*{box-sizing:border-box}body,html{margin:0;padding:0;font-family:system-ui,-apple-system,sans-serif;color:#1a1a1a}.container{max-width:720px;margin:0 auto;padding:24px}.chat{display:flex;flex-direction:column;gap:16px}.messages{min-height:300px}.msg{padding:12px 16px;border-radius:12px;margin-bottom:12px}.msg.user{background:#f0f4f8;align-self:flex-end}.msg.bot{background:#fff;border:1px solid #e0e0e0}.msg .citations{font-size:12px;color:#666;margin-top:8px}.input-row{display:flex;gap:8px}.input-row input{flex:1 1;padding:10px 12px;border:1px solid #ccc;border-radius:8px;font-size:14px}.input-row button{padding:10px 16px;background:#0066cc;color:white;border:none;border-radius:8px;cursor:pointer}.input-row button:disabled{opacity:.5}