Sumi palette
Halcyon Library
From #9f4100 ink through #cd6c3b, #ec8857, #f49d74 to #ffc3a8 light, Halcyon Library is a split-complementary 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 for large text.
orangesumifive-stop
#9f4100
#cd6c3b
#ec8857
#f49d74
#ffc3a8
The generator opens with #9f4100 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.