Blue Hour palette
Luminous Gazebo
Five stops tuned to sit together without fighting — #00475c ink anchors the set, #6fb6d2 opens it up, and #007190, #308cac, #539ab5 cross the middle in a split-complementary arrangement. Luminous Gazebo suits book covers that read at thumbnail size. The darkest and lightest stops clear AA as a text pair.
cyanbluehourfive-stophigh-contrast
#00475c
#007190
#308cac
#539ab5
#6fb6d2
The generator opens with #00475c as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.