Thanks a lot. I like very much the styling for the filters. It looks great!
Unfortunately there are changes to the filter settings in the upcoming version of Item Inspector that causes the filters not being styled anymore.
There will be support for a much larger number of filters. I decided to place then in groups of similarly themed filters to make it easier to users to find the one they need. I suspect (I don’t really know) that the introduction of groups changes the html enough to break your selectors.
The filters themselves are not changed. They will just be grouped. Hopefully this will be an easy fix.
I will try the CSS variables to see how hey workout. At first sight it looks good.