The only alternatives I can think of are (1) have the filename of the stylesheet reveal what type of style it is, and (2) stop acting like stylesheets are a bet

The only alternatives I can think of are (1) have the filename of the stylesheet reveal what type of style it is, and (2) stop acting like stylesheets are a better way to factor out UI code than React's JS-based component-oriented styling patterns. I personally do #2 but Pantsuit seems reasonable for sites that are relatively simple content + UI affairs (e.g. Wordpress) without a complex state-space (e.g. a T-shirt designer app).