body {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    color: #1a1a1a;
    max-width: 900px;
    margin: 2rem auto;
    padding: 0 1rem;
    line-height: 1.4;
}

h3 {
    margin-bottom: 0.5rem;
}

canvas {
    border: 1px solid #ccc;
    touch-action: none;
}

input[type="button"] {
    padding: 6px 14px;
    margin: 6px 6px 6px 0;
    font-size: 14px;
    cursor: pointer;
}

table {
    border-collapse: collapse;
    margin-top: 0.5rem;
}

td, th {
    padding: 4px 6px;
    vertical-align: top;
}

img {
    image-rendering: pixelated;
}

figcaption {
    font-size: 12px;
    text-align: center;
    color: #555;
}