v3: the cards under "related" and "in collections" come back from transparent — both lists lighten a card by dimming it and tightening the box, and also blanked its fill, which assumed the border was what drew the card. A theme is free to draw one with the surface alone: smooth and melange both set --card-border: transparent, so with the background gone there was nothing left — text floating on the page in smooth, a shadow around a hole in melange. The fill stays now and the theme's own skin comes through; the weight still comes down through the opacity, the tighter padding and the smaller type, which is where it belonged. nyt is untouched, its own flat-ink rule still winning the list back to hairline rules.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/App.css

@@ -4993,10 +4993,15 @@ body.has-player .chat-fab {
   max-width: none;
 }
 
+/* Subordination is carried by the dimming and the tighter box, not by
+   dropping the fill: a theme is free to draw its cards with the surface alone
+   (smooth and melange both set --card-border: transparent), so blanking the
+   background there left nothing to see — text floating on the page, or, in
+   melange, a shadow around a hole. Whatever skin the theme gives a card is
+   kept; only its weight comes down. */
 .related-section .dump-card {
   border-width: 1px;
   border-radius: var(--radius-lg);
-  background: transparent;
   opacity: 0.78;
   transition: border-color var(--dur-base), opacity var(--dur-base);
 }
@@ -5040,7 +5045,6 @@ body.has-player .chat-fab {
 .collections-section .playlist-card {
   border-width: 1px;
   border-radius: var(--radius-lg);
-  background: transparent;
   opacity: 0.78;
   transition: border-color var(--dur-base), opacity var(--dur-base);
 }