Blue Hour palette
Obsidian Plaza
From #a63c4b ink through #2465b3, #3e7612, #c45764 to #4080d1 light, Obsidian Plaza is a tetradic progression that holds together at any size. Use it for hotel key cards and lobby signage in one system.
redbluehourfive-stop
#a63c4b
#2465b3
#3e7612
#c45764
#4080d1
The generator opens with #a63c4b as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.