.axis-label {
            font-size: 14px;
            font-weight: bold;
        }
        .dot {
            stroke: #000;
        }
        .tooltip {
            position: absolute;
            padding: 8px;
            background: rgba(0, 0, 0, 0.8);
            color: white;
            border-radius: 4px;
            pointer-events: none;
            font-size: 12px;
        }
        .fit-line {
            stroke: #ff7f0e;
            stroke-width: 2;
            fill: none;
        }
        .fit-area {
            fill: #ff7f0e;
            opacity: 0.2;
        }