Blue Hour palette
Maple Porch
Dark anchor, working middle, light release: #004373, #006ab2, #2e85d0, #5095d5, #6cb2f3 form a tetradic 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 as a text pair.
skybluehourfive-stophigh-contrast
#004373
#006ab2
#2e85d0
#5095d5
#6cb2f3
The generator opens with #004373 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.