In an enterprise, you don't build buttons and inputs from scratch every time. You build a **Razor Class Library (RCL)**.
An RCL is a specialized .NET project that can contain .razor files, CSS, Javascript, and static assets. It can be packed into a **NuGet** package and shared across all your company's apps. This ensures a consistent look and feel (your 'Design System') across your whole portfolio.
Blazor supports **CSS Isolation**. You create a MyComponent.razor.css file, and the styles in that file ONLY apply to that component. This prevents 'Global CSS Pollution' and makes your library components much safer to use alongside other libraries.
Q: "Should I wrap MudBlazor or Fluent UI?"
Architect Answer: "YES. Don't build a raw library from scratch. Choose a robust base like **MudBlazor** or **AntDesign Blazor**, and then create your OWN library that wraps their components with your company's styling, specific validation logic, and default properties. This gives you 90% productivity and 100% control over your UI standards."