To run Librarian locally on a development environment, you'll need:

• PHP 7.4+ (cli is enough for developing with the built-in PHP web server)
• Composer
• NPM (recommended due to Tailwind, but only required if you're modifying templates)

Librarian uses Tailwind css for its front-end, but the main app.css is included in the web public directory to facilitate usage. You are only required to run npm if you make significant changes to the layout, or if you want to include additional CSS in the assets build pipeline.