Monochrome palette
Indigo Mill
Five monochrome stops with room to breathe — #006368 grounds, #009097 and #38acb3 do the talking, #60b9bf softens, #7ed7dc lifts. The triadic bones keep it coherent across book covers that read at thumbnail size. The darkest and lightest stops clear AA for large text.
cyanmonochromefive-stop
#006368
#009097
#38acb3
#60b9bf
#7ed7dc
The generator opens with #006368 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.