.section-category {
            color: var(--accent-purple);
            font-family: 'Orbitron', sans-serif;
            font-size: 0.75rem;
            text-transform: uppercase;
            letter-spacing: 2px;
            margin-bottom: 0.5rem;
        }

        /* Hardware Spec Cards */
        .hw-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 1.5rem;
            margin: 1.5rem 0;
        }
        .hw-card {
            background: var(--bg-card);
            border: 1px solid var(--border-glow);
            border-radius: 0;
            padding: 1.5rem;
            transition: border-color 0.2s;
        }
        .hw-card:hover {
            border-color: var(--primary-green);
        }
        .hw-card h3 {
            color: var(--primary-green);
            font-family: 'Orbitron', sans-serif;
            font-size: 0.95rem;
            margin-bottom: 0.75rem;
        }
        .hw-card .spec-row {
            display: flex;
            justify-content: space-between;
            padding: 0.35rem 0;
            border-bottom: 1px solid rgba(0, 255, 65, 0.1);
            font-size: 0.8rem;
        }
        .hw-card .spec-row:last-child { border-bottom: none; }
        .hw-card .spec-label { color: var(--text-secondary); }
        .hw-card .spec-value { color: var(--neon-cyan); font-family: 'JetBrains Mono', monospace; }

        /* Service List */
        .service-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1rem;
            margin: 1rem 0;
        }
        .service-item {
            background: rgba(0, 20, 10, 0.5);
            border: 1px solid rgba(0, 255, 65, 0.15);
            border-radius: 0;
            padding: 1rem;
            display: flex;
            align-items: center;
            gap: 0.75rem;
            transition: all 0.3s ease;
        }
        .service-item:hover {
            border-color: var(--primary-green);
            background: rgba(0, 255, 65, 0.05);
        }
        .service-item .service-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--primary-green);
            flex-shrink: 0;
        }
        .service-item .service-name {
            color: var(--primary-green);
            font-weight: 600;
            font-size: 0.85rem;
        }
        .service-item .service-purpose {
            color: var(--text-secondary);
            font-size: 0.75rem;
        }

        /* Lesson Cards */
        .lesson-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1.5rem;
            margin: 1.5rem 0;
        }
        .lesson-card {
            background: rgba(255, 68, 68, 0.03);
            border: 1px solid rgba(255, 153, 0, 0.2);
            border-radius: 0;
            padding: 1.5rem;
            transition: border-color 0.2s;
        }
        .lesson-card:hover {
            border-color: var(--warning-orange);
        }
        .lesson-card h3 {
            color: var(--warning-orange);
            font-size: 0.95rem;
            margin-bottom: 1rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .lesson-card ul {
            list-style: none;
            padding: 0;
        }
        .lesson-card li {
            color: var(--text-secondary);
            font-size: 0.8rem;
            line-height: 1.6;
            padding: 0.3rem 0;
            padding-left: 1.2rem;
            position: relative;
        }
        .lesson-card li::before {
            content: '\203A';
            position: absolute;
            left: 0;
            color: var(--warning-orange);
            font-weight: bold;
        }

        /* Topology layout */
        .homelab-topo-flex {
            display: flex;
            gap: 1rem;
            height: 700px;
            align-items: stretch;
        }
        .homelab-topology-container {
            position: relative;
            flex: 1;
            min-width: 0;
            height: 100%;
            background: rgba(0, 10, 5, 0.8);
            border: 1px solid var(--border-glow);
            border-radius: 0;
            overflow: hidden;
        }
        .homelab-topology-container canvas {
            width: 100%;
            height: 100%;
            display: block;
        }
        .homelab-topo-sidebar {
            width: 220px;
            flex-shrink: 0;
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        /* Controls sit in sidebar as normal block elements, not canvas overlays */
        .homelab-topo-sidebar .topology-controls,
        .homelab-topo-sidebar .topology-layer-controls {
            position: static;
        }
        .topology-layer-controls {
            background: rgba(0, 10, 5, 0.9);
            border: 1px solid var(--border-glow);
            border-radius: 0;
            padding: 0.75rem;
        }
        .topology-layer-controls h4 {
            color: var(--primary-green);
            font-size: 0.75rem;
            margin-bottom: 0.5rem;
            font-family: 'Orbitron', sans-serif;
        }
        .layer-toggle {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.3rem 0;
            font-size: 0.75rem;
            color: var(--text-secondary);
            cursor: pointer;
        }
        .layer-toggle input[type="checkbox"] {
            accent-color: var(--primary-green);
        }
        @media (max-width: 900px) {
            .homelab-topo-flex { flex-direction: column; height: auto; }
            .homelab-topology-container { height: 420px; }
            .homelab-topo-sidebar { width: 100%; flex-direction: row; flex-wrap: wrap; }
            .homelab-topo-sidebar .topology-controls,
            .homelab-topo-sidebar .topology-layer-controls { flex: 1; min-width: 200px; }
        }
        @media (max-width: 600px) {
            .hw-grid { grid-template-columns: 1fr; }
            .homelab-topology-container { height: 340px; }
        }