Retro palette
Indigo Delta
Indigo Delta runs #a04142 through #006d95, #00765e, #be5c5b to #009477 in five measured steps, the tetradic structure keeping every neighbor honest. Reach for it for book covers that read at thumbnail size.
redretrofive-stop
#a04142
#006d95
#00765e
#be5c5b
#009477
The generator opens with #a04142 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.