/* Language Switcher */
        .lang-switcher {
            position: relative;
            display: inline-block;
        }
        .lang-switcher select {
            appearance: none; -webkit-appearance: none;
            background: transparent;
            border: 1px solid var(--border-color, #e5e7eb);
            border-radius: 6px;
            padding: 0.375rem 2rem 0.375rem 0.75rem;
            font-size: 0.875rem;
            color: var(--text-color, #374151);
            cursor: pointer; outline: none;
            transition: border-color 0.2s;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
            background-repeat: no-repeat; background-position: right 0.5rem center;
            background-size: 12px; min-width: 120px;
        }
        html[data-theme="dark"] .lang-switcher select {
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%239CA3AF' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
        }
        .lang-switcher select:hover { border-color: var(--primary-color, #2563eb); }
        [dir="rtl"] .lang-switcher select {
            background-position: left 0.5rem center;
            padding: 0.375rem 0.75rem 0.375rem 2rem;
        }

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

        :root {
            /* Light mode (default) */
            --bg-primary: #ffffff;
            --bg-secondary: #f3f4f6;
            --bg-tertiary: #e5e7eb;
            --text-primary: #1f2937;
            --text-secondary: #6b7280;
            --text-disabled: #9ca3af;
            --accent: #FF4500;
            --accent-hover: #FF5722;
            --border: #e5e7eb;
            --border-hover: #d1d5db;
            --success: #4CAF50;
            --radius: 8px;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.15);
            --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        .container {
            max-width: 1600px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header */
        header {
            background: rgba(255, 255, 255, 0.95);
            border-bottom: 1px solid var(--border);
            padding: 0.75rem 0;
        }

        .header-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            text-decoration: none;
            color: var(--text-primary);
        }

        .logo-icon {
            width: 32px;
            height: 32px;
        }

        .logo-text {
            font-family: 'Space Grotesk', sans-serif;
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.02em;
        }

        .logo-accent {
            font-family: 'Inter', sans-serif;
            color: var(--accent);
        }

        nav {
            display: flex;
            gap: 1.5rem;
        }

        nav a {
            color: var(--text-secondary);
            text-decoration: none;
            font-weight: 500;
            font-size: 0.9rem;
            transition: var(--transition);
        }

        nav a:hover {
            color: var(--accent);
        }

        /* Toolbar */
        .toolbar {
            background: var(--bg-secondary);
            border-bottom: 1px solid var(--border);
            padding: 0.75rem 0;
            position: sticky;
            top: 0;
            z-index: 90;
            overflow-x: auto;
        }

        .toolbar-content {
            display: flex;
            align-items: center;
            gap: 1.5rem;
            flex-wrap: wrap;
        }

        .toolbar-group {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            padding-right: 1.5rem;
            border-right: 1px solid var(--border);
        }

        .toolbar-group:last-child {
            border-right: none;
        }

        .toolbar-label {
            font-size: 0.7rem;
            font-weight: 600;
            color: var(--text-secondary);
            text-transform: uppercase;
            letter-spacing: 0.05em;
            white-space: nowrap;
        }

        .toolbar-control {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .btn-sm {
            padding: 0.5rem 0.75rem;
            font-size: 0.8rem;
            border: none;
            border-radius: var(--radius);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            white-space: nowrap;
        }

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

        .btn-primary:hover:not(:disabled) {
            background: var(--accent-hover);
            transform: translateY(-1px);
        }

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

        .btn-secondary:hover:not(:disabled) {
            background: var(--border);
            border-color: var(--text-secondary);
        }

        .btn-sm:disabled {
            opacity: 0.4;
            cursor: not-allowed;
        }

        .slider-sm {
            width: 80px;
            height: 6px;
            -webkit-appearance: none;
            appearance: none;
            background: var(--bg-tertiary);
            border-radius: 3px;
            outline: none;
            cursor: pointer;
        }

        .slider-sm::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 14px;
            height: 14px;
            background: var(--accent);
            border-radius: 50%;
            cursor: pointer;
            transition: var(--transition);
        }

        .slider-sm::-webkit-slider-thumb:hover {
            transform: scale(1.2);
        }

        .slider-sm::-moz-range-thumb {
            width: 14px;
            height: 14px;
            background: var(--accent);
            border: none;
            border-radius: 50%;
            cursor: pointer;
            transition: var(--transition);
        }

        .slider-sm::-moz-range-thumb:hover {
            transform: scale(1.2);
        }

        .value-sm {
            min-width: 35px;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--accent);
            text-align: left;
        }

        .select-sm {
            padding: 0.4rem 0.6rem;
            background: var(--bg-tertiary);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            color: var(--text-primary);
            font-size: 0.8rem;
            cursor: pointer;
            transition: var(--transition);
        }

        .select-sm:focus {
            outline: none;
            border-color: var(--accent);
        }

        .color-picker-sm {
            width: 28px;
            height: 28px;
            padding: 0;
            border: 2px solid var(--border);
            border-radius: var(--radius);
            cursor: pointer;
            background: none;
        }

        .color-picker-sm::-webkit-color-swatch-wrapper {
            padding: 0;
        }

        .color-picker-sm::-webkit-color-swatch {
            border: none;
            border-radius: 4px;
        }

        .input-sm {
            width: 60px;
            padding: 0.4rem 0.5rem;
            background: var(--bg-tertiary);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            color: var(--text-primary);
            font-size: 0.8rem;
            text-align: center;
        }

        .input-sm:focus {
            outline: none;
            border-color: var(--accent);
        }

        .input-sm:disabled {
            opacity: 0.4;
            cursor: not-allowed;
        }

        .checkbox-sm {
            width: 16px;
            height: 16px;
            accent-color: var(--accent);
            cursor: pointer;
        }

        .checkbox-label {
            display: flex;
            align-items: center;
            gap: 0.35rem;
            font-size: 0.8rem;
            font-weight: 500;
            color: var(--text-primary);
            cursor: pointer;
            white-space: nowrap;
        }

        /* Metric Toggle Group (Segmented Control) */
        .metric-toggle-group {
            display: flex;
            gap: 0;
        }

        .metric-toggle {
            border-radius: 0;
            margin: 0;
            padding: 0.5rem 0.75rem;
            font-size: 0.75rem;
            border: 1px solid var(--border);
            transition: var(--transition);
        }

        .metric-toggle:first-child {
            border-radius: var(--radius) 0 0 var(--radius);
        }

        .metric-toggle:last-child {
            border-radius: 0 var(--radius) var(--radius) 0;
        }

        .metric-toggle:not(:first-child) {
            border-left: none;
        }

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

        .metric-toggle.btn-secondary {
            background: var(--bg-tertiary);
            color: var(--text-primary);
            border-color: var(--border);
        }

        .metric-toggle:hover:not(.btn-primary) {
            background: var(--border);
        }

        /* Split View */
        .split-container {
            display: flex;
            position: relative;
            width: 100%;
            height: 100%;
        }

        .split-pane {
            flex: 1;
            overflow: hidden;
            position: relative;
        }

        .split-divider {
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 2px;
            height: 100%;
            background: var(--accent);
            z-index: 5;
            box-shadow: 0 0 8px rgba(255, 69, 0, 0.5);
        }

        /* Main Content Layout */
        .main-content {
            padding: 2rem 0;
        }

        .main-heading {
            font-size: 0.9rem;
            font-weight: 400;
            text-align: center;
            margin: 1rem 0;
            color: var(--text-secondary, #9ca3af);
        }

        .content-layout {
            display: flex;
            gap: 1.5rem;
            align-items: flex-start;
        }

        .canvas-column {
            flex: 1;
            min-width: 0;
        }

        .sidebar {
            width: 260px;
            flex-shrink: 0;
        }

        .sidebar h3 {
            font-size: 1.2rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--accent);
        }

        .sidebar .gallery-grid {
            grid-template-columns: 1fr;
            gap: 1rem;
        }

        .sidebar .gallery-item {
            box-shadow: var(--shadow);
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 8px;
            height: 72px;
        }

        .sidebar .gallery-item:hover {
            transform: translateX(4px);
            box-shadow: var(--shadow-lg);
        }

        .sidebar .gallery-image {
            width: 80px;
            height: 56px;
            flex-shrink: 0;
            border-radius: 4px;
        }

        .sidebar .gallery-info {
            flex: 1;
            min-width: 0;
            padding: 0;
        }

        .sidebar .gallery-title {
            font-size: 0.9rem;
            margin-bottom: 0.25rem;
        }

        .sidebar .gallery-params {
            font-size: 0.75rem;
        }

        /* Canvas Area */
        .canvas-area {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        #mainCanvas {
            max-width: 100%;
            height: auto;
            display: block;
            transform-origin: center center;
        }

        .canvas-wrapper {
            background: repeating-conic-gradient(#222 0% 25%, #2a2a2a 0% 50%) 50% / 20px 20px;
            border-radius: var(--radius);
            box-shadow: var(--shadow-lg);
            overflow: auto;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 450px;
            max-width: 100%;
        }

        .canvas-wrapper.grabbing {
            cursor: grabbing;
        }

        .canvas-wrapper canvas {
            transform-origin: center center;
            transition: transform 0.1s ease-out;
            max-width: none;
        }

        .canvas-placeholder {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 1rem;
            color: var(--text-disabled);
            text-align: center;
            padding: 2rem;
            cursor: pointer;
        }

        .placeholder-icon {
            width: 64px;
            height: 64px;
            opacity: 0.5;
        }

        .placeholder-text {
            font-size: 1rem;
            font-weight: 500;
        }

        .placeholder-hint {
            font-size: 0.85rem;
            color: var(--text-disabled);
        }

        .canvas-dimensions {
            position: absolute;
            bottom: 0.5rem;
            left: 0.5rem;
            background: rgba(0, 0, 0, 0.8);
            color: var(--text-secondary);
            padding: 0.35rem 0.6rem;
            border-radius: 4px;
            font-size: 0.75rem;
            font-weight: 500;
        }

        .canvas-download-btn {
            position: absolute;
            top: 0.5rem;
            right: 0.5rem;
            background: var(--accent);
            color: white;
            border: none;
            border-radius: var(--radius);
            padding: 0.4rem 0.75rem;
            font-size: 0.8rem;
            font-weight: 600;
            cursor: pointer;
            display: none;
            align-items: center;
            gap: 0.3rem;
            z-index: 10;
            transition: var(--transition);
            opacity: 0.9;
        }

        .canvas-download-btn svg {
            flex-shrink: 0;
        }

        .canvas-download-btn:hover {
            opacity: 1;
            transform: scale(1.05);
        }

        .canvas-wrapper:hover .canvas-download-btn {
            display: flex;
        }

        .processing-status {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background: rgba(0, 0, 0, 0.9);
            color: var(--text-primary);
            padding: 0.75rem 1.25rem;
            border-radius: var(--radius);
            font-weight: 500;
            font-size: 0.9rem;
            display: none;
            z-index: 10;
            animation: pulse 1.5s ease-in-out infinite;
        }

        @keyframes pulse {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.6; }
        }

        .processing-status.active {
            display: block;
        }

        .processing-status.loaded {
            animation: none;
            background: rgba(76, 175, 80, 0.9);
        }

        /* Zoom Controls */
        .zoom-controls {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            justify-content: center;
            padding: 0.75rem;
            background: var(--bg-secondary);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }

        .zoom-btn {
            padding: 0.4rem 0.8rem;
            background: var(--bg-tertiary);
            border: 1px solid var(--border);
            border-radius: 4px;
            color: var(--text-primary);
            font-size: 0.8rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }

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

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

        .zoom-label {
            min-width: 45px;
            text-align: center;
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--accent);
        }

        /* Hidden file input */
        #fileInput {
            display: none;
        }

        /* Example Gallery */