Stylus documentation: http://learnboost.github.io/stylus/
Stylus tutorial: http://learnboost.github.io/stylus/try.html
Stylus is a CSS pre-processor, that runs in node.js or even a web browser.
Utility Stylus files only contain mixins or functions for other Stylus files to import. Utility files should not be compiled down to CSS, to prevent the grunt task `grunt buildStylus` from compiling them, place these files in a "utils" directory. This is an example of the utility directory.
grunt buildStylus. This will place the compiled CSS files directly in the parent css directory
Progressive enhancement - https://github.com/fluid-project/infusion/tree/master/src/framework/enhancement/css
Overview Panel - https://github.com/fluid-project/infusion/tree/master/src/components/overviewPanel/css (relatively difficult involving themes)