Blue Hour palette
River Chapel
Five stops tuned to sit together without fighting — #005572 ink anchors the set, #7bc6ea opens it up, and #177fa7, #3d9bc4, #5fa9cc cross the middle in a tetradic arrangement. River Chapel suits book covers that read at thumbnail size. The darkest and lightest stops clear AA for large text.
cyanbluehourfive-stop
#005572
#177fa7
#3d9bc4
#5fa9cc
#7bc6ea
The generator opens with #005572 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.