diff --git a/src/app/issues/issue-detail/issue-detail.css b/src/app/issues/issue-detail/issue-detail.css
index 27e530b..d28d426 100644
--- a/src/app/issues/issue-detail/issue-detail.css
+++ b/src/app/issues/issue-detail/issue-detail.css
@@ -85,6 +85,15 @@
   min-width: 200px;
 }
 
+.composed-issue-item {
+  cursor: pointer;
+  transition: background-color 0.1s;
+}
+
+.composed-issue-item:hover {
+  background-color: #f9fafb;
+}
+
 /* Description */
 .description-textarea {
   min-height: 40rem;
diff --git a/src/app/issues/issue-detail/issue-detail.html b/src/app/issues/issue-detail/issue-detail.html
index 9bbf291..67cbcd9 100644
--- a/src/app/issues/issue-detail/issue-detail.html
+++ b/src/app/issues/issue-detail/issue-detail.html
@@ -17,14 +17,16 @@
         <option [value]="status">{{ status }}</option>
       }
     </select>
-    <div class="more-wrapper">
-      <button type="button" class="btn btn-outline-secondary btn-sm" (click)="toggleMoreMenu()">···</button>
-      @if (moreMenuOpen) {
-        <div class="more-menu dropdown-menu show">
-          <button type="button" class="dropdown-item text-danger" (click)="deleteIssue()">Supprimer</button>
-        </div>
-      }
-    </div>
+    @if (!isNewIssueRoute) {
+      <div class="more-wrapper">
+        <button type="button" class="btn btn-outline-secondary btn-sm" (click)="toggleMoreMenu()">···</button>
+        @if (moreMenuOpen) {
+          <div class="more-menu dropdown-menu show">
+            <button type="button" class="dropdown-item text-danger" (click)="deleteIssue()">Supprimer</button>
+          </div>
+        }
+      </div>
+    }
   </div>
 </div>
 
@@ -32,13 +34,19 @@
 <div class="card shadow-sm mb-3">
   <div class="card-body py-2">
     <input
+      #titleInput="ngModel"
       aria-label="Titre"
       class="title-input form-control border-0 shadow-none p-0 fw-semibold fs-5"
+      [class.is-invalid]="titleInput.invalid && titleInput.touched"
       type="text"
       placeholder="Titre de l'issue..."
+      required
       [(ngModel)]="issue.name"
       (blur)="saveIssue()"
     />
+    @if (titleInput.invalid && titleInput.touched) {
+      <div class="text-danger small mt-1">Le titre est obligatoire.</div>
+    }
   </div>
 </div>
 
@@ -67,12 +75,17 @@
         @if (!isEpicIssue) {
           <div>
             <label class="field-label">Epic</label>
-            <select aria-label="Epic" class="form-select form-select-sm" [(ngModel)]="issue.epic" (change)="saveIssue()">
-              <option value="">—</option>
-              @for (epicIssue of epicIssues; track epicIssue.id) {
-                <option [value]="epicIssue.name">{{ epicIssue.name }}</option>
+            <div class="d-flex gap-2 align-items-center">
+              <select aria-label="Epic" class="form-select form-select-sm" [(ngModel)]="issue.epic" (change)="saveIssue()">
+                <option value="">—</option>
+                @for (epicIssue of epicIssues; track epicIssue.id) {
+                  <option [value]="epicIssue.name">{{ epicIssue.name }}</option>
+                }
+              </select>
+              @if (epicIssueId !== null) {
+                <button type="button" class="btn btn-sm btn-outline-secondary flex-shrink-0" (click)="navigateToEpic()" title="Voir l'Epic">↗</button>
               }
-            </select>
+            </div>
           </div>
         }
       </div>
@@ -180,15 +193,61 @@
     } @else {
       <ul class="list-group list-group-flush">
         @for (composedIssue of composedIssues; track composedIssue.id) {
-          <li class="list-group-item d-flex justify-content-between align-items-center gap-3 py-3">
-            <div>
-              <p class="mb-0 fw-semibold">#{{ composedIssue.id }} – {{ composedIssue.name || 'Sans nom' }}</p>
-              <p class="mb-0 text-secondary small">{{ composedIssue.type }} · {{ composedIssue.status }}</p>
+          <li
+            class="list-group-item d-flex justify-content-between align-items-center gap-3 py-3 composed-issue-item"
+            (click)="openComposedIssue(composedIssue.id)"
+          >
+            <div class="d-flex align-items-center gap-2 flex-wrap">
+              <span [class]="'badge ' + getBadgeClass(composedIssue.type)">{{ composedIssue.type }}</span>
+              <span class="fw-semibold">#{{ composedIssue.id }} – {{ composedIssue.name || 'Sans nom' }}</span>
+            </div>
+            <div class="d-flex align-items-center gap-3 flex-shrink-0">
+              <span class="text-secondary small">{{ composedIssue.priority }}</span>
+              <span class="text-secondary small text-nowrap">{{ composedIssue.assignee || 'Non assigné' }}</span>
             </div>
-            <span class="text-secondary small text-nowrap">{{ composedIssue.assignee || 'Non assigné' }}</span>
           </li>
         }
       </ul>
     }
+    <div class="card-footer bg-white">
+      @if (showCreateInEpic) {
+        <div class="d-flex gap-2 flex-wrap">
+          <input
+            aria-label="Titre de la nouvelle issue"
+            class="form-control form-control-sm dep-select"
+            type="text"
+            placeholder="Titre de l'issue..."
+            [(ngModel)]="newIssueName"
+            (keydown.enter)="confirmCreateInEpic()"
+            (keydown.escape)="cancelCreateInEpic()"
+          />
+          <button type="button" class="btn btn-sm btn-primary text-nowrap" (click)="confirmCreateInEpic()" [disabled]="!newIssueName.trim()">Créer</button>
+          <button type="button" class="btn btn-sm btn-outline-secondary text-nowrap" (click)="cancelCreateInEpic()">Annuler</button>
+        </div>
+      } @else if (showAddToEpic) {
+        <div class="d-flex gap-2 flex-wrap">
+          <select aria-label="Choisir une issue à ajouter à l'epic" class="form-select form-select-sm dep-select" [(ngModel)]="selectedEpicCandidateId">
+            <option [ngValue]="null">Choisir une issue...</option>
+            @for (candidate of epicCandidates; track candidate.id) {
+              <option [ngValue]="candidate.id">#{{ candidate.id }} – {{ candidate.name || 'Sans nom' }}</option>
+            }
+          </select>
+          <button type="button" class="btn btn-sm btn-primary text-nowrap" (click)="confirmAddToEpic()" [disabled]="selectedEpicCandidateId === null">Ajouter</button>
+          <button type="button" class="btn btn-sm btn-outline-secondary text-nowrap" (click)="cancelAddToEpic()">Annuler</button>
+        </div>
+      } @else {
+        <div class="d-flex gap-2">
+          <button type="button" class="btn btn-sm btn-primary" (click)="openCreateInEpic()">+ Créer une issue</button>
+          <button type="button" class="btn btn-sm btn-outline-secondary" (click)="openAddToEpic()">Ajouter une existante</button>
+        </div>
+      }
+    </div>
+  </div>
+}
+
+@if (isNewIssueRoute) {
+  <div class="d-flex justify-content-end gap-2 mt-4">
+    <button type="button" class="btn btn-outline-secondary" (click)="cancelCreation()">Annuler</button>
+    <button type="button" class="btn btn-primary" (click)="saveIssue(true)" [disabled]="!issue.name.trim()">Créer l'issue</button>
   </div>
 }
diff --git a/src/app/issues/issue-detail/issue-detail.ts b/src/app/issues/issue-detail/issue-detail.ts
index 1a54eac..2810d30 100644
--- a/src/app/issues/issue-detail/issue-detail.ts
+++ b/src/app/issues/issue-detail/issue-detail.ts
@@ -1,4 +1,5 @@
 import { Component, inject } from '@angular/core';
+import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
 import { FormsModule } from '@angular/forms';
 import { DomSanitizer, SafeHtml } from '@angular/platform-browser';
 import { ActivatedRoute, Router } from '@angular/router';
@@ -16,14 +17,33 @@ export class IssueDetail {
   private readonly router = inject(Router);
   private readonly issuesStore = inject(IssuesStore);
   private readonly sanitizer = inject(DomSanitizer);
-  private readonly isNewIssueRoute = this.route.snapshot.routeConfig?.path === 'issues/new';
+  protected readonly isNewIssueRoute = this.route.snapshot.routeConfig?.path === 'issues/new';
 
   protected issue: IssueEntity = this.buildIssue();
   protected readonly issues = this.issuesStore.issues;
   protected moreMenuOpen = false;
+
+  constructor() {
+    this.route.paramMap.pipe(takeUntilDestroyed()).subscribe((params) => {
+      const id = Number(params.get('id'));
+      if (!id || isNaN(id)) return;
+      const existingIssue = this.issuesStore.getById(id);
+      if (existingIssue) {
+        this.issue = { ...existingIssue };
+        this.editingDescription = false;
+        this.showAddDependency = false;
+        this.showAddToEpic = false;
+        this.showCreateInEpic = false;
+      }
+    });
+  }
   protected showAddDependency = false;
   protected selectedCandidateId: number | null = null;
   protected editingDescription = false;
+  protected showAddToEpic = false;
+  protected selectedEpicCandidateId: number | null = null;
+  protected showCreateInEpic = false;
+  protected newIssueName = '';
 
   protected readonly statusOptions: IssueEntity['status'][] = [
     'draft',
@@ -107,6 +127,66 @@ export class IssueDetail {
     );
   }
 
+  protected get epicCandidates(): IssueEntity[] {
+    const composedIds = new Set(this.composedIssues.map((i) => i.id));
+    return this.issues().filter(
+      (issue) => issue.id !== this.issue.id && !composedIds.has(issue.id),
+    );
+  }
+
+  protected openCreateInEpic(): void {
+    this.newIssueName = '';
+    this.showCreateInEpic = true;
+    this.showAddToEpic = false;
+  }
+
+  protected cancelCreateInEpic(): void {
+    this.showCreateInEpic = false;
+    this.newIssueName = '';
+  }
+
+  protected confirmCreateInEpic(): void {
+    const name = this.newIssueName.trim();
+    if (!name) return;
+    this.issuesStore.upsert({
+      id: this.issuesStore.getNextId(),
+      type: 'Story',
+      assignee: '',
+      epic: this.issue.name,
+      name,
+      dueDate: '',
+      description: '',
+      estimatedTime: null,
+      dependsOnIds: [],
+      priority: 'Moyenne',
+      status: 'draft',
+      progress: 0,
+    });
+    this.showCreateInEpic = false;
+    this.newIssueName = '';
+  }
+
+  protected openAddToEpic(): void {
+    this.selectedEpicCandidateId = null;
+    this.showAddToEpic = true;
+  }
+
+  protected cancelAddToEpic(): void {
+    this.showAddToEpic = false;
+    this.selectedEpicCandidateId = null;
+  }
+
+  protected confirmAddToEpic(): void {
+    if (this.selectedEpicCandidateId !== null) {
+      const target = this.issues().find((i) => i.id === this.selectedEpicCandidateId);
+      if (target) {
+        this.issuesStore.upsert({ ...target, epic: this.issue.name });
+      }
+    }
+    this.showAddToEpic = false;
+    this.selectedEpicCandidateId = null;
+  }
+
   protected get isEpicIssue(): boolean {
     return this.issueTypeValue === 'Epic';
   }
@@ -117,6 +197,10 @@ export class IssueDetail {
   }
 
   protected get typeBadgeClass(): string {
+    return this.getBadgeClass(this.issueTypeValue);
+  }
+
+  protected getBadgeClass(type: IssueEntity['type']): string {
     const map: Record<IssueEntity['type'], string> = {
       Bug: 'text-bg-danger',
       Study: 'text-bg-secondary',
@@ -125,16 +209,37 @@ export class IssueDetail {
       'Technical Story': 'text-bg-warning',
       Epic: 'text-bg-info',
     };
-    return map[this.issueTypeValue] ?? 'text-bg-secondary';
+    return map[type] ?? 'text-bg-secondary';
   }
 
-  protected saveIssue(): void {
+  protected openComposedIssue(id: number): void {
+    this.router.navigate(['/issues', id]);
+  }
+
+  protected get epicIssueId(): number | null {
+    const epic = this.epicIssues.find((e) => e.name === this.issue.epic);
+    return epic?.id ?? null;
+  }
+
+  protected navigateToEpic(): void {
+    if (this.epicIssueId !== null) {
+      this.router.navigate(['/issues', this.epicIssueId]);
+    }
+  }
+
+  protected saveIssue(explicit = false): void {
+    if (this.isNewIssueRoute && !explicit) return;
+    if (!this.issue.name.trim()) return;
     this.issuesStore.upsert(this.issue);
     if (this.isNewIssueRoute) {
       this.router.navigate(['/issues', this.issue.id]);
     }
   }
 
+  protected cancelCreation(): void {
+    this.router.navigate(['/issues']);
+  }
+
   protected deleteIssue(): void {
     this.issuesStore.deleteById(this.issue.id);
     this.router.navigate(['/issues']);