CLAUDE.md Starter For A Small Demo Project

# Project preferences

## Stack
- For small demos, prefer plain HTML, CSS and vanilla JavaScript.
- No frameworks like React or Vue unless I ask for one.
- No build step. What we write is what the browser receives.

## Structure
- Keep a clean folder structure: separate folders for styles, scripts and images.
- Name the entry file index.html.

## Code style
- Semantic HTML. Use header, nav and article rather than divs everywhere.
- Mobile-first CSS. Get the phone screen right, then scale up.
- Write code I can read. Favour the obvious version over the clever one.

## Before you start
- Read the existing files before planning any change.
- Tell me the plan in plain words before you write anything.

## When you finish
- Tell me which files you changed and what each change does.