Add CLAUDE.md with repo guidance for Claude Code

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## What this repo is
+
+Static one-page website for **Marszalek Architekten** (Perchtoldsdorf, Austria). No build system, no framework — the entire site is a single `index.html` served by nginx inside Docker. A 2-page A4 PDF info sheet lives alongside it as a pre-generated static asset.
+
+## Key commands
+
+### Regenerate the PDF
+Requires Node.js and Google Chrome installed locally. Close the PDF in any viewer first (Windows locks open files).
+```
+node generate-pdf.js
+```
+The script uses `puppeteer-core` with the system Chrome at `C:\Program Files\Google\Chrome\Application\chrome.exe`. If Chrome moves, update `executablePath` in `generate-pdf.js`.
+
+### Build and run via Docker
+```
+docker compose up --build -d   # build image and start on port 3080
+docker compose down            # stop
+```
+
+### Install Node deps (only needed to regenerate the PDF locally)
+```
+npm install
+```
+
+## Architecture
+
+```
+index.html                        ← entire website (HTML + CSS + JS, no external assets)
+infosheet-template.html           ← HTML source rendered to PDF by Puppeteer
+generate-pdf.js                   ← Node script: opens template in Chrome → exports A4 PDF
+marszalek-architekten-infosheet.pdf  ← pre-generated output; committed to repo
+nginx.conf                        ← serves index.html + PDF; sets caching & download headers
+Dockerfile                        ← nginx:alpine, copies index.html + PDF + nginx.conf
+docker-compose.yml                ← single service, host port 3080 → container port 80
+```
+
+### PDF workflow
+`infosheet-template.html` is a self-contained 2-page A4 HTML document styled for print (mm units, `print-color-adjust: exact`, `page-break-after: always` between pages). `generate-pdf.js` loads it via a `file:///` URL in headless Chrome, waits 1.5 s for Google Fonts, then calls `page.pdf()`. The output PDF is committed directly — Docker does **not** regenerate it at build time.
+
+### Website structure
+`index.html` is a single-page site with five anchor-linked sections: `#home` (hero), `#projekte` (portfolio grid with JS category filter), `#leistungen` (services), `#ueber-uns` (team), `#kontakt` (contact + download banner). All portfolio images load directly from the original WordPress CDN at `marszalekarchitekten.at`. Google Fonts (Cormorant Garamond + Inter) are loaded from `fonts.googleapis.com`.
+
+### Brand colours
+- Green accent: `#99cc00` (matches original site — used in nav bar and PDF header)
+- Near-black: `#0f0f0f`
+- The green is defined in `index.html` as the nav `background` and hardcoded in `infosheet-template.html` as `--green: #99cc00`.
+
+## Deployment (Portainer)
+Add a stack pointing at `https://git.stranto.com/cgasser/web_marszalekarchitekten`, branch `master`. Portainer pulls the repo and runs `docker compose up`. The site is available on the host at port **3080**.
+
+When content changes: edit `index.html` and/or `infosheet-template.html`, regenerate the PDF locally with `node generate-pdf.js`, commit both, and redeploy the stack in Portainer.