:root {
            --bg-base: #080b11;
            --bg-card: rgba(18, 24, 38, 0.85);
            --bg-card-hover: rgba(26, 35, 56, 0.95);
            --border-subtle: rgba(70, 90, 130, 0.25);
            --border-active: rgba(0, 240, 255, 0.6);
            --text-main: #f0f4fc;
            --text-dim: #8a9bb8;
            --accent-cyan: #00f0ff;
            --accent-green: #00ff88;
            --accent-amber: #ffb800;
            --accent-red: #ff3366;
            --accent-purple: #b055ff;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            -webkit-font-smoothing: antialiased;
        }

        body {
            background-color: var(--bg-base);
            color: var(--text-main);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            overflow-x: hidden;
        }

        /* Top Header */
        header {
            background: rgba(12, 16, 26, 0.9);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-subtle);
            padding: 12px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .brand-logo {
            width: 32px;
            height: 32px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-green));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 900;
            color: #000;
            font-size: 16px;
            box-shadow: 0 0 16px rgba(0, 240, 255, 0.4);
        }

        .brand-title {
            font-size: 18px;
            font-weight: 700;
            letter-spacing: 0.5px;
        }

        .brand-subtitle {
            font-size: 11px;
            color: var(--text-dim);
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .header-meta {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .badge {
            font-size: 11px;
            padding: 4px 10px;
            border-radius: 6px;
            font-weight: 600;
            letter-spacing: 0.5px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .badge-verified {
            background: rgba(0, 255, 136, 0.15);
            color: var(--accent-green);
            border: 1px solid rgba(0, 255, 136, 0.3);
        }

        .badge-gpu {
            background: rgba(0, 240, 255, 0.15);
            color: var(--accent-cyan);
            border: 1px solid rgba(0, 240, 255, 0.3);
        }

        .badge-state {
            background: rgba(255, 184, 0, 0.15);
            color: var(--accent-amber);
            border: 1px solid rgba(255, 184, 0, 0.3);
        }

        .dot-pulse {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: currentColor;
            box-shadow: 0 0 8px currentColor;
        }

        /* Nav Tabs */
        nav {
            display: flex;
            gap: 4px;
            background: rgba(14, 20, 32, 0.8);
            border-bottom: 1px solid var(--border-subtle);
            padding: 0 24px;
        }

        .nav-tab {
            padding: 12px 18px;
            background: transparent;
            border: none;
            border-bottom: 2px solid transparent;
            color: var(--text-dim);
            font-size: 13px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .nav-tab:hover {
            color: var(--text-main);
        }

        .nav-tab.active {
            color: var(--accent-cyan);
            border-bottom-color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.05);
        }

        /* Main Workspace */
        main {
            flex: 1;
            padding: 24px;
            max-width: 1600px;
            margin: 0 auto;
            width: 100%;
        }

        .tab-content {
            display: none;
        }

        .tab-content.active {
            display: block;
            animation: fadeIn 0.25s ease forwards;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(4px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* Grid Layouts */
        .grid-overview {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
            margin-bottom: 24px;
        }

        .card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: 12px;
            padding: 20px;
            backdrop-filter: blur(8px);
            position: relative;
        }

        .card-header {
            font-size: 12px;
            color: var(--text-dim);
            text-transform: uppercase;
            letter-spacing: 0.8px;
            margin-bottom: 8px;
            display: flex;
            justify-content: space-between;
        }

        .card-value {
            font-size: 26px;
            font-weight: 700;
            color: var(--text-main);
        }

        .card-subtext {
            font-size: 12px;
            color: var(--text-dim);
            margin-top: 6px;
        }

        /* 3D Connectome Container */
        .viewer-container {
            display: grid;
            grid-template-columns: 1fr 340px;
            gap: 20px;
            height: 680px;
        }

        #connectome-canvas-wrapper {
            background: #040609;
            border: 1px solid var(--border-subtle);
            border-radius: 12px;
            overflow: hidden;
            position: relative;
        }

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

        .viewer-controls-overlay {
            position: absolute;
            top: 16px;
            left: 16px;
            background: rgba(14, 20, 32, 0.85);
            backdrop-filter: blur(10px);
            border: 1px solid var(--border-subtle);
            border-radius: 8px;
            padding: 10px 14px;
            display: flex;
            gap: 10px;
            align-items: center;
            z-index: 10;
        }

        .inspector-panel {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: 12px;
            padding: 20px;
            display: flex;
            flex-direction: column;
            gap: 14px;
            overflow-y: auto;
        }

        .inspector-row {
            display: flex;
            justify-content: space-between;
            font-size: 13px;
            padding-bottom: 6px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }

        .inspector-label {
            color: var(--text-dim);
        }

        .inspector-val {
            font-weight: 600;
            color: var(--text-main);
            font-family: monospace;
        }

        /* Buttons & Controls */
        .btn {
            background: rgba(0, 240, 255, 0.15);
            color: var(--accent-cyan);
            border: 1px solid rgba(0, 240, 255, 0.4);
            padding: 8px 16px;
            border-radius: 6px;
            font-size: 12px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .btn:hover {
            background: rgba(0, 240, 255, 0.25);
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.3);
        }

        .btn-green {
            background: rgba(0, 255, 136, 0.15);
            color: var(--accent-green);
            border-color: rgba(0, 255, 136, 0.4);
        }

        .btn-green:hover {
            background: rgba(0, 255, 136, 0.25);
            box-shadow: 0 0 12px rgba(0, 255, 136, 0.3);
        }

        .btn-amber {
            background: rgba(255, 184, 0, 0.15);
            color: var(--accent-amber);
            border-color: rgba(255, 184, 0, 0.4);
        }

        select, input[type="text"], input[type="number"] {
            background: rgba(10, 15, 25, 0.9);
            border: 1px solid var(--border-subtle);
            color: var(--text-main);
            padding: 8px 12px;
            border-radius: 6px;
            font-size: 12px;
            outline: none;
        }

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

        /* Tables & Lists */
        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 13px;
        }

        th {
            text-align: left;
            padding: 10px 14px;
            color: var(--text-dim);
            border-bottom: 1px solid var(--border-subtle);
            font-size: 11px;
            text-transform: uppercase;
        }

        td {
            padding: 10px 14px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
            color: var(--text-main);
        }

        /* Toast Container */
        #toast-container {
            position: fixed;
            bottom: 24px;
            right: 24px;
            display: flex;
            flex-direction: column;
            gap: 8px;
            z-index: 9999;
        }

        .toast {
            background: rgba(18, 24, 38, 0.95);
            border: 1px solid var(--border-active);
            border-radius: 8px;
            padding: 12px 18px;
            font-size: 13px;
            color: var(--text-main);
            backdrop-filter: blur(12px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
            animation: slideIn 0.2s ease forwards;
        }

        @keyframes slideIn {
            from { transform: translateX(50px); opacity: 0; }
            to { transform: translateX(0); opacity: 1; }
        }

        /* Scientific provenance panel (v4.1) */
        .prov-grid {
            display: flex;
            flex-direction: column;
            gap: 10px;
            margin-top: 12px;
        }

        .prov-row {
            display: grid;
            grid-template-columns: 200px 1fr;
            gap: 12px;
            align-items: baseline;
            padding: 8px 0;
            border-bottom: 1px solid var(--border-subtle);
            font-size: 13px;
        }

        .prov-label {
            color: var(--text-dim);
            font-weight: 600;
            text-transform: uppercase;
            font-size: 11px;
            letter-spacing: 0.06em;
        }

        .prov-val {
            color: var(--text-main);
            line-height: 1.5;
        }

        .mono {
            font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
            font-size: 12px;
            word-break: break-all;
        }

        .tag {
            display: inline-block;
            padding: 2px 8px;
            border-radius: 20px;
            font-size: 11px;
            font-weight: 700;
            margin-right: 6px;
        }

        .tag-heuristic {
            background: rgba(255, 184, 0, 0.15);
            color: var(--accent-amber);
            border: 1px solid rgba(255, 184, 0, 0.4);
        }

        .tag-empirical {
            background: rgba(0, 255, 136, 0.12);
            color: var(--accent-green);
            border: 1px solid rgba(0, 255, 136, 0.35);
        }

        .tag-unknown {
            background: rgba(138, 155, 184, 0.12);
            color: var(--text-dim);
            border: 1px solid var(--border-subtle);
        }

        .btn-red {
            background: rgba(255, 51, 102, 0.15);
            border: 1px solid rgba(255, 51, 102, 0.5);
            color: var(--accent-red);
        }

        .btn-red:hover {
            background: rgba(255, 51, 102, 0.3);
        }

        /* Accessibility: visible focus + reduced motion */
        button:focus-visible, select:focus-visible, input:focus-visible, canvas:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        @media (prefers-reduced-motion: reduce) {
            .toast { animation: none; }
            .dot-pulse { animation: none; }
        }

        @media (max-width: 900px) {
            .prov-row { grid-template-columns: 1fr; }
            header { flex-direction: column; gap: 10px; }
        }