.tooltip_ac {
    position: absolute;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 4px 6px;
    border-radius: 4px;
    pointer-events: none;
    font-size: 12px;
    opacity: 0;
}

.axis-label {
    font-size: 16px;
    fill: #333;
}

.grid line {
    stroke: #e6e6e6;
    stroke-width: 1;
    shape-rendering: crispEdges;
}

.legend {
    font-size: 16px;
    text-align: center;
    margin-bottom: 10px;
}

.legend-item {
    display: inline-block;
    margin: 0 10px;
}

.legend-swatch {
    width: 12px;
    height: 2px;
    display: inline-block;
    vertical-align: middle;
    margin-right: 6px;
}