diff --git a/adventskalender/shared/js/glitter.js b/adventskalender/shared/js/glitter.js
index 435d026..9bea2cb 100644
--- a/adventskalender/shared/js/glitter.js
+++ b/adventskalender/shared/js/glitter.js
@@ -92,4 +92,17 @@ document.querySelectorAll(".door, .openfield").forEach(elem => {
       }
     }, 300);
   });
+});
+
+// Hover-Sync: Tür <-> offenes Feld reagieren gemeinsam
+document.querySelectorAll(".door, .openfield").forEach(el => {
+  const isDoor = el.classList.contains("door");
+  const day = el.dataset.day;
+  const partner = document.querySelector(
+    isDoor ? `.openfield[data-day="${day}"]` : `.door[data-day="${day}"]`
+  );
+  if (!partner) return;
+
+  el.addEventListener("mouseenter", () => partner.classList.add("hover-sync"));
+  el.addEventListener("mouseleave", () => partner.classList.remove("hover-sync"));
 });
\ No newline at end of file