Changing font-size when hoisted or focused

How do I change the font-size when I am Focused In or Hoisted? I currently enhance my hierarchy by reducing font size with each depth level. It can get pretty small. I’d like to be able to focus in on these items and have their font-size increase.

You can use:

item[focused] {
  font-size: 28;  

To adjust the focused item. Unfortunately you can’t adjust any of the other items relative to that one.