Font weights aren't variables
Font weights are scattered all over the various components, atoms, etc. These should be variables (or mixins). It makes it very difficult to use a thin font or custom weights!
Ack! They aren't! Just curious, what parts are you customizing? I'd like to figure out if there are other variables we can expose to make customizing your admin easier.
I mostly was focused on colors, font weight, and font names. (we use a light font for most of our typography)
I've replaced all instances of font weights with font variables. I've also updated the customization doc to include our font variables:
https://github.com/vigetlabs/active_material/blob/master/docs/customization.md#font-variables
On a component-by-component basis, a lot of variables are defined at the top of each file to allow for overides: https://github.com/vigetlabs/active_material/tree/master/app/assets/stylesheets/active_material/components