.input-group-custom {
            margin-bottom: 1rem;
        }
        .unit-note {
            font-size: 0.9rem;
            color: #6c757d;
        }
        .dilution-canvas {
            width: 100%;
            background: #f5f7fb;
            border-radius: 12px;
            margin-top: 1rem;
            border: 1px solid #e0e4e8;
        }
        .canvas-container {
            text-align: center;
            margin-top: 1rem;
        }
        .legend {
            display: flex;
            justify-content: center;
            gap: 2rem;
            margin: 0.5rem 0;
            font-size: 0.9rem;
        }
        .legend-item {
            display: flex;
            align-items: center;
            gap: 0.3rem;
        }
        .legend-color {
            width: 16px;
            height: 16px;
            border-radius: 2px;
        }
        .legend-color.initial { background-color: #1f6392; }
        .legend-color.final { background-color: #6bb5d9; }
        .inline-code {
            background: #f0f0f0;
            padding: 0.2rem 0.4rem;
            border-radius: 6px;
            font-family: monospace;
        }
        .unit-select-sm {
            width: auto;
            display: inline-block;
            margin-left: 8px;
        }
        .dilution-card {
            background: white;
            border-radius: 16px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
            padding: 1.25rem;
        }