Blue Hour palette
Cobalt Grove
Five blue hour stops with room to breathe — #004a62 grounds, #007497 and #318fb3 do the talking, #549dbc softens, #70bada lifts. The analogous bones keep it coherent across book covers that read at thumbnail size. The darkest and lightest stops clear AA as a text pair.
cyanbluehourfive-stophigh-contrast
#004a62
#007497
#318fb3
#549dbc
#70bada
The generator opens with #004a62 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.