Blue Hour palette
Russet Crater
Russet Crater runs #005893 through #0081d4, #349df3, #5cadf6 to #91caff in five measured steps, the tetradic structure keeping every neighbor honest. Reach for it for book covers that read at thumbnail size. The darkest and lightest stops clear AA for large text.
skybluehourfive-stop
#005893
#0081d4
#349df3
#5cadf6
#91caff
The generator opens with #005893 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.