Semantic
64px · 4em · Outer page gutter — 64/32/24/24 (md/sm/xs/2xs)
64px · 4em · Between columns — mirrors page
64px · 4em · Section vertical, small — 64/32/24/24
96px · 6em · Section vertical, medium — 96/96/64/64
128px · 8em · Section vertical, large — 128 across all
64px · 4em · Inner container — 64/64/24/24
128px · 8em · Nav region — 128/64/24/24
32px · 2em · Card interior — 32/32/24/24
Spacing scale · base unit 4px