:root {
            color-scheme: dark;
            --panel-bg: rgba(20, 20, 20, 0.94);
            --panel-border: #353535;
            --panel-text: #f4f4f4;
            --panel-subtle: #9a9a9a;
            --panel-accent: #00ffaa;
            --panel-accent-strong: #1a3a2a;
            --panel-input: #111;
            --canvas-bg: #050505;
        }

        html,
        body {
            margin: 0;
            height: 100%;
            overflow: hidden;
            background: var(--canvas-bg);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
            color: var(--panel-text);
        }

        button,
        input,
        select,
        textarea {
            font: inherit;
        }

        #app-shell {
            position: fixed;
            inset: 0;
            display: none; /* Hidden by default */
            grid-template-columns: 320px minmax(0, 1fr) 360px;
            gap: 12px;
            padding: 12px;
            box-sizing: border-box;
        }

        body.app-active #app-shell {
            display: grid;
        }

        body.app-active #home-container {
            display: none;
        }

        .side-panel {
            display: flex;
            flex-direction: column;
            gap: 12px;
            min-height: 0;
            padding: 14px;
            border-radius: 10px;
            border: 1px solid var(--panel-border);
            background: var(--panel-bg);
            box-shadow: 0 8px 18px rgba(0, 0, 0, 0.35);
            overflow-y: auto;
        }

        .side-panel h3 {
            margin: 0;
            padding-bottom: 6px;
            border-bottom: 1px solid #3c3c3c;
            font-size: 13px;
            color: var(--panel-accent);
        }

        #viewport-shell {
            position: relative;
            min-width: 0;
            min-height: 0;
            border-radius: 10px;
            overflow: hidden;
            border: 1px solid #202020;
            background: #0a0a0a;
            box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.02);
        }

        #viewport-canvas {
            width: 100%;
            height: 100%;
        }

        #viewport-canvas canvas {
            display: block;
            width: 100%;
            height: 100%;
        }

        .master-switch {
            display: flex;
            align-items: center;
            gap: 10px;
            background: var(--panel-accent-strong);
            padding: 10px;
            border-radius: 6px;
            border: 1px solid var(--panel-accent);
            font-weight: 600;
            color: var(--panel-accent);
        }

        .slider-group,
        .panel-card {
            padding: 10px;
            border-radius: 6px;
            border: 1px solid #2f2f2f;
            background: rgba(255, 255, 255, 0.03);
        }

        .slider-label,
        .field-label {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 8px;
            font-size: 12px;
            color: var(--panel-subtle);
            margin-bottom: 6px;
        }

        .slider-label span:last-child,
        .field-label span:last-child {
            color: var(--panel-accent);
            font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
            font-weight: 600;
        }

        .slider-group input[type="range"] {
            width: 100%;
            margin: 0;
            height: 4px;
            border-radius: 2px;
            outline: none;
            -webkit-appearance: none;
            background: #434343;
            cursor: pointer;
        }

        .slider-group input[type="range"]::-webkit-slider-thumb {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            border: none;
            -webkit-appearance: none;
            background: var(--panel-accent);
            cursor: pointer;
        }

        .control-item {
            display: flex;
            align-items: center;
            gap: 10px;
            margin: 6px 0;
            font-size: 12px;
            color: var(--panel-text);
        }

        .control-item input[type="checkbox"] {
            margin: 0;
        }

        .segmented {
            display: grid;
            grid-template-columns: repeat(5, minmax(0, 1fr));
            gap: 6px;
        }

        .segmented button,
        .button-row button,
        .primary-button {
            padding: 9px 12px;
            border-radius: 6px;
            border: 1px solid #444;
            background: #171717;
            color: var(--panel-text);
            cursor: pointer;
            transition: background 0.12s, border-color 0.12s, color 0.12s;
        }

        .segmented button.active,
        .button-row button:hover,
        .primary-button:hover {
            border-color: var(--panel-accent);
            color: var(--panel-accent);
        }

        .button-row {
            display: grid;
            grid-template-columns: repeat(2, minmax(0, 1fr));
            gap: 8px;
        }

        .primary-button {
            width: 100%;
            background: var(--panel-accent-strong);
            border-color: var(--panel-accent);
            color: var(--panel-accent);
            font-weight: 600;
        }

        .primary-button:disabled,
        .segmented button:disabled,
        .button-row button:disabled {
            cursor: not-allowed;
            opacity: 0.45;
        }

        #export-preview-frame {
            position: relative;
            border-radius: 8px;
            border: 1px solid #2f2f2f;
            background: #080808;
            overflow: hidden;
            min-height: 180px;
            max-height: 300px;
        }

        #export-preview-mount {
            width: 100%;
            max-height: 300px;
        }

        #export-preview-mount canvas {
            display: block;
            width: 100%;
            max-height: 300px;
            height: auto;
        }

        #export-preview-overlay {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
        }

        .field-grid {
            display: grid;
            grid-template-columns: repeat(2, minmax(0, 1fr));
            gap: 10px;
        }

        .field-block {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .field-block.full-span {
            grid-column: 1 / -1;
        }

        .field-block label {
            font-size: 12px;
            color: var(--panel-subtle);
        }

        .field-block input,
        .field-block select,
        .field-block textarea {
            width: 100%;
            box-sizing: border-box;
            padding: 8px 10px;
            border-radius: 6px;
            border: 1px solid #3b3b3b;
            background: var(--panel-input);
            color: var(--panel-text);
        }

        .field-block textarea {
            resize: vertical;
            min-height: 90px;
        }

        .semantic-label-row {
            display: grid;
            grid-template-columns: 28px 48px minmax(0, 1fr);
            gap: 8px;
            align-items: center;
            margin-top: 8px;
        }

        .semantic-label-toggle {
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .semantic-label-id {
            padding: 7px 8px;
            border-radius: 6px;
            background: #131313;
            border: 1px solid #303030;
            font-size: 12px;
            color: var(--panel-accent);
            text-align: center;
            font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
        }

        .helper-text,
        #export-status {
            font-size: 12px;
            color: var(--panel-subtle);
            line-height: 1.45;
        }

        #export-status[data-state="success"] {
            color: var(--panel-accent);
        }

        #export-status[data-state="error"] {
            color: #ff7777;
        }

        @media (max-width: 1400px) {
            #app-shell {
                grid-template-columns: 300px minmax(0, 1fr) 340px;
            }
        }

        /* Landing Home Page Styles */
        #home-container {
            position: fixed;
            inset: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            background: radial-gradient(circle at center, #111b18 0%, #050807 100%);
            z-index: 9999;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
        }

        .home-card {
            width: 580px;
            padding: 40px;
            border-radius: 16px;
            background: rgba(20, 25, 23, 0.75);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid rgba(0, 255, 170, 0.15);
            box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.05);
            text-align: center;
            display: flex;
            flex-direction: column;
            align-items: center;
            animation: fadeIn 0.6s ease-out;
        }

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

        .home-logo {
            margin-bottom: 20px;
            filter: drop-shadow(0 0 12px rgba(0, 255, 170, 0.4));
            animation: float 4s ease-in-out infinite;
        }

        @keyframes float {
            0%, 100% { transform: translateY(0px); }
            50% { transform: translateY(-8px); }
        }

        .home-title {
            margin: 0 0 10px 0;
            font-size: 24px;
            font-weight: 700;
            letter-spacing: 0.5px;
            background: linear-gradient(135deg, #00ffaa 0%, #00bfff 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .home-subtitle {
            margin: 0 0 30px 0;
            font-size: 14px;
            color: #8c9c96;
            line-height: 1.5;
        }

        .dropzone {
            width: 100%;
            border: 2px dashed rgba(0, 255, 170, 0.25);
            border-radius: 12px;
            padding: 35px 20px;
            box-sizing: border-box;
            background: rgba(0, 0, 0, 0.2);
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            margin-bottom: 24px;
        }

        .dropzone:hover, .dropzone.dragover {
            border-color: #00ffaa;
            background: rgba(0, 255, 170, 0.04);
            box-shadow: 0 0 20px rgba(0, 255, 170, 0.1);
        }

        .dropzone:hover .upload-icon, .dropzone.dragover .upload-icon {
            stroke: #00ffaa;
            transform: translateY(-4px);
            filter: drop-shadow(0 0 6px rgba(0, 255, 170, 0.4));
        }

        .upload-icon {
            transition: all 0.3s ease;
            margin-bottom: 16px;
        }

        .dropzone-text {
            margin: 0 0 8px 0;
            font-size: 14px;
            color: #d1dcd6;
        }

        .browse-link {
            color: #00ffaa;
            font-weight: 600;
            text-decoration: underline;
        }

        .file-tip {
            font-size: 12px;
            color: #65756e;
        }

        .file-details-card {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 16px;
            border-radius: 8px;
            background: rgba(0, 255, 170, 0.03);
            border: 1px solid rgba(0, 255, 170, 0.15);
            width: 100%;
            box-sizing: border-box;
            margin-bottom: 20px;
            text-align: left;
        }

        .file-meta {
            display: flex;
            flex-direction: column;
            gap: 4px;
            min-width: 0;
        }

        .file-name {
            font-size: 14px;
            font-weight: 600;
            color: #e5f5ef;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .file-size {
            font-size: 12px;
            color: #65756e;
        }

        .import-button {
            width: 100%;
            padding: 12px 24px;
            border-radius: 8px;
            background: linear-gradient(135deg, #00ffaa 0%, #00cc88 100%);
            color: #050807;
            font-size: 15px;
            font-weight: 700;
            border: none;
            cursor: pointer;
            transition: all 0.2s ease;
            box-shadow: 0 4px 15px rgba(0, 255, 170, 0.3);
        }

        .import-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0, 255, 170, 0.4);
            filter: brightness(1.1);
        }

        .import-button:active {
            transform: translateY(0);
        }

        .home-status {
            padding: 12px;
            border-radius: 6px;
            font-size: 13px;
            margin-top: 15px;
            width: 100%;
            box-sizing: border-box;
            border: 1px solid rgba(255, 119, 119, 0.2);
            background: rgba(255, 119, 119, 0.05);
            color: #ff7777;
        }

        .home-loading {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 12px;
            margin-top: 20px;
        }

        .spinner {
            width: 28px;
            height: 28px;
            border: 3px solid rgba(0, 255, 170, 0.1);
            border-top-color: #00ffaa;
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        #loading-text {
            font-size: 13px;
            color: #00ffaa;
        }
        
        #import-details {
            width: 100%;
            animation: fadeIn 0.4s ease-out;
        }