Monochrome palette
River Ridge
From #004673 ink through #1d6eaa, #3d89c7, #5b98ce to #76b5ec light, River Ridge 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 as a text pair.
skymonochromefive-stophigh-contrast
#004673
#1d6eaa
#3d89c7
#5b98ce
#76b5ec
The generator opens with #004673 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.