#table-of-contents {
    background: #f8f8f8;
    border: 1px solid #ddd;
    border-radius: 5px;
    padding: 20px;
    margin: 20px 0;
    max-width: 100%;
}


.toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc-list li {
    margin: 8px 0;
    line-height: 1.4;
}

.toc-link {
    color: #333;
    text-decoration: none;
    display: block;
    padding: 5px 0;
}

.toc-link:hover {
    color: #0066cc;
}

/* ヘッダーレベルに応じたインデント */
.toc-level-1 {
    font-weight: bold;
    font-size: 1.1em;
}

.toc-level-2 {
    padding-left: 20px;
    font-weight: 600;
}

.toc-level-3 {
    padding-left: 40px;
}

.toc-level-4 {
    padding-left: 60px;
    font-size: 0.95em;
}

.toc-level-5 {
    padding-left: 80px;
    font-size: 0.9em;
}

.toc-level-6 {
    padding-left: 100px;
    font-size: 0.85em;
}

/* ダークモード対応 */
body.dark #table-of-contents {
    background: #2d2d2d;
    border-color: #444;
}


body.dark .toc-link {
    color: #ccc;
}

body.dark .toc-link:hover {
    color: #66b3ff;
}

/* ページトップに戻るボタン */
#scroll-to-top {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    background-color: #333;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 18px;
    z-index: 1000;
}

#scroll-to-top:hover {
    background-color: #555;
}

/* ダークモード対応 */
body.dark #scroll-to-top {
    background-color: #666;
    color: #fff;
}

body.dark #scroll-to-top:hover {
    background-color: #888;
}