Sumi palette
Sleepy Pagoda
Five sumi stops with room to breathe — #902a39 grounds, #a7404c and #007778 do the talking, #c55b65 softens, #009496 lifts. The tetradic bones keep it coherent across book covers that read at thumbnail size.
redsumifive-stop
#902a39
#a7404c
#007778
#c55b65
#009496
The generator opens with #902a39 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.