Monochrome palette
Pumice Courtyard
From #004c5a ink through #00778c, #3292a8, #55a0b2 to #72bccf light, Pumice Courtyard is a analogous progression that holds together at any size. Use it for hotel key cards and lobby signage in one system. The darkest and lightest stops clear AA for large text.
cyanmonochromefive-stop
#004c5a
#00778c
#3292a8
#55a0b2
#72bccf
The generator opens with #004c5a as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.