Nuxt Ui Guideline: Customization — Use ui prop for component styling. Description: Override component styles via ui prop. Do: ui prop with slot class overrides. Don't: Global CSS overrides. Good Example: <UButton :ui="{ base: 'rounded-full' }"/>. Bad Example: <UButton class="!rounded-full"/>. Severity: Medium. Docs: https://ui.nuxt.com/docs/getting-started/theme/components.