Background
--background
Foundation
Colors
A strict monochrome palette. No shades of grey, only opacity.
#FFF / #000
Foreground
--foreground
Muted
--muted
Border
--border
Principles
Total Contrast
Either #000 or #FFF. No in-betweens.
Opacity as Color
Greys are just blacks with lower alpha.
No Borders
Layouts defined by space, not lines.