diff --git a/static/audioplayer.js b/static/audioplayer.js
index 6171f9c..d62db3d 100644
--- a/static/audioplayer.js
+++ b/static/audioplayer.js
@@ -56,6 +56,8 @@ timeline.addEventListener('touchcancel', () => { isSeeking = false; });
 audio.addEventListener('loadedmetadata', () => {
   timeline.min = 0;
   timeline.max = audio.duration;
+  timeline.value = 0;
+  timeline.style.backgroundSize = '0% 100%';
 });
 
 
@@ -86,32 +88,20 @@ function formatTime(seconds) {
 
 
 // --- Update timeline, time info, and media session on each time update ---
-let lastPosCall = 0;
-audio.ontimeupdate = () => {
-  // — your slider + time display update —
-  if (!isSeeking) {
+function updateTimeline() {
+  if (!isSeeking && audio.duration) {
     timeline.value = audio.currentTime;
     timeline.style.backgroundSize = `${(audio.currentTime / audio.duration) * 100}% 100%`;
+    timeInfo.textContent = `${formatTime(audio.currentTime)} / ${formatTime(audio.duration)}`;
   }
-  timeInfo.textContent = `${formatTime(audio.currentTime)} / ${formatTime(audio.duration)}`;
+}
 
-  // — throttled Media Session update —
-  if (
-    'mediaSession' in navigator &&
-    'setPositionState' in navigator.mediaSession &&
-    !isNaN(audio.duration)
-  ) {
-    const now = performance.now();
-    if (now - lastPosCall > 1000) {
-      lastPosCall = now;
-      navigator.mediaSession.setPositionState({
-        duration: audio.duration,
-        playbackRate: audio.playbackRate,
-        position: audio.currentTime
-      });
-    }
-  }
-};
+audio.ontimeupdate = updateTimeline;
+
+// Fallback for mobile throttling
+setInterval(() => {
+  if (!audio.paused && !isSeeking) updateTimeline();
+}, 500);
 
 
 // --- When audio ends ---