Plan step 36, navigation review. navigation-rail.css claimed each FAB override beats fab.css by specificity alone; the collapsed FAB's gap and minimum width tie with fab.css's extended-size rules and win by order, which the file's own import of fab.css guarantees. The rail view pointed at one file for the collapsed conditions that four files write out. UPGRADE.md now says applications lose the `rail-collapsed:` variant the development skill used to teach. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9