diff --git a/frontend/app.js b/frontend/app.js
index 27e9f6c..f35cc28 100644
--- a/frontend/app.js
+++ b/frontend/app.js
@@ -2180,8 +2180,8 @@
     ]);
     openNewWindowBtn.addEventListener("click", () => {
       const currentUrl = window.location.origin + window.location.pathname;
-      const fileUrl = `${currentUrl}#file=${encodeURIComponent(data.vault)}:${encodeURIComponent(data.path)}`;
-      window.open(fileUrl, '_blank');
+      const fileUrl = `${currentUrl}?popup=true#file=${encodeURIComponent(data.vault)}:${encodeURIComponent(data.path)}`;
+      window.open(fileUrl, '_blank', 'menubar=no,toolbar=no,location=no,status=no,width=1000,height=800');
     });
 
     // Frontmatter
@@ -3962,6 +3962,23 @@
     if (authOk) {
       try {
         await Promise.all([loadVaults(), loadTags()]);
+        
+        // Check for popup mode query parameter
+        const urlParams = new URLSearchParams(window.location.search);
+        if (urlParams.get("popup") === "true") {
+          document.body.classList.add("popup-mode");
+        }
+
+        // Handle direct deep-link to file via #file=...
+        if (window.location.hash && window.location.hash.startsWith("#file=")) {
+          const hashVal = window.location.hash.substring(6);
+          const sepIndex = hashVal.indexOf(":");
+          if (sepIndex > -1) {
+            const vault = decodeURIComponent(hashVal.substring(0, sepIndex));
+            const path = decodeURIComponent(hashVal.substring(sepIndex + 1));
+            openFile(vault, path);
+          }
+        }
       } catch (err) {
         console.error("Failed to initialize ObsiGate:", err);
         showToast("Erreur lors de l'initialisation");
diff --git a/frontend/style.css b/frontend/style.css
index f5fb1ba..c1627b0 100644
--- a/frontend/style.css
+++ b/frontend/style.css
@@ -3329,3 +3329,27 @@ body.resizing-v {
   gap: 8px;
   margin-top: 20px;
 }
+
+/* ---------------------------------------------------------------------------
+   Popup Mode (Nouvelle fenêtre)
+   --------------------------------------------------------------------------- */
+body.popup-mode .top-nav,
+body.popup-mode .sidebar,
+body.popup-mode .resizer,
+body.popup-mode .content-header {
+  display: none !important;
+}
+body.popup-mode .main-layout {
+  height: 100vh;
+}
+body.popup-mode .content-area {
+  margin: 15px auto;
+  padding: 30px;
+  border: 1px solid var(--border);
+  border-radius: 12px;
+  height: calc(100vh - 30px);
+  max-width: 1000px;
+  overflow-y: auto;
+  box-shadow: 0 8px 30px rgba(0,0,0,0.15);
+  box-sizing: border-box;
+}