diff --git a/assets/js/app.js b/assets/js/app.js
index cefc81d..90b3f78 100644
--- a/assets/js/app.js
+++ b/assets/js/app.js
@@ -358,8 +358,9 @@
     if (!card) return;
     e.preventDefault();
     const slug = card.dataset.slug;
-    const visibleSlugs = Array.from(document.querySelectorAll('.card[data-slug]')).map(c => c.dataset.slug);
-    const scopedList = POSTS.filter(p => visibleSlugs.includes(p.slug));
+    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
     history.pushState({ slug }, '', card.href);
     lbOpen(slug, scopedList.length ? scopedList : POSTS);
@@ -426,8 +427,9 @@
       const script = doc.querySelector('script[data-open-slug]');
       const openSlug = window.__ROUX_OPEN_SLUG = doc.querySelector('[data-open-slug]')?.dataset.openSlug || null;
       if (openSlug) {
-        const visibleSlugs = Array.from(document.querySelectorAll('.card[data-slug]')).map(c => c.dataset.slug);
-        const scoped = POSTS.filter(p => visibleSlugs.includes(p.slug));
+        const opened = POSTS.find(p => p.slug === openSlug);
+        const issueId = opened ? opened.issue : null;
+        const scoped = issueId ? POSTS.filter(p => p.issue === issueId) : POSTS;
         lbOpen(openSlug, scoped.length ? scoped : POSTS);
       }
     });
@@ -450,8 +452,9 @@
 
   // ── On single-post pages: auto-open lightbox
   if (window.__ROUX_OPEN_SLUG && POSTS.length) {
-    const visibleSlugs = Array.from(document.querySelectorAll('.card[data-slug]')).map(c => c.dataset.slug);
-    const scoped = POSTS.filter(p => visibleSlugs.includes(p.slug));
+    const opened = POSTS.find(p => p.slug === window.__ROUX_OPEN_SLUG);
+    const issueId = opened ? opened.issue : null;
+    const scoped = issueId ? POSTS.filter(p => p.issue === issueId) : POSTS;
     lbOpen(window.__ROUX_OPEN_SLUG, scoped.length ? scoped : POSTS);
   }
 
diff --git a/static/js/app.js b/static/js/app.js
index cefc81d..90b3f78 100644
--- a/static/js/app.js
+++ b/static/js/app.js
@@ -358,8 +358,9 @@
     if (!card) return;
     e.preventDefault();
     const slug = card.dataset.slug;
-    const visibleSlugs = Array.from(document.querySelectorAll('.card[data-slug]')).map(c => c.dataset.slug);
-    const scopedList = POSTS.filter(p => visibleSlugs.includes(p.slug));
+    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
     history.pushState({ slug }, '', card.href);
     lbOpen(slug, scopedList.length ? scopedList : POSTS);
@@ -426,8 +427,9 @@
       const script = doc.querySelector('script[data-open-slug]');
       const openSlug = window.__ROUX_OPEN_SLUG = doc.querySelector('[data-open-slug]')?.dataset.openSlug || null;
       if (openSlug) {
-        const visibleSlugs = Array.from(document.querySelectorAll('.card[data-slug]')).map(c => c.dataset.slug);
-        const scoped = POSTS.filter(p => visibleSlugs.includes(p.slug));
+        const opened = POSTS.find(p => p.slug === openSlug);
+        const issueId = opened ? opened.issue : null;
+        const scoped = issueId ? POSTS.filter(p => p.issue === issueId) : POSTS;
         lbOpen(openSlug, scoped.length ? scoped : POSTS);
       }
     });
@@ -450,8 +452,9 @@
 
   // ── On single-post pages: auto-open lightbox
   if (window.__ROUX_OPEN_SLUG && POSTS.length) {
-    const visibleSlugs = Array.from(document.querySelectorAll('.card[data-slug]')).map(c => c.dataset.slug);
-    const scoped = POSTS.filter(p => visibleSlugs.includes(p.slug));
+    const opened = POSTS.find(p => p.slug === window.__ROUX_OPEN_SLUG);
+    const issueId = opened ? opened.issue : null;
+    const scoped = issueId ? POSTS.filter(p => p.issue === issueId) : POSTS;
     lbOpen(window.__ROUX_OPEN_SLUG, scoped.length ? scoped : POSTS);
   }