This is really smart, good job. I look forward to taking this for a spin, the point of not adding a build step is critical for some of my current work. I think

This is really smart, good job. I look forward to taking this for a spin, the point of not adding a build step is critical for some of my current work. I think the time for using CSS preprocessors is over, they add very little value now we can use variables and combined with tricks like these we can speed up our builds!