Plan step 36. The rewrite drew the popover's 18rem cap as 288px, and its stylesheet opened with "two lists" before naming three; the headers now say what the rules do. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9