Put everything into one css file

[su-ex]

Minimize size and unneeded extra connections (loading multiple css files if splitting css but using multiple includes in the html header):
Instead of stylesheet use css_scope in frontmatter and put that as class to body so it can be used in css to scope stuff
Or use some sort of page_name: uri (asdf/basf/bla/) --> page_name (asdf_basf_bla), uri (/) --> (index)