Custom CSS isn't applied to my Discourse

That would be ideal, but I arrived at the current setup because multiple color schemes wouldn’t work for me. Some color schemes produce poor colors for auto-generated variables like --primary-low. Simply redefining the variable may work for one color scheme, but not another. A more general solution is possible if we redefine it based off $primary, or conditionally based on color scheme id/name, but without either multiple themes is necessary, so I can have a per-theme color_definitions.scss (the duplication I’d like to avoid). Or is there a better option I’m missing?