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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.
+
+## Project Overview
+
+Mosis Designer is a Windows desktop application for previewing RML/RCSS files using the RmlUi library. It provides live reloading when files change in the assets directory.
+
+## Build Commands
+
+```bash
+# Configure the build (requires vcpkg for glfw3 and freetype)
+cmake -B build
+
+# Build debug
+cmake --build build --config Debug
+
+# Build release
+cmake --build build --config Release
+
+# Build with parallel jobs
+cmake --build build --parallel 4
+```
+
+## Running the Application
+
+```bash
+# Run with an RML file
+./build/Debug/mosis-designer.exe assets/demo.rml
+```
+
+The application watches the parent directory of the loaded file for changes and automatically reloads.
+
+## Architecture
+
+Single-file C++23 application (`main.cpp`) that:
+- Uses RmlUi for rendering HTML/CSS-like markup (RML/RCSS)
+- Uses GLFW + OpenGL 3 backend from RmlUi
+- Windows-specific file watching via `FindFirstChangeNotification`
+- Automatically loads all `.ttf` fonts from the RML file's directory
+
+## Dependencies
+
+- **RmlUi**: Fetched via CMake FetchContent from GitHub
+- **GLFW3**: Via vcpkg
+- **FreeType**: Via vcpkg
+
+## Code Style
+
+- C++23 standard
+- 4 spaces indentation
+- snake_case for variables, camelCase for functions/classes
+- UPPER_CASE for constants and enums
+- Early returns preferred over nested conditionals
+- Smart pointers over raw pointers