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# Application Layout Framework (ALF)
A set of UI primitives and components.
## Usage
Naming conventions follow Tailwind — delimited with a `_` instead of `-` to
enable object access — with a couple exceptions:
**Spacing**
Uses "t-shirt" sizes `xxs`, `xs`, `sm`, `md`, `lg`, `xl` and `xxl` instead of
increments of 4px. We only use a few common spacings, and otherwise typically
rely on many one-off values.
**Text Size**
Uses "t-shirt" sizes `xxs`, `xs`, `sm`, `md`, `lg`, `xl` and `xxl` to match our
type scale.
**Line Height**
The text size atoms also apply a line-height with the same value as the size,
for a 1:1 ratio. `tight` and `normal` are retained for use in the few places
where we need leading.
### Atoms
An (mostly-complete) set of style definitions that match Tailwind CSS selectors.
These are static and reused throughout the app.
```tsx
import { atoms } from '#/alf'
<View style={[atoms.flex_row]} />
```
### Theme
Any values that rely on the theme, namely colors.
```tsx
const t = useTheme()
<View style={[atoms.flex_row, t.atoms.bg]} />
```
### Breakpoints
```tsx
const b = useBreakpoints()
if (b.gtMobile) {
// render tablet or desktop UI
}
```
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