/* セクション番号付け用のカスタムCSS */

/* 記事本文のカウンターをリセット */
.content {
    counter-reset: h2-counter;
}

/* h2 見出しに番号を追加 */
.content h2 {
    counter-increment: h2-counter;
    counter-reset: h3-counter;
}

.content h2::before {
    content: counter(h2-counter) ". ";
    margin-right: 0.5em;
}

/* h3 見出しに番号を追加 */
.content h3 {
    counter-increment: h3-counter;
    counter-reset: h4-counter;
}

.content h3::before {
    content: counter(h2-counter) "." counter(h3-counter) ". ";
    margin-right: 0.5em;
}

/* h4 見出しに番号を追加 */
.content h4 {
    counter-increment: h4-counter;
}

.content h4::before {
    content: counter(h2-counter) "." counter(h3-counter) "." counter(h4-counter) ". ";
    margin-right: 0.5em;
}