Theme colours are CSS variables, so Tailwind produced no CSS for /NN modifiers and all tinted backgrounds were missing. Colours now mix the variable with transparent via color-mix() for modifiers only; plain classes keep the bare variable. Aliases for colour names used but never defined (primary, secondary, success, warning, danger, info). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>