diff --git a/courses/apps.py b/courses/apps.py
index 019ba91..89f1ba2 100644
--- a/courses/apps.py
+++ b/courses/apps.py
@@ -3,4 +3,4 @@ from django.apps import AppConfig
 
 class CoursesConfig(AppConfig):
     default_auto_field = 'django.db.models.BigAutoField'
-    name = 'courses'
+    name = 'courses'
\ No newline at end of file
diff --git a/courses/urls.py b/courses/urls.py
index 11c4623..96c573e 100644
--- a/courses/urls.py
+++ b/courses/urls.py
@@ -3,7 +3,7 @@ from . import views
 
 app_name = 'courses'
 urlpatterns = [
-    path('', views.list, name='list'),
+    path('', views.list_courses, name='list'),
     # Lesson detail: /courses/<course>/<module>/<lesson>/
     path('<slug:course_slug>/<slug:module_slug>/<slug:lesson_slug>/', views.lesson_detail, name='lesson_detail'),
     path('<slug:course_name>-<int:course_id>/', views.show, name="show"),
diff --git a/courses/views.py b/courses/views.py
index 37131cb..8a33bbb 100644
--- a/courses/views.py
+++ b/courses/views.py
@@ -5,7 +5,7 @@ from django.db.models import Prefetch
 from .models import Course, Lesson, Module, Comment
 from .forms import CommentForm
 
-def list(request):
+def list_courses(request):
     courses = Course.objects.all()
     return render(request, 'courses/list.html', {'courses': courses})
 
@@ -82,6 +82,20 @@ def lesson_detail(request, course_slug, module_slug, lesson_slug):
         .order_by('order')
     )
 
+    # Compute previous and next lessons within the ordered course lessons
+    prev_lesson = None
+    next_lesson = None
+    try:
+        ids = list(lessons.values_list('id', flat=True))
+        idx = ids.index(lesson.id)
+        if idx > 0:
+            prev_lesson = next(l for l in lessons if l.id == ids[idx - 1])
+        if idx < len(ids) - 1:
+            next_lesson = next(l for l in lessons if l.id == ids[idx + 1])
+    except ValueError:
+        # current lesson not in list — keep prev/next as None
+        pass
+
     # Public comments for the current lesson (top-level) and their replies
     replies_qs = Comment.objects.filter(is_active=True).select_related('user').order_by('created_at')
     comments = (
@@ -98,5 +112,7 @@ def lesson_detail(request, course_slug, module_slug, lesson_slug):
         'lessons': lessons,
         'comments': comments,
         'comment_form': form,
+        'prev_lesson': prev_lesson,
+        'next_lesson': next_lesson,
     }
     return render(request, 'courses/lesson.html', context)
\ No newline at end of file
diff --git a/devart/settings.py b/devart/settings.py
index 103e5ea..1ba3e94 100644
--- a/devart/settings.py
+++ b/devart/settings.py
@@ -71,7 +71,6 @@ TEMPLATES = [
         'APP_DIRS': True,
         'OPTIONS': {
             'context_processors': [
-                'django.template.context_processors.debug',
                 'django.template.context_processors.request',
                 'django.contrib.auth.context_processors.auth',
                 'django.contrib.messages.context_processors.messages',
diff --git a/templates/courses/partials/_course_toc.html b/templates/courses/partials/_course_toc.html
index 6d740c8..ff400b2 100644
--- a/templates/courses/partials/_course_toc.html
+++ b/templates/courses/partials/_course_toc.html
@@ -21,6 +21,26 @@
                                         {% if lesson.video_id %}
                                             {% if not lesson.is_premium %}
                                                 <div style="padding:56.25% 0 0 0;position:relative;"><iframe src="https://player.vimeo.com/video/{{ lesson.video_id }}?badge=0&amp;autopause=0&amp;player_id=0&amp;app_id=58479" frameborder="0" allow="autoplay; fullscreen; picture-in-picture; clipboard-write; encrypted-media; web-share" referrerpolicy="strict-origin-when-cross-origin" style="position:absolute;top:0;left:0;width:100%;height:100%;" title="1"></iframe></div><script src="https://player.vimeo.com/api/player.js"></script>
+                                                <div class="videoNav" style="display:flex; justify-content:space-between; gap:12px; margin:12px 0 20px 0;">
+                                                    <div>
+                                                        {% if prev_lesson %}
+                                                            <a class="btn btn-secondary" href="{% url 'courses:lesson_detail' course.slug prev_lesson.module.slug prev_lesson.slug %}">
+                                                                ← Vidéo précédente
+                                                            </a>
+                                                        {% else %}
+                                                            <span class="btn btn-secondary" aria-disabled="true" style="opacity:.5; pointer-events:none;">← Vidéo précédente</span>
+                                                        {% endif %}
+                                                    </div>
+                                                    <div>
+                                                        {% if next_lesson %}
+                                                            <a class="btn btn-primary" href="{% url 'courses:lesson_detail' course.slug next_lesson.module.slug next_lesson.slug %}">
+                                                                Vidéo suivante →
+                                                            </a>
+                                                        {% else %}
+                                                            <span class="btn btn-primary" aria-disabled="true" style="opacity:.5; pointer-events:none;">Vidéo suivante →</span>
+                                                        {% endif %}
+                                                    </div>
+                                                </div>
                                             {% else %}
                                                 {% if not user.profile.is_premium %}
                                                     <div class="alert premium-lock" role="note" aria-live="polite">
@@ -47,7 +67,6 @@
                                             {% endif %}
                                         {% endif %}
                                         {{ lesson.content|safe }}
-                                    </article>
                                     <h3 id="comments">Commentaires</h3>
                                     <div class="lessonComments">
                                         {% if comments %}
@@ -229,8 +248,9 @@
                                             });
                                         })();
                                     </script>
-                                    </div>
-                                </div>
+                                    </div> <!-- /.lessonComments -->
+                                </div> <!-- /.lesson -->
+                                </div> <!-- /.lessonInline -->
                             {% endif %}
                         </li>
                     {% endfor %}