powerbuoy/sleek-ui ? reverse-engineered prompt

Build me a lightweight UI library for common web interface elements, with clean styles and a little JavaScript for simple interactions.

I want it to feel polished and easy to drop into a project, with reusable components like buttons, forms, alerts, modals, menus, and other basic UI pieces that most sites need. Keep the styling flexible and easy to customize with Sass, and make the JavaScript small and straightforward so the components work without a lot of setup.

Please also include a simple docs area or example page that shows how to use the components, so someone can quickly see what each piece does and copy the basic usage into their own app. If you need to check current best practices or docs while building it, go ahead and look them up.