The US federal government's design system: Public Sans typography, a token architecture of color 'grades' where the numeric distance between grades guarantees WCAG contrast, a #005ea2 primary blue, the #2491ff vivid focus ring, and sturdy, benefit-of-the-doubt components (banners, identifiers, step indicators) built for gov.gov trust.
Primary actionThe color-grade system itself: every color has a 0–90 grade, and a difference of 40+ between two grades mathematically guarantees WCAG AA contrast — designers pick grades, not hexes, and accessibility follows.