Blue Hour palette
Halcyon Cellar
From #005c8d ink through #1f86c5, #43a2e3, #65b1e9 to #8cceff light, Halcyon Cellar is a tetradic progression that holds together at any size. Use it for museum exhibition graphics with long sightlines. The darkest and lightest stops clear AA for large text.
skybluehourfive-stop
#005c8d
#1f86c5
#43a2e3
#65b1e9
#8cceff
The generator opens with #005c8d as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.