[v4] Try to use in new project with inertiajs and got error

[DarksLight2]

@layer base is used but no matching @tailwind base directive is present.

app.css

@import 'tailwindcss';

@source '../../vendor/laravel/framework/src/Illuminate/Pagination/resources/views/*.blade.php';

@theme {
  --font-sans: Figtree, ui-sans-serif, system-ui, sans-serif,
    'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji';
}

/*
  The default border color has changed to `currentColor` in Tailwind CSS v4,
  so we've added these compatibility styles to make sure everything still
  looks the same as it did with Tailwind CSS v3.

  If we ever want to remove these styles, we need to add an explicit border
  color utility to any element that depends on these defaults.
*/
@layer base {
  *,
  ::after,
  ::before,
  ::backdrop,
  ::file-selector-button {
    border-color: var(--color-gray-200, currentColor);
  }
}

[wongjn]

Judging from the stack trace, it seems you're using v3 but with v4 syntax.

[DarksLight2]

I just run npx @tailwindcss/upgrade@next (from doc) and got this result.

[DarksLight2]

I had a @tailwindcss/vite and @tailwindcss/postcss in my package.json. I remove for postcss and its work