Monochrome palette
Iris Lighthouse
From #006378 ink through #008fac, #38abc9, #61b9d2 to #7ed6f0 light, Iris Lighthouse 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
#006378
#008fac
#38abc9
#61b9d2
#7ed6f0
The generator opens with #006378 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.