kmonlineworks/crystal-html-template ? reverse-engineered prompt

Build me a clean, modern multipage website template for a portfolio or video showcase site. I want it to feel polished and easy to edit, with a simple homepage, about page, contact page, portfolio page, all works page, category page, single item page, download page, videos page, and a custom 404 page.

Make it fully responsive and built with HTML, CSS, Bootstrap, and a little JavaScript. The portfolio area should include a carousel, and the design should use Font Awesome icons and placeholder stock images where needed. Keep the sections well organized and easy to swap out, since I may want to reuse it for different projects.

Please make the layout look modern and clean, with smooth spacing and good mobile behavior. If you need to check current Bootstrap or icon docs online, go ahead and do that.