:root{font-family:system-ui;color:#153c34;background:#f5faf7}body{margin:0}main{padding:22px;max-width:700px;margin:auto}h1{font-size:1.6rem}p{line-height:1.6}.note{font-size:.85rem;color:#536c64}label{display:block;font-weight:600}textarea{box-sizing:border-box;width:100%;min-height:90px;padding:12px;margin:8px 0;border:1px solid #aac5b9;border-radius:10px;font:inherit}button{padding:12px 18px;border:0;border-radius:9px;background:#174b3d;color:white;font:inherit}button:disabled{opacity:.5}#demo-messages p{padding:12px;border-radius:10px;background:white;white-space:pre-wrap}