Mobile: keep sidebar menu always on top of 3D viewer overlays (z-index 1000)

theme/blog_share_theme_coffee.css

@@ -1886,3 +1886,14 @@ html.theme-light .mermaid svg .cluster-label text {
 .hljs-attr { color: #cf90a2; }
 html.theme-light .hljs-name { color: #8e2d53; }
 html.theme-light .hljs-attr { color: #4f6b00; }
+/* ---------- Mobile: Menu always on top (above 3D viewer overlays) ---------- */
+@media (max-width: 48em) {
+    #left-pane,
+    #toc-pane {
+        z-index: 1000;
+    }
+    #header {
+        position: relative;
+        z-index: 1000;
+    }
+}

theme/blog_share_theme_gruvbox.css

@@ -1886,3 +1886,14 @@ html.theme-light .mermaid svg .cluster-label text {
 .hljs-attr { color: #83a598; }
 html.theme-light .hljs-name { color: #076678; }
 html.theme-light .hljs-attr { color: #427b58; }
+/* ---------- Mobile: Menu always on top (above 3D viewer overlays) ---------- */
+@media (max-width: 48em) {
+    #left-pane,
+    #toc-pane {
+        z-index: 1000;
+    }
+    #header {
+        position: relative;
+        z-index: 1000;
+    }
+}

theme/blog_share_theme_harbor.css

@@ -1886,3 +1886,14 @@ html.theme-light .mermaid svg .cluster-label text {
 .hljs-attr { color: #77838a; }
 html.theme-light .hljs-name { color: #4c6c94; }
 html.theme-light .hljs-attr { color: #556753; }
+/* ---------- Mobile: Menu always on top (above 3D viewer overlays) ---------- */
+@media (max-width: 48em) {
+    #left-pane,
+    #toc-pane {
+        z-index: 1000;
+    }
+    #header {
+        position: relative;
+        z-index: 1000;
+    }
+}

theme/blog_share_theme_solarized.css

@@ -1891,3 +1891,14 @@ html.theme-light .mermaid svg .cluster-label text {
 .hljs-attr { color: #839496; }
 html.theme-light .hljs-name { color: #268bd2; }
 html.theme-light .hljs-attr { color: #586e75; }
+/* ---------- Mobile: Menu always on top (above 3D viewer overlays) ---------- */
+@media (max-width: 48em) {
+    #left-pane,
+    #toc-pane {
+        z-index: 1000;
+    }
+    #header {
+        position: relative;
+        z-index: 1000;
+    }
+}

theme/blog_share_theme_tokyonight.css

@@ -1891,3 +1891,14 @@ html.theme-light .mermaid svg .cluster-label text {
 .hljs-attr { color: #a9b1d6; }
 html.theme-light .hljs-name { color: #2e7de9; }
 html.theme-light .hljs-attr { color: #a0a6c2; }
+/* ---------- Mobile: Menu always on top (above 3D viewer overlays) ---------- */
+@media (max-width: 48em) {
+    #left-pane,
+    #toc-pane {
+        z-index: 1000;
+    }
+    #header {
+        position: relative;
+        z-index: 1000;
+    }
+}