@charset "UTF-8";

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--font-color);
    padding-top: 40px; /* Space for fixed header */
}

.main-container {
    max-width: 1000px;
    margin: 20px auto;
    padding: 0 20px;
}

.binaural-container {
    background: var(--content-bg-color);
    border-radius: 15px;
    padding: 0 30px 30px 30px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
    margin-bottom: 30px;
    border: 1px solid var(--border-color);
}

/* Page Header */
.page-header {
    text-align: center;
    margin-bottom: 30px;
}

.page-header h1 {
    color: var(--font-color);
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.page-header p {
    color: var(--font-color);
    font-size: 1.1rem;
    opacity: 0.8;
    margin: 0;
}

/* Privacy Notice */
.privacy-notice {
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #e8f5e8 0%, #f0f8f0 100%);
    border-left: 4px solid #4CAF50;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 30px;
    gap: 15px;
}

.privacy-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.privacy-title {
    color: #2e7d32;
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0 0 5px 0;
}

.privacy-description {
    color: #4a7c4a;
    font-size: 0.95rem;
    margin: 0;
}

/* Controls Section */
.controls-section {
    margin-bottom: 30px;
    padding: 10px 25px 25px 25px;
    background: var(--alt-content-bg-color);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.controls-section h3 {
    color: var(--font-color);
    margin-bottom: 20px;
    font-size: 1.3rem;
    font-weight: 600;
    text-align: center;
}

.controls-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.control-group label {
    font-weight: 600;
    color: var(--font-color);
    font-size: 1rem;
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 15px;
}

.slider-container input[type="range"] {
    flex: 1;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

.slider-container input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: #4CAF50;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
}

.slider-container input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 0 10px rgba(76, 175, 80, 0.5);
}

.slider-container input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: #4CAF50;
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

.slider-value {
    font-weight: 600;
    color: var(--font-color);
    min-width: 70px;
    text-align: right;
    font-family: 'Courier New', monospace;
}

.preset-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 8px;
}

.preset-btn {
    padding: 6px 12px;
    background: var(--content-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--font-color);
}

.preset-btn:hover {
    background: #4CAF50;
    color: white;
    transform: translateY(-1px);
}

.frequency-info {
    text-align: center;
    margin-top: 5px;
}

.frequency-info span {
    background: linear-gradient(135deg, #4CAF50, #45a049);
    color: white;
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 600;
}

/* Presets Section */
.presets-section {
    margin-bottom: 30px;
    padding: 10px 25px 25px 25px;
    background: var(--alt-content-bg-color);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.presets-section h3 {
    color: var(--font-color);
    margin-bottom: 20px;
    font-size: 1.3rem;
    font-weight: 600;
    text-align: center;
}

.preset-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.preset-pattern-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 15px;
    background: var(--content-bg-color);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    gap: 8px;
}

.preset-pattern-btn:hover {
    border-color: #4CAF50;
    background: rgba(76, 175, 80, 0.1);
    transform: translateY(-2px);
}

.preset-pattern-btn.active {
    border-color: #4CAF50;
    background: rgba(76, 175, 80, 0.15);
}

.preset-icon {
    font-size: 2rem;
}

.preset-name {
    font-weight: 600;
    color: var(--font-color);
    font-size: 1rem;
}

.preset-desc {
    font-size: 0.8rem;
    color: var(--font-color);
    opacity: 0.7;
}

/* Playback Section */
.playback-section {
    margin-bottom: 30px;
    padding: 10px 25px 20px 25px;
    background: var(--alt-content-bg-color);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.playback-section h3 {
    color: var(--font-color);
    margin-bottom: 20px;
    font-size: 1.3rem;
    font-weight: 600;
    text-align: center;
}

.player-controls {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 25px;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-primary {
    background: #4CAF50;
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: #45a049;
    transform: translateY(-2px);
}

.btn-secondary {
    background: #2196F3;
    color: white;
}

.btn-secondary:hover:not(:disabled) {
    background: #1976D2;
    transform: translateY(-2px);
}

.btn-danger {
    background: #f44336;
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background: #d32f2f;
    transform: translateY(-2px);
}

.btn-export {
    background: #FF9800;
    color: white;
}

.btn-export:hover:not(:disabled) {
    background: #F57C00;
    transform: translateY(-2px);
}

.btn-success {
    background: #28a745;
    color: white;
}

.btn-success:hover:not(:disabled) {
    background: #218838;
    transform: translateY(-2px);
}

.btn-icon {
    font-size: 1.1rem;
}

/* Progress Container */
.progress-container {
    margin-bottom: 20px;
}

.time-display {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 5px;
    margin-bottom: 10px;
    font-family: 'Courier New', monospace;
    font-weight: 600;
    color: var(--font-color);
}

.time-separator {
    opacity: 0.7;
}

.progress-bar {
    position: relative;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    cursor: pointer;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #4CAF50, #45a049);
    border-radius: 4px;
    width: 0%;
    transition: width 0.1s ease;
}

.progress-handle {
    position: absolute;
    top: 50%;
    width: 16px;
    height: 16px;
    background: #4CAF50;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    cursor: pointer;
    left: 0%;
    transition: left 0.1s ease;
}

.progress-handle:hover {
    transform: translate(-50%, -50%) scale(1.1);
}

/* Visualization */
.canvas-container {
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 15px;
    background: #ffffff;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.05);
    overflow: hidden;
    width: 100%;
}

#visualizationCanvas {
    width: 100%;
    height: 200px;
    display: block;
    background: #ffffff;
    border-radius: 5px;
    max-width: 100%;
    min-width: 300px;
}

/* Export Section */
.export-section {
    margin-bottom: 30px;
    padding: 10px 25px 25px 25px;
    background: var(--alt-content-bg-color);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.export-section h3 {
    color: var(--font-color);
    margin-bottom: 10px;
    font-size: 1.3rem;
    font-weight: 600;
    text-align: center;
}

.export-section p {
    text-align: center;
    margin-bottom: 20px;
}

.export-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.export-description {
    text-align: center;
    color: var(--font-color);
    opacity: 0.8;
    margin-bottom: 25px;
}

.export-controls {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.format-selection {
    text-align: center;
}

.format-selection label {
    font-weight: 600;
    color: var(--font-color);
    margin-bottom: 15px;
    display: block;
}

.format-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.format-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 15px 20px;
    background: var(--alt-content-bg-color);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 120px;
}

.format-option:hover {
    border-color: #4CAF50;
    background: rgba(76, 175, 80, 0.1);
}

.format-option input[type="radio"] {
    display: none;
}

.format-option input[type="radio"]:checked + .format-label {
    color: #4CAF50;
    font-weight: 700;
}

.format-option:has(input[type="radio"]:checked) {
    border-color: #4CAF50;
    background: rgba(76, 175, 80, 0.15);
}

.format-label {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--font-color);
    margin-bottom: 4px;
}

.format-desc {
    font-size: 0.8rem;
    color: var(--font-color);
    opacity: 0.7;
    text-align: center;
}

.export-actions {
    display: flex;
    justify-content: center;
    gap: 15px;
}

/* Export Progress */
.export-progress {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    padding: 20px;
    background: var(--alt-content-bg-color);
    border-radius: 8px;
    margin-top: 20px;
}

.progress-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top: 4px solid #4CAF50;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.progress-text {
    text-align: center;
    color: var(--font-color);
}

.progress-text span {
    display: block;
    margin-bottom: 5px;
}

#progressPercent {
    font-weight: 600;
    color: #4CAF50;
}

/* Information Section */
.info-section {
    padding: 10px 25px 25px 25px;
    background: var(--alt-content-bg-color);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.info-section h3 {
    color: var(--font-color);
    margin-bottom: 20px;
    font-size: 1.3rem;
    font-weight: 600;
    text-align: center;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.info-card {
    background: var(--content-bg-color);
    padding: 20px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.info-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.info-card h4 {
    color: var(--font-color);
    margin-bottom: 10px;
    font-size: 1.1rem;
    font-weight: 600;
}

.info-card p {
    color: var(--font-color);
    opacity: 0.8;
    line-height: 1.5;
    margin: 0;
}

/* Dark Mode Adaptations */
@media (prefers-color-scheme: dark) {
    
    .frequency-info span {
        background: linear-gradient(135deg, #4a7c4a, #3a6c3a);
    }
}

/* Mobile Responsive Design */
@media (max-width: 768px) {
    .main-container {
        padding: 0 15px;
        margin: 15px auto;
    }
    
    .binaural-container {
        padding: 20px 15px;
    }
    
    .page-header h1 {
        font-size: 2rem;
    }
    
    .controls-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .preset-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 12px;
    }
    
    .preset-pattern-btn {
        padding: 15px 10px;
    }
    
    .player-controls {
        flex-direction: column;
        align-items: center;
        gap: 12px;
    }
    
    .btn {
        width: 100%;
        max-width: 200px;
        justify-content: center;
    }
    
    .format-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .format-option {
        width: 100%;
        max-width: 250px;
    }
    
    .export-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .controls-section,
    .presets-section,
    .playback-section,
    .export-section,
    .info-section {
        padding: 10px 15px 20px 15px;
    }
    
    #visualizationCanvas {
        height: 150px;
        min-width: 280px;
    }
    
    .export-buttons {
        flex-direction: row;
        justify-content: center;
        gap: 10px;
    }
    
    .btn-export {
        flex: 1;
        min-width: 100px;
        max-width: 150px;
    }
}

@media (max-width: 480px) {
    .page-header h1 {
        font-size: 1.8rem;
    }
    
    .preset-grid {
        grid-template-columns: 1fr;
    }
    
    .preset-buttons {
        justify-content: center;
    }
    
    .slider-container {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
    }
    
    .slider-value {
        text-align: center;
        min-width: auto;
    }
    
    .controls-section,
    .presets-section,
    .playback-section,
    .export-section,
    .info-section {
        padding: 10px 15px 20px 15px;
    }
    
    #visualizationCanvas {
        height: 120px;
        min-width: 260px;
    }
    
    .export-buttons {
        flex-direction: column;
        align-items: center;
        gap: 10px;
    }
    
    .btn-export {
        width: 100%;
        max-width: 200px;
        flex: none;
    }
}

/* Focus and Accessibility */
.btn:focus,
.preset-btn:focus,
.preset-pattern-btn:focus,
.format-option:focus {
    outline: 2px solid #4CAF50;
    outline-offset: 2px;
}

input[type="range"]:focus {
    outline: 2px solid #4CAF50;
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .btn,
    .preset-btn,
    .preset-pattern-btn,
    .format-option {
        border-width: 2px;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .btn:hover,
    .preset-btn:hover,
    .preset-pattern-btn:hover,
    .info-card:hover {
        transform: none;
    }
}