Clean up CSS

assets/style.css

@@ -42,11 +42,6 @@
     --font-xs: 0.75rem;
     --font-sm: 0.85rem;
 
-    /* Height of the sticky top header. Single source of truth for the
-       sidebar/TOC top offsets and anchor scroll-padding. Hardcoded (the
-       desktop header is a single-row grid); revisit if the header wraps. */
-    --header-h: 3.25rem;
-
     /* Width of the persistent left folder-tree rail (desktop). */
     --tree-width: 15rem;
 
@@ -586,20 +581,10 @@ aside.sidebar:empty { display: none; }
     border: none;
 }
 
-/* === Table of contents (floating variant) ===
+/* === Table of contents ===
-   Default rendering is a fixed floating panel; inside .sidebar it becomes
+   Rendered as a .panel-sidebar block in the right rail (padding + font-size
-   static via the .panel-sidebar density class. */
+   come from that density class); toc.js always mounts it there, on both
-.toc {
+   desktop and inside the mobile Overlay. */
-    position: fixed;
-    top: calc(var(--header-h) + var(--space-2));
-    right: var(--space-4);
-    width: 14rem;
-    max-height: calc(100vh - 6rem);
-    overflow-y: auto;
-    padding: var(--space-2) var(--space-3);
-    font-size: var(--font-sm);
-}
-.sidebar .toc { position: static; width: auto; max-height: none; }
 .toc ul { list-style: none; margin: 0; padding: 0; }
 .toc li { margin: 0.15rem 0; }
 .toc a {