halfmoonui/halfmoon ? reverse-engineered prompt

Build me a responsive website starter using Halfmoon as the main UI style, so it feels like a clean Bootstrap replacement with modern themes and dark mode built in.

I want a simple demo site that shows off the basics, like a navbar, hero section, cards, buttons, forms, alerts, and a dashboard style layout. Make it look polished on desktop and mobile, and include an easy way to switch between the built in themes and dark mode. Since Halfmoon does not ship its own JavaScript, keep the code focused on the CSS side and use the normal Bootstrap bundle for any interactive parts.

Please set it up so I can drop the CSS into a normal project and have it work right away. If you need anything from the latest docs, look it up online. Also make sure the page feels like a real product demo, not just a generic bootstrap clone.