:root{color-scheme:light}*{box-sizing:border-box}body,html{margin:0;font-family:Inter,Arial,sans-serif;background:#f5f6f8;color:#141414}.layout{display:grid;grid-template-columns:260px 1fr 320px;grid-gap:16px;gap:16px;min-height:100vh;padding:16px}.panel{background:#fff;border-radius:12px;border:1px solid #e8e8e8;padding:16px}.chat-list{height:calc(100vh - 180px);overflow:auto;display:flex;flex-direction:column;gap:10px;margin-bottom:12px}.msg{padding:10px 12px;border-radius:10px;line-height:1.4;white-space:pre-wrap}.msg.user{background:#ecf3ff;align-self:flex-end}.msg.assistant{background:#f2f2f2;align-self:flex-start}form{display:flex;gap:8px}button,input{border:1px solid #d8d8d8;border-radius:8px;padding:10px 12px}input{flex:1 1}button{background:#1f6feb;color:#fff;border:none;cursor:pointer}h3{margin-top:0}