Blue Hour palette
Oyster Delta
Dark anchor, working middle, light release: #006478, #0090ad, #38acca, #61bad3, #7fd7f1 form a triadic 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.
cyanbluehourfive-stop
#006478
#0090ad
#38acca
#61bad3
#7fd7f1
The generator opens with #006478 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.