Disco palette
Pine Alley
From #004575 ink through #006db4, #2f89d2, #5298d7 to #6eb5f5 light, Pine Alley is a analogous progression that holds together at any size. Use it for book covers that read at thumbnail size. The darkest and lightest stops clear AA as a text pair.
skydiscofive-stophigh-contrast
#004575
#006db4
#2f89d2
#5298d7
#6eb5f5
The generator opens with #004575 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.