Aurora palette
Halcyon Brook
Halcyon Brook runs #00555a through #008188, #349da4, #59aab0 to #76c7cc in five measured steps, the monochromatic structure keeping every neighbor honest. Reach for it for book covers that read at thumbnail size. The darkest and lightest stops clear AA for large text.
cyanaurorafive-stop
#00555a
#008188
#349da4
#59aab0
#76c7cc
The generator opens with #00555a as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.