/* ========================================
   Neural Canvas - CSS Styles
   Modern, dark theme with glassmorphism
   ======================================== */

:root {
    /* Colors */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --bg-card: rgba(30, 30, 45, 0.6);
    --bg-glass: rgba(255, 255, 255, 0.03);

    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    --accent-glow: rgba(99, 102, 241, 0.3);

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;

    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);

    /* Spacing - Compact layout */
    --spacing-xs: 3px;
    --spacing-sm: 6px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    --spacing-2xl: 32px;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px var(--accent-glow);
}

/* ========================================
   Reset & Base
   ======================================== */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Background gradient animation */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse 80% 50% at 20% 40%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* ========================================
   Loading Overlay
   ======================================== */

.loading-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.loader-container {
    text-align: center;
}

.loader-ring {
    width: 60px;
    height: 60px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-lg);
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loader-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ========================================
   Error Overlay
   ======================================== */

.error-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9998;
}

.error-container {
    background: var(--bg-card);
    border: 1px solid var(--danger);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    max-width: 450px;
    backdrop-filter: blur(10px);
}

.error-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.error-container h2 {
    color: var(--danger);
    margin-bottom: var(--spacing-md);
}

.error-container ul {
    text-align: left;
    padding-left: var(--spacing-lg);
    color: var(--text-secondary);
}

.error-container li {
    margin-bottom: var(--spacing-xs);
}

/* ========================================
   App Container
   ======================================== */

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ========================================
   Header
   ======================================== */

.header {
    background: var(--bg-glass);
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1600px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 600;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.gpu-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--bg-tertiary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.backend-select {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.85rem;
    cursor: pointer;
    outline: none;
}

.backend-select:hover {
    border-color: var(--accent-primary);
}

.backend-select:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.gpu-icon {
    font-size: 1rem;
}

/* ========================================
   Tab Navigation
   ======================================== */

.tab-nav {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.tab-btn:hover {
    color: var(--text-primary);
    background: var(--bg-glass);
    border-color: var(--border-hover);
}

.tab-btn.active {
    color: var(--text-primary);
    background: var(--accent-gradient);
    border-color: transparent;
    box-shadow: var(--shadow-glow);
}

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

/* ========================================
   Main Content
   ======================================== */

.main-content {
    flex: 1;
    max-width: 1600px;
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.section-header h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* ========================================
   Upload Zones
   ======================================== */

.mosaic-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.upload-zone {
    background: var(--bg-card);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.upload-zone::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--accent-gradient);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.upload-zone:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.upload-zone:hover::before {
    opacity: 0.05;
}

.upload-zone.dragover {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.1);
}

.upload-zone.compact {
    padding: var(--spacing-lg);
}

.upload-content {
    position: relative;
    z-index: 1;
}

.upload-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.upload-zone h3 {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.upload-zone p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
}

.upload-zone input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.file-count {
    display: inline-block;
    background: var(--bg-tertiary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--accent-primary);
}

/* ========================================
   Parameters Panel
   ======================================== */

.params-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    backdrop-filter: blur(10px);
}

.params-panel.compact {
    margin-bottom: var(--spacing-lg);
}

.params-panel h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

.params-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.param-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.param-group label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.param-group input,
.param-group select {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    transition: all var(--transition-fast);
}

.param-group input:focus,
.param-group select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.param-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent-primary);
    cursor: pointer;
}

/* ========================================
   Buttons
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-normal);
}

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

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    border-color: var(--accent-primary);
    background: var(--bg-card);
}

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

.btn-danger:hover:not(:disabled) {
    background: #dc2626;
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
}

.action-bar {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-xl);
}

.action-buttons {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

/* ========================================
   Progress
   ======================================== */

.progress-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
}

.progress-label {
    color: var(--text-secondary);
}

.progress-percent {
    color: var(--accent-primary);
    font-weight: 600;
}

.progress-bar {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 4px;
    width: 0%;
    transition: width var(--transition-normal);
}

.progress-stats {
    text-align: center;
    margin-top: var(--spacing-sm);
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ========================================
   Preview Section
   ======================================== */

.preview-section {
    margin-bottom: var(--spacing-xl);
}

.preview-section h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--spacing-sm);
}

.preview-grid img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

/* ========================================
   Training Layout
   ======================================== */

.training-layout {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: var(--spacing-xl);
}

@media (max-width: 1024px) {
    .training-layout {
        grid-template-columns: 1fr;
    }
}

.control-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    backdrop-filter: blur(10px);
    height: fit-content;
}

.panel-section {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.panel-section:last-of-type {
    border-bottom: none;
    padding-bottom: 0;
}

.panel-section h3 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-md);
}

.dataset-info {
    margin-bottom: var(--spacing-md);
}

.info-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    padding: var(--spacing-xs) 0;
}

.info-row span:first-child {
    color: var(--text-secondary);
}

.info-row span:last-child {
    color: var(--accent-primary);
    font-weight: 500;
}

/* ========================================
   Metrics Panel
   ======================================== */

.metrics-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    backdrop-filter: blur(10px);
}

.metrics-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.metrics-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
}

.epoch-display {
    background: var(--bg-tertiary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.epoch-display span {
    color: var(--accent-primary);
    font-weight: 600;
}

.chart-container {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    height: 250px;
}

.chart-container canvas {
    width: 100% !important;
    height: 100% !important;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.stat-card {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-primary);
}

.sample-outputs h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
}

.sample-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

.sample-grid .sample-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2px;
    background: var(--border-color);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.sample-grid img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
}

/* ========================================
   Model IO Bar
   ======================================== */

.model-io-bar {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* ========================================
   Inference Layout
   ======================================== */

.inference-layout {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: var(--spacing-xl);
}

@media (max-width: 1024px) {
    .inference-layout {
        grid-template-columns: 1fr;
    }
}

.inference-input-panel {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.model-load-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: center;
}

.model-status {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.model-status.loaded {
    color: var(--success);
}

/* ========================================
   Comparison Panel
   ======================================== */

.comparison-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    backdrop-filter: blur(10px);
}

.comparison-header {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.compare-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.compare-btn:hover {
    border-color: var(--accent-primary);
}

.compare-btn.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

.comparison-view {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.comparison-placeholder {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.comparison-view img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.comparison-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    justify-content: center;
}

/* ========================================
   Footer
   ======================================== */

.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-md) var(--spacing-xl);
}

.footer-content {
    max-width: 1600px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.separator {
    opacity: 0.5;
}

/* ========================================
   Scrollbar
   ======================================== */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ========================================
   Utility Classes
   ======================================== */

.hidden {
    display: none !important;
}

.text-success {
    color: var(--success);
}

.text-warning {
    color: var(--warning);
}

.text-danger {
    color: var(--danger);
}

/* ========================================
   Training Preview
   ======================================== */

.training-preview {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.training-preview h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.training-preview h4 span {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: normal;
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.preview-item {
    text-align: center;
}

.preview-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.preview-item canvas {
    width: 100%;
    max-width: 128px;
    aspect-ratio: 1;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

/* Training Section on Main Page */
.training-section {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.training-stats {
    display: flex;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.stat-inline {
    display: flex;
    gap: var(--spacing-sm);
    font-size: 0.95rem;
}

.stat-inline span:first-child {
    color: var(--text-secondary);
}

.stat-inline span:last-child {
    color: var(--text-primary);
    font-weight: 600;
}

.training-preview-main {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;
}

.preview-item-main {
    text-align: center;
}

.preview-item-main canvas {
    width: 256px;
    height: 256px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.model-actions {
    margin-top: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

/* Training Stats Grid */
.training-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.stat-card-main {
    background: var(--bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
    border: 1px solid var(--border-color);
}

.stat-card-main .stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-xs);
}

.stat-value-main {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Chart Container for Main Page */
.chart-container-main {
    width: 100%;
    height: 250px;
    margin-bottom: var(--spacing-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    padding: var(--spacing-md);
    box-sizing: border-box;
}

.chart-container-main canvas {
    width: 100% !important;
    height: 100% !important;
}

/* Data Source Toggle */
.data-source-toggle {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    justify-content: center;
}

.source-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.source-btn:hover {
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.source-btn.active {
    background: var(--accent-gradient);
    border-color: transparent;
    color: white;
}

/* Synthetic Panel */
.synthetic-panel {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    border: 1px solid var(--border-color);
    text-align: center;
    max-width: 500px;
    margin: 0 auto var(--spacing-lg);
}

.synthetic-info h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.synthetic-info p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.synthetic-params {
    margin-bottom: var(--spacing-lg);
}

.synthetic-status {
    margin-top: var(--spacing-lg);
}

.synthetic-status .progress-bar {
    margin-bottom: var(--spacing-sm);
}

/* ========================================
   Mobile Responsive Styles
   ======================================== */

@media (max-width: 768px) {

    /* Prevent horizontal scrolling */
    html,
    body {
        overflow-x: hidden;
        max-width: 100vw;
    }

    /* App container */
    .app-container {
        overflow-x: hidden;
    }

    /* Main content */
    .main-content {
        padding: var(--spacing-md);
        max-width: 100%;
    }

    /* Header */
    .header .header-content {
        flex-direction: column;
        gap: var(--spacing-sm);
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .logo {
        font-size: 1rem;
    }

    .gpu-info {
        font-size: 0.8rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    /* Tab navigation */
    .tab-nav {
        overflow-x: auto;
        padding: var(--spacing-sm);
        gap: var(--spacing-xs);
    }

    .tab-btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.85rem;
        white-space: nowrap;
    }

    /* Panels */
    .panel,
    .card,
    .section-panel {
        padding: var(--spacing-md);
        max-width: 100%;
        overflow: hidden;
    }

    /* Upload zones */
    .upload-zone {
        padding: var(--spacing-md);
    }

    .upload-zones-row,
    .upload-grid,
    .two-column-layout {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    /* Form controls */
    input,
    select,
    textarea,
    button {
        max-width: 100%;
        font-size: 16px;
        /* Prevent iOS zoom */
    }

    /* Canvas containers - ensure no overflow */
    canvas {
        max-width: 100%;
        height: auto;
    }

    .canvas-container,
    .image-canvas-container,
    .preview-canvas {
        max-width: 100%;
        overflow: hidden;
    }

    /* Comparison view */
    .comparison-view,
    .comparison-container {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .comparison-view>div,
    .comparison-item {
        width: 100%;
        min-width: unset;
    }

    /* Image panels */
    .image-panel,
    .result-panel {
        min-width: unset;
        width: 100%;
    }

    /* Mosaic gallery */
    .mosaic-gallery {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }

    /* Buttons */
    .btn-group,
    .button-row {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    /* Charts */
    .chart-container {
        height: 200px;
        max-width: 100%;
    }

    /* Info tables */
    .info-table,
    .stats-table {
        font-size: 0.85rem;
    }

    /* Synthetic panel */
    .synthetic-panel {
        max-width: 100%;
        padding: var(--spacing-md);
    }

    /* Checkbox groups */
    .checkbox-group {
        flex-direction: column;
        align-items: flex-start;
    }

    /* Two-column layouts */
    .inference-layout,
    .training-layout {
        flex-direction: column;
    }

    .inference-layout>*,
    .training-layout>* {
        width: 100%;
        min-width: unset;
    }
}