diff --git a/assets/js/app.js b/assets/js/app.js
index 90b3f78..8c3c529 100644
--- a/assets/js/app.js
+++ b/assets/js/app.js
@@ -201,9 +201,10 @@
   const lbThumbs = document.getElementById('lbThumbs');
   const lbIndex  = document.getElementById('lbIndex');
 
-  let lbList  = [];  // current scoped post list
-  let lbIdx   = -1;  // index into lbList
-  let lbBuilt = false;
+  let lbList     = [];    // current scoped post list
+  let lbIdx      = -1;   // index into lbList
+  let lbBuilt    = false;
+  let lbReferrer = null; // URL to return to on close
 
   function lbOpen(slug, scopedList) {
     lbList = scopedList || POSTS;
@@ -223,9 +224,15 @@
     lb.dataset.open = 'false';
     document.body.style.overflow = '';
     if (window.__ROUX_OPEN_SLUG) {
+      // Direct load of a single-post URL — go back to the issue page
       const cur = lbList[lbIdx];
       const issueId = (cur && cur.issue) || '01';
       navigate(`/issues/${issueId}/`);
+    } else if (lbReferrer) {
+      // Opened from a grid page — return to it
+      const ref = lbReferrer;
+      lbReferrer = null;
+      navigate(ref);
     }
   }
 
@@ -361,7 +368,7 @@
     const clicked = POSTS.find(p => p.slug === slug);
     const issueId = clicked ? clicked.issue : null;
     const scopedList = issueId ? POSTS.filter(p => p.issue === issueId) : POSTS;
-    // Update URL without page reload
+    lbReferrer = location.href;
     history.pushState({ slug }, '', card.href);
     lbOpen(slug, scopedList.length ? scopedList : POSTS);
   });
diff --git a/static/js/app.js b/static/js/app.js
index 90b3f78..8c3c529 100644
--- a/static/js/app.js
+++ b/static/js/app.js
@@ -201,9 +201,10 @@
   const lbThumbs = document.getElementById('lbThumbs');
   const lbIndex  = document.getElementById('lbIndex');
 
-  let lbList  = [];  // current scoped post list
-  let lbIdx   = -1;  // index into lbList
-  let lbBuilt = false;
+  let lbList     = [];    // current scoped post list
+  let lbIdx      = -1;   // index into lbList
+  let lbBuilt    = false;
+  let lbReferrer = null; // URL to return to on close
 
   function lbOpen(slug, scopedList) {
     lbList = scopedList || POSTS;
@@ -223,9 +224,15 @@
     lb.dataset.open = 'false';
     document.body.style.overflow = '';
     if (window.__ROUX_OPEN_SLUG) {
+      // Direct load of a single-post URL — go back to the issue page
       const cur = lbList[lbIdx];
       const issueId = (cur && cur.issue) || '01';
       navigate(`/issues/${issueId}/`);
+    } else if (lbReferrer) {
+      // Opened from a grid page — return to it
+      const ref = lbReferrer;
+      lbReferrer = null;
+      navigate(ref);
     }
   }
 
@@ -361,7 +368,7 @@
     const clicked = POSTS.find(p => p.slug === slug);
     const issueId = clicked ? clicked.issue : null;
     const scopedList = issueId ? POSTS.filter(p => p.issue === issueId) : POSTS;
-    // Update URL without page reload
+    lbReferrer = location.href;
     history.pushState({ slug }, '', card.href);
     lbOpen(slug, scopedList.length ? scopedList : POSTS);
   });