diff --git a/src/components/layout/MobileNav.tsx b/src/components/layout/MobileNav.tsx
index 30cf5a5..b327a9c 100644
--- a/src/components/layout/MobileNav.tsx
+++ b/src/components/layout/MobileNav.tsx
@@ -1,12 +1,15 @@
 import { Link, useRouterState } from '@tanstack/react-router'
+import { Home, ClipboardList, Layers, Trophy, User } from 'lucide-react'
 import { cn } from '@/lib/utils'
 
-const NAV_ITEMS = [
-  { to: '/', label: 'Home', icon: 'home', matchPrefix: '/', exact: true },
-  { to: '/archivement', label: 'Thành tích', icon: 'emoji_events', matchPrefix: '/archivement', exact: false },
-  { to: '/toeic', label: 'Luyện đề', icon: 'assignment', matchPrefix: '/toeic', exact: false },
-  { to: '/writing', label: 'Writing', icon: 'edit_note', matchPrefix: '/writing', exact: false },
-  { to: '/settings', label: 'Cài đặt', icon: 'settings', matchPrefix: '/settings', exact: false },
+// Atelier Mobile tab bar — 5 tabs matching the mobile design.
+// Labels keep the mobile design's playful brevity: Hôm nay / Luyện / Thẻ / Thành tích / Tôi
+const TABS = [
+  { to: '/',            label: 'Hôm nay',    icon: Home,          matchPrefix: '/',            exact: true  },
+  { to: '/toeic',       label: 'Luyện',      icon: ClipboardList, matchPrefix: '/toeic',       exact: false },
+  { to: '/flash-card',  label: 'Thẻ',        icon: Layers,        matchPrefix: '/flash-card',  exact: false },
+  { to: '/archivement', label: 'Thành tích', icon: Trophy,        matchPrefix: '/archivement', exact: false },
+  { to: '/settings',    label: 'Tôi',        icon: User,          matchPrefix: '/settings',    exact: false },
 ]
 
 function isActive(pathname: string, prefix: string, exact: boolean) {
@@ -18,22 +21,19 @@ export function MobileNav() {
   const pathname = location.pathname
 
   return (
-    <nav className="fixed bottom-0 inset-x-0 lg:hidden bg-white border-t border-slate-200 z-50 flex safe-area-inset-bottom">
-      {NAV_ITEMS.map((item) => {
-        const active = isActive(pathname, item.matchPrefix, item.exact)
+    <nav className="m-tabbar lg:hidden" aria-label="Chuyển màn hình">
+      {TABS.map((tab) => {
+        const active = isActive(pathname, tab.matchPrefix, tab.exact)
+        const Icon = tab.icon
         return (
           <Link
-            key={item.to}
-            to={item.to}
-            className={cn(
-              'flex-1 flex flex-col items-center justify-center gap-0.5 py-2 min-h-[56px] text-[11px] font-medium transition-colors',
-              active ? 'text-blue-600' : 'text-slate-400',
-            )}
+            key={tab.to}
+            to={tab.to}
+            className={cn('m-tab', active && 'is-active')}
+            aria-current={active ? 'page' : undefined}
           >
-            <span className="material-symbols-outlined" style={{ fontSize: 22 }}>
-              {item.icon}
-            </span>
-            {item.label}
+            <Icon width={22} height={22} strokeWidth={active ? 2.25 : 1.75} />
+            <span>{tab.label}</span>
           </Link>
         )
       })}
diff --git a/src/features/dashboard/components/Dashboard.tsx b/src/features/dashboard/components/Dashboard.tsx
index 311155c..6042a5b 100644
--- a/src/features/dashboard/components/Dashboard.tsx
+++ b/src/features/dashboard/components/Dashboard.tsx
@@ -64,7 +64,7 @@ export function Dashboard() {
 
   if (!user) {
     return (
-      <div className="px-4 lg:px-6 py-20 max-w-6xl mx-auto flex flex-col items-center text-center gap-4">
+      <div className="px-4 lg:px-6 py-20 flex flex-col items-center text-center gap-4">
         <div className="at-serif italic text-5xl" style={{ color: 'var(--at-mute-2)' }}>Thành tích</div>
         <p className="max-w-sm" style={{ color: 'var(--at-mute)' }}>
           Đăng nhập để xem streak, XP, Xu và bảng xếp hạng của bạn.
@@ -114,7 +114,7 @@ export function Dashboard() {
   }))
 
   return (
-    <div className="px-6 lg:px-10 py-10 max-w-6xl mx-auto page-enter">
+    <div className="px-6 lg:px-10 py-10 page-enter">
       {/* Editorial head */}
       <div className="flex flex-col lg:flex-row lg:items-end lg:justify-between gap-6 mb-10">
         <div>
diff --git a/src/features/flash-card/components/FlashCardLearnPage.tsx b/src/features/flash-card/components/FlashCardLearnPage.tsx
index e627a74..25d3c37 100644
--- a/src/features/flash-card/components/FlashCardLearnPage.tsx
+++ b/src/features/flash-card/components/FlashCardLearnPage.tsx
@@ -3,6 +3,7 @@ import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
 import { useNavigate } from '@tanstack/react-router'
 import { cn } from '@/lib/utils'
 import { useAuthStore } from '@/store/auth-store'
+import { useAuthModalStore } from '@/store/auth-modal-store'
 import {
   fetchFlashcardTerms,
   fetchUserProgress,
@@ -34,7 +35,9 @@ function speak(word: string) {
 export function FlashCardLearnPage({ listId }: Props) {
   const navigate = useNavigate()
   const user = useAuthStore(s => s.user)
+  const openAuthModal = useAuthModalStore(s => s.open)
   const queryClient = useQueryClient()
+  const isGuest = !user
 
   const [isFlipped, setIsFlipped] = useState(false)
   const [currentIdx, setCurrentIdx] = useState(0)
@@ -213,6 +216,12 @@ export function FlashCardLearnPage({ listId }: Props) {
     setTimeout(advance, 450)
   }, [currentIdx, sessionTerms, user, saveAnswer, progressMap, advance])
 
+  // Jump to a specific card in the deck (no progress write — just navigate)
+  const jumpTo = useCallback((idx: number) => {
+    setCurrentIdx(idx)
+    setIsFlipped(false)
+  }, [])
+
   // Keyboard shortcuts
   useEffect(() => {
     function onKey(e: KeyboardEvent) {
@@ -222,14 +231,26 @@ export function FlashCardLearnPage({ listId }: Props) {
         setIsFlipped(v => !v)
         return
       }
-      if (!isFlipped) return
+      // Arrow nav — works for everyone, no progress write
+      if (e.key === 'ArrowLeft') {
+        e.preventDefault()
+        if (currentIdx > 0) jumpTo(currentIdx - 1)
+        return
+      }
+      if (e.key === 'ArrowRight') {
+        e.preventDefault()
+        if (currentIdx < sessionTerms.length - 1) jumpTo(currentIdx + 1)
+        return
+      }
+      // SRS keys — auth users only
+      if (isGuest || !isFlipped) return
       if (e.key.toLowerCase() === 'j') handleAnswer('known')
       else if (e.key.toLowerCase() === 'k') handleAnswer('hard')
       else if (e.key.toLowerCase() === 'i') handleAnswer('ignored')
     }
     window.addEventListener('keydown', onKey)
     return () => window.removeEventListener('keydown', onKey)
-  }, [isDone, isFlipped, currentIdx, sessionTerms, handleAnswer])
+  }, [isDone, isFlipped, currentIdx, sessionTerms, handleAnswer, isGuest, jumpTo])
 
   const total = sessionTerms.length
   const progressPct = total > 0 ? Math.round((currentIdx / total) * 100) : 0
@@ -309,12 +330,6 @@ export function FlashCardLearnPage({ listId }: Props) {
     )
   }
 
-  // Jump to a specific card in the deck (no progress write — just navigate)
-  const jumpTo = (idx: number) => {
-    setCurrentIdx(idx)
-    setIsFlipped(false)
-  }
-
   return (
     <div
       className="atelier fixed top-16 right-0 left-0 lg:left-60 bottom-20 lg:bottom-0 flex flex-col px-4 lg:px-6 py-3 overflow-hidden"
@@ -468,28 +483,60 @@ export function FlashCardLearnPage({ listId }: Props) {
         </div>
       )}
 
-      {/* Actions */}
+      {/* Actions — auth users get SRS buttons, guests get prev/next + login CTA */}
       <div className="mt-4 w-full" style={{ maxWidth: 420 }}>
-        <div className={cn('flex items-stretch gap-2.5 w-full transition-opacity duration-300', !isFlipped && 'opacity-40 pointer-events-none')}>
-          <button onClick={() => handleAnswer('ignored')} disabled={!isFlipped} className="at-action" style={{ padding: '11px 14px', fontSize: 13 }}>
-            Bỏ qua <span className="at-kbd">I</span>
-          </button>
-          <button onClick={() => handleAnswer('hard')} disabled={!isFlipped} className="at-action at-action-review" style={{ padding: '11px 14px', fontSize: 13 }}>
-            Cần ôn <span className="at-kbd">K</span>
-          </button>
-          <button onClick={() => handleAnswer('known')} disabled={!isFlipped} className="at-action at-action-known" style={{ padding: '11px 14px', fontSize: 13 }}>
-            Đã thuộc
-            <span className="at-kbd" style={{ background: 'rgba(255,255,255,0.16)', color: 'rgba(255,255,255,0.9)', border: 'none' }}>J</span>
-          </button>
-        </div>
+        {isGuest ? (
+          <div className="flex flex-col gap-2.5">
+            <div className="flex items-stretch gap-2.5 w-full">
+              <button
+                onClick={() => currentIdx > 0 && jumpTo(currentIdx - 1)}
+                disabled={currentIdx === 0}
+                className="at-action"
+                style={{ padding: '11px 14px', fontSize: 13 }}
+              >
+                <span className="at-kbd">←</span> Trước
+              </button>
+              <button
+                onClick={() => currentIdx < sessionTerms.length - 1 && jumpTo(currentIdx + 1)}
+                disabled={currentIdx >= sessionTerms.length - 1}
+                className="at-action"
+                style={{ padding: '11px 14px', fontSize: 13 }}
+              >
+                Sau <span className="at-kbd">→</span>
+              </button>
+            </div>
+            <button
+              onClick={() => openAuthModal('register')}
+              className="at-action at-action-known"
+              style={{ padding: '11px 14px', fontSize: 13 }}
+            >
+              Đăng nhập để theo dõi tiến độ
+            </button>
+          </div>
+        ) : (
+          <div className={cn('flex items-stretch gap-2.5 w-full transition-opacity duration-300', !isFlipped && 'opacity-40 pointer-events-none')}>
+            <button onClick={() => handleAnswer('ignored')} disabled={!isFlipped} className="at-action" style={{ padding: '11px 14px', fontSize: 13 }}>
+              Bỏ qua <span className="at-kbd">I</span>
+            </button>
+            <button onClick={() => handleAnswer('hard')} disabled={!isFlipped} className="at-action at-action-review" style={{ padding: '11px 14px', fontSize: 13 }}>
+              Cần ôn <span className="at-kbd">K</span>
+            </button>
+            <button onClick={() => handleAnswer('known')} disabled={!isFlipped} className="at-action at-action-known" style={{ padding: '11px 14px', fontSize: 13 }}>
+              Đã thuộc
+              <span className="at-kbd" style={{ background: 'rgba(255,255,255,0.16)', color: 'rgba(255,255,255,0.9)', border: 'none' }}>J</span>
+            </button>
+          </div>
+        )}
       </div>
 
       {/* Progress */}
       <div className="mt-3 w-full" style={{ maxWidth: 420 }}>
         <div className="flex items-baseline justify-between mb-1.5 text-[12px] text-[var(--at-mute)]">
           <span>
-            <b className="text-[var(--at-ink)] tabular-nums">{currentIdx + 1}</b> / {total} ·{' '}
-            {sessionStats.known} biết · {sessionStats.learning} học · {sessionStats.ignored} bỏ
+            <b className="text-[var(--at-ink)] tabular-nums">{currentIdx + 1}</b> / {total}
+            {!isGuest && (
+              <> · {sessionStats.known} biết · {sessionStats.learning} học · {sessionStats.ignored} bỏ</>
+            )}
           </span>
           <span className="at-pct" style={{ fontSize: 18 }}>{progressPct}%</span>
         </div>
@@ -501,37 +548,59 @@ export function FlashCardLearnPage({ listId }: Props) {
 
       {/* Right sidebar */}
       <aside className="hidden lg:flex flex-col gap-3 min-h-0">
-        {/* Today stats */}
-        <div
-          className="rounded-2xl p-4 flex-shrink-0"
-          style={{ background: 'var(--at-surface)', border: '1px solid var(--at-line)' }}
-        >
-          <div className="at-eyebrow mb-2" style={{ fontSize: 11 }}>Hôm nay</div>
-          <div className="grid grid-cols-2 gap-3 mt-1">
-            <div>
-              <div style={{ fontSize: 10, color: 'var(--at-mute)', textTransform: 'uppercase', fontWeight: 600, letterSpacing: '0.12em' }}>
-                Đã học
-              </div>
-              <div
-                className="at-serif"
-                style={{ fontSize: 26, fontWeight: 400, letterSpacing: '-0.02em', lineHeight: 1.1, color: 'var(--at-ink)' }}
-              >
-                {sessionStats.known + sessionStats.learning + sessionStats.ignored}
-              </div>
+        {/* Today stats — auth users; guests see a login nudge */}
+        {isGuest ? (
+          <div
+            className="rounded-2xl p-4 flex-shrink-0"
+            style={{ background: 'var(--at-brand-soft)', border: '1px solid var(--at-line)' }}
+          >
+            <div className="at-eyebrow mb-1" style={{ fontSize: 11, color: 'var(--at-brand-ink)' }}>Chế độ khách</div>
+            <div
+              className="at-serif"
+              style={{ fontSize: 18, fontWeight: 400, letterSpacing: '-0.02em', lineHeight: 1.2, color: 'var(--at-brand-ink)' }}
+            >
+              Đăng nhập để <i>ghi nhớ</i> tiến độ
             </div>
-            <div>
-              <div style={{ fontSize: 10, color: 'var(--at-mute)', textTransform: 'uppercase', fontWeight: 600, letterSpacing: '0.12em' }}>
-                Đúng
+            <button
+              onClick={() => openAuthModal('register')}
+              className="mt-3 w-full text-[12px] font-semibold py-2 rounded-lg transition-opacity hover:opacity-90"
+              style={{ background: 'var(--at-brand)', color: '#fff' }}
+            >
+              Đăng nhập / Đăng ký
+            </button>
+          </div>
+        ) : (
+          <div
+            className="rounded-2xl p-4 flex-shrink-0"
+            style={{ background: 'var(--at-surface)', border: '1px solid var(--at-line)' }}
+          >
+            <div className="at-eyebrow mb-2" style={{ fontSize: 11 }}>Hôm nay</div>
+            <div className="grid grid-cols-2 gap-3 mt-1">
+              <div>
+                <div style={{ fontSize: 10, color: 'var(--at-mute)', textTransform: 'uppercase', fontWeight: 600, letterSpacing: '0.12em' }}>
+                  Đã học
+                </div>
+                <div
+                  className="at-serif"
+                  style={{ fontSize: 26, fontWeight: 400, letterSpacing: '-0.02em', lineHeight: 1.1, color: 'var(--at-ink)' }}
+                >
+                  {sessionStats.known + sessionStats.learning + sessionStats.ignored}
+                </div>
               </div>
-              <div
-                className="at-serif"
-                style={{ fontSize: 26, fontWeight: 400, letterSpacing: '-0.02em', lineHeight: 1.1, color: 'var(--at-good)' }}
-              >
-                {sessionStats.known}
+              <div>
+                <div style={{ fontSize: 10, color: 'var(--at-mute)', textTransform: 'uppercase', fontWeight: 600, letterSpacing: '0.12em' }}>
+                  Đúng
+                </div>
+                <div
+                  className="at-serif"
+                  style={{ fontSize: 26, fontWeight: 400, letterSpacing: '-0.02em', lineHeight: 1.1, color: 'var(--at-good)' }}
+                >
+                  {sessionStats.known}
+                </div>
               </div>
             </div>
           </div>
-        </div>
+        )}
 
         {/* Cards in deck — compact rows (word only) */}
         <div
diff --git a/src/features/flash-card/components/FlashCardListPage.tsx b/src/features/flash-card/components/FlashCardListPage.tsx
index d67c285..a5ecdc5 100644
--- a/src/features/flash-card/components/FlashCardListPage.tsx
+++ b/src/features/flash-card/components/FlashCardListPage.tsx
@@ -125,7 +125,7 @@ export function FlashCardListPage() {
   })
 
   return (
-    <div className="px-6 lg:px-10 py-10 max-w-6xl mx-auto page-enter">
+    <div className="px-6 lg:px-10 py-10 page-enter">
       <div className="flex flex-col lg:flex-row lg:items-end lg:justify-between gap-6 mb-10">
         <div>
           <div className="at-eyebrow mb-3">Từ vựng TOEIC</div>
diff --git a/src/features/flash-card/components/FlashCardTermsPage.tsx b/src/features/flash-card/components/FlashCardTermsPage.tsx
index c56daeb..86b9640 100644
--- a/src/features/flash-card/components/FlashCardTermsPage.tsx
+++ b/src/features/flash-card/components/FlashCardTermsPage.tsx
@@ -68,7 +68,7 @@ export function FlashCardTermsPage({ listId }: Props) {
   })
 
   return (
-    <div className="px-6 lg:px-10 py-10 max-w-6xl mx-auto page-enter">
+    <div className="px-6 lg:px-10 py-10 page-enter">
       {/* Editorial head */}
       <div className="flex flex-col lg:flex-row lg:items-end lg:justify-between gap-6 mb-10">
         <div className="flex items-start gap-4 min-w-0">
diff --git a/src/features/flash-card/components/Vocabulary.tsx b/src/features/flash-card/components/Vocabulary.tsx
index 257351b..870d99f 100644
--- a/src/features/flash-card/components/Vocabulary.tsx
+++ b/src/features/flash-card/components/Vocabulary.tsx
@@ -71,7 +71,7 @@ export function Vocabulary() {
     .reverse()
 
   return (
-    <div className="px-4 lg:px-6 py-6 max-w-6xl mx-auto page-enter">
+    <div className="px-4 lg:px-6 py-6 page-enter">
       {/* Mobile topic chips */}
       <div className="lg:hidden mb-4 overflow-x-auto pb-1">
         <div className="flex gap-2 w-max">
diff --git a/src/features/home/components/Home.tsx b/src/features/home/components/Home.tsx
index 856e18a..1eda978 100644
--- a/src/features/home/components/Home.tsx
+++ b/src/features/home/components/Home.tsx
@@ -35,7 +35,7 @@ export function Home() {
   const firstName = user?.name ?? 'bạn'
 
   return (
-    <div className="px-6 lg:px-10 py-10 max-w-6xl mx-auto page-enter">
+    <div className="px-6 lg:px-10 py-10 page-enter">
       {/* Page head — editorial */}
       <div className="flex flex-col lg:flex-row lg:items-end lg:justify-between gap-6 mb-10">
         <div>
diff --git a/src/features/settings/components/Settings.tsx b/src/features/settings/components/Settings.tsx
index e813d5a..1082c98 100644
--- a/src/features/settings/components/Settings.tsx
+++ b/src/features/settings/components/Settings.tsx
@@ -13,7 +13,7 @@ export function Settings() {
 
   if (!user) {
     return (
-      <div className="px-4 lg:px-6 py-12 max-w-6xl mx-auto flex flex-col items-center justify-center gap-4 text-center">
+      <div className="px-4 lg:px-6 py-12 flex flex-col items-center justify-center gap-4 text-center">
         <span className="material-symbols-outlined text-slate-300" style={{ fontSize: 64 }}>settings</span>
         <h1 className="text-xl font-bold text-slate-700">Cài đặt</h1>
         <p className="text-slate-400 text-sm max-w-xs">
@@ -30,7 +30,7 @@ export function Settings() {
   }
 
   return (
-    <div className="px-4 lg:px-6 py-6 max-w-5xl mx-auto">
+    <div className="px-4 lg:px-6 py-6">
       <div className="mb-6">
         <h1 className="text-2xl font-extrabold text-slate-800 mb-1">Cài đặt</h1>
         <p className="text-slate-400 text-sm">Quản lý hồ sơ, mục tiêu học tập và thông báo.</p>
diff --git a/src/features/toeic/components/ToeicPractice.tsx b/src/features/toeic/components/ToeicPractice.tsx
index 2a80dcf..30e428f 100644
--- a/src/features/toeic/components/ToeicPractice.tsx
+++ b/src/features/toeic/components/ToeicPractice.tsx
@@ -28,7 +28,7 @@ export function ToeicPractice() {
   }
 
   return (
-    <div className="px-6 py-8 max-w-6xl mx-auto page-enter">
+    <div className="px-6 py-8 page-enter">
       <div className="mb-8">
         <h1 className="text-3xl font-extrabold text-slate-800 mb-2">Chọn Part TOEIC</h1>
         <p className="text-slate-500">
diff --git a/src/features/writing/components/WritingChecker.tsx b/src/features/writing/components/WritingChecker.tsx
index ee4e02e..314f480 100644
--- a/src/features/writing/components/WritingChecker.tsx
+++ b/src/features/writing/components/WritingChecker.tsx
@@ -99,7 +99,7 @@ export function WritingChecker() {
   const wordCount = text.split(/\s+/).filter(Boolean).length
 
   return (
-    <div className="px-6 lg:px-10 py-10 max-w-6xl mx-auto page-enter">
+    <div className="px-6 lg:px-10 py-10 page-enter">
       {/* Editorial page head */}
       <div className="flex flex-col lg:flex-row lg:items-end lg:justify-between gap-6 mb-10">
         <div className="min-w-0">
diff --git a/src/features/writing/components/WritingHistory.tsx b/src/features/writing/components/WritingHistory.tsx
index f917e76..eddb646 100644
--- a/src/features/writing/components/WritingHistory.tsx
+++ b/src/features/writing/components/WritingHistory.tsx
@@ -107,7 +107,7 @@ export function WritingHistory() {
   if (!user) return null
 
   return (
-    <section className="px-4 lg:px-6 pb-10 max-w-6xl mx-auto">
+    <section className="px-4 lg:px-6 pb-10">
       <h2 className="text-lg font-bold text-slate-800 mb-4">Lịch sử chấm bài</h2>
 
       {isLoading && (
diff --git a/src/index.css b/src/index.css
index b9a96f5..58911ef 100644
--- a/src/index.css
+++ b/src/index.css
@@ -1,6 +1,7 @@
 @import "tailwindcss";
 @import "tw-animate-css";
 @import "shadcn/tailwind.css";
+@import "./styles/mobile.css";
 
 @custom-variant dark (&:is(.dark *));
 
diff --git a/src/routes/__root.tsx b/src/routes/__root.tsx
index b06efe0..52d2b9f 100644
--- a/src/routes/__root.tsx
+++ b/src/routes/__root.tsx
@@ -32,10 +32,12 @@ function RootLayout() {
   }
 
   return (
-    <div className="min-h-screen bg-slate-50">
+    <div className="min-h-screen" style={{ background: 'var(--at-paper)' }}>
       <Sidebar />
       <AppHeader />
-      <main className="lg:ml-60 pt-16 pb-20 lg:pb-0 min-h-screen">
+      {/* Extra bottom padding on mobile to clear the floating tab bar
+          (68px pill + 10px margin + safe-area). */}
+      <main className="lg:ml-60 pt-16 pb-28 lg:pb-0 min-h-screen">
         <Outlet />
       </main>
       <MobileNav />
diff --git a/src/styles/mobile.css b/src/styles/mobile.css
new file mode 100644
index 0000000..5c84cdc
--- /dev/null
+++ b/src/styles/mobile.css
@@ -0,0 +1,295 @@
+/* Mobile UI primitives — Atelier Mobile design.
+   Only kicks in on narrow viewports via `@media (max-width: 880px)`.
+   Uses the existing `--at-*` design tokens; does NOT touch desktop layouts. */
+
+@media (max-width: 880px) {
+  /* Mobile page background gradient */
+  body {
+    background:
+      radial-gradient(60% 60% at 50% 0%, color-mix(in oklab, var(--at-brand) 6%, transparent) 0%, transparent 70%),
+      var(--at-paper);
+  }
+}
+
+/* -------- Mobile primitives (usable on any viewport) -------- */
+
+/* Card — soft surface with hairline border and small shadow */
+.m-card {
+  background: var(--at-surface);
+  border: 1px solid var(--at-line);
+  border-radius: 20px;
+  padding: 18px;
+  box-shadow: 0 1px 2px rgba(15, 17, 20, 0.04);
+}
+.m-card + .m-card {
+  margin-top: 12px;
+}
+.m-row {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+}
+
+/* Big serif display numbers */
+.m-num {
+  font-family: var(--at-serif);
+  font-weight: 400;
+  letter-spacing: -0.03em;
+  line-height: 0.95;
+}
+.m-num.xl {
+  font-size: 72px;
+}
+.m-num.lg {
+  font-size: 48px;
+}
+.m-num.md {
+  font-size: 32px;
+}
+
+/* Eyebrow */
+.m-eyebrow {
+  font-size: 10.5px;
+  font-weight: 700;
+  letter-spacing: 0.14em;
+  text-transform: uppercase;
+  color: var(--at-mute);
+}
+
+/* Chips */
+.m-chip {
+  display: inline-flex;
+  align-items: center;
+  gap: 5px;
+  padding: 4px 9px;
+  border-radius: 999px;
+  font-size: 11px;
+  font-weight: 600;
+  background: var(--at-paper-2);
+  color: var(--at-ink-2);
+  border: 1px solid var(--at-line);
+}
+.m-chip.brand {
+  background: var(--at-brand-soft);
+  color: var(--at-brand);
+  border-color: color-mix(in oklab, var(--at-brand) 18%, transparent);
+}
+.m-chip.good {
+  background: var(--at-good-soft);
+  color: var(--at-good);
+  border-color: color-mix(in oklab, var(--at-good) 20%, transparent);
+}
+.m-chip.streak {
+  background: var(--at-streak-soft);
+  color: var(--at-streak);
+  border-color: color-mix(in oklab, var(--at-streak) 22%, transparent);
+}
+
+/* Progress bar */
+.m-bar {
+  width: 100%;
+  height: 8px;
+  border-radius: 99px;
+  background: var(--at-line-2);
+  overflow: hidden;
+}
+.m-bar > span {
+  display: block;
+  height: 100%;
+  background: var(--at-brand);
+  border-radius: 99px;
+  transition: width 0.6s cubic-bezier(0.2, 0.7, 0.2, 1);
+}
+
+/* Buttons */
+.m-btn {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  gap: 6px;
+  height: 44px;
+  padding: 0 18px;
+  border-radius: 14px;
+  font-size: 14px;
+  font-weight: 600;
+  background: var(--at-surface);
+  color: var(--at-ink);
+  border: 1px solid var(--at-line);
+  transition: transform 0.08s ease;
+}
+.m-btn:active {
+  transform: scale(0.97);
+}
+.m-btn.primary {
+  background: var(--at-ink);
+  color: var(--at-paper);
+  border-color: var(--at-ink);
+}
+.m-btn.brand {
+  background: var(--at-brand);
+  color: white;
+  border-color: var(--at-brand);
+  box-shadow: 0 4px 14px -4px color-mix(in oklab, var(--at-brand) 60%, transparent);
+}
+.m-btn.block {
+  width: 100%;
+}
+.m-btn.sm {
+  height: 34px;
+  padding: 0 12px;
+  font-size: 12.5px;
+}
+
+/* Section header */
+.m-section-head {
+  display: flex;
+  align-items: baseline;
+  justify-content: space-between;
+  padding: 20px 4px 12px;
+}
+.m-section-title {
+  font-family: var(--at-serif);
+  font-weight: 400;
+  font-size: 22px;
+  letter-spacing: -0.02em;
+  line-height: 1.1;
+}
+.m-section-title i {
+  font-style: italic;
+  color: var(--at-brand);
+}
+.m-section-link {
+  font-size: 12.5px;
+  color: var(--at-brand);
+  font-weight: 600;
+}
+
+/* Topic tile */
+.m-topic-tile {
+  border-radius: 18px;
+  padding: 14px;
+  background: var(--at-surface);
+  border: 1px solid var(--at-line);
+  text-align: left;
+  position: relative;
+  overflow: hidden;
+  min-height: 100px;
+  display: flex;
+  flex-direction: column;
+  justify-content: space-between;
+  gap: 8px;
+  transition: transform 0.1s;
+}
+.m-topic-tile:active {
+  transform: scale(0.98);
+}
+
+/* Grids */
+.m-grid-2 {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: 10px;
+}
+.m-grid-3 {
+  display: grid;
+  grid-template-columns: 1fr 1fr 1fr;
+  gap: 10px;
+}
+
+/* Screen transition */
+.m-fade {
+  animation: mFade 0.35s cubic-bezier(0.2, 0.7, 0.2, 1);
+}
+@keyframes mFade {
+  from {
+    opacity: 0;
+    transform: translateY(6px);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0);
+  }
+}
+
+/* -------- Mobile-only responsive tweaks (only < 880px) -------- */
+@media (max-width: 880px) {
+  /* Tab bar — floating glass pill */
+  .m-tabbar {
+    position: fixed;
+    left: 10px;
+    right: 10px;
+    bottom: calc(10px + env(safe-area-inset-bottom));
+    height: 68px;
+    border-radius: 28px;
+    background: color-mix(in oklab, var(--at-surface) 88%, transparent);
+    backdrop-filter: blur(16px);
+    -webkit-backdrop-filter: blur(16px);
+    border: 1px solid var(--at-line);
+    box-shadow:
+      0 -2px 14px rgba(15, 17, 20, 0.04),
+      0 14px 32px -12px rgba(15, 17, 20, 0.16);
+    display: grid;
+    grid-template-columns: repeat(5, 1fr);
+    align-items: stretch;
+    z-index: 30;
+    padding: 6px;
+    gap: 2px;
+  }
+  .m-tab {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    gap: 3px;
+    border-radius: 20px;
+    color: var(--at-mute);
+    font-size: 10px;
+    font-weight: 600;
+    letter-spacing: 0.02em;
+    padding: 6px 4px;
+    transition: color 0.15s, background 0.15s;
+  }
+  .m-tab.is-active {
+    color: var(--at-brand);
+    background: var(--at-brand-softer);
+  }
+  .m-tab > svg {
+    transition: transform 0.15s;
+  }
+  .m-tab.is-active > svg {
+    transform: translateY(-1px) scale(1.08);
+  }
+}
+
+/* -------- Mobile top bar (floating title) -------- */
+@media (max-width: 880px) {
+  .m-topbar {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 10px;
+    padding: 16px 16px 12px;
+    background: color-mix(in oklab, var(--at-paper) 92%, transparent);
+    backdrop-filter: blur(8px);
+    -webkit-backdrop-filter: blur(8px);
+    border-bottom: 1px solid var(--at-line);
+    position: sticky;
+    top: 0;
+    z-index: 20;
+  }
+  .m-topbar-title {
+    font-family: var(--at-serif);
+    font-weight: 400;
+    font-size: 26px;
+    letter-spacing: -0.02em;
+    line-height: 1;
+    min-width: 0;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+  }
+  .m-topbar-title i {
+    font-style: italic;
+    color: var(--at-brand);
+  }
+}