diff --git a/web/src/plan/PlanPage.module.css b/web/src/plan/PlanPage.module.css
index 03fcf98..74ea096 100644
--- a/web/src/plan/PlanPage.module.css
+++ b/web/src/plan/PlanPage.module.css
@@ -410,6 +410,12 @@
   list-style: none;
 }
 
+/* An upright tablet's week: four days over three, every column wide enough
+   that nothing scrolls sideways. */
+.portraitPage .week {
+  grid-template-columns: repeat(4, minmax(0, 1fr));
+}
+
 .column {
   min-width: 0;
   display: flex;
diff --git a/web/src/plan/PlanPage.tsx b/web/src/plan/PlanPage.tsx
index d15f80f..471268e 100644
--- a/web/src/plan/PlanPage.tsx
+++ b/web/src/plan/PlanPage.tsx
@@ -8,7 +8,7 @@ import { Confirm } from '../settings/LeaveGuard.tsx'
 import { methodLabels } from '../settings/RegularsSettingsPage.tsx'
 import { formatClockTime, useHouseholdSettings } from '../settings/api.ts'
 import { supplyRunScreen, useGenerateSupplyRun, useSupplyRun, WEEK_PARAM } from '../shopping/api.ts'
-import { useBreakpoint, type Breakpoint } from '../shell/useBreakpoint.ts'
+import { useBreakpoint, useOrientation, type Breakpoint } from '../shell/useBreakpoint.ts'
 import { Button } from '../ui/Button.tsx'
 import buttonStyles from '../ui/Button.module.css'
 import { EmptyState } from '../ui/EmptyState.tsx'
@@ -673,8 +673,10 @@ function PushFailure({ error, cached, onRetry }: { error: Error; cached: boolean
 // week; the week buttons keep ?week= on the week shown. The board keeps its place in the tree across layouts, so crossing a
 // breakpoint keeps a draft being followed. From tablet up a dinner is
 // dragged from the strip or the panel onto a day of the grid to swap it in.
+// An upright tablet lays the week out four days over three.
 export function PlanPage() {
   const layout = useBreakpoint()
+  const orientation = useOrientation()
   const settings = useHouseholdSettings()
   const [params, setParams] = useSearchParams()
   const chosen = params.get(WEEK_PARAM)
@@ -699,7 +701,11 @@ export function PlanPage() {
   }
   return (
     <PlanDragProvider>
-      <div className={`${styles.page} ${styles[`${layout}Page`]}`}>
+      <div
+        className={[styles.page, styles[`${layout}Page`], layout === 'tablet' && orientation === 'portrait' && styles.portraitPage]
+          .filter(Boolean)
+          .join(' ')}
+      >
         <div className={styles.board}>
           {content}
           {layout === 'tablet' && <QuestLogStrip />}
diff --git a/web/src/settings/SettingsTabs.module.css b/web/src/settings/SettingsTabs.module.css
index 180b236..16d6567 100644
--- a/web/src/settings/SettingsTabs.module.css
+++ b/web/src/settings/SettingsTabs.module.css
@@ -83,6 +83,12 @@
   gap: 20px;
 }
 
+/* An upright tablet stacks the columns: Notifications above the AI
+   assistant and Recipe search. */
+.portrait .columns {
+  grid-template-columns: minmax(0, 1fr);
+}
+
 .column {
   min-width: 0;
   display: flex;
diff --git a/web/src/settings/SettingsTabs.tsx b/web/src/settings/SettingsTabs.tsx
index 2aaf975..ab706be 100644
--- a/web/src/settings/SettingsTabs.tsx
+++ b/web/src/settings/SettingsTabs.tsx
@@ -1,4 +1,5 @@
 import { useId, useRef, useState, type KeyboardEvent, type ReactNode } from 'react'
+import { useBreakpoint, useOrientation } from '../shell/useBreakpoint.ts'
 import { Card } from '../ui/Card.tsx'
 import { AIAssistantCard } from './AISettingsPage.tsx'
 import { HouseholdSettingsSections } from './HouseholdSettingsPage.tsx'
@@ -21,7 +22,10 @@ const step: Record<string, number> = { ArrowRight: 1, ArrowLeft: -1 }
 // sub-tabs instead of the mobile list. Every tab stays mounted while hidden,
 // so a draft survives switching tabs, and one leave guard covers them all.
 // hidden hides the page but keeps it mounted, drafts and leave guard included.
+// On an upright tablet the two columns stack into one.
 export function SettingsTabs({ hidden = false }: { hidden?: boolean }) {
+  const layout = useBreakpoint()
+  const orientation = useOrientation()
   const [tab, setTab] = useState<Tab>('notifications-ai')
   const [householdDirty, setHouseholdDirty] = useState(false)
   const [aiDirty, setAIDirty] = useState(false)
@@ -64,7 +68,10 @@ export function SettingsTabs({ hidden = false }: { hidden?: boolean }) {
   }
 
   return (
-    <div className={styles.page} hidden={hidden}>
+    <div
+      className={[styles.page, layout === 'tablet' && orientation === 'portrait' && styles.portrait].filter(Boolean).join(' ')}
+      hidden={hidden}
+    >
       <header className={styles.header}>
         <div className={styles.heading}>
           <h1 className={styles.title}>Settings</h1>
diff --git a/web/src/shell/AppShell.module.css b/web/src/shell/AppShell.module.css
index e1eff44..ee4c987 100644
--- a/web/src/shell/AppShell.module.css
+++ b/web/src/shell/AppShell.module.css
@@ -22,3 +22,9 @@
 .desktop .main {
   padding: 32px 36px;
 }
+
+/* An upright tablet (820 px wide) leaves 724 px beside the rail; slimmer side
+   padding gives the page a little more of it. */
+.tablet.portrait .main {
+  padding: 32px 28px;
+}
diff --git a/web/src/shell/AppShell.tsx b/web/src/shell/AppShell.tsx
index 7baf72b..9e79a28 100644
--- a/web/src/shell/AppShell.tsx
+++ b/web/src/shell/AppShell.tsx
@@ -2,15 +2,17 @@ import { Outlet } from 'react-router'
 import { BottomBar } from './BottomBar.tsx'
 import { Rail } from './Rail.tsx'
 import { Sidebar } from './Sidebar.tsx'
-import { useBreakpoint } from './useBreakpoint.ts'
+import { useBreakpoint, useOrientation } from './useBreakpoint.ts'
 import styles from './AppShell.module.css'
 
 // The responsive frame around every page: one nav layout per breakpoint and a
-// scrolling main area for the routed page.
+// scrolling main area for the routed page. A portrait viewport is marked so
+// the narrower upright tablet keeps its content clear of the rail.
 export function AppShell() {
   const breakpoint = useBreakpoint()
+  const orientation = useOrientation()
   return (
-    <div className={`${styles.shell} ${styles[breakpoint]}`}>
+    <div className={[styles.shell, styles[breakpoint], orientation === 'portrait' && styles.portrait].filter(Boolean).join(' ')}>
       {breakpoint === 'mobile' && <BottomBar />}
       {breakpoint === 'tablet' && <Rail />}
       {breakpoint === 'desktop' && <Sidebar />}
diff --git a/web/src/shell/tabletPortrait.test.tsx b/web/src/shell/tabletPortrait.test.tsx
new file mode 100644
index 0000000..83c50e3
--- /dev/null
+++ b/web/src/shell/tabletPortrait.test.tsx
@@ -0,0 +1,225 @@
+import { render, screen } from '@testing-library/react'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { AppRoutes } from '../App.tsx'
+import planStyles from '../plan/PlanPage.module.css'
+import settingsTabsStyles from '../settings/SettingsTabs.module.css'
+import {
+  AI_MODELS,
+  AI_SETTINGS,
+  CHAT_WEBHOOK_NONE,
+  GOOGLE_NOT_CONNECTED,
+  HOME,
+  HOUSEHOLD_SETTINGS,
+  NOTIFICATION_SETTINGS,
+  RECIPE_SEARCH_SETTINGS,
+  ApiProviders,
+} from '../test/ApiProviders.tsx'
+import { declaredStyle } from '../test/cssRules.ts'
+import { InDataRouter } from '../test/dataRouter.tsx'
+import { dinnerBody } from '../test/dinners.ts'
+import { jsonResponse, ME } from '../test/fetchStub.ts'
+import { mockViewport } from '../test/matchMedia.ts'
+import shellStyles from './AppShell.module.css'
+import railStyles from './Rail.module.css'
+
+// Every primary route on a tablet held upright (820 × 1180) and on its side
+// (1180 × 820): both have the 96 px rail and the tablet layout; upright, the
+// shell is marked portrait, the Plan week reflows four days over three, and
+// Settings' two columns stack into one.
+
+const PORTRAIT = { width: 820, height: 1180 }
+const LANDSCAPE = { width: 1180, height: 820 }
+
+const DAYS = ['2026-10-05', '2026-10-06', '2026-10-07', '2026-10-08', '2026-10-09', '2026-10-10', '2026-10-11']
+
+const PLAN = {
+  id: 'plan-1',
+  week_start: '2026-10-05',
+  week_label: 'Week 41 · Oct 5 – 11',
+  status: 'draft',
+  ai_note: null,
+  calendar_synced_at: null,
+  days: DAYS.map((date, i) => ({
+    date,
+    dinner: { id: `d${i}`, name: `Dinner ${i}`, photo: null, minutes: 30, method: 'stovetop', origin: 'regular' },
+    is_new: false,
+    start_by: null,
+  })),
+  updated_at: '2026-10-04T15:00:00Z',
+}
+
+const SUPPLY_RUN = {
+  weekStart: '2026-10-05',
+  label: 'Week 41 · Oct 5 – 11',
+  title: null,
+  status: 'current',
+  sent_to_chat_at: null,
+  chat_send_unconfirmed_at: null,
+  needed_count: 1,
+  total_count: 1,
+  groups: [
+    {
+      dinner: { id: 'd0', name: 'Dinner 0' },
+      date: '2026-10-05',
+      day: 'Monday',
+      items: [{ id: 'i1', name: 'Ground beef', qty: '1 lb', needed: true }],
+    },
+  ],
+}
+
+const DETAIL = {
+  id: 'd1',
+  name: 'Korean beef bowls',
+  status: 'regular',
+  origin: 'regular',
+  method: 'stovetop',
+  minutes_total: 30,
+  difficulty: 'easy',
+  cuisine: 'korean',
+  is_favorite: false,
+  photo_urls: null,
+  ingredients: [{ name: 'Ground beef', qty: '1', unit: 'lb', note: null, raw_text: '1 lb ground beef' }],
+  steps: ['Brown the beef.'],
+  source: null,
+  grounding_status: 'manual',
+  grounding_error: null,
+  why_picked: null,
+}
+
+// The API every route reads, answered as a settled household's server would.
+// Any other request stays pending, so a route that reads more just shows its
+// loading state.
+const API: Record<string, unknown> = {
+  '/api/v1/me': ME,
+  '/api/v1/home': HOME,
+  '/api/v1/rotation-reviews': { reviews: [] },
+  '/api/v1/settings/household': HOUSEHOLD_SETTINGS,
+  '/api/v1/settings/ai': AI_SETTINGS,
+  '/api/v1/settings/ai/models': AI_MODELS,
+  '/api/v1/settings/recipe-search': RECIPE_SEARCH_SETTINGS,
+  '/api/v1/settings/notifications': NOTIFICATION_SETTINGS,
+  '/api/v1/settings/chat-webhook': CHAT_WEBHOOK_NONE,
+  '/api/v1/integrations/google': GOOGLE_NOT_CONNECTED,
+  '/api/v1/plans/2026-10-05': PLAN,
+  '/api/v1/shopping/2026-10-05': SUPPLY_RUN,
+  '/api/v1/shopping/archive?by=week': { by: 'week', periods: [] },
+  '/api/v1/suggestions/deck': { suggestions: [], active_batch: null, failed_batch: null },
+  '/api/v1/dinners?status=regular': { dinners: [dinnerBody('r1', 'Beef tacos')] },
+  '/api/v1/dinners?status=quest_log': { dinners: [] },
+  '/api/v1/dinners/d1': DETAIL,
+}
+
+beforeEach(() => {
+  vi.useFakeTimers({ toFake: ['Date'] })
+  vi.setSystemTime(new Date('2026-10-07T16:00:00Z'))
+  const path = (input: Parameters<typeof fetch>[0]) => new URL(String(input), 'https://mealquest.test')
+  vi.stubGlobal(
+    'fetch',
+    vi.fn<typeof fetch>((input) => {
+      const url = path(input)
+      const key = `${url.pathname}${url.search}`
+      if (!Object.hasOwn(API, key)) return new Promise<Response>(() => {})
+      return Promise.resolve(jsonResponse(200, API[key]))
+    }),
+  )
+})
+
+afterEach(() => {
+  Reflect.deleteProperty(window, 'matchMedia')
+  vi.useRealTimers()
+  vi.unstubAllGlobals()
+})
+
+async function renderAt(path: string, { width, height }: { width: number; height: number }) {
+  mockViewport(width, { height })
+  render(
+    <InDataRouter path={path}>
+      <ApiProviders>
+        <AppRoutes />
+      </ApiProviders>
+    </InDataRouter>,
+  )
+  // The routes wait for the household settings (OnboardingGate).
+  await screen.findByRole('navigation', { name: 'Primary' })
+}
+
+function shell() {
+  return screen.getByRole('main').parentElement!
+}
+
+const ROUTES: [string, string][] = [
+  ['Home', '/'],
+  ['Plan', '/plan?week=2026-10-05'],
+  ['Supply run', '/plan/shopping'],
+  ['Supply archive', '/plan/shopping/archive'],
+  ['Discover', '/discover'],
+  ['Quick dinners', '/quick'],
+  ['Cook from what I have', '/cook-from-pantry'],
+  ['Dinner detail (Kitchen reading mode)', '/dinner/d1'],
+  ['Settings', '/settings'],
+  ['Notifications', '/settings/notifications'],
+  ['AI assistant', '/settings/ai'],
+  ['Household', '/settings/household'],
+  ['Regulars', '/settings/regulars'],
+  ['Calendar', '/settings/calendar'],
+]
+
+describe.each([
+  ['portrait', PORTRAIT],
+  ['landscape', LANDSCAPE],
+])('tablet %s', (orientation, viewport) => {
+  const portrait = orientation === 'portrait'
+
+  it.each(ROUTES)(`renders %s with the 96 px rail in the tablet ${orientation} layout`, async (_name, path) => {
+    await renderAt(path, viewport)
+    expect(screen.getAllByRole('navigation')).toHaveLength(1)
+    expect(screen.getByRole('navigation', { name: 'Primary' })).toHaveClass(railStyles.rail!)
+    expect(declaredStyle(screen.getByRole('navigation', { name: 'Primary' })).width).toBe('96px')
+    expect(shell()).toHaveClass(shellStyles.tablet!)
+    if (portrait) expect(shell()).toHaveClass(shellStyles.portrait!)
+    else expect(shell()).not.toHaveClass(shellStyles.portrait!)
+    expect(await screen.findByRole('heading', { level: 1 })).toBeInTheDocument()
+  })
+
+  it(`lays the Plan week out ${portrait ? 'four days over three' : 'in seven columns'}`, async () => {
+    await renderAt('/plan?week=2026-10-05', viewport)
+    const week = await screen.findByRole('list', { name: 'Dinners this week' })
+    const page = week.closest(`.${planStyles.tabletPage}`)
+    expect(page).not.toBeNull()
+    if (portrait) expect(page).toHaveClass(planStyles.portraitPage!)
+    else expect(page).not.toHaveClass(planStyles.portraitPage!)
+    expect(declaredStyle(week).gridTemplateColumns).toBe(
+      portrait ? 'repeat(4, minmax(0, 1fr))' : 'repeat(7, minmax(112px, 1fr))',
+    )
+    expect(declaredStyle(week).overflowX).toBe('auto')
+  })
+
+  it(`shows Settings (mock 2e) in ${portrait ? 'one column' : 'two columns'}`, async () => {
+    await renderAt('/settings', viewport)
+    const panel = screen.getByRole('tabpanel', { name: 'Notifications & AI' })
+    const page = panel.closest(`.${settingsTabsStyles.page}`)
+    if (portrait) expect(page).toHaveClass(settingsTabsStyles.portrait!)
+    else expect(page).not.toHaveClass(settingsTabsStyles.portrait!)
+    expect(declaredStyle(panel).gridTemplateColumns).toBe(
+      portrait ? 'minmax(0, 1fr)' : 'minmax(0, 1fr) minmax(0, 1.15fr)',
+    )
+  })
+})
+
+it('reflows when the tablet turns', async () => {
+  const resize = mockViewport(PORTRAIT.width, { height: PORTRAIT.height })
+  render(
+    <InDataRouter path="/plan?week=2026-10-05">
+      <ApiProviders>
+        <AppRoutes />
+      </ApiProviders>
+    </InDataRouter>,
+  )
+  const week = await screen.findByRole('list', { name: 'Dinners this week' })
+  expect(shell()).toHaveClass(shellStyles.portrait!)
+  expect(week.closest(`.${planStyles.tabletPage}`)).toHaveClass(planStyles.portraitPage!)
+  resize(LANDSCAPE.width, LANDSCAPE.height)
+  expect(shell()).toHaveClass(shellStyles.tablet!)
+  expect(shell()).not.toHaveClass(shellStyles.portrait!)
+  expect(week.closest(`.${planStyles.tabletPage}`)).not.toHaveClass(planStyles.portraitPage!)
+})
diff --git a/web/src/shell/useBreakpoint.ts b/web/src/shell/useBreakpoint.ts
index 28b9f48..d28e7cb 100644
--- a/web/src/shell/useBreakpoint.ts
+++ b/web/src/shell/useBreakpoint.ts
@@ -7,6 +7,12 @@ export type Breakpoint = 'mobile' | 'tablet' | 'desktop'
 export const TABLET_QUERY = '(min-width: 768px)'
 export const DESKTOP_QUERY = '(min-width: 1200px)'
 
+export type Orientation = 'portrait' | 'landscape'
+
+// A tablet held upright (820 × 1180) has the rail and the tablet layout but
+// far less width than one on its side, so pages reflow for it.
+export const PORTRAIT_QUERY = '(orientation: portrait)'
+
 // The layout the current viewport calls for, updated as the viewport crosses
 // a breakpoint.
 export function useBreakpoint(): Breakpoint {
@@ -29,3 +35,16 @@ export function useBreakpoint(): Breakpoint {
     lists.desktop.matches ? 'desktop' : lists.tablet.matches ? 'tablet' : 'mobile',
   )
 }
+
+// The viewport's orientation, updated as the device turns.
+export function useOrientation(): Orientation {
+  const [list] = useState(() => window.matchMedia(PORTRAIT_QUERY))
+  const subscribe = useCallback(
+    (onChange: () => void) => {
+      list.addEventListener('change', onChange)
+      return () => list.removeEventListener('change', onChange)
+    },
+    [list],
+  )
+  return useSyncExternalStore(subscribe, () => (list.matches ? 'portrait' : 'landscape'))
+}
diff --git a/web/src/test/matchMedia.ts b/web/src/test/matchMedia.ts
index a4312c3..5467d2a 100644
--- a/web/src/test/matchMedia.ts
+++ b/web/src/test/matchMedia.ts
@@ -3,16 +3,22 @@ import { act } from '@testing-library/react'
 type Listener = (event: MediaQueryListEvent) => void
 
 // Replaces window.matchMedia with one that answers min-width / max-width
-// queries for a pretend viewport width, and prefers-reduced-motion: reduce
-// with reducedMotion (jsdom has no matchMedia and no layout). Returns a
-// function that resizes the pretend viewport and notifies every query whose
-// answer changed.
-export function mockViewport(initialWidth: number, { reducedMotion = false } = {}): (width: number) => void {
+// queries for a pretend viewport width, orientation: portrait for its height
+// (a viewport given no height is landscape), and prefers-reduced-motion:
+// reduce with reducedMotion (jsdom has no matchMedia and no layout). Returns
+// a function that resizes the pretend viewport and notifies every query
+// whose answer changed.
+export function mockViewport(
+  initialWidth: number,
+  { reducedMotion = false, height: initialHeight = 0 } = {},
+): (width: number, height?: number) => void {
   let width = initialWidth
+  let height = initialHeight
   const lists: { list: MediaQueryList; listeners: Set<Listener> }[] = []
 
   function evaluate(query: string): boolean {
     if (query === '(prefers-reduced-motion: reduce)') return reducedMotion
+    if (query === '(orientation: portrait)') return height >= width
     const min = /\(min-width:\s*(\d+)px\)/.exec(query)
     const max = /\(max-width:\s*(\d+)px\)/.exec(query)
     if (!min && !max) throw new Error(`mockViewport cannot evaluate ${JSON.stringify(query)}`)
@@ -37,9 +43,10 @@ export function mockViewport(initialWidth: number, { reducedMotion = false } = {
     return list
   }
 
-  return (next: number) => {
+  return (nextWidth: number, nextHeight = 0) => {
     const before = lists.map(({ list }) => list.matches)
-    width = next
+    width = nextWidth
+    height = nextHeight
     act(() => {
       lists.forEach(({ list, listeners }, i) => {
         if (list.matches === before[i]) return