diff --git a/components/email/calendar-invitation-banner.tsx b/components/email/calendar-invitation-banner.tsx
index e3293e2c..9b8b0fe4 100644
--- a/components/email/calendar-invitation-banner.tsx
+++ b/components/email/calendar-invitation-banner.tsx
@@ -20,6 +20,7 @@ import {
 } from 'lucide-react';
 import { useTranslations, useFormatter } from 'next-intl';
 import { useRouter } from '@/i18n/navigation';
+import { isDocumentRTL } from '@/i18n/direction';
 import { useAuthStore } from '@/stores/auth-store';
 import { useCalendarStore } from '@/stores/calendar-store';
 import { useSettingsStore } from '@/stores/settings-store';
@@ -374,7 +375,7 @@ export function CalendarInvitationBanner({ email }: CalendarInvitationBannerProp
   const [actionError, setActionError] = useState<string | null>(null);
   const [isProcessing, setIsProcessing] = useState(false);
   const [showCalendarPicker, setShowCalendarPicker] = useState(false);
-  const [pickerPosition, setPickerPosition] = useState<{ top: number; left: number } | null>(null);
+  const [pickerPosition, setPickerPosition] = useState<{ top: number; left?: number; right?: number } | null>(null);
   const pickerTriggerRef = useRef<HTMLButtonElement>(null);
   const [selectedCalendarId, setSelectedCalendarId] = useState<string>('');
   const [rawIcsMethod, setRawIcsMethod] = useState<InvitationMethod>('unknown');
@@ -1026,7 +1027,11 @@ export function CalendarInvitationBanner({ email }: CalendarInvitationBannerProp
                   }
                   if (pickerTriggerRef.current) {
                     const rect = pickerTriggerRef.current.getBoundingClientRect();
-                    setPickerPosition({ top: rect.bottom + 4, left: rect.left });
+                    setPickerPosition(
+                      isDocumentRTL()
+                        ? { top: rect.bottom + 4, right: window.innerWidth - rect.right }
+                        : { top: rect.bottom + 4, left: rect.left }
+                    );
                   }
                   setShowCalendarPicker(true);
                 }}
@@ -1041,7 +1046,7 @@ export function CalendarInvitationBanner({ email }: CalendarInvitationBannerProp
               {showCalendarPicker && calendars.length > 1 && pickerPosition && typeof document !== 'undefined' && createPortal(
                 <div
                   className="fixed w-52 bg-background rounded-lg shadow-lg border border-border z-50 py-1"
-                  style={{ top: pickerPosition.top, left: pickerPosition.left }}
+                  style={{ top: pickerPosition.top, left: pickerPosition.left, right: pickerPosition.right }}
                 >
                   <div className="px-3 py-1.5 text-xs font-medium text-muted-foreground">
                     {t('select_calendar')}
diff --git a/components/layout/account-switcher.tsx b/components/layout/account-switcher.tsx
index f8c1d6c6..5c55fbc5 100644
--- a/components/layout/account-switcher.tsx
+++ b/components/layout/account-switcher.tsx
@@ -7,6 +7,7 @@ import { useTranslations } from "next-intl";
 import { useAccountStore, type AccountEntry } from "@/stores/account-store";
 import { useAuthStore } from "@/stores/auth-store";
 import { getMaxAccounts, sortDefaultFirst, reorderNonDefaultIds } from "@/lib/account-utils";
+import { isDocumentRTL } from "@/i18n/direction";
 import { cn } from "@/lib/utils";
 import { useRouter } from "@/i18n/navigation";
 import { Avatar } from "@/components/ui/avatar";
@@ -54,18 +55,35 @@ export function AccountSwitcher({ variant = "rail", className }: AccountSwitcher
   const updatePosition = useCallback(() => {
     if (!buttonRef.current) return;
     const rect = buttonRef.current.getBoundingClientRect();
+    const rtl = isDocumentRTL();
     if (variant === "rail") {
-      setPopoverStyle({
-        position: "fixed",
-        left: rect.right + 8,
-        bottom: Math.max(8, window.innerHeight - rect.bottom),
-      });
+      setPopoverStyle(
+        rtl
+          ? {
+              position: "fixed",
+              right: window.innerWidth - rect.left + 8,
+              bottom: Math.max(8, window.innerHeight - rect.bottom),
+            }
+          : {
+              position: "fixed",
+              left: rect.right + 8,
+              bottom: Math.max(8, window.innerHeight - rect.bottom),
+            }
+      );
     } else {
-      setPopoverStyle({
-        position: "fixed",
-        left: rect.left,
-        top: rect.bottom + 4,
-      });
+      setPopoverStyle(
+        rtl
+          ? {
+              position: "fixed",
+              right: window.innerWidth - rect.right,
+              top: rect.bottom + 4,
+            }
+          : {
+              position: "fixed",
+              left: rect.left,
+              top: rect.bottom + 4,
+            }
+      );
     }
   }, [variant]);
 
diff --git a/components/layout/navigation-rail.tsx b/components/layout/navigation-rail.tsx
index 5cc3e869..f2bade53 100644
--- a/components/layout/navigation-rail.tsx
+++ b/components/layout/navigation-rail.tsx
@@ -18,6 +18,7 @@ import { useAccountStore } from "@/stores/account-store";
 import { useUpdateStore, selectHasUpdate } from "@/stores/update-store";
 import { getActiveAccountSlotHeaders } from "@/lib/auth/active-account-slot";
 import { getMaxAccounts } from "@/lib/account-utils";
+import { isDocumentRTL } from "@/i18n/direction";
 import { cn, formatFileSize } from "@/lib/utils";
 import { PluginSlot } from "@/components/plugins/plugin-slot";
 import { KeyboardShortcutsModal } from "@/components/keyboard-shortcuts-modal";
@@ -70,11 +71,19 @@ function StorageQuotaCircle({ quota, usagePercent }: { quota: { used: number; to
   const updatePosition = useCallback(() => {
     if (!buttonRef.current) return;
     const rect = buttonRef.current.getBoundingClientRect();
-    setPopoverStyle({
-      position: "fixed",
-      left: rect.right + 8,
-      bottom: window.innerHeight - rect.bottom,
-    });
+    setPopoverStyle(
+      isDocumentRTL()
+        ? {
+            position: "fixed",
+            right: window.innerWidth - rect.left + 8,
+            bottom: window.innerHeight - rect.bottom,
+          }
+        : {
+            position: "fixed",
+            left: rect.right + 8,
+            bottom: window.innerHeight - rect.bottom,
+          }
+    );
   }, []);
 
   useEffect(() => {
@@ -218,11 +227,19 @@ export function NavigationRail({
   const updateLogoutPosition = useCallback(() => {
     if (!logoutBtnRef.current) return;
     const rect = logoutBtnRef.current.getBoundingClientRect();
-    setLogoutPopoverStyle({
-      position: "fixed",
-      left: rect.right + 8,
-      bottom: Math.max(8, window.innerHeight - rect.bottom),
-    });
+    setLogoutPopoverStyle(
+      isDocumentRTL()
+        ? {
+            position: "fixed",
+            right: window.innerWidth - rect.left + 8,
+            bottom: Math.max(8, window.innerHeight - rect.bottom),
+          }
+        : {
+            position: "fixed",
+            left: rect.right + 8,
+            bottom: Math.max(8, window.innerHeight - rect.bottom),
+          }
+    );
   }, []);
 
   useEffect(() => {
diff --git a/i18n/direction.ts b/i18n/direction.ts
index ce7bcb3f..dadfcac7 100644
--- a/i18n/direction.ts
+++ b/i18n/direction.ts
@@ -4,3 +4,13 @@ const rtlLocales = new Set(['ar', 'he', 'fa']);
 export function getLocaleDirection(locale: string): 'ltr' | 'rtl' {
   return rtlLocales.has(locale) ? 'rtl' : 'ltr';
 }
+
+/**
+ * Whether the document is currently rendering right-to-left. For popovers
+ * positioned in JS via getBoundingClientRect() (Tailwind's logical start-0/
+ * end-0 utilities don't apply to inline fixed-position styles), check this
+ * to anchor on the correct physical side.
+ */
+export function isDocumentRTL(): boolean {
+  return typeof document !== 'undefined' && document.documentElement.dir === 'rtl';
+}