diff --git a/src/app_security.cpp b/src/app_security.cpp
index 04d4976..aa8a8ee 100644
--- a/src/app_security.cpp
+++ b/src/app_security.cpp
@@ -771,11 +771,29 @@ void App::renderLockScreen() {
     ImVec2 winPos = ImGui::GetWindowPos();
     ImVec2 winSize = ImGui::GetWindowSize();
 
-    // Optional backdrop (0 = no darkening)
-    float backdropAlpha = ui::schema::UI().drawElement("screens.lock-screen", "backdrop-alpha").opacity;
-    if (backdropAlpha > 0.0f) {
-        ImU32 backdropCol = IM_COL32(0, 0, 0, (int)(255 * backdropAlpha));
-        dl->AddRectFilled(winPos, ImVec2(winPos.x + winSize.x, winPos.y + winSize.y), backdropCol);
+    // Live-blur backdrop over the wallet content while locked — matches the app's modal look AND
+    // obscures the wallet for privacy (the old backdrop defaulted to 0 = fully visible). Capture-once
+    // on lock-open + resize; the opaque base inside DrawFullWindowBlurBackdrop guarantees the wallet
+    // is obscured even when the blur is unavailable (low-spec / acrylic-off / first frame / capture
+    // failure), so this can't leak content. Purely visual — the auth logic below is untouched.
+    ImVec2 winMax(winPos.x + winSize.x, winPos.y + winSize.y);
+    {
+        BlurCaptureState& cap = BlurCaptureStateFor("##LockScreen");
+        int frame = ImGui::GetFrameCount();
+        bool justLocked = (cap.lastSeenFrame < frame - 1);
+        cap.lastSeenFrame = frame;
+        if (justLocked || cap.w != winSize.x || cap.h != winSize.y) cap.captureFrames = 3;
+        cap.w = winSize.x; cap.h = winSize.y;
+        CapturingBlurBackdropRef() = (cap.captureFrames > 0);
+        if (cap.captureFrames > 0) {
+            if (ImDrawCallback liveCap = ui::effects::ImGuiAcrylic::GetLiveCaptureCallback()) {
+                dl->AddCallback(liveCap, nullptr);
+                dl->AddCallback(ImDrawCallback_ResetRenderState, nullptr);
+            }
+            cap.captureFrames--;
+        }
+        DrawFullWindowBlurBackdrop(dl, winPos, winMax, /*allowBlur=*/!justLocked);
+        MarkBlurOverlayDrawn(nullptr);  // suppress foreground theme-effect bleed + re-capture on unlock
     }
 
     // Card