diff --git a/src/app/api/komga/images/books/[bookId]/pages/[pageNumber]/thumbnail/route.ts b/src/app/api/komga/images/books/[bookId]/pages/[pageNumber]/thumbnail/route.ts
index 88031e6..380cb50 100644
--- a/src/app/api/komga/images/books/[bookId]/pages/[pageNumber]/thumbnail/route.ts
+++ b/src/app/api/komga/images/books/[bookId]/pages/[pageNumber]/thumbnail/route.ts
@@ -15,15 +15,7 @@ export async function GET(
     }
 
     const response = await BookService.getPageThumbnail(params.bookId, pageNumber);
-    const buffer = await response.arrayBuffer();
-    const headers = new Headers();
-    headers.set("Content-Type", response.headers.get("Content-Type") || "image/jpeg");
-    headers.set("Cache-Control", "public, max-age=31536000"); // Cache for 1 year
-
-    return new NextResponse(buffer, {
-      status: 200,
-      headers,
-    });
+    return response;
   } catch (error) {
     console.error("API Book Page Thumbnail - Erreur:", error);
     return NextResponse.json(
diff --git a/src/app/api/komga/images/books/[bookId]/thumbnail/route.ts b/src/app/api/komga/images/books/[bookId]/thumbnail/route.ts
index 0c9831e..ef228fe 100644
--- a/src/app/api/komga/images/books/[bookId]/thumbnail/route.ts
+++ b/src/app/api/komga/images/books/[bookId]/thumbnail/route.ts
@@ -3,7 +3,7 @@ import { BookService } from "@/lib/services/book.service";
 
 export async function GET(request: NextRequest, { params }: { params: { bookId: string } }) {
   try {
-    const response = await BookService.getThumbnail(params.bookId);
+    const response = await BookService.getCover(params.bookId);
     return response;
   } catch (error) {
     console.error("Erreur lors de la récupération de la miniature du livre:", error);
diff --git a/src/app/api/komga/images/series/[seriesId]/first-page/route.ts b/src/app/api/komga/images/series/[seriesId]/first-page/route.ts
index 5d2bf80..a8b62fc 100644
--- a/src/app/api/komga/images/series/[seriesId]/first-page/route.ts
+++ b/src/app/api/komga/images/series/[seriesId]/first-page/route.ts
@@ -5,10 +5,10 @@ export const dynamic = "force-dynamic";
 
 export async function GET(request: NextRequest, { params }: { params: { seriesId: string } }) {
   try {
-    const response = await SeriesService.getFirstPage(params.seriesId);
+    const response = await SeriesService.getCover(params.seriesId);
     return response;
   } catch (error) {
-    console.error("Erreur lors de la récupération de la première page de la série:", error);
-    return new NextResponse("Erreur lors de la récupération de l'image", { status: 500 });
+    console.error("Erreur lors de la récupération de la couverture de la série:", error);
+    return new NextResponse("Erreur lors de la récupération de la couverture", { status: 500 });
   }
 }
diff --git a/src/app/api/komga/images/series/[seriesId]/thumbnail/route.ts b/src/app/api/komga/images/series/[seriesId]/thumbnail/route.ts
index bf568cd..23472d9 100644
--- a/src/app/api/komga/images/series/[seriesId]/thumbnail/route.ts
+++ b/src/app/api/komga/images/series/[seriesId]/thumbnail/route.ts
@@ -3,7 +3,7 @@ import { SeriesService } from "@/lib/services/series.service";
 
 export async function GET(request: NextRequest, { params }: { params: { seriesId: string } }) {
   try {
-    const response = await SeriesService.getThumbnail(params.seriesId);
+    const response = await SeriesService.getCover(params.seriesId);
     return response;
   } catch (error) {
     console.error("Erreur lors de la récupération de la miniature de la série:", error);
diff --git a/src/components/home/HeroSection.tsx b/src/components/home/HeroSection.tsx
index 92f7e25..c537b13 100644
--- a/src/components/home/HeroSection.tsx
+++ b/src/components/home/HeroSection.tsx
@@ -1,11 +1,7 @@
 "use client";
 
 import { KomgaSeries } from "@/types/komga";
-import Image from "next/image";
-import { useState } from "react";
-import { ImageOff } from "lucide-react";
-import { cn } from "@/lib/utils";
-import { ImageLoader } from "@/components/ui/image-loader";
+import { Cover } from "@/components/ui/cover";
 
 interface HeroSectionProps {
   series: KomgaSeries[];
@@ -22,7 +18,18 @@ export function HeroSection({ series }: HeroSectionProps) {
       {/* Grille de couvertures en arrière-plan */}
       <div className="absolute inset-0 grid grid-cols-2 sm:grid-cols-3 md:grid-cols-4 lg:grid-cols-6 gap-4 p-4 opacity-10">
         {series?.map((series) => (
-          <CoverImage key={series.id} series={series} />
+          <div
+            key={series.id}
+            className="relative aspect-[2/3] bg-muted rounded-lg overflow-hidden"
+          >
+            <Cover
+              type="series"
+              id={series.id}
+              alt={`Couverture de ${series.metadata.title}`}
+              quality={25}
+              sizes="(max-width: 640px) 50vw, (max-width: 1024px) 33vw, 16.666vw"
+            />
+          </div>
         ))}
       </div>
 
@@ -41,40 +48,3 @@ export function HeroSection({ series }: HeroSectionProps) {
     </div>
   );
 }
-
-interface CoverImageProps {
-  series: KomgaSeries;
-}
-
-function CoverImage({ series }: CoverImageProps) {
-  const [imageError, setImageError] = useState(false);
-  const [imageLoading, setImageLoading] = useState(true);
-
-  return (
-    <div className="relative aspect-[2/3] bg-muted rounded-lg overflow-hidden">
-      {!imageError ? (
-        <>
-          <ImageLoader isLoading={imageLoading} />
-          <Image
-            src={`/api/komga/images/series/${series.id}/thumbnail`}
-            alt={`Couverture de ${series.metadata.title}`}
-            fill
-            className={cn(
-              "object-cover transition-opacity duration-300",
-              imageLoading ? "opacity-0" : "opacity-100"
-            )}
-            sizes="(max-width: 640px) 50vw, (max-width: 1024px) 33vw, 16.666vw"
-            loading="lazy"
-            quality={25}
-            onError={() => setImageError(true)}
-            onLoad={() => setImageLoading(false)}
-          />
-        </>
-      ) : (
-        <div className="w-full h-full flex items-center justify-center">
-          <ImageOff className="w-8 h-8" />
-        </div>
-      )}
-    </div>
-  );
-}
diff --git a/src/components/home/MediaRow.tsx b/src/components/home/MediaRow.tsx
index e01e051..adfe2e1 100644
--- a/src/components/home/MediaRow.tsx
+++ b/src/components/home/MediaRow.tsx
@@ -1,11 +1,9 @@
 "use client";
 
 import { KomgaBook, KomgaSeries } from "@/types/komga";
-import { ChevronLeft, ChevronRight, ImageOff } from "lucide-react";
-import Image from "next/image";
+import { ChevronLeft, ChevronRight } from "lucide-react";
 import { useRef, useState } from "react";
-import { cn } from "@/lib/utils";
-import { ImageLoader } from "@/components/ui/image-loader";
+import { Cover } from "@/components/ui/cover";
 
 interface MediaRowProps {
   title: string;
@@ -82,9 +80,6 @@ interface MediaCardProps {
 }
 
 function MediaCard({ item, onClick }: MediaCardProps) {
-  const [imageError, setImageError] = useState(false);
-  const [imageLoading, setImageLoading] = useState(true);
-
   // Déterminer si c'est une série ou un livre
   const isSeries = "booksCount" in item;
   const title = isSeries
@@ -107,32 +102,13 @@ function MediaCard({ item, onClick }: MediaCardProps) {
     >
       {/* Image de couverture */}
       <div className="relative aspect-[2/3] bg-muted">
-        {!imageError ? (
-          <>
-            <ImageLoader isLoading={imageLoading} />
-            <Image
-              src={`/api/komga/images/${isSeries ? "series" : "books"}/${item.id}/${
-                isSeries ? "first-page" : "pages/1"
-              }`}
-              alt={`Couverture de ${title}`}
-              fill
-              className={cn(
-                "object-cover transition-opacity duration-300",
-                imageLoading ? "opacity-0" : "opacity-100"
-              )}
-              sizes="200px"
-              loading="lazy"
-              quality={100}
-              onError={() => setImageError(true)}
-              onLoad={() => setImageLoading(false)}
-            />
-          </>
-        ) : (
-          <div className="w-full h-full flex items-center justify-center">
-            <ImageOff className="w-12 h-12" />
-          </div>
-        )}
-
+        <Cover
+          type={isSeries ? "series" : "book"}
+          id={item.id}
+          alt={`Couverture de ${title}`}
+          sizes="200px"
+          quality={100}
+        />
         {/* Overlay avec les informations au survol */}
         <div className="absolute inset-0 bg-black/60 opacity-0 hover:opacity-100 transition-opacity duration-200 flex flex-col justify-end p-3">
           <h3 className="font-medium text-sm text-white line-clamp-2">{title}</h3>
diff --git a/src/components/library/LibraryGrid.tsx b/src/components/library/LibraryGrid.tsx
index cae0a57..9322d24 100644
--- a/src/components/library/LibraryGrid.tsx
+++ b/src/components/library/LibraryGrid.tsx
@@ -1,12 +1,10 @@
 import { KomgaLibrary } from "@/types/komga";
-import { Book, ImageOff } from "lucide-react";
-import Image from "next/image";
-import { useState } from "react";
+import { Book } from "lucide-react";
+import { Cover } from "@/components/ui/cover";
 
 interface LibraryGridProps {
   libraries: KomgaLibrary[];
   onLibraryClick?: (library: KomgaLibrary) => void;
-  getLibraryThumbnailUrl: (libraryId: string) => string;
 }
 
 // Fonction utilitaire pour formater la date de manière sécurisée
@@ -27,11 +25,7 @@ const formatDate = (dateString: string): string => {
   }
 };
 
-export function LibraryGrid({
-  libraries,
-  onLibraryClick,
-  getLibraryThumbnailUrl,
-}: LibraryGridProps) {
+export function LibraryGrid({ libraries, onLibraryClick }: LibraryGridProps) {
   if (!libraries.length) {
     return (
       <div className="text-center p-8">
@@ -43,12 +37,7 @@ export function LibraryGrid({
   return (
     <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-3">
       {libraries.map((library) => (
-        <LibraryCard
-          key={library.id}
-          library={library}
-          onClick={() => onLibraryClick?.(library)}
-          getLibraryThumbnailUrl={getLibraryThumbnailUrl}
-        />
+        <LibraryCard key={library.id} library={library} onClick={() => onLibraryClick?.(library)} />
       ))}
     </div>
   );
@@ -57,12 +46,9 @@ export function LibraryGrid({
 interface LibraryCardProps {
   library: KomgaLibrary;
   onClick?: () => void;
-  getLibraryThumbnailUrl: (libraryId: string) => string;
 }
 
-function LibraryCard({ library, onClick, getLibraryThumbnailUrl }: LibraryCardProps) {
-  const [imageError, setImageError] = useState(false);
-
+function LibraryCard({ library, onClick }: LibraryCardProps) {
   return (
     <button
       onClick={onClick}
@@ -70,20 +56,15 @@ function LibraryCard({ library, onClick, getLibraryThumbnailUrl }: LibraryCardPr
     >
       {/* Image de couverture */}
       <div className="absolute inset-0 bg-muted">
-        {!imageError ? (
-          <Image
-            src={getLibraryThumbnailUrl(library.id)}
+        <div className="w-full h-full opacity-20 group-hover:opacity-30 transition-opacity">
+          <Cover
+            type="series"
+            id={library.id}
             alt={`Couverture de ${library.name}`}
-            fill
-            className="object-cover opacity-20 group-hover:opacity-30 transition-opacity"
             sizes="(max-width: 640px) 100vw, (max-width: 1024px) 50vw, 33vw"
-            onError={() => setImageError(true)}
+            quality={25}
           />
-        ) : (
-          <div className="w-full h-full flex items-center justify-center opacity-20">
-            <ImageOff className="w-12 h-12" />
-          </div>
-        )}
+        </div>
       </div>
 
       {/* Contenu */}
diff --git a/src/components/library/SeriesGrid.tsx b/src/components/library/SeriesGrid.tsx
index a7a0387..b1067ce 100644
--- a/src/components/library/SeriesGrid.tsx
+++ b/src/components/library/SeriesGrid.tsx
@@ -1,32 +1,33 @@
 "use client";
 
 import { KomgaSeries } from "@/types/komga";
-import { Book, ImageOff, Loader2 } from "lucide-react";
-import Image from "next/image";
-import { useState } from "react";
 import { useRouter } from "next/navigation";
-import { ImageLoader } from "@/components/ui/image-loader";
 import { cn } from "@/lib/utils";
+import { Cover } from "@/components/ui/cover";
 
 interface SeriesGridProps {
   series: KomgaSeries[];
 }
 
-// Fonction utilitaire pour obtenir les informations de lecture d'une série
+// Fonction utilitaire pour obtenir les informations de statut de lecture
 const getReadingStatusInfo = (series: KomgaSeries) => {
-  const { booksCount, booksReadCount, booksUnreadCount } = series;
-  const booksInProgressCount = booksCount - (booksReadCount + booksUnreadCount);
+  if (series.booksCount === 0) {
+    return {
+      label: "Pas de tomes",
+      className: "bg-yellow-500/10 text-yellow-500",
+    };
+  }
 
-  if (booksReadCount === booksCount) {
+  if (series.booksCount === series.booksReadCount) {
     return {
       label: "Lu",
       className: "bg-green-500/10 text-green-500",
     };
   }
 
-  if (booksInProgressCount > 0 || (booksReadCount > 0 && booksReadCount < booksCount)) {
+  if (series.booksReadCount > 0) {
     return {
-      label: `${booksReadCount}/${booksCount}`,
+      label: `${series.booksReadCount}/${series.booksCount}`,
       className: "bg-blue-500/10 text-blue-500",
     };
   }
@@ -51,74 +52,37 @@ export function SeriesGrid({ series }: SeriesGridProps) {
   return (
     <div className="grid grid-cols-2 gap-4 sm:grid-cols-3 lg:grid-cols-5">
       {series.map((series) => (
-        <SeriesCard
+        <button
           key={series.id}
-          series={series}
           onClick={() => router.push(`/series/${series.id}`)}
-        />
+          className={cn(
+            "group relative aspect-[2/3] overflow-hidden rounded-lg bg-muted",
+            series.booksCount === series.booksReadCount && "opacity-50"
+          )}
+        >
+          <Cover
+            type="series"
+            id={series.id}
+            alt={`Couverture de ${series.metadata.title}`}
+            isCompleted={series.booksCount === series.booksReadCount}
+          />
+          <div className="absolute inset-x-0 bottom-0 bg-gradient-to-t from-black/60 to-transparent p-4 space-y-2 translate-y-full group-hover:translate-y-0 transition-transform duration-200">
+            <h3 className="font-medium text-sm text-white line-clamp-2">{series.metadata.title}</h3>
+            <div className="flex items-center gap-2">
+              <span
+                className={`px-2 py-0.5 rounded-full text-xs ${
+                  getReadingStatusInfo(series).className
+                }`}
+              >
+                {getReadingStatusInfo(series).label}
+              </span>
+              <span className="text-xs text-white/80">
+                {series.booksCount} tome{series.booksCount > 1 ? "s" : ""}
+              </span>
+            </div>
+          </div>
+        </button>
       ))}
     </div>
   );
 }
-
-interface SeriesCardProps {
-  series: KomgaSeries;
-  onClick?: () => void;
-}
-
-function SeriesCard({ series, onClick }: SeriesCardProps) {
-  const [imageError, setImageError] = useState(false);
-  const [isLoading, setIsLoading] = useState(true);
-  const statusInfo = getReadingStatusInfo(series);
-  const isCompleted = series.booksCount === series.booksReadCount;
-
-  return (
-    <button
-      onClick={onClick}
-      className={cn(
-        "group relative aspect-[2/3] overflow-hidden rounded-lg bg-muted",
-        isCompleted && "opacity-50"
-      )}
-    >
-      {!imageError ? (
-        <>
-          <ImageLoader isLoading={isLoading} />
-          <Image
-            src={`/api/komga/images/series/${series.id}/first-page`}
-            alt={`Couverture de ${series.metadata.title}`}
-            fill
-            className={cn(
-              "object-cover transition-opacity duration-300",
-              isLoading ? "opacity-0" : "opacity-100"
-            )}
-            sizes="(max-width: 640px) 33vw, (max-width: 1024px) 20vw, 20vw"
-            onError={() => setImageError(true)}
-            onLoad={() => setIsLoading(false)}
-            loading="lazy"
-            quality={80}
-            unoptimized
-            priority={false}
-            fetchPriority="low"
-          />
-        </>
-      ) : (
-        <div className="w-full h-full flex items-center justify-center">
-          <ImageOff className="w-12 h-12 text-muted-foreground" />
-        </div>
-      )}
-
-      {/* Overlay avec les informations au survol */}
-      <div className="absolute inset-x-0 bottom-0 bg-gradient-to-t from-black/60 to-transparent p-4 space-y-2 translate-y-full group-hover:translate-y-0 transition-transform duration-200">
-        <h3 className="font-medium text-sm text-white line-clamp-2">{series.metadata.title}</h3>
-        <div className="flex items-center gap-2">
-          <span className={`px-2 py-0.5 rounded-full text-xs ${statusInfo.className}`}>
-            {statusInfo.label}
-          </span>
-          <span className="text-xs text-white/80">
-            {series.booksCount} tome{series.booksCount > 1 ? "s" : ""}
-          </span>
-        </div>
-      </div>
-    </button>
-  );
-}
diff --git a/src/components/series/BookGrid.tsx b/src/components/series/BookGrid.tsx
index edc5efd..2914c18 100644
--- a/src/components/series/BookGrid.tsx
+++ b/src/components/series/BookGrid.tsx
@@ -1,12 +1,8 @@
 "use client";
 
 import { KomgaBook } from "@/types/komga";
-import { ImageOff, Loader2 } from "lucide-react";
-import Image from "next/image";
-import { useState } from "react";
 import { formatDate } from "@/lib/utils";
-import { ImageLoader } from "@/components/ui/image-loader";
-import { cn } from "@/lib/utils";
+import { Cover } from "@/components/ui/cover";
 
 interface BookGridProps {
   books: KomgaBook[];
@@ -62,7 +58,12 @@ export function BookGrid({ books, onBookClick }: BookGridProps) {
             onClick={() => onBookClick(book)}
             className="group relative aspect-[2/3] overflow-hidden rounded-lg bg-muted hover:opacity-100 transition-all"
           >
-            <BookImage book={book} isCompleted={book.readProgress?.completed} />
+            <Cover
+              type="book"
+              id={book.id}
+              alt={`Couverture de ${book.metadata.title || `Tome ${book.metadata.number}`}`}
+              isCompleted={book.readProgress?.completed}
+            />
             <div className="absolute inset-x-0 bottom-0 bg-gradient-to-t from-black/60 to-transparent p-4 space-y-2 translate-y-full group-hover:translate-y-0 transition-transform duration-200">
               <p className="text-sm font-medium text-white text-left line-clamp-2">
                 {book.metadata.title || `Tome ${book.metadata.number}`}
@@ -79,131 +80,3 @@ export function BookGrid({ books, onBookClick }: BookGridProps) {
     </div>
   );
 }
-
-interface BookImageProps {
-  book: KomgaBook;
-  isCompleted?: boolean;
-}
-
-function BookImage({ book, isCompleted }: BookImageProps) {
-  const [imageError, setImageError] = useState(false);
-  const [isLoading, setIsLoading] = useState(true);
-
-  if (imageError) {
-    return (
-      <div className="w-full h-full flex items-center justify-center">
-        <ImageOff className="w-12 h-12 text-muted-foreground" />
-      </div>
-    );
-  }
-
-  return (
-    <>
-      <ImageLoader isLoading={isLoading} />
-      <Image
-        src={`/api/komga/images/books/${book.id}/pages/1`}
-        alt={`Couverture de ${book.metadata.title || `Tome ${book.metadata.number}`}`}
-        fill
-        className={cn(
-          "object-cover transition-opacity duration-300",
-          isLoading ? "opacity-0" : "opacity-100",
-          isCompleted && "opacity-50"
-        )}
-        sizes="(max-width: 640px) 33vw, (max-width: 1024px) 20vw, 20vw"
-        onError={() => setImageError(true)}
-        onLoad={() => setIsLoading(false)}
-        loading="lazy"
-        quality={80}
-        unoptimized
-        priority={false}
-        fetchPriority="low"
-      />
-    </>
-  );
-}
-
-interface BookCardProps {
-  book: KomgaBook;
-  onClick?: () => void;
-  getBookThumbnailUrl: (bookId: string) => string;
-}
-
-function BookCard({ book, onClick, getBookThumbnailUrl }: BookCardProps) {
-  const [imageError, setImageError] = useState(false);
-
-  const getReadingStatusInfo = () => {
-    if (!book.readProgress) {
-      return {
-        label: "Non lu",
-        className: "bg-yellow-500/10 text-yellow-500",
-      };
-    }
-
-    if (book.readProgress.completed) {
-      const readDate = book.readProgress.readDate ? formatDate(book.readProgress.readDate) : null;
-      return {
-        label: readDate ? `Lu le ${readDate}` : "Lu",
-        className: "bg-green-500/10 text-green-500",
-      };
-    }
-
-    if (book.readProgress.page > 0) {
-      return {
-        label: `Page ${book.readProgress.page}/${book.media.pagesCount}`,
-        className: "bg-blue-500/10 text-blue-500",
-      };
-    }
-
-    return {
-      label: "Non lu",
-      className: "bg-yellow-500/10 text-yellow-500",
-    };
-  };
-
-  const statusInfo = getReadingStatusInfo();
-
-  return (
-    <button
-      onClick={onClick}
-      className="group relative flex flex-col rounded-lg border bg-card text-card-foreground shadow-sm hover:bg-accent hover:text-accent-foreground transition-colors overflow-hidden"
-    >
-      {/* Image de couverture */}
-      <div className="relative aspect-[2/3] bg-muted">
-        {!imageError ? (
-          <Image
-            src={getBookThumbnailUrl(book.id)}
-            alt={`Couverture de ${book.metadata.title}`}
-            fill
-            className="object-cover"
-            sizes="(max-width: 640px) 33vw, (max-width: 1024px) 16.666vw, 16.666vw"
-            onError={() => setImageError(true)}
-            loading="lazy"
-            quality={100}
-          />
-        ) : (
-          <div className="w-full h-full flex items-center justify-center">
-            <ImageOff className="w-12 w-12" />
-          </div>
-        )}
-      </div>
-
-      {/* Contenu */}
-      <div className="flex flex-col p-2">
-        <h3 className="font-medium line-clamp-2 text-sm">
-          {book.metadata.title || `Tome ${book.metadata.number}`}
-        </h3>
-        <div className="mt-1 text-xs text-muted-foreground space-y-1">
-          {book.metadata.releaseDate && (
-            <div>{new Date(book.metadata.releaseDate).toLocaleDateString()}</div>
-          )}
-          <div className="flex items-center">
-            <span className={`px-1.5 py-0.5 rounded-full text-[10px] ${statusInfo.className}`}>
-              {statusInfo.label}
-            </span>
-          </div>
-          {book.size && <div className="text-[10px]">{book.size}</div>}
-        </div>
-      </div>
-    </button>
-  );
-}
diff --git a/src/components/series/SeriesHeader.tsx b/src/components/series/SeriesHeader.tsx
index 478eb04..19b7652 100644
--- a/src/components/series/SeriesHeader.tsx
+++ b/src/components/series/SeriesHeader.tsx
@@ -1,70 +1,30 @@
 "use client";
 
-import Image from "next/image";
-import { ImageOff, Book, BookOpen, BookMarked, Star, StarOff } from "lucide-react";
+import { Book, BookOpen, BookMarked, Star, StarOff } from "lucide-react";
 import { KomgaSeries } from "@/types/komga";
 import { useState, useEffect } from "react";
 import { Button } from "../ui/button";
 import { useToast } from "@/components/ui/use-toast";
 import { cn } from "@/lib/utils";
-import { ImageLoader } from "@/components/ui/image-loader";
+import { Cover } from "@/components/ui/cover";
 
 interface SeriesHeaderProps {
   series: KomgaSeries;
   onSeriesUpdate?: (series: KomgaSeries) => void;
 }
 
-interface ReadingStatusInfo {
-  label: string;
-  className: string;
-  icon: React.ElementType;
-}
-
-// Fonction utilitaire pour obtenir les informations de lecture d'une série
-const getReadingStatusInfo = (series: KomgaSeries): ReadingStatusInfo => {
-  const { booksCount, booksReadCount, booksUnreadCount } = series;
-  const booksInProgressCount = booksCount - (booksReadCount + booksUnreadCount);
-
-  if (booksReadCount === booksCount) {
-    return {
-      label: "Lu",
-      className: "bg-green-500/10 text-green-500",
-      icon: BookOpen,
-    };
-  }
-
-  if (booksInProgressCount > 0 || (booksReadCount > 0 && booksReadCount < booksCount)) {
-    return {
-      label: `${booksReadCount}/${booksCount}`,
-      className: "bg-blue-500/10 text-blue-500",
-      icon: BookMarked,
-    };
-  }
-
-  return {
-    label: "Non lu",
-    className: "bg-yellow-500/10 text-yellow-500",
-    icon: Book,
-  };
-};
-
 export const SeriesHeader = ({ series, onSeriesUpdate }: SeriesHeaderProps) => {
   const { toast } = useToast();
-  const [languageDisplay, setLanguageDisplay] = useState<string>(series.metadata.language);
-  const [imageError, setImageError] = useState(false);
-  const [isLoading, setIsLoading] = useState(true);
   const [isFavorite, setIsFavorite] = useState(false);
-  const [mounted, setMounted] = useState(false);
-  const statusInfo = getReadingStatusInfo(series);
 
-  // Vérifier si la série est dans les favoris au chargement
   useEffect(() => {
+    // Vérifier si la série est dans les favoris
     const checkFavorite = async () => {
       try {
-        const response = await fetch("/api/komga/favorites");
+        const response = await fetch(`/api/komga/series/${series.id}/favorite`);
         if (response.ok) {
-          const favoriteIds = await response.json();
-          setIsFavorite(favoriteIds.includes(series.id));
+          const data = await response.json();
+          setIsFavorite(data.favorite);
         }
       } catch (error) {
         console.error("Erreur lors de la vérification des favoris:", error);
@@ -72,117 +32,94 @@ export const SeriesHeader = ({ series, onSeriesUpdate }: SeriesHeaderProps) => {
     };
 
     checkFavorite();
-    setMounted(true);
   }, [series.id]);
 
-  useEffect(() => {
-    try {
-      if (series.metadata.language) {
-        const displayNames = new Intl.DisplayNames([navigator.language || "fr-FR"], {
-          type: "language",
-        });
-        setLanguageDisplay(displayNames.of(series.metadata.language) || series.metadata.language);
-      }
-    } catch (error) {
-      console.error("Erreur lors de la traduction de la langue:", error);
-      setLanguageDisplay(series.metadata.language);
-    }
-  }, [series.metadata.language]);
-
   const handleToggleFavorite = async () => {
     try {
-      setIsLoading(true);
-      const response = await fetch("/api/komga/favorites", {
-        method: isFavorite ? "DELETE" : "POST",
+      const response = await fetch(`/api/komga/series/${series.id}/favorite`, {
+        method: "POST",
         headers: {
           "Content-Type": "application/json",
         },
-        body: JSON.stringify({ seriesId: series.id }),
+        body: JSON.stringify({ favorite: !isFavorite }),
       });
 
-      if (!response.ok) {
+      if (response.ok) {
+        setIsFavorite(!isFavorite);
+        toast({
+          title: !isFavorite ? "Ajouté aux favoris" : "Retiré des favoris",
+          description: series.metadata.title,
+        });
+      } else {
         throw new Error("Erreur lors de la modification des favoris");
       }
-
-      setIsFavorite(!isFavorite);
-      if (onSeriesUpdate) {
-        onSeriesUpdate({ ...series, favorite: !isFavorite });
-      }
-
-      // Dispatch l'événement pour notifier les autres composants
-      window.dispatchEvent(new Event("favoritesChanged"));
-
-      toast({
-        title: isFavorite ? "Retiré des favoris" : "Ajouté aux favoris",
-        variant: "default",
-      });
     } catch (error) {
+      console.error("Erreur lors de la modification des favoris:", error);
       toast({
-        title: "Une erreur est survenue",
+        title: "Erreur",
+        description: "Impossible de modifier les favoris",
         variant: "destructive",
       });
-    } finally {
-      setIsLoading(false);
     }
   };
 
+  const getReadingStatusInfo = () => {
+    const { booksCount, booksReadCount, booksUnreadCount } = series;
+    const booksInProgressCount = booksCount - (booksReadCount + booksUnreadCount);
+
+    if (booksReadCount === booksCount) {
+      return {
+        label: "Lu",
+        className: "bg-green-500/10 text-green-500",
+        icon: BookMarked,
+      };
+    }
+
+    if (booksInProgressCount > 0 || (booksReadCount > 0 && booksReadCount < booksCount)) {
+      return {
+        label: `${booksReadCount}/${booksCount}`,
+        className: "bg-blue-500/10 text-blue-500",
+        icon: BookOpen,
+      };
+    }
+
+    return {
+      label: "Non lu",
+      className: "bg-yellow-500/10 text-yellow-500",
+      icon: Book,
+    };
+  };
+
+  const statusInfo = getReadingStatusInfo();
+
   return (
     <div className="relative min-h-[300px] md:h-[300px] w-screen -ml-[calc((100vw-100%)/2)] overflow-hidden">
       {/* Image de fond */}
-      {!imageError ? (
-        <>
-          <ImageLoader isLoading={isLoading} />
-          <Image
-            src={`/api/komga/images/series/${series.id}/first-page`}
-            alt={`Couverture de ${series.metadata.title}`}
-            fill
-            className={cn(
-              "object-cover blur-sm scale-105 brightness-50 transition-opacity duration-300",
-              isLoading ? "opacity-0" : "opacity-100"
-            )}
-            sizes="100vw"
-            onError={() => setImageError(true)}
-            onLoad={() => setIsLoading(false)}
-            quality={60}
-            priority
-            unoptimized
-          />
-        </>
-      ) : (
-        <div className="absolute inset-0 bg-muted flex items-center justify-center">
-          <ImageOff className="w-12 h-12 text-muted-foreground" />
-        </div>
-      )}
+      <div className="absolute inset-0">
+        <Cover
+          type="series"
+          id={series.id}
+          alt={`Couverture de ${series.metadata.title}`}
+          className="blur-sm scale-105 brightness-50"
+          sizes="100vw"
+          quality={60}
+          priority
+        />
+      </div>
 
       {/* Contenu */}
       <div className="relative container mx-auto px-4 py-8">
         <div className="flex flex-col md:flex-row gap-6 items-center md:items-start w-full">
           {/* Image principale */}
           <div className="relative w-[180px] aspect-[2/3] rounded-lg overflow-hidden shadow-lg bg-muted flex-shrink-0">
-            {!imageError ? (
-              <>
-                <ImageLoader isLoading={isLoading} />
-                <Image
-                  src={`/api/komga/images/series/${series.id}/first-page`}
-                  alt={`Couverture de ${series.metadata.title}`}
-                  fill
-                  className={cn(
-                    "object-cover transition-opacity duration-300",
-                    isLoading ? "opacity-0" : "opacity-100"
-                  )}
-                  sizes="180px"
-                  onError={() => setImageError(true)}
-                  onLoad={() => setIsLoading(false)}
-                  quality={90}
-                  priority
-                  unoptimized
-                />
-              </>
-            ) : (
-              <div className="w-full h-full flex items-center justify-center">
-                <ImageOff className="w-12 h-12 text-muted-foreground" />
-              </div>
-            )}
+            <Cover
+              type="series"
+              id={series.id}
+              alt={`Couverture de ${series.metadata.title}`}
+              sizes="180px"
+              quality={90}
+              priority
+            />
           </div>
 
           {/* Informations */}
diff --git a/src/components/ui/cover.tsx b/src/components/ui/cover.tsx
new file mode 100644
index 0000000..dbdbc93
--- /dev/null
+++ b/src/components/ui/cover.tsx
@@ -0,0 +1,70 @@
+"use client";
+
+import { ImageOff } from "lucide-react";
+import Image from "next/image";
+import { useState } from "react";
+import { cn } from "@/lib/utils";
+import { ImageLoader } from "@/components/ui/image-loader";
+
+interface CoverProps {
+  type: "series" | "book";
+  id: string;
+  alt?: string;
+  className?: string;
+  priority?: boolean;
+  quality?: number;
+  sizes?: string;
+  isCompleted?: boolean;
+}
+
+export function Cover({
+  type,
+  id,
+  alt = "Image de couverture",
+  className,
+  priority = false,
+  quality = 80,
+  sizes = "(max-width: 640px) 33vw, (max-width: 1024px) 20vw, 20vw",
+  isCompleted = false,
+}: CoverProps) {
+  const [imageError, setImageError] = useState(false);
+  const [isLoading, setIsLoading] = useState(true);
+
+  const getImageUrl = () => {
+    if (type === "series") {
+      return `/api/komga/images/series/${id}/thumbnail`;
+    }
+    return `/api/komga/images/books/${id}/thumbnail`;
+  };
+
+  if (imageError) {
+    return (
+      <div className="w-full h-full flex items-center justify-center bg-muted rounded-lg">
+        <ImageOff className="w-12 h-12 text-muted-foreground" />
+      </div>
+    );
+  }
+
+  return (
+    <div className="relative w-full h-full">
+      <ImageLoader isLoading={isLoading} />
+      <Image
+        src={getImageUrl()}
+        alt={alt}
+        fill
+        className={cn(
+          "object-cover transition-opacity duration-300 rounded-lg",
+          isLoading ? "opacity-0" : "opacity-100",
+          isCompleted && "opacity-50",
+          className
+        )}
+        sizes={sizes}
+        onError={() => setImageError(true)}
+        onLoad={() => setIsLoading(false)}
+        loading={priority ? "eager" : "lazy"}
+        quality={quality}
+        priority={priority}
+      />
+    </div>
+  );
+}
diff --git a/src/lib/services/book.service.ts b/src/lib/services/book.service.ts
index 54dc358..12f7659 100644
--- a/src/lib/services/book.service.ts
+++ b/src/lib/services/book.service.ts
@@ -67,14 +67,6 @@ export class BookService extends BaseApiService {
 
   static async getPage(bookId: string, pageNumber: number): Promise<Response> {
     try {
-      // Récupérer les préférences de l'utilisateur
-      const preferences = await PreferencesService.getPreferences();
-
-      // Si l'utilisateur préfère les vignettes, utiliser getPageThumbnail
-      if (preferences.showThumbnails) {
-        return this.getPageThumbnail(bookId, pageNumber);
-      }
-
       // Ajuster le numéro de page pour l'API Komga (zero-based)
       const adjustedPageNumber = pageNumber - 1;
       const response = await ImageService.getImage(
@@ -83,6 +75,7 @@ export class BookService extends BaseApiService {
       return new Response(response.buffer, {
         headers: {
           "Content-Type": response.contentType || "image/jpeg",
+          "Cache-Control": "public, max-age=31536000, immutable",
         },
       });
     } catch (error) {
@@ -90,35 +83,26 @@ export class BookService extends BaseApiService {
     }
   }
 
-  static async getPageThumbnail(bookId: string, pageNumber: number): Promise<Response> {
+  static async getCover(bookId: string): Promise<Response> {
     try {
-      // Ajuster le numéro de page pour l'API Komga (zero-based)
-      const adjustedPageNumber = pageNumber;
-      const response = await ImageService.getImage(
-        `books/${bookId}/pages/${adjustedPageNumber}/thumbnail?zero_based=true`
-      );
-      return new Response(response.buffer, {
-        headers: {
-          "Content-Type": response.contentType || "image/jpeg",
-          "Cache-Control": "public, max-age=31536000, immutable",
-        },
-      });
-    } catch (error) {
-      throw this.handleError(error, "Impossible de récupérer la miniature");
-    }
-  }
+      // Récupérer les préférences de l'utilisateur
+      const preferences = await PreferencesService.getPreferences();
 
-  static async getThumbnail(bookId: string): Promise<Response> {
-    try {
-      const response = await ImageService.getImage(`books/${bookId}/thumbnail`);
-      return new Response(response.buffer, {
-        headers: {
-          "Content-Type": response.contentType || "image/jpeg",
-          "Cache-Control": "public, max-age=31536000, immutable",
-        },
-      });
+      // Si l'utilisateur préfère les vignettes, utiliser la miniature
+      if (preferences.showThumbnails) {
+        const response = await ImageService.getImage(`books/${bookId}/thumbnail`);
+        return new Response(response.buffer, {
+          headers: {
+            "Content-Type": response.contentType || "image/jpeg",
+            "Cache-Control": "public, max-age=31536000, immutable",
+          },
+        });
+      }
+
+      // Sinon, récupérer la première page
+      return this.getPage(bookId, 1);
     } catch (error) {
-      throw this.handleError(error, "Impossible de récupérer la miniature du livre");
+      throw this.handleError(error, "Impossible de récupérer la couverture");
     }
   }
 
@@ -130,7 +114,23 @@ export class BookService extends BaseApiService {
     return `/api/komga/images/books/${bookId}/pages/${pageNumber}/thumbnail`;
   }
 
-  static getThumbnailUrl(bookId: string): string {
-    return ImageService.getBookThumbnailUrl(bookId);
+  static async getPageThumbnail(bookId: string, pageNumber: number): Promise<Response> {
+    try {
+      const response = await ImageService.getImage(
+        `books/${bookId}/pages/${pageNumber}/thumbnail?zero_based=true`
+      );
+      return new Response(response.buffer, {
+        headers: {
+          "Content-Type": response.contentType || "image/jpeg",
+          "Cache-Control": "public, max-age=31536000, immutable",
+        },
+      });
+    } catch (error) {
+      throw this.handleError(error, "Impossible de récupérer la miniature de la page");
+    }
+  }
+
+  static getCoverUrl(bookId: string): string {
+    return `/api/komga/images/books/${bookId}/thumbnail`;
   }
 }
diff --git a/src/lib/services/series.service.ts b/src/lib/services/series.service.ts
index de67307..138b47f 100644
--- a/src/lib/services/series.service.ts
+++ b/src/lib/services/series.service.ts
@@ -77,14 +77,20 @@ export class SeriesService extends BaseApiService {
     }
   }
 
-  static async getFirstPage(seriesId: string): Promise<Response> {
+  static async getCover(seriesId: string): Promise<Response> {
     try {
       // Récupérer les préférences de l'utilisateur
       const preferences = await PreferencesService.getPreferences();
 
-      // Si l'utilisateur préfère les vignettes, utiliser getThumbnail
+      // Si l'utilisateur préfère les vignettes, utiliser la miniature
       if (preferences.showThumbnails) {
-        return this.getThumbnail(seriesId);
+        const response = await ImageService.getImage(`series/${seriesId}/thumbnail`);
+        return new Response(response.buffer, {
+          headers: {
+            "Content-Type": response.contentType || "image/jpeg",
+            "Cache-Control": "public, max-age=31536000, immutable",
+          },
+        });
       }
 
       // Sinon, récupérer la première page
@@ -92,21 +98,11 @@ export class SeriesService extends BaseApiService {
       const response = await BookService.getPage(firstBookId, 1);
       return response;
     } catch (error) {
-      throw this.handleError(error, "Impossible de récupérer la première page");
+      throw this.handleError(error, "Impossible de récupérer la couverture");
     }
   }
 
-  static async getThumbnail(seriesId: string): Promise<Response> {
-    try {
-      const response = await ImageService.getImage(`series/${seriesId}/thumbnail`);
-      return new Response(response.buffer, {
-        headers: {
-          "Content-Type": response.contentType || "image/jpeg",
-          "Cache-Control": "public, max-age=31536000, immutable",
-        },
-      });
-    } catch (error) {
-      throw this.handleError(error, "Impossible de récupérer la miniature de la série");
-    }
+  static getCoverUrl(seriesId: string): string {
+    return `/api/komga/images/series/${seriesId}/thumbnail`;
   }
 }