diff --git a/apps/frontend/src/components/LanguageSwitcher.tsx b/apps/frontend/src/components/LanguageSwitcher.tsx
index 534e669..4c5e5f0 100644
--- a/apps/frontend/src/components/LanguageSwitcher.tsx
+++ b/apps/frontend/src/components/LanguageSwitcher.tsx
@@ -13,22 +13,20 @@ export function LanguageSwitcher({ className }: { className?: string }) {
   return (
     <div
       className={cn(
-        'inline-flex items-center gap-1 rounded-md border border-border bg-surface/90 p-1 text-xs shadow-card',
+        'language-switcher',
         className,
       )}
       aria-label={t('language.switch')}
     >
-      <Languages className="ml-1 h-3.5 w-3.5 text-muted" aria-hidden />
+      <Languages className="language-switcher__icon" aria-hidden />
       {languages.map((item) => (
         <button
           key={item.value}
           type="button"
           onClick={() => setLanguage(item.value)}
           className={cn(
-            'rounded px-2 py-1 font-semibold transition-colors',
-            language === item.value
-              ? 'bg-primary text-primary-foreground'
-              : 'text-muted hover:bg-surface-muted hover:text-ink',
+            'language-switcher__button',
+            language === item.value && 'language-switcher__button--active',
           )}
           aria-pressed={language === item.value}
           title={item.value === 'ru' ? t('language.ru') : t('language.en')}
diff --git a/apps/frontend/src/components/Layout/AppShell.tsx b/apps/frontend/src/components/Layout/AppShell.tsx
index d29eab1..6fa46c4 100644
--- a/apps/frontend/src/components/Layout/AppShell.tsx
+++ b/apps/frontend/src/components/Layout/AppShell.tsx
@@ -4,9 +4,9 @@ import { Footer } from './Footer';
 
 export function AppShell() {
   return (
-    <div className="flex min-h-screen flex-col">
+    <div className="app-shell">
       <Header />
-      <main className="container-page flex-1 py-6 sm:py-10">
+      <main className="app-shell__main">
         <Outlet />
       </main>
       <Footer />
diff --git a/apps/frontend/src/components/Layout/Footer.tsx b/apps/frontend/src/components/Layout/Footer.tsx
index b5d933d..a478d01 100644
--- a/apps/frontend/src/components/Layout/Footer.tsx
+++ b/apps/frontend/src/components/Layout/Footer.tsx
@@ -17,15 +17,15 @@ export function Footer() {
   });
 
   return (
-    <footer className="container-page mt-10 py-6 text-xs text-muted">
-      <div className="flex flex-col items-center justify-between gap-2 sm:flex-row">
-        <div className="flex items-center gap-2">
+    <footer className="app-footer">
+      <div className="app-footer__inner">
+        <div className="app-footer__brand">
           <Gift className="h-4 w-4" aria-hidden />
-          <span className="font-display text-sm">{t('app.name')}</span>
+          <span className="app-footer__brand-name">{t('app.name')}</span>
         </div>
-        <div className="flex items-center gap-3">
+        <div className="app-footer__meta">
           <span>{t('footer.frontend', { version: FRONTEND_VERSION })}</span>
-          <span className="opacity-50">·</span>
+          <span className="app-footer__separator">·</span>
           <span>{t('footer.backend', { version: data?.backend ?? '...' })}</span>
         </div>
       </div>
diff --git a/apps/frontend/src/components/Layout/Header.tsx b/apps/frontend/src/components/Layout/Header.tsx
index 83b101d..4bac00c 100644
--- a/apps/frontend/src/components/Layout/Header.tsx
+++ b/apps/frontend/src/components/Layout/Header.tsx
@@ -44,21 +44,21 @@ export function Header() {
   if (!user) return null;
 
   return (
-    <header className="container-page pt-6">
-      <div className="grid grid-cols-1 items-center gap-3 rounded-lg border border-border bg-surface/80 px-4 py-3 backdrop-blur lg:grid-cols-[auto_minmax(0,1fr)_auto]">
-        <Link to="/" className="flex min-w-0 items-center gap-2">
-          <span className="inline-flex h-9 w-9 items-center justify-center rounded-md bg-primary text-primary-foreground shadow-card">
+    <header className="app-header">
+      <div className="app-header__inner">
+        <Link to="/" className="app-header__brand">
+          <span className="app-header__brand-mark">
             <Gift className="h-4 w-4" />
           </span>
           <div className="min-w-0">
-            <div className="font-display text-lg leading-tight">{t('app.name')}</div>
-            <div className="truncate text-xs text-muted">
+            <div className="app-header__brand-title">{t('app.name')}</div>
+            <div className="app-header__brand-subtitle">
               {t('header.signedInAs', { name: user.displayName })}
             </div>
           </div>
         </Link>
 
-        <nav className="flex min-w-0 items-center gap-1 overflow-x-auto whitespace-nowrap lg:justify-center">
+        <nav className="app-header__nav">
           {links.map((l) => (
             <NavLink
               key={l.to}
@@ -66,8 +66,8 @@ export function Header() {
               end={l.end}
               className={({ isActive }) =>
                 cn(
-                  'inline-flex items-center gap-1.5 rounded-md px-3 py-1.5 text-sm font-medium transition-colors',
-                  isActive ? 'bg-primary text-primary-foreground shadow-card' : 'text-ink hover:bg-ink/5',
+                  'app-header__nav-link',
+                  isActive && 'app-header__nav-link--active',
                 )
               }
             >
@@ -80,8 +80,8 @@ export function Header() {
               to={`/u/${friend.data.slug}`}
               className={({ isActive }) =>
                 cn(
-                  'inline-flex items-center gap-1.5 rounded-md px-3 py-1.5 text-sm font-medium transition-colors',
-                  isActive ? 'bg-primary text-primary-foreground shadow-card' : 'text-ink hover:bg-ink/5',
+                  'app-header__nav-link',
+                  isActive && 'app-header__nav-link--active',
                 )
               }
             >
@@ -91,7 +91,7 @@ export function Header() {
           )}
         </nav>
 
-        <div className="flex shrink-0 items-center gap-1 justify-self-start lg:justify-self-end">
+        <div className="app-header__actions">
           <LanguageSwitcher />
           <Button
             variant="ghost"
diff --git a/apps/frontend/src/components/ui/Modal.tsx b/apps/frontend/src/components/ui/Modal.tsx
index f1a73c7..4cd1430 100644
--- a/apps/frontend/src/components/ui/Modal.tsx
+++ b/apps/frontend/src/components/ui/Modal.tsx
@@ -40,9 +40,9 @@ export function Modal({
   if (!open) return null;
 
   return createPortal(
-    <div className="fixed inset-0 z-50 flex items-end justify-center p-0 sm:items-center sm:p-6">
+    <div className="modal">
       <div
-        className="absolute inset-0 bg-ink/40 backdrop-blur-sm animate-fade-in-up"
+        className="modal__backdrop"
         onClick={onClose}
         aria-hidden
       />
@@ -50,27 +50,21 @@ export function Modal({
         role="dialog"
         aria-modal="true"
         className={cn(
-          'relative w-full bg-surface shadow-pop animate-fade-in-up',
-          'rounded-t-xl sm:rounded-xl',
-          size === 'md' ? 'sm:max-w-lg' : 'sm:max-w-2xl',
-          'max-h-[90vh] overflow-hidden flex flex-col',
+          'modal__panel',
+          size === 'md' ? 'modal__panel--md' : 'modal__panel--lg',
         )}
       >
-        <header className="flex items-start justify-between gap-4 border-b border-border px-5 py-4">
-          <div className="min-w-0">
-            <h2 className="text-lg font-semibold text-ink">{title}</h2>
-            {description && <p className="mt-1 text-sm text-muted">{description}</p>}
+        <header className="modal__header">
+          <div className="modal__title-wrap">
+            <h2 className="modal__title">{title}</h2>
+            {description && <p className="modal__description">{description}</p>}
           </div>
           <Button variant="ghost" size="icon" onClick={onClose} aria-label="Close">
             <X className="h-5 w-5" />
           </Button>
         </header>
-        <div className="overflow-y-auto px-5 py-5">{children}</div>
-        {footer && (
-          <footer className="flex items-center justify-end gap-2 border-t border-border px-5 py-4">
-            {footer}
-          </footer>
-        )}
+        <div className="modal__body">{children}</div>
+        {footer && <footer className="modal__footer">{footer}</footer>}
       </div>
     </div>,
     document.body,
diff --git a/apps/frontend/src/pages/ArchivePage.tsx b/apps/frontend/src/pages/ArchivePage.tsx
index 87e7ca3..f006377 100644
--- a/apps/frontend/src/pages/ArchivePage.tsx
+++ b/apps/frontend/src/pages/ArchivePage.tsx
@@ -15,9 +15,9 @@ export function ArchivePage() {
 
   return (
     <div className="grid gap-6">
-      <section>
-        <h1 className="font-display text-3xl">{t('archive.title')}</h1>
-        <p className="text-sm text-muted">
+      <section className="page-section">
+        <h1 className="page-section__title">{t('archive.title')}</h1>
+        <p className="page-section__text">
           {t('archive.description')}
         </p>
       </section>
@@ -25,10 +25,10 @@ export function ArchivePage() {
       {isLoading && <div className="text-muted">{t('common.loading')}</div>}
 
       {!isLoading && data && data.length === 0 && (
-        <div className="flex flex-col items-center gap-2 rounded-xl border border-border bg-surface/80 p-10 text-center shadow-card">
-          <Archive className="h-10 w-10 text-muted" />
-          <h2 className="text-xl font-semibold">{t('archive.emptyTitle')}</h2>
-          <p className="text-sm text-muted">{t('archive.emptyText')}</p>
+        <div className="empty-state">
+          <Archive className="empty-state__icon" />
+          <h2 className="empty-state__title">{t('archive.emptyTitle')}</h2>
+          <p className="empty-state__text">{t('archive.emptyText')}</p>
         </div>
       )}
 
diff --git a/apps/frontend/src/pages/CompletedPage.tsx b/apps/frontend/src/pages/CompletedPage.tsx
index 3b517b1..34c45f7 100644
--- a/apps/frontend/src/pages/CompletedPage.tsx
+++ b/apps/frontend/src/pages/CompletedPage.tsx
@@ -15,9 +15,9 @@ export function CompletedPage() {
 
   return (
     <div className="grid gap-6">
-      <section>
-        <h1 className="font-display text-3xl">{t('completed.title')}</h1>
-        <p className="text-sm text-muted">
+      <section className="page-section">
+        <h1 className="page-section__title">{t('completed.title')}</h1>
+        <p className="page-section__text">
           {t('completed.description')}
         </p>
       </section>
@@ -25,10 +25,10 @@ export function CompletedPage() {
       {isLoading && <div className="text-muted">{t('common.loading')}</div>}
 
       {!isLoading && data && data.length === 0 && (
-        <div className="flex flex-col items-center gap-2 rounded-xl border border-border bg-surface/80 p-10 text-center shadow-card">
-          <CheckCircle2 className="h-10 w-10 text-muted" />
-          <h2 className="text-xl font-semibold">{t('completed.emptyTitle')}</h2>
-          <p className="text-sm text-muted">
+        <div className="empty-state">
+          <CheckCircle2 className="empty-state__icon" />
+          <h2 className="empty-state__title">{t('completed.emptyTitle')}</h2>
+          <p className="empty-state__text">
             {t('completed.emptyText')}
           </p>
         </div>
diff --git a/apps/frontend/src/pages/DashboardPage.tsx b/apps/frontend/src/pages/DashboardPage.tsx
index 97f73c7..5597838 100644
--- a/apps/frontend/src/pages/DashboardPage.tsx
+++ b/apps/frontend/src/pages/DashboardPage.tsx
@@ -26,10 +26,10 @@ export function DashboardPage() {
 
   return (
     <div className="grid gap-6">
-      <section className="flex flex-wrap items-end justify-between gap-4">
+      <section className="page-section flex flex-wrap items-end justify-between gap-4">
         <div>
-          <h1 className="font-display text-3xl">{t('dashboard.title')}</h1>
-          <p className="text-sm text-muted">
+          <h1 className="page-section__title">{t('dashboard.title')}</h1>
+          <p className="page-section__text">
             {t('dashboard.description')}
             {user && (
               <Link
@@ -61,11 +61,11 @@ export function DashboardPage() {
       )}
 
       {!isLoading && data && data.length === 0 && (
-        <div className="flex flex-col items-center gap-4 rounded-xl border border-border bg-surface/80 p-10 text-center shadow-card">
-          <img src="/empty-state.svg" alt="" className="h-40 w-40 opacity-90" />
+        <div className="empty-state gap-4">
+          <img src="/empty-state.svg" alt="" className="empty-state__icon--image" />
           <div>
-            <h2 className="text-xl font-semibold">{t('dashboard.emptyTitle')}</h2>
-            <p className="mt-1 text-sm text-muted">
+            <h2 className="empty-state__title">{t('dashboard.emptyTitle')}</h2>
+            <p className="empty-state__text mt-1">
               {t('dashboard.emptyText')}
             </p>
           </div>
diff --git a/apps/frontend/src/pages/LoginPage.tsx b/apps/frontend/src/pages/LoginPage.tsx
index 904e5dc..f2cd062 100644
--- a/apps/frontend/src/pages/LoginPage.tsx
+++ b/apps/frontend/src/pages/LoginPage.tsx
@@ -47,11 +47,11 @@ export function LoginPage() {
   });
 
   return (
-    <div className="flex min-h-screen flex-col">
-      <div className="container-page flex justify-end pt-6">
+    <div className="app-shell">
+      <div className="public-profile__toolbar">
         <LanguageSwitcher />
       </div>
-      <div className="container-page flex flex-1 items-center justify-center py-12">
+      <div className="app-shell__main flex items-center justify-center py-12">
         <div className="w-full max-w-md animate-fade-in-up">
           <div className="mb-6 flex items-center justify-center gap-2">
             <span className="inline-flex h-11 w-11 items-center justify-center rounded-md bg-primary text-primary-foreground shadow-card">
@@ -60,7 +60,7 @@ export function LoginPage() {
             <h1 className="font-display text-3xl">{t('app.name')}</h1>
           </div>
 
-          <div className="rounded-xl border border-border bg-surface p-6 shadow-card sm:p-8">
+          <div className="profile-form p-6 sm:p-8">
             <h2 className="mb-1 text-xl font-semibold">{t('login.title')}</h2>
             <p className="mb-6 text-sm text-muted">
               {t('login.description')}
diff --git a/apps/frontend/src/pages/NotFoundPage.tsx b/apps/frontend/src/pages/NotFoundPage.tsx
index 7b15e12..ddcba09 100644
--- a/apps/frontend/src/pages/NotFoundPage.tsx
+++ b/apps/frontend/src/pages/NotFoundPage.tsx
@@ -5,8 +5,8 @@ import { useI18n } from '@/i18n/i18n';
 export function NotFoundPage() {
   const { t } = useI18n();
   return (
-    <div className="flex min-h-screen items-center justify-center p-6">
-      <div className="max-w-md rounded-xl border border-border bg-surface p-8 text-center shadow-card">
+    <div className="app-shell items-center justify-center p-6">
+      <div className="empty-state max-w-md bg-surface p-8">
         <h1 className="font-display text-4xl">404</h1>
         <p className="mt-2 text-muted">{t('notFound.text')}</p>
         <Link to="/" className="mt-4 inline-block">
diff --git a/apps/frontend/src/pages/ProfileSettingsPage.tsx b/apps/frontend/src/pages/ProfileSettingsPage.tsx
index b206940..9b51f78 100644
--- a/apps/frontend/src/pages/ProfileSettingsPage.tsx
+++ b/apps/frontend/src/pages/ProfileSettingsPage.tsx
@@ -122,9 +122,9 @@ export function ProfileSettingsPage() {
 
   return (
     <div className="grid max-w-2xl gap-6">
-      <section>
-        <h1 className="font-display text-3xl">{t('profile.title')}</h1>
-        <p className="text-sm text-muted">
+      <section className="page-section">
+        <h1 className="page-section__title">{t('profile.title')}</h1>
+        <p className="page-section__text">
           {t('profile.publicPage')}
           <code className="rounded bg-ink/5 px-1.5 py-0.5">/u/{data?.slug ?? '...'}</code>.
         </p>
@@ -133,18 +133,18 @@ export function ProfileSettingsPage() {
       {isLoading ? (
         <div className="text-muted">{t('common.loading')}</div>
       ) : (
-        <form className="grid gap-4 rounded-xl border border-border bg-surface p-6 shadow-card" onSubmit={submit}>
-          <section className="flex flex-wrap items-center gap-4 rounded-md border border-border bg-surface-muted p-4">
-            <span className="inline-flex h-16 w-16 items-center justify-center overflow-hidden rounded-full bg-primary text-primary-foreground">
+        <form className="profile-form" onSubmit={submit}>
+          <section className="profile-form__avatar-panel">
+            <span className="profile-form__avatar-preview">
               {avatarPreview ? (
-                <img src={avatarPreview} alt="" className="h-16 w-16 object-cover" />
+                <img src={avatarPreview} alt="" className="profile-form__avatar-image" />
               ) : (
                 <Gift className="h-6 w-6" />
               )}
             </span>
-            <div className="min-w-0 flex-1">
-              <h2 className="text-sm font-semibold">{t('profile.avatar')}</h2>
-              <p className="text-xs text-muted">{t('profile.avatarHint')}</p>
+            <div className="profile-form__avatar-copy">
+              <h2 className="profile-form__avatar-title">{t('profile.avatar')}</h2>
+              <p className="profile-form__avatar-hint">{t('profile.avatarHint')}</p>
             </div>
             <input
               ref={fileInputRef}
@@ -199,7 +199,7 @@ export function ProfileSettingsPage() {
               </span>
             )}
           </div>
-          <div className="flex items-center justify-end gap-2">
+          <div className="profile-form__actions">
             <Button type="submit" disabled={!isDirty || isSubmitting}>
               {isSubmitting && <Loader2 className="h-4 w-4 animate-spin" />}
               {t('common.saveChanges')}
diff --git a/apps/frontend/src/pages/PublicProfilePage.tsx b/apps/frontend/src/pages/PublicProfilePage.tsx
index 752eb32..25d4d1a 100644
--- a/apps/frontend/src/pages/PublicProfilePage.tsx
+++ b/apps/frontend/src/pages/PublicProfilePage.tsx
@@ -58,8 +58,8 @@ export function PublicProfilePage() {
   }, [wishes.data, markSeen, queryClient, slug]);
 
   return (
-    <div className="flex min-h-screen flex-col">
-      <div className="container-page flex items-center justify-between gap-3 pt-6">
+    <div className="public-profile">
+      <div className="public-profile__toolbar">
         {user ? (
           <Link to="/">
             <Button variant="secondary" size="sm">
@@ -71,13 +71,13 @@ export function PublicProfilePage() {
         )}
         <LanguageSwitcher />
       </div>
-      <main className="container-page flex-1 py-10">
+      <main className="public-profile__main">
         {profile.isLoading && <div className="text-muted">{t('common.loading')}</div>}
 
         {profile.isError && (
-          <div className="mx-auto max-w-lg rounded-xl border border-border bg-surface p-8 text-center shadow-card">
-            <h1 className="font-display text-2xl">{t('public.notFoundTitle')}</h1>
-            <p className="mt-2 text-sm text-muted">
+          <div className="empty-state mx-auto max-w-lg bg-surface p-8">
+            <h1 className="empty-state__title">{t('public.notFoundTitle')}</h1>
+            <p className="empty-state__text mt-2">
               {t('public.notFoundText')}
             </p>
           </div>
@@ -85,32 +85,32 @@ export function PublicProfilePage() {
 
         {profile.data && (
           <>
-            <section className="mb-10 flex flex-col items-center gap-3 text-center">
-              <span className="inline-flex h-14 w-14 items-center justify-center rounded-full bg-primary text-primary-foreground shadow-card">
+            <section className="public-profile__hero">
+              <span className="public-profile__avatar">
                 {profile.data.avatarUrl ? (
                   <img
                     src={profile.data.avatarUrl}
                     alt=""
-                    className="h-14 w-14 rounded-full object-cover"
+                    className="public-profile__avatar-image"
                   />
                 ) : (
                   <Gift className="h-6 w-6" />
                 )}
               </span>
-              <h1 className="font-display text-4xl">
+              <h1 className="public-profile__title">
                 {t('public.wishlistTitle', { name: profile.data.displayName })}
               </h1>
               {profile.data.bio && (
-                <p className="max-w-xl text-muted">{profile.data.bio}</p>
+                <p className="public-profile__bio">{profile.data.bio}</p>
               )}
             </section>
 
             {wishes.isLoading && <div className="text-muted">{t('public.loadingWishes')}</div>}
 
             {wishes.data && wishes.data.length === 0 && (
-              <div className="mx-auto max-w-lg rounded-xl border border-border bg-surface/80 p-10 text-center shadow-card">
-                <h2 className="text-xl font-semibold">{t('public.emptyTitle')}</h2>
-                <p className="mt-1 text-sm text-muted">{t('public.emptyText')}</p>
+              <div className="empty-state mx-auto max-w-lg">
+                <h2 className="empty-state__title">{t('public.emptyTitle')}</h2>
+                <p className="empty-state__text mt-1">{t('public.emptyText')}</p>
               </div>
             )}
 
diff --git a/apps/frontend/src/pages/TrashPage.tsx b/apps/frontend/src/pages/TrashPage.tsx
index 5c22522..c96f7d4 100644
--- a/apps/frontend/src/pages/TrashPage.tsx
+++ b/apps/frontend/src/pages/TrashPage.tsx
@@ -12,9 +12,9 @@ export function TrashPage() {
 
   return (
     <div className="grid gap-6">
-      <section>
-        <h1 className="font-display text-3xl">{t('trash.title')}</h1>
-        <p className="text-sm text-muted">
+      <section className="page-section">
+        <h1 className="page-section__title">{t('trash.title')}</h1>
+        <p className="page-section__text">
           {t('trash.description', { days: dayCount(TRASH_RETENTION_DAYS) })}
         </p>
       </section>
@@ -22,10 +22,10 @@ export function TrashPage() {
       {isLoading && <div className="text-muted">{t('common.loading')}</div>}
 
       {!isLoading && data && data.length === 0 && (
-        <div className="flex flex-col items-center gap-2 rounded-xl border border-border bg-surface/80 p-10 text-center shadow-card">
-          <Trash2 className="h-10 w-10 text-muted" />
-          <h2 className="text-xl font-semibold">{t('trash.emptyTitle')}</h2>
-          <p className="text-sm text-muted">
+        <div className="empty-state">
+          <Trash2 className="empty-state__icon" />
+          <h2 className="empty-state__title">{t('trash.emptyTitle')}</h2>
+          <p className="empty-state__text">
             {t('trash.emptyText', { days: dayCount(TRASH_RETENTION_DAYS) })}
           </p>
         </div>
diff --git a/apps/frontend/src/styles/global.css b/apps/frontend/src/styles/global.css
index 3d8b699..387c403 100644
--- a/apps/frontend/src/styles/global.css
+++ b/apps/frontend/src/styles/global.css
@@ -29,6 +29,186 @@
 
 @layer components {
   /* BEM-friendly classes: kept parallel to Tailwind utilities where possible. */
+  .app-shell {
+    @apply flex min-h-screen flex-col;
+  }
+  .app-shell__main {
+    @apply mx-auto w-full max-w-6xl flex-1 px-4 py-6 sm:px-6 sm:py-10 lg:px-8;
+  }
+
+  .app-header {
+    @apply mx-auto w-full max-w-6xl px-4 pt-6 sm:px-6 lg:px-8;
+  }
+  .app-header__inner {
+    @apply grid grid-cols-1 items-center gap-3 rounded-lg border border-border bg-surface/80 px-4 py-3 backdrop-blur lg:grid-cols-[auto_minmax(0,1fr)_auto];
+  }
+  .app-header__brand {
+    @apply flex min-w-0 items-center gap-2;
+  }
+  .app-header__brand-mark {
+    @apply inline-flex h-9 w-9 items-center justify-center rounded-md bg-primary text-primary-foreground shadow-card;
+  }
+  .app-header__brand-title {
+    @apply font-display text-lg leading-tight;
+  }
+  .app-header__brand-subtitle {
+    @apply truncate text-xs text-muted;
+  }
+  .app-header__nav {
+    @apply flex min-w-0 items-center gap-1 overflow-x-auto whitespace-nowrap lg:justify-center;
+  }
+  .app-header__nav-link {
+    @apply inline-flex items-center gap-1.5 rounded-md px-3 py-1.5 text-sm font-medium text-ink transition-colors hover:bg-ink/5;
+  }
+  .app-header__nav-link--active {
+    @apply bg-primary text-primary-foreground shadow-card hover:bg-primary;
+  }
+  .app-header__actions {
+    @apply flex shrink-0 items-center gap-1 justify-self-start lg:justify-self-end;
+  }
+
+  .app-footer {
+    @apply mx-auto mt-10 w-full max-w-6xl px-4 py-6 text-xs text-muted sm:px-6 lg:px-8;
+  }
+  .app-footer__inner {
+    @apply flex flex-col items-center justify-between gap-2 sm:flex-row;
+  }
+  .app-footer__brand {
+    @apply flex items-center gap-2;
+  }
+  .app-footer__brand-name {
+    @apply font-display text-sm;
+  }
+  .app-footer__meta {
+    @apply flex items-center gap-3;
+  }
+  .app-footer__separator {
+    @apply opacity-50;
+  }
+
+  .language-switcher {
+    @apply inline-flex items-center gap-1 rounded-md border border-border bg-surface/90 p-1 text-xs shadow-card;
+  }
+  .language-switcher__icon {
+    @apply ml-1 h-3.5 w-3.5 text-muted;
+  }
+  .language-switcher__button {
+    @apply rounded px-2 py-1 font-semibold text-muted transition-colors hover:bg-surface-muted hover:text-ink;
+  }
+  .language-switcher__button--active {
+    @apply bg-primary text-primary-foreground hover:bg-primary hover:text-primary-foreground;
+  }
+
+  .empty-state {
+    @apply flex flex-col items-center gap-2 rounded-xl border border-border bg-surface/80 p-10 text-center shadow-card;
+  }
+  .empty-state__icon {
+    @apply h-10 w-10 text-muted;
+  }
+  .empty-state__icon--image {
+    @apply h-40 w-40 opacity-90;
+  }
+  .empty-state__title {
+    @apply text-xl font-semibold;
+  }
+  .empty-state__text {
+    @apply text-sm text-muted;
+  }
+
+  .page-section {
+    @apply grid gap-1;
+  }
+  .page-section__title {
+    @apply font-display text-3xl;
+  }
+  .page-section__text {
+    @apply text-sm text-muted;
+  }
+
+  .public-profile {
+    @apply flex min-h-screen flex-col;
+  }
+  .public-profile__toolbar {
+    @apply mx-auto flex w-full max-w-6xl items-center justify-between gap-3 px-4 pt-6 sm:px-6 lg:px-8;
+  }
+  .public-profile__main {
+    @apply mx-auto w-full max-w-6xl flex-1 px-4 py-10 sm:px-6 lg:px-8;
+  }
+  .public-profile__hero {
+    @apply mb-10 flex flex-col items-center gap-3 text-center;
+  }
+  .public-profile__avatar {
+    @apply inline-flex h-14 w-14 items-center justify-center overflow-hidden rounded-full bg-primary text-primary-foreground shadow-card;
+  }
+  .public-profile__avatar-image {
+    @apply h-14 w-14 rounded-full object-cover;
+  }
+  .public-profile__title {
+    @apply font-display text-4xl;
+  }
+  .public-profile__bio {
+    @apply max-w-xl text-muted;
+  }
+
+  .profile-form {
+    @apply grid gap-4 rounded-xl border border-border bg-surface p-6 shadow-card;
+  }
+  .profile-form__avatar-panel {
+    @apply flex flex-wrap items-center gap-4 rounded-md border border-border bg-surface-muted p-4;
+  }
+  .profile-form__avatar-preview {
+    @apply inline-flex h-16 w-16 items-center justify-center overflow-hidden rounded-full bg-primary text-primary-foreground;
+  }
+  .profile-form__avatar-image {
+    @apply h-16 w-16 object-cover;
+  }
+  .profile-form__avatar-copy {
+    @apply min-w-0 flex-1;
+  }
+  .profile-form__avatar-title {
+    @apply text-sm font-semibold;
+  }
+  .profile-form__avatar-hint {
+    @apply text-xs text-muted;
+  }
+  .profile-form__actions {
+    @apply flex items-center justify-end gap-2;
+  }
+
+  .modal {
+    @apply fixed inset-0 z-50 flex items-end justify-center p-0 sm:items-center sm:p-6;
+  }
+  .modal__backdrop {
+    @apply absolute inset-0 animate-fade-in-up bg-ink/40 backdrop-blur-sm;
+  }
+  .modal__panel {
+    @apply relative flex max-h-[90vh] w-full animate-fade-in-up flex-col overflow-hidden rounded-t-xl bg-surface shadow-pop sm:rounded-xl;
+  }
+  .modal__panel--md {
+    @apply sm:max-w-lg;
+  }
+  .modal__panel--lg {
+    @apply sm:max-w-2xl;
+  }
+  .modal__header {
+    @apply flex items-start justify-between gap-4 border-b border-border px-5 py-4;
+  }
+  .modal__title-wrap {
+    @apply min-w-0;
+  }
+  .modal__title {
+    @apply text-lg font-semibold text-ink;
+  }
+  .modal__description {
+    @apply mt-1 text-sm text-muted;
+  }
+  .modal__body {
+    @apply overflow-y-auto px-5 py-5;
+  }
+  .modal__footer {
+    @apply flex items-center justify-end gap-2 border-t border-border px-5 py-4;
+  }
+
   .wish-card {
     @apply relative flex flex-col overflow-hidden rounded-lg bg-surface shadow-card transition-transform duration-200;
   }