Html Tailwind Guideline: Colors — Theme color variables. Description: Define colors in Tailwind theme and use directly. Do: bg-primary text-success border-cta. Don't: bg-[var(--color-primary)] text-[var(--color-success)]. Good Example: bg-primary. Bad Example: bg-[var(--color-primary)]. Severity: Medium. Docs: https://tailwindcss.com/docs/customizing-colors.