I've been working on CSS tooling (on and off) since August 2013, when I wrote AbsurdJS. Later, in January 2016, I "invented" CSSX - writing CSS directly in JavaScript. None of those became a thing, but they were incredibly interesting experiments. I had some time during the holidays and decided to materialize an idea that I'm shaping the last couple of months. And so I "accidentally" wrote a CSS compiler. It's called Azbuka (it means "alphabet" in Bulgarian).