Blue Hour palette
Evening Bluff
From #004370 ink through #1e6ba6, #3d86c3, #5a95ca to #75b2e8 light, Evening Bluff is a triadic progression that holds together at any size. Use it for book covers that read at thumbnail size. The darkest and lightest stops clear AA as a text pair.
skybluehourfive-stophigh-contrast
#004370
#1e6ba6
#3d86c3
#5a95ca
#75b2e8
The generator opens with #004370 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.