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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
+
+Lutris Year in Review is a Python script that generates a static HTML playtime report from a Lutris gaming platform SQLite database. The report displays game playtime statistics with interactive Chart.js visualizations.
+
+## Commands
+
+Generate report with defaults:
+```bash
+python generate_report.py
+```
+
+Generate report with custom options:
+```bash
+python generate_report.py --db pga.db --output report.html --top 10 --background background.png
+```
+
+## Architecture
+
+**Single-file generator (`generate_report.py`):**
+- Reads Lutris SQLite database (`pga.db`) containing games, categories, and playtime data
+- Embeds all data (games JSON, background image as base64) directly into a self-contained HTML file
+- HTML template with Chart.js doughnut chart and dynamic JavaScript filtering is embedded as a string constant (`HTML_TEMPLATE`)
+
+**Database schema (`schema.py`):**
+- Reference file documenting Lutris database structure
+- Key tables: `games` (with `playtime`, `service` fields), `categories`, `games_categories` (many-to-many join)
+
+**Generated output (`report.html`):**
+- Fully static, can be hosted on any web server
+- Client-side filtering by service (Steam, GOG, itch.io, local)
+- Expandable "Others" row in games table
+- Light/dark mode support via CSS `prefers-color-scheme`
+
+## Key Data Relationships
+
+- Games have a `service` field (steam, gog, itchio, humblebundle, or NULL for local)
+- Games link to categories via `games_categories` join table
+- Categories like `.hidden`, `favorite`, `Horny` are filtered out in the report
+- `playtime` is cumulative hours (REAL), not per-session data