Make the rail header FAB's collapsed shape win by specificity
Plan step 37 review. The collapsed rail FAB's gap and minimum width tied with fab.css's extended-size and collapse-on-scroll rules at three attributes and won only by coming after them. A deduplicating bundle keeps that order (navigation-rail.css imports fab.css), but a build that repeats a shared stylesheet need not: all.css imports fab.css again after the scaffold has reached the rail, and the Workbench's Tailwind entry inlines every occurrence. Doubling [data-md-extended] settles it by specificity, as the flat shadow already was, so the order no longer matters. A scan of every component and layout stylesheet pair for same-layer, same-property ties on a shared hook found no other override that relies on order: the remaining ties are on mutually exclusive elements or sit behind an import edge. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
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Claude Opus 5
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@@ -187,7 +187,7 @@ it('flattens a FAB nested in the rail header and morphs its label', function ()
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expect($css->declarations("[data-md-navigation-rail-header] [data-md-fab] > span:where( [data-md-navigation-rail='collapsed'], [data-md-navigation-rail='collapsed'] *, [data-rail='collapsed'] [data-md-navigation-rail='collapsible']:not([data-md-open]), [data-rail='collapsed'] [data-md-navigation-rail='collapsible']:not([data-md-open]) *, [data-md-navigation-rail='modal']:not([data-md-open]), [data-md-navigation-rail='modal']:not([data-md-open]) * )"))
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->toBe(['max-width' => '0', 'opacity' => '0'])
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->and($css->declarations("[data-md-navigation-rail-header] [data-md-fab][data-md-extended]:where( [data-md-navigation-rail='collapsed'], [data-md-navigation-rail='collapsed'] *, [data-rail='collapsed'] [data-md-navigation-rail='collapsible']:not([data-md-open]), [data-rail='collapsed'] [data-md-navigation-rail='collapsible']:not([data-md-open]) *, [data-md-navigation-rail='modal']:not([data-md-open]), [data-md-navigation-rail='modal']:not([data-md-open]) * )"))
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->and($css->declarations("[data-md-navigation-rail-header] [data-md-fab][data-md-extended][data-md-extended]:where( [data-md-navigation-rail='collapsed'], [data-md-navigation-rail='collapsed'] *, [data-rail='collapsed'] [data-md-navigation-rail='collapsible']:not([data-md-open]), [data-rail='collapsed'] [data-md-navigation-rail='collapsible']:not([data-md-open]) *, [data-md-navigation-rail='modal']:not([data-md-open]), [data-md-navigation-rail='modal']:not([data-md-open]) * )"))
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->toBe(['min-inline-size' => '0', 'aspect-ratio' => '1', 'gap' => '0']);
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});
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