        opacity: 0.5;
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }

        .control-btn.stop {
            background: linear-gradient(135deg, rgba(255, 107, 107, 0.3), rgba(200, 80, 80, 0.2));
            border: 1px solid rgba(255, 107, 107, 0.5);
        }

        .control-btn.stop:hover {
            background: linear-gradient(135deg, rgba(255, 107, 107, 0.5), rgba(200, 80, 80, 0.4));
            box-shadow: 0 8px 20px rgba(255, 107, 107, 0.4);