---
category: Foundations
---

The hairline this pack rules its pages with — 1px of `--hair`, generous margin,
nothing else. `strong` steps up to `--hair-strong` where two parts of a page
genuinely separate. On an espresso section both tones re-derive from the cream
ink instead of the dark one, because a dark hairline on a dark field is an
invisible line pretending to be structure. Use rules to phrase a page the way a
printed document does; if a rule is decoration rather than punctuation, delete
it and let the spacing do the work.

```tsx
<Card title="Method">
  <p>Ninety-one sources, read end to end.</p>
  <Rule />
  <p>Fourteen were excluded as syndicated duplicates.</p>
</Card>
```