.waveform-canvas {
            width: 100%;
            max-width: 700px;
            height: auto;
            background-color: #fefefe;
            border: 1px solid #ccc;
            border-radius: 8px;
            margin-top: 1rem;
            display: block;
            box-shadow: 0 2px 6px rgba(0,0,0,0.05);
        }
        .mode-selector {
            margin-bottom: 1.5rem;
            border-bottom: 1px solid #e0e0e0;
            padding-bottom: 0.75rem;
        }
        .mode-btn {
            margin-right: 1rem;
        }
        .input-group-custom {
            margin-bottom: 1rem;
        }
        .legend {
            display: flex;
            justify-content: center;
            gap: 1.5rem;
            margin-top: 0.5rem;
            font-size: 0.8rem;
        }
        .legend-color {
            width: 16px;
            height: 16px;
            display: inline-block;
            border-radius: 2px;
            margin-right: 4px;
        }
        .legend-color.wave-high { background-color: #2c7da0; }
        .legend-color.wave-low { background-color: #a9d6e5; }
        .legend-color.trigger { background-color: #e9c46a; }
        .card-tool {
            background: #fff;
            border-radius: 16px;
            padding: 1.2rem;
            box-shadow: 0 4px 12px rgba(0,0,0,0.05);
        }