Sumi palette
Polar Prairie
Dark anchor, working middle, light release: #cd552f, #0084d9, #00938b, #ec714c, #00b2a8 form a triadic sumi set with somewhere to stand at every lightness. Made for book covers that read at thumbnail size.
redsumifive-stop
#cd552f
#0084d9
#00938b
#ec714c
#00b2a8
The generator opens with #cd552f as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.