@../CLAUDE.md

# Paint by Habits

A local-only, single-file HTML habit tracker that reveals a pixel-art image as
daily habits are checked off.

## Project-specific notes

- **This project is not a Rust crate.** The deliverable is a single
  self-contained `index.html` (vanilla JS + CSS, no build step, no external
  requests).
- The authoritative spec is `docs/DESIGN.md`. Behavior changes should update it.
- **Validation:** open `index.html` in a browser from `file://`; there must be
  no console errors, no network requests, and the flows in DESIGN.md §9 (edge
  cases) must hold. A quick static check: `grep` the file for `http://`,
  `https://`, and `fetch(` — external references are forbidden (links in
  comments/About text excepted).
- Deployment: copy `index.html` to any static host. No infra needed.