.hub-engineering {
            max-width: 900px;
            margin: 2rem auto;
            font-family: 'Segoe UI', system-ui, sans-serif;
            line-height: 1.7;
            color: #3a3a3a;
        }
        .mechanical-header {
            color: #2c3e50;
            border-left: 4px solid #e74c3c;
            padding-left: 1rem;
            margin: 2.5rem 0 1.5rem;
        }
        .kinetic-data {
            background: #f9f9f9;
            padding: 1.2rem;
            margin: 1.8rem 0;
            border-radius: 4px;
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        }
        .friction-coefficient {
            color: #27ae60;
            font-weight: 600;
            border-bottom: 2px dotted #27ae60;
        }
        .torque-diagram {
            color: #2980b9;
            font-weight: 500;
            margin: 1rem 0;
        }
        ul.mechanical-specs {
            list-style: none;
            padding-left: 1.5rem;
        }
        ul.mechanical-specs li {
            position: relative;
            margin-bottom: 0.8rem;
        }
        ul.mechanical-specs li:before {
            content: "▶";
            color: #e74c3c;
            position: absolute;
            left: -1.3rem;
            font-size: 0.9em;
        }
        .comparison-table {
            width: 100%;
            margin: 2rem 0;
            border-collapse: collapse;
        }
        .comparison-table td, .comparison-table th {
            padding: 0.8rem;
            border: 1px solid #ddd;
            text-align: left;
        }
        .comparison-table th {
            background: #e74c3c10;
        }