Nuxt Ui Guideline: Components — Use semantic color props. Description: Use semantic colors like primary secondary error. Do: color="primary" color="error". Don't: Hardcoded colors. Good Example: <UButton color="primary">. Bad Example: <UButton class="bg-green-500">. Severity: Medium. Docs: https://ui.nuxt.com/docs/getting-started/theme/design-system.