Building a site with susy sass

Question

I'm looking at using susy sass to build an entire website, as opposed to bootstrap. Am I right in saying that the site has to be built page per pge. I mean if say on the home the aside tag as 3 columns and on the about page the aside tag has 4 columns you'd have to write this style for each page? I don't seem to find good referencws for building a whole site with susy.

Thanks