Blue Hour palette
Birch Delta
Dark anchor, working middle, light release: #004591, #306ec0, #4b8ade, #659ae3, #82b7ff form a tetradic blue hour set with somewhere to stand at every lightness. Made for packaging that photographs well under harsh retail light. The darkest and lightest stops clear AA for large text.
skybluehourfive-stop
#004591
#306ec0
#4b8ade
#659ae3
#82b7ff
The generator opens with #004591 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.