diff --git a/app/templates/audit.html b/app/templates/audit.html
index dcc5dd3..95d53f1 100644
--- a/app/templates/audit.html
+++ b/app/templates/audit.html
@@ -60,7 +60,7 @@
                     <p class="text-xs text-gray-600 mt-2">EMV exclu par défaut (zone PCI-DSS)</p>
                 </div>
             </div>
-            <button type="submit" class="btn-primary px-4 py-2 text-sm" onclick="this.textContent='Audit global en cours...'; this.disabled=true; this.form.submit()">Lancer l'audit général</button>
+            <button type="submit" class="btn-primary px-4 py-2 text-sm" data-loading="Audit global en cours...|Connexion SSH - plusieurs minutes">Lancer l'audit général</button>
         </form>
     </div>
 </div>
diff --git a/app/templates/audit_specific.html b/app/templates/audit_specific.html
index c11ddca..39233f2 100644
--- a/app/templates/audit_specific.html
+++ b/app/templates/audit_specific.html
@@ -31,7 +31,7 @@
             </div>
         </div>
         <p class="text-xs text-gray-600">Si plus de 10 serveurs, le parallélisme est recommandé.</p>
-        <button type="submit" class="btn-primary px-4 py-2 text-sm" onclick="this.textContent='Audit en cours...'; this.disabled=true; this.form.submit()">Lancer l'audit</button>
+        <button type="submit" class="btn-primary px-4 py-2 text-sm" data-loading="Audit en cours...|Connexion SSH - peut prendre quelques minutes">Lancer l'audit</button>
     </form>
 </div>
 {% endblock %}
diff --git a/app/templates/base.html b/app/templates/base.html
index e822704..d24c161 100644
--- a/app/templates/base.html
+++ b/app/templates/base.html
@@ -92,5 +92,31 @@
         {% block fullpage %}{% endblock %}
     {% endif %}
     <div id="toast-container"></div>
+    <!-- Overlay chargement -->
+    <div id="loading-overlay" style="display:none; position:fixed; top:0; left:0; width:100%; height:100%; background:rgba(10,14,23,0.85); z-index:9999; justify-content:center; align-items:center;">
+        <div style="text-align:center">
+            <div style="border:3px solid #1e3a5f; border-top:3px solid #00d4ff; border-radius:50%; width:40px; height:40px; animation:spin 1s linear infinite; margin:0 auto 16px"></div>
+            <div id="loading-msg" style="color:#00d4ff; font-size:14px; font-weight:600">Opération en cours...</div>
+            <div id="loading-sub" style="color:#94a3b8; font-size:12px; margin-top:6px"></div>
+        </div>
+    </div>
+    <style>@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }</style>
+    <script>
+    function showLoading(msg, sub) {
+        document.getElementById('loading-msg').textContent = msg || 'Opération en cours...';
+        document.getElementById('loading-sub').textContent = sub || '';
+        document.getElementById('loading-overlay').style.display = 'flex';
+    }
+    function hideLoading() { document.getElementById('loading-overlay').style.display = 'none'; }
+    // Auto-attach: tout bouton avec data-loading affiche l'overlay au clic
+    document.addEventListener('DOMContentLoaded', function() {
+        document.querySelectorAll('[data-loading]').forEach(function(btn) {
+            btn.addEventListener('click', function(e) {
+                var parts = (btn.dataset.loading || 'Opération en cours...|').split('|');
+                showLoading(parts[0], parts[1] || '');
+            });
+        });
+    });
+    </script>
 </body>
 </html>
diff --git a/app/templates/campaign_detail.html b/app/templates/campaign_detail.html
index 6624664..fbaf8fe 100644
--- a/app/templates/campaign_detail.html
+++ b/app/templates/campaign_detail.html
@@ -93,7 +93,7 @@
     <div class="flex justify-between items-center mb-2">
         <h3 class="text-sm font-bold text-cyber-accent">Prérequisuis ({{ prereq.prereq_ok }}/{{ prereq.total_pending }} valides)</h3>
         <form method="POST" action="/campaigns/{{ c.id }}/check-prereqs">
-            <button class="btn-primary px-3 py-1 text-sm">Vérifier prereqs</button>
+            <button class="btn-primary px-3 py-1 text-sm" data-loading="Vérification des prérequis...|Test SSH + disque + satellite"Vérification des prérequis...", "Test SSH + espace disque + satellite pour chaque serveur")">Vérifier prereqs</button>
         </form>
     </div>
     <div class="grid grid-cols-5 gap-3 text-sm">
diff --git a/app/templates/qualys_search.html b/app/templates/qualys_search.html
index e6a469d..8592370 100644
--- a/app/templates/qualys_search.html
+++ b/app/templates/qualys_search.html
@@ -63,7 +63,7 @@
                 onclick="document.getElementById('bulk-add-tag-id').value='{{ t.qualys_tag_id }}'; document.getElementById('bulk-add-input').value='{{ t.name }}'; document.getElementById('bulk-add-dd').style.display='none'">
                 <span class="font-mono">{{ t.name }}</span></div>{% endfor %}
         </div>
-        <button type="submit" class="btn-sm bg-cyber-accent text-black">+ Ajouter</button>
+        <button type="submit" class="btn-sm bg-cyber-accent text-black" data-loading="Ajout de tag en masse...|Appel API Qualys pour chaque asset">+ Ajouter</button>
     </form>
     <form method="POST" action="/qualys/bulk/remove-tag" class="flex gap-2 items-center relative">
         <input type="hidden" name="asset_ids" id="bulk-tag-ids2">
@@ -75,13 +75,13 @@
         <div id="bulk-rm-dd" class="absolute top-8 left-0 bg-cyber-card border border-cyber-border rounded overflow-y-auto text-xs z-50" style="display:none; max-height:150px; width:250px">
             <div class="px-2 py-1 text-gray-500">Chargement...</div>
         </div>
-        <button type="submit" class="btn-sm bg-red-900/30 text-cyber-red">- Retirer</button>
+        <button type="submit" class="btn-sm bg-red-900/30 text-cyber-red" data-loading="Retrait de tag en masse...|Appel API Qualys pour chaque asset">- Retirer</button>
     </form>
     <form method="POST" action="/qualys/resync-assets" class="flex gap-2 items-center">
         <input type="hidden" name="asset_ids" id="bulk-tag-ids3">
         <input type="hidden" name="return_search" value="{{ search or '' }}">
         <input type="hidden" name="return_field" value="{{ field or 'hostname' }}">
-        <button type="submit" class="btn-sm bg-cyber-border text-cyber-accent">Resync Qualys</button>
+        <button type="submit" class="btn-sm bg-cyber-border text-cyber-accent" data-loading="Resynchronisation Qualys...|Mise à jour depuis API">Resync Qualys</button>
     </form>
 </div>
 <script>
diff --git a/app/templates/qualys_tags.html b/app/templates/qualys_tags.html
index 62975b6..0cd995c 100644
--- a/app/templates/qualys_tags.html
+++ b/app/templates/qualys_tags.html
@@ -6,7 +6,7 @@
     <div class="flex gap-2">
         {% if can_edit_qualys %}
         <form method="POST" action="/qualys/tags/resync" style="display:inline">
-            <button class="btn-sm bg-cyber-border text-cyber-accent">Resync API</button>
+            <button class="btn-sm bg-cyber-border text-cyber-accent" data-loading="Synchronisation des tags Qualys...|Cette opération peut prendre 1 à 2 minutes">Resync API</button>
         </form>
         {% endif %}
         <a href="/qualys/tags/export" class="btn-sm bg-cyber-green text-black">Export CSV</a>
diff --git a/app/templates/specifics.html b/app/templates/specifics.html
index 5f3b161..944e942 100644
--- a/app/templates/specifics.html
+++ b/app/templates/specifics.html
@@ -8,7 +8,7 @@
 {% set msg = request.query_params.get('msg') %}
 {% if msg %}
 <div class="mb-4 p-2 rounded text-sm {% if msg in ('not_found','exists') %}bg-red-900/30 text-cyber-red{% else %}bg-green-900/30 text-cyber-green{% endif %}">
-    {% if msg == 'saved' %}Spécificités sauvegardées.{% elif msg == 'added' %}Serveur ajouté.{% elif msg == 'not_found' %}Hostname non trouvé en base.{% elif msg == 'exists' %}Ce serveur a déjà des spécificités.{% endif %}
+    {% if msg == 'saved' %}Specificites sauvegardees.{% elif msg == 'added' %}Serveur ajoute.{% elif msg == 'not_found' %}Hostname non trouve en base.{% elif msg == 'exists' %}Ce serveur a deja des specificites.{% endif %}
 </div>
 {% endif %}
 
@@ -24,6 +24,9 @@
     </form>
 </div>
 
+<!-- Panel édition -->
+<div id="edit-panel" class="card mb-4 p-5" style="display:none"></div>
+
 <!-- Table -->
 <div class="card overflow-x-auto">
     <table class="w-full table-cyber">
@@ -73,7 +76,6 @@
 </div>
 
 <!-- Panel edition -->
-<div id="edit-panel" class="card mt-4 p-5" style="display:none"></div>
 
 <!-- Ajouter -->
 <div class="card p-4 mt-4">