[Feature Request] - Namespace css variables

```css
:root {
  --radius: 0.625rem;
  --background: oklch(1 0 0);
  --primary: oklch(0.205 0 0);
  --primary-foreground: oklch(0.985 0 0);
  --secondary: oklch(0.97 0 0);
  ....
```

seems like there is a large possibility these will conflict with variables in existing repos.
Please consider:
```css
:root {
  --zard-radius: 0.625rem;
  --zard-background: oklch(1 0 0);
  ...

```