Sumi palette
Tranquil Plaza
From #6e2b00 ink through #a94700, #c7632b, #cf784d to #ee9468 light, Tranquil Plaza is a monochromatic 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.
orangesumifive-stophigh-contrast
#6e2b00
#a94700
#c7632b
#cf784d
#ee9468
The generator opens with #6e2b00 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.