/* Modern CSS Reset and Base Styles */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            /* Light mode colors */
            --primary-50: #eff6ff;
            --primary-100: #dbeafe;
            --primary-200: #bfdbfe;
            --primary-300: #93c5fd;
            --primary-400: #60a5fa;
            --primary-500: #3b82f6;
            --primary-600: #2563eb;
            --primary-700: #1d4ed8;
            --primary-800: #1e40af;
            --primary-900: #1e3a8a;

            --gray-50: #f9fafb;
            --gray-100: #f3f4f6;
            --gray-200: #e5e7eb;
            --gray-300: #d1d5db;
            --gray-400: #9ca3af;
            --gray-500: #6b7280;
            --gray-600: #4b5563;
            --gray-700: #374151;
            --gray-800: #1f2937;
            --gray-900: #111827;

            --success-500: #10b981;
            --warning-500: #f59e0b;
            --error-500: #ef4444;

            /* Theme-aware colors - Light mode */
            --bg-primary: #f9fafb;
            --bg-secondary: #ffffff;
            --bg-tertiary: #f3f4f6;
            --text-primary: #111827;
            --text-secondary: #6b7280;
            --text-tertiary: #9ca3af;
            --border-color: #e5e7eb;
            --border-color-strong: #d1d5db;
            --shadow-color: rgba(0, 0, 0, 0.1);
            --shadow-color-strong: rgba(0, 0, 0, 0.2);
            --overlay-bg: rgba(255, 255, 255, 0.95);
            --input-bg: #ffffff;
            --canvas-bg: #ffffff;
            --preview-bg: #f9fafb;

            /* Spacing */
            --space-1: 0.25rem;
            --space-2: 0.5rem;
            --space-3: 0.75rem;
            --space-4: 1rem;
            --space-5: 1.25rem;
            --space-6: 1.5rem;
            --space-8: 2rem;
            --space-10: 2.5rem;
            --space-12: 3rem;
            --space-16: 4rem;
            --space-20: 5rem;

            /* Typography */
            --font-size-xs: 0.75rem;
            --font-size-sm: 0.875rem;
            --font-size-base: 1rem;
            --font-size-lg: 1.125rem;
            --font-size-xl: 1.25rem;
            --font-size-2xl: 1.5rem;
            --font-size-3xl: 1.875rem;
            --font-size-4xl: 2.25rem;

            /* Shadows */
            --shadow-sm: 0 1px 2px 0 var(--shadow-color);
            --shadow-md: 0 4px 6px -1px var(--shadow-color), 0 2px 4px -2px var(--shadow-color);
            --shadow-lg: 0 10px 15px -3px var(--shadow-color), 0 4px 6px -4px var(--shadow-color);
            --shadow-xl: 0 20px 25px -5px var(--shadow-color), 0 8px 10px -6px var(--shadow-color);

            /* Border Radius */
            --radius-sm: 0.25rem;
            --radius-md: 0.375rem;
            --radius-lg: 0.5rem;
            --radius-xl: 0.75rem;
            --radius-2xl: 1rem;

            /* Transitions */
            --transition-fast: 150ms ease-in-out;
            --transition-normal: 250ms ease-in-out;
            --transition-slow: 350ms ease-in-out;
        }

        /* Dark mode theme - Comprehensive updates */
        [data-theme="dark"] {
            --bg-primary: #0f172a;
            --bg-secondary: #1e293b;
            --bg-tertiary: #334155;
            --text-primary: #f1f5f9;
            --text-secondary: #cbd5e1;
            --text-tertiary: #94a3b8;
            --border-color: #334155;
            --border-color-strong: #475569;
            --shadow-color: rgba(0, 0, 0, 0.4);
            --shadow-color-strong: rgba(0, 0, 0, 0.6);
            --overlay-bg: rgba(15, 23, 42, 0.95);
            --input-bg: #1e293b;
            --canvas-bg: #1e293b;
            --preview-bg: #0f172a;

            /* Dark mode specific color overrides */
            --gray-50: #475569;
            --gray-100: #64748b;
            --gray-200: #94a3b8;
            --gray-300: #cbd5e1;
            --gray-400: #e2e8f0;
            --gray-500: #f1f5f9;
            --gray-600: #f8fafc;
            --gray-700: #ffffff;
            --gray-800: #ffffff;
            --gray-900: #ffffff;

            /* Enhanced primary colors for dark mode */
            --primary-50: #1e293b;
            --primary-100: #334155;
            --primary-200: #475569;
            --primary-300: #64748b;
            --primary-400: #94a3b8;
            --primary-500: #60a5fa;
            --primary-600: #3b82f6;
            --primary-700: #2563eb;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            transition: background var(--transition-normal), color var(--transition-normal);
        }

        /* App Layout */
        .app-container {
            display: flex;
            height: 100vh;
            overflow: hidden;
            background: var(--bg-primary);
        }

        /* Sidebar Navigation - Enhanced with darker blue background for light mode */
        .sidebar {
            width: 280px;
            background: linear-gradient(180deg, var(--primary-800) 0%, var(--primary-900) 100%);
            border-right: 1px solid var(--primary-700);
            display: flex;
            flex-direction: column;
            position: relative;
            box-shadow: var(--shadow-xl);
            transition: all var(--transition-normal);
        }

        [data-theme="dark"] .sidebar {
            background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
            border-right-color: var(--border-color-strong);
            border-right: 1px solid var(--border-color);
        }

        .sidebar-header {
            padding: var(--space-6);
            border-bottom: 1px solid rgba(255, 255, 255, 0.15);
            background: var(--primary-900);
            transition: all var(--transition-normal);
        }

        [data-theme="dark"] .sidebar-header {
            border-bottom-color: var(--border-color-strong);
            background: var(--bg-tertiary);
            border-bottom: 1px solid var(--border-color);
        }

        .logo {
            display: flex;
            align-items: center;
            gap: var(--space-3);
            color: white;
            font-size: var(--font-size-xl);
            font-weight: 700;
            transition: color var(--transition-normal);
        }

        [data-theme="dark"] .logo {
            color: var(--text-primary);
        }

        .logo i {
            color: var(--primary-200);
            font-size: var(--font-size-2xl);
        }

        [data-theme="dark"] .logo i {
            color: var(--primary-500);
        }

        .nav-items {
            flex: 1;
            padding: var(--space-4);
            background: var(--primary-800);
            transition: background var(--transition-normal);
        }

        [data-theme="dark"] .nav-items {
            background: var(--bg-secondary);
        }

        .nav-item {
            display: flex;
            align-items: center;
            gap: var(--space-3);
            padding: var(--space-4);
            margin-bottom: var(--space-2);
            border-radius: var(--radius-lg);
            color: rgba(255, 255, 255, 0.8);
            cursor: pointer;
            transition: all var(--transition-normal);
            position: relative;
            overflow: hidden;
        }

        [data-theme="dark"] .nav-item {
            color: var(--text-secondary);
        }

        .nav-item:hover {
            background: rgba(255, 255, 255, 0.1);
            color: white;
            transform: translateX(4px);
        }

        [data-theme="dark"] .nav-item:hover {
            background: rgba(100, 116, 139, 0.2);
            color: var(--text-primary);
        }

        .nav-item.active {
            background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-700) 100%);
            color: white;
            box-shadow: var(--shadow-md);
        }

        .nav-item.active::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, transparent 100%);
            pointer-events: none;
        }

        [data-theme="dark"] .nav-item.active {
            background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
            box-shadow: 0 4px 14px 0 rgba(96, 165, 250, 0.3);
        }

        .nav-item i {
            font-size: var(--font-size-lg);
            width: 20px;
            text-align: center;
        }

        .nav-item span {
            font-weight: 500;
        }

        .nav-indicator {
            display: none;
        }

        /* Main Content */
        .main-content {
            flex: 1;
            overflow: hidden;
            display: flex;
            flex-direction: column;
            position: relative;
            background: var(--bg-primary);
            transition: background var(--transition-normal);
        }

        /* Dark Mode Toggle - Enhanced styling */
        .dark-mode-toggle {
            position: absolute;
            top: var(--space-4);
            right: var(--space-4);
            z-index: 1000;
        }

        .dark-mode-btn {
            background: var(--bg-secondary);
            border: 2px solid var(--border-color);
            width: 48px;
            height: 48px;
            border-radius: 50%;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: var(--font-size-lg);
            color: var(--text-secondary);
            transition: all var(--transition-fast);
            box-shadow: var(--shadow-md);
        }

        .dark-mode-btn:hover {
            background: var(--bg-tertiary);
            border-color: var(--primary-400);
            color: var(--primary-500);
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }

        [data-theme="dark"] .dark-mode-btn {
            background: var(--bg-tertiary);
            border-color: var(--border-color-strong);
            color: var(--text-tertiary);
        }

        [data-theme="dark"] .dark-mode-btn:hover {
            background: var(--bg-secondary);
            border-color: var(--primary-400);
            color: var(--primary-400);
            box-shadow: 0 8px 25px -5px rgba(96, 165, 250, 0.3);
        }

        .page {
            display: none;
            flex: 1;
            overflow: auto;
            padding: var(--space-8);
            animation: fadeIn 0.3s ease-in-out;
            background: var(--bg-primary);
            transition: background var(--transition-normal);
        }

        .page.active {
            display: flex;
            flex-direction: column;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .page-header {
            margin-bottom: var(--space-8);
        }

        .page-header h1 {
            font-size: var(--font-size-3xl);
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: var(--space-2);
            transition: color var(--transition-normal);
        }

        .page-header p {
            font-size: var(--font-size-lg);
            color: var(--text-secondary);
            margin-bottom: var(--space-4);
            transition: color var(--transition-normal);
        }

        /* Help Button */
        .help-button {
            background: linear-gradient(135deg, var(--success-500) 0%, #059669 100%);
            color: white;
            border: none;
            padding: var(--space-3) var(--space-6);
            border-radius: var(--radius-lg);
            font-size: var(--font-size-base);
            font-weight: 600;
            cursor: pointer;
            transition: all var(--transition-fast);
            display: inline-flex;
            align-items: center;
            gap: var(--space-2);
            box-shadow: var(--shadow-md);
        }

        .help-button:hover {
            background: linear-gradient(135deg, #059669 0%, #047857 100%);
            transform: translateY(-1px);
            box-shadow: var(--shadow-lg);
        }

        [data-theme="dark"] .help-button:hover {
            box-shadow: 0 8px 25px -5px rgba(16, 185, 129, 0.4);
        }

        /* Form Elements - Enhanced dark mode */
        .form-group {
            margin-bottom: var(--space-6);
        }

        .form-group label {
            display: block;
            font-size: var(--font-size-sm);
            font-weight: 600;
            color: var(--text-secondary);
            margin-bottom: var(--space-2);
            transition: color var(--transition-normal);
        }

        .form-input {
            width: 100%;
            padding: var(--space-3) var(--space-4);
            border: 2px solid var(--border-color);
            border-radius: var(--radius-lg);
            font-size: var(--font-size-base);
            transition: all var(--transition-fast);
            background: var(--input-bg);
            color: var(--text-primary);
        }

        .form-input:focus {
            outline: none;
            border-color: var(--primary-500);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
        }

        [data-theme="dark"] .form-input:focus {
            box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.2);
        }

        .checkbox-group {
            display: flex;
            align-items: center;
            gap: var(--space-3);
        }

        .checkbox-group input[type="checkbox"] {
            width: 18px;
            height: 18px;
            accent-color: var(--primary-500);
            cursor: pointer;
        }

        .checkbox-group label {
            margin: 0;
            cursor: pointer;
            font-weight: 500;
            color: var(--text-primary);
            transition: color var(--transition-normal);
        }

        /* Buttons - Enhanced dark mode */
        .btn-primary {
            background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-700) 100%);
            color: white;
            border: none;
            padding: var(--space-3) var(--space-6);
            border-radius: var(--radius-lg);
            font-size: var(--font-size-base);
            font-weight: 600;
            cursor: pointer;
            transition: all var(--transition-fast);
            display: flex;
            align-items: center;
            gap: var(--space-2);
            box-shadow: var(--shadow-sm);
        }

        .btn-primary:hover {
            background: linear-gradient(135deg, var(--primary-700) 0%, var(--primary-800) 100%);
            box-shadow: var(--shadow-md);
            transform: translateY(-1px);
        }

        [data-theme="dark"] .btn-primary:hover {
            box-shadow: 0 8px 25px -5px rgba(96, 165, 250, 0.4);
        }

        .btn-secondary {
            background: var(--bg-secondary);
            color: var(--text-secondary);
            border: 2px solid var(--border-color);
            padding: var(--space-2) var(--space-4);
            border-radius: var(--radius-lg);
            font-size: var(--font-size-sm);
            font-weight: 500;
            cursor: pointer;
            transition: all var(--transition-fast);
            display: flex;
            align-items: center;
            gap: var(--space-2);
        }

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

        /* Sliders - Enhanced dark mode */
        .slider-container {
            display: flex;
            align-items: center;
            gap: var(--space-4);
        }

        .slider-container span {
            font-size: var(--font-size-sm);
            color: var(--text-tertiary);
            font-weight: 500;
            min-width: 30px;
            text-align: center;
            transition: color var(--transition-normal);
        }

        .slider {
            flex: 1;
            height: 6px;
            background: var(--border-color);
            border-radius: var(--radius-lg);
            outline: none;
            cursor: pointer;
            transition: all var(--transition-fast);
        }

        [data-theme="dark"] .slider {
            background: var(--border-color-strong);
        }

        .slider::-webkit-slider-thumb {
            appearance: none;
            width: 20px;
            height: 20px;
            background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
            border-radius: 50%;
            cursor: pointer;
            box-shadow: var(--shadow-md);
            transition: all var(--transition-fast);
        }

        .slider::-webkit-slider-thumb:hover {
            background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-700) 100%);
            transform: scale(1.1);
        }

        [data-theme="dark"] .slider::-webkit-slider-thumb:hover {
            box-shadow: 0 4px 14px 0 rgba(96, 165, 250, 0.4);
        }

        .slider::-moz-range-thumb {
            width: 20px;
            height: 20px;
            background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
            border-radius: 50%;
            cursor: pointer;
            border: none;
            box-shadow: var(--shadow-md);
        }

        /* Control Sections - Enhanced dark mode */
        .control-section {
            background: var(--bg-secondary);
            padding: var(--space-6);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            margin-bottom: var(--space-6);
            transition: all var(--transition-normal);
        }

        [data-theme="dark"] .control-section {
            background: var(--bg-secondary);
            border-color: var(--border-color-strong);
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
        }

        .control-section h3 {
            font-size: var(--font-size-lg);
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: var(--space-4);
            padding-bottom: var(--space-2);
            border-bottom: 2px solid var(--border-color);
            transition: all var(--transition-normal);
        }

        /* Import Page - Enhanced dark mode */
        .import-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-8);
            flex: 1;
            align-items: start;
        }

        .drop-zone {
            background: var(--bg-secondary);
            border: 3px dashed var(--border-color-strong);
            border-radius: var(--radius-2xl);
            padding: var(--space-16);
            text-align: center;
            cursor: pointer;
            transition: all var(--transition-normal);
            position: relative;
            overflow: hidden;
        }

        [data-theme="dark"] .drop-zone {
            background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
            border-color: var(--border-color-strong);
        }

        .drop-zone::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(135deg, rgba(59, 130, 246, 0.05) 0%, rgba(147, 197, 253, 0.05) 100%);
            opacity: 0;
            transition: opacity var(--transition-normal);
        }

        [data-theme="dark"] .drop-zone::before {
            background: linear-gradient(135deg, rgba(96, 165, 250, 0.1) 0%, rgba(59, 130, 246, 0.1) 100%);
        }

        .drop-zone:hover::before,
        .drop-zone.dragover::before {
            opacity: 1;
        }

        .drop-zone:hover {
            border-color: var(--primary-400);
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }

        [data-theme="dark"] .drop-zone:hover {
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
        }

        .drop-zone.dragover {
            border-color: var(--primary-500);
            background: var(--bg-tertiary);
        }

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

        .drop-icon {
            margin: 0 auto var(--space-6);
            width: 80px;
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
            border-radius: 50%;
            color: white;
            font-size: var(--font-size-3xl);
            box-shadow: var(--shadow-lg);
        }

        .drop-zone h3 {
            font-size: var(--font-size-xl);
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: var(--space-2);
            transition: color var(--transition-normal);
        }

        .drop-zone p {
            color: var(--text-secondary);
            margin-bottom: var(--space-6);
            transition: color var(--transition-normal);
        }

        .browse-btn {
            background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--text-secondary) 100%);
            color: var(--text-primary);
            border: none;
            padding: var(--space-4) var(--space-8);
            border-radius: var(--radius-lg);
            font-size: var(--font-size-base);
            font-weight: 600;
            cursor: pointer;
            transition: all var(--transition-fast);
            display: inline-flex;
            align-items: center;
            gap: var(--space-2);
            box-shadow: var(--shadow-md);
        }

        .browse-btn:hover {
            background: linear-gradient(135deg, var(--text-secondary) 0%, var(--text-primary) 100%);
            transform: translateY(-1px);
            box-shadow: var(--shadow-lg);
        }

        [data-theme="dark"] .browse-btn {
            background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--border-color-strong) 100%);
            color: var(--text-primary);
        }

        [data-theme="dark"] .browse-btn:hover {
            background: linear-gradient(135deg, var(--border-color-strong) 0%, var(--text-tertiary) 100%);
        }

        .preview-container {
            background: var(--bg-secondary);
            border-radius: var(--radius-xl);
            padding: var(--space-6);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: all var(--transition-normal);
        }

        .preview-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: var(--space-4);
            padding-bottom: var(--space-3);
            border-bottom: 1px solid var(--border-color);
            transition: border-color var(--transition-normal);
        }

        .preview-header h3 {
            font-size: var(--font-size-lg);
            font-weight: 600;
            color: var(--text-primary);
            transition: color var(--transition-normal);
        }

        .imported-image {
            width: 100%;
            max-height: 400px;
            object-fit: contain;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
        }

        /* Edit Page - Enhanced dark mode */
        .edit-layout {
            display: grid;
            grid-template-columns: 400px 1fr;
            gap: var(--space-8);
            flex: 1;
            height: 100%;
        }

        .controls-panel {
            overflow-y: auto;
            max-height: calc(100vh - 200px);
            padding-right: var(--space-2);
        }

        .controls-panel::-webkit-scrollbar {
            width: 6px;
        }

        .controls-panel::-webkit-scrollbar-track {
            background: var(--border-color);
            border-radius: var(--radius-lg);
        }

        .controls-panel::-webkit-scrollbar-thumb {
            background: var(--text-tertiary);
            border-radius: var(--radius-lg);
        }

        .controls-panel::-webkit-scrollbar-thumb:hover {
            background: var(--text-secondary);
        }

        .threshold-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-4);
        }

        .threshold-stack {
            display: flex;
            flex-direction: column;
            gap: var(--space-4);
        }

        .margin-controls {
            margin-top: var(--space-4);
        }

        .margin-grid {
            display: grid;
            grid-template-columns: 1fr 80px 1fr;
            grid-template-rows: 80px 80px 80px;
            gap: var(--space-2);
            align-items: center;
            justify-items: center;
        }

        .margin-input {
            width: 70px;
            padding: var(--space-2);
            border: 2px solid var(--border-color);
            border-radius: var(--radius-md);
            text-align: center;
            font-size: var(--font-size-sm);
            font-weight: 500;
            transition: all var(--transition-fast);
            background: var(--input-bg);
            color: var(--text-primary);
        }

        .margin-input:focus {
            outline: none;
            border-color: var(--primary-500);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
        }

        [data-theme="dark"] .margin-input:focus {
            box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.2);
        }

        .margin-center {
            background: var(--bg-tertiary);
            border: 2px dashed var(--border-color-strong);
            border-radius: var(--radius-md);
            width: 80px;
            height: 60px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: var(--font-size-sm);
            font-weight: 500;
            color: var(--text-tertiary);
            transition: all var(--transition-normal);
        }

        .preview-area {
            display: flex;
            flex-direction: column;
            height: 100%;
        }

        .image-preview-container {
            background: var(--canvas-bg);
            border-radius: var(--radius-xl);
            padding: var(--space-6);
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--border-color);
            flex: 1;
            display: flex;
            flex-direction: column;
            overflow: hidden;
            transition: all var(--transition-normal);
        }

        .image-preview {
            flex: 1;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-lg);
            border: 2px dashed var(--border-color);
            position: relative;
            overflow: hidden;
            min-height: 400px;
            transition: border-color var(--transition-normal);
        }

        .image-preview img {
            width: 100%;
            height: 100%;
            object-fit: contain;
            border-radius: var(--radius-md);
            /* Sharp pixel rendering */
            image-rendering: pixelated;
            image-rendering: -moz-crisp-edges;
            image-rendering: crisp-edges;
        }

        .image-preview img:not([src=""]) + .preview-placeholder {
            display: none;
        }

        .preview-placeholder {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            text-align: center;
            color: var(--text-tertiary);
            pointer-events: none;
            transition: color var(--transition-normal);
        }

        .preview-placeholder i {
            font-size: var(--font-size-4xl);
            margin-bottom: var(--space-4);
            color: var(--text-tertiary);
        }

        .preview-placeholder p {
            font-size: var(--font-size-base);
            font-weight: 500;
        }

        /* Touchup Page - Enhanced dark mode */
        .touchup-layout {
            display: grid;
            grid-template-columns: 300px 1fr;
            gap: var(--space-8);
            flex: 1;
            height: 100%;
        }

        .touchup-controls {
            display: flex;
            flex-direction: column;
            gap: var(--space-6);
        }

        .stat-card {
            background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
            color: white;
            padding: var(--space-6);
            border-radius: var(--radius-lg);
            text-align: center;
            box-shadow: var(--shadow-md);
            transition: all var(--transition-normal);
        }

        [data-theme="dark"] .stat-card {
            box-shadow: 0 4px 14px 0 rgba(96, 165, 250, 0.3);
        }

        .stat-value {
            font-size: var(--font-size-4xl);
            font-weight: 700;
            margin-bottom: var(--space-2);
        }

        .stat-label {
            font-size: var(--font-size-sm);
            opacity: 0.9;
            font-weight: 500;
        }

        .tool-info {
            display: flex;
            flex-direction: column;
            gap: var(--space-3);
        }

        .tool-item {
            display: flex;
            align-items: center;
            gap: var(--space-3);
            padding: var(--space-3);
            background: var(--bg-tertiary);
            border-radius: var(--radius-md);
            font-size: var(--font-size-sm);
            color: var(--text-secondary);
            transition: all var(--transition-normal);
        }

        .tool-item i {
            color: var(--primary-500);
            width: 16px;
        }

        .canvas-area {
            display: flex;
            flex-direction: column;
            height: 100%;
        }

        .canvas-container {
            background: var(--canvas-bg);
            border-radius: var(--radius-xl);
            padding: var(--space-6);
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--border-color);
            flex: 1;
            display: flex;
            flex-direction: column;
            overflow: hidden;
            min-height: 400px;
            transition: all var(--transition-normal);
            position: relative;
        }

        .canvas-container canvas {
            flex: 1;
            width: 100%;
            height: 100%;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            cursor: crosshair;
            object-fit: contain;
            /* Sharp pixel rendering */
            image-rendering: pixelated;
            image-rendering: -moz-crisp-edges;
            image-rendering: crisp-edges;
            background: var(--canvas-bg);
        }

        .canvas-placeholder {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            text-align: center;
            color: var(--text-tertiary);
            pointer-events: none;
            transition: color var(--transition-normal);
        }

        .canvas-placeholder i {
            font-size: var(--font-size-4xl);
            margin-bottom: var(--space-4);
            color: var(--text-tertiary);
        }

        .canvas-placeholder p {
            font-size: var(--font-size-base);
            font-weight: 500;
        }

        /* Preview Page - Enhanced dark mode */
        .preview-layout {
            display: grid;
            grid-template-columns: 300px 1fr;
            gap: var(--space-8);
            flex: 1;
            height: 100%;
            overflow: hidden;
        }

        .preview-controls {
            display: flex;
            flex-direction: column;
            gap: var(--space-6);
            overflow-y: auto;
            max-height: 100%;
            padding-right: var(--space-2);
        }

        .preview-controls::-webkit-scrollbar {
            width: 6px;
        }

        .preview-controls::-webkit-scrollbar-track {
            background: var(--border-color);
            border-radius: var(--radius-lg);
        }

        .preview-controls::-webkit-scrollbar-thumb {
            background: var(--text-tertiary);
            border-radius: var(--radius-lg);
        }

        .preview-controls::-webkit-scrollbar-thumb:hover {
            background: var(--text-secondary);
        }

        .spacing-value {
            text-align: center;
            margin-top: var(--space-2);
            font-size: var(--font-size-sm);
            font-weight: 600;
            color: var(--primary-500);
            transition: color var(--transition-normal);
        }

        /* Instructions Page - Enhanced dark mode */
        .instructions-layout {
            display: grid;
            grid-template-columns: 350px 1fr;
            gap: var(--space-8);
            flex: 1;
        }

        .export-section {
            display: flex;
            flex-direction: column;
            gap: var(--space-6);
        }

        .instructions-display {
            background: var(--bg-secondary);
            border-radius: var(--radius-xl);
            padding: var(--space-8);
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            transition: all var(--transition-normal);
        }

        .pattern-headers {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-4);
            margin-bottom: var(--space-8);
            padding-bottom: var(--space-4);
            border-bottom: 2px solid var(--border-color);
            transition: border-color var(--transition-normal);
        }

        .pattern-header h3 {
            text-align: center;
            font-size: var(--font-size-xl);
            font-weight: 600;
            color: var(--text-primary);
            transition: color var(--transition-normal);
        }

        .instruction-rows {
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
            gap: var(--space-6);
        }

        .instruction-row {
            display: grid;
            grid-template-columns: 100px 1fr 1fr;
            gap: var(--space-6);
            align-items: center;
            padding: var(--space-4) 0;
            border-bottom: 1px solid var(--border-color);
            transition: all var(--transition-normal);
        }

        .instruction-row.current-row {
            background: linear-gradient(135deg, var(--primary-50) 0%, var(--bg-secondary) 100%);
            border-radius: var(--radius-lg);
            padding: var(--space-6);
            border: 2px solid var(--primary-300);
            box-shadow: var(--shadow-md);
            border-bottom: 2px solid var(--primary-300);
        }

        [data-theme="dark"] .instruction-row.current-row {
            background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
            border-color: var(--primary-400);
            box-shadow: 0 4px 14px 0 rgba(96, 165, 250, 0.2);
        }

        .page-info {
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .page-number {
            font-size: var(--font-size-lg);
            font-weight: 600;
            color: var(--text-secondary);
            background: var(--bg-tertiary);
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all var(--transition-normal);
        }

        .page-number.current {
            background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
            color: white;
            font-size: var(--font-size-xl);
            width: 50px;
            height: 50px;
            box-shadow: var(--shadow-md);
        }

        [data-theme="dark"] .page-number.current {
            box-shadow: 0 4px 14px 0 rgba(96, 165, 250, 0.4);
        }

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

        .measurement {
            font-size: var(--font-size-2xl);
            font-weight: 600;
            color: var(--text-secondary);
            background: var(--bg-tertiary);
            padding: var(--space-4) var(--space-6);
            border-radius: var(--radius-lg);
            display: inline-block;
            min-width: 100px;
            transition: all var(--transition-normal);
        }

        .measurement.current {
            font-size: var(--font-size-4xl);
            font-weight: 700;
            color: var(--primary-600);
            background: linear-gradient(135deg, var(--primary-50) 0%, var(--bg-secondary) 100%);
            border: 2px solid var(--primary-300);
            box-shadow: var(--shadow-sm);
        }

        [data-theme="dark"] .measurement.current {
            color: var(--primary-400);
            background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
            border-color: var(--primary-400);
            box-shadow: 0 2px 8px 0 rgba(96, 165, 250, 0.2);
        }

        .playback-controls {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: var(--space-4);
            margin-top: var(--space-8);
            padding-top: var(--space-6);
            border-top: 2px solid var(--border-color);
            transition: border-color var(--transition-normal);
        }

        .control-btn {
            background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
            border: 2px solid var(--border-color);
            width: 60px;
            height: 60px;
            border-radius: 50%;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: var(--font-size-lg);
            color: var(--text-secondary);
            transition: all var(--transition-fast);
            box-shadow: var(--shadow-sm);
        }

        .control-btn:hover {
            background: linear-gradient(135deg, var(--primary-50) 0%, var(--bg-secondary) 100%);
            border-color: var(--primary-400);
            color: var(--primary-500);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        [data-theme="dark"] .control-btn:hover {
            background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
            color: var(--primary-400);
            box-shadow: 0 4px 14px 0 rgba(96, 165, 250, 0.2);
        }

        .play-pause-btn {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
            color: white;
            border-color: var(--primary-600);
            font-size: var(--font-size-xl);
        }

        .play-pause-btn:hover {
            background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-700) 100%);
            border-color: var(--primary-700);
            color: white;
        }

        [data-theme="dark"] .play-pause-btn:hover {
            box-shadow: 0 8px 25px -5px rgba(96, 165, 250, 0.4);
        }

        /* Modal Styles */
        .instructions-modal,
        .folding-modal,
        .terms-modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.8);
            z-index: 10000;
            justify-content: center;
            align-items: center;
            padding: var(--space-4);
        }

        .instructions-modal-content,
        .folding-modal-content,
        .terms-modal-content {
            background: var(--bg-secondary);
            border-radius: var(--radius-2xl);
            box-shadow: var(--shadow-xl);
            width: 100%;
            max-width: 600px;
            max-height: 80vh;
            display: flex;
            flex-direction: column;
            border: 1px solid var(--border-color);
            overflow: hidden;
        }

        .instructions-modal-content {
            max-width: 900px;
        }

        .folding-modal-content {
            max-width: 700px;
        }

        .terms-modal-content {
            max-width: 800px;
            max-height: 90vh;
        }

        .instructions-header,
        .folding-header,
        .terms-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: var(--space-6);
            border-bottom: 1px solid var(--border-color);
            flex-shrink: 0;
        }

        .terms-header {
            justify-content: center;
            background: linear-gradient(135deg, var(--primary-50) 0%, var(--bg-secondary) 100%);
        }

        [data-theme="dark"] .terms-header {
            background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
        }

        .instructions-header h2,
        .folding-header h2,
        .terms-header h2 {
            font-size: var(--font-size-2xl);
            font-weight: 700;
            color: var(--text-primary);
        }

        .instructions-body,
        .folding-body,
        .terms-body {
            padding: var(--space-6);
            overflow-y: auto;
            flex: 1;
        }

        .terms-body {
            padding: var(--space-8);
            line-height: 1.8;
        }

        .terms-body h3 {
            color: var(--primary-600);
            font-size: var(--font-size-lg);
            font-weight: 600;
            margin-top: var(--space-6);
            margin-bottom: var(--space-3);
        }

        [data-theme="dark"] .terms-body h3 {
            color: var(--primary-400);
        }

        .terms-body p {
            color: var(--text-secondary);
            margin-bottom: var(--space-4);
        }

        .terms-body ul {
            list-style-type: disc;
            margin-left: var(--space-6);
            margin-bottom: var(--space-4);
        }

        .terms-body li {
            color: var(--text-secondary);
            margin-bottom: var(--space-2);
        }

        .terms-body a {
            color: var(--primary-500);
            text-decoration: none;
        }

        .terms-body a:hover {
            text-decoration: underline;
        }

        [data-theme="dark"] .terms-body a {
            color: var(--primary-400);
        }

        .terms-notice {
            background: var(--primary-50);
            padding: var(--space-4);
            border-radius: var(--radius-lg);
            margin-top: var(--space-6);
            border-left: 4px solid var(--primary-500);
        }

        [data-theme="dark"] .terms-notice {
            background: var(--bg-tertiary);
            border-left-color: var(--primary-400);
        }

        .terms-footer {
            padding: var(--space-6);
            border-top: 1px solid var(--border-color);
            display: flex;
            justify-content: center;
            gap: var(--space-4);
            flex-shrink: 0;
            background: var(--bg-tertiary);
        }

        [data-theme="dark"] .terms-footer {
            background: var(--bg-tertiary);
        }

        .instructions-body::-webkit-scrollbar,
        .folding-body::-webkit-scrollbar,
        .terms-body::-webkit-scrollbar {
            width: 8px;
        }

        .instructions-body::-webkit-scrollbar-track,
        .folding-body::-webkit-scrollbar-track,
        .terms-body::-webkit-scrollbar-track {
            background: var(--bg-tertiary);
            border-radius: var(--radius-lg);
        }

        .instructions-body::-webkit-scrollbar-thumb,
        .folding-body::-webkit-scrollbar-thumb,
        .terms-body::-webkit-scrollbar-thumb {
            background: var(--border-color-strong);
            border-radius: var(--radius-lg);
        }

        .instructions-body::-webkit-scrollbar-thumb:hover,
        .folding-body::-webkit-scrollbar-thumb:hover,
        .terms-body::-webkit-scrollbar-thumb:hover {
            background: var(--text-tertiary);
        }

        /* Instructions Modal Content */
        .instructions-overview,
        .folding-overview {
            background: var(--primary-50);
            padding: var(--space-6);
            border-radius: var(--radius-lg);
            margin-bottom: var(--space-8);
            border-left: 4px solid var(--primary-500);
        }

        [data-theme="dark"] .instructions-overview,
        [data-theme="dark"] .folding-overview {
            background: var(--bg-tertiary);
            border-left-color: var(--primary-400);
        }

        .folding-overview h3 {
            color: var(--text-primary);
            font-size: var(--font-size-xl);
            font-weight: 600;
            margin: 0;
        }

        .materials-section {
            margin-bottom: var(--space-8);
            padding-bottom: var(--space-6);
            border-bottom: 1px solid var(--border-color);
        }

        .materials-section h4 {
            color: var(--primary-600);
            font-size: var(--font-size-lg);
            font-weight: 600;
            margin-bottom: var(--space-4);
            display: flex;
            align-items: center;
            gap: var(--space-3);
        }

        [data-theme="dark"] .materials-section h4 {
            color: var(--primary-400);
        }

        .materials-section ul {
            list-style-type: disc;
            margin-left: var(--space-6);
            margin-bottom: var(--space-4);
        }

        .materials-section li {
            margin-bottom: var(--space-2);
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .materials-section li.note {
            background: var(--warning-500);
            color: white;
            padding: var(--space-3);
            border-radius: var(--radius-md);
            list-style: none;
            margin-left: calc(-1 * var(--space-6));
            margin-bottom: var(--space-3);
            font-size: var(--font-size-sm);
        }

        .example-box {
            background: var(--bg-tertiary);
            padding: var(--space-4);
            border-radius: var(--radius-lg);
            margin: var(--space-4) 0;
            border-left: 4px solid var(--success-500);
        }

        .example-box h5 {
            color: var(--success-500);
            font-size: var(--font-size-base);
            font-weight: 600;
            margin-bottom: var(--space-2);
            display: flex;
            align-items: center;
            gap: var(--space-2);
        }

        .example-box p {
            color: var(--text-secondary);
            margin: 0;
            font-family: 'Courier New', monospace;
            font-size: var(--font-size-sm);
        }

        .step-section {
            margin-bottom: var(--space-8);
            padding-bottom: var(--space-6);
            border-bottom: 1px solid var(--border-color);
        }

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

        .step-section h3 {
            color: var(--primary-600);
            font-size: var(--font-size-xl);
            font-weight: 600;
            margin-bottom: var(--space-4);
            display: flex;
            align-items: center;
            gap: var(--space-3);
        }

        [data-theme="dark"] .step-section h3 {
            color: var(--primary-400);
        }

        .step-section h4 {
            color: var(--text-primary);
            font-size: var(--font-size-lg);
            font-weight: 600;
            margin: var(--space-6) 0 var(--space-3) 0;
        }

        .step-section ul {
            list-style-type: disc;
            margin-left: var(--space-6);
            margin-bottom: var(--space-4);
        }

        .step-section li {
            margin-bottom: var(--space-2);
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .step-section strong {
            color: var(--text-primary);
            font-weight: 600;
        }

        .tips-section,
        .troubleshooting-section,
        .contact-section {
            background: var(--bg-tertiary);
            padding: var(--space-6);
            border-radius: var(--radius-lg);
            margin-bottom: var(--space-6);
        }

        .tips-section h3,
        .troubleshooting-section h3 {
            color: var(--success-500);
        }

        [data-theme="dark"] .tips-section h3,
        [data-theme="dark"] .troubleshooting-section h3 {
            color: var(--success-500);
        }

        .contact-section a {
            color: var(--primary-500);
            text-decoration: none;
        }

        .contact-section a:hover {
            text-decoration: underline;
        }

        [data-theme="dark"] .contact-section a {
            color: var(--primary-400);
        }

        /* Toast Messages - Enhanced dark mode */
        .toast {
            position: fixed;
            top: 20px;
            right: 20px;
            padding: 12px 20px;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
            z-index: 1000;
            font-weight: 500;
            opacity: 0;
            transform: translateX(100%);
            transition: all 0.3s ease;
            color: white;
        }

        .toast-success {
            background: linear-gradient(135deg, var(--success-500) 0%, #059669 100%);
        }

        .toast-warning {
            background: linear-gradient(135deg, var(--warning-500) 0%, #d97706 100%);
        }

        .toast-error {
            background: linear-gradient(135deg, var(--error-500) 0%, #dc2626 100%);
        }

        .toast-info {
            background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
        }

        [data-theme="dark"] .toast {
            box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
        }

        /* Dark Mode Adjustments */
        [data-theme="dark"] .instructions-modal,
        [data-theme="dark"] .folding-modal,
        [data-theme="dark"] .terms-modal {
            background: rgba(0, 0, 0, 0.9);
        }

        [data-theme="dark"] .unlock-button:hover {
            box-shadow: 0 8px 25px -5px rgba(96, 165, 250, 0.4);
        }

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

        .fade-in {
            animation: fadeIn 0.3s ease-in-out;
        }

        .slide-up {
            animation: slideUp 0.3s ease-in-out;
        }

        @keyframes slideUp {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* Enhanced Dark Mode Scrollbars */
        [data-theme="dark"] ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }

        [data-theme="dark"] ::-webkit-scrollbar-track {
            background: var(--bg-tertiary);
            border-radius: var(--radius-lg);
        }

        [data-theme="dark"] ::-webkit-scrollbar-thumb {
            background: var(--border-color-strong);
            border-radius: var(--radius-lg);
            border: 2px solid var(--bg-tertiary);
        }

        [data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
            background: var(--text-tertiary);
        }

        [data-theme="dark"] ::-webkit-scrollbar-corner {
            background: var(--bg-tertiary);
        }

        /* Focus States for Dark Mode */
        [data-theme="dark"] *:focus {
            outline-color: var(--primary-400);
        }

        [data-theme="dark"] .form-input:focus,
        [data-theme="dark"] .margin-input:focus {
            border-color: var(--primary-400);
            box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.2);
        }

        /* Selection Colors for Dark Mode */
        [data-theme="dark"] ::selection {
            background: rgba(96, 165, 250, 0.3);
            color: var(--text-primary);
        }

        [data-theme="dark"] ::-moz-selection {
            background: rgba(96, 165, 250, 0.3);
            color: var(--text-primary);
        }

        /* Enhanced Contrast for Accessibility */
        [data-theme="dark"] .nav-item:focus-visible {
            outline: 2px solid var(--primary-400);
            outline-offset: 2px;
        }

        [data-theme="dark"] .btn-primary:focus-visible,
        [data-theme="dark"] .btn-secondary:focus-visible,
        [data-theme="dark"] .control-btn:focus-visible {
            outline: 2px solid var(--primary-400);
            outline-offset: 2px;
        }

        /* Dark Mode Canvas Backgrounds */
        [data-theme="dark"] .canvas-container canvas {
            background: var(--bg-secondary);
        }

        /* Dark Mode Image Borders */
        [data-theme="dark"] .image-preview {
            border-color: var(--border-color-strong);
        }

        [data-theme="dark"] .imported-image {
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
        }

        /* Responsive Design - Enhanced for dark mode */
        @media (max-width: 1200px) {
            .app-container {
                flex-direction: column;
            }
            
            .sidebar {
                width: 100%;
                height: auto;
                flex-direction: row;
                overflow-x: auto;
            }
            
            [data-theme="dark"] .sidebar {
                background: var(--bg-secondary);
                border-bottom: 1px solid var(--border-color-strong);
                border-right: none;
            }
            
            .nav-items {
                display: flex;
                gap: var(--space-2);
                padding: var(--space-4);
                background: var(--primary-800);
            }
            
            [data-theme="dark"] .nav-items {
                background: var(--bg-secondary);
            }
            
            .nav-item {
                flex-shrink: 0;
                margin-bottom: 0;
            }
            
            .edit-layout,
            .touchup-layout,
            .preview-layout,
            .instructions-layout {
                grid-template-columns: 1fr;
                gap: var(--space-6);
            }
            
            .import-container {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            .page {
                padding: var(--space-4);
            }
            
            .page-header h1 {
                font-size: var(--font-size-2xl);
            }
            
            .sidebar {
                padding: var(--space-2);
            }
            
            .sidebar-header {
                padding: var(--space-4);
            }
            
            .logo {
                font-size: var(--font-size-lg);
            }
            
            .nav-item {
                padding: var(--space-3);
            }
            
            .nav-item span {
                display: none;
            }
            
            .control-section {
                padding: var(--space-4);
            }
            
            .threshold-grid {
                grid-template-columns: 1fr;
            }
            
            .margin-grid {
                grid-template-columns: 60px 60px 60px;
                grid-template-rows: 60px 60px 60px;
            }
            
            .instruction-row {
                grid-template-columns: 1fr;
                text-align: center;
                gap: var(--space-3);
            }
            
            .pattern-headers {
                grid-template-columns: 1fr;
            }
            
            .instructions-modal-content,
            
            /* Mobile dark mode adjustments */
            [data-theme="dark"] .dark-mode-toggle {
                top: var(--space-2);
                right: var(--space-2);
            }
            
            [data-theme="dark"] .dark-mode-btn {
                width: 40px;
                height: 40px;
                font-size: var(--font-size-base);
            }
        }

        /* High contrast mode support */
        @media (prefers-contrast: high) {
            [data-theme="dark"] {
                --text-primary: #ffffff;
                --text-secondary: #e2e8f0;
                --border-color: #64748b;
                --border-color-strong: #94a3b8;
            }
        }

        /* Reduced motion support */
        @media (prefers-reduced-motion: reduce) {
            * {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
            }
        }

        .page-navigation {
            display: flex;
            align-items: center;
            gap: var(--space-3);
            margin-left: var(--space-6);
            padding-left: var(--space-6);
            border-left: 2px solid var(--border-color);
            transition: border-color var(--transition-normal);
        }

        [data-theme="dark"] .page-navigation {
            border-left-color: var(--border-color-strong);
        }

        .page-navigation label {
            font-size: var(--font-size-sm);
            font-weight: 500;
            color: var(--text-secondary);
            transition: color var(--transition-normal);
        }

        .page-jump-input {
            width: 80px;
            padding: var(--space-2) var(--space-3);
            border: 2px solid var(--border-color);
            border-radius: var(--radius-md);
            font-size: var(--font-size-sm);
            font-weight: 500;
            text-align: center;
            background: var(--input-bg);
            color: var(--text-primary);
            transition: all var(--transition-fast);
        }

        .page-jump-input:focus {
            outline: none;
            border-color: var(--primary-500);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
        }

        [data-theme="dark"] .page-jump-input:focus {
            box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.2);
        }

        .page-total {
            font-size: var(--font-size-sm);
            color: var(--text-tertiary);
            font-weight: 500;
            transition: color var(--transition-normal);
        }

        .page-jump-btn {
            padding: var(--space-2) var(--space-4);
            font-size: var(--font-size-sm);
            min-width: auto;
        }

        .page-jump-btn i {
            font-size: var(--font-size-xs);
        }

        @media (max-width: 768px) {
            .page-navigation {
                flex-direction: column;
                gap: var(--space-2);
                margin-left: 0;
                padding-left: 0;
                border-left: none;
                padding-top: var(--space-4);
                border-top: 2px solid var(--border-color);
            }
            
            .page-navigation label {
                display: none;
            }
            
            .page-jump-input {
                width: 50px;
            }
        }

        .header-buttons {
            display: flex;
            gap: var(--space-4);
            flex-wrap: wrap;
            align-items: center;
        }

        .terms-button {
            background: var(--bg-tertiary);
            color: var(--text-secondary);
            border: 2px solid var(--border-color);
            padding: var(--space-3) var(--space-6);
            border-radius: var(--radius-lg);
            font-size: var(--font-size-base);
            font-weight: 600;
            cursor: pointer;
            transition: all var(--transition-fast);
            display: inline-flex;
            align-items: center;
            gap: var(--space-2);
        }

        .terms-button:hover {
            background: var(--bg-secondary);
            border-color: var(--primary-400);
            color: var(--primary-500);
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }

        [data-theme="dark"] .terms-button {
            background: var(--bg-secondary);
            border-color: var(--border-color-strong);
        }

        [data-theme="dark"] .terms-button:hover {
            background: var(--bg-tertiary);
            border-color: var(--primary-400);
            color: var(--primary-400);
            box-shadow: 0 4px 14px 0 rgba(96, 165, 250, 0.2);
        }

        /* Responsive adjustments */
        @media (max-width: 768px) {
            .header-buttons {
                flex-direction: column;
                width: 100%;
                gap: var(--space-3);
            }
            
            .help-button,
            .terms-button {
                width: 100%;
                justify-content: center;
            }
        }