:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --accent-color: #06b6d4;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --background: #f8fafc;
    --surface: #ffffff;
    --surface-hover: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --border-hover: #cbd5e1;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.copyright-footer {
    background: var(--text-primary);
    color: white;
    text-align: center;
    padding: 1rem 0;
    margin-top: 2rem;
}

.copyright-footer p {
    margin: 0;
    font-size: 0.9rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header Styles */
.header {
    background: var(--gradient);
    color: white;
    padding: 3rem 0;
    margin-bottom: 3rem;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 20"><defs><radialGradient id="a" cx="50%" cy="0%" r="50%"><stop offset="0%" stop-color="%23fff" stop-opacity="0.1"/><stop offset="100%" stop-color="%23fff" stop-opacity="0"/></radialGradient></defs><rect width="100" height="20" fill="url(%23a)"/></svg>');
    opacity: 0.3;
}

.header-content {
    text-align: center;
    position: relative;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.logo i {
    font-size: 3rem;
    opacity: 0.9;
}

.logo h1 {
    font-size: 3.75rem;
    font-weight: 700;
    letter-spacing: -0.025em;
}

.subtitle {
    font-size: 1.125rem;
    opacity: 0.9;
    font-weight: 300;
    max-width: 600px;
    margin: 0 auto;
}

/* Main Content */
.main {
    position: relative;
    z-index: 1;
}

/* Upload Section */
.upload-section {
    margin-bottom: 3rem;
}

.upload-card {
    background: var(--surface);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
}

.upload-card:hover {
    box-shadow: var(--shadow-lg);
}

.upload-area {
    padding: 3rem;
    border: 2px dashed var(--border);
    border-radius: var(--border-radius);
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: linear-gradient(135deg, #fafbfc 0%, #f8fafc 100%);
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
}

.upload-area.dragover {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
    transform: scale(1.02);
}

.upload-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    display: block;
}

.upload-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.upload-content p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.supported-formats {
    font-size: 0.875rem;
    color: var(--text-secondary);
    background: var(--surface);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    display: inline-block;
    line-height: 1.4;
}

.quality-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.quality-link:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* Image Preview */
.image-preview {
    padding: 2rem;
    text-align: center;
}

.image-preview img {
    max-width: 100%;
    max-height: 400px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

.image-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    font-family: inherit;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background: #475569;
    transform: translateY(-2px);
}

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

/* Results Section */
.results-section {
    margin-bottom: 3rem;
}

.results-card {
    background: var(--surface);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.results-header {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.results-header i {
    font-size: 1.25rem;
}

.results-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.results-content {
    padding: 2rem;
}

.prediction-main {
    text-align: center;
    margin-bottom: 2rem;
}

.prediction-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.prediction-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.confidence-section {
    margin-bottom: 2rem;
}

.confidence-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.confidence-bar {
    position: relative;
    height: 12px;
    background: var(--border);
    border-radius: 6px;
    overflow: hidden;
}

.confidence-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--success-color) 0%, var(--accent-color) 100%);
    border-radius: 6px;
    transition: width 1s ease-out;
    position: relative;
}

.confidence-text {
    position: absolute;
    right: 0;
    top: -30px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

.disclaimer {
    background: #fef3c7;
    border: 1px solid #fcd34d;
    border-radius: 8px;
    padding: 1rem;
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
}

.disclaimer i {
    color: var(--warning-color);
    margin-top: 0.125rem;
    flex-shrink: 0;
}

.disclaimer p {
    font-size: 0.875rem;
    color: #92400e;
    margin: 0;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.loading-spinner {
    text-align: center;
    color: white;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

/* Info Section */
.info-section {
    margin-bottom: 3rem;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.info-card {
    background: var(--surface);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.info-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.info-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.info-card h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.info-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* Lesion Types Section */
.lesion-types {
    background: var(--surface);
    padding: 3rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 3rem;
}

.lesion-types h3 {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.lesion-types-results {
    background: var(--surface);
    padding: 3rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 3rem;
    margin-top: 2rem;
}

.lesion-types-results h3 {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.types-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.type-card {
    background: var(--surface-hover);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
    transition: var(--transition);
}

.type-card:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow);
}

.type-card h5 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.type-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Mobile Device Detection and Optimization */
.mobile-optimized {
    /* Applied via JavaScript for mobile devices */
}

/* Touch-friendly interactions */
@media (hover: none) and (pointer: coarse) {
    /* Touch devices - larger tap targets */
    .btn {
        min-height: 48px;
        padding: 1rem 1.5rem;
    }
    
    .faq-question {
        padding: 1.5rem 0;
        min-height: 48px;
    }
    
    .type-card,
    .info-card,
    .progress-card {
        padding: 1.5rem;
        min-height: 120px;
    }
    
    .upload-area {
        padding: 3rem 1.5rem;
        min-height: 200px;
    }
}

/* Responsive Design - Mobile First */
@media (max-width: 480px) {
    .container {
        padding: 0 0.75rem;
    }
    
    .header {
        padding: 1.5rem 0;
        margin-bottom: 1.5rem;
    }
    
    .logo {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .logo h1 {
        font-size: 2.625rem;
        text-align: center;
    }
    
    .logo i {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 0.9rem;
        text-align: center;
        padding: 0 0.5rem;
    }
    
    .upload-area {
        padding: 1.5rem 1rem;
        margin: 0.5rem 0;
    }
    
    .upload-content h3 {
        font-size: 1.125rem;
    }
    
    .upload-content p {
        font-size: 0.875rem;
    }
    
    .supported-formats {
        font-size: 0.75rem;
    }
    
    .image-actions {
        flex-direction: column;
        gap: 0.75rem;
        width: 100%;
    }
    
    .btn {
        width: 100%;
        min-height: 48px;
        font-size: 0.9rem;
        justify-content: center;
    }
    
    .results-content {
        padding: 1rem;
    }
    
    .prediction-value {
        font-size: 1.25rem;
    }
    
    .confidence-text {
        font-size: 0.8rem;
    }
    
    .info-grid,
    .types-grid,
    .progress-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .info-card,
    .type-card,
    .progress-card {
        padding: 1.25rem;
        text-align: left;
    }
    
    .info-card i {
        font-size: 2rem;
        margin-bottom: 0.75rem;
    }
    
    .info-card h4,
    .type-card h5,
    .progress-card h5 {
        font-size: 1rem;
        margin-bottom: 0.5rem;
    }
    
    .info-card p,
    .type-card p,
    .progress-card p {
        font-size: 0.85rem;
        line-height: 1.4;
    }
    
    .lesion-types,
    .lesion-types-results,
    .training-progress,
    .faq-section,
    .medical-disclaimer {
        padding: 1.5rem 0.75rem;
        margin-bottom: 2rem;
    }
    
    .lesion-types h3,
    .training-progress h3,
    .faq-section h3 {
        font-size: 1.5rem;
        margin-bottom: 1.5rem;
    }
    
    .faq-question {
        padding: 1rem 0;
        flex-direction: row;
        align-items: flex-start;
    }
    
    .faq-question h5 {
        font-size: 0.95rem;
        line-height: 1.3;
        margin-right: 1rem;
    }
    
    .faq-answer p {
        font-size: 0.85rem;
        line-height: 1.4;
    }
    
    .sample-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .sample-image {
        max-width: 150px;
        height: 120px;
    }
    
    .disclaimer-header {
        flex-direction: column;
        text-align: center;
        gap: 0.5rem;
    }
    
    .disclaimer-header h3 {
        font-size: 1.25rem;
    }
    
    .disclaimer-text p,
    .disclaimer-text li {
        font-size: 0.8rem;
        line-height: 1.4;
    }
    
    .disclaimer-text li {
        padding: 0.75rem;
        margin-bottom: 0.5rem;
    }
}

/* Tablet Portrait */
@media (min-width: 481px) and (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    .header {
        padding: 2rem 0;
        margin-bottom: 2rem;
    }
    
    .logo h1 {
        font-size: 3rem;
    }
    
    .logo i {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .upload-area {
        padding: 2rem 1rem;
    }
    
    .image-actions {
        flex-direction: row;
        gap: 1rem;
        justify-content: center;
    }
    
    .btn {
        min-width: 150px;
        min-height: 44px;
    }
    
    .info-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .types-grid,
    .progress-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .lesion-types,
    .lesion-types-results,
    .training-progress,
    .faq-section,
    .medical-disclaimer {
        padding: 2rem 1rem;
    }
    
    .results-content {
        padding: 1.5rem;
    }
    
    .prediction-value {
        font-size: 1.5rem;
    }
    
    .sample-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Large Mobile/Small Tablet Landscape */
@media (min-width: 769px) and (max-width: 1024px) {
    .info-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .types-grid,
    .progress-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* High DPI Displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .accuracy-chart,
    .sample-image {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

/* iOS Specific Optimizations */
.ios-device {
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}

.ios-device .btn {
    -webkit-appearance: none;
    border-radius: 8px;
}

.ios-device .upload-area {
    -webkit-touch-callout: none;
    -webkit-user-select: none;
}

/* Android Specific Optimizations */
.android-device {
    text-size-adjust: 100%;
}

.android-device .btn {
    border-radius: 6px;
}

/* Mobile-specific styles */
.mobile-optimized .upload-content {
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

.mobile-optimized .btn:active {
    transform: translateY(1px);
    box-shadow: var(--shadow-sm);
}

.mobile-optimized .faq-question:active,
.mobile-optimized .type-card:active,
.mobile-optimized .info-card:active {
    background: var(--surface-hover);
}

/* Improved mobile upload area */
@media (max-width: 480px) {
    .mobile-optimized .upload-icon {
        font-size: 2.5rem;
        margin-bottom: 0.75rem;
    }
    
    .mobile-optimized .upload-content h3 {
        font-size: 1.25rem;
        margin-bottom: 0.75rem;
    }
    
    .mobile-optimized .upload-content p {
        font-size: 0.9rem;
        margin-bottom: 1rem;
    }
}

/* Animation for result appearance */
@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.results-section.show {
    animation: slideUp 0.6s ease-out;
}

/* Focus styles for accessibility */
.btn:focus,
.upload-area:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

input[type="file"]:focus + .upload-area {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Feedback Form Section */
.feedback-form-section {
    margin-bottom: 3rem;
}

.feedback-form-card {
    background: var(--surface);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
}

.feedback-form-header {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    color: white;
    padding: 1.5rem;
    text-align: center;
}

.feedback-form-header i {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    display: block;
}

.feedback-form-header h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
}

.feedback-form-content {
    padding: 2rem;
}

.feedback-form-content > p {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1rem;
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-family: inherit;
    font-size: 0.875rem;
    transition: var(--transition);
    background: var(--surface);
    color: var(--text-primary);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-secondary);
}

.form-group select {
    cursor: pointer;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-actions {
    text-align: center;
    margin-top: 2rem;
}

.form-actions .btn {
    min-width: 160px;
    padding: 0.875rem 1.5rem;
    font-size: 0.875rem;
}

.feedback-success {
    text-align: center;
    animation: fadeIn 0.5s ease-in;
}

.success-message {
    padding: 2rem;
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
    border-radius: var(--border-radius);
    border: 1px solid #10b981;
}

.success-message i {
    font-size: 3rem;
    color: var(--success-color);
    margin-bottom: 1rem;
}

.success-message h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.success-message p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}


/* Training Progress Section */
.training-progress {
    background: var(--surface);
    padding: 3rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 3rem;
}

.training-progress h3 {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.progress-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.progress-card {
    background: var(--surface-hover);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
    transition: var(--transition);
}

.progress-card:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow);
}

.progress-card h5 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.progress-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.training-chart {
    margin-top: 1rem;
    text-align: center;
}

.accuracy-chart {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.accuracy-chart:hover {
    box-shadow: var(--shadow);
    transform: scale(1.02);
}

/* Sample Images Section */
.sample-images {
    margin-top: 1.5rem;
    padding: 1rem;
    background: var(--surface-hover);
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

.sample-images h6 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.sample-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

.sample-item {
    background: var(--surface);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.sample-item:hover {
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}

.sample-image {
    width: 100%;
    max-width: 200px;
    height: 150px;
    object-fit: cover;
    border-radius: 6px;
    margin-bottom: 0.5rem;
    border: 2px solid var(--border);
}

.sample-label {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.sample-label.good {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #10b981;
}

.sample-description {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.4;
}

/* FAQ Section */
.faq-section {
    background: var(--surface);
    padding: 3rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 3rem;
}

.faq-section h3 {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

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

.faq-item {
    border-bottom: 1px solid var(--border);
    margin-bottom: 1rem;
}

.faq-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0;
    cursor: pointer;
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--primary-color);
}

.faq-question h5 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    transition: var(--transition);
}

.faq-question:hover h5 {
    color: var(--primary-color);
}

.faq-question i {
    font-size: 1rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
    color: var(--primary-color);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding 0.3s ease-out;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding-bottom: 1.5rem;
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

.collaboration-list {
    list-style: none;
    padding: 0;
    margin: 1rem 0;
}

.collaboration-list li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    line-height: 1.6;
    border-left: 3px solid var(--primary-color);
    padding-left: 1rem;
    margin-bottom: 0.5rem;
    background: var(--surface-hover);
    border-radius: 4px;
}

/* Medical Disclaimer Section */
.medical-disclaimer {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    border: 2px solid #fca5a5;
    border-radius: var(--border-radius);
    margin-bottom: 3rem;
    box-shadow: var(--shadow);
}

.disclaimer-content {
    padding: 2rem;
}

.disclaimer-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.disclaimer-header i {
    font-size: 2rem;
    color: var(--error-color);
}

.disclaimer-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #991b1b;
    margin: 0;
}

.disclaimer-text p {
    color: #7f1d1d;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.disclaimer-text p:first-of-type {
    font-size: 1.125rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 1.5rem;
}

.disclaimer-text ul {
    list-style: none;
    padding: 0;
    margin-bottom: 1.5rem;
}

.disclaimer-text li {
    background: rgba(239, 68, 68, 0.1);
    padding: 1rem;
    margin-bottom: 0.75rem;
    border-radius: 8px;
    border-left: 4px solid var(--error-color);
    color: #7f1d1d;
}

.disclaimer-text li strong {
    color: #991b1b;
}

.disclaimer-text p:last-child {
    font-weight: 600;
    text-align: center;
    font-size: 1.125rem;
    margin-bottom: 0;
    padding: 1rem;
    background: rgba(239, 68, 68, 0.1);
    border-radius: 8px;
}

/* Image Quality Guidelines Section */
.image-quality-section {
    background: var(--surface);
    padding: 3rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 3rem;
}

.image-quality-section h3 {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.quality-content {
    max-width: 1000px;
    margin: 0 auto;
}

.quality-instructions {
    margin-bottom: 3rem;
}

.quality-instructions h4 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    text-align: center;
}

.instruction-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.instruction-card {
    background: var(--surface-hover);
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
    border-left: 4px solid var(--primary-color);
    transition: var(--transition);
}

.instruction-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.instruction-card i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.instruction-card h5 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.instruction-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.quality-samples {
    margin-bottom: 3rem;
}

.quality-samples h4 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    text-align: center;
}

.quality-tips {
    background: var(--surface-hover);
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

.quality-tips h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

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

.tips-list li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
    line-height: 1.6;
}

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

.tips-list li strong {
    color: var(--text-primary);
}

/* Responsive adjustments for new sections */
@media (max-width: 768px) {
    .training-progress,
    .faq-section,
    .medical-disclaimer,
    .image-quality-section {
        padding: 2rem 1rem;
    }
    
    .training-progress h3,
    .faq-section h3 {
        font-size: 1.5rem;
    }
    
    .progress-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .disclaimer-header {
        flex-direction: column;
        text-align: center;
    }
    
    .disclaimer-header i {
        font-size: 2.5rem;
    }
}

@media (max-width: 480px) {
    .training-progress,
    .faq-section,
    .medical-disclaimer,
    .image-quality-section,
    .feedback-form-section {
        padding: 1.5rem 1rem;
    }
    
    .instruction-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .instruction-card {
        padding: 1.25rem;
    }
    
    .quality-tips {
        padding: 1.5rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }
    
    .feedback-form-content {
        padding: 1.5rem;
    }
    
    .feedback-form-header {
        padding: 1.25rem;
    }
    
    .success-message {
        padding: 1.5rem;
    }
    
    .faq-question {
        padding: 1rem 0;
    }
    
    .disclaimer-text li {
        padding: 0.75rem;
    }
}