Update index.html

index.html

@@ -1293,6 +1293,8 @@
                 let lastVolume = 1;
                 let currentPlaybackRate = 1;
                 let isFullscreen = false;
+                let isCheckingSync = false;
+                let isInBackgroundTab = false;
             
                 async function enterPiP() {
                 if (!document.pictureInPictureElement && !video.paused) {
@@ -1509,8 +1511,6 @@
                         enablePlayerControls();
             
                         previewSection.style.display = 'block';
-            let isCheckingSync = false;
-            let isInBackgroundTab = false;
             
             document.addEventListener('visibilitychange', async () => {
                 if (document.hidden) {