diff --git a/.changeset/sweet-hornets-change.md b/.changeset/sweet-hornets-change.md
new file mode 100644
index 0000000000..a5ae91aa82
--- /dev/null
+++ b/.changeset/sweet-hornets-change.md
@@ -0,0 +1,5 @@
+---
+'gitbook': minor
+---
+
+Revamp mobile navigation
diff --git a/bun.lock b/bun.lock
index 156aa4b34b..9333dafbf3 100644
--- a/bun.lock
+++ b/bun.lock
@@ -48,7 +48,7 @@
     },
     "packages/gitbook": {
       "name": "gitbook",
-      "version": "0.14.0",
+      "version": "0.14.1",
       "dependencies": {
         "@gitbook/api": "catalog:",
         "@gitbook/cache-tags": "workspace:*",
@@ -98,6 +98,7 @@
         "openapi-types": "^12.1.3",
         "p-map": "^7.0.3",
         "quick-lru": "^7.0.1",
+        "react-aria": "^3.37.0",
         "react-hotkeys-hook": "^4.4.1",
         "rehype-sanitize": "^6.0.0",
         "rehype-stringify": "^10.0.1",
@@ -166,7 +167,7 @@
     },
     "packages/openapi-parser": {
       "name": "@gitbook/openapi-parser",
-      "version": "2.2.1",
+      "version": "2.2.2",
       "dependencies": {
         "@scalar/openapi-parser": "^0.18.0",
         "@scalar/openapi-types": "^0.1.9",
@@ -213,7 +214,7 @@
     },
     "packages/react-openapi": {
       "name": "@gitbook/react-openapi",
-      "version": "1.3.3",
+      "version": "1.3.4",
       "dependencies": {
         "@gitbook/openapi-parser": "workspace:*",
         "@scalar/api-client-react": "^1.3.16",
diff --git a/packages/gitbook/e2e/internal.spec.ts b/packages/gitbook/e2e/internal.spec.ts
index 0db15e0517..9caffb58e6 100644
--- a/packages/gitbook/e2e/internal.spec.ts
+++ b/packages/gitbook/e2e/internal.spec.ts
@@ -1695,6 +1695,57 @@ const testCases: TestsCase[] = [
             ]),
         ],
     },
+    {
+        name: 'Mobile menu',
+        contentBaseURL: 'https://gitbook-open-e2e-sites.gitbook.io/',
+        tests: [
+            {
+                name: 'Mobile menu open',
+                viewports: ['iphone-x'],
+                url: '',
+                run: async (page) => {
+                    // Set mobile viewport size to ensure mobile menu is visible
+                    await page.setViewportSize({ width: 375, height: 812 }); // iPhone X dimensions
+
+                    await page.locator('[data-testid="mobile-menu-button"]').click();
+
+                    // Wait for table of contents to appear
+                    const tableOfContents = page.locator('[data-testid="table-of-contents"]');
+                    await tableOfContents.waitFor({ state: 'visible', timeout: 5000 });
+                    await expect(tableOfContents).toBeVisible();
+                },
+            },
+            {
+                name: 'Mobile menu with dropdown menu',
+                viewports: ['iphone-x'],
+                url: 'multi-variants/',
+                run: async (page) => {
+                    // Set mobile viewport size to ensure mobile menu is visible
+                    await page.setViewportSize({ width: 375, height: 812 }); // iPhone X dimensions
+
+                    await page.locator('[data-testid="mobile-menu-button"]').click();
+
+                    // Wait for table of contents to appear
+                    const tableOfContents = page.locator('[data-testid="table-of-contents"]');
+                    await tableOfContents.waitFor({ state: 'visible', timeout: 5000 });
+                    await expect(tableOfContents).toBeVisible();
+
+                    // Wait for space dropdown button to be visible
+                    const spaceDropdownButton = tableOfContents.locator(
+                        '[data-testid="space-dropdown-button"]'
+                    );
+                    await spaceDropdownButton.waitFor({ state: 'visible', timeout: 5000 });
+                    await expect(spaceDropdownButton).toBeVisible();
+                    await spaceDropdownButton.click();
+
+                    // Wait for space dropdown to appear
+                    const spaceDropdown = page.locator('[data-testid="dropdown-menu"]');
+                    await spaceDropdown.waitFor({ state: 'visible', timeout: 5000 });
+                    await expect(spaceDropdown).toBeVisible();
+                },
+            },
+        ],
+    },
 ];
 
 runTestCases(testCases);
diff --git a/packages/gitbook/e2e/util.ts b/packages/gitbook/e2e/util.ts
index a38cc94f60..05e4b73211 100644
--- a/packages/gitbook/e2e/util.ts
+++ b/packages/gitbook/e2e/util.ts
@@ -67,6 +67,10 @@ export interface Test {
      * Whether to only run this test.
      */
     only?: boolean;
+    /**
+     * Viewport to use for the test.
+     */
+    viewports?: ('macbook-16' | 'macbook-13' | 'ipad-2' | 'iphone-x')[];
 }
 
 export type TestsCase = {
@@ -162,7 +166,7 @@ export function runTestCases(testCases: TestsCase[]) {
 
         test.describe(testCase.name, () => {
             for (const testEntry of testCase.tests) {
-                const { mode = 'page' } = testEntry;
+                const { mode = 'page', viewports } = testEntry;
                 const testFn = testEntry.only ? test.only : test;
                 testFn(testEntry.name, async ({ page, context }) => {
                     const testEntryPathname =
@@ -207,13 +211,18 @@ export function runTestCases(testCases: TestsCase[]) {
                         const screenshotName = `${testCase.name} - ${testEntry.name}`;
                         if (mode === 'image') {
                             await argosScreenshot(page, screenshotName, {
-                                viewports: ['macbook-13'],
+                                viewports: viewports ?? ['macbook-13'],
                                 threshold: screenshotOptions?.threshold ?? undefined,
                                 fullPage: true,
                             });
                         } else {
                             await argosScreenshot(page, screenshotName, {
-                                viewports: ['macbook-16', 'macbook-13', 'ipad-2', 'iphone-x'],
+                                viewports: viewports ?? [
+                                    'macbook-16',
+                                    'macbook-13',
+                                    'ipad-2',
+                                    'iphone-x',
+                                ],
                                 argosCSS: `
                             /* Hide Intercom */
                             .intercom-lightweight-app {
diff --git a/packages/gitbook/package.json b/packages/gitbook/package.json
index ef1f3208f4..6b123cd198 100644
--- a/packages/gitbook/package.json
+++ b/packages/gitbook/package.json
@@ -24,6 +24,7 @@
         "@tailwindcss/typography": "^0.5.16",
         "ai": "^4.2.2",
         "assert-never": "^1.2.1",
+        "react-aria": "^3.37.0",
         "bun-types": "^1.1.20",
         "classnames": "^2.5.1",
         "direction": "^2.0.1",
diff --git a/packages/gitbook/src/components/Header/Header.tsx b/packages/gitbook/src/components/Header/Header.tsx
index abc24f53f8..665c07c962 100644
--- a/packages/gitbook/src/components/Header/Header.tsx
+++ b/packages/gitbook/src/components/Header/Header.tsx
@@ -1,5 +1,6 @@
 import type { GitBookSiteContext } from '@/lib/context';
 
+import { HeaderMobileMenuButton } from '@/components/Header/HeaderMobileMenuButton';
 import { CONTAINER_STYLE, HEADER_HEIGHT_DESKTOP } from '@/components/layout';
 import { getSpaceLanguage, t } from '@/intl/server';
 import { tcls } from '@/lib/tailwind';
@@ -8,7 +9,6 @@ import { HeaderLink } from './HeaderLink';
 import { HeaderLinkMore } from './HeaderLinkMore';
 import { HeaderLinks } from './HeaderLinks';
 import { HeaderLogo } from './HeaderLogo';
-import { HeaderMobileMenu } from './HeaderMobileMenu';
 import { SpacesDropdown } from './SpacesDropdown';
 
 /**
@@ -78,7 +78,7 @@ export function Header(props: {
                                     'min-w-0 shrink items-center justify-start gap-2 lg:gap-4'
                                 )}
                             >
-                                <HeaderMobileMenu
+                                <HeaderMobileMenuButton
                                     className={tcls(
                                         'lg:hidden',
                                         '-ml-2',
diff --git a/packages/gitbook/src/components/Header/HeaderMobileMenu.tsx b/packages/gitbook/src/components/Header/HeaderMobileMenu.tsx
deleted file mode 100644
index 3b1668579d..0000000000
--- a/packages/gitbook/src/components/Header/HeaderMobileMenu.tsx
+++ /dev/null
@@ -1,57 +0,0 @@
-'use client';
-
-import { Icon } from '@gitbook/icons';
-import { usePathname } from 'next/navigation';
-import { useEffect, useRef } from 'react';
-
-import { tString, useLanguage } from '@/intl/client';
-import { tcls } from '@/lib/tailwind';
-
-import { useScrollListener } from '../hooks/useScrollListener';
-
-const globalClassName = 'navigation-open';
-
-const SCROLL_DISTANCE = 320;
-
-/**
- * Button to show/hide the table of content on mobile.
- */
-export function HeaderMobileMenu(props: Partial<React.ButtonHTMLAttributes<HTMLButtonElement>>) {
-    const language = useLanguage();
-
-    const pathname = usePathname();
-    const hasScrollRef = useRef(false);
-
-    const toggleNavigation = () => {
-        if (!hasScrollRef.current && document.body.classList.contains(globalClassName)) {
-            document.body.classList.remove(globalClassName);
-        } else {
-            document.body.classList.add(globalClassName);
-            window.scrollTo(0, 0);
-        }
-    };
-
-    const windowRef = useRef(typeof window === 'undefined' ? null : window);
-    useScrollListener(() => {
-        hasScrollRef.current = window.scrollY >= SCROLL_DISTANCE;
-    }, windowRef);
-
-    // Close the navigation when navigating to a page
-    useEffect(() => {
-        document.body.classList.remove(globalClassName);
-    }, [pathname]);
-
-    return (
-        <button
-            {...props}
-            aria-label={tString(language, 'table_of_contents_button_label')}
-            onClick={toggleNavigation}
-            className={tcls(
-                'flex flex-row items-center rounded straight-corners:rounded-sm px-2 py-1',
-                props.className
-            )}
-        >
-            <Icon icon="bars" className="size-4 text-inherit" />
-        </button>
-    );
-}
diff --git a/packages/gitbook/src/components/Header/HeaderMobileMenuButton.tsx b/packages/gitbook/src/components/Header/HeaderMobileMenuButton.tsx
new file mode 100644
index 0000000000..5bb5cf1466
--- /dev/null
+++ b/packages/gitbook/src/components/Header/HeaderMobileMenuButton.tsx
@@ -0,0 +1,36 @@
+'use client';
+
+import { Icon } from '@gitbook/icons';
+
+import { useMobileMenuSheet } from '@/components/MobileMenu/useMobileMenuSheet';
+import { tString, useLanguage } from '@/intl/client';
+import { tcls } from '@/lib/tailwind';
+
+/**
+ * Button to show/hide the table of content on mobile.
+ */
+export function HeaderMobileMenuButton(
+    props: Partial<React.ButtonHTMLAttributes<HTMLButtonElement>>
+) {
+    const language = useLanguage();
+    const { open, setOpen } = useMobileMenuSheet();
+
+    const toggleNavigation = () => {
+        setOpen(!open);
+    };
+
+    return (
+        <button
+            {...props}
+            aria-label={tString(language, 'table_of_contents_button_label')}
+            data-testid="mobile-menu-button"
+            onClick={toggleNavigation}
+            className={tcls(
+                'flex flex-row items-center rounded straight-corners:rounded-sm px-2 py-1',
+                props.className
+            )}
+        >
+            <Icon icon="bars" className="size-4 text-inherit" />
+        </button>
+    );
+}
diff --git a/packages/gitbook/src/components/Header/SpacesDropdown.tsx b/packages/gitbook/src/components/Header/SpacesDropdown.tsx
index 26846602b3..4f600f1b5b 100644
--- a/packages/gitbook/src/components/Header/SpacesDropdown.tsx
+++ b/packages/gitbook/src/components/Header/SpacesDropdown.tsx
@@ -11,8 +11,9 @@ export function SpacesDropdown(props: {
     siteSpace: SiteSpace;
     siteSpaces: SiteSpace[];
     className?: string;
+    withPortal?: boolean;
 }) {
-    const { context, siteSpace, siteSpaces, className } = props;
+    const { context, siteSpace, siteSpaces, className, withPortal } = props;
 
     return (
         <DropdownMenu
@@ -20,6 +21,7 @@ export function SpacesDropdown(props: {
                 'group-hover/dropdown:invisible', // Prevent hover from opening the dropdown, as it's annoying in this context
                 'group-focus-within/dropdown:group-hover/dropdown:visible' // When the dropdown is already open, it should remain visible when hovered
             )}
+            withPortal={withPortal}
             button={
                 <div
                     data-testid="space-dropdown-button"
diff --git a/packages/gitbook/src/components/MobileMenu/MobileMenuScript.tsx b/packages/gitbook/src/components/MobileMenu/MobileMenuScript.tsx
new file mode 100644
index 0000000000..9bfdd33498
--- /dev/null
+++ b/packages/gitbook/src/components/MobileMenu/MobileMenuScript.tsx
@@ -0,0 +1,23 @@
+'use client';
+
+import { useMobileMenuSheet } from '@/components/MobileMenu';
+import { usePathname } from 'next/navigation';
+import { useEffect } from 'react';
+import { usePreventScroll } from 'react-aria';
+
+export function MobileMenuScript() {
+    const pathname = usePathname();
+    const { open, setOpen } = useMobileMenuSheet();
+
+    // biome-ignore lint/correctness/useExhaustiveDependencies: Close the navigation when navigating to a page
+    useEffect(() => {
+        setOpen(false);
+    }, [pathname]);
+
+    // Prevent scrolling when the menu is open
+    usePreventScroll({
+        isDisabled: !open,
+    });
+
+    return null;
+}
diff --git a/packages/gitbook/src/components/MobileMenu/index.ts b/packages/gitbook/src/components/MobileMenu/index.ts
new file mode 100644
index 0000000000..e9ea4d0ce0
--- /dev/null
+++ b/packages/gitbook/src/components/MobileMenu/index.ts
@@ -0,0 +1,2 @@
+export * from './useMobileMenuSheet';
+export * from './MobileMenuScript';
diff --git a/packages/gitbook/src/components/MobileMenu/useMobileMenuSheet.ts b/packages/gitbook/src/components/MobileMenu/useMobileMenuSheet.ts
new file mode 100644
index 0000000000..8de4d1071f
--- /dev/null
+++ b/packages/gitbook/src/components/MobileMenu/useMobileMenuSheet.ts
@@ -0,0 +1,12 @@
+import { create } from 'zustand';
+
+/**
+ * Hooks to manage the mobile menu sheet state.
+ */
+export const useMobileMenuSheet = create<{
+    open: boolean;
+    setOpen: (open: boolean) => void;
+}>((set) => ({
+    open: false,
+    setOpen: (open) => set({ open }),
+}));
diff --git a/packages/gitbook/src/components/SpaceLayout/SpaceLayout.tsx b/packages/gitbook/src/components/SpaceLayout/SpaceLayout.tsx
index f57aec64cd..27e1ed7634 100644
--- a/packages/gitbook/src/components/SpaceLayout/SpaceLayout.tsx
+++ b/packages/gitbook/src/components/SpaceLayout/SpaceLayout.tsx
@@ -4,7 +4,7 @@ import React from 'react';
 
 import { Footer } from '@/components/Footer';
 import { Header, HeaderLogo } from '@/components/Header';
-import { TableOfContents } from '@/components/TableOfContents';
+import { TOCScrollContent, TableOfContents } from '@/components/TableOfContents';
 import { CONTAINER_STYLE } from '@/components/layout';
 import { tcls } from '@/lib/tailwind';
 
@@ -105,7 +105,6 @@ export function SpaceLayout(props: {
                                 )}
                             >
                                 <TableOfContents
-                                    context={context}
                                     header={
                                         withTopHeader ? null : (
                                             <div
@@ -123,34 +122,43 @@ export function SpaceLayout(props: {
                                             </div>
                                         )
                                     }
-                                    innerHeader={
-                                        // displays the search button and/or the space dropdown in the ToC according to the header/variant settings. E.g if there is no header, the search button will be displayed in the ToC.
-                                        <>
-                                            {!withTopHeader && searchAndAI}
-                                            {!withTopHeader && withSections && sections && (
-                                                <SiteSectionList
-                                                    className={tcls('hidden', 'lg:block')}
-                                                    sections={encodeClientSiteSections(
-                                                        context,
-                                                        sections
+                                >
+                                    <TOCScrollContent
+                                        context={context}
+                                        innerHeader={
+                                            (!withTopHeader && !!searchAndAI) ||
+                                            (!withTopHeader && withSections && !!sections) ||
+                                            (isMultiVariants && !sections) ? (
+                                                // displays the search button and/or the space dropdown in the ToC according to the header/variant settings. E.g if there is no header, the search button will be displayed in the ToC.
+                                                <>
+                                                    {!withTopHeader && searchAndAI}
+                                                    {!withTopHeader && withSections && sections && (
+                                                        <SiteSectionList
+                                                            className={tcls('hidden', 'lg:block')}
+                                                            sections={encodeClientSiteSections(
+                                                                context,
+                                                                sections
+                                                            )}
+                                                        />
                                                     )}
-                                                />
-                                            )}
-                                            {isMultiVariants && !sections && (
-                                                <SpacesDropdown
-                                                    context={context}
-                                                    siteSpace={siteSpace}
-                                                    siteSpaces={siteSpaces}
-                                                    className={tcls(
-                                                        'w-full',
-                                                        'page-no-toc:hidden',
-                                                        'site-header-none:page-no-toc:flex'
+                                                    {isMultiVariants && !sections && (
+                                                        <SpacesDropdown
+                                                            context={context}
+                                                            siteSpace={siteSpace}
+                                                            siteSpaces={siteSpaces}
+                                                            className={tcls(
+                                                                'w-full',
+                                                                'page-no-toc:hidden',
+                                                                'site-header-none:page-no-toc:flex'
+                                                            )}
+                                                            withPortal={false}
+                                                        />
                                                     )}
-                                                />
-                                            )}
-                                        </>
-                                    }
-                                />
+                                                </>
+                                            ) : null
+                                        }
+                                    />
+                                </TableOfContents>
                                 <div className="flex min-w-0 flex-1 flex-col">{children}</div>
                             </div>
                         </div>
diff --git a/packages/gitbook/src/components/TableOfContents/PageGroupItem.tsx b/packages/gitbook/src/components/TableOfContents/PageGroupItem.tsx
index d1f946de98..1ac8d4f5e8 100644
--- a/packages/gitbook/src/components/TableOfContents/PageGroupItem.tsx
+++ b/packages/gitbook/src/components/TableOfContents/PageGroupItem.tsx
@@ -25,8 +25,8 @@ export function PageGroupItem(props: { page: ClientTOCPageGroup }) {
                     '[html.sidebar-filled.theme-bold.tint_&]:bg-tint-subtle',
                     '[html.sidebar-filled.theme-muted_&]:bg-tint-base',
                     '[html.sidebar-filled.theme-bold.tint_&]:bg-tint-base',
-                    '[html.sidebar-default.theme-gradient_&]:bg-gradient-primary',
-                    '[html.sidebar-default.theme-gradient.tint_&]:bg-gradient-tint'
+                    'lg:[html.sidebar-default.theme-gradient_&]:bg-gradient-primary',
+                    'lg:[html.sidebar-default.theme-gradient.tint_&]:bg-gradient-tint'
                 )}
             >
                 <TOCPageIcon page={page} />
diff --git a/packages/gitbook/src/components/TableOfContents/TOCScrollContent.tsx b/packages/gitbook/src/components/TableOfContents/TOCScrollContent.tsx
new file mode 100644
index 0000000000..d850922e77
--- /dev/null
+++ b/packages/gitbook/src/components/TableOfContents/TOCScrollContent.tsx
@@ -0,0 +1,70 @@
+import { PagesList } from '@/components/TableOfContents';
+import { Trademark } from '@/components/TableOfContents';
+import { TOCScrollContainer } from '@/components/TableOfContents/TOCScroller';
+import { encodeClientTableOfContents } from '@/components/TableOfContents/encodeClientTableOfContents';
+import type { GitBookSiteContext } from '@/lib/context';
+import { tcls } from '@/lib/tailwind';
+import { SiteInsightsTrademarkPlacement } from '@gitbook/api';
+
+export async function TOCScrollContent(props: {
+    context: GitBookSiteContext;
+    innerHeader?: React.ReactNode;
+}) {
+    const { context, innerHeader } = props;
+    const { customization, revision } = context;
+
+    const pages = await encodeClientTableOfContents(context, revision.pages, revision.pages);
+
+    return (
+        <div // The actual sidebar, either shown with a filled bg or transparent.
+            className={tcls(
+                'lg:-ms-5',
+                'relative flex flex-grow flex-col overflow-hidden border-tint-subtle',
+
+                'sidebar-filled:bg-tint-subtle',
+                'theme-muted:bg-tint-subtle',
+                '[html.sidebar-filled.theme-bold.tint_&]:bg-tint-subtle',
+                '[html.sidebar-filled.theme-muted_&]:bg-tint-base',
+                '[html.sidebar-filled.theme-bold.tint_&]:bg-tint-base',
+                '[html.sidebar-filled.theme-gradient_&]:border',
+                'page-no-toc:!bg-transparent',
+                'page-no-toc:!border-none',
+
+                'sidebar-filled:rounded-xl',
+                'straight-corners:rounded-none'
+            )}
+        >
+            {!!innerHeader && (
+                <div className="inline-flex w-full flex-col gap-4 px-2 max-lg:pt-2 max-lg:pr-14 max-lg:pb-2 lg:pr-4 lg:first:mt-4">
+                    {innerHeader}
+                </div>
+            )}
+
+            <TOCScrollContainer // The scrollview inside the sidebar
+                className={tcls(
+                    'flex flex-grow flex-col p-2',
+                    innerHeader ? 'mt-0 lg:mt-4' : 'mt-11 lg:mt-0',
+                    customization.trademark.enabled && 'pb-[4.5rem]',
+                    'gutter-stable overflow-y-auto',
+                    '[&::-webkit-scrollbar]:bg-transparent',
+                    '[&::-webkit-scrollbar-thumb]:bg-transparent',
+                    'group-hover:[&::-webkit-scrollbar]:bg-tint-subtle',
+                    'group-hover:[&::-webkit-scrollbar-thumb]:bg-tint-7',
+                    'group-hover:[&::-webkit-scrollbar-thumb:hover]:bg-tint-8'
+                )}
+            >
+                <PagesList
+                    pages={pages}
+                    style="page-no-toc:hidden border-tint-subtle sidebar-list-line:border-l"
+                />
+                {customization.trademark.enabled ? (
+                    <Trademark
+                        space={context.space}
+                        customization={customization}
+                        placement={SiteInsightsTrademarkPlacement.Sidebar}
+                    />
+                ) : null}
+            </TOCScrollContainer>
+        </div>
+    );
+}
diff --git a/packages/gitbook/src/components/TableOfContents/TableOfContents.tsx b/packages/gitbook/src/components/TableOfContents/TableOfContents.tsx
index bbccbca991..2ae5e78de6 100644
--- a/packages/gitbook/src/components/TableOfContents/TableOfContents.tsx
+++ b/packages/gitbook/src/components/TableOfContents/TableOfContents.tsx
@@ -1,43 +1,75 @@
-import type { GitBookSiteContext } from '@/lib/context';
-import { SiteInsightsTrademarkPlacement } from '@gitbook/api';
-import type React from 'react';
+'use client';
 
+import { MobileMenuScript, useMobileMenuSheet } from '@/components/MobileMenu';
+import { TableOfContentsScript } from '@/components/TableOfContents/TableOfContentsScript';
+import { Button } from '@/components/primitives';
 import { tcls } from '@/lib/tailwind';
+import type React from 'react';
 
-import { PagesList } from './PagesList';
-import { TOCScrollContainer } from './TOCScroller';
-import { TableOfContentsScript } from './TableOfContentsScript';
-import { Trademark } from './Trademark';
-import { encodeClientTableOfContents } from './encodeClientTableOfContents';
-
-export async function TableOfContents(props: {
-    context: GitBookSiteContext;
+export function TableOfContents(props: {
     header?: React.ReactNode; // Displayed outside the scrollable TOC as a sticky header
-    innerHeader?: React.ReactNode; // Displayed outside the scrollable TOC, directly above the page list
+    children: React.ReactNode;
 }) {
-    const { innerHeader, context, header } = props;
-    const { space, customization, revision } = context;
-
-    const pages = await encodeClientTableOfContents(context, revision.pages, revision.pages);
+    const { header, children } = props;
+    const { open, setOpen } = useMobileMenuSheet();
 
     return (
         <>
+            <div
+                className="fixed inset-0 z-40 bg-tint-12/4 backdrop-blur-lg data-[state=closed]:pointer-events-none data-[state=closed]:invisible data-[state=closed]:animate-fadeOut data-[state=open]:animate-fadeIn lg:hidden dark:bg-tint-1/6"
+                data-state={open ? 'open' : 'closed'}
+                onClick={() => setOpen(false)}
+            />
             <aside // Sidebar container, responsible for setting the right dimensions and position for the sidebar.
                 data-testid="table-of-contents"
                 id="table-of-contents"
+                data-state={open ? 'open' : 'closed'}
                 className={tcls(
                     'group',
+
+                    'flex',
+                    'flex-col',
+                    'gap-4',
+
+                    'border-tint-subtle',
+
+                    'fixed',
+                    'z-50',
+
+                    'max-lg:transition',
+                    'max-lg:ease-in-out',
+                    'max-lg:duration-500',
+
+                    'max-lg:rounded-xl',
+                    'max-lg:circular-corners:rounded-2xl',
+                    'max-lg:straight-corners:rounded-none',
+                    'max-lg:bg-tint-base',
+                    'max-lg:sidebar-filled:bg-tint-subtle',
+                    'max-lg:theme-muted:bg-tint-subtle',
+                    'max-lg:[html.sidebar-filled.theme-bold.tint_&]:bg-tint-subtle',
+                    'max-lg:[html.sidebar-filled.theme-muted_&]:bg-tint-base',
+                    'max-lg:[html.sidebar-filled.theme-bold.tint_&]:bg-tint-base',
+
+                    'max-lg:pb-2',
+                    'max-lg:w-10/12',
+                    'max-lg:shadow-lg',
+                    'max-lg:depth-flat:shadow-none',
+                    'max-lg:inset-1.5',
+                    'max-lg:transition-all',
+                    'max-lg:duration-300',
+                    'max-lg:max-w-sm',
+                    'max-lg:data-[state=open]:left-1.5',
+                    'max-lg:data-[state=closed]:-left-full',
+
                     'text-sm',
 
                     'grow-0',
                     'shrink-0',
-                    'basis-full',
                     'lg:basis-72',
                     'page-no-toc:lg:basis-56',
 
-                    'relative',
-                    'z-[1]',
                     'lg:sticky',
+                    'lg:z-[1]',
                     'lg:mr-12',
 
                     // Server-side static positioning
@@ -57,72 +89,36 @@ export async function TableOfContents(props: {
                     '[html[style*="--toc-top-offset"]_&]:lg:!top-[var(--toc-top-offset)]',
                     '[html[style*="--toc-height"]_&]:lg:!h-[var(--toc-height)]',
 
-                    'pt-6',
-                    'pb-4',
+                    'lg:pt-6',
+                    'lg:pb-4',
                     'sidebar-filled:lg:pr-6',
                     'page-no-toc:lg:pr-0',
 
-                    'hidden',
-                    'navigation-open:!flex',
-                    'lg:flex',
                     'page-no-toc:lg:hidden',
                     'page-no-toc:xl:flex',
-                    'site-header-none:page-no-toc:lg:flex',
-                    'flex-col',
-                    'gap-4',
-
-                    'navigation-open:border-b',
-                    'border-tint-subtle'
+                    'site-header-none:page-no-toc:lg:flex'
                 )}
             >
                 {header && header}
-                <div // The actual sidebar, either shown with a filled bg or transparent.
-                    className={tcls(
-                        'lg:-ms-5',
-                        'relative flex flex-grow flex-col overflow-hidden border-tint-subtle',
-
-                        'sidebar-filled:bg-tint-subtle',
-                        'theme-muted:bg-tint-subtle',
-                        '[html.sidebar-filled.theme-bold.tint_&]:bg-tint-subtle',
-                        '[html.sidebar-filled.theme-muted_&]:bg-tint-base',
-                        '[html.sidebar-filled.theme-bold.tint_&]:bg-tint-base',
-                        '[html.sidebar-filled.theme-gradient_&]:border',
-                        'page-no-toc:!bg-transparent',
-                        'page-no-toc:!border-none',
-
-                        'sidebar-filled:rounded-xl',
-                        'straight-corners:rounded-none',
-                        '[html.sidebar-filled.circular-corners_&]:page-has-toc:rounded-3xl'
-                    )}
-                >
-                    {innerHeader && <div className="px-5 *:my-4">{innerHeader}</div>}
-                    <TOCScrollContainer // The scrollview inside the sidebar
-                        className={tcls(
-                            'flex flex-grow flex-col p-2',
-                            customization.trademark.enabled && 'lg:pb-20',
-                            'lg:gutter-stable overflow-y-auto',
-                            '[&::-webkit-scrollbar]:bg-transparent',
-                            '[&::-webkit-scrollbar-thumb]:bg-transparent',
-                            'group-hover:[&::-webkit-scrollbar]:bg-tint-subtle',
-                            'group-hover:[&::-webkit-scrollbar-thumb]:bg-tint-7',
-                            'group-hover:[&::-webkit-scrollbar-thumb:hover]:bg-tint-8'
-                        )}
+
+                {open ? (
+                    <Button
+                        variant="blank"
+                        icon="close"
+                        iconOnly
+                        size="medium"
+                        autoFocus={false}
+                        className="absolute top-2 right-2 z-50 aspect-square size-[calc(2.25rem+1px)] justify-center bg-transparent text-tint opacity-8 shadow-none ring-transparent lg:hidden"
+                        onClick={() => setOpen(false)}
                     >
-                        <PagesList
-                            pages={pages}
-                            style="page-no-toc:hidden border-tint-subtle sidebar-list-line:border-l"
-                        />
-                        {customization.trademark.enabled ? (
-                            <Trademark
-                                space={space}
-                                customization={customization}
-                                placement={SiteInsightsTrademarkPlacement.Sidebar}
-                            />
-                        ) : null}
-                    </TOCScrollContainer>
-                </div>
+                        <span className="sr-only">Close</span>
+                    </Button>
+                ) : null}
+
+                {children}
             </aside>
             <TableOfContentsScript />
+            <MobileMenuScript />
         </>
     );
 }
diff --git a/packages/gitbook/src/components/TableOfContents/Trademark.tsx b/packages/gitbook/src/components/TableOfContents/Trademark.tsx
index dac24155d5..ed4068e99f 100644
--- a/packages/gitbook/src/components/TableOfContents/Trademark.tsx
+++ b/packages/gitbook/src/components/TableOfContents/Trademark.tsx
@@ -21,13 +21,13 @@ export function Trademark(props: {
     return (
         <div
             className={tcls(
-                'relative',
                 'z-[2]',
-                'lg:absolute',
+                'absolute',
 
-                'left-0',
+                'left-2',
                 'right-2',
                 'bottom-0',
+                'lg:left-0',
 
                 'pointer-events-none',
                 'sidebar-filled:pl-2',
@@ -44,8 +44,7 @@ export function Trademark(props: {
                 'straight-corners:rounded-none',
                 'circular-corners:rounded-2xl',
 
-                'before:hidden',
-                'lg:before:block',
+                'before:block',
                 'before:content-[""]',
                 'before:absolute',
                 'before:inset-x-0',
@@ -111,8 +110,7 @@ export function TrademarkLink(props: {
                 'hover:bg-tint',
                 'hover:text-tint-strong',
 
-                'ring-2',
-                'lg:ring-1',
+                'ring-1',
                 'ring-inset',
                 'ring-tint-subtle',
 
diff --git a/packages/gitbook/src/components/TableOfContents/index.ts b/packages/gitbook/src/components/TableOfContents/index.ts
index 6eeff92697..d52040bae8 100644
--- a/packages/gitbook/src/components/TableOfContents/index.ts
+++ b/packages/gitbook/src/components/TableOfContents/index.ts
@@ -2,3 +2,4 @@ export { TableOfContents } from './TableOfContents';
 export { PagesList } from './PagesList';
 export { TOCScrollContainer } from './TOCScroller';
 export { Trademark } from './Trademark';
+export { TOCScrollContent } from './TOCScrollContent';
diff --git a/packages/gitbook/src/components/primitives/DropdownMenu.tsx b/packages/gitbook/src/components/primitives/DropdownMenu.tsx
index 76b24bfd4b..eea271a9fa 100644
--- a/packages/gitbook/src/components/primitives/DropdownMenu.tsx
+++ b/packages/gitbook/src/components/primitives/DropdownMenu.tsx
@@ -7,6 +7,7 @@ import { createContext, useCallback, useContext, useState } from 'react';
 import { type ClassValue, tcls } from '@/lib/tailwind';
 
 import * as RadixDropdownMenu from '@radix-ui/react-dropdown-menu';
+import { Slot } from '@radix-ui/react-slot';
 
 import { assert } from 'ts-essentials';
 import { Link, type LinkInsightsProps } from '.';
@@ -34,8 +35,14 @@ export function DropdownMenu(props: {
     children: React.ReactNode;
     /** Custom styles */
     className?: ClassValue;
-    /** Open the dropdown on hover */
+    /** Open the dropdown on hover
+     * @default false
+     */
     openOnHover?: boolean;
+    /** Whether to render the dropdown menu in a portal
+     * @default true
+     */
+    withPortal?: boolean;
     /**
      * Side of the dropdown
      * @default "bottom"
@@ -54,12 +61,15 @@ export function DropdownMenu(props: {
         openOnHover = false,
         side = 'bottom',
         align = 'start',
+        withPortal = true,
     } = props;
     const [hovered, setHovered] = useState(false);
     const [open, setOpen] = useState(false);
 
     const isOpen = openOnHover ? open || hovered : open;
 
+    const Portal = withPortal ? RadixDropdownMenu.Portal : Slot;
+
     return (
         <DropdownMenuContext.Provider value={{ open: isOpen, setOpen }}>
             <RadixDropdownMenu.Root modal={false} open={isOpen} onOpenChange={setOpen}>
@@ -73,7 +83,7 @@ export function DropdownMenu(props: {
                     {button}
                 </RadixDropdownMenu.Trigger>
 
-                <RadixDropdownMenu.Portal>
+                <Portal>
                     <RadixDropdownMenu.Content
                         data-testid="dropdown-menu"
                         hideWhenDetached
@@ -93,7 +103,7 @@ export function DropdownMenu(props: {
                             {children}
                         </div>
                     </RadixDropdownMenu.Content>
-                </RadixDropdownMenu.Portal>
+                </Portal>
             </RadixDropdownMenu.Root>
         </DropdownMenuContext.Provider>
     );