body {
    font-family: 'Noto Sans JP', sans-serif;
    padding: 2rem;
    background: #fefefe;
    line-height: 1.6;
    }

    h1 {
    color: #00205B;
    margin-bottom: 1em;
    }

    h2, h3 {
    color: #333;
    margin-top: 2em;
    }

    .toc {
    background: #f0f4f8;
    padding: 1em;
    margin-bottom: 2em;
    border-left: 4px solid #00205B;
    border-radius: 6px;
    }

    .toc h2 {
    font-size: 1.2em;
    margin-bottom: 0.5em;
    }

    .toc ul {
    padding-left: 1em;
    margin: 0;
    }

    .toc li {
    list-style-type: none;
    margin-bottom: 0.3em;
    }

    .toc a {
    color: #00205B;
    text-decoration: none;
    }

    .toc a:hover {
    text-decoration: underline;
    }

    img {
        max-width: 100%;
        height: auto;
        display: block;
        margin: 1em auto;
      }