compiling node modules

ht_booking/README.md

@@ -49,6 +49,30 @@ compilation: debug
 listening on http://localhost:5150
 ```
 
+## Styling (CSS build)
+
+The UI uses Tailwind CSS + daisyUI. Rather than the render-blocking Tailwind
+Play CDN, the stylesheet is compiled ahead of time into a purged, minified
+bundle at `assets/static/css/app.css` (served at `/static/css/app.css`).
+
+One-time setup:
+
+```sh
+npm install
+```
+
+Rebuild the bundle after changing any class names in `assets/views/**/*.html`
+or the theme config:
+
+```sh
+npm run build:css       # one-off, minified
+npm run watch:css       # rebuild on save while developing templates
+```
+
+`assets/static/css/app.css` is committed, so a deploy needs no Node step — but
+remember to rebuild and commit it whenever the templates change. The Tailwind
+source lives in `assets/css/tailwind.css`; theme config is `tailwind.config.js`.
+
 ## Full Stack Serving
 
 You can check your [configuration](config/development.yaml) to pick either frontend setup or server-side rendered template, and activate the relevant configuration sections.