Sumi palette
Distant Delta
From #7d2124 ink through #a94e4c, #c76966, #d07e7a to #ee9a95 light, Distant Delta is a tetradic progression that holds together at any size. Use it for hotel key cards and lobby signage in one system. The darkest and lightest stops clear AA as a text pair.
redsumifive-stophigh-contrast
#7d2124
#a94e4c
#c76966
#d07e7a
#ee9a95
The generator opens with #7d2124 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.