First try

(not enabled for now)

.changeset/curly-eels-carry.md

@@ -0,0 +1,5 @@
+---
+"gitbook": patch
+---
+
+Add sidesheet component, use it for TOC and AIChat

packages/gitbook/src/app/sites/dynamic/[mode]/[siteURL]/[siteData]/(content)/layout.tsx

@@ -23,7 +23,8 @@ export default async function SiteDynamicLayout({
 
     return (
         <CustomizationRootLayout
-            className="site-background"
+            htmlClassName="sheet-open:gutter-stable"
+            bodyClassName="site-background"
             forcedTheme={forcedTheme}
             context={context}
         >

packages/gitbook/src/app/sites/static/[mode]/[siteURL]/[siteData]/(content)/layout.tsx

@@ -19,7 +19,11 @@ export default async function SiteStaticLayout({
     const withTracking = shouldTrackEvents();
 
     return (
-        <CustomizationRootLayout className="site-background" context={context}>
+        <CustomizationRootLayout
+            htmlClassName="sheet-open:gutter-stable"
+            bodyClassName="site-background"
+            context={context}
+        >
             <SiteLayout
                 context={context}
                 withTracking={withTracking}

packages/gitbook/src/components/AIChat/AIChat.tsx

@@ -27,6 +27,7 @@ import { useTrackEvent } from '../Insights';
 import { useNow } from '../hooks';
 import { Button } from '../primitives';
 import { ScrollContainer } from '../primitives/ScrollContainer';
+import { SideSheet } from '../primitives/SideSheet';
 import { AIChatControlButton } from './AIChatControlButton';
 import { AIChatIcon } from './AIChatIcon';
 import { AIChatInput } from './AIChatInput';
@@ -69,16 +70,23 @@ export function AIChat() {
     }, [chat.opened, trackEvent]);
 
     return (
-        <div
+        <SideSheet
+            side="right"
+            open={chat.opened}
+            onOpenChange={(open) => {
+                if (open) {
+                    chatController.open();
+                } else {
+                    chatController.close();
+                }
+            }}
             data-testid="ai-chat"
+            withScrim={true}
             className={tcls(
-                'ai-chat inset-y-0 right-0 z-40 mx-auto flex max-w-3xl scroll-mt-36 px-4 py-4 transition-[width,opacity,margin,display] transition-discrete duration-300 sm:px-6 lg:fixed lg:w-80 lg:p-0 xl:w-96',
-                chat.opened
-                    ? 'lg:starting:ml-0 lg:starting:w-0 lg:starting:opacity-0'
-                    : 'hidden lg:ml-0 lg:w-0! lg:opacity-0'
+                'ai-chat mx-auto ml-8 not-hydrated:hidden w-96 transition-[width] duration-300 ease-quint lg:max-xl:w-80'
             )}
         >
-            <EmbeddableFrame className="relative shrink-0 border-tint-subtle border-l to-tint-base transition-all duration-300 max-lg:circular-corners:rounded-3xl max-lg:rounded-corners:rounded-md max-lg:border lg:w-80 xl:w-96">
+            <EmbeddableFrame className="relative shrink-0 border-tint-subtle border-l to-tint-base">
                 <EmbeddableFrameMain>
                     <EmbeddableFrameHeader>
                         <AIChatDynamicIcon trademark={config.trademark} />
@@ -109,7 +117,7 @@ export function AIChat() {
                     </EmbeddableFrameBody>
                 </EmbeddableFrameMain>
             </EmbeddableFrame>
-        </div>
+        </SideSheet>
     );
 }
 
@@ -220,8 +228,8 @@ export function AIChatBody(props: {
                 className="shrink grow basis-80 animate-fade-in-slow [container-type:size]"
                 contentClassName="p-4 gutter-stable flex flex-col gap-4"
                 orientation="vertical"
-                fadeEdges={['leading']}
-                active={`message-group-${chat.messages.filter((message) => message.role === 'user').length - 1}`}
+                trailing={{ fade: false, button: true }}
+                active={`#message-group-${chat.messages.filter((message) => message.role === 'user').length - 1}`}
             >
                 {isEmpty ? (
                     <div className="flex grow flex-col">

packages/gitbook/src/components/Announcement/AnnouncementBanner.tsx

@@ -35,66 +35,68 @@ export function AnnouncementBanner(props: {
             data-nosnippet=""
         >
             <div className="transition-all duration-300 lg:chat-open:pr-80 xl:chat-open:pr-96">
-                <div className={tcls('relative', CONTAINER_STYLE)}>
-                    <Tag
-                        href={contentRef?.href ?? ''}
-                        className={tcls(
-                            'flex w-full items-start justify-center overflow-hidden circular-corners:rounded-xl rounded-md straight-corners:rounded-none px-4 py-3 text-neutral-strong text-sm theme-bold:ring-1 theme-gradient:ring-1 ring-inset transition-colors',
-                            style.container,
-                            closeable && 'pr-12',
-                            hasLink && style.hover
-                        )}
-                        insights={
-                            announcement.link
-                                ? {
-                                      type: 'link_click',
-                                      link: {
-                                          target: announcement.link.to,
-                                          position: SiteInsightsLinkPosition.Announcement,
-                                      },
-                                  }
-                                : undefined
-                        }
-                    >
-                        <Icon
-                            icon={style.icon as IconName}
-                            className={`mt-0.5 mr-3 size-4 shrink-0 ${style.iconColor}`}
-                        />
-                        <div>
-                            {announcement.message}
-                            {hasLink ? (
-                                <div className={tcls(LinkStyles, style.link, 'ml-1 inline')}>
-                                    {contentRef?.icon ? (
-                                        <span className="mr-1 ml-2 *:inline">
-                                            {contentRef?.icon}
-                                        </span>
-                                    ) : null}
-                                    {announcement.link?.title && (
-                                        <span className="mr-1">{announcement.link?.title}</span>
-                                    )}
-                                    <Icon
-                                        icon={
-                                            announcement.link?.to.kind === 'url'
-                                                ? 'arrow-up-right'
-                                                : 'chevron-right'
-                                        }
-                                        className={tcls('mb-0.5 inline size-3')}
-                                    />
-                                </div>
-                            ) : null}
-                        </div>
-                    </Tag>
-                    {closeable ? (
-                        <Button
-                            iconOnly
-                            icon="close"
-                            label={tString(language, 'close')}
-                            variant="blank"
-                            size="default"
-                            onClick={dismissAnnouncement}
-                            className={`absolute top-0 right-4 mt-2 mr-2 circular-corners:rounded-lg rounded-sm straight-corners:rounded-none p-1.5 transition-all hover:ring-1 sm:right-6 md:right-8 ${style.close}`}
-                        />
-                    ) : null}
+                <div className={tcls(CONTAINER_STYLE)}>
+                    <div className="relative">
+                        <Tag
+                            href={contentRef?.href ?? ''}
+                            className={tcls(
+                                'flex w-full items-start justify-center overflow-hidden circular-corners:rounded-xl rounded-md straight-corners:rounded-none px-4 py-3 text-neutral-strong text-sm theme-bold:ring-1 theme-gradient:ring-1 ring-inset transition-colors',
+                                style.container,
+                                closeable && 'pr-12',
+                                hasLink && style.hover
+                            )}
+                            insights={
+                                announcement.link
+                                    ? {
+                                          type: 'link_click',
+                                          link: {
+                                              target: announcement.link.to,
+                                              position: SiteInsightsLinkPosition.Announcement,
+                                          },
+                                      }
+                                    : undefined
+                            }
+                        >
+                            <Icon
+                                icon={style.icon as IconName}
+                                className={`mt-0.5 mr-3 size-4 shrink-0 ${style.iconColor}`}
+                            />
+                            <div>
+                                {announcement.message}
+                                {hasLink ? (
+                                    <div className={tcls(LinkStyles, style.link, 'ml-1 inline')}>
+                                        {contentRef?.icon ? (
+                                            <span className="mr-1 ml-2 *:inline">
+                                                {contentRef?.icon}
+                                            </span>
+                                        ) : null}
+                                        {announcement.link?.title && (
+                                            <span className="mr-1">{announcement.link?.title}</span>
+                                        )}
+                                        <Icon
+                                            icon={
+                                                announcement.link?.to.kind === 'url'
+                                                    ? 'arrow-up-right'
+                                                    : 'chevron-right'
+                                            }
+                                            className={tcls('mb-0.5 inline size-3')}
+                                        />
+                                    </div>
+                                ) : null}
+                            </div>
+                        </Tag>
+                        {closeable ? (
+                            <Button
+                                iconOnly
+                                icon="close"
+                                label={tString(language, 'close')}
+                                variant="blank"
+                                size="default"
+                                onClick={dismissAnnouncement}
+                                className={`absolute top-0 right-0 mt-2 mr-2 circular-corners:rounded-lg rounded-sm straight-corners:rounded-none p-1.5 transition-all hover:ring-1 ${style.close}`}
+                            />
+                        ) : null}
+                    </div>
                 </div>
             </div>
         </div>

packages/gitbook/src/components/Cookies/CookiesToast.tsx

@@ -41,7 +41,7 @@ export function CookiesToast(props: { privacyPolicy?: string }) {
             aria-describedby={describedById}
             className={tcls(
                 'fixed',
-                'z-10',
+                'z-50',
                 'bg-tint-base',
                 'rounded-sm',
                 'straight-corners:rounded-none',
@@ -52,9 +52,9 @@ export function CookiesToast(props: { privacyPolicy?: string }) {
                 'depth-flat:shadow-none',
                 'p-4',
                 'pr-8',
-                'bottom-4',
-                'right-4',
-                'left-16',
+                'bottom-[max(env(safe-area-inset-bottom),1rem)]',
+                'right-[max(env(safe-area-inset-right),1rem)]',
+                'left-[max(env(safe-area-inset-left),4rem)]',
                 'max-w-md',
                 'text-balance',
                 'sm:left-auto',

packages/gitbook/src/components/Embeddable/EmbeddableDocsPage.tsx

@@ -79,9 +79,9 @@ export async function EmbeddableDocsPage(
                         orientation="vertical"
                         className="not-hydrated:animate-blur-in-slow"
                         contentClassName="p-4"
-                        fadeEdges={context.sections ? [] : ['leading']}
+                        leading={{ fade: !context.sections, button: true }}
                     >
-                        <TableOfContents className="pt-0" context={context} />
+                        <TableOfContents context={context} />
                         <PageBody
                             context={context}
                             page={page}

packages/gitbook/src/components/Header/Header.tsx

@@ -42,6 +42,7 @@ export function Header(props: {
                 `h-[${HEADER_HEIGHT_DESKTOP}px]`,
                 'sticky',
                 'top-0',
+                'pt-[env(safe-area-inset-top)]',
                 'z-30',
                 'w-full',
                 'flex-none',

packages/gitbook/src/components/Header/HeaderMobileMenu.tsx

@@ -1,16 +1,13 @@
 'use client';
 import { usePathname } from 'next/navigation';
-import { useEffect, useRef, useState } from 'react';
+import { useEffect } from 'react';
 
 import { tString, useLanguage } from '@/intl/client';
 
-import { useScrollListener } from '../hooks/useScrollListener';
 import { Button, type ButtonProps } from '../primitives';
 
 const globalClassName = 'navigation-open';
 
-const SCROLL_DISTANCE = 320;
-
 /**
  * Button to show/hide the table of content on mobile.
  */
@@ -18,25 +15,6 @@ export function HeaderMobileMenu(props: ButtonProps) {
     const language = useLanguage();
 
     const pathname = usePathname();
-    const hasScrollRef = useRef(false);
-
-    const [isOpen, setIsOpen] = useState(false);
-
-    const toggleNavigation = () => {
-        if (!hasScrollRef.current && document.body.classList.contains(globalClassName)) {
-            document.body.classList.remove(globalClassName);
-            setIsOpen(false);
-        } else {
-            document.body.classList.add(globalClassName);
-            window.scrollTo(0, 0);
-            setIsOpen(true);
-        }
-    };
-
-    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(() => {
@@ -50,8 +28,10 @@ export function HeaderMobileMenu(props: ButtonProps) {
             variant="blank"
             size="default"
             label={tString(language, 'table_of_contents_button_label')}
-            onClick={toggleNavigation}
-            active={isOpen}
+            onClick={() => {
+                document.body.classList.toggle(globalClassName);
+            }}
+            // Since the button is hidden behind the TOC after toggling, we don't need to keep track of its active state.
             {...props}
         />
     );

packages/gitbook/src/components/PageAside/PageAside.tsx

@@ -43,6 +43,11 @@ export function PageAside(props: {
                 'opacity-0',
 
                 'xl:flex',
+                'xl:page-no-toc:fixed',
+                'xl:page-no-toc:mr-[max(0px,calc((100vw-96rem)/2-20rem))]',
+                'xl:page-no-toc:right-8',
+                'xl:page-no-toc:bottom-0',
+                'z-20',
 
                 'overflow-hidden',
 
@@ -102,7 +107,7 @@ export function PageAside(props: {
                 className={tcls(
                     'flex flex-col',
                     'min-w-56 shrink-0',
-                    'overflow-hidden',
+                    'page-has-toc:overflow-hidden',
                     'w-full',
                     'xl:max-2xl:rounded-corners:page-api-block:rounded-md',
                     'xl:max-2xl:circular-corners:page-api-block:rounded-xl',
@@ -208,7 +213,7 @@ async function PageAsideFooter(props: { context: GitBookSiteContext }) {
         <div
             className={tcls(
                 'sticky bottom-0 z-10 mt-auto flex flex-col',
-                'bg-tint-base theme-gradient-tint:bg-gradient-tint theme-gradient:bg-gradient-primary theme-muted:bg-tint-subtle [html.sidebar-filled.theme-bold.tint_&]:bg-tint-subtle',
+                // 'bg-tint-base theme-gradient-tint:bg-gradient-tint theme-gradient:bg-gradient-primary theme-muted:bg-tint-subtle [html.sidebar-filled.theme-bold.tint_&]:bg-tint-subtle',
                 'border-tint-subtle xl:max-2xl:page-api-block:border-t xl:max-2xl:page-api-block:p-2',
                 'pt-4'
             )}

packages/gitbook/src/components/PageBody/PageBody.tsx

@@ -74,7 +74,7 @@ export function PageBody(props: {
                     // Allow words to break if they are too long.
                     'break-anywhere',
                     '@container',
-                    pageWidthWide ? 'page-width-wide 3xl:px-8' : 'page-width-default',
+                    pageWidthWide ? 'page-width-wide max-w-[92rem]' : 'page-width-default',
                     siteWidthWide ? 'site-width-wide' : 'site-width-default',
                     page.layout.tableOfContents && hasVisibleTOCItems
                         ? 'page-has-toc'

packages/gitbook/src/components/RootLayout/CustomizationRootLayout.tsx

@@ -57,13 +57,15 @@ function preloadFont(fontData: FontData) {
  * It takes care of setting the theme and the language.
  */
 export async function CustomizationRootLayout(props: {
+    /** The class name to apply to the html element. */
+    htmlClassName?: string;
     /** The class name to apply to the body element. */
-    className?: string;
+    bodyClassName?: string;
     forcedTheme?: CustomizationThemeMode | null;
     context: GitBookAnyContext;
     children: React.ReactNode;
 }) {
-    const { className, context, forcedTheme, children } = props;
+    const { htmlClassName, bodyClassName, context, forcedTheme, children } = props;
     const customization =
         'customization' in context ? context.customization : defaultCustomization();
 
@@ -107,7 +109,8 @@ export async function CustomizationRootLayout(props: {
                 // Set the dark/light class statically to avoid flashing and make it work when JS is disabled
                 (forcedTheme ?? customization.themes.default) === CustomizationThemeMode.Dark
                     ? 'dark'
-                    : ''
+                    : '',
+                htmlClassName
             )}
         >
             <head>
@@ -179,7 +182,7 @@ export async function CustomizationRootLayout(props: {
                     }
                 `}</style>
             </head>
-            <body className={className}>
+            <body className={tcls(bodyClassName, 'sheet-open:overflow-hidden')}>
                 <IconsProvider
                     assetsURL={GITBOOK_ICONS_URL}
                     assetsURLToken={GITBOOK_ICONS_TOKEN}

packages/gitbook/src/components/SiteLayout/SiteLayout.tsx

@@ -101,6 +101,7 @@ export async function generateSiteLayoutViewport(context: GitBookSiteContext): P
         width: 'device-width',
         initialScale: 1,
         maximumScale: 1,
+        viewportFit: 'cover',
     };
 }
 

packages/gitbook/src/components/SiteSections/SiteSectionList.tsx

@@ -40,7 +40,7 @@ export function SiteSectionList(props: { sections: ClientSiteSections; className
                     orientation="vertical"
                     style={{ maxHeight: `${MAX_ITEMS * 3 + 2}rem` }}
                     className="pb-4"
-                    active={currentSection.id}
+                    active={`#${currentSection.id}`}
                 >
                     <div className="flex w-full flex-col px-2">
                         {sectionsAndGroups.map((item) => {

packages/gitbook/src/components/SiteSections/SiteSectionTabs.tsx

@@ -76,8 +76,12 @@ export function SiteSectionTabs(props: {
                         ? 'md:-mr-8 -mr-4 sm:-mr-6'
                         : 'after:contents[] after:absolute after:inset-y-2 after:right-0 after:border-transparent after:border-r after:transition-colors'
                 )}
-                active={currentSection.id}
-                trailingEdgeScrollClassName={children ? 'after:border-tint' : ''}
+                active={`#${currentSection.id}`}
+                trailing={{
+                    fade: true,
+                    button: true,
+                    className: children ? 'after:border-tint' : '',
+                }}
             >
                 <NavigationMenu.List
                     className={tcls(

packages/gitbook/src/components/SpaceLayout/SpaceLayout.tsx

@@ -128,7 +128,7 @@ export function SpaceLayout(props: SpaceLayoutProps) {
                         'lg:justify-center',
                         CONTAINER_STYLE,
                         'site-width-wide:max-w-screen-4xl',
-                        'hydrated:transition-[max-width] duration-300',
+                        'transition-[max-width] duration-300',
 
                         // Ensure the footer is display below the viewport even if the content is not enough
                         withFooter && [
@@ -141,79 +141,82 @@ export function SpaceLayout(props: SpaceLayoutProps) {
                     <TableOfContents
                         context={context}
                         header={
-                            withTopHeader ? null : (
-                                <div
-                                    className={tcls(
-                                        'hidden',
-                                        'pr-4',
-                                        'mt-2',
-                                        'lg:flex',
-                                        'grow-0',
-                                        'dark:shadow-light/1',
-                                        'text-base/tight',
-                                        'items-center'
-                                    )}
-                                >
-                                    <HeaderLogo context={context} />
-                                    {variants.translations.length > 1 ? (
-                                        <TranslationsDropdown
-                                            context={context}
-                                            siteSpace={
-                                                variants.translations.find(
-                                                    (space) => space.id === siteSpace.id
-                                                ) ?? siteSpace
-                                            }
-                                            siteSpaces={variants.translations}
-                                            className="[&_.button-leading-icon]:block! ml-auto py-2 [&_.button-content]:hidden"
-                                        />
-                                    ) : null}
-                                </div>
-                            )
+                            <div
+                                className={tcls(
+                                    'pr-4',
+                                    'flex',
+                                    withTopHeader ? 'lg:hidden' : '',
+                                    'grow-0',
+                                    'dark:shadow-light/1',
+                                    'text-base/tight',
+                                    'items-center'
+                                )}
+                            >
+                                <HeaderLogo context={context} />
+                                {variants.translations.length > 1 ? (
+                                    <TranslationsDropdown
+                                        context={context}
+                                        siteSpace={
+                                            variants.translations.find(
+                                                (space) => space.id === siteSpace.id
+                                            ) ?? siteSpace
+                                        }
+                                        siteSpaces={variants.translations}
+                                        className="[&_.button-leading-icon]:block! ml-auto py-2 [&_.button-content]:hidden"
+                                    />
+                                ) : null}
+                            </div>
                         }
                         // 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.
                         innerHeader={
-                            <>
-                                {!withTopHeader && (
-                                    <div className="flex gap-2">
-                                        <SearchContainer
-                                            style={CustomizationSearchStyle.Subtle}
-                                            withVariants={variants.generic.length > 1}
-                                            withSiteVariants={
-                                                visibleSections?.list.some(
-                                                    (s) =>
-                                                        s.object === 'site-section' &&
-                                                        s.siteSpaces.length > 1
-                                                ) ?? false
-                                            }
-                                            withSections={withSections}
-                                            section={visibleSections?.current}
-                                            siteSpace={siteSpace}
-                                            siteSpaces={visibleSiteSpaces}
-                                            className="max-lg:hidden"
-                                            viewport="desktop"
+                            !withTopHeader || variants.generic.length > 1 ? (
+                                <div
+                                    className={tcls(
+                                        'my-5 sidebar-default:mt-2 flex flex-col gap-2 px-5 empty:hidden',
+                                        variants.generic.length > 1 ? '' : 'max-lg:hidden'
+                                    )}
+                                >
+                                    {!withTopHeader && (
+                                        <div className="flex gap-2 max-lg:hidden">
+                                            <SearchContainer
+                                                style={CustomizationSearchStyle.Subtle}
+                                                withVariants={variants.generic.length > 1}
+                                                withSiteVariants={
+                                                    visibleSections?.list.some(
+                                                        (s) =>
+                                                            s.object === 'site-section' &&
+                                                            s.siteSpaces.length > 1
+                                                    ) ?? false
+                                                }
+                                                withSections={withSections}
+                                                section={visibleSections?.current}
+                                                siteSpace={siteSpace}
+                                                siteSpaces={visibleSiteSpaces}
+                                                viewport="desktop"
+                                            />
+                                        </div>
+                                    )}
+                                    {!withTopHeader && withSections && visibleSections && (
+                                        <SiteSectionList
+                                            className="hidden lg:block"
+                                            sections={encodeClientSiteSections(
+                                                context,
+                                                visibleSections
+                                            )}
                                         />
-                                    </div>
-                                )}
-                                {!withTopHeader && withSections && visibleSections && (
-                                    <SiteSectionList
-                                        className={tcls('hidden', 'lg:block')}
-                                        sections={encodeClientSiteSections(
-                                            context,
-                                            visibleSections
-                                        )}
-                                    />
-                                )}
-                                {variants.generic.length > 1 ? (
-                                    <SpacesDropdown
-                                        context={context}
-                                        siteSpace={siteSpace}
-                                        siteSpaces={variants.generic}
-                                        className="w-full px-3 py-2"
-                                    />
-                                ) : null}
-                            </>
+                                    )}
+                                    {variants.generic.length > 1 ? (
+                                        <SpacesDropdown
+                                            context={context}
+                                            siteSpace={siteSpace}
+                                            siteSpaces={variants.generic}
+                                            className="w-full px-3"
+                                        />
+                                    ) : null}
+                                </div>
+                            ) : null
                         }
                     />
                     {children}

packages/gitbook/src/components/TableOfContents/PageDocumentItem.tsx

@@ -32,7 +32,8 @@ export function PageDocumentItem(props: { page: ClientTOCPageDocument }) {
                                 'my-2',
                                 'border-tint-subtle',
                                 'sidebar-list-default:border-l',
-                                'sidebar-list-line:border-l'
+                                'sidebar-list-line:border-l',
+                                'break-anywhere'
                             )}
                         />
                     ) : null

packages/gitbook/src/components/TableOfContents/PageGroupItem.tsx

@@ -14,9 +14,9 @@ export function PageGroupItem(props: { page: ClientTOCPageGroup; isFirst?: boole
         <li className="flex flex-col">
             <div
                 className={tcls(
-                    '-top-6 sticky z-1 flex items-center gap-3 px-3 pt-6',
+                    '-top-4 sticky z-1 flex items-center gap-3 px-3',
                     'font-semibold text-xs uppercase tracking-wide',
-                    'pb-3', // Add extra padding to make the header fade a bit nicer
+                    'mt-2 pt-4 pb-3', // Add extra padding to make the header fade a bit nicer
                     '-mb-1.5', // Then pull the page items a bit closer, effective bottom padding is 1.5 units / 6px.
                     'mask-[linear-gradient(rgba(0,0,0,1)_70%,rgba(0,0,0,0))]', // Fade out effect of fixed page items. We want the fade to start past the header, this is a good approximation.
                     'bg-tint-base',
@@ -25,9 +25,9 @@ export function PageGroupItem(props: { page: ClientTOCPageGroup; isFirst?: boole
                     '[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',
-                    isFirst ? '-mt-6' : ''
+                    'lg:[html.sidebar-default.theme-gradient_&]:bg-gradient-primary',
+                    'lg:[html.sidebar-default.theme-gradient.tint_&]:bg-gradient-tint',
+                    isFirst ? '-mt-4' : ''
                 )}
             >
                 <TOCPageIcon page={page} />

packages/gitbook/src/components/TableOfContents/TOCScroller.tsx

@@ -1,91 +0,0 @@
-'use client';
-
-import React, {
-    useCallback,
-    useEffect,
-    useMemo,
-    useRef,
-    type ComponentPropsWithoutRef,
-} from 'react';
-import { assert } from 'ts-essentials';
-
-interface TOCScrollContainerContextType {
-    getContainer: (listener: (element: HTMLDivElement) => void) => () => void;
-}
-
-const TOCScrollContainerContext = React.createContext<TOCScrollContainerContextType | null>(null);
-
-function useTOCScrollContainerContext() {
-    const ctx = React.useContext(TOCScrollContainerContext);
-    assert(ctx);
-    return ctx;
-}
-
-/**
- * Table of contents scroll container.
- */
-export function TOCScrollContainer(props: ComponentPropsWithoutRef<'div'>) {
-    const ref = useRef<HTMLDivElement>(null);
-    const listeners = useRef<((element: HTMLDivElement) => void)[]>([]);
-    const getContainer: TOCScrollContainerContextType['getContainer'] = useCallback((listener) => {
-        if (ref.current) {
-            listener(ref.current);
-            return () => {};
-        }
-        listeners.current.push(listener);
-        return () => {
-            listeners.current = listeners.current.filter((l) => l !== listener);
-        };
-    }, []);
-    const value: TOCScrollContainerContextType = useMemo(() => ({ getContainer }), [getContainer]);
-    useEffect(() => {
-        const element = ref.current;
-        if (!element) {
-            return;
-        }
-        listeners.current.forEach((listener) => listener(element));
-        return () => {
-            listeners.current = [];
-        };
-    }, []);
-
-    return (
-        <TOCScrollContainerContext.Provider value={value}>
-            <div ref={ref} data-testid="toc-scroll-container" {...props} />
-        </TOCScrollContainerContext.Provider>
-    );
-}
-
-// Offset to scroll the table of contents item by.
-const TOC_ITEM_OFFSET = 100;
-
-/**
- * Scrolls the table of contents container to the page item when it's initially active.
- */
-export function useScrollToActiveTOCItem(props: {
-    anchorRef: React.RefObject<HTMLAnchorElement | null>;
-    isActive: boolean;
-}) {
-    const { isActive, anchorRef } = props;
-    const { getContainer } = useTOCScrollContainerContext();
-    useEffect(() => {
-        const anchor = anchorRef.current;
-        if (isActive && anchor) {
-            return getContainer((container) => {
-                if (isOutOfView(anchor, container)) {
-                    container.scrollTo({ top: anchor.offsetTop - TOC_ITEM_OFFSET });
-                }
-            });
-        }
-    }, [isActive, getContainer, anchorRef]);
-}
-
-function isOutOfView(element: HTMLElement, container: HTMLElement) {
-    const tocItemTop = element.offsetTop;
-    const containerTop = container.scrollTop;
-    const containerBottom = containerTop + container.clientHeight;
-    return (
-        tocItemTop < containerTop + TOC_ITEM_OFFSET ||
-        tocItemTop > containerBottom - TOC_ITEM_OFFSET
-    );
-}

packages/gitbook/src/components/TableOfContents/TableOfContents.tsx

@@ -3,12 +3,16 @@ import { SiteInsightsTrademarkPlacement } from '@gitbook/api';
 import type React from 'react';
 
 import { tcls } from '@/lib/tailwind';
+import { ScrollContainer } from '../primitives/ScrollContainer';
+import { SideSheet } from '../primitives/SideSheet';
 import { PagesList } from './PagesList';
-import { TOCScrollContainer } from './TOCScroller';
 import { TableOfContentsScript } from './TableOfContentsScript';
 import { Trademark } from './Trademark';
 import { encodeClientTableOfContents } from './encodeClientTableOfContents';
 
+/**
+ * Sidebar container, responsible for setting the right dimensions and position for the sidebar.
+ */
 export async function TableOfContents(props: {
     context: GitBookSiteContext;
     header?: React.ReactNode; // Displayed outside the scrollable TOC as a sticky header
@@ -22,23 +26,38 @@ export async function TableOfContents(props: {
 
     return (
         <>
-            <aside // Sidebar container, responsible for setting the right dimensions and position for the sidebar.
+            <SideSheet
+                side="left"
                 data-testid="table-of-contents"
                 id="table-of-contents"
+                toggleClass="navigation-open"
+                withScrim={true}
+                withCloseButton={true}
                 className={tcls(
-                    'group',
+                    'group/table-of-contents',
                     'text-sm',
 
                     'grow-0',
                     'shrink-0',
-                    'basis-full',
-                    'lg:basis-72',
-                    'lg:page-no-toc:basis-56',
 
-                    'relative',
-                    'z-1',
+                    'w-72',
+                    'lg:max-xl:w-56',
+                    'lg:page-no-toc:w-56',
+                    '4xl:page-no-toc:w-72',
+                    'lg:page-no-toc:fixed',
+                    'lg:page-no-toc:left-8',
+                    'lg:page-no-toc:ml-[max(0px,calc((100vw-96rem)/2-20rem))]',
+
+                    'max-lg:not-sidebar-filled:bg-tint-base',
+                    'max-lg:not-sidebar-filled:border-r',
+                    'border-tint-subtle',
+
+                    'lg:flex!',
+                    'lg:animate-none!',
                     'lg:sticky',
                     'lg:mr-12',
+                    // 'lg:z-0!',
+                    'lg:z-20',
 
                     // Server-side static positioning
                     'lg:top-0',
@@ -60,30 +79,23 @@ export async function TableOfContents(props: {
                     'lg:page-no-toc:[html[style*="--outline-top-offset"]_&]:top-(--outline-top-offset)!',
                     'lg:page-no-toc:[html[style*="--outline-height"]_&]:top-(--outline-height)!',
 
-                    'pt-4',
-                    'pb-4',
+                    'pt-6 pb-4',
                     'lg:sidebar-filled:pr-6',
                     'lg:page-no-toc:pr-0',
 
                     'hidden',
                     'navigation-open:flex!',
                     'lg:flex',
-                    'lg:page-no-toc:hidden',
-                    'xl:page-no-toc:flex',
-                    'lg:site-header-none:page-no-toc:flex',
                     'flex-col',
                     'gap-4',
-
-                    'navigation-open:border-b',
-                    'border-tint-subtle',
                     className
                 )}
             >
-                {header && header}
+                {header ? header : null}
                 <div // The actual sidebar, either shown with a filled bg or transparent.
                     className={tcls(
-                        'lg:-ms-5',
-                        'relative flex grow flex-col overflow-hidden border-tint-subtle',
+                        '-ms-5',
+                        'relative flex min-h-0 grow flex-col border-tint-subtle',
 
                         'sidebar-filled:bg-tint-subtle',
                         'theme-muted:bg-tint-subtle',
@@ -91,6 +103,7 @@ export async function TableOfContents(props: {
                         '[html.sidebar-filled.theme-muted_&]:bg-tint-base',
                         '[html.sidebar-filled.theme-bold.tint_&]:bg-tint-base',
                         '[html.sidebar-filled.theme-gradient_&]:border',
+                        'max-lg:sidebar-filled:border',
                         'page-no-toc:bg-transparent!',
                         'page-no-toc:border-none!',
 
@@ -99,32 +112,33 @@ export async function TableOfContents(props: {
                         'page-has-toc:[html.sidebar-filled.circular-corners_&]:rounded-3xl'
                     )}
                 >
-                    {innerHeader ? (
-                        <div className="my-4 flex flex-col space-y-4 px-5 empty:hidden">
-                            {innerHeader}
-                        </div>
-                    ) : null}
-                    <TOCScrollContainer // The scrollview inside the sidebar
-                        className={tcls(
-                            'flex grow flex-col p-2 pt-4',
-                            customization.trademark.enabled && 'lg:pb-20',
-                            'hide-scrollbar overflow-y-auto'
-                        )}
+                    {innerHeader ? innerHeader : null}
+                    <ScrollContainer
+                        data-testid="toc-scroll-container"
+                        orientation="vertical"
+                        contentClassName="flex flex-col p-2 gutter-stable"
+                        active="[data-active=true]"
+                        leading={{
+                            fade: true,
+                            button: {
+                                className: '-mt-4',
+                            },
+                        }}
                     >
                         <PagesList
                             pages={pages}
                             isRoot={true}
-                            style="page-no-toc:hidden border-tint-subtle sidebar-list-line:border-l"
+                            style="page-no-toc:hidden grow border-tint-subtle sidebar-list-line:border-l"
                         />
-                        {customization.trademark.enabled ? (
-                            <Trademark
-                                context={context}
-                                placement={SiteInsightsTrademarkPlacement.Sidebar}
-                            />
-                        ) : null}
-                    </TOCScrollContainer>
+                    </ScrollContainer>
+                    {customization.trademark.enabled ? (
+                        <Trademark
+                            context={context}
+                            placement={SiteInsightsTrademarkPlacement.Sidebar}
+                        />
+                    ) : null}
                 </div>
-            </aside>
+            </SideSheet>
             <TableOfContentsScript />
         </>
     );

packages/gitbook/src/components/TableOfContents/ToggleableLinkItem.tsx

@@ -8,7 +8,6 @@ import { tcls } from '@/lib/tailwind';
 
 import { useCurrentPagePath } from '../hooks';
 import { Link, type LinkInsightsProps, type LinkProps } from '../primitives';
-import { useScrollToActiveTOCItem } from './TOCScroller';
 
 /**
  * Client component for a page document to toggle its children and be marked as active.
@@ -81,8 +80,6 @@ function LinkItem(
     }
 ) {
     const { isActive, href, insights, children, onActiveClick } = props;
-    const anchorRef = useRef<HTMLAnchorElement>(null);
-    useScrollToActiveTOCItem({ anchorRef, isActive });
 
     const handleClick = (event: React.MouseEvent<HTMLAnchorElement>) => {
         if (isActive && onActiveClick) {
@@ -93,7 +90,7 @@ function LinkItem(
 
     return (
         <Link
-            ref={anchorRef}
+            data-active={isActive}
             href={href}
             insights={insights}
             aria-current={isActive ? 'page' : undefined}

packages/gitbook/src/components/TableOfContents/Trademark.tsx

@@ -19,53 +19,11 @@ export function Trademark(props: {
     return (
         <div
             className={tcls(
-                'relative',
-                'z-2',
-                'lg:absolute',
-
-                'left-0',
-                'right-2',
-                'bottom-0',
-
-                'pointer-events-none',
-                'sidebar-filled:pl-2',
-                'sidebar-filled:pb-2',
-                'sidebar-filled:page-no-toc:p-0',
-
-                'bg-tint-base',
-                'sidebar-filled:bg-tint-subtle',
-                'theme-muted:bg-tint-subtle',
-                '[html.sidebar-filled.theme-muted_&]:bg-tint-base',
-                '[html.sidebar-filled.theme-bold.tint_&]:bg-tint-base',
-
-                'rounded-lg',
-                'straight-corners:rounded-none',
-                'circular-corners:rounded-2xl',
-
-                'before:hidden',
-                'lg:before:block',
-                'before:content-[""]',
-                'before:absolute',
-                'before:inset-x-0',
-                'before:bottom-full',
-                'before:h-8',
-                'before:bg-linear-to-b',
-                'before:from-transparent',
-                'before:to-tint-base',
-                'sidebar-filled:before:to-tint-subtle',
-                'theme-muted:before:to-tint-subtle',
-                '[html.sidebar-filled.theme-bold.tint_&]:before:to-tint-subtle',
-                '[html.sidebar-filled.theme-muted_&]:before:to-tint-base',
-                '[html.sidebar-filled.theme-bold.tint_&]:before:to-tint-base',
-                'page-no-toc:before:to-transparent!',
-
+                'mt-auto circular-corners:rounded-2xl rounded-lg straight-corners:rounded-none px-2 sidebar-default:pr-4 pb-2',
                 className
             )}
         >
-            <TrademarkLink
-                className="circular-corners:rounded-2xl rounded-lg straight-corners:rounded-none"
-                {...rest}
-            />
+            <TrademarkLink {...rest} />
         </div>
     );
 }
@@ -104,12 +62,12 @@ export function TrademarkLink(props: {
 
                 'sidebar-filled:px-3',
                 'lg:sidebar-filled:page-no-toc:px-5',
+                'lg:page-no-toc:bg-tint-base',
 
                 'hover:bg-tint',
                 'hover:text-tint-strong',
 
-                'ring-2',
-                'lg:ring-1',
+                'ring-1',
                 'ring-inset',
                 'ring-tint-subtle',
 

packages/gitbook/src/components/TableOfContents/index.ts

@@ -1,4 +1,3 @@
 export { TableOfContents } from './TableOfContents';
 export { PagesList } from './PagesList';
-export { TOCScrollContainer } from './TOCScroller';
 export { Trademark } from './Trademark';

packages/gitbook/src/components/ThemeToggler/ThemeToggler.tsx

@@ -27,7 +27,11 @@ export function ThemeToggler() {
     };
 
     return (
-        <ButtonGroup role="radiogroup" className="gap-2" combinedShape={false}>
+        <ButtonGroup
+            role="radiogroup"
+            className="xl:page-no-toc:-m-2 gap-2 circular-corners:rounded-full bg-tint-base xl:page-no-toc:p-2"
+            combinedShape={false}
+        >
             <ThemeButton
                 active={mounted && theme === 'light'}
                 icon="sun-bright"
@@ -66,11 +70,7 @@ function ThemeButton(props: {
             aria-checked={active}
             variant="blank"
             size="default"
-            className={
-                active
-                    ? 'bg-primary theme-muted:bg-primary-hover text-primary-strong ring-primary hover:bg-primary contrast-more:text-primary-strong contrast-more:ring-1 [html.sidebar-filled.theme-bold.tint_&]:bg-primary-hover'
-                    : ''
-            }
+            active={active}
             icon={icon}
             iconOnly
         />

packages/gitbook/src/components/layout.ts

@@ -9,9 +9,9 @@ export const HEADER_HEIGHT_DESKTOP = 64 as const;
  * Style for the container to adapt between normal and full width.
  */
 export const CONTAINER_STYLE: ClassValue = [
-    'px-4',
-    'sm:px-6',
-    'md:px-8',
+    'px-4 pl-[max(env(safe-area-inset-left),1rem)] pr-[max(env(safe-area-inset-right),1rem)]',
+    'sm:px-6 sm:pl-[max(env(safe-area-inset-left),1.5rem)] sm:pr-[max(env(safe-area-inset-right),1.5rem)]',
+    'md:px-8 md:pl-[max(env(safe-area-inset-left),2rem)] md:pr-[max(env(safe-area-inset-right),2rem)]',
     'max-w-screen-2xl',
     'mx-auto',
 ];

packages/gitbook/src/components/primitives/HoverCard.tsx

@@ -28,7 +28,7 @@ export function HoverCard(
         <RadixHoverCard.Portal>
             <RadixHoverCard.Content
                 side={props.side ?? 'top'}
-                className="pointer-events-none z-40 w-screen max-w-md animate-scale-in px-4 data-[state='closed']:animate-scale-out sm:w-auto"
+                className="pointer-events-none z-50 w-screen max-w-md animate-scale-in px-4 data-[state='closed']:animate-scale-out sm:w-auto"
             >
                 <div
                     className={tcls(

packages/gitbook/src/components/primitives/ScrollContainer.tsx

@@ -4,7 +4,7 @@ import { tString, useLanguage } from '@/intl/client';
 import { tcls } from '@/lib/tailwind';
 import * as React from 'react';
 import { useScrollListener } from '../hooks/useScrollListener';
-import { Button } from './Button';
+import { Button, type ButtonProps } from './Button';
 
 /**
  * A container that encapsulates a scrollable area with usability features.
@@ -17,17 +17,26 @@ export type ScrollContainerProps = {
     className?: string;
     contentClassName?: string;
 
-    /** Optional class(es) to apply when there the container can be scrolled on the leading (left or top) edge */
-    leadingEdgeScrollClassName?: string;
-
-    /** Optional class(es) to apply when there the container can be scrolled on the trailing (right or bottom) edge */
-    trailingEdgeScrollClassName?: string;
-
     /** The direction of the scroll container. */
     orientation: 'horizontal' | 'vertical';
 
-    /** Whether to fade out the edges of the container. */
-    fadeEdges?: ('leading' | 'trailing')[];
+    leading?: {
+        /** Whether to fade out the leading edge of the container. */
+        fade: boolean;
+        /** Whether to show a button to scroll back. */
+        button: boolean | ButtonProps;
+        /** Optional class(es) to apply when there the container can be scrolled on the leading (left or top) edge */
+        className?: string;
+    };
+
+    trailing?: {
+        /** Whether to fade out the trailing edge of the container. */
+        fade: boolean;
+        /** Whether to show a button to scroll forward. */
+        button: boolean | ButtonProps;
+        /** Optional class(es) to apply when there the container can be scrolled on the trailing (right or bottom) edge */
+        className?: string;
+    };
 
     /** The ID or ref of the active item to scroll to. */
     active?: string | React.RefObject<HTMLElement | null>;
@@ -39,10 +48,9 @@ export function ScrollContainer(props: ScrollContainerProps) {
         className,
         contentClassName,
         orientation,
-        fadeEdges = ['leading', 'trailing'],
         active,
-        leadingEdgeScrollClassName,
-        trailingEdgeScrollClassName,
+        leading = { fade: true, button: true },
+        trailing = { fade: true, button: true },
         ...rest
     } = props;
 
@@ -102,7 +110,9 @@ export function ScrollContainer(props: ScrollContainerProps) {
             return;
         }
         const activeItem =
-            typeof active === 'string' ? document.getElementById(active) : active.current;
+            typeof active === 'string'
+                ? containerRef.current?.querySelector(active)
+                : active.current;
         if (!activeItem || !container.contains(activeItem)) {
             return;
         }
@@ -138,28 +148,30 @@ export function ScrollContainer(props: ScrollContainerProps) {
     return (
         <div
             className={tcls(
-                'group/scroll-container relative flex overflow-hidden',
+                'group/scroll-container relative flex shrink grow',
+                orientation === 'horizontal' ? 'min-w-0' : 'min-h-0',
                 className,
-                scrollPosition > 0 ? leadingEdgeScrollClassName : '',
-                scrollPosition < scrollSize ? trailingEdgeScrollClassName : ''
+                scrollPosition > 0 ? leading?.className : '',
+                scrollPosition < scrollSize ? trailing?.className : ''
             )}
             {...rest}
         >
             {/* Scrollable content */}
             <div
                 className={tcls(
-                    'flex shrink grow',
+                    'flex flex-1 overflow-hidden',
+                    orientation === 'horizontal' ? 'min-w-0' : 'min-h-0',
                     orientation === 'horizontal' ? 'no-scrollbar' : 'hide-scrollbar',
                     orientation === 'horizontal' ? 'overflow-x-scroll' : 'flex-col overflow-y-auto',
-                    fadeEdges.includes('leading') && scrollPosition > 0
+                    leading.fade && scrollPosition > 0
                         ? orientation === 'horizontal'
-                            ? 'mask-l-from-[calc(100%-2rem)]'
-                            : 'mask-t-from-[calc(100%-2rem)]'
+                            ? 'mask-l-from-[calc(100%-1rem)]'
+                            : 'mask-t-from-[calc(100%-1rem)]'
                         : '',
-                    fadeEdges.includes('trailing') && scrollPosition < scrollSize
+                    trailing.fade && scrollPosition < scrollSize
                         ? orientation === 'horizontal'
-                            ? 'mask-r-from-[calc(100%-2rem)]'
-                            : 'mask-b-from-[calc(100%-2rem)]'
+                            ? 'mask-r-from-[calc(100%-1rem)]'
+                            : 'mask-b-from-[calc(100%-1rem)]'
                         : '',
                     contentClassName
                 )}
@@ -169,44 +181,52 @@ export function ScrollContainer(props: ScrollContainerProps) {
             </div>
 
             {/* Scroll buttons back & forward */}
-            <Button
-                icon={orientation === 'horizontal' ? 'chevron-left' : 'chevron-up'}
-                iconOnly
-                size="xsmall"
-                variant="secondary"
-                tabIndex={-1}
-                className={tcls(
-                    'bg-tint-base!',
-                    orientation === 'horizontal'
-                        ? '-translate-y-1/2! top-1/2 left-0 ml-2'
-                        : '-translate-x-1/2! top-0 left-1/2 mt-2',
-                    'absolute not-pointer-none:block hidden scale-0 opacity-0 transition-[scale,opacity]',
-                    scrollPosition > 0
-                        ? 'not-pointer-none:group-hover/scroll-container:scale-100 not-pointer-none:group-hover/scroll-container:opacity-11'
-                        : 'pointer-events-none'
-                )}
-                onClick={scrollBack}
-                label={tString(language, 'scroll_back')}
-            />
-            <Button
-                icon={orientation === 'horizontal' ? 'chevron-right' : 'chevron-down'}
-                iconOnly
-                size="xsmall"
-                variant="secondary"
-                tabIndex={-1}
-                className={tcls(
-                    'bg-tint-base!',
-                    orientation === 'horizontal'
-                        ? '-translate-y-1/2! top-1/2 right-0 mr-2'
-                        : '-translate-x-1/2! bottom-0 left-1/2 mb-2',
-                    'absolute not-pointer-none:block hidden scale-0 transition-[scale,opacity]',
-                    scrollPosition < scrollSize
-                        ? 'not-pointer-none:group-hover/scroll-container:scale-100 not-pointer-none:group-hover/scroll-container:opacity-11'
-                        : 'pointer-events-none'
-                )}
-                onClick={scrollFurther}
-                label={tString(language, 'scroll_further')}
-            />
+            {leading.button !== false ? (
+                <Button
+                    icon={orientation === 'horizontal' ? 'chevron-left' : 'chevron-up'}
+                    iconOnly
+                    size="xsmall"
+                    variant="secondary"
+                    tabIndex={-1}
+                    onClick={scrollBack}
+                    label={tString(language, 'scroll_back')}
+                    {...(typeof leading.button === 'object' ? leading.button : {})}
+                    className={tcls(
+                        'z-10 bg-tint-base!',
+                        orientation === 'horizontal'
+                            ? '-translate-y-1/2! top-1/2 left-0 ml-2'
+                            : '-translate-x-1/2! top-0 left-1/2 mt-2',
+                        'absolute z-10 not-pointer-none:block hidden scale-0 opacity-0 transition-[scale,opacity]',
+                        scrollPosition > 0
+                            ? 'not-pointer-none:group-hover/scroll-container:scale-100 not-pointer-none:group-hover/scroll-container:opacity-11'
+                            : 'pointer-events-none',
+                        typeof leading.button === 'object' ? leading.button.className : ''
+                    )}
+                />
+            ) : null}
+            {trailing.button !== false ? (
+                <Button
+                    icon={orientation === 'horizontal' ? 'chevron-right' : 'chevron-down'}
+                    iconOnly
+                    size="xsmall"
+                    variant="secondary"
+                    tabIndex={-1}
+                    onClick={scrollFurther}
+                    label={tString(language, 'scroll_further')}
+                    {...(typeof trailing.button === 'object' ? trailing.button : {})}
+                    className={tcls(
+                        'z-10 bg-tint-base!',
+                        orientation === 'horizontal'
+                            ? '-translate-y-1/2! top-1/2 right-0 mr-2'
+                            : '-translate-x-1/2! bottom-0 left-1/2 mb-2',
+                        'absolute z-10 not-pointer-none:block hidden scale-0 transition-[scale,opacity]',
+                        scrollPosition < scrollSize
+                            ? 'not-pointer-none:group-hover/scroll-container:scale-100 not-pointer-none:group-hover/scroll-container:opacity-11'
+                            : 'pointer-events-none',
+                        typeof trailing.button === 'object' ? trailing.button.className : ''
+                    )}
+                />
+            ) : null}
         </div>
     );
 }
@@ -214,7 +234,7 @@ export function ScrollContainer(props: ScrollContainerProps) {
 /**
  * Scroll to an element in a container.
  */
-function scrollToElementInContainer(element: HTMLElement, container: HTMLElement) {
+function scrollToElementInContainer(element: Element, container: HTMLElement) {
     const containerRect = container.getBoundingClientRect();
     const rect = element.getBoundingClientRect();
 
@@ -229,6 +249,6 @@ function scrollToElementInContainer(element: HTMLElement, container: HTMLElement
             (rect.left - containerRect.left) -
             container.clientWidth / 2 +
             rect.width / 2,
-        behavior: 'smooth',
+        behavior: 'auto',
     });
 }

packages/gitbook/src/components/primitives/SideSheet.tsx

@@ -0,0 +1,194 @@
+'use client';
+
+import { useLanguage } from '@/intl/client';
+import { tString } from '@/intl/translate';
+import { type ClassValue, tcls } from '@/lib/tailwind';
+import React from 'react';
+import { useIsMobile } from '../hooks/useIsMobile';
+import { Button } from './Button';
+
+/**
+ * SideSheet - A slide-in panel component that can appear from the left or right side.
+ *
+ * Supports both controlled and uncontrolled modes:
+ * - Controlled: Provide both `open` and `onOpenChange` props. Parent manages state.
+ * - Uncontrolled: Omit `open` prop. Component manages its own state internally.
+ */
+export function SideSheet(
+    props: {
+        /** Which side the sheet slides in from */
+        side: 'left' | 'right';
+        /**
+         * Optional CSS class to monitor and sync with `document.body.classList`.
+         * When set, a MutationObserver watches for the class and syncs the sheet state accordingly.
+         * Adding this class opens the sheet, removing it closes it.
+         * Works in both controlled and uncontrolled modes.
+         */
+        toggleClass?: string;
+        /**
+         * Modal behavior: true (always modal), false (never modal), or 'mobile' (modal only on mobile).
+         * Defaults to 'mobile'.
+         */
+        modal?: true | false | 'mobile';
+        /**
+         * Controls visibility. If provided, component is controlled (parent manages state).
+         * If undefined, component is uncontrolled (manages its own state).
+         */
+        open?: boolean;
+        /** Called when the open state changes. Receives the new state (true/false). Only used in controlled mode. */
+        onOpenChange?: (open: boolean) => void;
+        /** Show a backdrop overlay when modal */
+        withScrim?: boolean;
+        /** Show a close button when modal */
+        withCloseButton?: boolean;
+    } & React.HTMLAttributes<HTMLDivElement>
+) {
+    const {
+        side,
+        children,
+        className,
+        toggleClass,
+        open: openState,
+        modal = 'mobile',
+        withScrim,
+        withCloseButton,
+        onOpenChange,
+        ...rest
+    } = props;
+
+    const isMobile = useIsMobile();
+    const isModal = modal === 'mobile' ? isMobile : modal;
+
+    // Internal state for uncontrolled mode (only used when open prop is undefined)
+    const [open, setOpen] = React.useState(openState ?? false);
+
+    // Determine actual open state: controlled (from prop) or uncontrolled (from internal state)
+    const isOpen = openState !== undefined ? openState : open;
+
+    const handleClose = React.useCallback(() => {
+        if (openState !== undefined) {
+            // Controlled mode: parent manages state, notify via callback with new state
+            onOpenChange?.(false);
+        } else {
+            // Uncontrolled mode: update internal state and sync body class if needed
+            setOpen(false);
+            if (toggleClass) {
+                document.body.classList.remove(toggleClass);
+            }
+        }
+    }, [openState, onOpenChange, toggleClass]);
+
+    // Sync the sheet state with the body class if the toggleClass is set
+    React.useEffect(() => {
+        if (!toggleClass) {
+            return;
+        }
+
+        const callback = (mutationList: MutationRecord[]) => {
+            for (const mutation of mutationList) {
+                if (mutation.attributeName === 'class') {
+                    const shouldBeOpen = document.body.classList.contains(toggleClass);
+                    if (openState !== undefined) {
+                        // Controlled mode: sync with parent's state
+                        // Notify parent of state change via onOpenChange
+                        if (shouldBeOpen !== openState) {
+                            onOpenChange?.(shouldBeOpen);
+                        }
+                    } else {
+                        // Uncontrolled mode: sync internal state with body class
+                        setOpen(shouldBeOpen);
+                    }
+                }
+            }
+        };
+
+        const observer = new MutationObserver(callback);
+        observer.observe(document.body, { attributes: true });
+
+        return () => observer.disconnect();
+    }, [toggleClass, openState, onOpenChange]);
+
+    return (
+        <>
+            {withScrim ? (
+                <SideSheetScrim
+                    className={tcls(isModal && isOpen ? '' : 'hidden opacity-0 backdrop-blur-none')}
+                    onClick={handleClose}
+                />
+            ) : null}
+
+            <aside
+                className={tcls(
+                    'side-sheet',
+                    isOpen
+                        ? side === 'left'
+                            ? 'hydrated:animate-enter-from-left'
+                            : 'hydrated:animate-enter-from-right'
+                        : side === 'left'
+                          ? 'hydrated:animate-exit-to-left'
+                          : 'hydrated:animate-exit-to-right',
+                    'fixed inset-y-0 z-41', // Above the side sheet scrim on z-40
+                    side === 'left' ? 'left-0' : 'right-0',
+                    withCloseButton ? 'max-w-[calc(100vw-5rem)]' : 'max-w-[calc(100vw-3rem)]',
+                    isOpen ? '' : 'hidden',
+                    className
+                )}
+                aria-expanded={isOpen}
+                aria-modal={isModal}
+                {...rest}
+            >
+                {children}
+                {withCloseButton ? (
+                    <SideSheetCloseButton
+                        className={tcls(
+                            side === 'left' ? 'left-full ml-4' : 'right-full mr-4',
+                            isModal && isOpen ? 'animate-blur-in' : 'hidden animate-blur-out'
+                        )}
+                        onClick={handleClose}
+                    />
+                ) : null}
+            </aside>
+        </>
+    );
+}
+
+/** Backdrop overlay shown behind the modal sheet */
+export function SideSheetScrim(props: { className?: ClassValue; onClick?: () => void }) {
+    const { className, onClick } = props;
+    return (
+        <div
+            id="side-sheet-scrim"
+            onClick={() => {
+                onClick?.();
+            }}
+            onKeyUp={(e) => {
+                if (e.key === 'Escape') {
+                    onClick?.();
+                }
+            }}
+            className={tcls(
+                'fixed inset-0 z-40 items-start bg-tint-base/3 not-hydrated:opacity-0 starting:opacity-0 backdrop-blur-md starting:backdrop-blur-none transition-[opacity,display,backdrop-filter] transition-discrete duration-250 dark:bg-tint-base/6',
+                className
+            )}
+        />
+    );
+}
+
+/** Close button displayed outside the sheet when modal */
+export function SideSheetCloseButton(props: { className?: ClassValue; onClick?: () => void }) {
+    const { className, onClick } = props;
+    const language = useLanguage();
+    return (
+        <Button
+            icon="xmark"
+            variant="secondary"
+            size="default"
+            iconOnly
+            label={tString(language, 'close')}
+            className={tcls('absolute top-4 bg-tint-base! transition-discrete', className)}
+            onClick={() => {
+                onClick?.();
+            }}
+        />
+    );
+}

packages/gitbook/tailwind.config.ts

@@ -328,10 +328,10 @@ const config: Config = {
                 blurOut: 'blurOut 200ms ease-in both',
                 'blurOut-slow': 'blurOut 500ms ease-in both',
 
-                enterFromLeft: 'enterFromLeft 250ms cubic-bezier(0.83, 0, 0.17, 1) both',
-                enterFromRight: 'enterFromRight 250ms cubic-bezier(0.83, 0, 0.17, 1) both',
-                exitToLeft: 'exitToLeft 250ms cubic-bezier(0.83, 0, 0.17, 1) both',
-                exitToRight: 'exitToRight 250ms cubic-bezier(0.83, 0, 0.17, 1) both',
+                enterFromLeft: 'enterFromLeft 300ms cubic-bezier(0.83, 0, 0.17, 1) both',
+                enterFromRight: 'enterFromRight 300ms cubic-bezier(0.83, 0, 0.17, 1) both',
+                exitToLeft: 'exitToLeft 300ms cubic-bezier(0.83, 0, 0.17, 1) both',
+                exitToRight: 'exitToRight 300ms cubic-bezier(0.83, 0, 0.17, 1) both',
 
                 heightIn: 'heightIn 200ms ease both',
                 crawl: 'crawl 2s ease-in-out infinite',
@@ -474,18 +474,18 @@ const config: Config = {
                 },
                 enterFromRight: {
                     from: { opacity: '0', transform: 'translateX(50%)', display: 'none' },
-                    to: { opacity: '1', transform: 'translateX(0)', display: 'block' },
+                    to: { opacity: '1', transform: 'translateX(0)', display: 'inherit' },
                 },
                 enterFromLeft: {
                     from: { opacity: '0', transform: 'translateX(-50%)', display: 'none' },
-                    to: { opacity: '1', transform: 'translateX(0)', display: 'block' },
+                    to: { opacity: '1', transform: 'translateX(0)', display: 'inherit' },
                 },
                 exitToRight: {
-                    from: { opacity: '1', transform: 'translateX(0)', display: 'block' },
+                    from: { opacity: '1', transform: 'translateX(0)', display: 'inherit' },
                     to: { opacity: '0', transform: 'translateX(50%)', display: 'none' },
                 },
                 exitToLeft: {
-                    from: { opacity: '1', transform: 'translateX(0)', display: 'block' },
+                    from: { opacity: '1', transform: 'translateX(0)', display: 'inherit' },
                     to: { opacity: '0', transform: 'translateX(-50%)', display: 'none' },
                 },
                 scaleIn: {
@@ -576,7 +576,11 @@ const config: Config = {
              * Variant when the Table of Content navigation is open.
              */
             addVariant('navigation-open', 'body.navigation-open &');
-            addVariant('chat-open', 'body:has(.ai-chat:not(.hidden)) &');
+            addVariant('chat-open', 'body:has(.ai-chat[aria-expanded="true"]) &');
+            addVariant(
+                'sheet-open',
+                'html:has(.side-sheet[aria-modal="true"][aria-expanded="true"]) &, &:has(.side-sheet[aria-modal="true"][aria-expanded="true"])'
+            );
 
             /**
              * Variant when a header is displayed.