First line: a compact terracotta pill switch for inline on/off toggles.

```jsx
const [adv, setAdv] = React.useState(false);
<Switch checked={adv} onChange={setAdv} label="Расширенный" />
```

Notes
- Controlled — track fills terracotta and the knob slides on `checked`.
- For mutually-exclusive choices use tabs/segmented controls instead; this is a binary toggle only.