diff --git a/.gitignore b/.gitignore
index 2dbd9da..4c0f15d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -38,3 +38,8 @@ Thumbs.db
 .idea/
 .vscode/
 
+# Environnement local de développement (exclu de Git)
+/.dev
+/.env
+/.env.local
+
diff --git a/public/index.php b/public/index.php
index af2f208..4dadb83 100644
--- a/public/index.php
+++ b/public/index.php
@@ -19,6 +19,10 @@ $hasBranding = !empty($companyName) || !empty($companyLogo);
 
 $appVerData = file_exists(__DIR__ . '/../version.json') ? json_decode((string)file_get_contents(__DIR__ . '/../version.json'), true) : [];
 $appVersion = $appVerData['version'] ?? '1.5.0';
+
+// Détection de l'environnement de développement : présence de .dev local ou branche git dev
+$isDevEnv = file_exists(__DIR__ . '/../.dev') 
+    || (trim((string)@shell_exec('git -C ' . escapeshellarg(__DIR__) . ' rev-parse --abbrev-ref HEAD 2>/dev/null')) === 'dev');
 ?>
 <!DOCTYPE html>
 <html lang="fr" class="h-full">
@@ -26,7 +30,7 @@ $appVersion = $appVerData['version'] ?? '1.5.0';
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <meta name="nexus-app-version" content="<?= htmlspecialchars($appVersion) ?>">
-    <title>NexusPBX — Supervision & Téléphonie IP • Powered by Asterisk</title>
+    <title><?= $isDevEnv ? '🛠️ [DEV] ' : '' ?>NexusPBX — Supervision & Téléphonie IP • Powered by Asterisk</title>
     <link rel="icon" type="image/png" href="/assets/favicon.png?v=<?= file_exists(__DIR__ . '/assets/favicon.png') ? filemtime(__DIR__ . '/assets/favicon.png') : 1 ?>">
     <link rel="apple-touch-icon" href="/assets/logo.png?v=<?= file_exists(__DIR__ . '/assets/logo.png') ? filemtime(__DIR__ . '/assets/logo.png') : 1 ?>">
     <script src="https://cdn.tailwindcss.com"></script>
@@ -162,7 +166,12 @@ $appVersion = $appVerData['version'] ?? '1.5.0';
             <div class="flex items-center gap-4 mb-6">
                 <img src="/assets/logo.png?v=<?= file_exists(__DIR__ . '/assets/logo.png') ? filemtime(__DIR__ . '/assets/logo.png') : 1 ?>" alt="NexusPBX Logo" class="w-20 h-20 sm:w-24 sm:h-24 object-contain shrink-0 filter drop-shadow-xl">
                 <div>
-                    <h1 class="text-2xl sm:text-3xl font-black text-white tracking-tight leading-none mb-1">NexusPBX</h1>
+                    <h1 class="text-2xl sm:text-3xl font-black text-white tracking-tight leading-none mb-1 flex items-center gap-2">
+                        NexusPBX
+                        <?php if ($isDevEnv): ?>
+                            <span class="px-2 py-0.5 text-xs font-mono font-extrabold tracking-wider rounded bg-amber-500/20 text-amber-300 border border-amber-500/40">DEV</span>
+                        <?php endif; ?>
+                    </h1>
                     <p class="text-xs text-slate-300">Supervision & Téléphonie IP • Powered by Asterisk</p>
                 </div>
             </div>
@@ -212,6 +221,9 @@ $appVersion = $appVerData['version'] ?? '1.5.0';
                                         Nexus<span class="text-indigo-400">PBX</span>
                                     </div>
                                     <span id="app-version-badge" class="px-1.5 py-0.5 text-[10px] font-mono font-bold tracking-wider rounded bg-indigo-500/20 text-indigo-300 border border-indigo-500/30">v<?= htmlspecialchars($appVersion) ?></span>
+                                    <?php if ($isDevEnv): ?>
+                                        <span class="px-1.5 py-0.5 text-[10px] font-mono font-black tracking-wider rounded bg-amber-500/25 text-amber-300 border border-amber-500/50 shadow-xs shadow-amber-500/20 animate-pulse">DEV</span>
+                                    <?php endif; ?>
                                 </div>
                                 <div class="text-[10px] text-slate-400 font-medium tracking-wide mt-0.5">Powered by Asterisk</div>
                             </div>
@@ -494,6 +506,13 @@ $appVersion = $appVerData['version'] ?? '1.5.0';
 
                 <!-- Boutons d'action globaux -->
                 <div class="flex items-center gap-2.5">
+                    <?php if ($isDevEnv): ?>
+                        <div class="inline-flex items-center gap-1.5 px-3 py-1.5 rounded-xl text-xs font-bold bg-amber-500/15 text-amber-300 border border-amber-500/30">
+                            <span class="w-2 h-2 rounded-full bg-amber-400 animate-pulse"></span>
+                            <span class="hidden md:inline font-mono">SERVEUR</span> DEV
+                        </div>
+                    <?php endif; ?>
+
                     <!-- Badge Notification Mise à Jour Disponible -->
                     <button id="header-update-badge" type="button" onclick="openUpdatePanel()" style="display:none;"
                         class="inline-flex items-center gap-1.5 px-3 py-1.5 rounded-xl text-xs font-bold bg-amber-500/20 hover:bg-amber-500/30 text-amber-300 border border-amber-500/40 shadow-sm transition animate-pulse" title="Une mise à jour NexusPBX est disponible ! Cliquez pour voir les détails.">