Sumi palette
Copper Atelier
Copper Atelier runs #a1183d through #ce4f65, #ee6c7f, #f48493 to #ffafb6 in five measured steps, the monochromatic structure keeping every neighbor honest. Reach for it for hotel key cards and lobby signage in one system. The darkest and lightest stops clear AA for large text.
redsumifive-stop
#a1183d
#ce4f65
#ee6c7f
#f48493
#ffafb6
The generator opens with #a1183d as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.