diff --git a/frontend/src/App.css b/frontend/src/App.css
index 47df9d9c..c5791c9b 100644
--- a/frontend/src/App.css
+++ b/frontend/src/App.css
@@ -448,3 +448,26 @@ body {
   0%, 100% { opacity: 0.4; transform: scale(0.85); }
   50%      { opacity: 1.0; transform: scale(1.0); }
 }
+
+/* Marching-ants attention border (CameraToggle while it wants a click):
+   four thin repeating-gradient strips, one per edge, sliding one dash
+   period per cycle. Drawn as backgrounds rather than a border because a
+   CSS border cannot animate its dash offset. Uses currentColor so the
+   ants inherit the button's state colour (grey idle, red on error). */
+@keyframes velxio-marching-ants {
+  to { background-position: 12px 0, -12px 100%, 0 -12px, 100% 12px; }
+}
+.velxio-ants {
+  background-image:
+    repeating-linear-gradient(90deg, currentColor 0 6px, transparent 6px 12px),
+    repeating-linear-gradient(90deg, currentColor 0 6px, transparent 6px 12px),
+    repeating-linear-gradient(0deg, currentColor 0 6px, transparent 6px 12px),
+    repeating-linear-gradient(0deg, currentColor 0 6px, transparent 6px 12px);
+  background-repeat: repeat-x, repeat-x, repeat-y, repeat-y;
+  background-size: 12px 1px, 12px 1px, 1px 12px, 1px 12px;
+  background-position: 0 0, 0 100%, 0 0, 100% 0;
+  animation: velxio-marching-ants 0.7s linear infinite;
+}
+@media (prefers-reduced-motion: reduce) {
+  .velxio-ants { animation: none; }
+}
diff --git a/frontend/src/components/simulator/CameraToggle.tsx b/frontend/src/components/simulator/CameraToggle.tsx
index fe2c95f6..d6e8ef93 100644
--- a/frontend/src/components/simulator/CameraToggle.tsx
+++ b/frontend/src/components/simulator/CameraToggle.tsx
@@ -103,9 +103,20 @@ export const CameraToggle: React.FC<CameraToggleProps> = ({ boardId }) => {
       onClick={handleClick}
       disabled={!boardId || status === 'requesting'}
       title={tooltip}
+      // Ants while the button wants a click (idle after a failed/stopped
+      // auto-start, denied, error). Solid border once streaming or asking.
+      className={
+        boardId && status !== 'streaming' && status !== 'requesting'
+          ? 'velxio-ants'
+          : undefined
+      }
       style={{
-        background: isOn ? 'rgba(63,185,80,0.15)' : 'transparent',
-        border: `1px solid ${isOn ? '#3fb950' : '#555'}`,
+        // backgroundColor, NOT the background shorthand: inline shorthand
+        // would wipe the class's background-image and kill the ants.
+        backgroundColor: isOn ? 'rgba(63,185,80,0.15)' : 'transparent',
+        border: `1px solid ${
+          isOn ? '#3fb950' : status === 'requesting' ? '#555' : 'transparent'
+        }`,
         borderRadius: 4,
         padding: '4px 10px',
         display: 'flex',