Symptom: Opacity modifier ignored on custom color

Root cause#

Custom color defined without alpha-capable format.

The fix#

Define colors as hex/hsl (not pre-baked rgba); the engine converts.

Verify#

  • Hard-refresh (the CSS cache is the #1 false negative)
  • Re-generate and re-link the stylesheet
  • Search the docs for the exact class — spelling is unforgiving

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