/* Drawing Editor Styles */
:root {
    --bg-color: #ffffff;
    --panel-bg: #f8f9fa;
    --border-color: #e9ecef;
    --text-color: #333;
    --accent-color: #52E679;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #f0f2f5;
    color: #333;
    overflow: hidden;
}

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

/* Header */
header {
    background: white;
    border-bottom: 1px solid #ddd;
    padding: 12px 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.nav-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: none;
}

.back-button {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    padding: 8px 16px;
    border-radius: 6px;
    transition: background-color 0.2s;
}

.back-button:hover {
    background-color: #f0f2f5;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 20px;
}

.brand-section {
    display: flex;
    align-items: center;
    gap: 12px;
}

.ks-icon {
    width: 40px;
    height: 40px;
    background: var(--accent-color);
    background-image: url('KS Icon Black.png');
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 16px;
    border-radius: 8px;
    letter-spacing: -1px;
    box-shadow: 0 2px 4px rgba(82, 230, 121, 0.3);
    color: #000000;
}

.brand-info {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.brand-name {
    font-weight: 700;
    font-size: 14px;
    color: var(--accent-color);
    letter-spacing: 0.5px;
}

.app-name {
    font-size: 12px;
    color: #666;
    font-weight: 500;
}

header h1 {
    font-size: 1.5rem;
    color: #333;
}

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

/* Hide mobile menu toggles on desktop */
.mobile-menu-toggle {
    display: none;
}

.nav-btn {
    background: var(--accent-color);
    color: #000000;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.2s;
}

.nav-btn:hover {
    background: #42d969;
    color: #000000;
}

/* Editor Layout */
.editor-layout {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Side Panels */
.tools-panel, .export-panel {
    width: 280px;
    background: white;
    border-right: 1px solid #ddd;
    padding: 20px;
    overflow-y: auto;
    flex-shrink: 0;
}

.export-panel {
    border-right: none;
    border-left: 1px solid #ddd;
}

.tool-section {
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 1px solid #eee;
}

.tool-section:last-child {
    border-bottom: none;
}

.tool-section h3 {
    margin-bottom: 15px;
    color: #333;
    font-size: 1rem;
    font-weight: 600;
}

/* Canvas Size */
#canvasSize {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-bottom: 10px;
}

.custom-size-inputs {
    display: flex;
    align-items: center;
    gap: 8px;
}

.custom-size-inputs input {
    flex: 1;
    padding: 6px;
    border: 1px solid #ddd;
    border-radius: 4px;
    width: 60px;
}

.custom-size-inputs button {
    background: var(--accent-color);
    color: #000000;
    border: none;
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
}

/* Tool Buttons */
.tool-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.tool-group {
    margin-bottom: 25px;
}

.tools-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr 1fr;
    gap: 10px;
}

.tool-btn {
    background: #f8f9fa;
    border: 2px solid #e9ecef;
    padding: 10px 8px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
    font-size: 0.85rem;
    white-space: nowrap;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 45px;
}

.tool-btn:hover {
    background: #e9ecef;
}

.tool-btn.active {
    background: var(--accent-color);
    color: #000000;
    border-color: var(--accent-color);
}

.tool-icon {
    display: block;
    font-size: 1.2rem;
    margin-bottom: 4px;
}

/* Mirror and Transform Controls */
.mirror-tools {
    margin-top: 16px;
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid #e9ecef;
}

.mirror-tools h4, .transform-tools h4 {
    margin: 0 0 10px 0;
    font-size: 0.9rem;
    color: #666;
}

.transform-tools {
    margin-top: 15px;
}

.mirror-controls {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.mirror-controls label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    cursor: pointer;
    user-select: none;
}

.mirror-controls input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.transform-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.transform-btn {
    background: #6c757d;
    color: white;
    border: none;
    padding: 8px 6px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: background-color 0.2s;
    text-align: center;
}

.transform-btn:hover {
    background: #5a6268;
}

/* Fill Pattern Controls */
.fill-patterns-header {
    margin-bottom: 10px;
}

.pattern-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
    margin-bottom: 15px;
}

.gradient-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
}

.pattern-btn {
    background: var(--panel-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 10px 8px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.2s;
    text-align: center;
    white-space: nowrap;
}

.pattern-btn:hover {
    background: var(--border-color);
    border-color: var(--text-color);
}

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

.gradient-angle-controls {
    padding: 10px;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin-top: 10px;
}

/* Updated gradient controls */
.gradient-controls {
    padding: 10px;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin-top: 10px;
}

/* Gradient variant controls */
.gradient-variant-controls {
    padding: 10px;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin-top: 10px;
}

.variant-btn {
    background: var(--panel-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 10px 8px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.2s;
    text-align: center;
    white-space: nowrap;
}

.variant-btn:hover {
    background: var(--border-color);
    border-color: var(--text-color);
}

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

.angle-selector input[type="range"] {
    width: 100%;
    margin: 5px 0;
}

.angle-selector {
    margin-top: 5px;
}

.fill-pattern-tools,
.gradient-tools {
    margin-bottom: 15px;
}

.fill-pattern-tools h4,
.gradient-tools h4 {
    margin-bottom: 8px;
    font-size: 0.9rem;
    color: var(--text-color);
}

/* Line Pattern Controls */
.line-pattern-controls {
    padding: 10px;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin-top: 10px;
}

.line-controls {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.control-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.control-row label {
    min-width: 60px;
    font-size: 0.85rem;
    margin-bottom: 0;
}

.control-row input[type="range"] {
    flex: 1;
    margin: 0;
}

.control-row span {
    min-width: 40px;
    font-size: 0.8rem;
    text-align: right;
    color: var(--text-color);
}

/* Brush Settings */
.tool-section label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 0.9rem;
}

input[type="range"] {
    width: 100%;
    margin-bottom: 15px;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    background: #e9ecef;
    border-radius: 3px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.color-picker {
    display: flex;
    gap: 5px;
    margin-bottom: 15px;
}

.brush-shape {
    display: flex;
    gap: 5px;
    margin-bottom: 15px;
}

.color-btn, .brush-shape-btn {
    flex: 1;
    padding: 8px 12px;
    border: 2px solid #ddd;
    border-radius: 6px;
    background: white;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.9rem;
}

.color-btn:hover, .brush-shape-btn:hover {
    border-color: var(--accent-color);
}

.color-btn.active, .brush-shape-btn.active {
    border-color: var(--accent-color);
    background: var(--accent-color);
    color: #000000;
}

/* Edit Buttons */
.edit-btn, .export-btn {
    width: 100%;
    background: #28a745;
    color: white;
    border: none;
    padding: 10px;
    margin-bottom: 8px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.2s;
}

.edit-btn:hover, .export-btn:hover {
    background: #218838;
}

.edit-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.export-btn {
    background: var(--accent-color);
    color: #000000;
}

.export-btn:hover {
    background: #42d969;
    color: #000000;
}

/* Animation Controls */
.animation-header {
    margin-bottom: 15px;
}

.animation-header label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    user-select: none;
}

.animation-header input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
    border: 2px solid #dee2e6;
    border-radius: 3px;
    background: white;
    position: relative;
    outline: none;
}

.animation-header input[type="checkbox"]:checked {
    background: var(--accent-color);
    border-color: var(--accent-color);
}

.animation-header input[type="checkbox"]:checked::after {
    content: '✓';
    position: absolute;
    color: #000000;
    font-size: 12px;
    font-weight: bold;
    top: -2px;
    left: 1px;
}

.frame-info {
    text-align: center;
    margin-bottom: 10px;
    font-weight: 500;
}

.frame-buttons {
    display: flex;
    gap: 5px;
    justify-content: center;
    margin-bottom: 15px;
}

.frame-buttons button {
    background: #e9ecef;
    color: #333;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.2s;
}

.frame-buttons button:hover:not(:disabled) {
    background: #d1ecf1;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.frame-buttons button:disabled {
    background: #6c757d;
    color: #999;
    cursor: not-allowed;
}

.animation-controls {
    margin-bottom: 15px;
}

.animation-mode {
    margin-top: 10px;
    text-align: center;
}

.animation-mode label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: #333;
}

.mode-btn {
    background: #e9ecef;
    color: #333;
    border: 2px solid #dee2e6;
    padding: 8px 12px;
    margin: 2px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.mode-btn:hover {
    background: #d1ecf1;
    border-color: #b8daff;
}

.mode-btn.active {
    background: var(--accent-color);
    color: #000000;
    border-color: var(--accent-color);
}

/* Collapsible and Toggle Button Styles */
.collapsible-btn {
    width: 100%;
    background: var(--panel-bg);
    color: var(--text-color);
    border: 2px solid var(--border-color);
    padding: 12px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.2s;
    text-align: left;
    position: relative;
}

.collapsible-btn:hover {
    background: #e9ecef;
    border-color: var(--accent-color);
}

.collapsible-btn.active {
    background: var(--accent-color);
    color: #000000;
    border-color: var(--accent-color);
}

.collapsible-btn::after {
    content: '▼';
    position: absolute;
    right: 16px;
    transition: transform 0.2s;
}

.collapsible-btn.active::after {
    transform: rotate(180deg);
}

.toggle-btn {
    background: #e9ecef;
    color: #333;
    border: 2px solid #dee2e6;
    padding: 10px 16px;
    margin: 4px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s;
    min-height: 44px; /* Touch-friendly */
}

.toggle-btn:hover {
    background: #d1ecf1;
    border-color: #b8daff;
}

.toggle-btn.active {
    background: var(--accent-color);
    color: #000000;
    border-color: var(--accent-color);
    box-shadow: 0 2px 4px rgba(82, 230, 121, 0.3);
}

/* Rectangle thickness styles */
.thickness-section {
    margin-top: 25px;
}

.thickness-style, .fill-style {
    display: flex;
    gap: 5px;
    margin-top: 10px;
    justify-content: center;
}

.style-btn, .fill-btn {
    background: #e9ecef;
    color: #333;
    border: 2px solid #dee2e6;
    padding: 6px 10px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.2s;
}

.style-btn:hover, .fill-btn:hover {
    background: #d1ecf1;
    border-color: #b8daff;
}

.style-btn.active, .fill-btn.active {
    background: #28a745;
    color: white;
    border-color: #1e7e34;
}

.animation-controls button {
    width: 100%;
    background: var(--accent-color);
    color: #000000;
    border: none;
    padding: 8px;
    border-radius: 6px;
    cursor: pointer;
    margin-bottom: 10px;
    transition: background-color 0.2s;
}

.animation-controls button:hover {
    background: #42d969;
    color: #000000;
}

.onion-skin label {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
}

.onion-skin input[type="checkbox"] {
    margin-right: 8px;
    width: 16px;
    height: 16px;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
    border: 2px solid #dee2e6;
    border-radius: 3px;
    background: white;
    position: relative;
    outline: none;
}

.onion-skin input[type="checkbox"]:checked {
    background: var(--accent-color);
    border-color: var(--accent-color);
}

.onion-skin input[type="checkbox"]:checked::after {
    content: '✓';
    position: absolute;
    color: #000000;
    font-size: 12px;
    font-weight: bold;
    top: -2px;
    left: 1px;
}

/* Canvas Area */
.canvas-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: #e9ecef;
    overflow: hidden;
}

.canvas-container {
    flex: 1;
    display: block;
    position: relative;
    padding: 20px;
    overflow: auto;
}

.canvas-wrapper {
    position: absolute;
    display: inline-block;
    transition: all 0.3s ease-out;
}

.canvas-layer {
    position: absolute;
    top: 0;
    left: 0;
    cursor: crosshair;
    image-rendering: pixelated;
    image-rendering: -moz-crisp-edges;
    image-rendering: crisp-edges;
}

#backgroundCanvas {
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16"><rect width="8" height="8" fill="%23f0f0f0"/><rect x="8" y="8" width="8" height="8" fill="%23f0f0f0"/></svg>');
    z-index: 1;
}

#drawingCanvas {
    z-index: 1;  /* Drawing canvas at the bottom */
}

#onionCanvas {
    z-index: 10; /* Onion canvas on top - MUST be visible */
    pointer-events: none; /* So we can still draw on the canvas below */
}

#overlayCanvas {
    z-index: 4;
}

/* Canvas Controls */
.canvas-controls {
    background: white;
    padding: 15px 20px;
    border-top: 1px solid #ddd;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.zoom-controls {
    display: flex;
    align-items: center;
    gap: 10px;
}

.grid-controls {
    display: flex;
    align-items: center;
}

.grid-controls label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    color: #666;
    cursor: pointer;
    user-select: none;
}

.grid-controls input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
    border: 2px solid #dee2e6;
    border-radius: 3px;
    background: white;
    position: relative;
    outline: none;
}

.grid-controls input[type="checkbox"]:checked {
    background: var(--accent-color);
    border-color: var(--accent-color);
}

.grid-controls input[type="checkbox"]:checked::after {
    content: '✓';
    position: absolute;
    color: #000000;
    font-size: 12px;
    font-weight: bold;
    top: -2px;
    left: 1px;
}

.zoom-controls button {
    background: #6c757d;
    color: white;
    border: none;
    width: 72px;
    height: 36px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.2s;
}

.zoom-controls button:hover {
    background: #5a6268;
}

#zoomLevel {
    font-weight: 600;
    min-width: 60px;
    text-align: center;
}

.canvas-info {
    display: flex;
    gap: 20px;
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.9rem;
    color: #666;
}

/* Export Options */
#exportFormat {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-bottom: 15px;
}

.iphone-input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    font-size: 16px;
    background: #ffffff;
    transition: all 0.2s ease;
    outline: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

.iphone-input:focus {
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.iphone-input::placeholder {
    color: #9ca3af;
    opacity: 1;
}

.name-warning {
    color: #f59e0b;
    font-size: 12px;
    margin-top: 4px;
    padding: 4px 8px;
    background: #fef3c7;
    border-radius: 4px;
    border: 1px solid #fbbf24;
}

.export-spacing {
    height: 15px;
}

/* Frame Thumbnails */
.frame-thumbnails {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 300px;
    overflow-y: auto;
}

.frame-thumb {
    border: 2px solid #ddd;
    border-radius: 6px;
    padding: 8px;
    cursor: pointer;
    transition: border-color 0.2s;
    text-align: center;
}

.frame-thumb:hover {
    border-color: #667eea;
}

.frame-thumb.active {
    border-color: #667eea;
    background: #f0f4ff;
}

.thumb-canvas {
    width: 64px;
    height: 64px;
    border: 1px solid #eee;
    margin-bottom: 4px;
    image-rendering: pixelated;
    image-rendering: -moz-crisp-edges;
    image-rendering: crisp-edges;
}

.frame-label {
    font-size: 0.8rem;
    color: #666;
    display: block;
}

/* Code Output */
#codeOutput {
    width: 100%;
    height: 200px;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.8rem;
    resize: vertical;
    background: #f8f9fa;
    margin-bottom: 10px;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .tools-panel, .export-panel {
        width: 240px;
    }
    
    .tool-buttons {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 900px) {
    .editor-layout {
        flex-direction: column;
    }
    
    .tools-panel, .export-panel {
        width: 100%;
        height: auto;
        max-height: 200px;
    }
    
    .canvas-area {
        height: 400px;
    }
}

/* Help Modal Styles */
.modal {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: var(--bg-color);
    margin: 5% auto;
    padding: 0;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    width: 90%;
    max-width: 800px;
    max-height: 80vh;
    overflow: hidden;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    background: var(--accent-color);
    color: white;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    margin: 0;
    font-size: 1.5rem;
}

.close {
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: opacity 0.2s;
}

.close:hover {
    opacity: 0.7;
}

.modal-body {
    padding: 20px 30px;
    max-height: 60vh;
    overflow-y: auto;
    background: var(--panel-bg);
    color: var(--text-color);
}

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

.help-section h3 {
    color: var(--text-color);
    margin-bottom: 15px;
    font-size: 1.2rem;
    border-bottom: 2px solid #667eea;
    padding-bottom: 5px;
}

.shortcut-grid {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 10px 20px;
    align-items: center;
}

.key {
    background: #f8f9fa;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 4px 8px;
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.9rem;
    font-weight: bold;
    text-align: center;
    color: #555;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.help-section ul {
    list-style: none;
    padding: 0;
}

.help-section li {
    background: #f8f9fa;
    margin: 8px 0;
    padding: 10px 15px;
    border-left: 4px solid #667eea;
    border-radius: 4px;
}

.help-section li::before {
    content: "💡 ";
    margin-right: 8px;
}

/* Hide mobile elements on desktop */
.mobile-top-bar,
.mobile-bottom-toolbar {
    display: none;
}

@media (max-width: 768px) {
    /* Hide desktop navigation and back button on mobile */
    .desktop-nav,
    .back-button {
        display: none;
    }
    
    /* Mobile Top Bar Styles */
    .mobile-top-bar {
        display: flex;
        gap: 10px;
        padding: 8px 0;
        justify-content: center;
    }
    
    .mobile-dropdown {
        position: relative;
    }
    
    .mobile-dropdown-btn {
        background: var(--accent-color);
        color: #000;
        border: none;
        padding: 8px 16px;
        border-radius: 6px;
        cursor: pointer;
        font-size: 0.9rem;
        font-weight: 500;
        transition: background-color 0.2s;
        white-space: nowrap;
    }
    
    .mobile-dropdown-btn:hover {
        background: #f0f0f0;
    }
    
    .mobile-dropdown-btn.active {
        background: #d4d4d4;
    }
    
    .mobile-dropdown-content {
        display: none;
        position: absolute;
        top: 100%;
        left: 50%;
        transform: translateX(-50%);
        background: white;
        border: 1px solid #ccc;
        border-radius: 6px;
        box-shadow: 0 4px 12px rgba(0,0,0,0.15);
        z-index: 1100;
        margin-top: 4px;
        min-width: 180px;
        max-width: 90vw;
        max-height: 60vh;
        overflow-y: auto;
    }
    
    .mobile-dropdown-content.active {
        display: block;
    }
    
    .mobile-dropdown-content button {
        display: block;
        width: 100%;
        padding: 12px 16px;
        background: none;
        border: none;
        text-align: left;
        cursor: pointer;
        font-size: 0.9rem;
        transition: background-color 0.2s;
    }
    
    .mobile-dropdown-content button:hover {
        background: #f5f5f5;
    }
    
    .mobile-dropdown-content button:first-child {
        border-radius: 6px 6px 0 0;
    }
    
    .mobile-dropdown-content button:last-child {
        border-radius: 0 0 6px 6px;
    }

    /* Mobile Tool Settings Content */
    #mobileToolSettingsContent {
        padding: 15px;
        background: white;
        color: #333333;
        max-height: 60vh;
        overflow-y: auto;
    }

    #mobileToolSettingsContent .mobile-tool-settings h4 {
        margin: 0 0 15px 0;
        color: #333333;
        font-size: 14px;
        font-weight: 600;
        border-bottom: 1px solid #dddddd;
        padding-bottom: 5px;
    }

    #mobileToolSettingsContent .setting-group {
        margin-bottom: 15px;
    }

    #mobileToolSettingsContent label {
        display: block;
        margin-bottom: 8px;
        font-size: 12px;
        color: #666666;
        font-weight: 500;
    }

    #mobileToolSettingsContent input[type="range"] {
        width: 100%;
        margin: 5px 0;
        height: 6px;
        background: #f0f0f0;
        border-radius: 3px;
        outline: none;
    }

    #mobileToolSettingsContent input[type="range"]::-webkit-slider-thumb {
        appearance: none;
        width: 18px;
        height: 18px;
        background: var(--accent-color);
        border-radius: 50%;
        cursor: pointer;
    }

    /* Mobile Button Groups */
    .brush-shape-mobile,
    .mobile-color-picker,
    .mobile-fill-style,
    .mobile-thickness-style,
    .mobile-pattern-grid,
    .mobile-edit-buttons {
        display: flex;
        gap: 8px;
        flex-wrap: wrap;
        margin-top: 5px;
    }

    .mobile-brush-shape-btn,
    .mobile-color-btn,
    .mobile-fill-btn,
    .mobile-style-btn,
    .mobile-pattern-btn,
    .mobile-edit-btn {
        padding: 8px 12px;
        border: 1px solid #dddddd;
        background: #f8f8f8;
        color: #333333;
        border-radius: 6px;
        font-size: 11px;
        cursor: pointer;
        transition: all 0.2s ease;
        flex: 1;
        min-width: fit-content;
        text-align: center;
    }

    .mobile-brush-shape-btn:hover,
    .mobile-color-btn:hover,
    .mobile-fill-btn:hover,
    .mobile-style-btn:hover,
    .mobile-pattern-btn:hover,
    .mobile-edit-btn:hover:not(:disabled) {
        background: #e8e8e8;
        border-color: #cccccc;
    }

    .mobile-brush-shape-btn.active,
    .mobile-color-btn.active,
    .mobile-fill-btn.active,
    .mobile-style-btn.active,
    .mobile-pattern-btn.active {
        background: var(--accent-color);
        border-color: var(--accent-color);
        color: white;
    }

    /* Pattern Grid Specific Layout */
    .mobile-pattern-grid {
        display: grid;
        grid-template-columns: 1fr 1fr 1fr;
        gap: 8px;
        margin-top: 5px;
    }

    .mobile-pattern-btn {
        flex: none;
    }

    /* Edit Buttons Layout */
    .mobile-edit-buttons {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 8px;
        margin-top: 5px;
    }

    .mobile-edit-btn:disabled {
        opacity: 0.5;
        cursor: not-allowed;
        background: #f0f0f0;
        color: #aaaaaa;
    }

    /* Color Button Specific Styles */
    .mobile-color-btn[data-color="black"] {
        background: #000000;
        color: #ffffff;
        border-color: #333333;
    }

    .mobile-color-btn[data-color="white"] {
        background: #ffffff;
        color: #000000;
        border-color: #cccccc;
    }

    .mobile-color-btn[data-color="black"].active {
        box-shadow: 0 0 0 2px var(--accent-color);
    }

    .mobile-color-btn[data-color="white"].active {
        box-shadow: 0 0 0 2px var(--accent-color);
    }

    /* Mobile Checkbox Style */
    .mobile-checkbox {
        display: flex;
        align-items: center;
        gap: 8px;
        margin-top: 8px;
    }

    .mobile-checkbox input[type="checkbox"] {
        width: 16px;
        height: 16px;
    }

    .mobile-checkbox label {
        margin: 0;
        font-size: 12px;
        cursor: pointer;
    }

    /* Mobile Bottom Toolbar */
    .mobile-bottom-toolbar {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: var(--bg-color);
        border-top: 1px solid var(--border-color);
        padding: 10px;
        z-index: 1000;
        display: flex;
        flex-direction: column;
        gap: 10px;
    }
    
    /* 3x2 Tool Grid */
    .mobile-tool-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        grid-template-rows: repeat(2, 1fr);
        gap: 8px;
        margin-bottom: 8px;
    }
    
    .mobile-tool-btn {
        background: var(--button-bg);
        border: 1px solid var(--border-color);
        color: var(--text-color);
        padding: 12px;
        border-radius: 6px;
        font-size: 18px;
        cursor: pointer;
        transition: all 0.2s ease;
        display: flex;
        align-items: center;
        justify-content: center;
        min-height: 45px;
    }
    
    .mobile-tool-btn:hover {
        background: var(--hover-bg);
        transform: translateY(-1px);
    }
    
    .mobile-tool-btn.active {
        background: var(--primary-color);
        color: white;
        box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    }
    
    /* Bottom Controls */
    .mobile-bottom-controls {
        display: flex;
        justify-content: space-between;
        align-items: center;
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .mobile-view-controls {
        display: flex;
        gap: 5px;
    }
    
    .mobile-control-btn {
        background: var(--button-bg);
        border: 1px solid var(--border-color);
        color: var(--text-color);
        padding: 8px 12px;
        border-radius: 6px;
        font-size: 12px;
        cursor: pointer;
        transition: all 0.2s ease;
    }
    
    .mobile-control-btn:hover {
        background: var(--hover-bg);
    }
    
    .mobile-zoom-controls {
        display: flex;
        align-items: center;
        gap: 8px;
    }
    
    .mobile-zoom-btn {
        background: var(--button-bg);
        border: 1px solid var(--border-color);
        color: var(--text-color);
        width: 35px;
        height: 35px;
        border-radius: 6px;
        font-size: 18px;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .mobile-zoom-display {
        font-size: 14px;
        font-weight: bold;
        min-width: 45px;
        text-align: center;
    }
    
    .mobile-tool-controls {
        display: flex;
        align-items: center;
        gap: 8px;
    }
    
    .mobile-color-picker {
        width: 35px;
        height: 35px;
        border: 1px solid var(--border-color);
        border-radius: 6px;
        cursor: pointer;
    }
    
    .mobile-size-slider {
        width: 60px;
    }
    
    .mobile-size-display {
        font-size: 12px;
        min-width: 30px;
        text-align: center;
    }
    
    /* Tool Settings Popup */
    .tool-settings-popup {
        position: fixed;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        background: var(--bg-color);
        border: 1px solid var(--border-color);
        border-radius: 10px;
        box-shadow: 0 4px 20px rgba(0,0,0,0.3);
        z-index: 2000;
        min-width: 300px;
        max-width: 90vw;
        max-height: 80vh;
        overflow: hidden;
    }
    
    .tool-settings-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 15px 20px;
        border-bottom: 1px solid var(--border-color);
        background: var(--header-bg);
    }
    
    .tool-settings-header h3 {
        margin: 0;
        color: var(--text-color);
        font-size: 18px;
    }
    
    .close-popup-btn {
        background: none;
        border: none;
        font-size: 24px;
        cursor: pointer;
        color: var(--text-color);
        padding: 0;
        width: 30px;
        height: 30px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: background 0.2s ease;
    }
    
    .close-popup-btn:hover {
        background: var(--hover-bg);
    }
    
    .tool-settings-content {
        padding: 20px;
        max-height: 60vh;
        overflow-y: auto;
    }
    
    .setting-group {
        margin-bottom: 20px;
    }
    
    .setting-group label {
        display: block;
        margin-bottom: 8px;
        font-weight: 500;
        color: var(--text-color);
    }
    
    .setting-group input[type="range"] {
        width: 100%;
        margin-bottom: 5px;
    }
    
    .setting-group input[type="checkbox"] {
        margin-right: 8px;
    }
    
    .setting-group span {
        font-size: 14px;
        color: var(--text-color);
        font-weight: bold;
    }
    
    /* Hide desktop panels on mobile */
    .tools-panel,
    .export-panel {
        display: none;
    }
    
    /* Adjust canvas for mobile */
    .canvas-wrapper {
        max-width: calc(100vw - 40px);
        max-height: calc(100vh - 200px);
    }
    
    /* Modal adjustments */
    .modal-content {
        width: 95%;
        margin: 2% auto;
    }
    
    .modal-header,
    .modal-body {
        padding: 15px 20px;
    }
    
    .shortcut-grid {
        grid-template-columns: 1fr;
        gap: 5px;
    }
    
    .key {
        justify-self: start;
    }
}

/* Modal Styles */
.modal {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    overflow: auto;
}

.modal-content {
    background-color: var(--bg-color);
    margin: 2% auto;
    padding: 0;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    padding: 15px 20px;
    background-color: var(--panel-bg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
    color: var(--text-color);
}

.modal-body {
    padding: 20px;
    background-color: #ffffff;
}

.modal-footer {
    padding: 15px 20px;
    background-color: var(--panel-bg);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.close {
    color: var(--text-color);
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
}

.close:hover {
    color: var(--accent-color);
}

/* Import Modal Styles */
.import-section {
    margin-bottom: 20px;
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-color);
}

.import-section h4 {
    margin: 0 0 15px 0;
    color: var(--text-color);
    font-size: 16px;
}

.setting-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.setting-row label {
    min-width: 80px;
    color: var(--text-color);
    font-size: 14px;
}

.setting-row input[type="range"] {
    flex: 1;
    min-width: 100px;
}

.setting-row input[type="number"] {
    width: 60px;
    padding: 4px;
    border: 1px solid var(--border-color);
    border-radius: 3px;
    background-color: var(--bg-color);
    color: var(--text-color);
}

.setting-row select {
    padding: 4px 8px;
    border: 1px solid var(--border-color);
    border-radius: 3px;
    background-color: var(--bg-color);
    color: var(--text-color);
}

.setting-row input[type="checkbox"] {
    margin-right: 5px;
}

#importOriginalImage, #importProcessedImage {
    margin-top: 10px;
    text-align: center;
    min-height: 50px;
    border: 1px dashed var(--border-color);
    border-radius: 4px;
    padding: 10px;
}

#importOriginalImage canvas, #importProcessedImage canvas {
    max-width: 100%;
    border: 1px solid var(--border-color);
    image-rendering: pixelated;
}

.btn {
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--panel-bg);
    color: var(--text-color);
    cursor: pointer;
    font-size: 14px;
}

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

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

.btn:disabled:hover {
    background-color: var(--panel-bg);
    color: var(--text-color);
}

.btn-primary {
    background-color: var(--accent-color);
    color: #000000;
}

.btn-primary:hover {
    background-color: #0056b3;
}

/* Footer Branding */
.app-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(5px);
    border-top: 1px solid var(--border-color);
    padding: 8px 20px;
    z-index: 100;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 12px;
    color: #666;
}

.ks-icon-small {
    width: 20px;
    height: 20px;
    background: var(--accent-color);
    background-image: url('KS Icon Black.png');
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    color: #000000;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 10px;
    border-radius: 4px;
    letter-spacing: -0.5px;
}

/* Mobile Touch Enhancements */
@media (max-width: 768px) {
    /* Larger touch targets for mobile */
    .toggle-btn, .collapsible-btn, .mode-btn {
        min-height: 48px;
        font-size: 1rem;
        padding: 14px 18px;
    }
    
    .mirror-controls {
        display: flex;
        flex-direction: column;
        gap: 8px;
    }
    
    .mirror-controls .toggle-btn {
        width: 100%;
        justify-content: center;
    }
    
    .transform-grid {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }
    
    .transform-btn {
        min-height: 48px;
        font-size: 1rem;
    }
    
    /* Animation controls mobile improvements */
    .animation-mode {
        display: flex;
        flex-direction: column;
        gap: 8px;
        margin-top: 12px;
    }
    
    .animation-mode .mode-btn {
        width: 100%;
    }
    
    /* Onion mode controls mobile improvements */
    .onion-mode-controls {
        display: flex;
        flex-direction: column;
        gap: 8px;
        margin-top: 12px;
    }
    
    .onion-mode-controls .mode-btn {
        width: 100%;
    }
    
    /* Tool sections mobile spacing */
    .tool-section {
        margin-bottom: 20px;
    }
    
    /* Frame buttons mobile improvements */
    .frame-buttons {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
    }
    
    .frame-buttons button {
        min-height: 44px;
        flex: 1;
        min-width: 44px;
    }
}

/* Touch-friendly improvements for all screen sizes */
button, .toggle-btn, .collapsible-btn, .mode-btn {
    touch-action: manipulation; /* Prevents zoom on touch */
    -webkit-tap-highlight-color: transparent; /* Removes tap highlight on mobile */
}

/* Ensure buttons are accessible with proper focus states */
button:focus, .toggle-btn:focus, .collapsible-btn:focus, .mode-btn:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Percentage Pattern Controls */
.percentage-pattern-controls {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 10px;
    margin-top: 10px;
}

.percentage-pattern-controls h4 {
    color: var(--text-color);
    margin-bottom: 8px;
    font-size: 14px;
}

/* Checkerboard Pattern Controls */
.checkerboard-pattern-controls,
.crosshatch-pattern-controls,
.dots-pattern-controls {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 10px;
    margin-top: 10px;
}

.checkerboard-pattern-controls h4,
.crosshatch-pattern-controls h4,
.dots-pattern-controls h4 {
    color: var(--text-color);
    margin-bottom: 8px;
    font-size: 14px;
}

.checkerboard-pattern-controls .control-row,
.crosshatch-pattern-controls .control-row,
.dots-pattern-controls .control-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.checkerboard-pattern-controls .control-row:last-child,
.crosshatch-pattern-controls .control-row:last-child,
.dots-pattern-controls .control-row:last-child {
    margin-bottom: 0;
}

.checkerboard-pattern-controls input[type="checkbox"],
.crosshatch-pattern-controls input[type="checkbox"],
.dots-pattern-controls input[type="checkbox"] {
    margin-right: 8px;
}