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+# toml++ Documentation Setup `website/tomlplusplus/`
+
+> **Location**: `website/tomlplusplus/`  
+> **Tools**: Poxy, Doxygen, m.css  
+> **Output**: API documentation HTML
+> **Latest Version**: 0.0.5-1
+
+---
+
+## Overview
+
+This directory contains configuration for building the toml++ API documentation using Poxy (a Doxygen + m.css wrapper).
+
+---
+
+## Quick Start
+
+### Install Dependencies
+
+```bash
+npm run setup:doxygen
+```
+
+This installs:
+- **Doxygen** (via Homebrew on macOS, apt on Linux)
+- **Poxy** (via pipx)
+
+### Build Documentation
+
+```bash
+npm run build:tomlplusplus
+```
+
+### Full Site Build
+
+```bash
+npm run build  # Includes toml++ docs
+```
+
+---
+
+## Manual Setup
+
+### macOS
+
+```bash
+brew install doxygen pipx
+pipx install poxy
+```
+
+### Linux
+
+```bash
+sudo apt-get install doxygen python3-pip
+python3 -m pip install --user pipx
+pipx install poxy
+```
+
+---
+
+## Configuration
+
+Documentation is configured via `poxy.toml`:
+
+| Setting | Value |
+|---------|-------|
+| Source paths | `../../tomlplusplus/include` |
+| Pages | `pages/` directory |
+| Images | `images/` directory |
+| Theme | Dark (default) |
+| Output | `html/` directory |
+
+---
+
+## Directory Structure
+
+```
+website/tomlplusplus/
+├── poxy.toml          # Poxy configuration
+├── pages/             # Documentation pages (Markdown)
+│   └── main_page.md
+├── images/            # Badges, logos, graphics
+└── html/              # Generated output (after build)
+```
+
+---
+
+## Build Process
+
+1. **Poxy** reads `poxy.toml`
+2. **Doxygen** parses C++ headers
+3. **m.css** generates styled HTML
+4. Output copied to `_site/tomlplusplus/` during site build
+
+---
+
+## Troubleshooting
+
+### ModuleNotFoundError: jinja2
+
+Install to Homebrew Python:
+
+```bash
+/opt/homebrew/bin/python3 -m pip install --break-system-packages jinja2 Pygments
+```
+
+### Doxygen Warnings
+
+Minor warnings about unresolved links are normal and don't prevent generation.
+
+---
+
+## Related Documentation
+
+- [toml++](./tomlplusplus.md) — Library documentation
+- [Workflows](./workflows.md) — CI builds documentation
+
+---
+
+## External Links
+
+- [Poxy Documentation](https://github.com/marzer/poxy)
+- [Doxygen Manual](https://www.doxygen.nl/manual/)
+- [m.css](https://mcss.mosra.cz/)