Squared enamel button; caps letterspaced label, text-glyph arrows (ENTER THE GAME ↓).

```jsx
<Button>Enter the game ↓</Button>
<Button variant="metal">Open the library</Button>
<Button variant="ghost" size="sm">Explore →</Button>
```

Variants: primary (emerald), metal (gold, ceremonial), ghost (hairline outline), danger (garnet). Never pill-shaped; never lowercase labels.