diff --git a/AGENTS.md b/AGENTS.md
index 2f64c6f..7419eec 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -2727,6 +2727,13 @@ similar are internal endpoints/hook names, not credits — leave them.)
   `@fontsource/noto-sans-devanagari` (400/500/700) is **lazy-loaded** for `hi`
   via `lib/localeFonts.ts` (same pattern as CJK) and the CSS stack includes
   `'Noto Sans Devanagari'` before `system-ui`.
+- **Menu hardening across all locales:** the language dropdown is `w-72` with
+  `truncate` + a fixed 24px flag slot (SVG and emoji align); the settings
+  language grid is 1 column on phones / 2 on `sm+`; the header **More** menu is
+  `w-64`; the header nav scrolls (`overflow-x-auto scrollbar-hide`) so long
+  labels never push the logo/controls; the bottom nav truncates its labels.
+  `:lang(hi/th/ja/ko/zh)` removes `uppercase`/`tracking-wide`, because
+  Devanagari/Thai/CJK labels look broken when letter-spaced.
 - Translation sources were split by namespace into
   `/tmp/opencode/i18n-src/batch1..7.json` (regenerate from `en.ts` if
   re-translating). When adding new UI strings, add them to `en`/`es` **and all
diff --git a/src/components/LanguageToggle.tsx b/src/components/LanguageToggle.tsx
index e3185aa..12ef4e5 100644
--- a/src/components/LanguageToggle.tsx
+++ b/src/components/LanguageToggle.tsx
@@ -79,7 +79,11 @@ function Flag({ flag, className }: { flag: string; className?: string }) {
       />
     );
   }
-  return <span className={cn('text-lg leading-none', className)}>{flag}</span>;
+  return (
+    <span className={cn('inline-flex items-center justify-center text-lg leading-none', className)}>
+      {flag}
+    </span>
+  );
 }
 
 /**
@@ -124,11 +128,11 @@ export function LanguageToggle({ compact = false, inline = false, className, var
                 : 'text-muted-foreground hover:bg-muted hover:text-foreground'
             )}
           >
-            <Flag flag={lang.flag} />
-            <div className="flex flex-col">
-              <span className="font-medium">{lang.nativeName}</span>
+            <span className="flex h-5 w-6 shrink-0 items-center justify-center"><Flag flag={lang.flag} /></span>
+            <div className="flex min-w-0 flex-col">
+              <span className="truncate font-medium" title={lang.nativeName}>{lang.nativeName}</span>
               {lang.nativeName !== lang.name && (
-                <span className="text-xs opacity-70">{lang.name}</span>
+                <span className="truncate text-xs opacity-70" title={lang.name}>{lang.name}</span>
               )}
             </div>
             {language === lang.code && <span className="ml-auto text-primary">✓</span>}
@@ -166,7 +170,7 @@ export function LanguageToggle({ compact = false, inline = false, className, var
           )}
         </Button>
       </DropdownMenuTrigger>
-      <DropdownMenuContent align="end" className="w-48">
+      <DropdownMenuContent align="end" className="w-72">
         <div
           className="sticky top-0 z-10 -mx-1 -mt-1 mb-1 border-b bg-popover p-1"
           onKeyDown={(e) => e.stopPropagation()}
@@ -189,15 +193,15 @@ export function LanguageToggle({ compact = false, inline = false, className, var
               language === lang.code && 'bg-primary/10 text-primary'
             )}
           >
-            <Flag flag={lang.flag} />
-            <div className="flex flex-col">
-              <span className="font-medium">{lang.nativeName}</span>
+            <span className="flex h-5 w-6 shrink-0 items-center justify-center"><Flag flag={lang.flag} /></span>
+            <div className="flex min-w-0 flex-col">
+              <span className="truncate font-medium" title={lang.nativeName}>{lang.nativeName}</span>
               {lang.nativeName !== lang.name && (
-                <span className="text-xs text-muted-foreground">{lang.name}</span>
+                <span className="truncate text-xs text-muted-foreground" title={lang.name}>{lang.name}</span>
               )}
             </div>
             {language === lang.code && (
-              <span className="ml-auto text-primary">✓</span>
+              <span className="ml-auto shrink-0 text-primary">✓</span>
             )}
           </DropdownMenuItem>
         ))}
@@ -220,23 +224,25 @@ export function LanguageSelector() {
   return (
     <div className="space-y-3">
       <label className="text-sm font-medium">{t('settings.selectLanguage')}</label>
-      <div className="grid grid-cols-2 gap-3">
+      <div className="grid grid-cols-1 gap-3 sm:grid-cols-2">
         {languages.map((lang) => (
           <button
             key={lang.code}
             onClick={() => setLanguage(lang.code)}
             className={cn(
-              'flex items-center gap-3 p-4 rounded-xl border-2 transition-all',
+              'flex items-center gap-3 p-4 rounded-xl border-2 text-left transition-all',
               language === lang.code
                 ? 'border-primary bg-primary/10 shadow-lg shadow-primary/20'
                 : 'border-border hover:border-primary/50 hover:bg-muted/50'
             )}
           >
-            <span className="text-2xl">{lang.flag}</span>
-            <div className="text-left">
-              <div className="font-bold">{lang.nativeName}</div>
+            <span className="flex h-7 w-9 shrink-0 items-center justify-center">
+              <Flag flag={lang.flag} className="h-6 w-9" />
+            </span>
+            <div className="min-w-0 text-left">
+              <div className="truncate font-bold" title={lang.nativeName}>{lang.nativeName}</div>
               {lang.nativeName !== lang.name && (
-                <div className="text-xs text-muted-foreground">{lang.name}</div>
+                <div className="truncate text-xs text-muted-foreground" title={lang.name}>{lang.name}</div>
               )}
             </div>
           </button>
diff --git a/src/components/Layout.tsx b/src/components/Layout.tsx
index 2985fb3..ac78241 100644
--- a/src/components/Layout.tsx
+++ b/src/components/Layout.tsx
@@ -623,7 +623,7 @@ export function Layout({ children, noPadding }: LayoutProps) {
                   {t('nav.more')}
                 </Button>
               </DropdownMenuTrigger>
-              <DropdownMenuContent align="end" className="w-48">
+              <DropdownMenuContent align="end" className="w-64">
                 {/* Catalog items the user hasn't pinned to the top bar.
                     Auth-only items (stash/collections/contacts/wallet/messages)
                     only show when logged in. */}
diff --git a/src/index.css b/src/index.css
index 1963df5..66c5538 100644
--- a/src/index.css
+++ b/src/index.css
@@ -914,3 +914,24 @@ select {
   .ss-sheet-table td.ss-cell-name > input { max-width: 100%; }
   .ss-sheet-table td.ss-cell-actions { justify-content: flex-end; padding-top: 0.35rem; }
 }
+
+/* ── Caseless scripts ─────────────────────────────────────────────────────
+   The nav/menu labels use `uppercase tracking-wide` for the Latin UI. Those
+   classes are no-ops or actively wrong for Devanagari, Thai and CJK: letter
+   spacing separates conjuncts and uppercase does nothing. Keep the labels
+   natural when the document language is one of those. */
+:lang(hi) .uppercase,
+:lang(th) .uppercase,
+:lang(ja) .uppercase,
+:lang(ko) .uppercase,
+:lang(zh) .uppercase {
+  text-transform: none;
+}
+
+:lang(hi) .tracking-wide,
+:lang(th) .tracking-wide,
+:lang(ja) .tracking-wide,
+:lang(ko) .tracking-wide,
+:lang(zh) .tracking-wide {
+  letter-spacing: 0;
+}