+ {/* Sidebar — fixed to the viewport, left-aligned with the max-w-7xl (80rem)
+ centered container. On screens narrower than 80rem, left is 0. */}
+
+
+
+
+ {/* Content area — pl-80 reserves space for the fixed sidebar (w-60) + gap (20).
+ No independent centering: the parent max-w-7xl is the single source of truth. */}
+