:root{font-family:system-ui,Segoe UI,Roboto,sans-serif;color:#0f172a;background:#f8fafc;line-height:1.45}*{box-sizing:border-box}body{margin:0}button{font:inherit;cursor:pointer}input,textarea,select{font:inherit}.panel{background:#fff;border:1px solid #e2e8f0;border-radius:10px;padding:12px 14px;margin-bottom:10px}.panel h3{margin:0 0 8px;font-size:.95rem;color:#334155}.muted{color:#64748b;font-size:.85rem}.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}.btn{border:none;border-radius:8px;padding:8px 14px;background:#2563eb;color:#fff}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-secondary{background:#64748b}.chat-box{border:1px solid #e2e8f0;border-radius:8px;padding:8px;max-height:260px;overflow-y:auto;background:#f1f5f9}.msg{margin:6px 0;padding:6px 8px;border-radius:6px}.msg.user{background:#dbeafe}.msg.assistant{background:#fff}