Shadcn Guideline: Components — Prefer compound components. Description: Use provided sub-components for complex UI. Do: Card + CardHeader + CardContent pattern. Don't: Single component with many props. Good Example: <Card><CardHeader><CardTitle>. Bad Example: <Card title="x" content="y" footer="z">. Severity: Medium. Docs: https://ui.shadcn.com/docs/components/card.