body{font-family:system-ui;background:#f4f1ea;color:#222;margin:0}main{max-width:720px;margin:5rem auto;padding:2rem;background:#fff;border-radius:16px;box-shadow:0 8px 30px #0001}h1{letter-spacing:.08em}.chat{min-height:320px;border:1px solid #ddd;border-radius:8px;padding:1rem;margin:1rem 0}.chat p{padding:.5rem;border-bottom:1px solid #eee}input{padding:.8rem;border:1px solid #bbb;border-radius:6px;flex:1}button{padding:.8rem 1rem;border:0;border-radius:6px;background:#14532d;color:#fff;font-weight:700}form,.login{display:flex;gap:.5rem}