How to change font size depending on sublist depth?

[PgBiel]

Here’s one way to do it:

#let list-counter = counter("list")

#show list: set text(14pt)
#show list: it => {
  list-counter.step()

  context {
    set text(10pt) if list-counter.get().first() == 2
    set text(20pt) if list-counter.get().first() >= 3
    it
  }
  list-counter.update(i => i - 1)
}

- A bit larger
  - smol
  - smol
    - well this is large!
- A bit larger
  - smol