:root {
	/* Colors - Primary Palette */
	--primary: #667eea;
	--primary-hover: #5a6fd8;
	--secondary: #764ba2;
	--purple: #6f42c1;
	--purple-hover: #5a32a3;
	
	/* Colors - Status */
	--success: #28a745;
	--success-hover: #218838;
	--danger: #dc3545;
	--danger-hover: #c82333;
	--info: #17a2b8;
	--info-hover: #138496;
	--gray: #6c757d;
	--gray-hover: #5a6268;
	
	/* Text Colors */
	--text-dark: #e9ecef;
	--text-medium: #ced4da;
	--text-muted: #adb5bd;
	--text-light: #6c757d;
	
	/* Background Colors */
	--bg-white: #1a1a1a;
	--bg-light: #2d2d2d;
	--bg-canvas: #262626;
	
	/* Border Colors */
	--border: #404040;
	--border-light: #333;
	
	/* Layout Dimensions */
	--panel-width: 450px;
	--container-width: 1400px;
	--canvas-max: 400px;
	--canvas-max-mobile: 350px;
	
	/* Spacing System */
	--spacing-sm: 8px;
	--spacing: 15px;
	--spacing-lg: 20px;
	
	/* Border Radius */
	--radius: 8px;
	
	/* Font Sizes */
	--font-sm: 0.85rem;
	--font-base: 0.9rem;
	--font-lg: 1.5rem;
	
	/* Component Sizes */
	--thumb-size: 18px;
	--checkbox-size: 16px;
	
	/* Effects */
	--shadow: 0 4px 8px rgba(0,0,0,0.1);
	--shadow-lg: 0 10px 30px rgba(0,0,0,0.2);
	--shadow-button: 0 4px 8px rgba(220, 53, 69, 0.3);
	--transition: 0.3s ease;
	
	/* Transform */
	--lift: translateY(-1px);
	--scale-hover: scale(1.02);
}

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

body {
	font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
	background: linear-gradient(45deg, #0a0a0a 0%, #1a1a1a 100%);
	min-height: 100vh;
	color: var(--text-dark);
}

p {
	margin-bottom: var(--spacing);
	line-height: 1.6;
	font-size: var(--font-base);
}

a {
	color: var(--text-dark);
}

.container {
	max-width: var(--container-width);
	margin: 0 auto;
	padding: var(--spacing);
}

header {
	text-align: center;
	margin-bottom: calc(var(--spacing) * 2);
	color: white;
}

header h1 {
	font-size: var(--font-lg);
	margin-bottom: var(--spacing);
	text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

header p {
	font-size: var(--font-base);
	opacity: 0.9;
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--spacing);
    align-items: start;
}

.image-panel, .preset-panel, .canvas-panel, .settings-panel {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: calc(var(--spacing) * 1.5);
    box-shadow: var(--shadow-lg);
}

.image-panel h3, .preset-panel h3, .canvas-panel h3, .settings-panel h3 {
    margin-bottom: var(--spacing);
    font-size: var(--font-base);
    color: var(--text-medium);
    text-align: center;
}.file-controls {
	margin-bottom: var(--spacing);
	text-align: center;
}

/* File select button now uses btn system - update HTML to use: class="btn btn-primary" */

.drop-zone {
	width: 100%;
	max-width: var(--canvas-max);
	height: var(--canvas-max);
	border: 3px dashed var(--border);
	border-radius: var(--radius);
	display: flex;
	align-items: center;
	justify-content: center;
	cursor: pointer;
	transition: all var(--transition);
	position: relative;
	margin: 0 auto;
	overflow: hidden;
}

.drop-zone:hover {
	border-color: var(--primary);
	background: rgba(102, 126, 234, 0.1);
}

.drop-zone.dragover {
	border-color: var(--primary);
	background: rgba(102, 126, 234, 0.15);
	transform: var(--scale-hover);
}

.drop-text {
	text-align: center;
	color: var(--text-light);
}

.drop-text p {
	font-size: var(--font-base);
	margin-bottom: var(--spacing-sm);
}

.drop-text .small {
	font-size: var(--font-sm);
	opacity: 0.7;
}

#originalImage {
	max-width: 100%;
	max-height: 100%;
	width: auto;
	height: auto;
	border-radius: var(--radius);
	object-fit: contain;
}

#recreationCanvas {
	border: 2px solid var(--border-light);
	border-radius: var(--radius);
	display: block;
	margin: 0 auto var(--spacing) auto;
	background: var(--bg-canvas);
	max-width: 100%;
	max-height: var(--canvas-max);
	width: auto;
	height: auto;
	object-fit: contain;
}

.canvas-info {
	text-align: center;
	margin-bottom: var(--spacing);
	font-size: var(--font-base);
	color: var(--text-muted);
	font-family: monospace;
}

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

.stat {
	text-align: center;
	padding: var(--spacing-sm);
	background: var(--bg-light);
	border-radius: var(--radius);
	border: 1px solid var(--border-light);
	font-size: var(--font-sm);
}

.stat .label {
	display: block;
	color: var(--text-muted);
	margin-bottom: var(--spacing-sm);
}

.controls {
	display: flex;
	gap: var(--spacing-sm);
	justify-content: center;
	flex-wrap: wrap;
}

/* Unified Button System */
.btn {
	padding: var(--spacing);
	border: none;
	border-radius: var(--radius);
	cursor: pointer;
	transition: all var(--transition);
	min-width: 70px;
	flex: 1;
	font-size: var(--font-base);
	text-decoration: none;
	display: inline-block;
	box-sizing: border-box;
	text-align: center;
}

.btn:hover:not(:disabled) {
	transform: var(--lift);
}

.btn:disabled {
	opacity: 0.5;
	cursor: not-allowed;
	transform: none !important;
}

/* Button Color Variants */
.btn-primary {
	background: var(--primary);
	color: white;
	box-shadow: var(--shadow);
}

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

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

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

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

.btn-danger:hover:not(:disabled) {
	background: var(--danger-hover);
	box-shadow: var(--shadow-button);
}

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

.btn-info:hover:not(:disabled) {
	background: var(--info-hover);
}

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

.btn-purple:hover:not(:disabled) {
	background: var(--purple-hover);
}

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

.btn-gray:hover:not(:disabled) {
	background: var(--gray-hover);
}

/* Button Size Variants */
.btn-full {
	width: 100%;
	max-width: 200px;
}

/* Legacy Support - maintains existing functionality */
button {
	padding: var(--spacing-sm);
	border: none;
	border-radius: var(--radius);
	cursor: pointer;
	transition: all var(--transition);
	min-width: 70px;
	flex: 1;
}

button:disabled {
	opacity: 0.5;
	cursor: not-allowed;
	transform: none !important;
}

.brush-controls {
	padding: 0;
}

.control-group {
	margin-bottom: var(--spacing);
}

.control-group label {
	display: block;
	margin-bottom: var(--spacing-sm);
	color: var(--text-medium);
	font-size: var(--font-base);
}

.control-group select,
.control-group input[type="color"],
.control-group input[type="text"] {
	width: 100%;
	padding: var(--spacing-sm) 12px;
	border: 1px solid var(--border);
	border-radius: var(--radius);
	background: var(--bg-light);
	color: var(--text-dark);
	font-size: var(--font-base);
	cursor: pointer;
}

.control-group input[type="text"] {
	cursor: text;
	font-family: monospace;
}

.control-group select:focus,
.control-group input:focus {
	outline: none;
	border-color: var(--primary);
	box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
}

/* Letter Settings - Hide when letter brush is disabled */
.letter-settings {
	margin-bottom: var(--spacing);
}

.letter-settings.hidden {
	display: none !important;
}

/* Preset Management Styles */
.preset-panel {
    min-height: 200px;
}

.preset-controls {
    margin-bottom: var(--spacing);
}

.preset-controls .control-group {
    margin-bottom: var(--spacing-sm);
}

.preset-btn {
    margin-top: var(--spacing-sm);
    width: 100%;
}

.preset-list {
    margin-bottom: var(--spacing);
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-light);
}

.preset-empty {
    padding: var(--spacing);
    text-align: center;
    color: var(--text-muted);
    font-style: italic;
}

.preset-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing);
    border-bottom: 1px solid var(--border-light);
    transition: background-color var(--transition);
}

.preset-item:last-child {
    border-bottom: none;
}

.preset-item:hover {
    background: rgba(102, 126, 234, 0.05);
}

.preset-info {
    flex: 1;
}

.preset-name {
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 2px;
}

.preset-date {
    font-size: var(--font-sm);
    color: var(--text-muted);
    font-family: monospace;
}

.preset-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.preset-action-btn {
    padding: 4px 8px;
    font-size: var(--font-sm);
    min-width: auto;
    flex: none;
}

.preset-feedback {
    display: none;
    padding: var(--spacing-sm);
    border-radius: var(--radius);
    background: var(--bg-light);
    border: 1px solid var(--border);
    text-align: center;
}.range-controls {
	display: flex;
	align-items: center;
	gap: var(--spacing);
	margin-bottom: var(--spacing-sm);
}

.slider {
	flex: 1;
	height: 6px;
	border-radius: 3px;
	background: var(--border);
	outline: none;
	-webkit-appearance: none;
	appearance: none;
}

.slider::-webkit-slider-thumb {
	-webkit-appearance: none;
	appearance: none;
	width: var(--thumb-size);
	height: var(--thumb-size);
	border-radius: 50%;
	background: var(--primary);
	cursor: pointer;
	border: 2px solid var(--bg-white);
	box-shadow: var(--shadow);
}

.slider::-moz-range-thumb {
	width: var(--thumb-size);
	height: var(--thumb-size);
	border-radius: 50%;
	background: var(--primary);
	cursor: pointer;
	border: 2px solid var(--bg-white);
	box-shadow: var(--shadow);
}

.range-label {
	font-size: var(--font-sm);
	color: var(--text-muted);
	min-width: 80px;
	text-align: right;
	white-space: nowrap;
}

.checkbox-controls {
	display: flex;
	align-items: center;
	gap: var(--spacing-sm);
	margin-bottom: var(--spacing-sm);
}

.checkbox-controls input[type="checkbox"] {
	width: var(--checkbox-size);
	height: var(--checkbox-size);
	accent-color: var(--primary);
	cursor: pointer;
	background-color: var(--bg-light) !important;
	border: 1px solid var(--border);
	border-radius: 2px;
	-webkit-appearance: none;
	-moz-appearance: none;
	appearance: none;
	position: relative;
}

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

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

.checkbox-label {
	font-size: var(--font-base);
	color: var(--text-medium);
	cursor: pointer;
}

.dual-range-group {
	margin-bottom: calc(var(--spacing) * 1.5);
}

.dual-range-group .range-controls {
	margin-bottom: var(--spacing-xs);
}

.dual-range-group .range-controls:last-child {
	margin-bottom: 0;
}

.dual-range-group .range-label {
	min-width: 90px;
}

.dual-range-group label {
	margin-bottom: var(--spacing);
	font-weight: 600;
}

/* Shape Selection Styles */
.shape-selection {
	display: grid;
	grid-template-columns: repeat(2, 1fr);
	gap: var(--spacing-sm);
	margin-bottom: var(--spacing);
}

.shape-selection .control-group {
	margin-bottom: var(--spacing-sm);
}

.shape-selection .checkbox-controls {
	margin-bottom: 0;
}

.shape-selection .checkbox-label {
	font-size: var(--font-sm);
}

/* Section Headers */
.section-header {
	margin: var(--spacing-lg) 0 var(--spacing) 0;
	border-bottom: 2px solid var(--border);
	padding-bottom: var(--spacing-sm);
}

.section-header:first-child {
	margin-top: 0;
}

.section-header h3 {
	margin: 0;
	font-size: var(--font-base);
	color: var(--text-dark);
	text-transform: uppercase;
	letter-spacing: 0.5px;
}

/* Settings Footer */
.settings-footer {
	margin-top: var(--spacing);
	padding-top: var(--spacing);
	border-top: 1px solid var(--border);
	text-align: center;
}

/* Reset button now uses unified button system */
.reset-settings-btn {
	/* Extend btn and btn-danger classes */
	padding: var(--spacing);
	border: none;
	border-radius: var(--radius);
	cursor: pointer;
	transition: all var(--transition);
	font-size: var(--font-base);
	text-decoration: none;
	display: inline-block;
	box-sizing: border-box;
	text-align: center;
	background: var(--danger);
	color: white;
	width: 100%;
	max-width: 200px;
}

.reset-settings-btn:hover {
	background: var(--danger-hover);
	transform: var(--lift);
	box-shadow: var(--shadow-button);
}

.reset-settings-btn:active {
	transform: translateY(0);
}

@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing);
    }
    
    .settings-panel {
        grid-column: 1 / -1;
        margin-top: var(--spacing);
    }
    
    .preset-panel {
        grid-column: 1 / -1;
        margin-top: var(--spacing);
    }
    
    .brush-controls {
        padding: var(--spacing);
        background: var(--bg-light);
        border-radius: var(--radius);
        border: 1px solid var(--border-light);
    }
}@media (max-width: 768px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: var(--spacing);
    }
    
    .settings-panel {
        grid-column: 1;
        margin-top: 0;
    }
    
    .preset-panel {
        grid-column: 1;
        margin-top: 0;
    }
    
    .drop-zone {
        max-width: var(--canvas-max-mobile);
        height: var(--canvas-max-mobile);
    }
    
    #recreationCanvas {
        max-width: var(--canvas-max-mobile);
    }
    
    .stats {
        grid-template-columns: 1fr;
        gap: var(--spacing);
    }
    
    .controls {
        flex-direction: column;
    }
    
    .brush-controls {
        margin-top: 0;
        padding: var(--spacing);
        background: var(--bg-light);
        border-radius: var(--radius);
        border: 1px solid var(--border-light);
    }
    
    .range-controls {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .range-label {
        min-width: auto;
        text-align: left;
    }
}