Elevation

Shadow scale
Two families: bas- (pure shadow) and out- (shadow + 1px hairline ring). Five levels: sm · md · lg · dif (diffuse) · scr (screen / modal).
Base — soft shadow, no ring

sm

--shadow-bas-sm

md

--shadow-bas-md

lg

--shadow-bas-lg

dif

--shadow-bas-dif

scr

--shadow-bas-scr

Outlined — shadow + 1px hairline ring

sm

--shadow-out-sm

md

--shadow-out-md

lg

--shadow-out-lg

dif

--shadow-out-dif

scr

--shadow-out-scr