Nuxt Ui Guideline: Customization — Configure default variants in nuxt.config. Description: Set default color and size for all components. Do: theme.defaultVariants in ui config. Don't: Repeat props on every component. Good Example: ui: { theme: { defaultVariants: { color: 'neutral' } } }. Bad Example: <UButton color="neutral"> everywhere. Severity: Medium. Docs: https://ui.nuxt.com/docs/getting-started/installation/nuxt.