diff --git a/src/pages/viewer/components/BookViewer.tsx b/src/pages/viewer/components/BookViewer.tsx
index 723a562..682c67a 100644
--- a/src/pages/viewer/components/BookViewer.tsx
+++ b/src/pages/viewer/components/BookViewer.tsx
@@ -1,4 +1,4 @@
-import { type FC, useRef, useCallback, useState, useEffect, useMemo } from 'react';
+import { type FC, useRef, useCallback, useState, useEffect, useLayoutEffect, useMemo, useSyncExternalStore } from 'react';
 import HTMLFlipBook from 'react-pageflip';
 import { type PageData } from '../types';
 import BookPage from './BookPage';
@@ -6,6 +6,22 @@ import { ArrowLeft2, ArrowRight2 } from 'iconsax-react';
 import { getPaperDimensions } from '@/config/paperSizes';
 
 const VIEWER_SCALE = 0.5;
+/** هم‌راستا با `md` تیلویند (768px) — موبایل: زیر این عرض */
+const MOBILE_QUERY = '(min-width: 768px)';
+
+function subscribeDesktopMql(callback: () => void) {
+    const mq = window.matchMedia(MOBILE_QUERY);
+    mq.addEventListener('change', callback);
+    return () => mq.removeEventListener('change', callback);
+}
+
+function useIsDesktop() {
+    return useSyncExternalStore(
+        subscribeDesktopMql,
+        () => window.matchMedia(MOBILE_QUERY).matches,
+        () => true
+    );
+}
 
 export type BookViewerProps = {
     pages: PageData[];
@@ -34,6 +50,7 @@ interface FlipEvent {
 const BookViewer: FC<BookViewerProps> = ({ pages, catalogSize }) => {
     const bookRef = useRef<FlipBookInstance | null>(null);
     const [currentPage, setCurrentPage] = useState(0);
+    const isDesktop = useIsDesktop();
 
     // سایز کتاب بر اساس catalogSize (A3/A4/A5)
     const { width: bookWidth, height: bookHeight } = useMemo(
@@ -43,8 +60,47 @@ const BookViewer: FC<BookViewerProps> = ({ pages, catalogSize }) => {
     const displayWidth = Math.round(bookWidth * VIEWER_SCALE);
     const displayHeight = Math.round(bookHeight * VIEWER_SCALE);
 
-    // scale محتوا همان VIEWER_SCALE است چون سایز کتاب با سایز محتوا یکی است
-    const contentScale = VIEWER_SCALE;
+    // موبایل: از ابعاد viewport برای جا دادن کتاب در صفحه
+    const [viewport, setViewport] = useState(() =>
+        typeof window !== 'undefined'
+            ? { w: window.innerWidth, h: window.innerHeight }
+            : { w: 1200, h: 800 }
+    );
+    useLayoutEffect(() => {
+        const onResize = () => setViewport({ w: window.innerWidth, h: window.innerHeight });
+        onResize();
+        window.addEventListener('resize', onResize);
+        window.addEventListener('orientationchange', onResize);
+        return () => {
+            window.removeEventListener('resize', onResize);
+            window.removeEventListener('orientationchange', onResize);
+        };
+    }, []);
+
+    const mobileFit = useMemo(() => {
+        if (isDesktop) return null;
+        const padX = 16;
+        const reservedNav = 120;
+        const maxW = Math.max(1, viewport.w - padX);
+        const maxH = Math.max(1, viewport.h - reservedNav);
+        const baseW = bookWidth * VIEWER_SCALE;
+        const baseH = bookHeight * VIEWER_SCALE;
+        const scale = Math.min(1, maxW / baseW, maxH / baseH);
+        return {
+            w: Math.max(1, Math.round(baseW * scale)),
+            h: Math.max(1, Math.round(baseH * scale)),
+            contentScale: VIEWER_SCALE * scale,
+        };
+    }, [isDesktop, bookWidth, bookHeight, viewport.w, viewport.h]);
+
+    // دسکتاپ: دقیقاً مثل قبل — موبایل: مقیاس‌شده
+    const pagePixelWidth = isDesktop ? displayWidth : (mobileFit?.w ?? displayWidth);
+    const pagePixelHeight = isDesktop ? displayHeight : (mobileFit?.h ?? displayHeight);
+    const contentScale = isDesktop ? VIEWER_SCALE : (mobileFit?.contentScale ?? VIEWER_SCALE);
+
+    const flipKey = isDesktop
+        ? 'desktop'
+        : `mobile-${pagePixelWidth}-${pagePixelHeight}`;
 
     // اطمینان از اینکه currentPage همیشه در محدوده معتبر است
     useEffect(() => {
@@ -157,42 +213,53 @@ const BookViewer: FC<BookViewerProps> = ({ pages, catalogSize }) => {
         }
     }, [currentPage, pages.length, goToNextPage, goToPrevPage]);
 
+    const usePortrait = !isDesktop;
+
     return (
-        <div className="flex flex-col items-center gap-4 md:gap-6 w-full h-full" dir="rtl">
-            {/* نمایش کتاب */}
-            <div className="relative w-full flex justify-center flex-1 items-center" style={{ overflow: 'hidden' }}>
-                {/* Border و Shadow عمودی در وسط کتاب */}
+        <div
+            className="flex flex-col items-center gap-4 md:gap-6 w-full h-full max-md:min-h-0 max-md:max-w-full max-md:overflow-x-hidden max-md:pb-[env(safe-area-inset-bottom,0px)]"
+            dir="rtl"
+        >
+            <div
+                className="relative w-full flex justify-center flex-1 max-md:min-h-0 items-center"
+                style={{ overflow: 'hidden' }}
+            >
+                {/* Border و Shadow عمودی در وسط (فقط دوسوّره/دسکتاپ) */}
                 <div
-                    className="absolute inset-y-0 left-1/2 -translate-x-1/2 w-px border-r border-gray-300 pointer-events-none z-50"
+                    className="hidden md:block absolute inset-y-0 left-1/2 -translate-x-1/2 w-px border-r border-gray-300 pointer-events-none z-50"
                     style={{
-                        boxShadow: '-5px 0 15px rgba(0, 0, 0, 0.15), 5px 0 15px rgba(0, 0, 0, 0.15)'
+                        boxShadow: '-5px 0 15px rgba(0, 0, 0, 0.15), 5px 0 15px rgba(0, 0, 0, 0.15)',
                     }}
                 />
-                <div style={{ overflow: 'hidden', isolation: 'isolate' }}>
+                <div
+                    className="max-w-full flex justify-center"
+                    style={{ overflow: 'hidden', isolation: 'isolate' }}
+                >
                     <HTMLFlipBook
+                        key={flipKey}
                         ref={bookRef}
-                        width={displayWidth}
-                        height={displayHeight}
+                        width={pagePixelWidth}
+                        height={pagePixelHeight}
                         size="fixed"
-                        minWidth={displayWidth}
-                        minHeight={displayHeight}
-                        maxWidth={displayWidth}
-                        maxHeight={displayHeight}
+                        minWidth={pagePixelWidth}
+                        minHeight={pagePixelHeight}
+                        maxWidth={pagePixelWidth}
+                        maxHeight={pagePixelHeight}
                         drawShadow={true}
                         flippingTime={800}
-                        usePortrait={false}
-                        startPage={0}
+                        usePortrait={usePortrait}
+                        startPage={currentPage}
                         autoSize={false}
                         maxShadowOpacity={0.5}
                         showCover={true}
-                        mobileScrollSupport={true}
+                        mobileScrollSupport={!usePortrait}
                         clickEventForward={true}
                         useMouseEvents={true}
-                        swipeDistance={30}
+                        swipeDistance={usePortrait ? 48 : 30}
                         startZIndex={1}
                         showPageCorners={true}
                         disableFlipByClick={true}
-                        className="flipbook-container mx-auto"
+                        className="flipbook-container mx-auto max-w-full"
                         style={{
                             direction: 'rtl',
                         }}
@@ -203,8 +270,8 @@ const BookViewer: FC<BookViewerProps> = ({ pages, catalogSize }) => {
                                 key={page.id}
                                 page={page}
                                 scale={contentScale}
-                                pageWidth={displayWidth}
-                                pageHeight={displayHeight}
+                                pageWidth={pagePixelWidth}
+                                pageHeight={pagePixelHeight}
                                 onLinkClick={handleLinkClick}
                             />
                         ))}
@@ -212,13 +279,13 @@ const BookViewer: FC<BookViewerProps> = ({ pages, catalogSize }) => {
                 </div>
             </div>
 
-            {/* کنترل‌های ناوبری */}
-            <div className="flex items-center gap-3 md:gap-6 bg-white rounded-full px-4 md:px-6 py-2 md:py-3 shadow-lg">
+            <div className="shrink-0 max-md:min-h-12 flex items-center gap-3 md:gap-6 bg-white rounded-full px-4 md:px-6 py-2 md:py-3 shadow-lg">
                 {/* دکمه صفحه بعد (در RTL، صفحه سمت چپ) */}
                 <button
+                    type="button"
                     onClick={goToNextPage}
                     disabled={currentPage <= 0}
-                    className="p-2 md:p-2 rounded-full hover:bg-gray-100 disabled:opacity-30 disabled:cursor-not-allowed transition-all"
+                    className="p-2 md:p-2 min-h-11 min-w-11 md:min-h-0 md:min-w-0 inline-flex items-center justify-center rounded-full hover:bg-gray-100 active:bg-gray-200 disabled:opacity-30 disabled:cursor-not-allowed transition-all"
                     aria-label="صفحه بعد"
                 >
                     <ArrowLeft2 size={20} className="text-gray-700 md:w-6 md:h-6" />
@@ -233,9 +300,10 @@ const BookViewer: FC<BookViewerProps> = ({ pages, catalogSize }) => {
 
                 {/* دکمه صفحه قبل (در RTL، صفحه سمت راست) */}
                 <button
+                    type="button"
                     onClick={goToPrevPage}
                     disabled={currentPage >= pages.length - 1}
-                    className="p-2 md:p-2 rounded-full hover:bg-gray-100 disabled:opacity-30 disabled:cursor-not-allowed transition-all"
+                    className="p-2 md:p-2 min-h-11 min-w-11 md:min-h-0 md:min-w-0 inline-flex items-center justify-center rounded-full hover:bg-gray-100 active:bg-gray-200 disabled:opacity-30 disabled:cursor-not-allowed transition-all"
                     aria-label="صفحه قبل"
                 >
                     <ArrowRight2 size={20} className="text-gray-700 md:w-6 md:h-6" />