Blue Hour palette
Burnished Fen
Dark anchor, working middle, light release: #a25163, #3273aa, #5d7a2e, #c06c7d, #4e8ec7 form a tetradic blue hour set with somewhere to stand at every lightness. Made for book covers that read at thumbnail size.
skybluehourfive-stop
#a25163
#3273aa
#5d7a2e
#c06c7d
#4e8ec7
The generator opens with #a25163 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.