How to make a separate class for the first element in the PUG mixin?

Question

Pug

https://codepen.io/anon/pen/JyNMWz?editors=1000
I made such a mixin for nested lists, but due to layout specificity, the very first link should have a separate class and not have common classes with other links (i.e. .Services should have their own styles and not interact with the styles of other links). Can this be done somehow?

Answer 1

For example, add an index and check it
each item, index in data.items

Answer 2

this is a native task for CSS and not for the template engine.
Is it just me?)