Sumi palette
Mineral Mesa
Five sumi stops with room to breathe — #a01700 grounds, #bb2e18 and #007788 do the talking, #db4e37 softens, #0094a9 lifts. The triadic bones keep it coherent across book covers that read at thumbnail size.
redsumifive-stop
#a01700
#bb2e18
#007788
#db4e37
#0094a9
The generator opens with #a01700 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.