', startMusicOnClick);
                }, { once: true });
            });
        }
        
        function playNextTrack() {
            if (!ENABLE_BACKGROUND_MUSIC) return;
            
            const audio = document.getElementById('background-music');
            if (!audio) return;
            
            currentTrackIndex = (currentTrackIndex + 1) % musicPlaylist.length;
            const nextTrack = musicPlaylist[currentTrackIndex];
            
            // Update audio source
            