:root {
    /* Modern Color Palette - Image Overlay Theme */
    --color-text: #2c3e50;
    --color-background: #f5f7fa;
    --color-surface: #ffffff;
    --color-primary: #9b59b6;
    --color-primary-hover: #8e44ad;
    --color-success: #27ae60;
    --color-success-hover: #229954;
    --color-warning: #f39c12;
    --color-warning-hover: #d35400;
    --color-danger: #e74c3c;
    --color-danger-hover: #c0392b;
    --color-secondary: #7f8c8d;
    --color-secondary-hover: #707b7c;
    --color-border: #dfe6e9;
    --color-muted: #95a5a6;
    --color-header-bg: #9b59b6;
    --color-header-text: #ffffff;
    --color-code-bg: #ecf0f1;
    --color-highlight: #16a085;

    /* Typography */
    --font-family-sans-serif: 'Inter', sans-serif;
    --font-size-base: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-sm: 0.875rem;
    --font-size-h1: 2rem;
    --font-size-h2: 1.5rem;
    --font-weight-normal: 400;
    --font-weight-bold: 700;
    --line-height-base: 1.6;

    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 1rem;
    --spacing-4: 1.5rem;
    --spacing-5: 2rem;

    /* Borders */
    --border-width: 1px;
    --border-radius: 0.375rem;
    --border-radius-sm: 0.25rem;
}

* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-family-sans-serif);
    line-height: var(--line-height-base);
    margin: 0;
    padding: 0;
    background-color: var(--color-background);
    color: var(--color-text);
}

/* --- Header --- */
header {
    background: var(--color-header-bg);
    padding: var(--spacing-3) var(--spacing-5);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-4);
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.header-center {
    flex: 1;
    text-align: center;
}

.header-right {
    display: flex;
    align-items: center;
}

#header-logo {
    max-height: 60px;
    width: auto;
}

.header-logo-link {
    text-decoration: none;
    border: none;
    outline: none;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.header-logo-link:hover {
    transform: scale(1.05);
    opacity: 0.8;
}

.header-logo-link:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.header-text {
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: var(--font-size-h1);
    color: var(--color-header-text);
}

header p {
    margin: var(--spacing-1) 0 0 0;
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.9);
}

.theme-toggle-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: var(--border-radius);
    padding: var(--spacing-2);
    cursor: pointer;
    transition: background-color 0.2s ease;
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.theme-toggle-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.theme-icon-dark {
    display: none;
}

body.dark-mode .theme-icon-light {
    display: none;
}

body.dark-mode .theme-icon-dark {
    display: inline;
}

/* --- Layers Panel --- */
.layers-panel {
    background: var(--color-surface);
    border-radius: var(--border-radius);
    padding: var(--spacing-3);
    margin-bottom: var(--spacing-4);
    border: 1px solid var(--color-border);
}

.layers-panel h3 {
    margin: 0;
    color: var(--color-text);
    font-size: var(--font-size-lg);
}

.layers-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-3);
}

.layers-hint {
    font-size: var(--font-size-sm);
    color: var(--color-muted);
    font-style: italic;
    opacity: 0.8;
}

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

.layer-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2);
    background: var(--color-background);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-2);
    transition: background-color 0.2s ease;
}

.layer-item-draggable {
    cursor: grab;
}

.layer-item-draggable:active {
    cursor: grabbing;
}

.drag-handle {
    cursor: grab;
    font-size: 1.2rem;
    color: var(--color-muted);
    padding: 2px;
    -webkit-user-select: none;
    user-select: none;
}

.drag-handle:active {
    cursor: grabbing;
}

.layer-item.dragging {
    opacity: 0.5;
    transform: scale(0.95);
}

.layer-item.drag-over {
    background: rgba(155, 89, 182, 0.1);
    border: 2px dashed #9b59b6;
}

.layer-item:hover {
    background: rgba(155, 89, 182, 0.05);
}

.layer-item input[type="checkbox"] {
    margin: 0;
    cursor: pointer;
}

.layer-thumbnail {
    width: 40px;
    height: 40px;
    object-fit: cover;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--color-border);
}

.layer-name {
    flex: 1;
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
}

.layer-info {
    color: var(--color-muted);
    font-size: var(--font-size-sm);
}

.layer-opacity-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-1);
    margin-left: auto;
}

.layer-opacity-label {
    font-size: 0.9rem;
    color: var(--color-muted);
    cursor: help;
}

.layer-opacity-slider {
    width: 60px;
    height: 4px;
    background: var(--color-border);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
}

.layer-opacity-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 12px;
    height: 12px;
    background: var(--color-primary);
    border-radius: 50%;
    cursor: pointer;
    border: 1px solid white;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.layer-opacity-slider::-moz-range-thumb {
    width: 12px;
    height: 12px;
    background: var(--color-primary);
    border-radius: 50%;
    cursor: pointer;
    border: 1px solid white;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.layer-opacity-value {
    font-size: var(--font-size-sm);
    color: var(--color-muted);
    font-weight: var(--font-weight-bold);
    min-width: 35px;
    text-align: right;
}

.layer-controls-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    margin-left: auto;
}

.layer-color-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-1);
}

.layer-color-label {
    font-size: 0.9rem;
    color: var(--color-muted);
    cursor: help;
}

.layer-color-picker {
    width: 24px;
    height: 24px;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    background: none;
    padding: 0;
    outline: none;
}

.layer-color-picker::-webkit-color-swatch-wrapper {
    padding: 0;
    border: none;
    border-radius: var(--border-radius-sm);
}

.layer-color-picker::-webkit-color-swatch {
    border: none;
    border-radius: var(--border-radius-sm);
}

.layer-color-value {
    font-size: 0.9rem;
    cursor: help;
    transition: color 0.2s ease;
}

.layer-reset-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    padding: var(--spacing-1);
    border-radius: var(--border-radius-sm);
    transition: background-color 0.2s ease;
    color: var(--color-muted);
}

.layer-reset-btn:hover {
    background: rgba(52, 152, 219, 0.1);
    color: #3498db;
}

.layer-reset-btn:active {
    transform: scale(0.95);
}

.layer-remove-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    padding: var(--spacing-1);
    border-radius: var(--border-radius-sm);
    transition: background-color 0.2s ease;
}

.layer-remove-btn:hover {
    background: rgba(231, 76, 60, 0.1);
    color: var(--color-danger);
}

/* --- Main Container --- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-4);
}

main {
    min-height: calc(100vh - 200px);
}

section {
    background: var(--color-surface);
    border-radius: var(--border-radius);
    padding: var(--spacing-4);
    margin-bottom: var(--spacing-4);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

section h2 {
    margin: 0 0 var(--spacing-4) 0;
    color: var(--color-primary);
    font-size: var(--font-size-h2);
}

/* --- Upload Section --- */
.upload-area {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-4);
}

@media (max-width: 768px) {
    .upload-area {
        grid-template-columns: 1fr;
    }
}

.upload-group {
    background: var(--color-background);
    border-radius: var(--border-radius);
    padding: var(--spacing-3);
}

.upload-group h3 {
    margin: 0 0 var(--spacing-3) 0;
    color: var(--color-text);
    font-size: var(--font-size-lg);
}

.file-upload-container {
    position: relative;
}

.file-upload-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-4);
    border: 2px dashed var(--color-border);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.2s ease;
    background: var(--color-surface);
}

.file-upload-label:hover {
    border-color: var(--color-primary);
    background: rgba(155, 89, 182, 0.05);
}

.upload-icon {
    font-size: 2rem;
    opacity: 0.6;
}

.upload-text {
    flex: 1;
}

.upload-title {
    display: block;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-1);
}

.upload-subtitle {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-muted);
}

.image-preview {
    position: relative;
    margin-top: var(--spacing-3);
    border-radius: var(--border-radius);
    overflow: hidden;
    background: var(--color-surface);
}

.image-preview img {
    width: 100%;
    height: auto;
    display: block;
}

.remove-btn {
    position: absolute;
    top: var(--spacing-2);
    right: var(--spacing-2);
    background: var(--color-danger);
    color: white;
    border: none;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    cursor: pointer;
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s ease;
}

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

.overlay-list {
    margin-top: var(--spacing-3);
}

.overlay-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2);
    background: var(--color-surface);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-2);
}

.overlay-item img {
    width: 50px;
    height: 50px;
    object-fit: cover;
    border-radius: var(--border-radius-sm);
}

.overlay-item-name {
    flex: 1;
    font-weight: var(--font-weight-bold);
}

.overlay-item-size {
    color: var(--color-muted);
    font-size: var(--font-size-sm);
}

/* --- Buttons --- */
.button {
    padding: var(--spacing-2) var(--spacing-4);
    border: none;
    border-radius: var(--border-radius);
    font-weight: var(--font-weight-bold);
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
}

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

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

.button-primary:hover:not(:disabled) {
    background: var(--color-primary-hover);
}

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

.button-secondary:hover:not(:disabled) {
    background: var(--color-secondary-hover);
}

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

.button-success:hover:not(:disabled) {
    background: var(--color-success-hover);
}

.button-warning {
    background: var(--color-warning);
    color: white;
}

.button-warning:hover:not(:disabled) {
    background: var(--color-warning-hover);
}

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

.button-danger:hover:not(:disabled) {
    background: var(--color-danger-hover);
}

/* --- Editor Section --- */
.editor-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-4);
    padding: var(--spacing-3);
    background: var(--color-background);
    border-radius: var(--border-radius);
    flex-wrap: wrap;
    gap: var(--spacing-2);
}

.toolbar-group {
    display: flex;
    gap: var(--spacing-2);
    flex-wrap: wrap;
}

.canvas-container {
    position: relative;
    margin-bottom: var(--spacing-4);
    background: var(--color-background);
    border-radius: var(--border-radius);
    padding: var(--spacing-3);
    overflow: auto;
}

.canvas-wrapper {
    position: relative;
    display: inline-block;
    margin: 0 auto;
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    overflow: hidden;
}

#imageCanvas {
    display: block;
    background: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: crosshair;
    max-width: 100%;
    height: auto;
}

.canvas-tips {
    margin-top: var(--spacing-3);
    padding: var(--spacing-3);
    background: rgba(155, 89, 182, 0.05);
    border: 1px solid rgba(155, 89, 182, 0.2);
    border-radius: var(--border-radius);
}

.tip-text {
    margin: 0;
    font-size: var(--font-size-sm);
    color: var(--color-muted);
    line-height: 1.4;
}

.tip-text strong {
    color: var(--color-text);
}

.footer-tagline {
    font-size: var(--font-size-sm);
    color: var(--color-muted);
    margin: 0;
    text-align: center;
}

.build-date {
    font-size: var(--font-size-sm);
    color: var(--color-muted);
    margin: var(--spacing-2) 0 0 0;
    text-align: center;
    font-style: italic;
    opacity: 0.8;
}

.build-date span {
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
    font-style: normal;
}

.grid-overlay {
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 10; /* Ensure grid is on top of canvas */
    background-image: 
        repeating-linear-gradient(0deg, rgba(255, 140, 0, 0.8) 0px, transparent 1px, transparent 40px, rgba(255, 140, 0, 0.8) 40px),
        repeating-linear-gradient(90deg, rgba(0, 255, 0, 0.8) 0px, transparent 1px, transparent 40px, rgba(0, 255, 0, 0.8) 40px);
    border: 2px solid rgba(255, 140, 0, 0.8);
    border-radius: var(--border-radius);
}

/* --- Layers Panel --- */
.layers-panel {
    background: var(--color-background);
    border-radius: var(--border-radius);
    padding: var(--spacing-3);
    margin-bottom: var(--spacing-4);
}

.layers-panel h3 {
    margin: 0 0 var(--spacing-3) 0;
    color: var(--color-text);
    font-size: var(--font-size-lg);
}

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

.layer-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2);
    background: var(--color-surface);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-2);
    cursor: move;
    transition: background-color 0.2s ease;
}

.layer-item:hover {
    background: rgba(155, 89, 182, 0.05);
}

.layer-item.active {
    background: rgba(155, 89, 182, 0.1);
    border: 1px solid var(--color-primary);
}

.layer-item.dragging {
    opacity: 0.5;
}

.layer-visibility {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    padding: var(--spacing-1);
    border-radius: var(--border-radius-sm);
    transition: background-color 0.2s ease;
}

.layer-visibility:hover {
    background: rgba(0, 0, 0, 0.1);
}

.layer-name {
    flex: 1;
    font-weight: var(--font-weight-bold);
}

.layer-actions {
    display: flex;
    gap: var(--spacing-1);
}

.layer-action-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    padding: var(--spacing-1);
    border-radius: var(--border-radius-sm);
    transition: background-color 0.2s ease;
}

.layer-action-btn:hover {
    background: rgba(0, 0, 0, 0.1);
}

.layer-action-btn.delete:hover {
    background: rgba(231, 76, 60, 0.1);
    color: var(--color-danger);
}

/* --- Export Section --- */
.export-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-3);
    background: var(--color-background);
    border-radius: var(--border-radius);
    flex-wrap: wrap;
}

.export-format {
    padding: var(--spacing-2);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background: var(--color-surface);
    font-family: inherit;
}

/* --- Help Section --- */
.help-article {
    margin-bottom: var(--spacing-4);
    padding-bottom: var(--spacing-4);
    border-bottom: 1px solid var(--color-border);
}

.help-article:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.help-article h3 {
    color: var(--color-primary);
    margin: 0 0 var(--spacing-2) 0;
}

.help-article ul,
.help-article ol {
    margin: var(--spacing-2) 0;
    padding-left: var(--spacing-4);
}

.help-article li {
    margin-bottom: var(--spacing-1);
}

.help-article strong {
    color: var(--color-text);
}

/* --- Utility Classes --- */
.hidden {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* --- Footer --- */
footer {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: #ecf0f1;
    padding: var(--spacing-6) 0 var(--spacing-4) 0;
    margin-top: var(--spacing-8);
    border-top: 3px solid var(--color-primary);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
}

footer .container {
    padding: 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-4);
    flex-wrap: wrap;
    gap: var(--spacing-4);
}

.footer-info p {
    margin: 0 0 var(--spacing-2) 0;
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-sm);
}

.footer-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-sm);
}

.footer-links a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--color-primary);
    text-decoration: none;
}

.separator {
    color: #7f8c8d;
    font-size: 0.8rem;
}

.footer-actions {
    display: flex;
    align-items: center;
}

.footer-home-btn {
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: var(--font-weight-bold);
    transition: all 0.2s ease;
    box-shadow: 0 2px 10px rgba(155, 89, 182, 0.3);
}

.footer-home-btn:hover {
    background: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(155, 89, 182, 0.4);
    text-decoration: none;
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-4);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-tagline {
    margin: 0;
    font-size: var(--font-size-sm);
    color: #95a5a6;
    font-style: italic;
}

/* Responsive footer */
@media (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-3);
    }
    
    .footer-info {
        order: 2;
    }
    
    .footer-actions {
        order: 1;
    }
    
    .footer-links {
        justify-content: center;
    }
}

footer a {
    color: #ecf0f1;
    text-decoration: none;
}

footer a:hover {
    color: var(--color-primary);
    text-decoration: none;
}

/* --- Legal Modal --- */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-4);
    box-sizing: border-box;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--color-surface);
    border-radius: var(--border-radius-lg);
    max-width: 600px;
    max-height: 80vh;
    width: 100%;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    display: flex;
    flex-direction: column;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-4);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-hover) 100%);
    color: white;
    border-bottom: 2px solid var(--color-primary);
}

.modal-header h2 {
    margin: 0;
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
}

.modal-close-btn {
    background: none;
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    padding: var(--spacing-1);
    border-radius: var(--border-radius);
    transition: background-color 0.2s ease;
    line-height: 1;
}

.modal-close-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.modal-body {
    padding: var(--spacing-4);
    overflow-y: auto;
    flex: 1;
    background: var(--color-surface);
}

.legal-section {
    margin-bottom: var(--spacing-4);
    padding-bottom: var(--spacing-4);
    border-bottom: 1px solid var(--color-border);
}

.legal-section:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.legal-section h3 {
    margin: 0 0 var(--spacing-2) 0;
    color: var(--color-primary);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
}

.legal-section p {
    margin: 0 0 var(--spacing-2) 0;
    line-height: 1.6;
    color: var(--color-text);
}

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

.legal-section strong {
    color: var(--color-text);
    font-weight: var(--font-weight-bold);
}

.modal-footer {
    padding: var(--spacing-4);
    background: var(--color-background);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

/* Responsive modal */
@media (max-width: 768px) {
    .modal {
        padding: var(--spacing-2);
    }
    
    .modal-content {
        max-height: 90vh;
    }
    
    .modal-header {
        padding: var(--spacing-3);
    }
    
    .modal-header h2 {
        font-size: var(--font-size-lg);
    }
    
    .modal-body {
        padding: var(--spacing-3);
    }
    
    .modal-footer {
        padding: var(--spacing-3);
    }
}

.legal-link {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.2s ease;
}

.legal-link:hover {
    color: var(--color-primary);
    text-decoration: none;
}

/* --- Light Mode --- */
body.light-mode {
    --color-text: #2c3e50;
    --color-background: #f5f7fa;
    --color-surface: #ffffff;
    --color-border: #dfe6e9;
    --color-muted: #95a5a6;
    --color-code-bg: #ecf0f1;
}

/* Light mode specific overrides */
body.light-mode .file-upload-label {
    background: var(--color-surface);
}

body.light-mode .file-upload-label:hover {
    background: rgba(155, 89, 182, 0.05);
}

body.light-mode .layer-item:hover {
    background: rgba(155, 89, 182, 0.05);
}

body.light-mode .layer-item.active {
    background: rgba(155, 89, 182, 0.1);
}

body.light-mode .layer-action-btn:hover {
    background: rgba(0, 0, 0, 0.05);
}

body.light-mode .layer-action-btn.delete:hover {
    background: rgba(231, 76, 60, 0.05);
}

/* --- Dark Mode --- */
body.dark-mode {
    --color-text: #ecf0f1;
    --color-background: #2c3e50;
    --color-surface: #34495e;
    --color-border: #4a5f7a;
    --color-muted: #95a5a6;
    --color-code-bg: #2c3e50;
}

body.dark-mode .file-upload-label {
    background: var(--color-surface);
}

body.dark-mode .file-upload-label:hover {
    background: rgba(155, 89, 182, 0.1);
}

body.dark-mode .layer-item:hover {
    background: rgba(155, 89, 182, 0.2);
}

body.dark-mode .layer-item.active {
    background: rgba(155, 89, 182, 0.3);
}

body.dark-mode .layer-action-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

body.dark-mode .layer-action-btn.delete:hover {
    background: rgba(231, 76, 60, 0.2);
}

/* --- Responsive Design --- */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-2);
    }
    
    section {
        padding: var(--spacing-3);
    }
    
    header {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-2);
    }
    
    .editor-toolbar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .toolbar-group {
        justify-content: center;
    }
    
    .export-section {
        flex-direction: column;
        align-items: stretch;
    }
}

@media (max-width: 480px) {
    .upload-area {
        grid-template-columns: 1fr;
    }
    
    .toolbar-group {
        flex-direction: column;
    }
    
    .button {
        width: 100%;
        justify-content: center;
    }
}