 });
                
                this.audio.addEventListener('pause', () => {
                    this.isPlaying = false;
                    this.updateUI();
                });
            }
            
            setupUI() {
                const playBtn = document.getElementById('play-btn');
                const pauseBtn = document.getElementById('pause-btn');
                const volumeSlider = document.getElementById('volume-slider');
                
                playBtn.addEventListener(