/* =========================================================
   技術コラム個別ページ (single-column.php)
   テーマ標準CSSに未定義のセクション（記事ヘッダー/前後ナビ/関連コラム）を補う。
   すべて .single-column-page スコープで他ページに影響させない。
   ========================================================= */

/* --- 1カラム化（右サイドバー撤去・本文は読みやすい幅で中央寄せ） --- */
.single-column-page .content-layout { display: block; }
.single-column-page .content-article { max-width: 900px; margin: 0 auto; }
.single-column-page .content-article:hover { transform: none; }

/* --- 記事ヘッダー（カテゴリー＋日付） --- */
.single-column-page .news-header { padding: 24px 0 0; }
.single-column-page .news-header-content {
    display: flex; flex-wrap: wrap; align-items: center; gap: 16px;
}
.single-column-page .news-categories { display: flex; gap: 8px; }
.single-column-page .news-category-tag {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 4px 14px; background: var(--color-primary, #4A8DD1); color: #fff;
    border-radius: 999px; font-size: .8rem; text-decoration: none;
}
.single-column-page .news-category-tag:hover { opacity: .9; }
.single-column-page .news-meta {
    display: flex; gap: 18px; color: var(--color-neutral-500, #64748b); font-size: .85rem;
}
.single-column-page .news-meta i { margin-right: 6px; }

/* --- 前後ナビ --- */
.single-column-page .news-navigation {
    padding: 40px 0; margin-top: 48px; border-top: 1px solid var(--color-neutral-200, #e2e8f0);
}
.single-column-page .nav-links {
    display: flex; align-items: stretch; justify-content: space-between; gap: 16px; flex-wrap: wrap;
}
.single-column-page .nav-previous,
.single-column-page .nav-next { flex: 1 1 0; min-width: 220px; }
.single-column-page .nav-next { text-align: right; }
.single-column-page .nav-center { display: flex; align-items: center; }
.single-column-page .nav-link {
    display: inline-block; width: 100%; text-decoration: none;
    color: var(--color-neutral-800, #1e293b);
    border: 1px solid var(--color-neutral-200, #e2e8f0); border-radius: 10px; padding: 14px 18px;
    transition: border-color .2s ease, box-shadow .2s ease;
}
.single-column-page .nav-link:hover {
    border-color: var(--color-primary, #4A8DD1); box-shadow: 0 8px 20px rgba(26, 74, 117, .08);
}
.single-column-page .nav-label { font-size: .78rem; color: var(--color-neutral-500, #64748b); margin-bottom: 6px; }
.single-column-page .nav-title { font-weight: 700; font-size: .95rem; line-height: 1.5; }
.single-column-page .nav-date { font-size: .78rem; color: var(--color-neutral-500, #64748b); margin-top: 6px; }
.single-column-page .list-link {
    background: var(--color-primary, #4A8DD1); color: #fff; border: none; white-space: nowrap;
    display: inline-flex; align-items: center; gap: 8px;
}
.single-column-page .list-link:hover { color: #fff; opacity: .92; }

/* --- 関連コラム --- */
.single-column-page .related-news { padding: 56px 0; background: #f7f8fa; }
.single-column-page .related-news-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin-top: 36px;
}
.single-column-page .related-news-item {
    background: #fff; border: 1px solid var(--color-neutral-200, #e2e8f0); border-radius: 10px;
    overflow: hidden; transition: transform .25s ease, box-shadow .25s ease;
}
.single-column-page .related-news-item:hover {
    transform: translateY(-4px); box-shadow: 0 14px 30px rgba(26, 74, 117, .12);
}
.single-column-page .related-thumbnail a { display: block; aspect-ratio: 16 / 9; overflow: hidden; }
.single-column-page .related-thumbnail img { width: 100%; height: 100%; object-fit: cover; display: block; }
.single-column-page .related-thumbnail .no-image {
    display: flex; align-items: center; justify-content: center; aspect-ratio: 16 / 9;
    background: #eef2f7; color: #94a3b8; font-size: 2rem;
}
.single-column-page .related-content { padding: 16px 18px 20px; display: flex; flex-direction: column; gap: 10px; }
.single-column-page .related-category .category-tag {
    display: inline-block; padding: 3px 12px; background: var(--color-primary, #4A8DD1); color: #fff;
    font-size: .72rem; border-radius: 999px;
}
.single-column-page .related-title { margin: 0; font-size: 1rem; line-height: 1.6; }
.single-column-page .related-title a {
    color: var(--color-neutral-800, #1e293b); font-weight: 700; text-decoration: none;
    display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.single-column-page .related-title a:hover { color: var(--color-primary, #4A8DD1); }
.single-column-page .related-date { color: var(--color-neutral-500, #64748b); font-size: .82rem; }
.single-column-page .related-date i { margin-right: 6px; }

@media (max-width: 992px) {
    .single-column-page .related-news-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
    .single-column-page .related-news-grid { grid-template-columns: 1fr; }
    .single-column-page .nav-next { text-align: left; }
}