Load Mobile CSS Only for Mobile, Desktop CSS Only for Desktop

What I said the first time is maybe not a good idea, because of what I said the second time. The main style sheet has no media queries, but the mobile one has lots. My preference is to combine everything into one sheet, but it’s difficult to see the best way without creating too much redundant or over-ridden/conflicting code, those Wordpress sheets are kind of big a lot to take in. Perhaps doing it the other way around, putting the main css in a min-width query would do it, since that has no queries of its own, but I would not like to say. I’m not used to working with Wordpress sheets.