Industrial palette
Spruce Square
Five industrial stops with room to breathe — #00535e grounds, #007e8f and #3399ab do the talking, #58a7b6 softens, #75c4d3 lifts. The tetradic bones keep it coherent across book covers that read at thumbnail size. The darkest and lightest stops clear AA for large text.
cyanindustrialfive-stop
#00535e
#007e8f
#3399ab
#58a7b6
#75c4d3
The generator opens with #00535e as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.