diff --git a/assets/vue/app/domain/manga/presentation/components/ManageChaptersModal.vue b/assets/vue/app/domain/manga/presentation/components/ManageChaptersModal.vue
index f5790ef..10ffdb5 100644
--- a/assets/vue/app/domain/manga/presentation/components/ManageChaptersModal.vue
+++ b/assets/vue/app/domain/manga/presentation/components/ManageChaptersModal.vue
@@ -1,177 +1,207 @@
 <template>
     <div v-if="isOpen" class="fixed inset-0 z-50 overflow-y-auto">
         <div class="flex items-center justify-center min-h-screen pt-4 px-4 pb-20 text-center sm:block sm:p-0">
-            <!-- Overlay -->
-            <div class="fixed inset-0 bg-gray-500 bg-opacity-75 transition-opacity" @click="handleClose"></div>
+            <!-- Overlay avec effet de flou Material Design -->
+            <div class="fixed inset-0 bg-black/40 backdrop-blur-sm transition-opacity" @click="handleClose"></div>
 
-            <!-- Modal -->
-            <div class="inline-block align-bottom bg-white rounded-lg text-left overflow-hidden shadow-xl transform transition-all sm:my-8 sm:align-middle sm:max-w-5xl sm:w-full">
-                <!-- Header -->
-                <div class="bg-white px-4 pt-5 pb-4 sm:p-6 sm:pb-4">
+            <!-- Modal avec style Material Design -->
+            <div class="inline-block align-bottom bg-white rounded-2xl text-left overflow-hidden shadow-2xl transform transition-all sm:my-8 sm:align-middle sm:max-w-5xl sm:w-full border border-gray-100">
+                <!-- Header Material Design -->
+                <div class="bg-gradient-to-r from-green-50 to-emerald-50 px-6 pt-6 pb-4 sm:px-8 sm:pb-6 border-b border-gray-100">
                     <div class="flex items-center justify-between">
-                        <h3 class="text-lg leading-6 font-medium text-gray-900">
-                            Gérer les chapitres - {{ manga?.title }}
-                        </h3>
+                        <div class="flex items-center space-x-3">
+                            <div class="w-10 h-10 bg-green-100 rounded-full flex items-center justify-center">
+                                <FolderIcon class="h-5 w-5 text-green-600" />
+                            </div>
+                            <div>
+                                <h3 class="text-xl font-medium text-gray-900 leading-6">
+                                    Gérer les chapitres
+                                </h3>
+                                <p class="text-sm text-gray-600 mt-1">{{ manga?.title }}</p>
+                            </div>
+                        </div>
                         <button
                             @click="handleClose"
-                            class="text-gray-400 hover:text-gray-600 transition-colors"
+                            class="w-8 h-8 rounded-full bg-gray-100 hover:bg-gray-200 flex items-center justify-center transition-colors duration-200"
                         >
-                            <XMarkIcon class="h-6 w-6" />
+                            <XMarkIcon class="h-5 w-5 text-gray-600" />
                         </button>
                     </div>
                 </div>
 
-                <!-- Content -->
-                <div class="bg-white px-4 pb-5 sm:p-6">
+                <!-- Content avec style Material Design -->
+                <div class="bg-white px-6 py-6 sm:px-8 sm:py-8">
                     <div v-if="isLoading" class="flex justify-center items-center h-32">
-                        <div class="animate-spin rounded-full h-8 w-8 border-b-2 border-primary"></div>
+                        <div class="relative">
+                            <div class="w-8 h-8 border-4 border-green-200 rounded-full"></div>
+                            <div class="absolute top-0 left-0 w-8 h-8 border-4 border-green-600 rounded-full border-t-transparent animate-spin"></div>
+                        </div>
                     </div>
 
-                    <div v-else-if="error" class="bg-red-100 border border-red-400 text-red-700 px-4 py-3 rounded mb-4">
-                        {{ error }}
+                    <div v-else-if="error" class="bg-red-50 border border-red-200 text-red-700 px-4 py-3 rounded-xl mb-6 flex items-center space-x-2">
+                        <div class="w-5 h-5 bg-red-100 rounded-full flex items-center justify-center">
+                            <XMarkIcon class="h-3 w-3 text-red-600" />
+                        </div>
+                        <span>{{ error }}</span>
                     </div>
 
                     <div v-else class="space-y-6">
-                        <!-- Actions -->
-                        <div class="flex items-center justify-between">
+                        <!-- Actions avec style Material Design -->
+                        <div class="flex items-center justify-between bg-gray-50 rounded-xl p-4">
                             <div class="flex items-center space-x-3">
                                 <button
                                     @click="showCreateVolumeModal = true"
-                                    class="bg-blue-600 text-white px-4 py-2 rounded text-sm hover:bg-blue-700"
+                                    class="bg-green-600 text-white px-4 py-2.5 rounded-lg text-sm font-medium hover:bg-green-700 shadow-md hover:shadow-lg transition-all duration-200 flex items-center space-x-2"
                                 >
-                                    <PlusIcon class="h-4 w-4 inline mr-1" />
-                                    Créer un volume
+                                    <PlusIcon class="h-4 w-4" />
+                                    <span>Créer un volume</span>
                                 </button>
                                 <button
                                     @click="showUnassignedChapters = !showUnassignedChapters"
-                                    class="text-gray-600 hover:text-gray-800 text-sm"
+                                    class="text-gray-600 hover:text-gray-800 text-sm font-medium hover:bg-gray-100 px-3 py-2 rounded-lg transition-colors duration-200"
                                 >
                                     {{ showUnassignedChapters ? 'Masquer' : 'Afficher' }} les chapitres non assignés
                                 </button>
+                                <!-- Bouton de séparation automatique du volume fourre-tout -->
+                                <button
+                                    v-if="hasVolumeZero && canSplitVolumeZero"
+                                    @click="showSplitVolumeZeroModal = true"
+                                    class="bg-green-600 text-white px-4 py-2.5 rounded-lg text-sm font-medium hover:bg-green-700 shadow-md hover:shadow-lg transition-all duration-200 flex items-center space-x-2"
+                                >
+                                    <ArrowPathIcon class="h-4 w-4" />
+                                    <span>Séparer le volume 00</span>
+                                </button>
                                 <!-- Actions de sélection multiple -->
-                                <div v-if="selectedChapters.length > 0" class="flex items-center space-x-2 bg-blue-50 px-3 py-1 rounded-lg">
-                                    <span class="text-sm text-blue-700">{{ selectedChapters.length }} chapitre(s) sélectionné(s)</span>
+                                <div v-if="selectedChapters.length > 0" class="flex items-center space-x-3 bg-green-50 px-4 py-2 rounded-xl border border-green-200">
+                                    <span class="text-sm font-medium text-green-700">{{ selectedChapters.length }} chapitre(s) sélectionné(s)</span>
                                     <button
                                         @click="showMoveToVolumeModal = true"
-                                        class="bg-blue-600 text-white px-2 py-1 rounded text-xs hover:bg-blue-700"
+                                        class="bg-green-600 text-white px-3 py-1.5 rounded-lg text-xs font-medium hover:bg-green-700 shadow-sm transition-colors duration-200"
                                     >
                                         Déplacer vers un volume
                                     </button>
                                     <button
                                         @click="clearSelection"
-                                        class="text-blue-600 hover:text-blue-800 text-xs"
+                                        class="text-green-600 hover:text-green-800 text-xs font-medium hover:bg-green-100 px-2 py-1 rounded transition-colors duration-200"
                                     >
                                         Annuler
                                     </button>
                                 </div>
                             </div>
-                            <div class="text-sm text-gray-500">
+                            <div class="text-sm text-gray-500 bg-white px-3 py-1.5 rounded-lg border border-gray-200">
                                 {{ totalChapters }} chapitres, {{ volumes.length }} volumes
                             </div>
                         </div>
 
-                        <!-- Arborescence -->
-                        <div class="border border-gray-200 rounded-lg overflow-hidden">
+                        <!-- Arborescence avec style Material Design -->
+                        <div class="bg-white border border-gray-200 rounded-xl overflow-hidden shadow-sm">
                             <!-- Chapitres non assignés -->
-                            <div v-if="showUnassignedChapters && unassignedChapters.length > 0" class="bg-gray-50 border-b border-gray-200">
-                                <div class="px-4 py-3">
-                                    <h4 class="text-sm font-medium text-gray-700 mb-2">
-                                        Chapitres non assignés ({{ unassignedChapters.length }})
+                            <div v-if="showUnassignedChapters && unassignedChapters.length > 0" class="bg-gradient-to-r from-gray-50 to-gray-100 border-b border-gray-200">
+                                <div class="px-6 py-4">
+                                    <h4 class="text-sm font-semibold text-gray-700 mb-3 flex items-center space-x-2">
+                                        <DocumentIcon class="h-4 w-4 text-gray-500" />
+                                        <span>Chapitres non assignés ({{ unassignedChapters.length }})</span>
                                     </h4>
-                                    <div class="space-y-1">
+                                    <div class="space-y-2">
                                         <div
                                             v-for="chapter in unassignedChapters"
                                             :key="chapter.id"
-                                            class="flex items-center space-x-3 p-2 hover:bg-gray-100 rounded"
-                                            :class="{ 'bg-blue-50 border border-blue-200': isChapterSelected(chapter) }"
+                                            class="flex items-center space-x-3 p-3 hover:bg-white rounded-lg transition-colors duration-200 border border-transparent hover:border-gray-200"
+                                            :class="{ 'bg-green-50 border-green-200 shadow-sm': isChapterSelected(chapter) }"
                                         >
-                                            <!-- Checkbox de sélection -->
-                                            <input
-                                                type="checkbox"
-                                                :checked="isChapterSelected(chapter)"
-                                                @change="toggleChapterSelection(chapter)"
-                                                class="h-4 w-4 text-blue-600 border-gray-300 rounded focus:ring-blue-500"
-                                            />
-                                            <DocumentIcon class="h-4 w-4 text-gray-400" />
-                                            <span class="text-sm font-medium text-gray-700 w-12">{{ chapter.number }}</span>
+                                            <!-- Checkbox de sélection Material Design -->
+                                            <div class="relative">
+                                                <input
+                                                    type="checkbox"
+                                                    :checked="isChapterSelected(chapter)"
+                                                    @change="toggleChapterSelection(chapter)"
+                                                    class="h-5 w-5 text-green-600 border-gray-300 rounded focus:ring-green-500 focus:ring-2 transition-colors duration-200"
+                                                />
+                                            </div>
+                                            <DocumentIcon class="h-5 w-5 text-gray-400" />
+                                            <span class="text-sm font-medium text-gray-700 w-12 bg-gray-100 px-2 py-1 rounded text-center">{{ chapter.number }}</span>
                                             <div class="flex-1">
                                                 <div v-if="!chapter.isEditing" class="flex items-center">
                                                     <span
-                                                        class="text-sm text-gray-900 cursor-pointer hover:text-blue-600"
+                                                        class="text-sm text-gray-900 cursor-pointer hover:text-green-600 transition-colors duration-200"
                                                         @click="startEditingTitle(chapter)"
                                                     >
                                                         {{ chapter.title || 'Sans titre' }}
                                                     </span>
                                                     <button
                                                         @click="startEditingTitle(chapter)"
-                                                        class="ml-2 text-gray-400 hover:text-gray-600"
+                                                        class="ml-2 text-gray-400 hover:text-gray-600 p-1 rounded-full hover:bg-gray-100 transition-colors duration-200"
                                                     >
                                                         <PencilIcon class="h-3 w-3" />
                                                     </button>
                                                 </div>
-                                                <div v-else class="flex items-center space-x-1">
+                                                <div v-else class="flex items-center space-x-2">
                                                     <input
                                                         v-model="chapter.editingTitle"
                                                         type="text"
-                                                        class="flex-1 border border-gray-300 rounded px-2 py-1 text-xs"
+                                                        class="flex-1 border border-gray-300 rounded-lg px-3 py-1.5 text-sm focus:ring-2 focus:ring-green-500 focus:border-green-500 transition-colors duration-200"
                                                         @keyup.enter="saveTitle(chapter)"
                                                         @keyup.esc="cancelEditingTitle(chapter)"
                                                         ref="titleInput"
                                                     />
                                                     <button
                                                         @click="saveTitle(chapter)"
-                                                        class="text-green-600 hover:text-green-800"
+                                                        class="text-green-600 hover:text-green-800 p-1 rounded-full hover:bg-green-100 transition-colors duration-200"
                                                     >
-                                                        <CheckIcon class="h-3 w-3" />
+                                                        <CheckIcon class="h-4 w-4" />
                                                     </button>
                                                     <button
                                                         @click="cancelEditingTitle(chapter)"
-                                                        class="text-red-600 hover:text-red-800"
+                                                        class="text-red-600 hover:text-red-800 p-1 rounded-full hover:bg-red-100 transition-colors duration-200"
                                                     >
-                                                        <XMarkIcon class="h-3 w-3" />
+                                                        <XMarkIcon class="h-4 w-4" />
                                                     </button>
                                                 </div>
                                             </div>
-                                            <div class="flex items-center space-x-1">
+                                            <div class="flex items-center space-x-2">
                                                 <button
                                                     @click="assignToVolume(chapter)"
-                                                    class="text-blue-600 hover:text-blue-800 text-xs"
+                                                    class="bg-green-600 text-white px-3 py-1.5 rounded-lg text-xs font-medium hover:bg-green-700 shadow-sm transition-colors duration-200"
                                                 >
                                                     Assigner
                                                 </button>
                                             </div>
-                                            <div v-if="chapter.isModified" class="w-2 h-2 bg-yellow-400 rounded-full"></div>
+                                            <div v-if="chapter.isModified" class="w-3 h-3 bg-yellow-400 rounded-full shadow-sm"></div>
                                         </div>
                                     </div>
                                 </div>
                             </div>
 
-                            <!-- Volumes -->
-                            <div class="divide-y divide-gray-200">
+                            <!-- Volumes avec style Material Design -->
+                            <div class="divide-y divide-gray-100">
                                 <div
                                     v-for="volume in volumes"
                                     :key="volume.number"
                                     class="bg-white"
                                 >
-                                    <!-- En-tête du volume -->
-                                    <div class="px-4 py-3 bg-blue-50 border-b border-blue-100">
+                                    <!-- En-tête du volume Material Design -->
+                                    <div class="px-6 py-4 bg-gradient-to-r from-green-50 to-emerald-50 border-b border-green-100">
                                         <div class="flex items-center justify-between">
-                                            <div class="flex items-center space-x-2">
-                                                <FolderIcon class="h-5 w-5 text-blue-600" />
-                                                <span class="text-sm font-medium text-blue-900">Volume {{ volume.number }}</span>
-                                                <span class="text-xs text-blue-600">({{ volume.chapters.length }} chapitres)</span>
+                                            <div class="flex items-center space-x-3">
+                                                <div class="w-8 h-8 bg-green-100 rounded-full flex items-center justify-center">
+                                                    <FolderIcon class="h-4 w-4 text-green-600" />
+                                                </div>
+                                                <div>
+                                                    <span class="text-sm font-semibold text-green-900">Volume {{ volume.number }}</span>
+                                                    <span class="text-xs text-green-600 ml-2">({{ volume.chapters.length }} chapitres)</span>
+                                                </div>
                                             </div>
                                             <div class="flex items-center space-x-2">
                                                 <button
                                                     @click="toggleVolumeExpanded(volume)"
-                                                    class="text-blue-600 hover:text-blue-800"
+                                                    class="w-8 h-8 rounded-full bg-green-100 hover:bg-green-200 flex items-center justify-center transition-colors duration-200"
                                                 >
-                                                    <ChevronDownIcon v-if="volume.isExpanded" class="h-4 w-4" />
-                                                    <ChevronRightIcon v-else class="h-4 w-4" />
+                                                    <ChevronDownIcon v-if="volume.isExpanded" class="h-4 w-4 text-green-600" />
+                                                    <ChevronRightIcon v-else class="h-4 w-4 text-green-600" />
                                                 </button>
                                                 <button
                                                     @click="deleteVolume(volume.number)"
-                                                    class="text-red-600 hover:text-red-800 text-sm"
+                                                    class="text-red-600 hover:text-red-800 text-sm font-medium hover:bg-red-100 px-3 py-1.5 rounded-lg transition-colors duration-200"
                                                 >
                                                     Supprimer
                                                 </button>
@@ -180,75 +210,77 @@
                                     </div>
 
                                     <!-- Chapitres du volume -->
-                                    <div v-if="volume.isExpanded" class="px-4 py-2">
-                                        <div v-if="volume.chapters.length === 0" class="text-center py-4 text-gray-500 text-sm">
-                                            Aucun chapitre assigné à ce volume.
-                                            <br>
-                                            <span class="text-xs">Utilisez le bouton "Assigner" sur les chapitres non assignés pour les ajouter.</span>
+                                    <div v-if="volume.isExpanded" class="px-6 py-4">
+                                        <div v-if="volume.chapters.length === 0" class="text-center py-8 text-gray-500">
+                                            <DocumentIcon class="h-12 w-12 text-gray-300 mx-auto mb-3" />
+                                            <p class="text-sm">Aucun chapitre assigné à ce volume.</p>
+                                            <p class="text-xs text-gray-400 mt-1">Utilisez le bouton "Assigner" sur les chapitres non assignés pour les ajouter.</p>
                                         </div>
-                                        <div v-else class="space-y-1">
+                                        <div v-else class="space-y-2">
                                             <div
                                                 v-for="chapter in volume.chapters"
                                                 :key="chapter.id"
-                                                class="flex items-center space-x-3 p-2 hover:bg-gray-50 rounded"
-                                                :class="{ 'bg-blue-50 border border-blue-200': isChapterSelected(chapter) }"
+                                                class="flex items-center space-x-3 p-3 hover:bg-gray-50 rounded-lg transition-colors duration-200 border border-transparent hover:border-gray-200"
+                                                :class="{ 'bg-green-50 border-green-200 shadow-sm': isChapterSelected(chapter) }"
                                             >
                                                 <!-- Checkbox de sélection -->
-                                                <input
-                                                    type="checkbox"
-                                                    :checked="isChapterSelected(chapter)"
-                                                    @change="toggleChapterSelection(chapter)"
-                                                    class="h-4 w-4 text-blue-600 border-gray-300 rounded focus:ring-blue-500"
-                                                />
-                                                <DocumentIcon class="h-4 w-4 text-gray-400" />
-                                                <span class="text-sm font-medium text-gray-700 w-12">{{ chapter.number }}</span>
+                                                <div class="relative">
+                                                    <input
+                                                        type="checkbox"
+                                                        :checked="isChapterSelected(chapter)"
+                                                        @change="toggleChapterSelection(chapter)"
+                                                        class="h-5 w-5 text-green-600 border-gray-300 rounded focus:ring-green-500 focus:ring-2 transition-colors duration-200"
+                                                    />
+                                                </div>
+                                                <DocumentIcon class="h-5 w-5 text-gray-400" />
+                                                <span class="text-sm font-medium text-gray-700 w-12 bg-gray-100 px-2 py-1 rounded text-center">{{ chapter.number }}</span>
                                                 <div class="flex-1">
                                                     <div v-if="!chapter.isEditing" class="flex items-center">
                                                         <span
-                                                            class="text-sm text-gray-900 cursor-pointer hover:text-blue-600"
+                                                            class="text-sm text-gray-900 cursor-pointer hover:text-green-600 transition-colors duration-200"
                                                             @click="startEditingTitle(chapter)"
                                                         >
                                                             {{ chapter.title || 'Sans titre' }}
                                                         </span>
                                                         <button
                                                             @click="startEditingTitle(chapter)"
-                                                            class="ml-2 text-gray-400 hover:text-gray-600"
+                                                            class="ml-2 text-gray-400 hover:text-gray-600 p-1 rounded-full hover:bg-gray-100 transition-colors duration-200"
                                                         >
                                                             <PencilIcon class="h-3 w-3" />
                                                         </button>
                                                     </div>
-                                                    <div v-else class="flex items-center space-x-1">
+                                                    <div v-else class="flex items-center space-x-2">
                                                         <input
                                                             v-model="chapter.editingTitle"
                                                             type="text"
-                                                            class="flex-1 border border-gray-300 rounded px-2 py-1 text-xs"
+                                                            class="flex-1 border border-gray-300 rounded-lg px-3 py-1.5 text-sm focus:ring-2 focus:ring-green-500 focus:border-green-500 transition-colors duration-200"
                                                             @keyup.enter="saveTitle(chapter)"
                                                             @keyup.esc="cancelEditingTitle(chapter)"
                                                             ref="titleInput"
                                                         />
                                                         <button
                                                             @click="saveTitle(chapter)"
-                                                            class="text-green-600 hover:text-green-800"
+                                                            class="text-green-600 hover:text-green-800 p-1 rounded-full hover:bg-green-100 transition-colors duration-200"
                                                         >
-                                                            <CheckIcon class="h-3 w-3" />
+                                                            <CheckIcon class="h-4 w-4" />
                                                         </button>
                                                         <button
                                                             @click="cancelEditingTitle(chapter)"
-                                                            class="text-red-600 hover:text-red-800"
+                                                            class="text-red-600 hover:text-red-800 p-1 rounded-full hover:bg-red-100 transition-colors duration-200"
                                                         >
-                                                            <XMarkIcon class="h-3 w-3" />
+                                                            <XMarkIcon class="h-4 w-4" />
                                                         </button>
                                                     </div>
                                                 </div>
-                                                <div class="flex items-center space-x-1">
+                                                <div class="flex items-center space-x-2">
                                                     <button
                                                         @click="removeFromVolume(chapter)"
-                                                        class="text-red-600 hover:text-red-800 text-xs"
+                                                        class="text-red-600 hover:text-red-800 text-xs font-medium hover:bg-red-100 px-3 py-1.5 rounded-lg transition-colors duration-200"
                                                     >
                                                         Retirer
                                                     </button>
                                                 </div>
-                                                <div v-if="chapter.isModified" class="w-2 h-2 bg-yellow-400 rounded-full"></div>
+                                                <div v-if="chapter.isModified" class="w-3 h-3 bg-yellow-400 rounded-full shadow-sm"></div>
                                             </div>
                                         </div>
                                     </div>
@@ -258,85 +290,108 @@
                     </div>
                 </div>
 
-                <!-- Footer -->
-                <div class="bg-gray-50 px-4 py-3 sm:px-6 sm:flex sm:flex-row-reverse">
-                    <button
-                        @click="handleSave"
-                        :disabled="isSaving || !hasChanges"
-                        class="w-full inline-flex justify-center rounded-md border border-transparent shadow-sm px-4 py-2 bg-blue-600 text-base font-medium text-white hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500 sm:ml-3 sm:w-auto sm:text-sm disabled:opacity-50"
-                    >
-                        <span v-if="isSaving">Sauvegarde...</span>
-                        <span v-else>Sauvegarder</span>
-                    </button>
-                    <button
-                        @click="handleClose"
-                        :disabled="isSaving"
-                        class="mt-3 w-full inline-flex justify-center rounded-md border border-gray-300 shadow-sm px-4 py-2 bg-white text-base font-medium text-gray-700 hover:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500 sm:mt-0 sm:ml-3 sm:w-auto sm:text-sm disabled:opacity-50"
-                    >
-                        Annuler
-                    </button>
+                <!-- Footer Material Design -->
+                <div class="bg-gray-50 px-6 py-4 sm:px-8 sm:py-6 border-t border-gray-200">
+                    <div class="flex flex-col sm:flex-row sm:justify-end sm:space-x-3 space-y-3 sm:space-y-0">
+                        <button
+                            @click="handleClose"
+                            :disabled="isSaving"
+                            class="w-full sm:w-auto inline-flex justify-center items-center rounded-lg border border-gray-300 bg-white px-6 py-2.5 text-sm font-medium text-gray-700 hover:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-green-500 disabled:opacity-50 transition-all duration-200 shadow-sm hover:shadow-md"
+                        >
+                            Annuler
+                        </button>
+                        <button
+                            @click="handleSave"
+                            :disabled="isSaving || !hasChanges"
+                            class="w-full sm:w-auto inline-flex justify-center items-center rounded-lg border border-transparent bg-green-600 px-6 py-2.5 text-sm font-medium text-white hover:bg-green-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-green-500 disabled:opacity-50 transition-all duration-200 shadow-md hover:shadow-lg"
+                        >
+                            <span v-if="isSaving" class="flex items-center space-x-2">
+                                <div class="w-4 h-4 border-2 border-white border-t-transparent rounded-full animate-spin"></div>
+                                <span>Sauvegarde...</span>
+                            </span>
+                            <span v-else>Sauvegarder</span>
+                        </button>
+                    </div>
                 </div>
             </div>
         </div>
 
-        <!-- Modal de création de volume -->
+        <!-- Modal de création de volume Material Design -->
         <div v-if="showCreateVolumeModal" class="fixed inset-0 z-60 overflow-y-auto">
             <div class="flex items-center justify-center min-h-screen pt-4 px-4 pb-20 text-center sm:block sm:p-0">
-                <div class="fixed inset-0 bg-gray-500 bg-opacity-75 transition-opacity" @click="showCreateVolumeModal = false"></div>
-                <div class="inline-block align-bottom bg-white rounded-lg text-left overflow-hidden shadow-xl transform transition-all sm:my-8 sm:align-middle sm:max-w-sm sm:w-full">
-                    <div class="bg-white px-4 pt-5 pb-4 sm:p-6 sm:pb-4">
-                        <h3 class="text-lg leading-6 font-medium text-gray-900 mb-4">Créer un nouveau volume</h3>
+                <div class="fixed inset-0 bg-black/40 backdrop-blur-sm transition-opacity" @click="showCreateVolumeModal = false"></div>
+                <div class="inline-block align-bottom bg-white rounded-2xl text-left overflow-hidden shadow-2xl transform transition-all sm:my-8 sm:align-middle sm:max-w-sm sm:w-full border border-gray-100">
+                    <div class="bg-gradient-to-r from-green-50 to-emerald-50 px-6 pt-6 pb-4 sm:px-8 sm:pb-6 border-b border-gray-100">
+                        <div class="flex items-center space-x-3">
+                            <div class="w-10 h-10 bg-green-100 rounded-full flex items-center justify-center">
+                                <PlusIcon class="h-5 w-5 text-green-600" />
+                            </div>
+                            <h3 class="text-lg font-medium text-gray-900">Créer un nouveau volume</h3>
+                        </div>
+                    </div>
+                    <div class="bg-white px-6 py-6 sm:px-8 sm:py-6">
                         <div class="space-y-4">
                             <div>
-                                <label class="block text-sm font-medium text-gray-700">Numéro du volume</label>
+                                <label class="block text-sm font-medium text-gray-700 mb-2">Numéro du volume</label>
                                 <input
                                     v-model="newVolumeNumber"
                                     type="number"
                                     min="1"
-                                    class="mt-1 block w-full border border-gray-300 rounded-md px-3 py-2 text-sm"
+                                    class="block w-full border border-gray-300 rounded-lg px-4 py-3 text-sm focus:ring-2 focus:ring-green-500 focus:border-green-500 transition-colors duration-200"
                                     placeholder="Ex: 1"
                                 />
                             </div>
-                            <div v-if="volumeExists" class="text-red-600 text-sm">
-                                Ce volume existe déjà.
+                            <div v-if="volumeExists" class="bg-red-50 border border-red-200 text-red-700 px-4 py-3 rounded-lg flex items-center space-x-2">
+                                <XMarkIcon class="h-4 w-4 text-red-600" />
+                                <span class="text-sm">Ce volume existe déjà.</span>
                             </div>
-                            <div v-if="newVolumeNumber && !isValidVolumeNumber" class="text-red-600 text-sm">
-                                Le numéro de volume doit être entre 1 et 999.
+                            <div v-if="newVolumeNumber && !isValidVolumeNumber" class="bg-red-50 border border-red-200 text-red-700 px-4 py-3 rounded-lg flex items-center space-x-2">
+                                <XMarkIcon class="h-4 w-4 text-red-600" />
+                                <span class="text-sm">Le numéro de volume doit être entre 1 et 999.</span>
                             </div>
                         </div>
                     </div>
-                    <div class="bg-gray-50 px-4 py-3 sm:px-6 sm:flex sm:flex-row-reverse">
-                        <button
-                            @click="createVolume"
-                            :disabled="!isValidVolumeNumber || volumeExists"
-                            class="w-full inline-flex justify-center rounded-md border border-transparent shadow-sm px-4 py-2 bg-blue-600 text-base font-medium text-white hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500 sm:ml-3 sm:w-auto sm:text-sm disabled:opacity-50"
-                        >
-                            Créer
-                        </button>
-                        <button
-                            @click="showCreateVolumeModal = false"
-                            class="mt-3 w-full inline-flex justify-center rounded-md border border-gray-300 shadow-sm px-4 py-2 bg-white text-base font-medium text-gray-700 hover:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500 sm:mt-0 sm:ml-3 sm:w-auto sm:text-sm"
-                        >
-                            Annuler
-                        </button>
+                    <div class="bg-gray-50 px-6 py-4 sm:px-8 sm:py-6 border-t border-gray-200">
+                        <div class="flex flex-col sm:flex-row sm:justify-end sm:space-x-3 space-y-3 sm:space-y-0">
+                            <button
+                                @click="showCreateVolumeModal = false"
+                                class="w-full sm:w-auto inline-flex justify-center items-center rounded-lg border border-gray-300 bg-white px-6 py-2.5 text-sm font-medium text-gray-700 hover:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-green-500 transition-all duration-200 shadow-sm hover:shadow-md"
+                            >
+                                Annuler
+                            </button>
+                            <button
+                                @click="createVolume"
+                                :disabled="!isValidVolumeNumber || volumeExists"
+                                class="w-full sm:w-auto inline-flex justify-center items-center rounded-lg border border-transparent bg-green-600 px-6 py-2.5 text-sm font-medium text-white hover:bg-green-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-green-500 disabled:opacity-50 transition-all duration-200 shadow-md hover:shadow-lg"
+                            >
+                                Créer
+                            </button>
+                        </div>
                     </div>
                 </div>
             </div>
         </div>
 
-        <!-- Modal d'assignation -->
+        <!-- Modal d'assignation Material Design -->
         <div v-if="showAssignModal" class="fixed inset-0 z-60 overflow-y-auto">
             <div class="flex items-center justify-center min-h-screen pt-4 px-4 pb-20 text-center sm:block sm:p-0">
-                <div class="fixed inset-0 bg-gray-500 bg-opacity-75 transition-opacity" @click="showAssignModal = false"></div>
-                <div class="inline-block align-bottom bg-white rounded-lg text-left overflow-hidden shadow-xl transform transition-all sm:my-8 sm:align-middle sm:max-w-sm sm:w-full">
-                    <div class="bg-white px-4 pt-5 pb-4 sm:p-6 sm:pb-4">
-                        <h3 class="text-lg leading-6 font-medium text-gray-900 mb-4">Assigner le chapitre {{ selectedChapter?.number }}</h3>
+                <div class="fixed inset-0 bg-black/40 backdrop-blur-sm transition-opacity" @click="showAssignModal = false"></div>
+                <div class="inline-block align-bottom bg-white rounded-2xl text-left overflow-hidden shadow-2xl transform transition-all sm:my-8 sm:align-middle sm:max-w-sm sm:w-full border border-gray-100">
+                    <div class="bg-gradient-to-r from-green-50 to-emerald-50 px-6 pt-6 pb-4 sm:px-8 sm:pb-6 border-b border-gray-100">
+                        <div class="flex items-center space-x-3">
+                            <div class="w-10 h-10 bg-green-100 rounded-full flex items-center justify-center">
+                                <DocumentIcon class="h-5 w-5 text-green-600" />
+                            </div>
+                            <h3 class="text-lg font-medium text-gray-900">Assigner le chapitre {{ selectedChapter?.number }}</h3>
+                        </div>
+                    </div>
+                    <div class="bg-white px-6 py-6 sm:px-8 sm:py-6">
                         <div class="space-y-4">
                             <div>
-                                <label class="block text-sm font-medium text-gray-700">Volume</label>
+                                <label class="block text-sm font-medium text-gray-700 mb-2">Volume</label>
                                 <select
                                     v-model="selectedVolumeForAssignment"
-                                    class="mt-1 block w-full border border-gray-300 rounded-md px-3 py-2 text-sm"
+                                    class="block w-full border border-gray-300 rounded-lg px-4 py-3 text-sm focus:ring-2 focus:ring-green-500 focus:border-green-500 transition-colors duration-200"
                                 >
                                     <option value="">Sélectionner un volume</option>
                                     <option v-for="volume in volumes" :key="volume.number" :value="volume.number">
@@ -346,43 +401,52 @@
                             </div>
                         </div>
                     </div>
-                    <div class="bg-gray-50 px-4 py-3 sm:px-6 sm:flex sm:flex-row-reverse">
-                        <button
-                            @click="confirmAssignToVolume"
-                            :disabled="!selectedVolumeForAssignment"
-                            class="w-full inline-flex justify-center rounded-md border border-transparent shadow-sm px-4 py-2 bg-blue-600 text-base font-medium text-white hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500 sm:ml-3 sm:w-auto sm:text-sm disabled:opacity-50"
-                        >
-                            Assigner
-                        </button>
-                        <button
-                            @click="showAssignModal = false"
-                            class="mt-3 w-full inline-flex justify-center rounded-md border border-gray-300 shadow-sm px-4 py-2 bg-white text-base font-medium text-gray-700 hover:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500 sm:mt-0 sm:ml-3 sm:w-auto sm:text-sm"
-                        >
-                            Annuler
-                        </button>
+                    <div class="bg-gray-50 px-6 py-4 sm:px-8 sm:py-6 border-t border-gray-200">
+                        <div class="flex flex-col sm:flex-row sm:justify-end sm:space-x-3 space-y-3 sm:space-y-0">
+                            <button
+                                @click="showAssignModal = false"
+                                class="w-full sm:w-auto inline-flex justify-center items-center rounded-lg border border-gray-300 bg-white px-6 py-2.5 text-sm font-medium text-gray-700 hover:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-green-500 transition-all duration-200 shadow-sm hover:shadow-md"
+                            >
+                                Annuler
+                            </button>
+                            <button
+                                @click="confirmAssignToVolume"
+                                :disabled="!selectedVolumeForAssignment"
+                                class="w-full sm:w-auto inline-flex justify-center items-center rounded-lg border border-transparent bg-green-600 px-6 py-2.5 text-sm font-medium text-white hover:bg-green-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-green-500 disabled:opacity-50 transition-all duration-200 shadow-md hover:shadow-lg"
+                            >
+                                Assigner
+                            </button>
+                        </div>
                     </div>
                 </div>
             </div>
         </div>
 
-        <!-- Modal de déplacement multiple -->
+        <!-- Modal de déplacement multiple Material Design -->
         <div v-if="showMoveToVolumeModal" class="fixed inset-0 z-60 overflow-y-auto">
             <div class="flex items-center justify-center min-h-screen pt-4 px-4 pb-20 text-center sm:block sm:p-0">
-                <div class="fixed inset-0 bg-gray-500 bg-opacity-75 transition-opacity" @click="showMoveToVolumeModal = false"></div>
-                <div class="inline-block align-bottom bg-white rounded-lg text-left overflow-hidden shadow-xl transform transition-all sm:my-8 sm:align-middle sm:max-w-sm sm:w-full">
-                    <div class="bg-white px-4 pt-5 pb-4 sm:p-6 sm:pb-4">
-                        <h3 class="text-lg leading-6 font-medium text-gray-900 mb-4">Déplacer {{ selectedChapters.length }} chapitre(s)</h3>
+                <div class="fixed inset-0 bg-black/40 backdrop-blur-sm transition-opacity" @click="showMoveToVolumeModal = false"></div>
+                <div class="inline-block align-bottom bg-white rounded-2xl text-left overflow-hidden shadow-2xl transform transition-all sm:my-8 sm:align-middle sm:max-w-sm sm:w-full border border-gray-100">
+                    <div class="bg-gradient-to-r from-green-50 to-emerald-50 px-6 pt-6 pb-4 sm:px-8 sm:pb-6 border-b border-gray-100">
+                        <div class="flex items-center space-x-3">
+                            <div class="w-10 h-10 bg-green-100 rounded-full flex items-center justify-center">
+                                <ArrowPathIcon class="h-5 w-5 text-green-600" />
+                            </div>
+                            <h3 class="text-lg font-medium text-gray-900">Déplacer {{ selectedChapters.length }} chapitre(s)</h3>
+                        </div>
+                    </div>
+                    <div class="bg-white px-6 py-6 sm:px-8 sm:py-6">
                         <div class="space-y-4">
-                            <div class="bg-blue-50 p-3 rounded-lg">
-                                <p class="text-sm text-blue-800">
+                            <div class="bg-green-50 p-4 rounded-lg border border-green-200">
+                                <p class="text-sm text-green-800 font-medium">
                                     Chapitres sélectionnés : {{ selectedChapters.map(c => c.number).join(', ') }}
                                 </p>
                             </div>
                             <div>
-                                <label class="block text-sm font-medium text-gray-700">Volume de destination</label>
+                                <label class="block text-sm font-medium text-gray-700 mb-2">Volume de destination</label>
                                 <select
                                     v-model="selectedVolumeForMove"
-                                    class="mt-1 block w-full border border-gray-300 rounded-md px-3 py-2 text-sm"
+                                    class="block w-full border border-gray-300 rounded-lg px-4 py-3 text-sm focus:ring-2 focus:ring-green-500 focus:border-green-500 transition-colors duration-200"
                                 >
                                     <option value="">Sélectionner un volume</option>
                                     <option v-for="volume in volumes" :key="volume.number" :value="volume.number">
@@ -393,20 +457,81 @@
                             </div>
                         </div>
                     </div>
-                    <div class="bg-gray-50 px-4 py-3 sm:px-6 sm:flex sm:flex-row-reverse">
-                        <button
-                            @click="confirmMoveToVolume"
-                            :disabled="!selectedVolumeForMove"
-                            class="w-full inline-flex justify-center rounded-md border border-transparent shadow-sm px-4 py-2 bg-blue-600 text-base font-medium text-white hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500 sm:ml-3 sm:w-auto sm:text-sm disabled:opacity-50"
-                        >
-                            Déplacer
-                        </button>
-                        <button
-                            @click="showMoveToVolumeModal = false"
-                            class="mt-3 w-full inline-flex justify-center rounded-md border border-gray-300 shadow-sm px-4 py-2 bg-white text-base font-medium text-gray-700 hover:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500 sm:mt-0 sm:ml-3 sm:w-auto sm:text-sm"
-                        >
-                            Annuler
-                        </button>
+                    <div class="bg-gray-50 px-6 py-4 sm:px-8 sm:py-6 border-t border-gray-200">
+                        <div class="flex flex-col sm:flex-row sm:justify-end sm:space-x-3 space-y-3 sm:space-y-0">
+                            <button
+                                @click="showMoveToVolumeModal = false"
+                                class="w-full sm:w-auto inline-flex justify-center items-center rounded-lg border border-gray-300 bg-white px-6 py-2.5 text-sm font-medium text-gray-700 hover:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-green-500 transition-all duration-200 shadow-sm hover:shadow-md"
+                            >
+                                Annuler
+                            </button>
+                            <button
+                                @click="confirmMoveToVolume"
+                                :disabled="!selectedVolumeForMove"
+                                class="w-full sm:w-auto inline-flex justify-center items-center rounded-lg border border-transparent bg-green-600 px-6 py-2.5 text-sm font-medium text-white hover:bg-green-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-green-500 disabled:opacity-50 transition-all duration-200 shadow-md hover:shadow-lg"
+                            >
+                                Déplacer
+                            </button>
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </div>
+
+        <!-- Modal de séparation du volume fourre-tout Material Design -->
+        <div v-if="showSplitVolumeZeroModal" class="fixed inset-0 z-60 overflow-y-auto">
+            <div class="flex items-center justify-center min-h-screen pt-4 px-4 pb-20 text-center sm:block sm:p-0">
+                <div class="fixed inset-0 bg-black/40 backdrop-blur-sm transition-opacity" @click="showSplitVolumeZeroModal = false"></div>
+                <div class="inline-block align-bottom bg-white rounded-2xl text-left overflow-hidden shadow-2xl transform transition-all sm:my-8 sm:align-middle sm:max-w-lg sm:w-full border border-gray-100">
+                    <div class="bg-gradient-to-r from-green-50 to-emerald-50 px-6 pt-6 pb-4 sm:px-8 sm:pb-6 border-b border-gray-100">
+                        <div class="flex items-center space-x-3">
+                            <div class="w-10 h-10 bg-green-100 rounded-full flex items-center justify-center">
+                                <ArrowPathIcon class="h-5 w-5 text-green-600" />
+                            </div>
+                            <h3 class="text-lg font-medium text-gray-900">Séparer le volume 00</h3>
+                        </div>
+                    </div>
+                    <div class="bg-white px-6 py-6 sm:px-8 sm:py-6">
+                        <div class="space-y-4">
+                            <div class="bg-green-50 p-4 rounded-lg border border-green-200">
+                                <p class="text-sm text-green-800 font-medium">
+                                    Le volume 00 contient {{ volumeZeroChapters.length }} chapitres et sera séparé en {{ numberOfNewVolumes }} nouveaux volumes.
+                                </p>
+                            </div>
+                            <div class="bg-green-50 p-4 rounded-lg border border-green-200">
+                                <p class="text-sm text-green-800">
+                                    <strong>Moyenne des autres volumes :</strong> {{ averageChaptersPerVolume.toFixed(1) }} chapitres par volume
+                                </p>
+                                <p class="text-sm text-green-800 mt-1">
+                                    <strong>Chapitres par nouveau volume :</strong> {{ chaptersPerNewVolume }}
+                                </p>
+                            </div>
+                            <div class="space-y-3">
+                                <h4 class="text-sm font-medium text-gray-700">Répartition proposée :</h4>
+                                <div class="space-y-2 max-h-32 overflow-y-auto">
+                                    <div v-for="(group, index) in proposedVolumeGroups" :key="index" class="text-sm text-gray-600 bg-gray-50 p-3 rounded-lg border border-gray-200">
+                                        <strong>Volume {{ group.volumeNumber }} :</strong>
+                                        Chapitres {{ group.chapters.map(c => c.number).join(', ') }}
+                                    </div>
+                                </div>
+                            </div>
+                        </div>
+                    </div>
+                    <div class="bg-gray-50 px-6 py-4 sm:px-8 sm:py-6 border-t border-gray-200">
+                        <div class="flex flex-col sm:flex-row sm:justify-end sm:space-x-3 space-y-3 sm:space-y-0">
+                            <button
+                                @click="showSplitVolumeZeroModal = false"
+                                class="w-full sm:w-auto inline-flex justify-center items-center rounded-lg border border-gray-300 bg-white px-6 py-2.5 text-sm font-medium text-gray-700 hover:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-green-500 transition-all duration-200 shadow-sm hover:shadow-md"
+                            >
+                                Annuler
+                            </button>
+                            <button
+                                @click="confirmSplitVolumeZero"
+                                class="w-full sm:w-auto inline-flex justify-center items-center rounded-lg border border-transparent bg-green-600 px-6 py-2.5 text-sm font-medium text-white hover:bg-green-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-green-500 transition-all duration-200 shadow-md hover:shadow-lg"
+                            >
+                                Confirmer la séparation
+                            </button>
+                        </div>
                     </div>
                 </div>
             </div>
@@ -416,6 +541,7 @@
 
 <script setup>
 import {
+    ArrowPathIcon,
     CheckIcon,
     ChevronDownIcon,
     ChevronRightIcon,
@@ -461,6 +587,7 @@ const localChapters = ref([]);
 const showCreateVolumeModal = ref(false);
 const showAssignModal = ref(false);
 const showMoveToVolumeModal = ref(false);
+const showSplitVolumeZeroModal = ref(false);
 const showUnassignedChapters = ref(true);
 const newVolumeNumber = ref('');
 const selectedChapter = ref(null);
@@ -532,6 +659,66 @@ const hasChanges = computed(() => {
     return localChapters.value.some(chapter => chapter.isModified);
 });
 
+// Computed properties pour la séparation du volume fourre-tout
+const volumeZeroChapters = computed(() => {
+    return localChapters.value.filter(chapter => chapter.volume === 0);
+});
+
+const hasVolumeZero = computed(() => {
+    return volumeZeroChapters.value.length > 0;
+});
+
+const otherVolumes = computed(() => {
+    return volumes.value.filter(volume => volume.number !== 0 && volume.chapters.length > 0);
+});
+
+const averageChaptersPerVolume = computed(() => {
+    if (otherVolumes.value.length === 0) return 10; // Valeur par défaut si aucun autre volume
+    const totalChapters = otherVolumes.value.reduce((sum, volume) => sum + volume.chapters.length, 0);
+    return totalChapters / otherVolumes.value.length;
+});
+
+const canSplitVolumeZero = computed(() => {
+    return hasVolumeZero.value && volumeZeroChapters.value.length > averageChaptersPerVolume.value;
+});
+
+const numberOfNewVolumes = computed(() => {
+    if (!canSplitVolumeZero.value) return 0;
+    return Math.ceil(volumeZeroChapters.value.length / averageChaptersPerVolume.value);
+});
+
+const chaptersPerNewVolume = computed(() => {
+    if (!canSplitVolumeZero.value) return 0;
+    return Math.ceil(volumeZeroChapters.value.length / numberOfNewVolumes.value);
+});
+
+const proposedVolumeGroups = computed(() => {
+    if (!canSplitVolumeZero.value) return [];
+
+    const chapters = [...volumeZeroChapters.value].sort((a, b) => a.number - b.number); // Tri croissant par numéro
+    const groups = [];
+    const chaptersPerGroup = chaptersPerNewVolume.value;
+
+    // Trouver le prochain numéro de volume disponible
+    const existingVolumeNumbers = volumes.value.map(v => v.number).filter(n => n !== 0);
+    const maxVolumeNumber = existingVolumeNumbers.length > 0 ? Math.max(...existingVolumeNumbers) : 0;
+
+    for (let i = 0; i < numberOfNewVolumes.value; i++) {
+        const startIndex = i * chaptersPerGroup;
+        const endIndex = Math.min(startIndex + chaptersPerGroup, chapters.length);
+        const groupChapters = chapters.slice(startIndex, endIndex);
+
+        if (groupChapters.length > 0) {
+            groups.push({
+                volumeNumber: maxVolumeNumber + i + 1,
+                chapters: groupChapters
+            });
+        }
+    }
+
+    return groups;
+});
+
 // Méthodes
 const handleClose = () => {
     if (!props.isSaving) {
@@ -662,6 +849,21 @@ const confirmMoveToVolume = () => {
     }
 };
 
+const confirmSplitVolumeZero = () => {
+    if (!canSplitVolumeZero.value) return;
+
+    // Appliquer la répartition proposée
+    proposedVolumeGroups.value.forEach(group => {
+        group.chapters.forEach(chapter => {
+            chapter.volume = group.volumeNumber;
+            chapter.isModified = true;
+        });
+    });
+
+    // Fermer la modale
+    showSplitVolumeZeroModal.value = false;
+};
+
 // Initialiser les chapitres locaux quand les props changent
 watch(() => props.chapters, (newChapters) => {
     localChapters.value = newChapters.map(chapter => ({
@@ -684,6 +886,7 @@ watch(() => props.isOpen, (isOpen) => {
         showCreateVolumeModal.value = false;
         showAssignModal.value = false;
         showMoveToVolumeModal.value = false;
+        showSplitVolumeZeroModal.value = false;
         showUnassignedChapters.value = true;
         newVolumeNumber.value = '';
         selectedChapter.value = null;