material-components/material-web ? reverse-engineered prompt

Build me a polished demo site using Material Web components so I can see a real example of a modern Material 3 interface.

I want a clean page with a nice header, a few sections, and a form that shows off common controls like buttons, text fields, checkboxes, radios, selects, tabs, dialogs, chips, and a slider. Make it feel like a real app rather than a component catalog, but it should still be easy to scan and try out the different pieces.

Use the official Material styling and keep it accessible and responsive. Include a simple theme that looks good in light mode, and if it’s easy, make it work well on mobile too. If you need to look up the current docs online, go ahead.

Please wire everything up so I can run it locally and click around right away, with sensible default content and no extra setup.