Blue Hour palette
Opal Gallery
From #00527e ink through #357bab, #5196c8, #6ca5d0 to #88c2ee light, Opal Gallery is a triadic progression that holds together at any size. Use it for book covers that read at thumbnail size. The darkest and lightest stops clear AA for large text.
skybluehourfive-stop
#00527e
#357bab
#5196c8
#6ca5d0
#88c2ee
The generator opens with #00527e as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.