:root {
            --bg-primary: #070a13;
            --bg-secondary: #101524;
            --bg-tertiary: #1a2238;
            --accent-cyan: #00f2ff;
            --accent-purple: #903df5;
            --accent-green: #10b981;
            --accent-red: #ef4444;
            --accent-orange: #f59e0b;
            --accent-pink: #ec4899;
            --text-primary: #f3f4f6;
            --text-secondary: #9ca3af;
            --border: #232d45;
            --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);

            --accent-1: #00f2ff;
            --accent-2: #903df5;
            --accent-3: #ff9f00;
            --accent-4: #f43f5e;
            --accent-5: #10b981;
            --accent-6: #a855f7;

            --series-1: #3987e5;
            --series-2: #d95926;
            --series-3: #199e70;
            --series-4: #c98500;
            --series-5: #d55181;
            --series-6: #008300;
            --series-7: #9085e9;
            --series-8: #e66767;
            --sequential-1: #cde2fb;
            --sequential-2: #9ec5f4;
            --sequential-3: #6da7ec;
            --sequential-4: #3987e5;
            --sequential-5: #256abf;
            --sequential-6: #184f95;
            --sequential-7: #0d366b;
        }

        :root.light-theme,
        body.light-theme {
            --bg-primary: #f8fafc;
            --bg-secondary: #ffffff;
            --bg-tertiary: #f1f5f9;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --border: #cbd5e1;
            --card-shadow: 0 10px 30px rgba(15, 23, 42, 0.12), 0 1px 3px rgba(15, 23, 42, 0.05);

            --accent-cyan: #026469;
            --accent-purple: #7c3aed;
            --accent-green: #059669;
            --accent-red: #dc2626;
            --accent-orange: #ea580c;
            --accent-pink: #db2777;

            --accent-1: #026469;
            --accent-2: #7c3aed;
            --accent-3: #ea580c;
            --accent-4: #be123c;
            --accent-5: #059669;
            --accent-6: #8b5cf6;

            --series-1: #2a78d6;
            --series-2: #eb6834;
            --series-3: #1baf7a;
            --series-4: #eda100;
            --series-5: #e87ba4;
            --series-6: #008300;
            --series-7: #4a3aa7;
            --series-8: #e34948;
        }

        /* Specific overrides to make the lower bar highly visible and readable in light mode */
        body.light-theme .graph-controls {
            border-color: #94a3b8;
            background-color: #ffffff;
            box-shadow: 0 10px 30px rgba(15, 23, 42, 0.15);
        }
        body.light-theme .graph-controls,
        body.light-theme .graph-controls label,
        body.light-theme .graph-controls span {
            color: #0f172a !important;
        }
        body.light-theme .control-btn {
            background-color: #f8fafc;
            border-color: #cbd5e1;
            color: #0f172a;
        }
        body.light-theme .control-btn:hover {
            border-color: var(--accent-cyan);
            background-color: #f1f5f9;
            color: var(--accent-cyan);
        }
        body.light-theme #layout-select {
            background-color: #f8fafc;
            border-color: #cbd5e1;
            color: #0f172a !important;
        }
        body.light-theme #layout-select option {
            background-color: #ffffff !important;
            color: #0f172a !important;
        }

        .theme-toggle-btn, .docs-btn {
            background-color: var(--bg-tertiary);
            border: 1px solid var(--border);
            color: var(--text-primary) !important;
            padding: 0.35rem 0.85rem;
            border-radius: 6px;
            cursor: pointer;
            font-family: inherit;
            font-size: 0.8rem;
            font-weight: 600;
            transition: all 0.2s;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            height: 28px;
            box-sizing: border-box;
        }
        .docs-btn:visited {
            color: var(--text-primary) !important;
        }
        .theme-toggle-btn:hover, .docs-btn:hover, .docs-btn:hover:visited {
            border-color: var(--accent-cyan) !important;
            color: var(--accent-cyan) !important;
            box-shadow: 0 0 8px rgba(0, 242, 255, 0.15);
        }

        .depict-privacy-note {
            color: var(--text-secondary);
            font-size: 0.68rem;
            line-height: 1.35;
            margin: -0.1rem 0 0.45rem;
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        * {
            scrollbar-color: color-mix(in srgb, var(--text-secondary) 55%, transparent) var(--bg-secondary);
        }
        *::-webkit-scrollbar {
            width: 10px;
            height: 10px;
        }
        *::-webkit-scrollbar-track {
            background: var(--bg-secondary);
        }
        *::-webkit-scrollbar-thumb {
            background: color-mix(in srgb, var(--text-secondary) 55%, transparent);
            border-radius: 999px;
            border: 2px solid var(--bg-secondary);
        }
        body {
            font-family: 'Outfit', sans-serif;
            background-color: var(--bg-primary);
            color: var(--text-primary);
            height: 100vh;
            display: flex;
            flex-direction: column;
            overflow: hidden;
        }

        /* Top Header */
        .app-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            min-height: 3.1rem;
            padding: 0.65rem 1.25rem;
            background: rgba(16, 21, 36, 0.96);
            border-bottom: 1px solid var(--border);
            box-shadow: 0 4px 20px rgba(0,0,0,0.18);
            z-index: 100;
            position: relative;
            flex-shrink: 0;
        }
        body.light-theme .app-header {
            background: rgba(255,255,255,0.96);
            box-shadow: 0 4px 18px rgba(15, 23, 42, 0.08);
        }
        .brand-home {
            display: inline-flex;
            align-items: center;
            min-width: 0;
            gap: 0.6rem;
            padding: 0;
            border: 0;
            background: transparent;
            color: inherit;
            cursor: pointer;
            font-family: inherit;
            text-align: left;
        }
        .brand-home:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 4px;
            border-radius: 8px;
        }
        .brand-home h1 {
            margin: 0;
            font-size: 1.15rem;
            font-weight: 700;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            font-family: 'Outfit', sans-serif;
            white-space: nowrap;
            letter-spacing: 0;
        }
        .brand-mark {
            width: 2rem;
            height: 2rem;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border: 1px solid rgba(0, 242, 255, 0.28);
            border-radius: 8px;
            background: rgba(0, 242, 255, 0.06);
            box-shadow: inset 0 0 18px rgba(144, 61, 245, 0.12);
            flex: 0 0 auto;
        }
        .brand-mark svg {
            width: 1.65rem;
            height: 1.65rem;
            display: block;
        }
        .brand-ring,
        .brand-bond,
        .brand-arrow,
        .brand-arrowhead {
            fill: none;
            stroke-linecap: round;
            stroke-linejoin: round;
        }
        .brand-ring {
            stroke: var(--accent-cyan);
            stroke-width: 2;
            opacity: 0.75;
        }
        .brand-bond {
            stroke: var(--text-secondary);
            stroke-width: 1.5;
            opacity: 0.85;
        }
        .brand-arrow,
        .brand-arrowhead {
            stroke: var(--accent-pink);
            stroke-width: 2.5;
        }
        .header-actions {
            display: flex;
            align-items: center;
            justify-content: flex-end;
            gap: 0.75rem;
            min-width: 0;
            flex-shrink: 0;
        }
        .db-status-badge,
        header .db-badge {
            font-size: 0.75rem;
            background-color: rgba(0, 242, 255, 0.1);
            color: var(--accent-cyan);
            border: 1px solid var(--accent-cyan);
            padding: 0.25rem 0.75rem;
            border-radius: 9999px;
            font-weight: 600;
            text-transform: uppercase;
            white-space: nowrap;
        }
        .submit-btn {
            border: 0;
            border-radius: 6px;
            padding: 0.38rem 0.78rem;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
            color: #ffffff;
            cursor: pointer;
            font-family: inherit;
            font-size: 0.78rem;
            font-weight: 700;
            line-height: 1;
            white-space: nowrap;
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: 0 2px 8px rgba(0, 242, 255, 0.1);
        }
        .submit-btn:hover {
            opacity: 0.95;
            transform: translateY(-1px);
            box-shadow: 0 4px 14px rgba(0, 242, 255, 0.35);
        }
        .submit-btn:active {
            transform: translateY(0);
        }

        /* Main Workspace Layout */
        .workspace {
            flex: 1;
            display: flex;
            overflow: hidden;
            position: relative;
        }

        /* Left Side Panel (Search & Taxonomy) */
        .left-panel {
            width: 380px;
            background-color: var(--bg-secondary);
            border-right: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            overflow: hidden;
            transition: all 0.3s ease;
        }
        .panel-tabs {
            display: flex;
            border-bottom: 1px solid var(--border);
        }
        .tab-btn {
            flex: 1;
            padding: 0.85rem;
            background: none;
            border: none;
            color: var(--text-secondary);
            font-family: 'Outfit', sans-serif;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s;
            text-align: center;
            white-space: nowrap;
        }
        .tab-btn:hover {
            color: var(--text-primary);
        }
        .tab-btn.active {
            color: var(--accent-cyan);
            border-bottom: 2px solid var(--accent-cyan);
            background-color: rgba(128, 128, 128, 0.02);
        }
        .tab-content-container {
            flex: 1;
            overflow-y: auto;
            padding: 1.5rem;
        }
        .tab-pane {
            display: none;
        }
        .tab-pane.active {
            display: block;
        }

        /* Search Tab */
        .search-box {
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
            margin-bottom: 1.5rem;
        }
        .search-input {
            width: 100%;
            padding: 0.75rem 1rem;
            border-radius: 8px;
            border: 1px solid var(--border);
            background-color: var(--bg-tertiary);
            color: var(--text-primary);
            font-family: inherit;
            font-size: 0.95rem;
            outline: none;
            transition: border-color 0.2s;
        }
        .search-input:focus {
            border-color: var(--accent-cyan);
        }
        .search-btn {
            padding: 0.75rem;
            border-radius: 8px;
            border: none;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
            color: #fff;
            font-family: inherit;
            font-weight: 600;
            cursor: pointer;
            transition: opacity 0.2s;
        }
        .search-btn:hover {
            opacity: 0.9;
        }
        .search-results {
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }
        .result-card {
            background-color: var(--bg-tertiary);
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 1rem;
            cursor: pointer;
            transition: all 0.2s;
        }
        .result-card:hover {
            border-color: var(--accent-cyan);
            transform: translateY(-2px);
        }
        .result-card h4 {
            font-size: 0.95rem;
            color: var(--text-primary);
            margin-bottom: 0.25rem;
        }
        .result-card p {
            font-size: 0.8rem;
            color: var(--text-secondary);
            font-family: 'JetBrains Mono', monospace;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        /* Taxonomy Tree Tab */
        .tree-node {
            margin-left: 0.5rem;
            user-select: none;
        }
        .tree-header {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.4rem 0.5rem;
            border-radius: 4px;
            cursor: pointer;
            transition: background-color 0.2s;
        }
        .tree-header:hover {
            background-color: var(--bg-tertiary);
        }
        .taxonomy-node-label {
            display: flex;
            flex: 1;
            min-width: 0;
            flex-direction: column;
            gap: 0.25rem;
        }
        .taxonomy-node-title {
            overflow: hidden;
            font-weight: 500;
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        .taxonomy-ontology-release {
            display: flex;
            flex-wrap: wrap;
            gap: 0.35rem 0.65rem;
            align-items: center;
            margin: -0.25rem 0 0.75rem;
            color: var(--text-secondary);
            font-size: 0.7rem;
        }
        .taxonomy-ontology-release[hidden] { display: none; }
        .taxonomy-ontology-release a,
        .ontology-release-link {
            color: var(--accent-cyan);
            text-decoration: none;
        }
        .taxonomy-ontology-release a:hover,
        .ontology-release-link:hover {
            text-decoration: underline;
        }
        .ontology-xrefs {
            display: flex;
            flex-wrap: wrap;
            gap: 0.3rem;
        }
        .ontology-xref {
            width: fit-content;
            border: 1px solid color-mix(in srgb, var(--accent-purple) 60%, var(--border));
            border-radius: 999px;
            padding: 0.12rem 0.42rem;
            background: color-mix(in srgb, var(--accent-purple) 10%, transparent);
            color: var(--accent-purple);
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.66rem;
            line-height: 1.35;
            text-decoration: none;
        }
        .ontology-xref:hover {
            border-color: var(--accent-purple);
            text-decoration: none;
        }
        .ontology-xrefs.compact .ontology-xref {
            font-size: 0.6rem;
        }
        .tree-toggle {
            display: inline-block;
            width: 1rem;
            text-align: center;
            color: var(--text-secondary);
            font-size: 0.75rem;
            transition: transform 0.2s;
        }
        .tree-toggle.expanded {
            transform: rotate(90deg);
        }
        .tree-children {
            display: none;
            border-left: 1px dashed var(--border);
            margin-left: 0.5rem;
            padding-left: 0.5rem;
        }
        .tree-children.show {
            display: block;
        }
        .tree-reactions {
            list-style: none;
            margin-left: 1rem;
        }
        .tree-rxn-item {
            padding: 0.3rem 0.5rem;
            border-radius: 4px;
            font-size: 0.85rem;
            cursor: pointer;
            color: var(--text-secondary);
            font-family: 'JetBrains Mono', monospace;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .tree-rxn-item:hover {
            color: var(--accent-cyan);
            background-color: var(--bg-tertiary);
        }

        /* Center Panel (Force Directed Graph Visualizer) */
        .center-panel {
            flex: 1;
            display: flex;
            flex-direction: column;
            background-color: var(--bg-primary);
            position: relative;
            overflow: hidden;
        }
        .graph-viewport {
            flex: 1;
            position: relative;
            cursor: grab;
            overflow: auto;
        }
        .graph-viewport:active {
            cursor: grabbing;
        }
        .taxonomy-overview-viewport {
            display: none;
            position: absolute;
            inset: 0;
            z-index: 10;
            flex-direction: column;
            min-width: 0;
            background: var(--bg-primary);
        }
        .taxonomy-overview-badge {
            padding: 0.1rem 0.5rem;
            border: 1px solid var(--accent-green);
            border-radius: 999px;
            background: color-mix(in srgb, var(--accent-green) 12%, transparent);
            color: var(--accent-green);
            font-size: 0.68rem;
            font-weight: 600;
            letter-spacing: 0.02em;
        }
        .taxonomy-toolbar-link {
            display: inline-block;
            text-decoration: none;
        }
        .taxonomy-toolbar-link-first {
            margin-left: auto;
        }
        .kg-mini-btn.active {
            background-color: var(--accent-cyan) !important;
            color: #08131a !important;
            border-color: var(--accent-cyan) !important;
            font-weight: 600;
        }
        .taxonomy-overview-canvas {
            flex: 1;
            overflow: auto;
            padding: 1rem;
            background: var(--bg-primary);
        }
        .taxonomy-overview-canvas img {
            display: block;
            width: max(100%, 1180px);
            max-width: 2360px;
            height: auto;
            margin: 0 auto;
            border: 1px solid var(--border);
            border-radius: 10px;
            box-shadow: var(--card-shadow);
        }
        .graph-controls {
            position: absolute;
            bottom: 2rem;
            left: 50%;
            transform: translateX(-50%);
            background-color: rgba(16, 21, 36, 0.85);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 0.75rem 1.5rem;
            display: flex;
            align-items: center;
            gap: 0.85rem;
            box-shadow: var(--card-shadow);
            z-index: 10;
            max-width: calc(100% - 2rem);
            white-space: nowrap;
        }
        .show-all-toggle,
        .show-all-text {
            white-space: nowrap;
            flex-wrap: nowrap;
            flex-shrink: 0;
        }
        .show-all-text {
            display: inline-flex;
            align-items: center;
            gap: 0.25rem;
        }
        .control-btn {
            background-color: var(--bg-tertiary);
            border: 1px solid var(--border);
            color: var(--text-primary);
            width: 2.2rem;
            height: 2.2rem;
            border-radius: 50%;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
            transition: all 0.2s;
        }
        .control-btn:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            background-color: var(--bg-secondary);
        }
        .control-btn:disabled {
            opacity: 0.3;
            cursor: not-allowed;
        }
        .step-indicator {
            font-size: 0.9rem;
            font-weight: 600;
            min-width: 80px;
            text-align: center;
        }

        /* Right Panel (Mechanism & Details) */
        .right-panel {
            width: 400px;
            background-color: var(--bg-secondary);
            border-left: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            overflow-y: auto;
            padding: 1.5rem;
        }
        .rxn-header {
            border-bottom: 1px solid var(--border);
            padding-bottom: 1rem;
            margin-bottom: 1.5rem;
        }
        .rxn-header h2 {
            font-size: 1.4rem;
            color: var(--text-primary);
            margin-bottom: 0.25rem;
        }
        .rxn-header .taxonomy-path {
            font-size: 0.8rem;
            color: var(--text-secondary);
            display: block;
            margin-bottom: 0.5rem;
        }
        .smiles-box {
            background-color: var(--bg-tertiary);
            border: 1px solid var(--border);
            border-radius: 6px;
            padding: 0.75rem;
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.8rem;
            margin-bottom: 1.5rem;
            word-break: break-all;
        }
        .smiles-label {
            font-size: 0.7rem;
            text-transform: uppercase;
            color: var(--accent-cyan);
            display: block;
            margin-bottom: 0.25rem;
            font-weight: bold;
        }

        .section-title {
            font-size: 1rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            color: var(--text-secondary);
            margin-bottom: 1rem;
            border-bottom: 1px solid var(--border);
            padding-bottom: 0.25rem;
        }

        /* EPD Step List */
        .step-list {
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }
        .step-item {
            background-color: var(--bg-tertiary);
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 1rem;
            cursor: pointer;
            transition: all 0.2s;
            border-left: 4px solid var(--border);
        }
        .step-item:hover {
            border-color: var(--accent-cyan);
        }
        .step-item.active {
            border-left-color: var(--accent-cyan);
            background-color: rgba(0, 242, 255, 0.02);
            box-shadow: inset 0 0 10px rgba(0, 242, 255, 0.05);
        }
        .step-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 0.5rem;
        }
        .step-number {
            font-size: 0.8rem;
            font-weight: 700;
            color: var(--accent-cyan);
            text-transform: uppercase;
        }
        .step-badge {
            font-size: 0.7rem;
            background-color: var(--bg-primary);
            border: 1px solid var(--border);
            color: var(--text-primary);
            padding: 0.15rem 0.4rem;
            border-radius: 4px;
            font-family: 'JetBrains Mono', monospace;
        }
        .step-desc {
            font-size: 0.85rem;
            color: var(--text-secondary);
        }
        .mechanism-candidate-status {
            margin: 0 0 0.65rem;
            color: var(--accent-orange);
        }
        .mechanism-candidate-label {
            display: flex;
            flex-direction: column;
            gap: 0.35rem;
            color: var(--text-secondary);
            font-size: 0.72rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.03em;
        }
        .mechanism-candidate-select {
            width: 100%;
            min-width: 0;
            padding: 0.45rem 0.5rem;
            border: 1px solid var(--border);
            border-radius: 5px;
            background: var(--bg-primary);
            color: var(--text-primary);
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.72rem;
            text-transform: none;
            letter-spacing: normal;
        }
        .mechanism-candidate-select:focus {
            border-color: var(--accent-cyan);
            outline: 2px solid rgba(0, 242, 255, 0.18);
            outline-offset: 1px;
        }
        /* Copy to Clipboard Buttons */
        .copy-btn {
            background: transparent;
            border: none;
            color: var(--accent-cyan);
            font-size: 0.75rem;
            cursor: pointer;
            padding: 2px 6px;
            border-radius: 4px;
            font-weight: 600;
            transition: background 0.2s, transform 0.1s;
        }
        .copy-btn:hover {
            background: rgba(0, 242, 255, 0.12);
        }
        body.light-theme .copy-btn:hover {
            background: rgba(2, 100, 105, 0.1);
        }
        .copy-btn:active {
            transform: scale(0.95);
        }

        .schema-summary {
            max-width: 390px;
            margin: 2rem auto 0;
            border: 1px solid var(--border);
            border-radius: 8px;
            background: var(--bg-secondary);
            padding: 0.85rem 1rem;
            text-align: left;
        }
        .schema-figure {
            width: 100%;
            margin: 0 0 1.5rem;
            padding: 0;
            border: 0;
            background: transparent;
        }
        .schema-figure-trigger {
            display: block;
            width: 100%;
            padding: 0;
            border: 0;
            background: transparent;
            color: inherit;
            cursor: zoom-in;
        }
        .schema-figure-trigger:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 4px;
            border-radius: 4px;
        }
        .schema-figure img {
            display: block;
            width: 100%;
            height: auto;
            transition: opacity 0.18s ease, transform 0.18s ease;
        }
        .schema-figure-trigger:hover img {
            opacity: 0.92;
            transform: scale(1.01);
        }
        .schema-figure figcaption {
            margin-top: 0.4rem;
            color: var(--text-secondary);
            font-size: 0.68rem;
            text-align: right;
        }
        .schema-summary-title {
            margin: 0 0 0.65rem;
            color: var(--text-primary);
            font-size: 0.8rem;
            font-weight: 600;
        }
        .schema-summary-grid {
            display: grid;
            grid-template-columns: minmax(115px, auto) 1fr;
            gap: 0.38rem 0.6rem;
            font-size: 0.68rem;
            line-height: 1.35;
        }
        .schema-summary-grid > span {
            color: var(--accent-purple);
            font-family: 'JetBrains Mono', monospace;
            font-weight: 600;
        }
        .schema-summary-grid > small {
            color: var(--text-secondary);
            font-size: inherit;
        }

        .relation-fallback {
            padding: 0.75rem;
            color: var(--text-secondary);
            text-align: center;
        }
        .depict-source-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 0.5rem;
            margin-top: 0.35rem;
        }
        .depict-renderer-badge {
            padding: 0.12rem 0.35rem;
            border: 1px solid rgba(0, 242, 255, 0.35);
            border-radius: 999px;
            color: var(--accent-cyan);
            background: rgba(0, 242, 255, 0.08);
            font-size: 0.62rem;
            font-weight: 600;
        }
        .depict-renderer-badge.fallback {
            border-color: rgba(255, 170, 0, 0.4);
            color: var(--accent-orange);
            background: rgba(255, 170, 0, 0.08);
        }
        .depict-source-link {
            color: var(--text-secondary);
            font-size: 0.72rem;
            text-align: right;
        }

        /* Download JSON Button */
        .download-btn {
            background: linear-gradient(135deg, var(--accent-1), var(--accent-cyan));
            color: #0d0e15;
            border: none;
            padding: 6px 12px;
            font-size: 0.8rem;
            font-weight: 600;
            border-radius: 6px;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 6px;
            transition: all 0.2s ease;
            box-shadow: 0 2px 8px rgba(0, 242, 255, 0.2);
            font-family: 'Outfit', sans-serif;
            flex-shrink: 0;
            margin-top: 0.5rem;
        }
        .download-btn:hover {
            opacity: 0.9;
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(0, 242, 255, 0.35);
        }
        .download-btn:active {
            transform: translateY(0);
        }
        body.light-theme .download-btn {
            color: #ffffff;
            background: linear-gradient(135deg, #026469, #009eb0);
            box-shadow: 0 2px 8px rgba(0, 158, 176, 0.15);
        }

        /* Modal Overlay Styles */
        .modal-overlay {
            display: flex;
            visibility: hidden;
            pointer-events: none;
            position: fixed;
            z-index: 9999;
            left: 0;
            top: 0;
            width: 100vw;
            height: 100vh;
            background-color: rgba(7, 10, 19, 0.95);
            align-items: center;
            justify-content: center;
            cursor: zoom-out;
            opacity: 0;
            transition: opacity 0.25s ease, visibility 0.25s ease;
        }
        .modal-overlay.show {
            opacity: 1;
            visibility: visible;
            pointer-events: auto;
        }
        .modal-content {
            border-radius: 12px;
            border: 1px solid var(--border);
            box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
            cursor: default;
            transform: scale(0.95);
            transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .modal-overlay.show .modal-content {
            transform: scale(1);
        }
        .modal-close {
            position: absolute;
            top: 1.5rem;
            right: 2rem;
            color: var(--text-secondary);
            font-size: 2.5rem;
            font-weight: bold;
            cursor: pointer;
            transition: color 0.2s;
            user-select: none;
        }
        .modal-close:hover {
            color: var(--accent-cyan);
        }
        .schema-modal-overlay {
            background: rgba(5, 8, 16, 0.88);
            backdrop-filter: blur(5px);
        }
        .schema-modal-content {
            width: min(96vw, 1680px);
            height: min(94vh, 1080px);
            padding: 1rem;
            border: 0;
            border-radius: 0;
            background: transparent;
            box-shadow: none;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .schema-modal-content img {
            display: block;
            width: 100%;
            height: 100%;
            object-fit: contain;
        }
        .schema-modal-close {
            z-index: 1;
            border: 0;
            background: transparent;
            line-height: 1;
        }

        body.modal-open {
            overflow: hidden;
        }
        .submit-overlay {
            position: fixed;
            inset: 0;
            display: none;
            background: rgba(7, 10, 19, 0.56);
            backdrop-filter: blur(3px);
            z-index: 9000;
        }
        .submit-overlay.show {
            display: block;
        }
        body.light-theme .submit-overlay {
            background: rgba(15, 23, 42, 0.32);
        }
        .submit-panel {
            position: fixed;
            top: 0;
            right: 0;
            z-index: 9001;
            width: 430px;
            max-width: 96vw;
            height: 100vh;
            display: flex;
            flex-direction: column;
            gap: 1rem;
            padding: 1.25rem;
            background: var(--bg-secondary);
            border-left: 1px solid var(--border);
            box-shadow: -14px 0 42px rgba(0, 0, 0, 0.34);
            overflow-y: auto;
            transform: translateX(105%);
            visibility: hidden;
            transition: transform 0.24s ease, visibility 0.24s ease;
        }
        .submit-panel.show {
            transform: translateX(0);
            visibility: visible;
        }
        .submit-panel-header {
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            gap: 1rem;
            padding-bottom: 0.9rem;
            border-bottom: 1px solid var(--border);
            flex-shrink: 0;
        }
        .submit-panel-header h3 {
            margin: 0;
            color: var(--text-primary);
            font-size: 1.12rem;
            font-weight: 700;
            letter-spacing: 0;
        }
        .submit-panel-subtitle {
            margin: 0.25rem 0 0 0;
            color: var(--text-secondary);
            font-size: 0.78rem;
            line-height: 1.4;
        }
        .submit-type-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0.5rem;
        }
        .submit-type-btn {
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 0.55rem 0.45rem;
            background: var(--bg-tertiary);
            color: var(--text-secondary);
            cursor: pointer;
            font-family: inherit;
            font-size: 0.82rem;
            font-weight: 700;
        }
        .submit-type-btn:hover {
            border-color: var(--accent-cyan);
            color: var(--text-primary);
        }
        .submit-type-btn.active {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            background: rgba(0, 242, 255, 0.08);
        }
        .submit-form {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        .submit-field {
            display: flex;
            flex-direction: column;
            gap: 0.35rem;
        }
        .submit-label-text {
            color: var(--text-primary);
            font-size: 0.82rem;
            font-weight: 700;
        }
        .submit-required {
            color: var(--accent-red);
            margin-left: 2px;
        }
        .submit-optional {
            color: var(--text-secondary);
            font-weight: 400;
        }
        .submit-textarea {
            min-height: 3.2rem;
            resize: vertical;
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.8rem;
            line-height: 1.45;
        }
        .submit-balance-status {
            min-height: 1rem;
            color: var(--text-secondary);
            font-size: 0.76rem;
        }
        .submit-field-hint {
            color: var(--text-secondary);
            font-size: 0.73rem;
            line-height: 1.4;
        }
        .submit-field-hint code {
            border: 1px solid var(--border);
            border-radius: 3px;
            padding: 0 4px;
            background: var(--bg-tertiary);
            font-size: 0.7rem;
        }
        .submit-actions {
            display: flex;
            justify-content: flex-end;
            gap: 0.75rem;
        }
        .submit-cancel-btn {
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 0.5rem 1rem;
            background: transparent;
            color: var(--text-secondary);
            cursor: pointer;
            font-family: inherit;
            font-size: 0.85rem;
        }
        .submit-cancel-btn:hover {
            border-color: var(--accent-red);
            color: var(--accent-red);
        }
        .submit-send-btn {
            min-width: 6rem;
        }
        .submit-send-btn:disabled {
            cursor: wait;
            opacity: 0.68;
        }
        .submit-feedback {
            display: none;
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 0.6rem 0.75rem;
            font-size: 0.82rem;
            line-height: 1.4;
        }
        .submit-feedback.show {
            display: block;
        }
        .submit-feedback.success {
            border-color: var(--accent-green);
            color: var(--accent-green);
            background: rgba(16, 185, 129, 0.08);
        }
        .submit-feedback.error {
            border-color: var(--accent-red);
            color: var(--accent-red);
            background: rgba(239, 68, 68, 0.08);
        }
        .sketch-modal-overlay {
            padding: 1.5rem;
            cursor: default;
            background: rgba(7, 10, 19, 0.86);
            backdrop-filter: blur(10px);
        }
        body.light-theme .sketch-modal-overlay {
            background: rgba(15, 23, 42, 0.38);
        }
        .sketch-modal-card {
            width: min(1320px, 96vw);
            height: min(900px, 92vh);
            display: flex;
            flex-direction: column;
            gap: 1rem;
            padding: 1rem;
            background: var(--bg-secondary);
            overflow: hidden;
        }
        .sketch-modal-header {
            display: flex;
            align-items: flex-start;
            justify-content: space-between;
            gap: 1rem;
            padding-bottom: 0.75rem;
            border-bottom: 1px solid var(--border);
            flex-shrink: 0;
        }
        .sketch-modal-header h3 {
            margin: 0;
            color: var(--accent-cyan);
            font-size: 1.15rem;
            font-weight: 700;
            letter-spacing: 0;
        }
        .sketch-modal-header p {
            margin: 0.25rem 0 0 0;
            color: var(--text-secondary);
            font-size: 0.85rem;
        }
        .sketch-close-btn {
            width: 2.2rem;
            height: 2.2rem;
            border-radius: 6px;
            border: 1px solid var(--border);
            background: var(--bg-tertiary);
            color: var(--text-primary);
            cursor: pointer;
            font-size: 1.35rem;
            line-height: 1;
            flex: 0 0 auto;
        }
        .sketch-close-btn:hover,
        .sketch-close-btn:focus-visible {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            outline: none;
        }
        .sketch-editor-host {
            width: 100%;
            flex: 1 1 auto;
            min-height: 520px;
            border: 1px solid var(--border);
            border-radius: 8px;
            overflow: hidden;
            background: #ffffff;
        }
        .sketch-modal-footer {
            display: grid;
            grid-template-columns: minmax(0, 1fr) auto;
            gap: 0.75rem;
            align-items: stretch;
            flex-shrink: 0;
        }
        .sketch-rsmi-input {
            min-height: 4.5rem;
            resize: vertical;
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.82rem;
        }
        .sketch-search-btn {
            min-width: 11rem;
            height: auto;
        }

        /* Welcome Dashboard Styles */
        .welcome-container {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: flex-start;
            height: 100%;
            padding: 3rem 2.25rem;
            text-align: center;
            overflow-y: auto;
            background: linear-gradient(180deg, rgba(0, 242, 255, 0.035), transparent 22rem);
        }
        .welcome-container h2 {
            font-size: 2.1rem;
            margin-bottom: 0.65rem;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            font-weight: 700;
        }
        .welcome-container p {
            color: var(--text-secondary);
            margin-bottom: 1.9rem;
            font-size: 1rem;
            max-width: 600px;
        }
        .dashboard-grid {
            display: grid;
            grid-template-columns: repeat(6, minmax(0, 1fr));
            gap: 1rem;
            justify-content: center;
            width: 100%;
            max-width: 980px;
            margin-bottom: 1.2rem;
        }
        .dash-card {
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 1rem 0.9rem;
            box-shadow: var(--card-shadow);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            min-width: 0;
        }
        .dash-card:hover {
            border-color: var(--accent-cyan);
            transform: translateY(-4px);
            box-shadow: 0 12px 24px rgba(128, 128, 128, 0.1);
        }
        .dash-card h3 {
            font-size: 1.85rem;
            color: var(--text-primary);
            margin-bottom: 0.25rem;
            background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            white-space: nowrap;
        }
        .dash-card p {
            font-size: 0.76rem;
            color: var(--text-secondary);
            margin-bottom: 0;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }
        .quickstart-box {
            text-align: left;
            max-width: 980px;
            width: 100%;
            background: color-mix(in srgb, var(--bg-tertiary) 72%, transparent);
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 1rem 1.25rem;
            font-size: 0.9rem;
        }
        .quickstart-box h4 {
            color: var(--accent-cyan);
            margin-bottom: 0.75rem;
            text-transform: uppercase;
            font-size: 0.8rem;
            letter-spacing: 0.05em;
        }
        .quickstart-box ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(3, minmax(0, 1fr));
            gap: 0.75rem;
        }
        .quickstart-box li::before {
            content: "✦ ";
            color: var(--accent-purple);
        }
        .surprise-btn {
            margin: 0;
            padding: 0.55rem 1.15rem;
            font-size: 0.84rem;
            border-radius: 7px;
        }
        .home-insights {
            max-width: 980px;
            width: 100%;
            margin: 0 0 1rem;
            text-align: left;
            display: none;
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 1rem;
            box-shadow: var(--card-shadow);
        }
        .home-insights-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 0.8rem;
        }
        .home-insights-header h3 {
            margin: 0;
            color: var(--accent-cyan);
            font-size: 0.95rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }
        .home-insights-body {
            display: grid;
            grid-template-columns: repeat(2, minmax(0, 1fr));
            gap: 0.85rem;
            align-items: start;
        }
        .insight-chart-wide {
            grid-column: 1 / -1;
        }
        .insight-chart {
            background: var(--bg-primary);
            padding: 0.95rem;
            border-radius: 8px;
            border: 1px solid var(--border);
            box-shadow: none;
            min-width: 0;
            min-height: 0;
            overflow: hidden;
            cursor: default;
            transition: border-color 0.18s, transform 0.18s;
        }
        .insight-chart:hover {
            border-color: var(--accent-cyan);
            transform: translateY(-1px);
        }
        body.light-theme .insight-chart {
            box-shadow: 0 8px 24px rgba(15,23,42,0.08);
        }
        .insight-title-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 0.75rem;
            margin-bottom: 0.75rem;
        }
        .insight-title-actions,
        .chart-modal-actions {
            display: flex;
            align-items: center;
            justify-content: flex-end;
            gap: 0.4rem;
            flex-wrap: wrap;
        }
        .insight-action {
            border: 1px solid var(--border);
            border-radius: 5px;
            background: var(--bg-tertiary);
            color: var(--text-secondary);
            padding: 0.2rem 0.42rem;
            font: inherit;
            font-size: 0.65rem;
            cursor: pointer;
        }
        .insight-action:hover,
        .insight-action:focus-visible {
            border-color: var(--series-1);
            color: var(--text-primary);
        }
        .insight-title {
            font-size: 0.78rem;
            font-weight: 700;
            color: #d7deea;
            text-transform: uppercase;
            margin: 0;
            letter-spacing: 0.02em;
        }
        .insight-open-hint {
            color: var(--accent-cyan);
            font-size: 0.68rem;
            font-weight: 700;
            white-space: nowrap;
            opacity: 0;
            transition: opacity 0.18s;
        }
        .insight-chart:hover .insight-open-hint,
        .insight-chart:focus .insight-open-hint {
            opacity: 1;
        }
        .insight-chart svg {
            display: block;
            width: 100%;
            height: auto;
            overflow: visible;
        }
        .chart-label,
        .chart-value {
            font-family: 'Outfit', sans-serif;
            font-size: 0.78rem;
            font-weight: 800;
            paint-order: stroke;
            fill: #edf4ff;
            stroke: #050914;
            stroke-width: 2.5px;
            stroke-linejoin: round;
        }
        .insight-empty {
            color: var(--text-secondary);
            font-size: 0.8rem;
            margin: 0;
        }
        .insight-caption {
            color: var(--text-secondary);
            font-size: 0.72rem;
            line-height: 1.4;
            margin: 0.6rem 0 0;
            max-width: none;
        }
        .insight-error {
            display: grid;
            justify-items: start;
            gap: 0.65rem;
            color: var(--accent-red);
            font-size: 0.8rem;
            padding: 0.8rem 0;
        }
        .insight-table-wrap {
            max-height: 19rem;
            overflow: auto;
            border: 1px solid var(--border);
            border-radius: 6px;
        }
        .insight-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.74rem;
            color: var(--text-primary);
        }
        .insight-table th,
        .insight-table td {
            padding: 0.42rem 0.5rem;
            border-bottom: 1px solid var(--border);
            text-align: left;
        }
        .insight-table th {
            position: sticky;
            top: 0;
            background: var(--bg-tertiary);
            color: var(--text-secondary);
            font-weight: 700;
        }
        .insight-mark {
            cursor: pointer;
        }
        .insight-mark:focus {
            outline: none;
            stroke: var(--text-primary);
            stroke-width: 3px;
        }
        .chart-median-line {
            stroke: var(--series-2);
            stroke-width: 2px;
            stroke-dasharray: 5 3;
        }
        .chart-median-label {
            fill: var(--series-2);
            font-size: 0.7rem;
            font-weight: 700;
        }
        .chart-axis-label,
        .meter-detail {
            fill: var(--text-secondary);
            font-family: 'Outfit', sans-serif;
            font-size: 0.7rem;
            font-weight: 700;
            letter-spacing: 0.04em;
        }
        .matrix-count {
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.9rem;
            font-weight: 800;
            pointer-events: none;
        }
        .result-card-smiles {
            color: var(--text-secondary);
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.72rem;
            margin: 0.25rem 0 0;
            overflow-wrap: anywhere;
        }
        .dashboard-inline-error {
            grid-column: 1 / -1;
        }
        .chart-axis text {
            fill: #c8d2e1;
            font-family: 'Outfit', sans-serif;
            font-size: 0.72rem;
            font-weight: 800;
        }
        .chart-axis line {
            stroke: #334155;
            opacity: 0.95;
        }
        .chart-axis path {
            stroke: transparent;
        }
        .chart-tooltip {
            position: fixed;
            z-index: 3000;
            max-width: min(320px, calc(100vw - 2rem));
            padding: 0.55rem 0.7rem;
            border-radius: 7px;
            border: 1px solid color-mix(in srgb, var(--accent-cyan) 40%, var(--border));
            background: color-mix(in srgb, var(--bg-secondary) 94%, #000);
            color: var(--text-primary);
            box-shadow: 0 14px 34px rgba(0,0,0,0.34);
            font-size: 0.78rem;
            line-height: 1.35;
            pointer-events: none;
            opacity: 0;
            transform: translateY(4px);
            transition: opacity 0.12s, transform 0.12s;
        }
        .chart-tooltip.show {
            opacity: 1;
            transform: translateY(0);
        }
        .chart-modal-content {
            width: min(94vw, 1320px);
            height: min(90vh, 940px);
            background: color-mix(in srgb, var(--bg-secondary) 96%, #000);
            border: 1px solid color-mix(in srgb, var(--accent-cyan) 18%, var(--border));
            border-radius: 10px;
            padding: 1.2rem;
            display: flex;
            flex-direction: column;
            overflow: hidden;
            box-shadow: 0 24px 60px rgba(0,0,0,0.48);
        }
        .chart-modal-header {
            display: flex;
            align-items: baseline;
            justify-content: space-between;
            gap: 1rem;
            border-bottom: 1px solid var(--border);
            padding-bottom: 0.85rem;
            margin-bottom: 1rem;
        }
        .chart-modal-header h3 {
            margin: 0;
            color: var(--accent-cyan);
            font-size: 1.1rem;
        }
        .chart-modal-header p {
            margin: 0;
            color: var(--text-secondary);
            font-size: 0.82rem;
        }
        .chart-modal-actions p {
            margin: 0;
        }
        .chart-modal-body {
            flex: 1;
            overflow: auto;
            background: #050914;
            border: 1px solid color-mix(in srgb, var(--accent-cyan) 12%, var(--border));
            border-radius: 8px;
            padding: 1.2rem;
        }
        .chart-modal-body .insight-title-row {
            display: none;
        }
        .chart-modal-body svg {
            display: block;
            width: min(100%, 1100px);
            min-height: clamp(320px, 62vh, 620px);
            height: auto;
            margin: 0 auto;
            overflow: visible;
        }
        .chart-modal-body svg.chart-vertical {
            max-width: 1000px;
        }
        .chart-modal-body [data-chart-caption] {
            pointer-events: all;
            cursor: crosshair;
        }
        body.light-theme .chart-tooltip {
            background: #ffffff;
            box-shadow: 0 14px 34px rgba(15,23,42,0.18);
        }
        body.light-theme .chart-modal-content {
            background: #ffffff;
            box-shadow: 0 24px 60px rgba(15,23,42,0.2);
        }
        body.light-theme .chart-modal-body {
            background: #f8fafc;
        }
        body.light-theme .chart-label,
        body.light-theme .chart-value {
            fill: #0f172a;
            stroke: #ffffff;
        }
        body.light-theme .insight-chart {
            background: #ffffff;
            border-color: #cbd5e1;
        }
        body.light-theme .insight-title {
            color: #334155;
        }
        body.light-theme .chart-axis text {
            fill: #334155;
        }
        body.light-theme .chart-axis line {
            stroke: #cbd5e1;
        }
        .top-taxon-row {
            display: grid;
            grid-template-columns: minmax(0, 1fr) auto;
            gap: 0.65rem;
            align-items: center;
            padding: 0.42rem 0;
            font-size: 0.8rem;
            border-bottom: 1px solid var(--border);
        }
        .top-taxon-row:last-child {
            border-bottom: 0;
        }
        .top-taxon-row button {
            min-width: 0;
            border: 0;
            padding: 0;
            background: transparent;
            color: var(--accent-cyan);
            font: inherit;
            text-align: left;
            cursor: pointer;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        .top-taxon-row button:hover {
            text-decoration: underline;
        }
        .top-taxon-row span {
            color: var(--text-secondary);
            font-size: 0.76rem;
            white-space: nowrap;
        }

        /* SVG styles for D3 graph */
        svg {
            width: 100%;
            height: 100%;
        }
        .node circle {
            stroke: var(--bg-secondary);
            stroke-width: 1.5px;
            transition: fill 0.3s, stroke 0.3s;
        }
        .node text {
            font-family: 'Outfit', sans-serif;
            font-weight: 700;
            pointer-events: none;
            fill: #fff;
        }
        .node .map-label {
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.65rem;
            fill: var(--text-secondary);
            font-weight: 400;
        }
.link {
            stroke-opacity: 0.6;
            transition: stroke 0.3s, stroke-width 0.3s;
        }
        .link.breaking {
            stroke: var(--accent-red);
            stroke-dasharray: 4 4;
            stroke-width: 3.5px;
        }
        .link.forming {
            stroke: var(--accent-green);
            stroke-dasharray: 4 4;
            stroke-width: 3.5px;
        }
        .link.transition {
            stroke: var(--accent-pink);
            stroke-width: 3px;
        }
        .link.unchanged {
            stroke: #4b5563;
            stroke-width: 2px;
        }
        .link.mechanism-transition {
            stroke: var(--accent-pink);
            stroke-width: 3px;
            stroke-dasharray: 7 4;
        }
        .link.mechanism-context {
            stroke: var(--text-secondary);
            stroke-width: 1.5px;
            stroke-dasharray: 2 5;
        }
        .node.mechanism-epd_context circle {
            stroke: var(--accent-cyan) !important;
            stroke-width: 3px !important;
            stroke-dasharray: 4 3 !important;
        }
        .node.mechanism-normalization_context circle {
            stroke: var(--accent-orange) !important;
            stroke-width: 2.5px !important;
        }

        /* EPD Arrow representation */
        .epd-arrow {
            fill: none;
            stroke: var(--accent-cyan);
            stroke-width: 3.5px;
            stroke-dasharray: 8 6;
            animation: flow 1.5s linear infinite;
            filter: drop-shadow(0 0 5px var(--accent-cyan));
        }
        .link-label {
            pointer-events: none;
            font-family: 'JetBrains Mono', monospace;
            font-size: 8px;
            fill: var(--text-secondary);
            paint-order: stroke;
            stroke: var(--bg-primary);
            stroke-width: 3px;
            stroke-linejoin: round;
        }

        @keyframes flow {
            from {
                stroke-dashoffset: 28;
            }
            to {
                stroke-dashoffset: 0;
            }
        }

        /* Toast notifications — stack system */
        #toast-stack {
            position: fixed;
            top: 1.5rem;
            right: 1.5rem;
            z-index: 9999;
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
            pointer-events: none;
        }
        .toast-item {
            border-radius: 8px;
            padding: 0.75rem 1.25rem;
            font-size: 0.85rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            box-shadow: var(--card-shadow);
            animation: slideIn 0.25s ease;
            min-width: 220px;
            max-width: 320px;
            pointer-events: auto;
            background: var(--bg-secondary);
            color: var(--text-primary);
        }
        @keyframes slideIn {
            from { transform: translateX(100%); opacity: 0; }
            to { transform: translateX(0); opacity: 1; }
        }
        @keyframes skeleton-pulse {
            0%   { opacity: 0.4; }
            50%  { opacity: 0.8; }
            100% { opacity: 0.4; }
        }
        .skeleton {
            background: var(--bg-tertiary);
            border-radius: 6px;
            animation: skeleton-pulse 1.4s ease-in-out infinite;
        }
        /* Graph Legend */
        .graph-legend {
            position: absolute;
            top: 1rem;
            right: 1rem;
            background: rgba(16, 21, 36, 0.92);
            backdrop-filter: blur(10px);
            border: 1px solid var(--border);
            border-radius: 10px;
            padding: 0.75rem 1rem;
            z-index: 20;
            min-width: 160px;
            font-size: 0.8rem;
            color: var(--text-primary);
        }
        body.light-theme .graph-legend {
            background: rgba(255,255,255,0.92);
        }
        .legend-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            font-size: 0.82rem;
            margin-bottom: 0.5rem;
            color: var(--accent-cyan);
            user-select: none;
        }
        .legend-section { margin-top: 0.4rem; }
        .legend-title {
            font-size: 0.72rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            color: var(--text-secondary);
            margin-bottom: 0.3rem;
            font-weight: 600;
        }
        .legend-row {
            display: flex;
            align-items: center;
            gap: 0.4rem;
            margin-bottom: 0.25rem;
            font-size: 0.78rem;
        }
        .legend-swatch {
            display: inline-block;
            width: 24px;
            height: 4px;
            border-radius: 2px;
            flex-shrink: 0;
        }
        .legend-swatch.breaking  { border-top: 3px dashed var(--accent-red);    background: none; height: 0; }
        .legend-swatch.forming   { border-top: 3px dashed var(--accent-green);  background: none; height: 0; }
        .legend-swatch.transition  { background: var(--accent-pink); height: 3px; }
        .legend-swatch.unchanged { background: #4b5563; height: 2px; }
        /* Atom Tooltip */
        .atom-tooltip {
            position: fixed;
            background: var(--bg-secondary);
            border: 1px solid var(--accent-cyan);
            border-radius: 6px;
            padding: 0.4rem 0.7rem;
            font-size: 0.78rem;
            font-family: 'JetBrains Mono', monospace;
            color: var(--text-primary);
            pointer-events: none;
            z-index: 9000;
            box-shadow: 0 4px 12px rgba(0,0,0,0.4);
            display: none;
        }
        /* Breadcrumb */
        .breadcrumb-bar {
            display: flex;
            align-items: center;
            gap: 0.35rem;
            font-size: 0.75rem;
            color: var(--text-secondary);
            padding: 0.35rem 0;
            margin-bottom: 0.75rem;
            flex-wrap: wrap;
        }
        .breadcrumb-bar a {
            color: var(--accent-cyan);
            cursor: pointer;
            text-decoration: none;
            font-family: 'JetBrains Mono', monospace;
        }
        .breadcrumb-bar a:hover { text-decoration: underline; }
        .breadcrumb-bar .sep { color: var(--border); }
        /* Taxonomy count badge */
        .tree-count-badge {
            margin-left: auto;
            font-size: 0.68rem;
            background: var(--bg-primary);
            border: 1px solid var(--border);
            color: var(--text-secondary);
            padding: 1px 6px;
            border-radius: 999px;
            font-family: 'JetBrains Mono', monospace;
            flex-shrink: 0;
        }
        /* Search result meta / pagination */
        .search-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.78rem;
            color: var(--text-secondary);
            margin-bottom: 0.75rem;
            padding-bottom: 0.5rem;
            border-bottom: 1px solid var(--border);
        }
        .load-more-btn {
            background: transparent;
            border: 1px solid var(--border);
            color: var(--accent-cyan);
            font-size: 0.75rem;
            padding: 2px 8px;
            border-radius: 6px;
            cursor: pointer;
            font-family: inherit;
            transition: all 0.2s;
        }
        .load-more-btn:hover { border-color: var(--accent-cyan); background: rgba(0,242,255,0.06); }
        /* Keyboard hint bar */
        .kbd-hint {
            font-size: 0.72rem;
            color: var(--text-secondary);
            font-family: 'JetBrains Mono', monospace;
            white-space: nowrap;
            display: flex;
            gap: 0.75rem;
            align-items: center;
        }
        .kbd-hint kbd {
            display: inline-block;
            background: var(--bg-tertiary);
            border: 1px solid var(--border);
            border-radius: 3px;
            padding: 0 4px;
            font-size: 0.7rem;
            font-family: 'JetBrains Mono', monospace;
        }
        @media (prefers-reduced-motion: reduce) {
            *, *::before, *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                scroll-behavior: auto !important;
                transition-duration: 0.01ms !important;
            }
        }
        /* Responsive breakpoints */
        @media (max-width: 1100px) {
            .left-panel  { width: 300px; }
            .right-panel { width: 340px; }
            .graph-controls {
                padding: 0.65rem 0.85rem;
                gap: 0.55rem;
            }
            .step-indicator {
                min-width: 68px;
                font-size: 0.82rem;
            }
        }
        @media (max-width: 860px) {
            body {
                height: auto;
                min-height: 100vh;
                overflow: auto;
            }
            .app-header {
                position: sticky;
                top: 0;
                flex-wrap: wrap;
                padding: 0.6rem 0.85rem;
            }
            .brand-home h1 {
                font-size: 1rem;
            }
            .brand-mark {
                width: 1.8rem;
                height: 1.8rem;
            }
            .header-actions {
                gap: 0.5rem;
            }
            .db-status-badge {
                max-width: 9rem;
                overflow: hidden;
                text-overflow: ellipsis;
            }
            .theme-toggle-btn {
                padding: 0.35rem 0.65rem;
            }
            .submit-btn {
                padding: 0.38rem 0.65rem;
            }
            .submit-panel {
                width: 100%;
                max-width: 100vw;
                padding: 1rem;
            }
            .submit-type-row {
                grid-template-columns: 1fr;
            }
            .submit-actions {
                flex-direction: column-reverse;
            }
            .submit-cancel-btn,
            .submit-send-btn {
                width: 100%;
                min-height: 2.75rem;
            }
            .workspace {
                flex-direction: column;
                min-height: calc(100vh - 3.1rem);
                overflow: visible;
            }
            .left-panel, .right-panel {
                width: 100%;
                height: auto;
                max-height: none;
                border-right: none;
                border-left: none;
                border-bottom: 1px solid var(--border);
            }
            .left-panel {
                min-height: 18rem;
            }
            .right-panel {
                min-height: 24rem;
                padding: 1rem;
            }
            .center-panel {
                flex: none;
                min-height: 32rem;
            }
            .graph-viewport {
                min-height: 28rem;
            }
            .tab-bar {
                overflow-x: auto;
                scrollbar-width: thin;
            }
            .tab-btn {
                flex: 0 0 auto;
                min-width: 6.5rem;
            }
            .tab-content-container {
                padding: 1rem;
            }
            .sketch-modal-overlay {
                padding: 0.6rem;
            }
            .sketch-modal-card {
                width: 100%;
                height: 94vh;
                padding: 0.75rem;
                gap: 0.75rem;
            }
            .sketch-editor-host {
                min-height: 380px;
            }
            .sketch-modal-footer {
                grid-template-columns: 1fr;
            }
            .sketch-search-btn {
                width: 100%;
                min-height: 2.75rem;
            }
            .graph-controls {
                position: sticky;
                left: auto;
                bottom: 0.75rem;
                transform: none;
                margin: 0.75rem auto;
                width: calc(100% - 1rem);
                overflow-x: auto;
                justify-content: flex-start;
            }
            .graph-legend {
                max-width: calc(100% - 2rem);
            }
            .welcome-container {
                justify-content: flex-start;
                padding: 1.5rem 1rem;
                overflow: visible;
            }
            .welcome-container h2 {
                font-size: 1.7rem;
            }
            .welcome-container p {
                font-size: 0.95rem;
                margin-bottom: 1.5rem;
            }
            .dashboard-grid {
                grid-template-columns: repeat(2, minmax(0, 1fr));
                gap: 0.75rem;
                margin-bottom: 1.5rem;
            }
            .quickstart-box {
                padding: 1rem;
            }
            .home-insights {
                max-width: 100%;
            }
            .home-insights-body {
                grid-template-columns: 1fr;
            }
            .chart-modal-content {
                width: calc(100vw - 1rem);
                height: calc(100vh - 1rem);
                padding: 0.8rem;
            }
            .chart-modal-header {
                align-items: flex-start;
                flex-direction: column;
                gap: 0.35rem;
                margin-bottom: 0.75rem;
                padding-bottom: 0.7rem;
            }
            .chart-modal-body {
                padding: 0.75rem;
            }
            .chart-modal-body svg {
                min-width: 620px;
                min-height: 420px;
            }
        }
        @media (max-width: 520px) {
            .app-header {
                gap: 0.55rem;
            }
            .header-actions {
                width: 100%;
                justify-content: space-between;
            }
            .brand-home {
                width: 100%;
            }
            .dashboard-grid {
                grid-template-columns: 1fr;
            }
            .chart-modal-body svg {
                min-width: 560px;
                min-height: 360px;
            }
            .chart-tooltip {
                font-size: 0.74rem;
            }
            .structure-arrow {
                line-height: 1;
                padding: 0;
                text-align: center;
            }
        }
        .section-collapsible { margin-bottom: 1.25rem; }
        .section-toggle {
            background: none;
            border: none;
            color: var(--accent-cyan);
            font-family: 'Outfit', sans-serif;
            font-size: 0.85rem;
            font-weight: 600;
            cursor: pointer;
            padding: 0;
            display: flex;
            align-items: center;
            gap: 0.35rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            margin-bottom: 0.5rem;
        }
        .section-toggle-body { overflow: hidden; }
        .linked-data-group {
            display: flex;
            flex-direction: column;
            gap: 0.45rem;
            margin-bottom: 0.75rem;
        }
        .linked-data-group:last-child { margin-bottom: 0; }
        .linked-data-group h4 {
            margin: 0 0 0.1rem;
            color: var(--text-secondary);
            font-size: 0.72rem;
            letter-spacing: 0.03em;
            text-transform: uppercase;
        }
        .linked-data-row {
            display: grid;
            grid-template-columns: minmax(90px, auto) 1fr;
            gap: 0.35rem 0.6rem;
            align-items: center;
            border: 1px solid var(--border);
            border-radius: 6px;
            padding: 0.45rem 0.55rem;
            background: var(--bg-tertiary);
            font-size: 0.72rem;
        }
        .linked-data-row.ontology-row {
            grid-template-columns: auto minmax(0, 1fr);
        }
        .linked-data-row > small {
            grid-column: 2;
            color: var(--text-secondary);
            font-size: 0.65rem;
        }
        .linked-data-relation {
            color: var(--text-secondary);
            font-size: 0.66rem;
            text-transform: capitalize;
        }
        .linked-reaction-target {
            display: flex;
            min-width: 0;
            flex-direction: column;
            align-items: flex-start;
            border: 0;
            padding: 0;
            background: none;
            color: var(--accent-cyan);
            cursor: pointer;
            font: inherit;
            text-align: left;
        }
        .linked-reaction-target:hover { text-decoration: underline; }
        .linked-reaction-target small {
            color: var(--text-secondary);
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.62rem;
        }
        .linked-data-description {
            min-width: 0;
            overflow: hidden;
            color: var(--text-primary);
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        .ontology-release-link {
            width: fit-content;
            font-size: 0.66rem;
        }
        /* v2 enhancements styling */
        .change-badge {
            font-size: 0.72rem;
            font-weight: 600;
            padding: 2px 8px;
            border-radius: 999px;
            border: 1px solid;
            display: inline-block;
        }
        .change-badge.breaking { color: var(--accent-red);    border-color: var(--accent-red);    background: rgba(239,68,68,0.1); }
        .change-badge.forming  { color: var(--accent-green);  border-color: var(--accent-green);  background: rgba(16,185,129,0.1); }
        .change-badge.transition { color: var(--accent-pink); border-color: var(--accent-pink); background: rgba(236,72,153,0.1); }