Invalid font definitions

!893 (merged) introduced the following lines to at least three CSS files:

@import url("/static/assets/fonts/Atikinson_Hyperlegible_Next/AtkinsonHyperlegibleMono-VariableFont_wght.ttf");
@import url("/static/assets/fonts/Atikinson_Hyperlegible_Next/AtkinsonHyperlegibleNext-VariableFont_wght.ttf");

Firefox does not understand this. @import is only intended to be used to include other stylesheets, not font files. As such, the Crafty interface displays in the default sans-serif font rather than the intended Atkinson Hyperlegible font. @font-face is the proper way to import a font in CSS.