# Design detector

Deterministic linter for AI-generated front-end design tells (gray-on-color, low contrast, side-stripe borders, bounce/elastic easing, gradient text, overused fonts, ghost-card shadows, over-rounding, …) plus design-system drift against our `DESIGN.md`.

Vendored from **[Impeccable](https://github.com/pbakaus/impeccable)** by Paul Bakaus, Apache-2.0 (SPDX headers preserved in source). This is the detector engine only — the upstream skill/command workflow is **not** vendored. Our adapted design guidance lives in the `frontend-design` skill (`.polytoken/skills/frontend-design/`) and Confluence (space PM, *Front-end design guidance*).

## Usage

```sh
# Static scan of our CSS (plain Node, no browser)
node tools/design-detector/detect.mjs --json assets/styling/

# Scan a rendered route (drives a real browser; needs `just serve` running)
node tools/design-detector/detect.mjs --json http://localhost:8080
```

Exit code `0` = clean, `2` = findings. JSON entries carry `antipattern`, `severity` (advisory/warning), `file`, `line`, `snippet`.

## Coverage notes

- Scans **CSS and rendered HTML** — it does **not** parse `.rs` RSX. Treat a clean CSS scan plus a rendered-route scan as the coverage; rely on the `frontend-design` skill checklist for RSX-level structure.
- `design-system-*` findings (radius/color outside our scale) are powered by the token frontmatter in repo-root `DESIGN.md`. Keep `DESIGN.md` in sync with `assets/styling/theme.css` for those checks to stay meaningful.
- Scratch/config (`.impeccable/`) is gitignored.

## Updating

Re-vendor from upstream by copying `skill/scripts/detector/`, `skill/scripts/lib/`, `skill/scripts/context.mjs`, and `skill/scripts/detect.mjs` (the detector's transitive closure) over this directory. Don't hand-edit the engine.