:root {  
            --success-color: #28a745;
            --warning-color: #ffc107;
            --audio-color: #4a148c;
            --waveform-color: #e91e63;
        } .science-card {
    background: linear-gradient(145deg, #ffffff 0%, #f5f7fc 100%);
    border-radius: 24px;
    padding: 1.5rem;
}
.safety-note {
    background-color: #fff8e7;
    border-left: 4px solid #ffaa33;
    padding: 0.8rem 1rem;
    font-size: 0.9rem;
    border-radius: 8px;
    margin-top: 1rem;
}
        .slider-value {
            background-color: var(--primary-color);
            color: white;
            padding: 2px 8px;
            border-radius: 4px;
            font-weight: 600;
            margin-left: 10px;
        }
        .btn-success {
            background-color: var(--success-color);
            border-color: var(--success-color);
            font-weight: 600;
            padding: 0.75rem 1.5rem;
            border-radius: 6px;
            transition: all 0.3s;
        }
        .btn-danger {
            background-color: #dc3545;
            border-color: #dc3545;
            font-weight: 600;
            padding: 0.75rem 1.5rem;
            border-radius: 6px;
            transition: all 0.3s;
        }
        .audio-result {
            padding: 12px;
            background-color: white;
            border-radius: 4px;
            border: 1px solid #eee;
            font-size: 1.1rem;
            margin: 10px 0;
            text-align: center;
        }
        .audio-wave {
            font-size: 1.3rem;
            padding: 15px;
            background-color: rgba(156, 39, 176, 0.05);
            border-left: 4px solid var(--audio-color);
            border-radius: 4px;
            margin: 15px 0;
        }
        .waveform-container {
            position: relative;
            height: 100px;
            width: 100%;
            margin-bottom: 2rem;
            background-color: #f8f9fa;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            overflow: hidden;
        }
        .waveform-box {
            background-color: rgba(233, 30, 99, 0.05);
            border-left: 3px solid var(--waveform-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        @media (max-width: 768px) {
            }
        .frequency-examples {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin: 1rem 0;
        } 
        .audio-controls {
            display: flex;
            gap: 1rem;
            margin: 1.5rem 0;
            flex-wrap: wrap;
        }
        .waveform-selector {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .waveform-btn {
            flex: 1;
            padding: 0.75rem;
            border: 2px solid #ddd;
            border-radius: 6px;
            background-color: white;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s;
        }
        .waveform-btn:hover {
            background-color: rgba(156, 39, 176, 0.05);
        }
        .waveform-btn.active {
            border-color: var(--primary-color);
            background-color: rgb(6 71 126 / 10%);
            color: var(--primary-color);
        }
        .slider-container {
            margin: 1.5rem 0;
        }
        .slider-label {
            display: flex;
            justify-content: space-between;
            margin-bottom: 0.5rem;
        }
        .slider-value {
            font-weight: 600;
        }
        input[type="range"] {
            width: 100%;
            height: 8px;
            border-radius: 4px;
            background: #ddd;
            outline: none;
            -webkit-appearance: none;
        }
        input[type="range"]::-webkit-slider-thumb {
            -webkit-appearance: none;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--primary-color);
            cursor: pointer;
        }
        .audio-visualization {
            height: 150px;
            background-color: #f5f5f5;
            border-radius: 6px;
            margin: 1rem 0;
            position: relative;
            overflow: hidden;display:none
        }
        .visualization-wave {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
        }
        .preset-tones {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
            gap: 0.75rem;
            margin: 1.5rem 0;
        }
        .preset-tone {
            padding: 0.75rem;
            border: 1px solid #ddd;
            border-radius: 6px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s;
        }
        .preset-tone:hover {
            background-color: rgba(156, 39, 176, 0.1);
            border-color: var(--primary-color);
        }
        .preset-tone.active {
            background-color: rgba(156, 39, 176, 0.2);
            border-color: var(--primary-color);
            color: var(--primary-color);
            font-weight: 600;
        }
        .audio-status {
            display: flex;
            align-items: center;
            padding: 1rem;
            background-color: rgba(156, 39, 176, 0.05);
            border-radius: 6px;
            margin: 1rem 0;
        }
        .status-indicator {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background-color: #ddd;
            margin-right: 10px;
        }
        .status-indicator.active {
            background-color: var(--success-color);
            animation: pulse 1.5s infinite;
        }
        @keyframes pulse {
            0% { opacity: 1; }
            50% { opacity: 0.5; }
            100% { opacity: 1; }
        }
        .db-meter {
            height: 20px;
            background: linear-gradient(to right, #28a745, #ffc107, #dc3545);
            border-radius: 10px;
            margin: 1rem 0;
            position: relative;
        }
        .db-level {
            position: absolute;
            top: -5px;
            width: 10px;
            height: 30px;
            background-color: #333;
            border-radius: 2px;
            transform: translateX(-50%);
        }
        .hearing-test {
            background-color: rgba(156, 39, 176, 0.05);
            border-radius: 8px;
            padding: 1.5rem;
            margin: 1.5rem 0;
        }
        .calculations-container {
            background-color: white;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            padding: 1.5rem;
            margin-top: 1.5rem;
        }
        .calculation-item {
            display: flex;
            justify-content: space-between;
            padding: 0.75rem 0;
            border-bottom: 1px solid #eee;
        }
        .calculation-item:last-child {
            border-bottom: none;
        }
        .calculation-label {
            font-weight: 600;
            color: var(--text-color);
        }
        .calculation-value {
            font-family: 'Courier New', monospace;
            font-weight: 600;
            color: var(--primary-color);
        }
        .waveform-info {
            position: absolute;
            top: 15px;
            left: 15px;
            background-color: rgba(255, 255, 255, 0.9);
            padding: 10px 15px;
            border-radius: 6px;
            font-size: 0.9rem;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
            z-index: 10;
        }
        .waveform-info-item {
            margin: 3px 0;
        }