.unit-note {
            font-size: 0.9rem;
            color: #6c757d;
        }
        .weight-display {
            text-align: center;
            padding: 1.5rem;
            background: linear-gradient(145deg, #f8f9fa, #e9ecef);
            border-radius: 12px;
            margin: 1rem 0;
        }
        .weight-display .weight-number {
            font-size: 3.5rem;
            font-weight: 700;
            color: #0d6efd;
        }
        .weight-display .weight-unit {
            font-size: 1.5rem;
            color: #6c757d;
        }
        .density-ref {
            font-size: 0.9rem;
            background: #f8f9fa;
            padding: 0.8rem;
            border-radius: 6px;
            margin-top: 0.5rem;
        }
        .legend-color {
            display: inline-block;
            width: 16px;
            height: 16px;
            border-radius: 4px;
            margin-right: 4px;
        }
        .legend-color.steel { background: #6c757d; }
        .legend-color.dim { background: #0d6efd; }
        .legend-color.weight { background: #dc3545; }
        .canvas-container {
            text-align: center;
            margin-top: 1rem;
        }
        .geometry-canvas {
            width: 100%;
            height: auto;
            background-color: #f9f9f9;
            border: 1px solid #ddd;
            border-radius: 8px;
            display: block;
            margin: 0 auto;
        }
        .legend {
            display: flex;
            justify-content: center;
            gap: 2rem;
            margin: 0.5rem 0;
            font-size: 0.9rem;
            flex-wrap: wrap;
        }
        .legend-item {
            display: flex;
            align-items: center;
            gap: 0.3rem;
        }
        .input-group-custom {
            margin-bottom: 1rem;
        }
        .coord-input {
            margin-bottom: 0.5rem;
        }