I was using Less CSS but it creates too much duplication. Each HTML page I have includes 3 different stylesheets; two are common to all the pages (IE-support and 960 grid system) and the third stylesheet is a custom one made for that page. With Less CSS it was duplicating all the CSS code from the 960 grid system into the third stylesheet.
All I need are variables and functions/mixins/classes...basically a way to put duplicate CSS code in multiple spots.