.glass { background: rgba(255, 255, 255, 0.03); backdrop-filter: blur(10px); border: 1px solid rgba(255, 255, 255, 0.1); }
        
        @keyframes pulse-slow {
            0%, 100% { transform: scale(1); opacity: 1; }
            50% { transform: scale(1.05); opacity: 0.9; }
        }
        .music-playing { animation: pulse-slow 2s infinite ease-in-out; }

        /* Custom Range Slider Styling */
        input[type=range]::-webkit-slider-thumb {
            -webkit-appearance: none;
            height: 12px;
            width: 12px;
            border-radius: 99px;
            background: #ffffff;
            cursor: pointer;
            box-shadow: 0 0 10px rgba(255,255,255,0.5);
        }