diff --git a/app/(app)/canvas/[canvasId]/page.tsx b/app/(app)/canvas/[canvasId]/page.tsx
index c382a8e..2de6829 100644
--- a/app/(app)/canvas/[canvasId]/page.tsx
+++ b/app/(app)/canvas/[canvasId]/page.tsx
@@ -1,8 +1,6 @@
 import { notFound, redirect } from "next/navigation";
 
-import Canvas from "@/components/canvas/canvas";
-import ConnectionBanner from "@/components/canvas/connection-banner";
-import CanvasSidebar from "@/components/canvas/canvas-sidebar";
+import { CanvasShell } from "@/components/canvas/canvas-shell";
 import { api } from "@/convex/_generated/api";
 import type { Id } from "@/convex/_generated/dataModel";
 import { fetchAuthQuery, isAuthenticated } from "@/lib/auth-server";
@@ -48,13 +46,5 @@ export default async function CanvasPage({
     notFound();
   }
 
-  return (
-    <div className="flex h-screen w-screen overflow-hidden">
-      <CanvasSidebar canvasId={typedCanvasId} />
-      <div className="relative min-h-0 min-w-0 flex-1">
-        <ConnectionBanner />
-        <Canvas canvasId={typedCanvasId} />
-      </div>
-    </div>
-  );
+  return <CanvasShell canvasId={typedCanvasId} />;
 }
diff --git a/components/canvas/canvas-shell.tsx b/components/canvas/canvas-shell.tsx
new file mode 100644
index 0000000..73be485
--- /dev/null
+++ b/components/canvas/canvas-shell.tsx
@@ -0,0 +1,77 @@
+"use client";
+
+import { useCallback, useState } from "react";
+
+import Canvas from "@/components/canvas/canvas";
+import ConnectionBanner from "@/components/canvas/connection-banner";
+import CanvasSidebar from "@/components/canvas/canvas-sidebar";
+import {
+  ResizableHandle,
+  ResizablePanel,
+  ResizablePanelGroup,
+} from "@/components/ui/resizable";
+import type { Id } from "@/convex/_generated/dataModel";
+
+const SIDEBAR_DEFAULT_SIZE = "18%";
+const SIDEBAR_COLLAPSE_THRESHOLD = "10%";
+const SIDEBAR_MAX_SIZE = "40%";
+const SIDEBAR_COLLAPSED_SIZE = "64px";
+const SIDEBAR_RAIL_MAX_WIDTH_PX = 112;
+const MAIN_PANEL_MIN_SIZE = "40%";
+
+type CanvasShellProps = {
+  canvasId: Id<"canvases">;
+};
+
+type PanelSize = {
+  asPercentage: number;
+  inPixels: number;
+};
+
+export function CanvasShell({ canvasId }: CanvasShellProps) {
+  const [isSidebarRail, setIsSidebarRail] = useState(false);
+
+  const handleSidebarResize = useCallback((panelSize: PanelSize) => {
+    setIsSidebarRail(panelSize.inPixels <= SIDEBAR_RAIL_MAX_WIDTH_PX);
+  }, []);
+
+  return (
+    <div className="h-screen w-screen overflow-hidden overscroll-none">
+      <ResizablePanelGroup
+        direction="horizontal"
+        className="h-full w-full min-h-0 min-w-0 overflow-hidden"
+      >
+        <ResizablePanel
+          id="canvas-sidebar-panel"
+          order={1}
+          defaultSize={SIDEBAR_DEFAULT_SIZE}
+          minSize={SIDEBAR_COLLAPSE_THRESHOLD}
+          maxSize={SIDEBAR_MAX_SIZE}
+          collapsible
+          collapsedSize={SIDEBAR_COLLAPSED_SIZE}
+          className="min-h-0 min-w-0 overflow-hidden"
+          onResize={handleSidebarResize}
+        >
+          <CanvasSidebar canvasId={canvasId} railMode={isSidebarRail} />
+        </ResizablePanel>
+
+        <ResizableHandle
+          withHandle
+          className="w-1 bg-border/80 transition-colors hover:bg-primary/30"
+        />
+
+        <ResizablePanel
+          id="canvas-main-panel"
+          order={2}
+          minSize={MAIN_PANEL_MIN_SIZE}
+          className="min-h-0 min-w-0"
+        >
+          <div className="relative h-full min-h-0 w-full min-w-0 overflow-hidden">
+            <ConnectionBanner />
+            <Canvas canvasId={canvasId} />
+          </div>
+        </ResizablePanel>
+      </ResizablePanelGroup>
+    </div>
+  );
+}
diff --git a/components/canvas/canvas-sidebar.tsx b/components/canvas/canvas-sidebar.tsx
index 21cf475..3310822 100644
--- a/components/canvas/canvas-sidebar.tsx
+++ b/components/canvas/canvas-sidebar.tsx
@@ -77,7 +77,13 @@ const CATALOG_ICONS: Partial<Record<string, LucideIcon>> = {
   presentation: Presentation,
 };
 
-function SidebarRow({ entry }: { entry: NodeCatalogEntry }) {
+function SidebarRow({
+  entry,
+  compact = false,
+}: {
+  entry: NodeCatalogEntry;
+  compact?: boolean;
+}) {
   const enabled = isNodePaletteEnabled(entry);
   const Icon = CATALOG_ICONS[entry.type] ?? ClipboardList;
 
@@ -95,28 +101,36 @@ function SidebarRow({ entry }: { entry: NodeCatalogEntry }) {
       onDragStart={onDragStart}
       title={enabled ? `${entry.label} — auf den Canvas ziehen` : hint}
       className={cn(
-        "flex items-center gap-2 rounded-lg border px-3 py-2 text-sm transition-colors",
+        "rounded-lg border transition-colors",
+        compact
+          ? "flex h-10 w-full items-center justify-center p-0"
+          : "flex items-center gap-2 px-3 py-2 text-sm",
         enabled
           ? "cursor-grab border-border/80 bg-card hover:bg-accent active:cursor-grabbing"
           : "cursor-not-allowed border-transparent bg-muted/30 text-muted-foreground",
       )}
     >
       <Icon className="size-4 shrink-0 opacity-80" />
-      <span className="min-w-0 flex-1 truncate">{entry.label}</span>
-      {entry.phase > 1 ? (
+      {!compact ? <span className="min-w-0 flex-1 truncate">{entry.label}</span> : null}
+      {!compact && entry.phase > 1 ? (
         <span className="shrink-0 text-[10px] font-medium tabular-nums text-muted-foreground/80">
           P{entry.phase}
         </span>
       ) : null}
+      {compact ? <span className="sr-only">{entry.label}</span> : null}
     </div>
   );
 }
 
 type CanvasSidebarProps = {
   canvasId: Id<"canvases">;
+  railMode?: boolean;
 };
 
-export default function CanvasSidebar({ canvasId }: CanvasSidebarProps) {
+export default function CanvasSidebar({
+  canvasId,
+  railMode = false,
+}: CanvasSidebarProps) {
   const canvas = useAuthQuery(api.canvases.get, { canvasId });
   const byCategory = catalogEntriesByCategory();
   const [collapsedByCategory, setCollapsedByCategory] = useState<
@@ -127,63 +141,95 @@ export default function CanvasSidebar({ canvasId }: CanvasSidebarProps) {
     ),
   );
 
+  const railEntries = NODE_CATEGORIES_ORDERED.flatMap(
+    (categoryId) => byCategory.get(categoryId) ?? [],
+  );
+
   return (
-    <aside className="flex w-60 shrink-0 flex-col border-r border-border/80 bg-background">
-      <div className="border-b border-border/80 px-4 py-4">
-        {canvas === undefined ? (
-          <div className="h-12 animate-pulse rounded-md bg-muted/50" />
+    <aside className="flex h-full w-full min-w-0 overflow-hidden flex-col border-r border-border/80 bg-background">
+      {railMode ? (
+        <div className="border-b border-border/80 px-2 py-3">
+          <div className="flex items-center justify-center">
+            <span
+              className="line-clamp-1 text-center text-[11px] font-semibold uppercase tracking-wide text-muted-foreground"
+              title={canvas?.name ?? "Canvas"}
+            >
+              {canvas?.name?.slice(0, 2).toUpperCase() ?? "CV"}
+            </span>
+          </div>
+        </div>
+      ) : (
+        <div className="border-b border-border/80 px-4 py-4">
+          {canvas === undefined ? (
+            <div className="h-12 animate-pulse rounded-md bg-muted/50" />
+          ) : (
+            <>
+              <p className="text-xs font-medium uppercase tracking-wide text-muted-foreground">
+                Canvas
+              </p>
+              <h1 className="mt-1 line-clamp-2 text-base font-semibold leading-snug text-foreground">
+                {canvas?.name ?? "…"}
+              </h1>
+            </>
+          )}
+        </div>
+      )}
+
+      <div
+        className={cn(
+          "flex-1 overflow-y-auto overscroll-contain",
+          railMode ? "p-2" : "p-3",
+        )}
+      >
+        {railMode ? (
+          <div className="flex flex-col gap-1.5">
+            {railEntries.map((entry) => (
+              <SidebarRow key={entry.type} entry={entry} compact />
+            ))}
+          </div>
         ) : (
           <>
-            <p className="text-xs font-medium uppercase tracking-wide text-muted-foreground">
-              Canvas
-            </p>
-            <h1 className="mt-1 line-clamp-2 text-base font-semibold leading-snug text-foreground">
-              {canvas?.name ?? "…"}
-            </h1>
+            {NODE_CATEGORIES_ORDERED.map((categoryId) => {
+              const entries = byCategory.get(categoryId) ?? [];
+              if (entries.length === 0) return null;
+              const { label } = NODE_CATEGORY_META[categoryId];
+              const isCollapsed = collapsedByCategory[categoryId] ?? categoryId !== "source";
+              return (
+                <div key={categoryId} className="mb-4 last:mb-0">
+                  <button
+                    type="button"
+                    onClick={() =>
+                      setCollapsedByCategory((prev) => ({
+                        ...prev,
+                        [categoryId]: !(prev[categoryId] ?? categoryId !== "source"),
+                      }))
+                    }
+                    className="mb-2 flex w-full items-center justify-between rounded-md px-0.5 py-1 text-left text-xs font-medium uppercase tracking-wide text-muted-foreground transition-colors hover:bg-muted/40 hover:text-foreground"
+                    aria-expanded={!isCollapsed}
+                    aria-controls={`sidebar-category-${categoryId}`}
+                  >
+                    <span>{label}</span>
+                    {isCollapsed ? (
+                      <ChevronRight className="size-3.5 shrink-0" />
+                    ) : (
+                      <ChevronDown className="size-3.5 shrink-0" />
+                    )}
+                  </button>
+                  {!isCollapsed ? (
+                    <div id={`sidebar-category-${categoryId}`} className="flex flex-col gap-1.5">
+                      {entries.map((entry) => (
+                        <SidebarRow key={entry.type} entry={entry} />
+                      ))}
+                    </div>
+                  ) : null}
+                </div>
+              );
+            })}
           </>
         )}
       </div>
 
-      <div className="flex-1 overflow-y-auto p-3">
-        {NODE_CATEGORIES_ORDERED.map((categoryId) => {
-          const entries = byCategory.get(categoryId) ?? [];
-          if (entries.length === 0) return null;
-          const { label } = NODE_CATEGORY_META[categoryId];
-          const isCollapsed = collapsedByCategory[categoryId] ?? categoryId !== "source";
-          return (
-            <div key={categoryId} className="mb-4 last:mb-0">
-              <button
-                type="button"
-                onClick={() =>
-                  setCollapsedByCategory((prev) => ({
-                    ...prev,
-                    [categoryId]: !(prev[categoryId] ?? categoryId !== "source"),
-                  }))
-                }
-                className="mb-2 flex w-full items-center justify-between rounded-md px-0.5 py-1 text-left text-xs font-medium uppercase tracking-wide text-muted-foreground transition-colors hover:bg-muted/40 hover:text-foreground"
-                aria-expanded={!isCollapsed}
-                aria-controls={`sidebar-category-${categoryId}`}
-              >
-                <span>{label}</span>
-                {isCollapsed ? (
-                  <ChevronRight className="size-3.5 shrink-0" />
-                ) : (
-                  <ChevronDown className="size-3.5 shrink-0" />
-                )}
-              </button>
-              {!isCollapsed ? (
-                <div id={`sidebar-category-${categoryId}`} className="flex flex-col gap-1.5">
-                  {entries.map((entry) => (
-                    <SidebarRow key={entry.type} entry={entry} />
-                  ))}
-                </div>
-              ) : null}
-            </div>
-          );
-        })}
-      </div>
-
-      <CanvasUserMenu />
+      <CanvasUserMenu compact={railMode} />
     </aside>
   );
 }
diff --git a/components/canvas/canvas-user-menu.tsx b/components/canvas/canvas-user-menu.tsx
index 437c2d7..f987487 100644
--- a/components/canvas/canvas-user-menu.tsx
+++ b/components/canvas/canvas-user-menu.tsx
@@ -20,7 +20,11 @@ function getInitials(nameOrEmail: string) {
   return normalized.slice(0, 2).toUpperCase();
 }
 
-export function CanvasUserMenu() {
+type CanvasUserMenuProps = {
+  compact?: boolean;
+};
+
+export function CanvasUserMenu({ compact = false }: CanvasUserMenuProps) {
   const router = useRouter();
   const { data: session, isPending } = authClient.useSession();
 
@@ -37,7 +41,49 @@ export function CanvasUserMenu() {
   if (isPending && !session?.user) {
     return (
       <div className="border-t p-3">
-        <div className="h-10 animate-pulse rounded-lg bg-muted/60" />
+        <div
+          className={
+            compact
+              ? "mx-auto h-9 w-9 animate-pulse rounded-full bg-muted/60"
+              : "h-10 animate-pulse rounded-lg bg-muted/60"
+          }
+        />
+      </div>
+    );
+  }
+
+  if (compact) {
+    return (
+      <div className="border-t border-border/80 p-2">
+        <div className="flex flex-col items-center gap-1.5">
+          <Avatar className="size-9 shrink-0 border border-border/60">
+            <AvatarFallback className="bg-muted text-xs font-medium text-muted-foreground">
+              {initials}
+            </AvatarFallback>
+          </Avatar>
+          <Button
+            variant="ghost"
+            size="icon"
+            className="size-8 text-muted-foreground"
+            asChild
+            title="Dashboard"
+          >
+            <Link href="/dashboard" aria-label="Dashboard">
+              <LayoutDashboard className="size-4" />
+            </Link>
+          </Button>
+          <Button
+            variant="ghost"
+            size="icon"
+            className="size-8 text-muted-foreground"
+            type="button"
+            title="Abmelden"
+            aria-label="Abmelden"
+            onClick={() => void handleSignOut()}
+          >
+            <LogOut className="size-4" />
+          </Button>
+        </div>
       </div>
     );
   }
diff --git a/components/ui/resizable.tsx b/components/ui/resizable.tsx
new file mode 100644
index 0000000..c9e767a
--- /dev/null
+++ b/components/ui/resizable.tsx
@@ -0,0 +1,50 @@
+"use client"
+
+import * as ResizablePrimitive from "react-resizable-panels"
+
+import { cn } from "@/lib/utils"
+
+function ResizablePanelGroup({
+  className,
+  ...props
+}: ResizablePrimitive.GroupProps) {
+  return (
+    <ResizablePrimitive.Group
+      data-slot="resizable-panel-group"
+      className={cn(
+        "flex h-full w-full aria-[orientation=vertical]:flex-col",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function ResizablePanel({ ...props }: ResizablePrimitive.PanelProps) {
+  return <ResizablePrimitive.Panel data-slot="resizable-panel" {...props} />
+}
+
+function ResizableHandle({
+  withHandle,
+  className,
+  ...props
+}: ResizablePrimitive.SeparatorProps & {
+  withHandle?: boolean
+}) {
+  return (
+    <ResizablePrimitive.Separator
+      data-slot="resizable-handle"
+      className={cn(
+        "relative flex w-px items-center justify-center bg-border ring-offset-background after:absolute after:inset-y-0 after:left-1/2 after:w-1 after:-translate-x-1/2 focus-visible:ring-1 focus-visible:ring-ring focus-visible:outline-hidden aria-[orientation=horizontal]:h-px aria-[orientation=horizontal]:w-full aria-[orientation=horizontal]:after:left-0 aria-[orientation=horizontal]:after:h-1 aria-[orientation=horizontal]:after:w-full aria-[orientation=horizontal]:after:translate-x-0 aria-[orientation=horizontal]:after:-translate-y-1/2 [&[aria-orientation=horizontal]>div]:rotate-90",
+        className
+      )}
+      {...props}
+    >
+      {withHandle && (
+        <div className="z-10 flex h-6 w-1 shrink-0 rounded-lg bg-border" />
+      )}
+    </ResizablePrimitive.Separator>
+  )
+}
+
+export { ResizableHandle, ResizablePanel, ResizablePanelGroup }
diff --git a/package.json b/package.json
index 4781f7c..a9fb5a4 100644
--- a/package.json
+++ b/package.json
@@ -36,6 +36,7 @@
     "radix-ui": "^1.4.3",
     "react": "19.2.4",
     "react-dom": "19.2.4",
+    "react-resizable-panels": "^4.8.0",
     "resend": "^4.8.0",
     "shadcn": "^4.1.0",
     "tailwind-merge": "^3.5.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 1116944..4ab25ce 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -86,6 +86,9 @@ importers:
       react-dom:
         specifier: 19.2.4
         version: 19.2.4(react@19.2.4)
+      react-resizable-panels:
+        specifier: ^4.8.0
+        version: 4.8.0(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
       resend:
         specifier: ^4.8.0
         version: 4.8.0(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
@@ -5569,6 +5572,12 @@ packages:
       '@types/react':
         optional: true
 
+  react-resizable-panels@4.8.0:
+    resolution: {integrity: sha512-2uEABkewb3ky/ZgIlAUxWa1W/LjsK494fdV1QsXxst7CDRHCzo7h22tWWu3NNaBjmiuriOCt3CvhipnaYcpoIw==}
+    peerDependencies:
+      react: ^18.0.0 || ^19.0.0
+      react-dom: ^18.0.0 || ^19.0.0
+
   react-style-singleton@2.2.3:
     resolution: {integrity: sha512-b6jSvxvVnyptAiLjbkWLE/lOnR4lfTtDAl+eUC7RZy+QQWc6wRzIV2CE6xBuMmDxc2qIihtDCZD5NPOFl7fRBQ==}
     engines: {node: '>=10'}
@@ -12080,6 +12089,11 @@ snapshots:
     optionalDependencies:
       '@types/react': 19.2.14
 
+  react-resizable-panels@4.8.0(react-dom@19.2.4(react@19.2.4))(react@19.2.4):
+    dependencies:
+      react: 19.2.4
+      react-dom: 19.2.4(react@19.2.4)
+
   react-style-singleton@2.2.3(@types/react@19.2.14)(react@19.2.4):
     dependencies:
       get-nonce: 1.0.1