:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --success-color: #4caf50;
    --danger-color: #f44336;
    --warning-color: #ff9800;
    --dark-color: #333;
    --light-color: #f5f5f5;
    --border-radius: 12px;
    --transition: all 0.3s ease;
    --background-gradient: linear-gradient(135deg, #f5f7fa 0%, #e4e8ec 100%);
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.audio-recorder-section {
    padding: 20px 0;
    min-height: 100vh;
    background: var(--background-gradient);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 15px;
}

.calculator-header {
    text-align: center;
    margin-bottom: 30px;
    padding: 40px 20px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
}

.header-content {
    max-width: 600px;
    margin: 0 auto;
}

.calculator-title {
    font-size: 2.5rem;
    color: var(--dark-color);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.calculator-title i {
    color: var(--danger-color);
}

.calculator-subtitle {
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 20px;
}

.calculator-badge {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
}

.badge-item {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.85rem;
}

.recorder-main {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    padding: 30px;
    margin-bottom: 30px;
}

.section-title {
    font-size: 1.3rem;
    color: var(--dark-color);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-title i {
    color: var(--primary-color);
}

.audio-display {
    margin-bottom: 30px;
}

.waveform-container {
    background: #1a1a1a;
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 20px;
}

#waveform-canvas {
    width: 100%;
    height: 120px;
    background: #1a1a1a;
    border-radius: 10px;
}

.audio-info {
    display: flex;
    justify-content: space-between;
    margin-top: 15px;
}

.duration {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    font-family: monospace;
}

.status {
    font-size: 0.9rem;
    color: #666;
}

.status.recording {
    color: var(--danger-color);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.audio-controls {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
}

.control-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.control-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.start-btn {
    background: linear-gradient(135deg, var(--danger-color), #d32f2f);
    color: white;
}

.start-btn:hover:not(:disabled) {
    transform: scale(1.1);
    box-shadow: 0 5px 20px rgba(244, 67, 54, 0.4);
}

.pause-btn {
    background: linear-gradient(135deg, var(--warning-color), #f57c00);
    color: white;
}

.pause-btn:hover:not(:disabled) {
    transform: scale(1.1);
    box-shadow: 0 5px 20px rgba(255, 152, 0, 0.4);
}

.stop-btn {
    background: linear-gradient(135deg, #607d8b, #546e7a);
    color: white;
}

.stop-btn:hover:not(:disabled) {
    transform: scale(1.1);
    box-shadow: 0 5px 20px rgba(96, 125, 139, 0.4);
}

.play-btn {
    background: linear-gradient(135deg, var(--success-color), #388e3c);
    color: white;
}

.play-btn:hover:not(:disabled) {
    transform: scale(1.1);
    box-shadow: 0 5px 20px rgba(76, 175, 80, 0.4);
}

.volume-control {
    display: flex;
    align-items: center;
    gap: 15px;
    max-width: 300px;
    margin: 0 auto;
}

.volume-control label {
    font-weight: 500;
    color: var(--dark-color);
}

.volume-control input[type="range"] {
    flex: 1;
    height: 6px;
    -webkit-appearance: none;
    background: #ddd;
    border-radius: 3px;
    outline: none;
}

.volume-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    cursor: pointer;
}

#volume-value {
    width: 50px;
    text-align: right;
    color: var(--dark-color);
}

.settings-section {
    margin-bottom: 30px;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.setting-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.setting-item label {
    font-weight: 500;
    color: var(--dark-color);
}

.setting-item select {
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 1rem;
    background: white;
    cursor: pointer;
    transition: var(--transition);
}

.setting-item select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.recordings-section {
    margin-bottom: 20px;
}

.recordings-list {
    max-height: 300px;
    overflow-y: auto;
}

.no-recordings {
    text-align: center;
    color: #999;
    padding: 30px;
}

.recording-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 10px;
    margin-bottom: 10px;
}

.recording-item:last-child {
    margin-bottom: 0;
}

.recording-info {
    flex: 1;
}

.recording-name {
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 5px;
}

.recording-meta {
    font-size: 0.85rem;
    color: #666;
}

.recording-actions {
    display: flex;
    gap: 10px;
}

.recording-actions button {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.recording-actions button:hover {
    transform: scale(1.1);
}

.play-action {
    background: var(--success-color);
    color: white;
}

.download-action {
    background: var(--primary-color);
    color: white;
}

.delete-action {
    background: var(--danger-color);
    color: white;
}

.calculator-info {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    padding: 30px;
}

.info-section {
    margin-bottom: 25px;
}

.info-section:last-child {
    margin-bottom: 0;
}

.info-title {
    font-size: 1.3rem;
    color: var(--dark-color);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.info-title i {
    color: var(--primary-color);
}

.info-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.info-list li {
    padding: 10px 0;
    border-bottom: 1px solid #f0f0f0;
    color: #666;
    line-height: 1.6;
}

.info-list li:last-child {
    border-bottom: none;
}

@media (max-width: 768px) {
    .calculator-title {
        font-size: 1.8rem;
    }

    .calculator-header {
        padding: 25px 15px;
    }

    .recorder-main {
        padding: 20px 15px;
    }

    .audio-controls {
        gap: 15px;
    }

    .control-btn {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }

    .settings-grid {
        grid-template-columns: 1fr;
    }
}