app.js

@@ -2789,9 +2789,11 @@ document.getElementById('podcast-toggle').addEventListener('click', () => {
         utterance.rate = 0.9;
         utterance.pitch = 0.9;
         btn.textContent = '⏹';
+        btn.classList.add('active');
         speechSynthesis.speak(utterance);
         utterance.onend = () => {
           btn.textContent = '🎧';
+          btn.classList.remove('active');
         };
       })
       .catch(err => {
@@ -2802,6 +2804,7 @@ document.getElementById('podcast-toggle').addEventListener('click', () => {
   } else {
     speechSynthesis.cancel();
     btn.textContent = '🎧';
+    btn.classList.remove('active');
   }
 });
 

style.css

@@ -70,6 +70,10 @@ canvas {
   cursor: pointer;
 }
 
+#podcast-toggle.active {
+  background-color: #0066cc;
+}
+
 #podcast-toggle:hover {
   background-color: var(--color-primary);
 }