完美

youtube_sub.js

@@ -722,6 +722,11 @@ GM_addStyle(`
                 return active[0].index;
             };
 
+            const clearAllHighlights = () => {
+                const words = this.container.querySelectorAll('.subtitle-word.active');
+                words.forEach(word => word.classList.remove('active'));
+            };
+
             const highlightWords = (currentTime, activeLine) => {
                 if (!activeLine) return;
 
@@ -775,6 +780,8 @@ GM_addStyle(`
                     rafId = requestAnimationFrame(() => handleTimeUpdate(video));
                     return;
                 }
+                // Clear all highlights when switching lines
+                clearAllHighlights();
 
                 const lines = this.container.querySelectorAll('.subtitle-line');
                 lines.forEach(line => {