2f2;margin-top:16px;padding:12px}