Brand action button — gradient primary for the main CTA, signal/lime pills for one-off accents, ghost/outline for quiet actions.

```jsx
<Button variant="primary">Jetzt anhören</Button>
<Button variant="signal">Neue Folge</Button>
<Button variant="ghost">Mehr erfahren</Button>
```

Variants: `primary` (gradient, 10px radius, brand-coloured lift) · `signal` (swissAI pink pill) · `lime` (atrete lime pill on dark-green text) · `ghost` (violet outline) · `ink` (solid dark pill) · `outline` (hairline pill on paper). Only one signal-coloured button per view.