:root {
            --primary-color: #2563eb;
            --bg-color: #f8fafc;
            --panel-bg: #ffffff;
            --border-color: #e2e8f0;
            --text-color: #1e293b;
            --text-muted: #64748b;
        }

        body.dark {
            --primary-color: #0f64d2;
            --bg-color: #1e1e1e;
            --panel-bg: #2b2b2b;
            /* Slightly lighter for panels */
            --border-color: #4a4a4a;
            /* Sharper, reliable border */
            --text-color: #d4d4d4;
            /* Off-white for readability */
            --text-muted: #888888;
        }

        /* Dark mode specific scrollbar */
        body.dark ::-webkit-scrollbar {
            width: 10px;
            background: #2b2b2b;
        }

        body.dark ::-webkit-scrollbar-thumb {
            background: #4a4a4a;
            border-radius: 4px;
        }

        body.dark ::-webkit-scrollbar-thumb:hover {
            background: #5a5a5a;
        }

        /* Mobile Warning */
        .mobile-warning {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: white;
            z-index: 9999;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            padding: 20px;
            text-align: center;
        }

        @media (max-width: 768px) {
            .mobile-warning {
                display: flex;
            }
        }

        .mobile-warning h2 {
            margin-bottom: 10px;
            color: var(--primary-color);
        }

        .mobile-warning p {
            color: var(--text-muted);
            line-height: 1.6;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg-color);
            color: var(--text-color);
            height: 100vh;
            display: flex;
            flex-direction: column;
            overflow: hidden;
        }

        /* Layout */
        .app-header {
            height: 60px;
            background: var(--panel-bg);
            border-bottom: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            padding: 0 24px;
            justify-content: space-between;
            z-index: 100;
        }

        .header-links {
            display: flex;
            gap: 20px;
            align-items: center;
            position: relative;
        }

        .info-btn {
            width: 32px;
            height: 32px;
            border-radius: 6px;
            border: none;
            background: var(--panel-bg);
            color: var(--text-color);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.2s;
        }

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

        .info-btn.active {
            background: #f1f5f9;
            color: var(--primary-color);
        }

        .info-tooltip {
            position: absolute;
            top: 45px;
            right: 0;
            width: 280px;
            background: var(--panel-bg);
            border: 1px solid var(--border-color);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
            padding: 16px;
            display: none;
            flex-direction: column;
            gap: 12px;
            z-index: 1000;
        }

        .header-dropdown {
            position: absolute;
            top: 45px;
            right: 0;
            width: 300px;
            background: var(--panel-bg);
            border: 1px solid var(--border-color);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
            padding: 20px;
            display: none;
            flex-direction: column;
            z-index: 1000;
        }

        .header-dropdown.show {
            display: flex;
        }

        .header-dropdown h3 {
            margin-bottom: 16px;
            font-size: 15px;
            color: var(--text-color);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .info-tooltip.show {
            display: flex;
        }

        .info-section {
            font-size: 12px;
            line-height: 1.6;
        }

        .info-title {
            font-weight: 600;
            color: var(--text-color);
            margin-bottom: 4px;
            display: block;
        }

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

        .info-link:hover {
            text-decoration: underline;
        }

        .header-link {
            font-size: 13px;
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 500;
            transition: opacity 0.2s;
        }

        .header-link:hover {
            text-decoration: underline;
            opacity: 0.8;
        }

        .app-main {
            flex: 1;
            display: flex;
            overflow: hidden;
        }

        .sidebar {
            width: 320px;
            background: var(--panel-bg);
            border-right: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
            overflow-y: auto;
            padding: 20px;
        }

        .layers-sidebar {
            width: 0;
            background: var(--panel-bg);
            border-left: none;
            display: flex;
            flex-direction: column;
            overflow: hidden;
            padding: 0;
            position: absolute;
            right: 0;
            top: 60px;
            bottom: 0;
            z-index: 150;
            transform: translateX(100%);
            transition: all 0.3s ease;
            box-shadow: -4px 0 12px rgba(0, 0, 0, 0.05);
        }

        .layers-sidebar.show {
            width: 280px;
            padding: 20px;
            border-left: 1px solid var(--border-color);
            transform: translateX(0);
            overflow-y: auto;
        }

        .layer-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 8px 12px;
            background: var(--panel-bg);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            margin-bottom: 8px;
            cursor: grab;
            transition: all 0.2s;
            position: relative;
        }

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

        .layer-item.dragging {
            opacity: 0.5;
            border: 1px dashed var(--primary-color);
            background: #f1f5f9;
        }

        .layer-item.drag-over-top::before {
            content: "";
            position: absolute;
            top: -6px;
            left: 0;
            right: 0;
            height: 4px;
            background: var(--primary-color);
            border-radius: 2px;
            z-index: 10;
        }

        .layer-item.drag-over-bottom::after {
            content: "";
            position: absolute;
            bottom: -6px;
            left: 0;
            right: 0;
            height: 4px;
            background: var(--primary-color);
            border-radius: 2px;
            z-index: 10;
        }

        .layer-item:hover {
            border-color: var(--primary-color);
            background: #f8fafc;
        }

        .layer-item.selected {
            border-color: var(--primary-color);
            background: #eff6ff;
            box-shadow: 0 0 0 1px var(--primary-color);
        }

        .layer-thumb {
            width: 40px;
            height: 40px;
            border-radius: 4px;
            background: #f1f5f9;
            border: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            flex-shrink: 0;
        }

        .layer-thumb img {
            max-width: 100%;
            max-height: 100%;
            object-fit: contain;
        }

        .layer-thumb canvas {
            max-width: 100%;
            max-height: 100%;
        }

        .layer-info {
            flex: 1;
            min-width: 0;
        }

        .layer-name {
            font-size: 13px;
            font-weight: 500;
            color: var(--text-color);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            display: block;
        }

        .layer-type {
            font-size: 11px;
            color: var(--text-muted);
            display: block;
        }

        .layer-actions {
            display: flex;
            gap: 4px;
        }

        .layer-btn {
            padding: 6px;
            border-radius: 4px;
            border: none;
            background: transparent;
            cursor: pointer;
            color: var(--text-muted);
            font-size: 14px;
            transition: all 0.1s;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .layer-btn:hover {
            background: #fee2e2;
            color: #ef4444;
        }

        .layer-toggle-btn {
            width: 32px;
            height: 32px;
            border-radius: 6px;
            border: none;
            background: var(--panel-bg);
            color: var(--text-color);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.2s;
            position: relative;
        }

        .layer-toggle-btn:hover {
            background: var(--bg-color);
        }

        .layer-toggle-btn.active {
            background: #f1f5f9;
            color: var(--primary-color);
        }

        .layer-toggle-btn .badge {
            position: absolute;
            top: -5px;
            right: -5px;
            background: var(--primary-color);
            color: white;
            font-size: 10px;
            min-width: 16px;
            height: 16px;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            border: 2px solid white;
        }

        .preview-area {
            flex: 1;
            background: #a0a0a0;
            /* Neutral gray for canvas bg */
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            overflow: hidden;
            /* Checkerboard pattern */
            background-image:
                linear-gradient(45deg, #b0b0b0 25%, transparent 25%),
                linear-gradient(-45deg, #b0b0b0 25%, transparent 25%),
                linear-gradient(45deg, transparent 75%, #b0b0b0 75%),
                linear-gradient(-45deg, transparent 75%, #b0b0b0 75%);
            background-size: 20px 20px;
            background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
        }

        body.dark .preview-area {
            background: #1e1e1e;
            /* Darker grey */
            background-image:
                linear-gradient(45deg, #2a2a2a 25%, transparent 25%),
                linear-gradient(-45deg, #2a2a2a 25%, transparent 25%),
                linear-gradient(45deg, transparent 75%, #2a2a2a 75%),
                linear-gradient(-45deg, transparent 75%, #2a2a2a 75%);
            background-size: 20px 20px;
            background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
        }

        .scroll-container {
            width: 100%;
            height: 100%;
            overflow: auto;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 40px;
        }

        .paper-size-tag {
            display: flex;
            align-items: center;
            background: #f1f5f9;
            border-radius: 4px;
            overflow: hidden;
            border: 1px solid var(--border-color);
        }

        body.dark .paper-size-tag {
            background: rgba(255, 255, 255, 0.1);
            /* User requested 10% opacity style */
            border-color: #4a4a4a;
        }

        /* Components */
        .section {
            margin-bottom: 20px;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--border-color);
        }

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

        .section-title {
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 12px;
            color: var(--text-color);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .control-group {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

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

        .input-field {
            flex: 1;
        }

        label {
            display: block;
            font-size: 12px;
            color: var(--text-muted);
            margin-bottom: 4px;
        }

        input[type="number"],
        input[type="text"],
        select,
        textarea {
            width: 100%;
            padding: 6px 10px;
            /* More compact */
            border: 1px solid var(--border-color);
            border-radius: 4px;
            /* Sharper */
            font-size: 13px;
            /* Smaller font */
            outline: none;
            transition: border-color 0.2s;
            background: var(--panel-bg);
            color: var(--text-color);
        }

        body.dark input[type="number"],
        body.dark input[type="text"],
        body.dark select,
        body.dark textarea {
            background: #1e1e1e;
            /* Darker input background */
            border-color: #383838;
            color: #d4d4d4;
        }

        body.dark input:focus,
        body.dark select:focus {
            background: #2b2b2b;
            border-color: var(--primary-color);
        }

        input:focus,
        select:focus {
            border-color: var(--primary-color);
        }

        .btn {
            padding: 6px 14px;
            /* More compact */
            border-radius: 4px;
            /* Sharper */
            font-size: 13px;
            font-weight: 500;
            cursor: pointer;
            border: 1px solid var(--border-color);
            background: var(--panel-bg);
            color: var(--text-color);
            transition: all 0.1s;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
        }

        body.dark .btn {
            background: #383838;
            border-color: #2b2b2b;
            color: #d4d4d4;
        }

        body.dark .btn:hover {
            background: #4a4a4a;
        }

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

        .btn-primary:hover {
            filter: brightness(1.1);
            /* Use filter for generic lighten */
        }

        body.dark .btn-primary:hover {
            filter: brightness(1.2);
        }

        .btn-danger {
            color: #ef4444;
        }

        .btn-danger:hover {
            background: #fef2f2;
        }

        body.dark .btn-danger:hover {
            background: #450a0a;
            /* Dark red background */
        }

        .btn-full {
            width: 100%;
        }

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

        /* Paper Preview */
        .paper-container {
            background: white;
            box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
            position: relative;
            transform-origin: center center;
        }

        #previewCanvas {
            display: block;
            width: 100%;
            height: 100%;
        }

        .image-overlay,
        .text-overlay {
            position: absolute;
            border: 1px dashed transparent;
            cursor: move;
            user-select: none;
            box-sizing: content-box;
        }

        .image-overlay:hover,
        .text-overlay:hover {
            border-color: #cbd5e1;
        }

        .image-overlay.selected,
        .text-overlay.selected {
            border-color: var(--primary-color);
        }

        .image-overlay canvas {
            width: 100%;
            height: 100%;
            display: block;
        }

        .text-content {
            white-space: pre-wrap;
            line-height: 1.2;
            padding: 2px;
            word-break: break-all;
        }

        .delete-handle {
            position: absolute;
            top: -10px;
            left: -10px;
            width: 20px;
            height: 20px;
            background: #ef4444;
            color: white;
            border-radius: 50%;
            display: none;
            align-items: center;
            justify-content: center;
            font-size: 12px;
            cursor: pointer;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
        }

        .selected .delete-handle {
            display: flex;
        }

        .resize-handle {
            position: absolute;
            width: 12px;
            height: 12px;
            background: white;
            border: 2px solid var(--primary-color);
            bottom: -6px;
            right: -6px;
            cursor: nwse-resize;
            border-radius: 50%;
        }

        /* Drop Area */
        .drop-zone {
            border: 2px dashed var(--border-color);
            border-radius: 8px;
            padding: 20px;
            text-align: center;
            cursor: pointer;
            transition: all 0.2s;
        }

        .drop-zone:hover,
        .drop-zone.drag-over {
            border-color: var(--primary-color);
            background: #eff6ff;
        }

        body.dark .drop-zone:hover,
        body.dark .drop-zone.drag-over {
            background: #1e293b;
        }

        @media (prefers-color-scheme: dark) {

            body:not(.light) .drop-zone:hover,
            body:not(.light) .drop-zone.drag-over {
                background: #1e293b;
                border-color: var(--primary-color);
            }
        }

        .drop-zone-text {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* Status Toast */
        .status-bar {
            position: fixed;
            bottom: 20px;
            right: 20px;
            padding: 12px 24px;
            border-radius: 8px;
            background: #1e293b;
            color: white;
            font-size: 14px;
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
            transform: translateY(100px);
            transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
            z-index: 1000;
        }

        .status-bar.show {
            transform: translateY(0);
        }

        /* Clear Button */
        .clear-btn {
            position: absolute;
            top: 4px;
            right: 4px;
            background: #ef4444;
            color: white;
            border: none;
            padding: 0px 5px;
            border-radius: 2px;
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
            z-index: 100;
            transition: all 0.2s;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .clear-btn:hover {
            background: #dc2626;
            transform: translateY(-1px);
            box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
        }

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

        /* Zoom Control */
        .zoom-control {
            position: absolute;
            bottom: 24px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--panel-bg);
            backdrop-filter: blur(4px);
            padding: 10px 16px;
            border-radius: 30px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            display: flex;
            align-items: center;
            gap: 12px;
            z-index: 100;
            border: 1px solid var(--border-color);
        }

        .zoom-control input[type="range"] {
            width: 120px;
        }

        .zoom-btn {
            background: transparent;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            font-size: 16px;
            color: var(--text-color);
            transition: all 0.2s;
            padding: 0;
        }

        .zoom-btn:hover {
            background: var(--bg-color);
            border-color: var(--primary-color);
            color: var(--primary-color);
        }

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

        .zoom-value {
            font-size: 12px;
            font-weight: 600;
            color: var(--text-color);
            min-width: 50px;
            text-align: center;
        }

        .reality-scale-container {
            position: relative;
            display: inline-flex;
            align-items: center;
        }

        .reality-scale-tooltip {
            position: absolute;
            bottom: 100%;
            left: 50%;
            transform: translateX(-50%);
            margin-bottom: 8px;
            padding: 16px 20px;
            background: #1e293b;
            color: white;
            font-size: 14px;
            line-height: 1.7;
            border-radius: 8px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s;
            z-index: 1000;
            width: 500px;
            max-width: calc(100vw - 40px);
            white-space: normal;
            word-wrap: break-word;
        }

        .reality-scale-tooltip::after {
            content: '';
            position: absolute;
            top: 100%;
            left: 50%;
            transform: translateX(-50%);
            border: 6px solid transparent;
            border-top-color: #1e293b;
        }

        .reality-scale-container:hover .reality-scale-tooltip {
            opacity: 1;
        }

        /* Crop Overlay */
        #cropModal {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.85);
            display: none;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            z-index: 2000;
            padding: 40px;
        }

        .crop-container {
            position: relative;
            max-width: 100%;
            max-height: calc(100% - 100px);
            background: #000;
        }

        #cropCanvas {
            display: block;
            max-width: 100%;
            max-height: 100%;
        }

        .crop-controls {
            margin-top: 20px;
            display: flex;
            gap: 12px;
        }

        /* Text Edit Modal */
        .modal-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.7);
            display: none;
            align-items: center;
            justify-content: center;
            z-index: 3000;
            backdrop-filter: blur(4px);
        }

        .modal-content {
            background: var(--panel-bg);
            padding: 24px;
            border-radius: 12px;
            width: 90%;
            max-width: 500px;
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.2);
        }

        .modal-content h3 {
            margin-bottom: 16px;
        }

        .modal-actions {
            display: flex;
            justify-content: flex-end;
            gap: 12px;
            margin-top: 20px;
        }

        /* Better Sliders */
        input[type="range"] {
            width: 100%;
            accent-color: var(--primary-color);
        }

        .slider-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 4px;
        }

        .slider-value {
            font-size: 12px;
            font-weight: 600;
            color: var(--primary-color);
        }

        /* Template Gallery Modal */
        .template-gallery-modal {
            max-width: 900px;
            width: 95%;
            max-height: 85vh;
            overflow-y: auto;
        }

        .template-gallery-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 16px;
            margin-top: 16px;
        }

        .template-item {
            background: var(--bg-color);
            border: 2px solid var(--border-color);
            border-radius: 8px;
            padding: 12px;
            cursor: pointer;
            transition: all 0.2s;
            position: relative;
        }

        .template-item:hover {
            border-color: var(--primary-color);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
        }

        .template-item.selected {
            border-color: var(--primary-color);
            background: rgba(var(--primary-rgb), 0.1);
        }

        .template-thumbnail {
            width: 100%;
            height: 150px;
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 4px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 8px;
            overflow: hidden;
        }

        .template-thumbnail img {
            max-width: 100%;
            max-height: 100%;
            object-fit: contain;
        }

        .template-thumbnail canvas {
            max-width: 100%;
            max-height: 100%;
        }

        .template-name {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-color);
            margin-bottom: 4px;
            text-align: center;
            word-break: break-word;
        }

        .template-info {
            font-size: 11px;
            color: var(--text-muted);
            text-align: center;
        }

        .template-actions {
            display: flex;
            gap: 8px;
            margin-top: 8px;
        }

        .template-actions button {
            flex: 1;
            padding: 6px;
            font-size: 12px;
        }

        .template-empty {
            text-align: center;
            padding: 40px;
            color: var(--text-muted);
        }

        .template-empty-icon {
            font-size: 48px;
            margin-bottom: 12px;
        }