Blue Hour palette
Crisp Cellar
Dark anchor, working middle, light release: #00517b, #007ab7, #3396d5, #58a5db, #74c2f9 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.
skybluehourfive-stop
#00517b
#007ab7
#3396d5
#58a5db
#74c2f9
The generator opens with #00517b as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.