With the release of Advanced Themer 2.9 comes huge enhancements to the Advanced CSS feature. You can now render SASS with partials :)
This is a game changer for me, and I will show you why. I can now manage my own SASS framework with just Bricks and AT. With AT I can then export and import a json file with all AT, Theme & Style settings in a single file.
In this video I show a limited SASS framework created in "Advanced CSS". I then export the entire settings and framework and import into a brand new WordPress installation.