Space — 4px base × 1 density

--space-1 4px--space-2 8px--space-3 12px--space-4 16px--space-5 20px--space-6 24px--space-8 32px--space-10 40px--space-12 48px--space-16 64px--space-20 80px--space-24 96px--space-32 128px

Control heights — buttons, inputs and selects share these

--control-h-xs 24px--control-h-sm 30px--control-h-md 36px--control-h-lg 44px--control-h-xl 52px

Radius

2px4px6px10px

Elevation — soft, low alpha, large blur

smmdlg

Section rhythm

.section80px block padding — the default .section-tight48px .section-loose96px .containermax 1280px, 24px inline padding

Whitespace is the primary design element here. Reach for a larger space step before reaching for a divider — .hr exists but this system prefers air.