Reading ink — measured on white

Secondary ink is where a page goes washed out. 4.93:1 clears AA and nothing else; on the sunken surface it drops to 4.6:1. The current value has headroom at --size-small, which is where secondary text actually lives.

Weight is an accessibility property

• Body is --weight-body (450), not 400: N&M Text's Regular renders grey rather than black at 16px.
• Greyscale antialiasing is dark-mode only — forcing it globally strips a quarter-step of apparent weight from every glyph.
• Nothing below 400 is ever set at reading size. The 200/300 cuts exist for display only.
• Inline <strong> is 600, not 700: against Book, Bold is a shout.

Measure, leading, zoom

• Reading copy caps at --measure-prose (68ch). Past ~80 characters the eye loses the line return.
• Body leading is 1.65 — WCAG 1.4.12 wants at least 1.5 to survive user text-spacing overrides.
• Every size is rem. One px font-size anywhere and browser zoom stops working for that text.
• Only two sizes clamp (display and mega). A paragraph that scales with the viewport is a paragraph that ignores the reader's setting.
• Uppercase + tracking is for labels of two or three words. A tracked uppercase sentence is measurably slower to read.

Effects may never be the only signal

• Every effect's final state is the correct rendering, so prefers-reduced-motion flattening leaves a drawn highlight rather than an invisible one.
• Nothing loops in reading copy. The one infinite effect (the kinetic strip) is aria-hidden and carries no information.
• Hover-only content repeats what is already at its destination.