body {
    font-family: "Microsoft YaHei", "Heiti SC", sans-serif;
    background-color: #f8fafc;
}
/* 针对 SVG 内的文本，使用更专业的数学字体 */
.svg-symbol {
    font-family: 'KaTeX_Math', 'Times New Roman', serif;
}
.slider-thumb::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #3b82f6;
    cursor: pointer;
    border: 2px solid white;
    box-shadow: 0 0 0 2px #3b82f6;
}
.slider-thumb::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #3b82f6;
    cursor: pointer;
    border: 2px solid white;
    box-shadow: 0 0 0 2px #3b82f6;
}
.canvas-grid line {
    stroke: #e2e8f0;
    stroke-width: 1;
}
.axis-text {
    font-size: 12px;
    fill: #64748b;
}
.disabled-input {
    opacity: 0.5;
    cursor: not-allowed;
}
.disabled-input input[type="range"] {
    pointer-events: none;
}