Plan step 36 ("Interaction is the shared classes", the user, 2026-09-14).
A segment's hover and press opacities were group.css's own copy of
md-state-layer's declarations; the label now renders md-state-layer
(and, below medium's two smallest sizes, md-touch-target) and the
stylesheet keeps only what the class cannot draw: focus and disabled read
off the real radio or checkbox inside with :has(), not the label itself,
so the focus ring's layer tint and the disabled hide are kept as a
refinement (the latter a real gap the old rule left open). button-group.css,
which only shapes corners and spacing, needed no change.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
