# transparencyReduce

> Sugar over `media("(prefers-reduced-transparency: reduce)", input)`.

```ts
import { transparencyReduce } from "@sdxc/u/responsive";
```

Sugar over `media("(prefers-reduced-transparency: reduce)", input)`.

Supplies an explicit solid fallback — an opaque background, a stronger
border — for a surface styled only inside the no-preference branch.

## Quick reference

Every documented call, beside the CSS it emits.

| Call | CSS |
| --- | --- |
| `u.transparencyReduce(u.bg())` | `css({ "@media (prefers-reduced-transparency: reduce)": { backgroundColor: "var(--ui-bg, Canvas)" } })` |

## Examples

### Basic example

Use `transparencyReduce(...)` to apply utilities when the reader asks for less transparency, like a solid background behind a frosted pane. Turn on Reduce transparency in your system's accessibility settings to see the pane turn solid:

```tsx
<div mix={[...]}>
	<div mix={[backdropBlur("lg"), transparencyReduce(bg("color.neutral.900")), ...]}>
		Frosted glass
	</div>
</div>
```

## Applying on a state

Wrap the call in a state utility to scope it to one selector.

```ts
u.hover(u.transparencyReduce(u.bg()))
```

## Customizing your theme

### Customizing colors

Define a palette as `--ui-color-{name}-{50..950}` and map a tone onto it with the `--ui-{tone}-*` variables, the way `theme.css` maps the built-in ones:

```css
:root {
	--ui-color-info-50: oklch(0.97 0.02 230);
	--ui-color-info-200: oklch(0.88 0.06 230);
	--ui-color-info-500: oklch(0.62 0.16 230);
	--ui-color-info-600: oklch(0.52 0.18 230);
	--ui-color-info-900: oklch(0.3 0.1 230);

	--ui-info-bg-tint: var(--ui-color-info-50);
	--ui-info-bg-solid: var(--ui-color-info-600);
	--ui-info-fg: var(--ui-color-info-600);
	--ui-info-fg-muted: var(--ui-color-info-500);
	--ui-info-fg-emphasis: var(--ui-color-info-900);
	--ui-info-fg-on-solid: white;
	--ui-info-border: var(--ui-color-info-200);
	--ui-info-border-strong: var(--ui-color-info-600);
	--ui-info-ring: var(--ui-color-info-500);
}
```

```ts
declare module "@sdxc/u" {
	interface ColorPalettes {
		info: true;
	}
	interface SemanticTones {
		info: true;
	}
}
```

The new name is then accepted wherever the scale is:

```ts
bg("info")
```

## Signature

```ts
u.transparencyReduce(input: UtilityInput<Node>)
```