Does not work with Tailwind (or with CSS variables)

[Barbapapazes]

🐛 The bug

I have the following css for Tailwind CSS 4:

@theme {
    --font-sans: 'DM Sans', sans-serif;
    --font-sofia: 'Sofia sans', sans-serif;
    --font-mono: 'DM Mono', monospace;
}

and it does not work. With the following code:

.google-font {
  font-family: "Poppins", sans-serif;
}

🛠️ To reproduce

Barbapapazes/fontaine-fork@3379c57

🌈 Expected behaviour

It should work with a CSS variable as it works with font-familly

ℹ️ Additional context

No response