Acid palette
Pale Outpost
Five stops tuned to sit together without fighting — #3b83b1 ink anchors the set, #40aa98 opens it up, and #008b9c, #188e7d, #37a7b8 cross the middle in a tetradic arrangement. Pale Outpost suits book covers that read at thumbnail size.
skyacidfive-stop
#3b83b1
#008b9c
#188e7d
#37a7b8
#40aa98
The generator opens with #3b83b1 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.