diff --git a/php-transformer/src/HtmlToBlocks/HtmlTransformer.php b/php-transformer/src/HtmlToBlocks/HtmlTransformer.php
index b71aaec4..d5ab581c 100644
--- a/php-transformer/src/HtmlToBlocks/HtmlTransformer.php
+++ b/php-transformer/src/HtmlToBlocks/HtmlTransformer.php
@@ -1090,7 +1090,15 @@ private function rewriteAuthorSelectorPrelude(string $prelude, bool $controlWrap
             }
             $matches = $this->matchingAuthorSourceElements($parsed);
             if ( array() === $matches ) {
-                $rewritten[] = $selector;
+                // A type selector (e.g. `.page-header p`) that matches no source
+                // element must still be projected through its source-tag marker
+                // rather than emitted bare. Otherwise a `<div>` later collapsed to a
+                // `<p>` (an eyebrow `<div class="label">`) would be newly captured by
+                // the dormant `.page-header p` rule and lose its own type scale.
+                // Rewriting to `:where(.source-p-marker)` — carried only by elements
+                // that were `<p>` in the source — makes the rule match exactly what
+                // the author intended and nothing that was structurally promoted.
+                $rewritten[] = $this->rewriteSourceTagTypes($selector, $parsed);
                 continue;
             }
             if ( $this->isRootChildSelector($parsed) ) {
@@ -3754,6 +3762,12 @@ private function visualTextWrapperBlockFromElement(DOMElement $element): ?array
         // decoration, which the wrapper class still applies to the paragraph. Real
         // flex containers hold child elements and are already excluded above by the
         // `childElementCount === 0` guard (e.g. `.tier-price` wrapping a `<span>`).
+        //
+        // Descendant paragraph rules the source used a non-`p` tag to escape (e.g.
+        // `.page-header p { font-size: ... }` styling body copy while an eyebrow
+        // authored as `<div class="label">` avoided it) do not capture the collapsed
+        // paragraph: author `p` type selectors are projected through the source-`p`
+        // tag marker, which only elements that were `<p>` in the source carry.
         if ( 0 === $this->childElementCount($element) && ! $this->hasBoxChromeWrapperStyling($element) ) {
             return $this->createBlock(
                 'core/paragraph',
diff --git a/php-transformer/src/HtmlToBlocks/Patterns/NavigationPattern.php b/php-transformer/src/HtmlToBlocks/Patterns/NavigationPattern.php
index 40554e00..38b30114 100644
--- a/php-transformer/src/HtmlToBlocks/Patterns/NavigationPattern.php
+++ b/php-transformer/src/HtmlToBlocks/Patterns/NavigationPattern.php
@@ -30,6 +30,16 @@ public function match(DOMElement $element, PatternContext $context): ?array
             return null;
         }
 
+        // A row of button-styled links (e.g. `<div class="stream-links"><a
+        // class="stream-btn">…</a>…</div>`) is a call-to-action button group, not
+        // site navigation. It matched here only because a container token like
+        // `links` looks navigational, but its anchors carry button signals and
+        // belong to the buttons pattern, which preserves their pill geometry and
+        // styling. Defer so navigation does not flatten them into menu items.
+        if ( 'nav' !== strtolower($element->tagName) && ! $this->hasDirectListNavigationSignal($element) && $this->hasButtonStyledLinkChildren($element) ) {
+            return null;
+        }
+
         if ( $this->hasDirectBrandingAnchorBesideListNavigation($element, $innerHtml) ) {
             return null;
         }
@@ -846,6 +856,34 @@ private function collectAnchorsExcluding(DOMElement $element, array &$anchors, a
         }
     }
 
+    /**
+     * Whether the container's direct link children are button-styled call-to-
+     * action anchors rather than navigation links. Requires every direct anchor
+     * to carry a button signal so a genuine nav menu with one incidental
+     * button-classed link is not misclassified.
+     */
+    private function hasButtonStyledLinkChildren(DOMElement $element): bool
+    {
+        $classifier = new ButtonSignalClassifier();
+        $anchors = array();
+        foreach ( $element->childNodes as $child ) {
+            if ( $child instanceof DOMElement && 'a' === strtolower($child->tagName) ) {
+                $anchors[] = $child;
+            }
+        }
+        if ( 2 > count($anchors) ) {
+            return false;
+        }
+
+        foreach ( $anchors as $anchor ) {
+            if ( ! $classifier->hasTransformSignal($anchor) ) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
     private function hasNavigationSignal(DOMElement $element): bool
     {
         if ( 'navigation' === strtolower($element->hasAttribute('role') ? $element->getAttribute('role') : '') ) {
diff --git a/php-transformer/tests/contract/run.php b/php-transformer/tests/contract/run.php
index d8e9af14..d674a498 100644
--- a/php-transformer/tests/contract/run.php
+++ b/php-transformer/tests/contract/run.php
@@ -322,6 +322,16 @@ public function match(DOMElement $element, PatternContext $context): ?array
 $assert('About' === ($navigationBlock['innerBlocks'][0]['attrs']['label'] ?? null), 'navigation conversion still preserves link labels');
 $assert('/about' === ($navigationBlock['innerBlocks'][0]['attrs']['url'] ?? null), 'navigation conversion still preserves link URLs');
 
+// A row of button-styled links whose container merely carries a `links` token is
+// a call-to-action button group, not site navigation. It must convert to
+// core/buttons (preserving pill geometry) instead of being flattened into a
+// core/navigation menu of half-height text links.
+$ctaLinkRowResult = ( new HtmlTransformer() )->transform('<div class="stream-links"><a class="stream-btn" href="#">Spotify</a><a class="stream-btn" href="#">Bandcamp</a><a class="stream-btn" href="#">Apple Music</a></div>')->toArray();
+$ctaSerialized = (string) ($ctaLinkRowResult['serialized_blocks'] ?? '');
+$assert(str_contains($ctaSerialized, '<!-- wp:buttons'), 'button-styled link row converts to core/buttons instead of navigation');
+$assert(! str_contains($ctaSerialized, '<!-- wp:navigation'), 'button-styled link row is not misclassified as core/navigation');
+$assert(str_contains($ctaSerialized, 'stream-links'), 'the converted button group preserves the container class');
+
 $accordionResult = ( new HtmlTransformer() )->transform('<section class="faq"><div class="faq-item active"><button class="faq-question" aria-expanded="true" aria-controls="answer-a">What is covered?</button><div id="answer-a" class="faq-answer"><p>Assessment and treatment planning.</p></div></div><div class="faq-item"><button class="faq-question" aria-expanded="false" aria-controls="answer-b">How long is a visit?</button><div id="answer-b" class="faq-answer"><p>Most visits take 45 minutes.</p></div></div></section>')->toArray();
 $accordionBlock = $accordionResult['blocks'][0] ?? array();
 $accordionItems = $accordionBlock['innerBlocks'] ?? array();
diff --git a/php-transformer/tests/unit/artifact-author-stylesheet-projection.php b/php-transformer/tests/unit/artifact-author-stylesheet-projection.php
index 19fe5ca7..31f1399a 100644
--- a/php-transformer/tests/unit/artifact-author-stylesheet-projection.php
+++ b/php-transformer/tests/unit/artifact-author-stylesheet-projection.php
@@ -117,6 +117,26 @@
 $assert(1 === count($multiPageAuthorAssets), 'identical generated author stylesheets are emitted once across HTML routes');
 $assert('blocks-engine/wordpress-site-plan/v2' === ($multiPage['source_reports']['wordpress_site_plan']['schema'] ?? null), 'deduplicated multi-route assets produce a canonical WordPress site plan');
 
+// Collapsed-paragraph cascade isolation via the source-`p` tag marker. A shared
+// stylesheet carries a descendant-`p` body-copy rule (`.page-header p`) and an
+// eyebrow (`.label`) that collapses to a paragraph. The projected `.page-header
+// p` rule must target the source-`p` marker — carried only by elements that were
+// `<p>` in the source — so it styles the real intro paragraph but never captures
+// the collapsed eyebrow, which keeps its own class-owned type scale. No bare
+// `.page-header p` may survive to capture the promoted paragraph.
+$collapse = ( new ArtifactCompiler() )->compile(array(
+    'entrypoint' => 'index.html',
+    'files' => array(
+        array( 'path' => 'index.html', 'kind' => 'html', 'content' => '<link rel="stylesheet" href="shared.css"><header class="page-header"><div class="label">Home Eyebrow</div><h1>Home</h1><p>Home intro copy.</p></header>' ),
+        array( 'path' => 'about.html', 'kind' => 'html', 'content' => '<link rel="stylesheet" href="shared.css"><header class="page-header"><div class="label">About Eyebrow</div><h1>About</h1><p>About intro copy.</p></header>' ),
+        array( 'path' => 'shared.css', 'kind' => 'css', 'content' => '*,*::before,*::after{margin:0;padding:0}.label{display:inline-flex;gap:.5rem;font-size:.68rem;letter-spacing:.2em;text-transform:uppercase}.page-header p{font-size:1.2rem;font-style:italic}' ),
+    ),
+) )->toArray();
+$collapseCss = implode("\n", array_map(static fn (array $asset): string => (string) ($asset['content'] ?? ''), array_values(array_filter($collapse['assets'] ?? array(), static fn (array $asset): bool => 'css' === ($asset['kind'] ?? '') && str_contains((string) ($asset['content'] ?? ''), 'page-header')))));
+$assert(str_contains($collapseCss, 'font-size:.68rem'), 'collapsed eyebrow keeps its own class-owned font-size rule');
+$assert(! preg_match('/(?:^|[\s>~+])\.page-header p\s*\{/', $collapseCss), 'no bare .page-header p rule survives to capture the collapsed eyebrow');
+$assert(preg_match('/\.page-header\s+:where\(\.blocks-engine-source-p-[a-f0-9]+-\d+\)/', $collapseCss) === 1, 'descendant .page-header p is projected through the source-p tag marker so it matches only real source paragraphs');
+
 if ( $failures > 0 ) {
     exit(1);
 }