diff --git a/backend/Cargo.lock b/backend/Cargo.lock
index 09b01fa..d3813f7 100644
--- a/backend/Cargo.lock
+++ b/backend/Cargo.lock
@@ -1470,7 +1470,7 @@ checksum = "c41e0c4fef86961ac6d6f8a82609f55f31b05e4fce149ac5710e439df7619ba4"
 
 [[package]]
 name = "mangalord"
-version = "0.59.0"
+version = "0.60.0"
 dependencies = [
  "anyhow",
  "argon2",
diff --git a/backend/Cargo.toml b/backend/Cargo.toml
index 83607b3..abb8d58 100644
--- a/backend/Cargo.toml
+++ b/backend/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mangalord"
-version = "0.59.0"
+version = "0.60.0"
 edition = "2021"
 default-run = "mangalord"
 
diff --git a/frontend/e2e/mobile-account-library.spec.ts b/frontend/e2e/mobile-account-library.spec.ts
new file mode 100644
index 0000000..04d562e
--- /dev/null
+++ b/frontend/e2e/mobile-account-library.spec.ts
@@ -0,0 +1,244 @@
+import { test, expect, type Page } from '@playwright/test';
+
+// Phase 5: Account becomes an inset-grouped hub on mobile (Profile /
+// Preferences / Change password + red Log out at the bottom) and
+// /library hosts a SegmentedControl over Bookmarks / Collections /
+// History. Profile-layout horizontal tabs are hidden on mobile. Desktop
+// is unchanged.
+
+const MOBILE = { width: 390, height: 844 } as const;
+const DESKTOP = { width: 1280, height: 720 } as const;
+
+async function mockSession(
+    page: Page,
+    opts: { authed?: boolean; logoutCalls?: { count: number } } = {}
+) {
+    const authed = opts.authed ?? false;
+    await page.route('**/api/v1/auth/config', (route) =>
+        route.fulfill({
+            status: 200,
+            contentType: 'application/json',
+            body: JSON.stringify({ self_register_enabled: true, private_mode: false })
+        })
+    );
+    await page.route('**/api/v1/auth/me', (route) =>
+        route.fulfill({
+            status: authed ? 200 : 401,
+            contentType: 'application/json',
+            body: authed
+                ? JSON.stringify({
+                      user: {
+                          id: 'u1',
+                          username: 'fabian',
+                          created_at: '2026-01-05T00:00:00Z',
+                          is_admin: false
+                      }
+                  })
+                : JSON.stringify({
+                      error: { code: 'unauthenticated', message: 'unauthenticated' }
+                  })
+        })
+    );
+    await page.route('**/api/v1/auth/me/preferences', (route) =>
+        route.fulfill({
+            status: authed ? 200 : 401,
+            contentType: 'application/json',
+            body: authed
+                ? JSON.stringify({
+                      reader_mode: 'single',
+                      reader_page_gap: 'none',
+                      updated_at: '2026-01-05T00:00:00Z'
+                  })
+                : JSON.stringify({ error: { code: 'x', message: 'x' } })
+        })
+    );
+    await page.route('**/api/v1/auth/logout', (route) => {
+        if (opts.logoutCalls) opts.logoutCalls.count += 1;
+        return route.fulfill({ status: 204, body: '' });
+    });
+}
+
+async function mockLibraryData(page: Page, opts: { authed?: boolean } = {}) {
+    const status = opts.authed ? 200 : 401;
+    const emptyPage = JSON.stringify({
+        items: [],
+        page: { limit: 50, offset: 0, total: 0 }
+    });
+    const unauth = JSON.stringify({
+        error: { code: 'unauthenticated', message: 'unauthenticated' }
+    });
+    await page.route('**/api/v1/me/bookmarks*', (route) =>
+        route.fulfill({
+            status,
+            contentType: 'application/json',
+            body: opts.authed ? emptyPage : unauth
+        })
+    );
+    await page.route('**/api/v1/me/collections*', (route) =>
+        route.fulfill({
+            status,
+            contentType: 'application/json',
+            body: opts.authed ? emptyPage : unauth
+        })
+    );
+    await page.route('**/api/v1/me/read-progress*', (route) =>
+        route.fulfill({
+            status,
+            contentType: 'application/json',
+            body: opts.authed ? emptyPage : unauth
+        })
+    );
+}
+
+test.describe('mobile library', () => {
+    test('phone viewport: BottomNav Library tab navigates to /library', async ({
+        page
+    }) => {
+        await mockSession(page);
+        await mockLibraryData(page);
+        await page.route('**/api/v1/mangas*', (route) =>
+            route.fulfill({
+                status: 200,
+                contentType: 'application/json',
+                body: JSON.stringify({
+                    items: [],
+                    page: { limit: 50, offset: 0, total: 0 }
+                })
+            })
+        );
+        await page.setViewportSize(MOBILE);
+        await page.goto('/');
+
+        await page.getByTestId('bottom-nav-library').click();
+        await expect(page).toHaveURL(/\/library$/);
+        await expect(page.getByTestId('library-tabs')).toBeVisible();
+    });
+
+    test('phone viewport: SegmentedControl swaps Library sub-tabs and updates ?tab=', async ({
+        page
+    }) => {
+        await mockSession(page, { authed: true });
+        await mockLibraryData(page, { authed: true });
+        await page.setViewportSize(MOBILE);
+        await page.goto('/library');
+
+        // Default sub-tab is bookmarks — URL has no `tab=` param.
+        await expect(page).toHaveURL(/\/library$/);
+        await expect(page.getByTestId('library-bookmarks-empty')).toBeVisible();
+
+        await page
+            .getByTestId('library-tabs')
+            .getByRole('radio', { name: 'Collections' })
+            .click();
+        await expect(page).toHaveURL(/\?tab=collections$/);
+        await expect(page.getByTestId('library-collections-empty')).toBeVisible();
+
+        await page
+            .getByTestId('library-tabs')
+            .getByRole('radio', { name: 'History' })
+            .click();
+        await expect(page).toHaveURL(/\?tab=history$/);
+        await expect(page.getByTestId('library-history-empty')).toBeVisible();
+
+        // Returning to Bookmarks clears the param entirely.
+        await page
+            .getByTestId('library-tabs')
+            .getByRole('radio', { name: 'Bookmarks' })
+            .click();
+        await expect(page).toHaveURL(/\/library$/);
+    });
+
+    test('phone viewport on /library unauth: sign-in prompt, no list', async ({
+        page
+    }) => {
+        await mockSession(page);
+        await mockLibraryData(page);
+        await page.setViewportSize(MOBILE);
+        await page.goto('/library');
+
+        await expect(page.getByTestId('library-signin')).toBeVisible();
+        await expect(page.getByTestId('library-bookmarks-empty')).toHaveCount(0);
+    });
+});
+
+test.describe('mobile account hub', () => {
+    test('phone viewport authed: inset-grouped hub renders with profile / preferences / change-password / logout rows', async ({
+        page
+    }) => {
+        await mockSession(page, { authed: true });
+        await page.setViewportSize(MOBILE);
+        await page.goto('/profile/account');
+
+        await expect(page.getByTestId('account-hub')).toBeVisible();
+        await expect(page.getByTestId('account-username')).toHaveText('fabian');
+        await expect(page.getByTestId('account-row-profile')).toBeVisible();
+        await expect(page.getByTestId('account-row-preferences')).toBeVisible();
+        await expect(page.getByTestId('account-row-change-password')).toBeVisible();
+        await expect(page.getByTestId('account-row-logout')).toBeVisible();
+        // Desktop card MUST not render — only the hub view is active
+        // on mobile so we don't double-up the password form testids.
+        await expect(page.getByTestId('account-desktop-card')).toHaveCount(0);
+    });
+
+    test('phone viewport authed: Change password row opens the bottom sheet', async ({
+        page
+    }) => {
+        await mockSession(page, { authed: true });
+        await page.setViewportSize(MOBILE);
+        await page.goto('/profile/account');
+
+        await expect(page.getByTestId('password-sheet')).toBeHidden();
+        await page.getByTestId('account-row-change-password').click();
+        await expect(page.getByTestId('password-sheet')).toBeVisible();
+        await expect(
+            page.getByTestId('password-sheet').getByTestId('current-password')
+        ).toBeVisible();
+    });
+
+    test('phone viewport authed: Log out row fires /auth/logout and routes to /login', async ({
+        page
+    }) => {
+        const logoutCalls = { count: 0 };
+        await mockSession(page, { authed: true, logoutCalls });
+        await page.setViewportSize(MOBILE);
+        await page.goto('/profile/account');
+
+        await page.getByTestId('account-row-logout').click();
+
+        await expect(page).toHaveURL(/\/login$/);
+        expect(logoutCalls.count).toBe(1);
+    });
+
+    test('phone viewport unauth: sign-in CTA, no hub', async ({ page }) => {
+        await mockSession(page);
+        await page.setViewportSize(MOBILE);
+        await page.goto('/profile/account');
+
+        await expect(page.getByTestId('account-signin')).toBeVisible();
+        await expect(page.getByTestId('account-hub')).toHaveCount(0);
+    });
+
+    test('phone viewport authed: profile horizontal tabs are hidden', async ({
+        page
+    }) => {
+        await mockSession(page, { authed: true });
+        await page.setViewportSize(MOBILE);
+        await page.goto('/profile/account');
+
+        await expect(page.getByTestId('tab-account')).toBeHidden();
+    });
+
+    test('desktop viewport authed: existing password card visible, hub is not', async ({
+        page
+    }) => {
+        await mockSession(page, { authed: true });
+        await page.setViewportSize(DESKTOP);
+        await page.goto('/profile/account');
+
+        await expect(page.getByTestId('account-desktop-card')).toBeVisible();
+        await expect(page.getByTestId('password-form')).toBeVisible();
+        await expect(page.getByTestId('account-hub')).toHaveCount(0);
+        // Desktop profile tabs remain.
+        await expect(page.getByTestId('tab-account')).toBeVisible();
+    });
+});
diff --git a/frontend/e2e/mobile-chrome.spec.ts b/frontend/e2e/mobile-chrome.spec.ts
index 0cc9ff8..7036150 100644
--- a/frontend/e2e/mobile-chrome.spec.ts
+++ b/frontend/e2e/mobile-chrome.spec.ts
@@ -63,13 +63,34 @@ test.describe('mobile chrome', () => {
         await expect(home).toHaveAttribute('aria-current', 'page');
     });
 
-    test('phone viewport: tapping Library navigates to /bookmarks and marks itself active', async ({ page }) => {
+    test('phone viewport: tapping Library navigates to /library and marks itself active', async ({ page }) => {
         await mockAnonymous(page);
+        await page.route('**/api/v1/me/bookmarks*', (route) =>
+            route.fulfill({
+                status: 401,
+                contentType: 'application/json',
+                body: JSON.stringify({ error: { code: 'x', message: 'x' } })
+            })
+        );
+        await page.route('**/api/v1/me/collections*', (route) =>
+            route.fulfill({
+                status: 401,
+                contentType: 'application/json',
+                body: JSON.stringify({ error: { code: 'x', message: 'x' } })
+            })
+        );
+        await page.route('**/api/v1/me/read-progress*', (route) =>
+            route.fulfill({
+                status: 401,
+                contentType: 'application/json',
+                body: JSON.stringify({ error: { code: 'x', message: 'x' } })
+            })
+        );
         await page.setViewportSize(MOBILE);
         await page.goto('/');
 
         await page.getByTestId('bottom-nav-library').click();
-        await expect(page).toHaveURL(/\/bookmarks$/);
+        await expect(page).toHaveURL(/\/library$/);
         await expect(page.getByTestId('bottom-nav-library')).toHaveAttribute('aria-current', 'page');
     });
 
diff --git a/frontend/package.json b/frontend/package.json
index 432228f..aeaba1c 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -1,6 +1,6 @@
 {
   "name": "mangalord-frontend",
-  "version": "0.59.0",
+  "version": "0.60.0",
   "private": true,
   "type": "module",
   "scripts": {
diff --git a/frontend/src/routes/+layout.svelte b/frontend/src/routes/+layout.svelte
index 57de468..391944d 100644
--- a/frontend/src/routes/+layout.svelte
+++ b/frontend/src/routes/+layout.svelte
@@ -39,6 +39,7 @@
         '/upload': 'Mangalord | Upload',
         '/bookmarks': 'Mangalord | Bookmarks',
         '/collections': 'Mangalord | Collections',
+        '/library': 'Mangalord | Library',
         '/profile': 'Mangalord | Profile',
         '/profile/account': 'Mangalord | Account',
         '/profile/bookmarks': 'Mangalord | Bookmarks',
@@ -53,19 +54,21 @@
 
     const layoutTitle = $derived(STATIC_TITLES[$page.route?.id ?? ''] ?? 'Mangalord');
 
-    // Mobile bottom-nav tabs. Library consolidates Bookmarks / Collections /
-    // History — it currently links to /bookmarks as the closest existing
-    // route; Phase 5 introduces /library with internal segmented sub-tabs
-    // and this href flips at that point. Browse temporarily shares Home's
-    // destination until the curated-feed split lands.
+    // Mobile bottom-nav tabs. Library is now its own wrapper at /library
+    // (Phase 5) hosting a SegmentedControl over Bookmarks / Collections /
+    // History; the older top-level /bookmarks + /collections routes stay
+    // active for desktop users and as deep-link targets, so they remain
+    // in the `match` set. Browse temporarily shares Home's destination
+    // until the curated-feed split lands.
     const MOBILE_TABS: BottomNavTab[] = [
         { label: 'Home', href: '/', icon: House, match: [] },
         { label: 'Browse', href: '/', icon: Search, match: [] },
         {
             label: 'Library',
-            href: '/bookmarks',
+            href: '/library',
             icon: BookOpen,
             match: [
+                '/library',
                 '/bookmarks',
                 '/collections',
                 '/profile/bookmarks',
diff --git a/frontend/src/routes/library/+page.svelte b/frontend/src/routes/library/+page.svelte
new file mode 100644
index 0000000..3d87dd6
--- /dev/null
+++ b/frontend/src/routes/library/+page.svelte
@@ -0,0 +1,219 @@
+<script lang="ts">
+    import { page } from '$app/stores';
+    import { goto } from '$app/navigation';
+    import { fileUrl } from '$lib/api/client';
+    import { chapterLabel } from '$lib/api/chapters';
+    import SegmentedControl from '$lib/components/SegmentedControl.svelte';
+    import BookmarkList from '$lib/components/BookmarkList.svelte';
+    import CollectionsGrid from '$lib/components/CollectionsGrid.svelte';
+    import BookImage from '@lucide/svelte/icons/book-image';
+
+    let { data } = $props();
+
+    type Tab = 'bookmarks' | 'collections' | 'history';
+    const TABS: { label: string; value: Tab }[] = [
+        { label: 'Bookmarks', value: 'bookmarks' },
+        { label: 'Collections', value: 'collections' },
+        { label: 'History', value: 'history' }
+    ];
+
+    // `?tab=` is the source of truth — refreshing or sharing a link
+    // lands the user back on the same sub-tab. Bookmarks is the
+    // default so visiting /library bare doesn't add noise to the URL.
+    const activeTab: Tab = $derived.by(() => {
+        const t = $page.url.searchParams.get('tab');
+        return t === 'collections' || t === 'history' ? t : 'bookmarks';
+    });
+
+    function setTab(t: Tab) {
+        // goto with `replaceState: true` reliably updates the $page
+        // store so the activeTab $derived re-fires. `replaceState`
+        // alone (the shallow-routing helper) doesn't always trip the
+        // url-tracked dependency, leaving the view stuck on the
+        // previous sub-tab.
+        const url = new URL($page.url);
+        if (t === 'bookmarks') url.searchParams.delete('tab');
+        else url.searchParams.set('tab', t);
+        void goto(url.toString(), {
+            replaceState: true,
+            keepFocus: true,
+            noScroll: true
+        });
+    }
+</script>
+
+<svelte:head>
+    <title>Mangalord | Library</title>
+</svelte:head>
+
+<h1 class="library-heading">Library</h1>
+
+<div class="tab-row">
+    <SegmentedControl
+        ariaLabel="Library section"
+        value={activeTab}
+        options={TABS}
+        onchange={setTab}
+        testid="library-tabs"
+    />
+</div>
+
+{#if !data.authenticated}
+    <p class="hint" data-testid="library-signin">
+        <a href="/login?next=/library">Sign in</a> to see your library.
+    </p>
+{:else if data.error}
+    <p class="error" role="alert" data-testid="library-error">
+        Couldn't load library: {data.error}
+    </p>
+{:else if activeTab === 'bookmarks'}
+    {#if data.bookmarks.length === 0}
+        <p class="hint" data-testid="library-bookmarks-empty">No bookmarks yet.</p>
+    {:else}
+        <BookmarkList bookmarks={data.bookmarks} testid="library-bookmark-list" />
+    {/if}
+{:else if activeTab === 'collections'}
+    {#if data.collections.length === 0}
+        <p class="hint" data-testid="library-collections-empty">
+            You don't have any collections yet. Open any manga and use
+            <strong>Add to collection</strong> to start one.
+        </p>
+    {:else}
+        <CollectionsGrid collections={data.collections} />
+    {/if}
+{:else if data.history.length === 0}
+    <p class="hint" data-testid="library-history-empty">
+        Nothing here yet — open any manga and a row will land here once you turn
+        a page.
+    </p>
+{:else}
+    <ul class="history-list" data-testid="library-history-list">
+        {#each data.history as p (p.manga_id)}
+            <li class="history-row">
+                <a
+                    href={p.chapter_id != null
+                        ? `/manga/${p.manga_id}/chapter/${p.chapter_id}`
+                        : `/manga/${p.manga_id}`}
+                    class="cover-link"
+                    aria-hidden="true"
+                    tabindex="-1"
+                >
+                    {#if p.manga_cover_image_path}
+                        <img
+                            src={fileUrl(p.manga_cover_image_path)}
+                            alt=""
+                            class="cover"
+                            loading="lazy"
+                        />
+                    {:else}
+                        <div class="cover cover-placeholder">
+                            <BookImage size={18} aria-hidden="true" />
+                        </div>
+                    {/if}
+                </a>
+                <div class="meta">
+                    <a href="/manga/{p.manga_id}" class="title">{p.manga_title}</a>
+                    {#if p.chapter_id != null && p.chapter_number != null}
+                        <a
+                            class="target"
+                            href="/manga/{p.manga_id}/chapter/{p.chapter_id}"
+                        >
+                            Continue {chapterLabel({
+                                number: p.chapter_number,
+                                title: null
+                            })}{#if p.page > 1} — page {p.page}{/if}
+                        </a>
+                    {/if}
+                </div>
+            </li>
+        {/each}
+    </ul>
+{/if}
+
+<style>
+    .library-heading {
+        margin-bottom: var(--space-3);
+    }
+
+    .tab-row {
+        margin-bottom: var(--space-4);
+        display: flex;
+    }
+
+    .tab-row :global(.segmented) {
+        width: 100%;
+    }
+
+    .tab-row :global(.seg) {
+        flex: 1;
+    }
+
+    .hint {
+        color: var(--text-muted);
+    }
+
+    .error {
+        color: var(--danger);
+    }
+
+    .history-list {
+        list-style: none;
+        padding: 0;
+        margin: 0;
+        display: flex;
+        flex-direction: column;
+        gap: var(--space-3);
+    }
+
+    .history-row {
+        display: grid;
+        grid-template-columns: 56px 1fr;
+        gap: var(--space-3);
+        align-items: center;
+    }
+
+    .cover-link {
+        display: block;
+        line-height: 0;
+    }
+
+    .cover {
+        width: 56px;
+        aspect-ratio: 2 / 3;
+        object-fit: cover;
+        border-radius: var(--radius-sm);
+        background: var(--surface);
+    }
+
+    .cover-placeholder {
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        color: var(--text-muted);
+    }
+
+    .meta {
+        display: flex;
+        flex-direction: column;
+        gap: var(--space-1);
+        min-width: 0;
+    }
+
+    .title {
+        font-weight: var(--weight-semibold);
+        color: var(--text);
+        overflow: hidden;
+        text-overflow: ellipsis;
+        white-space: nowrap;
+    }
+
+    .title:hover {
+        color: var(--primary);
+        text-decoration: none;
+    }
+
+    .target {
+        font-size: var(--font-sm);
+        color: var(--primary);
+    }
+</style>
diff --git a/frontend/src/routes/library/+page.ts b/frontend/src/routes/library/+page.ts
new file mode 100644
index 0000000..14d17d5
--- /dev/null
+++ b/frontend/src/routes/library/+page.ts
@@ -0,0 +1,44 @@
+import { ApiError } from '$lib/api/client';
+import { listMyBookmarks } from '$lib/api/bookmarks';
+import { listMyCollections } from '$lib/api/collections';
+import { listMyReadProgress } from '$lib/api/read_progress';
+import type { PageLoad } from './$types';
+
+export const ssr = false;
+
+/**
+ * Loads bookmarks + collections + reading-history in one shot so the
+ * Library segmented control can swap between sub-tabs without firing a
+ * second round trip per tap. 401 → unauthenticated path; the page
+ * surfaces a sign-in prompt and renders empty lists.
+ */
+export const load: PageLoad = async () => {
+    const empty = {
+        authenticated: true,
+        bookmarks: [] as Awaited<ReturnType<typeof listMyBookmarks>>['items'],
+        collections: [] as Awaited<ReturnType<typeof listMyCollections>>['items'],
+        history: [] as Awaited<ReturnType<typeof listMyReadProgress>>['items'],
+        error: null as string | null
+    };
+    try {
+        const [bookmarks, collections, history] = await Promise.all([
+            listMyBookmarks(),
+            listMyCollections({ limit: 200 }),
+            listMyReadProgress({ limit: 100 })
+        ]);
+        return {
+            ...empty,
+            bookmarks: bookmarks.items,
+            collections: collections.items,
+            history: history.items
+        };
+    } catch (e) {
+        if (e instanceof ApiError && e.status === 401) {
+            return { ...empty, authenticated: false };
+        }
+        if (e instanceof ApiError) {
+            return { ...empty, error: e.message };
+        }
+        throw e;
+    }
+};
diff --git a/frontend/src/routes/profile/+layout.svelte b/frontend/src/routes/profile/+layout.svelte
index f6d0e8e..1d1db32 100644
--- a/frontend/src/routes/profile/+layout.svelte
+++ b/frontend/src/routes/profile/+layout.svelte
@@ -98,6 +98,20 @@
         border-bottom: 1px solid var(--border);
     }
 
+    /* Mobile uses the bottom-nav Account/Library tabs plus the account
+       hub for cross-section navigation. The horizontal tab strip would
+       compete with the bottom nav and wrap awkwardly at narrow widths,
+       so hide it below the breakpoint and let pages stand on their own. */
+    @media (max-width: 640px) {
+        .tabs {
+            display: none;
+        }
+
+        .profile-header {
+            margin-bottom: var(--space-2);
+        }
+    }
+
     .tab {
         display: inline-flex;
         align-items: center;
diff --git a/frontend/src/routes/profile/account/+page.svelte b/frontend/src/routes/profile/account/+page.svelte
index 8dfd5bb..c5513ad 100644
--- a/frontend/src/routes/profile/account/+page.svelte
+++ b/frontend/src/routes/profile/account/+page.svelte
@@ -1,8 +1,16 @@
 <script lang="ts">
+    import { browser } from '$app/environment';
     import { goto } from '$app/navigation';
-    import { changePassword } from '$lib/api/auth';
+    import { changePassword, logout } from '$lib/api/auth';
     import { ApiError } from '$lib/api/client';
+    import { preferences } from '$lib/preferences.svelte';
     import { session } from '$lib/session.svelte';
+    import Sheet from '$lib/components/Sheet.svelte';
+    import User from '@lucide/svelte/icons/user';
+    import SlidersHorizontal from '@lucide/svelte/icons/sliders-horizontal';
+    import KeyRound from '@lucide/svelte/icons/key-round';
+    import LogOut from '@lucide/svelte/icons/log-out';
+    import ChevronRight from '@lucide/svelte/icons/chevron-right';
 
     let currentPassword = $state('');
     let newPassword = $state('');
@@ -11,6 +19,10 @@
     let success = $state<string | null>(null);
     let error: string | null = $state(null);
 
+    let isMobileViewport = $state(false);
+    let passwordSheetOpen = $state(false);
+    let loggingOut = $state(false);
+
     const passwordsMatch = $derived(
         newPassword.length > 0 && newPassword === confirmPassword
     );
@@ -22,6 +34,21 @@
             !submitting
     );
 
+    const memberSince = $derived(
+        session.user ? new Date(session.user.created_at).toLocaleDateString() : null
+    );
+
+    $effect(() => {
+        if (!browser) return;
+        const mql = window.matchMedia('(max-width: 640px)');
+        isMobileViewport = mql.matches;
+        const onChange = (e: MediaQueryListEvent) => {
+            isMobileViewport = e.matches;
+        };
+        mql.addEventListener('change', onChange);
+        return () => mql.removeEventListener('change', onChange);
+    });
+
     async function submit(e: SubmitEvent) {
         e.preventDefault();
         if (!canSubmit) return;
@@ -47,20 +74,25 @@
             submitting = false;
         }
     }
+
+    // Mirror the root layout's logout flow so the user lands at /login
+    // with the same session-clearing semantics. Replicated here rather
+    // than imported because the layout's handler closes over its own
+    // local `loggingOut` state.
+    async function handleLogout() {
+        loggingOut = true;
+        try {
+            await logout();
+        } finally {
+            session.setUser(null);
+            preferences.clearForLogout();
+            loggingOut = false;
+            await goto('/login');
+        }
+    }
 </script>
 
-{#if !session.user}
-    <p class="status" data-testid="account-signin">
-        <a href="/login?next=/profile/account">Sign in</a> to change your password.
-    </p>
-{:else}
-<section class="card">
-    <h2>Change password</h2>
-    <p class="hint">
-        Changing your password signs out every other device using this account.
-        Bot API tokens keep working — revoke them individually from the bot-token
-        list if you want to invalidate them too.
-    </p>
+{#snippet passwordForm()}
     <form onsubmit={submit} action="javascript:void(0)" data-testid="password-form">
         <label class="form-field">
             <span>Current password</span>
@@ -114,9 +146,91 @@
             <p role="alert" class="form-error" data-testid="password-error">{error}</p>
         {/if}
     </form>
-</section>
+{/snippet}
+
+{#if !session.user}
+    <p class="status" data-testid="account-signin">
+        <a href="/login?next=/profile/account">Sign in</a> to manage your account.
+    </p>
+{:else if isMobileViewport}
+    <div class="mobile-hub" data-testid="account-hub">
+        <header class="hub-profile" data-testid="account-hub-profile">
+            <div class="hub-avatar" aria-hidden="true">
+                <User size={28} aria-hidden="true" />
+            </div>
+            <div class="hub-name" data-testid="account-username">
+                {session.user.username}
+            </div>
+            {#if memberSince}
+                <div class="hub-meta">Member since {memberSince}</div>
+            {/if}
+        </header>
+
+        <div class="row-group">
+            <a class="row" href="/profile" data-testid="account-row-profile">
+                <User size={18} aria-hidden="true" />
+                <span class="row-label">Profile</span>
+                <ChevronRight size={16} aria-hidden="true" class="row-chev" />
+            </a>
+            <a
+                class="row"
+                href="/profile/preferences"
+                data-testid="account-row-preferences"
+            >
+                <SlidersHorizontal size={18} aria-hidden="true" />
+                <span class="row-label">Preferences</span>
+                <ChevronRight size={16} aria-hidden="true" class="row-chev" />
+            </a>
+            <button
+                type="button"
+                class="row"
+                onclick={() => (passwordSheetOpen = true)}
+                data-testid="account-row-change-password"
+            >
+                <KeyRound size={18} aria-hidden="true" />
+                <span class="row-label">Change password</span>
+                <ChevronRight size={16} aria-hidden="true" class="row-chev" />
+            </button>
+        </div>
+
+        <div class="row-group">
+            <button
+                type="button"
+                class="row row-destructive"
+                onclick={handleLogout}
+                disabled={loggingOut}
+                data-testid="account-row-logout"
+            >
+                <LogOut size={18} aria-hidden="true" />
+                <span class="row-label">{loggingOut ? 'Logging out…' : 'Log out'}</span>
+            </button>
+        </div>
+    </div>
+{:else}
+    <section class="card" data-testid="account-desktop-card">
+        <h2>Change password</h2>
+        <p class="hint">
+            Changing your password signs out every other device using this account.
+            Bot API tokens keep working — revoke them individually from the bot-token
+            list if you want to invalidate them too.
+        </p>
+        {@render passwordForm()}
+    </section>
 {/if}
 
+<Sheet
+    open={passwordSheetOpen && isMobileViewport}
+    title="Change password"
+    onClose={() => (passwordSheetOpen = false)}
+    testid="password-sheet"
+>
+    <p class="hint sheet-hint">
+        Changing your password signs out every other device. Bot API tokens are
+        unaffected.
+    </p>
+    {@render passwordForm()}
+</Sheet>
+
 <style>
     .card {
         background: var(--surface);
@@ -131,6 +245,10 @@
         font-size: var(--font-sm);
     }
 
+    .sheet-hint {
+        margin-top: 0;
+    }
+
     form {
         display: flex;
         flex-direction: column;
@@ -166,4 +284,106 @@
     .status {
         color: var(--text-muted);
     }
+
+    /* ===== Mobile account hub (inset-grouped iOS-style list) ===== */
+
+    .mobile-hub {
+        display: flex;
+        flex-direction: column;
+        gap: var(--space-4);
+        padding: var(--space-2) 0;
+    }
+
+    .hub-profile {
+        display: flex;
+        flex-direction: column;
+        align-items: center;
+        gap: var(--space-1);
+        padding: var(--space-4) 0 var(--space-2);
+    }
+
+    .hub-avatar {
+        display: inline-flex;
+        align-items: center;
+        justify-content: center;
+        width: 64px;
+        height: 64px;
+        border-radius: 50%;
+        background: var(--surface-elevated);
+        color: var(--text-muted);
+        border: 1px solid var(--border);
+        margin-bottom: var(--space-2);
+    }
+
+    .hub-name {
+        font-size: var(--font-lg);
+        font-weight: var(--weight-semibold);
+        color: var(--text);
+    }
+
+    .hub-meta {
+        color: var(--text-muted);
+        font-size: var(--font-sm);
+    }
+
+    .row-group {
+        background: var(--surface);
+        border: 1px solid var(--border);
+        border-radius: var(--radius-lg);
+        overflow: hidden;
+    }
+
+    .row {
+        display: flex;
+        align-items: center;
+        gap: var(--space-3);
+        width: 100%;
+        padding: var(--space-3) var(--space-4);
+        background: transparent;
+        border: 0;
+        border-bottom: 1px solid var(--border);
+        color: var(--text);
+        text-decoration: none;
+        text-align: left;
+        font-size: var(--font-base);
+        min-height: 52px;
+        cursor: pointer;
+    }
+
+    .row:last-child {
+        border-bottom: 0;
+    }
+
+    .row:hover:not(:disabled) {
+        background: var(--surface-elevated);
+        text-decoration: none;
+    }
+
+    .row-label {
+        flex: 1;
+        min-width: 0;
+    }
+
+    /* Lucide icons render as <svg>; need :global to penetrate scoping
+       since we use `class={...}` on the icon, which is hashed by Svelte
+       only when the selector matches a local element. */
+    .row :global(.row-chev) {
+        color: var(--text-muted);
+        flex-shrink: 0;
+    }
+
+    .row-destructive {
+        color: var(--danger);
+        font-weight: var(--weight-medium);
+        justify-content: center;
+    }
+
+    .row-destructive:hover:not(:disabled) {
+        background: var(--danger-soft-bg);
+    }
+
+    .row:disabled {
+        opacity: 0.6;
+        cursor: not-allowed;
+    }
 </style>