Consistent chromatic language reduces cognitive load: primary actions read as primary, warnings demand attention, neutrals recede. Arbitrary palette shifts erode trust because the UI feels unmaintained.
Systems over one-offs
We tie color tokens to semantic roles — surface, emphasis, danger — and validate contrast under accessibility thresholds across themes.
Brand versus usability
Brand palettes still honor readability and error visibility. Design systems negotiate between marketing preference and measurable comprehension.