Prepending the fallback style was the option I was considering, but it does really defeat the whole purpose of the idea. You'd end up with the same styles that

Prepending the fallback style was the option I was considering, but it does really defeat the whole purpose of the idea. You'd end up with the same styles that you would have without variables, plus all the duplicate rules using variables, all for no gain. If I were using a preprocessor, I'd just use the in-built variables of that preprocessor I guess.