Shadcn Guideline: Accordion — Choose accordion type. Description: Use type="single" or type="multiple" appropriately. Do: type="single" for one open type="multiple" for many. Don't: Default type without consideration. Good Example: <Accordion type="single" collapsible>. Bad Example: <Accordion> without type. Severity: Low. Docs: https://ui.shadcn.com/docs/components/accordion.