/* 共通ヘッダー・ナビゲーション */
.site-header { padding-top: 0; padding-bottom: 20px; }
.site-header__bar { padding-top: 20px; display: flex; align-items: center; justify-content: space-between; position: relative; gap: 1rem; }
.site-header__logo img { display: block; max-width: 100%; height: auto; }
.site-nav ul { display: flex; flex-wrap: wrap; gap: 0.25rem 1.5rem; list-style: none; margin: 0; padding: 0; }
.site-nav a { color: #595757; text-decoration: none; display: block; padding: 0.25rem 0; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: #8a9a2b; }
.site-header__toggle { display: none; background: none; border: 0; padding: 0.5rem; width: 44px; height: 44px; cursor: pointer; flex-direction: column; justify-content: center; gap: 6px; }
.site-header__toggle span { display: block; height: 2px; background: #595757; }
@media (max-width: 991.98px) {
  .site-header__toggle { display: flex; }
  .site-nav { display: none; position: absolute; top: 100%; left: 0; right: 0; background: #fff; z-index: 50; box-shadow: 0 6px 12px rgba(0,0,0,.12); padding: 0.5rem 1rem; }
  .site-nav.is-open { display: block; }
  .site-nav ul { flex-direction: column; gap: 0; }
  .site-nav li a { padding: 0.9rem 0.25rem; border-bottom: 1px solid #ddd; text-align: center; }
}

/* お知らせ（投稿）ページ */
.post-head { padding-top: 3rem; }
.post-title { font-size: 2rem; line-height: 1.5; margin-bottom: 0.5rem; }
.post-meta { color: #777; margin-bottom: 2rem; }
@media (max-width: 575.98px) { .post-title { font-size: 1.5rem; } }