Inconsistent Border Radius

The upstream rule is that one bullet under "Components" (design-rams-shadow-consistency covers its shadow half); the explanation is ours. Radius is a material property: a product where every surface is cut the same way reads as one object, and a card at 4px next to a card at 12px reads as two products glued together. Define radius tokens and hand them out by role — controls one value, containers another, pills fully round — rather than choosing per component.

When one rounded box sits inside another, keep the curves concentric: child radius ≤ parent radius, ideally parent minus the padding (see design-nested-radii).