# AGENTS.md

## Purpose
This project is a small Markdown-to-HTML utility used behind NGINX.
When a `.md` file is requested, `md2html.php` loads the Markdown, converts it with Parsedown, and renders HTML styled by `markdown.css`.

## Key Files
- `md2html.php`: entrypoint for conversion and HTML output.
- `markdown.css`: visual styling for rendered Markdown (`.markdown-body`).
- `composer.json`: PHP dependency config (`erusev/parsedown`).

## Environment Assumptions
- Project root: `D:\www\md2html`
- Markdown files are resolved from `D:\www\...`
- CSS is currently linked as `//localhost/md2html/markdown.css`

## Change Priorities
1. Keep output readable on desktop and mobile.
2. Preserve Markdown semantics generated by Parsedown.
3. Avoid introducing JS unless explicitly required.
4. Keep the utility simple and fast.

## Styling Rules (`markdown.css`)
- Style only inside `.markdown-body` unless there is a strong reason to change global page behavior.
- Must cover: headings, links, lists, blockquotes, inline code, code blocks, tables, images, hr.
- Keep strong contrast and accessible font sizes.
- Ensure long code lines and wide tables remain usable on small screens (`overflow-x`).
- Prefer CSS variables for colors and spacing to simplify future theme changes.

## PHP Rules (`md2html.php`)
- Keep dependency loading via `vendor/autoload.php`.
- Keep response minimal: `<!doctype html>`, UTF-8 meta, stylesheet link, wrapped content.
- Do not remove `.md` extension guard.
- Any path-handling changes must remain compatible with Windows paths.

## Recommended Validation After Edits
1. Open at least one Markdown file with:
   - headings (`#`, `##`, `###`)
   - lists
   - fenced code block
   - table
   - blockquote
   - image
2. Verify layout on desktop and mobile width.
3. Verify links and code blocks remain readable.

## Non-Goals
- Building a full CMS.
- Adding heavy frontend frameworks.
- Replacing Parsedown unless explicitly requested.