body{margin:0;font-family:Arial;background:#0b1220;color:#fff}
.app{display:grid;grid-template-columns:250px 1fr;height:100vh}
.sidebar{background:#111;padding:10px}
.main{display:flex;flex-direction:column}
#chat{flex:1;overflow:auto;padding:10px}
.bar{display:flex;gap:10px;padding:10px;background:#111}
textarea{flex:1}
.user{color:#6cf}
.assistant{color:#9f9}