Exportable or Default Theme for Pages Fonts and Colors

I am building a Web App using the Dynamic CMS.  I want every page to follow our brand guide for fonts and color.  That is, I want to apply a theme to each page.

There is no way to do this with Dynamic Templates (or any page for that matter) - You have to literally manually set the fonts and color pallet for every  single template you need. 

All I want is a simple theme(s) that I can save and apply to the page.  I didn't want to have to write the CSS for these pages, but I am guessing I will have to...but of course, I'll have to copy the css to every single template/page if I change it.

Are you feeling me here :)