The theme test now fails on a quarter spacing step, a one-off corner, line height, or tracking, a component naming a scale step, or a role written as a raw color outside the allowed tints, logo, and code hues. To pass it, the one-off line heights become a leading ladder in the theme (tight, snug, normal, relaxed), and the nested corners left as calc() in components become radius tokens. styling.md takes in the rules.