/* ============================================================
   /blog/ 一覧・カテゴリ・個別記事
============================================================ */

.blog_wrap {
  max-width: var(--container_w);
  margin: 0 auto;
  padding: 32px 20px 48px;
}

/* ヒーロー */
.blog_hero {
  background: linear-gradient(135deg, var(--color_navy), var(--color_navy_mid));
  color: #fff;
  padding: clamp(2rem, 5vw, 3rem) 0;
}
.blog_hero_inner {
  max-width: var(--container_w);
  margin: 0 auto;
  padding: 0 20px;
}
.blog_hero_h1 {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  font-weight: 700;
}
.blog_hero_sub {
  font-size: clamp(0.875rem, 2vw, 1rem);
  margin-top: 8px;
  opacity: .95;
}

/* カテゴリタブ */
.blog_cat_tabs {
  display: flex;
  gap: 8px;
  padding: 0 0 20px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
}
.blog_cat_tabs::-webkit-scrollbar { display: none; }
.blog_cat_tab {
  flex-shrink: 0;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--color_border);
  background: #fff;
  font-size: 0.8125rem;
  color: var(--color_text);
  scroll-snap-align: start;
  transition: background .15s, color .15s, border-color .15s;
}
.blog_cat_tab:hover {
  border-color: var(--color_primary);
  color: var(--color_primary);
}
.blog_cat_tab.is_active {
  background: var(--color_navy);
  color: #fff;
  border-color: var(--color_navy);
}

/* ページネーション */
.blog_pagination {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-top: 24px;
  font-size: 0.875rem;
}
.blog_pagination a,
.blog_pagination span {
  padding: 8px 12px;
  border-radius: var(--radius_sm);
  color: var(--color_text_sub);
  background: var(--color_bg_sub);
}
.blog_pagination a:hover { color: var(--color_primary); }
.blog_pagination .is_active {
  background: var(--color_primary);
  color: #fff;
}

/* ------------------------------------------------------------
   個別記事
------------------------------------------------------------ */
.article {
  max-width: 760px;
  margin: 32px auto;
  padding: 0 20px;
}
.article_head { margin-bottom: 28px; }
.article_cat {
  display: inline-block;
  background: var(--color_primary_light);
  color: var(--color_primary_dark);
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}
.article_title {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  color: var(--color_navy);
  line-height: 1.5;
  margin-top: 12px;
}
.article_meta {
  display: flex;
  gap: 16px;
  font-size: 0.8125rem;
  color: var(--color_text_sub);
  margin-top: 12px;
}
.article_thumb {
  margin-top: 20px;
  border-radius: var(--radius_lg);
  overflow: hidden;
  aspect-ratio: 16 / 9;
}
.article_thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.article_thumb_fallback {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--color_primary_light), var(--color_primary));
}
.article_lead {
  margin-top: 24px;
  padding: 16px 20px;
  background: var(--color_primary_light);
  border-left: 4px solid var(--color_primary);
  border-radius: 0 var(--radius_md) var(--radius_md) 0;
}
.article_lead strong {
  display: block;
  font-size: 0.875rem;
  color: var(--color_primary_dark);
  margin-bottom: 8px;
}
.article_lead ul { padding: 0; }
.article_lead li {
  font-size: 0.875rem;
  line-height: 1.7;
  padding-left: 18px;
  position: relative;
  margin-bottom: 4px;
}
.article_lead li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color_primary);
  font-weight: 700;
}

/* 目次 */
.article_toc {
  background: var(--color_bg_sub);
  border: 1px solid var(--color_border);
  border-radius: var(--radius_md);
  padding: 16px 20px;
  margin: 32px 0;
}
.article_toc_h {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color_text_sub);
  margin-bottom: 12px;
}
.article_toc ol {
  list-style: decimal inside;
  font-size: 0.875rem;
  line-height: 2;
  padding: 0;
}
.article_toc a { color: var(--color_text); }
.article_toc a:hover { color: var(--color_primary); }

/* 本文 */
.article_body {
  font-size: clamp(0.9375rem, 1.6vw, 1rem);
  line-height: 1.9;
  color: var(--color_text);
}
.article_body h2 {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  font-weight: 700;
  color: var(--color_navy);
  margin: 48px 0 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color_primary);
}
.article_body h3 {
  font-size: clamp(1.125rem, 2vw, 1.25rem);
  font-weight: 700;
  color: var(--color_navy);
  margin: 32px 0 12px;
  padding-left: 12px;
  border-left: 4px solid var(--color_primary);
}
.article_body p { margin-bottom: 1.5em; }
.article_body a {
  color: var(--color_primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.article_body ul,
.article_body ol {
  margin: 1em 0 1.5em 1.5em;
}
.article_body li { margin-bottom: .5em; }
.article_body img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius_md);
  margin: 1.5em 0;
}
.article_body blockquote {
  border-left: 4px solid var(--color_border_strong);
  padding: 12px 16px;
  margin: 1.5em 0;
  background: var(--color_bg_sub);
  font-size: 0.9375rem;
  color: var(--color_text_sub);
}
.article_body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 0.875rem;
}
.article_body th,
.article_body td {
  padding: 10px 12px;
  border: 1px solid var(--color_border);
  text-align: left;
}
.article_body th {
  background: var(--color_bg_sub);
  font-weight: 600;
}

/* 記事中盤CTA */
.article_cta_inline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px;
  background: linear-gradient(135deg, var(--color_primary_light), #fff);
  border: 1px solid var(--color_primary);
  border-radius: var(--radius_lg);
  margin: 40px 0;
}
.article_cta_inline strong {
  display: block;
  font-size: 0.9375rem;
  color: var(--color_navy);
}
.article_cta_inline span {
  display: block;
  font-size: 0.8125rem;
  color: var(--color_text_sub);
  margin-top: 4px;
}
.article_cta_inline_btn {
  background: var(--color_line);
  color: #fff;
  padding: 12px 20px;
  border-radius: var(--radius_md);
  font-weight: 700;
  white-space: nowrap;
  flex-shrink: 0;
}

/* まとめ */
.article_summary {
  background: var(--color_bg_sub);
  border-radius: var(--radius_lg);
  padding: 24px;
  margin-top: 48px;
}
.article_summary_h {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color_navy);
  margin-bottom: 16px;
}
.article_summary_list dt {
  font-weight: 700;
  color: var(--color_primary_dark);
  font-size: 0.9375rem;
  margin-top: 16px;
}
.article_summary_list dt:first-child { margin-top: 0; }
.article_summary_list dd {
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--color_text);
  margin-top: 6px;
}

/* レスポンシブ */
@media (max-width: 639px) {
  .article_cta_inline {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
  }
  .article_cta_inline_btn { width: 100%; text-align: center; }
}

/* ============================================================
   ブログ一覧カードグリッド（最大4カラム）
============================================================ */
.blog_grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.blog_card {
  background: #fff;
  border: 1px solid var(--color_border);
  border-radius: var(--radius_lg);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform .15s, box-shadow .2s, border-color .15s;
  display: flex;
  flex-direction: column;
}
.blog_card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0,0,0,.08);
  border-color: var(--color_primary);
}
.blog_card_thumb {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: linear-gradient(135deg, #cbd5e0, #94a3b8);
}
.blog_card_thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .3s;
}
.blog_card:hover .blog_card_thumb img { transform: scale(1.05); }
.blog_card_thumb_icon {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 3rem; opacity: .6;
}
.blog_card_cat {
  position: absolute;
  top: 10px; left: 10px;
  background: rgba(26,44,78,.92);
  color: #fff;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: .02em;
}
.blog_card_ai_badge {
  position: absolute;
  top: 10px; right: 10px;
  background: rgba(30,153,134,.95);
  color: #fff;
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
}
.blog_card_body {
  padding: 14px 16px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.blog_card_title {
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.55;
  color: var(--color_navy);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.blog_card_excerpt {
  font-size: 0.78rem;
  color: var(--color_text_sub);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.blog_card_meta {
  display: flex; gap: 10px;
  font-size: 0.7rem;
  color: var(--color_text_sub);
  margin-top: auto;
  padding-top: 6px;
  border-top: 1px solid var(--color_border);
}

/* 最大4カラム制限（大画面） */
@media (min-width: 1100px) {
  .blog_grid { grid-template-columns: repeat(4, 1fr); }
}

/* ============================================================
   記事詳細：リーダブル設計
============================================================ */
.blog_article_wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}
.blog_article_eyecatch {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius_lg);
  margin-bottom: 24px;
  background: linear-gradient(135deg, #cbd5e0, #94a3b8);
}
.blog_article_header {
  margin-bottom: 28px;
}
.blog_article_meta_row {
  display: flex; gap: 10px; flex-wrap: wrap;
  font-size: 0.78rem;
  color: var(--color_text_sub);
  margin-bottom: 10px;
}
.blog_article_cat_pill {
  background: var(--color_navy);
  color: #fff;
  padding: 3px 10px;
  border-radius: 999px;
  font-weight: 700;
}
.blog_article_title {
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 800;
  line-height: 1.5;
  color: var(--color_navy);
  margin-bottom: 12px;
}
.blog_article_excerpt {
  font-size: 1rem;
  color: var(--color_text);
  line-height: 1.9;
  padding: 16px 20px;
  background: var(--color_bg_sub);
  border-left: 4px solid var(--color_primary);
  border-radius: var(--radius_md);
  margin-bottom: 28px;
}
.blog_article_body {
  font-size: 1rem;
  line-height: 1.95;
  color: var(--color_text);
}
.blog_article_body h2 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color_navy);
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 3px solid var(--color_primary);
}
.blog_article_body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color_navy);
  margin: 28px 0 10px;
  padding-left: 12px;
  border-left: 4px solid var(--color_primary);
}
.blog_article_body p { margin: 0 0 16px; }
.blog_article_body ul,
.blog_article_body ol { margin: 0 0 20px; padding-left: 24px; }
.blog_article_body li { margin-bottom: 8px; }
.blog_article_body a {
  color: var(--color_primary);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.blog_article_body strong { color: var(--color_navy); }
.blog_article_body table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 0.95rem; }
.blog_article_body th, .blog_article_body td { padding: 8px 12px; border: 1px solid var(--color_border); }
.blog_article_body th { background: var(--color_bg_sub); }
.blog_article_tags {
  margin: 28px 0; display: flex; flex-wrap: wrap; gap: 6px;
}
.blog_article_tag {
  background: #eef5ff;
  color: #1e3a5f;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
}