Nebula palette
Butter Dune
From #005054 ink through #007c81, #33979c, #57a5a9 to #73c1c5 light, Butter Dune 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.
cyannebulafive-stop
#005054
#007c81
#33979c
#57a5a9
#73c1c5
The generator opens with #005054 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.