Here is a complete, single-file solution. It combines HTML, CSS, and JavaScript into one document.
This app features:
* Mobile-First Design: Responsive grid layout that looks good on phones and desktops.
* LocalStorage Database: Menu changes are saved instantly to the user's browser.
* Admin Panel: A hidden section to add items or edit prices.
* Interactive: Live search and category filtering.
How to use this:
* Copy the code block below.
* Paste it into a text editor (Notepad, TextEdit, VS Code).
* Save the file as menu.html.
* Open it in your browser.
* Admin Password: admin123
Gourmet Bistro | Digital Menu