Plan step 36 review of 76abdd62. The old view put the filled variant's
16px padding on its own summary and body; the stylesheet matched them as
descendants of any filled collapse, so a plain collapse nested inside
one took the padding too (and an open one turned every nested chevron).
Child combinators now tie each rule to its own <details>. The 12px gap is
a literal like alert.css's, not an average of two spacing tokens.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
