Standard ease
cubic-bezier(0.2, 0, 0, 1)
One curve for the entire system. No bounces, no springs.
Durations
140 · 240 · 420 ms
140 · micro
240 · default
420 · layout
Fades and tonal shifts only.
Entrance
Fade + 4px translate-up
§ 1
§ 2
§ 3
Staggered. Never scale. Never off-screen.
Press
1px translateY, no scale
Fill darkens one step on press.
Focus
2px ring · 3px offset
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Secondary brown at 40% opacity. Never a solid border.
Tonal shift
Background tier, not shadow
Depth is a paper tier. Elevation is never a box-shadow first.