Jewel palette
Mercurial Lighthouse
Five stops tuned to sit together without fighting — #005671 ink anchors the set, #77c8eb opens it up, and #0081a8, #349dc5, #5aabcd cross the middle in a tetradic arrangement. Mercurial Lighthouse suits book covers that read at thumbnail size. The darkest and lightest stops clear AA for large text.
cyanjewelfive-stop
#005671
#0081a8
#349dc5
#5aabcd
#77c8eb
The generator opens with #005671 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.