Give the header scrolled colours and equal card heights in 1.11.1

Cards, quotes and call-to-action bands side by side in a row are equal in
height again: the stacking margin meant for a column no longer applies inside
a row. The header can carry a second set of colours for the scrolled page,
the Flatsome transparent header: a "scrolled" state next to "hover", limited
to colours, shadow and opacity, marked by a small script only where it is
used, plus a setting that lets the header float over the first section.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

src/Controller/PageController.php

@@ -80,6 +80,9 @@ final class PageController extends AbstractController
         $documents = [$page['document'], ...array_values($areas), ...array_values($sections)];
         $needsSlider = (bool) array_filter($documents, fn (array $doc): bool => $this->hasType($doc, 'slider'));
         $needsMotion = (bool) array_filter($documents, fn (array $doc): bool => $this->hasEntrance($doc));
+        // Only the header changes with the scroll position; a scrolled value anywhere in it asks
+        // for the small script that marks the page as scrolled.
+        $needsScrolled = isset($areas['header']) && $this->hasScrolled($areas['header']);
         $styles = $this->theme->css($theme).$this->scrollTopStyles($this->settings->load(), $theme).$this->styles->compileDocument($page['document']).$this->code->compileDocument($page['document']);
         foreach ([...array_values($areas), ...array_values($sections)] as $extra) {
             $styles .= $this->styles->compileDocument($extra).$this->code->compileDocument($extra);
@@ -107,6 +110,7 @@ final class PageController extends AbstractController
             // dafür ein Skript braucht - nach demselben Muster wie die Tabs.
             'needsSlider' => $needsSlider,
             'needsMotion' => $needsMotion,
+            'needsScrolled' => $needsScrolled,
             // Ein Bild, das sich vergroessern laesst, ist ohne Skript ein Verweis auf die
             // grosse Fassung. Das Skript kommt nur dazu, wo es etwas zu tun hat.
             'needsZoom' => $this->hasZoom($page['document']) || (bool) array_filter(array_values($areas), fn (array $area): bool => $this->hasZoom($area)),
@@ -136,7 +140,7 @@ final class PageController extends AbstractController
         // Die Pruefung braucht ein Skript von Cloudflare und einen Rahmen dafuer. Beides wird nur
         // dort erlaubt, wo tatsaechlich ein Formular steht - nicht auf jeder Seite der Website.
         $mitTurnstile = $this->turnstile->isActive() && $this->hasType($page['document'], 'form');
-        $wantsScript = ($mitTurnstile || $this->hasType($page['document'], 'tabs') || $needsSlider || $needsMotion || $this->hasZoom($page['document']) || [] !== $this->code->scriptsOf($page['document']));
+        $wantsScript = ($mitTurnstile || $this->hasType($page['document'], 'tabs') || $needsSlider || $needsMotion || $needsScrolled || $this->hasZoom($page['document']) || [] !== $this->code->scriptsOf($page['document']));
         $frames = $this->frameHosts($request, $page['document'], ...array_values($areas), ...array_values($sections));
         if ($mitTurnstile) {
             $frames[] = 'challenges.cloudflare.com';
@@ -413,6 +417,27 @@ final class PageController extends AbstractController
         return $gefunden;
     }
 
+    /** Whether any block carries values for the scrolled page (see StyleSchema::scrollable). */
+    private function hasScrolled(array $document): bool
+    {
+        $walk = function (array $blocks) use (&$walk): bool {
+            foreach ($blocks as $block) {
+                foreach ($block['style'] ?? [] as $values) {
+                    if ([] !== ($values['scrolled'] ?? [])) {
+                        return true;
+                    }
+                }
+                if ($walk($block['children'] ?? [])) {
+                    return true;
+                }
+            }
+
+            return false;
+        };
+
+        return $walk($document['blocks'] ?? []);
+    }
+
     private function hasEntrance(array $document): bool
     {
         $walk = function (array $blocks) use (&$walk): bool {
@@ -464,10 +489,13 @@ final class PageController extends AbstractController
         }
         $base = null === $term ? '/beitraege' : '/'.PostRepository::ARCHIVE_PREFIX[$kind].'/'.$term['slug'];
 
-        $frames = $this->frameHosts($request, ...array_values($this->areas()));
+        $areas = $this->areas();
+        $frames = $this->frameHosts($request, ...array_values($areas));
+        $needsScrolled = isset($areas['header']) && $this->hasScrolled($areas['header']);
 
         return $this->shell($this->render('archive.html.twig', [
-            'areas' => $this->areas(),
+            'areas' => $areas,
+            'needsScrolled' => $needsScrolled,
             'navigation' => $this->navigation(''),
             'term' => $term,
             'heading' => null === $term ? 'Beiträge' : $term['name'],
@@ -475,7 +503,7 @@ final class PageController extends AbstractController
             'base' => $base,
             'canonical' => rtrim($this->siteOrigin, '/').$base.($result['page'] > 1 ? '?seite='.$result['page'] : ''),
             'navigation' => $this->navigation(''),
-        ]), frameHosts: $frames);
+        ]), $needsScrolled, frameHosts: $frames);
     }
 
     #[Route('/feed.xml', name: 'feed', methods: ['GET'])]