diff --git a/index.html b/index.html
index d677e3d..1891c3f 100644
--- a/index.html
+++ b/index.html
@@ -846,8 +846,16 @@ const Utils = {
   },
 
   getCategory(tag) {
-    // Category is determined by the current base being viewed
-    return State.get("base");
+    // Category is determined by the tag's set_hst (parent category MRF)
+    const setHst = tag.set_hst;
+    if (!setHst) return State.get("base");
+
+    // Look up the category tag in hstTags
+    const hstTags = State.get("hstTags");
+    const categoryTag = hstTags.find(t => t.mrf === setHst);
+
+    // Return the ref of the category tag, or fall back to base
+    return categoryTag?.ref || State.get("base");
   },
 
   updateHash() {