Blue Hour palette
Polar Mill
Dark anchor, working middle, light release: #005891, #1882cd, #3e9eeb, #61aef0, #8fcaff form a complementary blue hour set with somewhere to stand at every lightness. Made for book covers that read at thumbnail size. The darkest and lightest stops clear AA for large text.
skybluehourfive-stop
#005891
#1882cd
#3e9eeb
#61aef0
#8fcaff
The generator opens with #005891 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.