Sass!

Syntactically Awesome Style Sheets (or Sass) is something akin to LESS (Leaner CSS) in that it provides a way to "use variables in style sheets" which is to say you may compile from its markup with variables to a .css file where variables end up becoming whatever they become. There is a Chirpy thing going on with Sass in that it can be smart enough to know when a Sass file has changed and that a new CSS file should be generated. (Chirpy will render out minified .js files for regular readable .js files and, I believe, CSS files for LESS files upon changeups.)