LeetCodeAnimation is a documentation and indexing repository that catalogs 256 LeetCode algorithm problems with animated explanations, multi-language reference solutions (Java, C++, Python), and structured metadata. The actual content lives on the companion site algomooc.com; this GitHub repo serves as a versioned public index, historical asset archive, and synchronization layer. The architecture is a static site generator pipeline: a Node.js sync script (tools/scripts/sync-algomooc-index.js) reads the website's study_index.js, compares it against docs/data/manifest.json, and regenerates manifest.json, leetcode-animation-index.md, index-by-topic.md, and sync-log.md. A separate build-readme.js injects problem counts into the README and produces stats.json for dynamic badges. The Python anima CLI (tools/anima.py) scaffolds new problem directories with template Markdown. GitHub Actions CI validates manifest integrity and checks staleness of generated files on every push/PR. The codebase is well-structured with clear separation between generated artifacts and hand-maintained content, enforced through LCA-AUTOGEN markers in the README. The 256 problems span arrays, linked lists, trees, DP, graphs, and more, each with articles, animations (GIF/MP4), and reference code.