Build a palette.
A palette isn't a set of colours you like — it's a set of roles that hold together.
Pick one hue and the system builds the rest by role: a calm surface, readable ink, a primary, a support, and one accent for the action. Watch it paint a real UI, and check the contrast honestly. Then hit Roll chaos and feel what happens when colour has no system.
One hue in. A whole system out.
Drag the hue, choose how the accent relates, and read the contrast — the numbers that decide if text is legible.
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Drag the hue — everything else derives from it. Then read the contrast below.
The one number that matters: contrast. Body text needs a ratio of 4.5 to pass WCAG AA (7 for AAA). A gorgeous palette whose text fails contrast is a broken palette — that's why the check is live, not an afterthought.