Petrichor palette
Cardamom Marsh
From #004650 ink through #00717f, #308c9a, #5299a6 to #6eb6c2 light, Cardamom Marsh is a tetradic 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.
cyanpetrichorfive-stophigh-contrast
#004650
#00717f
#308c9a
#5299a6
#6eb6c2
The generator opens with #004650 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.