:root{--bg:#f3f4f6;--card:#fff;--muted:#6b7280;--accent:#0f172a}*{box-sizing:border-box}body{margin:0;background:var(--bg);font-family:Inter,system-ui,Arial;color:#0f172a}.app{max-width:1100px;margin:28px auto;padding:20px;border-radius:12px;background:var(--card);box-shadow:0 8px 30px #0206170f}.header{display:flex;justify-content:space-between;align-items:center}.controls{display:flex;gap:8px;align-items:center}textarea,input,select{width:100%;padding:10px;border-radius:8px;border:1px solid #e6eef8}.btn{padding:8px 12px;border-radius:8px;border:none;background:var(--accent);color:#fff;cursor:pointer}.section{margin-top:18px;padding:12px;border-radius:10px;border:1px solid #eef2f7;background:#fbfdff}.row{display:flex;gap:12px;align-items:center}.avatar{width:160px;height:160px;border-radius:12px;display:flex;align-items:center;justify-content:center;background:#eef2f7}.small{font-size:13px;color:var(--muted)}.messages{max-height:320px;overflow:auto;border:1px solid #eef2f7;padding:8px;border-radius:8px;margin-top:12px;background:#fff}.message{margin-bottom:10px;padding:8px;border-radius:8px}.user{background:#e0f2fe;text-align:right}.bot{background:#eef2f7;text-align:left}.center{display:flex;align-items:center;justify-content:center}