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>

public/assets/scrolled.js

@@ -0,0 +1,19 @@
+/**
+ * Marks the page as scrolled.
+ *
+ * A header can carry a second set of colours for the scrolled page - transparent over the hero,
+ * solid once the reader has moved on, the way the Flatsome transparent header works. The
+ * stylesheet holds both states; this only says which one applies. Without the script the header
+ * keeps its normal colours, which is a readable page, not a broken one.
+ */
+export function initScrolled(doc = document) {
+  const view = doc.defaultView;
+  let queued = false;
+  const sync = () => { queued = false; doc.documentElement.classList.toggle('is-scrolled', view.scrollY > 40); };
+  const onScroll = () => { if (!queued) { queued = true; view.requestAnimationFrame(sync); } };
+  view.addEventListener('scroll', onScroll, { passive: true });
+  sync();
+  return () => { view.removeEventListener('scroll', onScroll); doc.documentElement.classList.remove('is-scrolled'); };
+}
+
+if (!document.querySelector('#editor')) initScrolled();