Retro palette
Halcyon Ridge
From #005485 ink through #1f7dbd, #4199db, #62a8e1 to #7ec5ff light, Halcyon Ridge is a tetradic progression that holds together at any size. Use it for event posters that compete with a wall of other posters. The darkest and lightest stops clear AA for large text.
skyretrofive-stop
#005485
#1f7dbd
#4199db
#62a8e1
#7ec5ff
The generator opens with #005485 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.