diff --git a/public/s/css/f0ckm.css b/public/s/css/f0ckm.css
index e6a347c..4db9f34 100644
--- a/public/s/css/f0ckm.css
+++ b/public/s/css/f0ckm.css
@@ -1815,6 +1815,25 @@ body.layout-modern .global-sidebar-right {
     grid-column: 1;
   }
 
+  /* Body-level left-sidebar hide — set by blocking inline script before first paint
+     to prevent the sidebar from flashing visible. Mirrors the .sidebar-hidden rules above
+     but activates from the body class so it works before the container element exists. */
+  body.layout-modern.sidebar-left-hidden .item-layout-container {
+    grid-template-columns: minmax(0, 1fr) 400px;
+  }
+
+  body.layout-modern.sidebar-left-hidden.sidebar-right-hidden .item-layout-container {
+    grid-template-columns: 1fr;
+  }
+
+  body.layout-modern.sidebar-left-hidden .item-layout-container .item-sidebar-left {
+    display: none;
+  }
+
+  body.layout-modern.sidebar-left-hidden .item-layout-container .item-main-content {
+    grid-column: 1;
+  }
+
   body.layout-modern .item-sidebar-right,
   body.layout-modern .global-sidebar-right {
     grid-column: 3;
@@ -5440,13 +5459,14 @@ span#tags:not(.tags-expanded) .tags-inner>span:nth-child(n+11) {
   } */
 
   /* layout-modern: both sidebar AND comments visible — column is narrow, full 16:9 fits */
-  body.layout-modern:not(.sidebar-right-hidden) .item-layout-container:not(.sidebar-hidden) .embed-responsive-16by9::before {
+  body.layout-modern:not(.sidebar-right-hidden):not(.sidebar-left-hidden) .item-layout-container:not(.sidebar-hidden) .embed-responsive-16by9::before {
     padding-top: 54.25%;
   }
 
   /* layout-modern: either sidebar OR comments hidden (or both) — column is wider, reduce */
   body.layout-modern.sidebar-right-hidden .embed-responsive-16by9::before,
-  body.layout-modern .item-layout-container.sidebar-hidden .embed-responsive-16by9::before {
+  body.layout-modern .item-layout-container.sidebar-hidden .embed-responsive-16by9::before,
+  body.layout-modern.sidebar-left-hidden .embed-responsive-16by9::before {
     padding-top: 40.25%;
   }
 }
diff --git a/public/s/js/comments.js b/public/s/js/comments.js
index ebee305..6c08bbc 100644
--- a/public/s/js/comments.js
+++ b/public/s/js/comments.js
@@ -41,6 +41,9 @@ class CommentSystem {
         };
 
         // Restore visibility state
+        // The body class 'sidebar-left-hidden' is already set by the blocking
+        // inline script in header.html (prevents flash). Here we sync the
+        // container-level class and display state to match.
         if (this.container) {
             const isHidden = localStorage.getItem('comments_hidden') === 'true';
             // Force show if hash is present
@@ -48,9 +51,13 @@ class CommentSystem {
                 this.container.classList.remove('faded-out');
                 this.container.style.display = 'block';
                 localStorage.setItem('comments_hidden', 'false');
+                document.body.classList.remove('sidebar-left-hidden');
+                const layout = this.container.closest('.item-layout-container');
+                if (layout) layout.classList.remove('sidebar-hidden');
             } else if (isHidden) {
                 this.container.classList.add('faded-out');
                 this.container.style.display = 'none';
+                document.body.classList.add('sidebar-left-hidden');
                 const layout = this.container.closest('.item-layout-container');
                 if (layout) layout.classList.add('sidebar-hidden');
             }
@@ -3784,6 +3791,7 @@ class CommentSystem {
         if (isHidden) {
             // SHOW: expand grid first, then slide content in
             if (layout) layout.classList.remove('sidebar-hidden');
+            document.body.classList.remove('sidebar-left-hidden');
             this.container.style.display = '';
             localStorage.setItem('comments_hidden', 'false');
             void this.container.offsetWidth; // force reflow so transition fires
@@ -3798,6 +3806,7 @@ class CommentSystem {
                 if (!this.container.classList.contains('faded-out')) return;
                 this.container.style.display = 'none';
                 if (layout) layout.classList.add('sidebar-hidden');
+                document.body.classList.add('sidebar-left-hidden');
             }, 300);
         }
     }
diff --git a/public/s/js/f0ckm.js b/public/s/js/f0ckm.js
index 1486889..24fe95f 100644
--- a/public/s/js/f0ckm.js
+++ b/public/s/js/f0ckm.js
@@ -6618,6 +6618,7 @@ window.cancelAnimFrame = (function () {
       sb.style.setProperty('transition', 'none', 'important');
       if (isHidden) {
         layout.classList.remove('sidebar-hidden');
+        document.body.classList.remove('sidebar-left-hidden');
         sb.style.display = '';
         sb.querySelectorAll('.faded-out').forEach(el => el.classList.remove('faded-out'));
         const c = sb.querySelector('#comments-container');
@@ -6643,11 +6644,13 @@ window.cancelAnimFrame = (function () {
         if (shouldOpen) {
           sb.style.removeProperty('transform');
           localStorage.setItem('comments_hidden', 'false');
+          document.body.classList.remove('sidebar-left-hidden');
         } else {
           // Hide BEFORE removing transform to prevent snap-back flash
           sb.style.display = 'none';
           layout.classList.add('sidebar-hidden');
           localStorage.setItem('comments_hidden', 'true');
+          document.body.classList.add('sidebar-left-hidden');
           sb.style.removeProperty('transform');
         }
         requestAnimationFrame(() => syncLeftEdgeZone());
diff --git a/views/snippets/header.html b/views/snippets/header.html
index 5059cb4..2c74a9b 100644
--- a/views/snippets/header.html
+++ b/views/snippets/header.html
@@ -78,7 +78,7 @@
 </head>
 
 <body class="@if(session)@if(session.use_new_layout)layout-modern@else layout-legacy @endif@else @if(default_layout === 'legacy')layout-legacy@else layout-modern@endif @endif @if(private_society && !session)private-gate-active@endif">
-  <script>if(localStorage.getItem('sidebarRightHidden')==='true')document.body.classList.add('sidebar-right-hidden');</script>
+  <script>if(localStorage.getItem('sidebarRightHidden')==='true')document.body.classList.add('sidebar-right-hidden');if(localStorage.getItem('comments_hidden')==='true')document.body.classList.add('sidebar-left-hidden');</script>
   @if(!private_society || session)
   <canvas class="hidden-xs" id="bg"></canvas>
   @endif