/* ==========================================================================
   column-article.css — 個別コラム記事ページ共通スタイル
   ========================================================================== */

/* ▼ 記事ヒーロー */
.page-hero--article {
  background:
    linear-gradient(135deg, rgba(27,42,74,0.88) 0%, rgba(27,42,74,0.65) 100%),
    linear-gradient(120deg, #3a4d7a 0%, #1b2a4a 60%, #131e38 100%);
  color: #fff;
  padding: 60px 0 70px;
}
.page-hero--article .article-meta {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.page-hero--article .article-meta-cat {
  display: inline-block;
  padding: 5px 14px;
  font-size: 12px;
  font-weight: 600;
  background: var(--gold, #c5a55a);
  color: #fff;
  border-radius: 3px;
  letter-spacing: 0.08em;
}
.page-hero--article .article-meta-date {
  font-size: 13px;
  color: #cfd5e3;
  font-family: "Helvetica Neue", Arial, sans-serif;
  letter-spacing: 0.04em;
}
.page-hero--article h1 {
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.5;
  font-weight: 700;
  margin: 0 0 18px;
  color: #fff;
}
.page-hero--article .article-lead {
  font-size: 15px;
  line-height: 1.9;
  color: #e4e8f0;
  max-width: 820px;
  margin: 0;
}

/* ▼ 本文レイアウト */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 60px;
  padding: 70px 0 90px;
  align-items: start;
}
.article-main {
  min-width: 0;
}
.article-aside {
  position: sticky;
  top: 100px;
}

/* ▼ ヒーローサムネイル */
.article-hero-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: 6px;
  margin: 0 0 40px;
  box-shadow: 0 6px 24px rgba(27,42,74,0.12);
}
.article-hero-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ▼ 本文タイポグラフィ */
.article-body {
  font-size: 15.5px;
  line-height: 1.95;
  color: #2b3146;
}
.article-body h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--navy, #1b2a4a);
  margin: 52px 0 20px;
  padding: 0 0 12px 16px;
  border-left: 5px solid var(--gold, #c5a55a);
  border-bottom: 1px solid #e5e7eb;
  line-height: 1.5;
}
.article-body h2:first-child {
  margin-top: 0;
}
.article-body h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--navy, #1b2a4a);
  margin: 36px 0 14px;
  padding-left: 14px;
  border-left: 3px solid var(--gold, #c5a55a);
  line-height: 1.5;
}
.article-body p {
  margin: 0 0 20px;
}
.article-body ul,
.article-body ol {
  margin: 0 0 24px;
  padding-left: 1.4em;
}
.article-body li {
  margin-bottom: 8px;
}
.article-body strong {
  color: var(--navy, #1b2a4a);
  background: linear-gradient(transparent 70%, #fcf0c9 70%);
  font-weight: 700;
  padding: 0 2px;
}
.article-body a {
  color: var(--gold, #c5a55a);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.article-body a:hover {
  color: var(--navy, #1b2a4a);
}

/* ▼ 本文内ボックス */
.article-callout {
  background: #fcf7eb;
  border: 1px solid #e9d8a7;
  border-left: 5px solid var(--gold, #c5a55a);
  border-radius: 4px;
  padding: 20px 24px;
  margin: 28px 0;
}
.article-callout-title {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--gold, #c5a55a);
  margin-bottom: 8px;
  letter-spacing: 0.08em;
}
.article-callout p:last-child { margin-bottom: 0; }
.article-callout .callout-note {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed #e0c98a;
  font-size: 12px;
  line-height: 1.75;
  color: #7a6230;
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0 32px;
  font-size: 14.5px;
}
.article-table th,
.article-table td {
  border: 1px solid #e5e7eb;
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
}
.article-table th {
  background: #f5f7fb;
  color: var(--navy, #1b2a4a);
  font-weight: 700;
  white-space: nowrap;
}

/* ▼ 参考・引用元 */
.article-citations {
  margin: 48px 0 10px;
  padding: 22px 26px;
  background: #f5f7fb;
  border-left: 4px solid var(--navy, #1b2a4a);
  border-radius: 4px;
}
.article-citations h3 {
  font-size: 15px;
  color: var(--navy, #1b2a4a);
  margin: 0 0 14px;
  border: none;
  padding: 0;
  letter-spacing: 0.04em;
}
.article-citations ul {
  margin: 0 0 14px;
  padding-left: 1.2em;
}
.article-citations li {
  font-size: 13px;
  line-height: 1.75;
  margin-bottom: 10px;
}
.article-citations .citation-url {
  display: block;
  font-size: 11.5px;
  font-family: "Helvetica Neue", Arial, sans-serif;
  color: #6b7280;
  word-break: break-all;
  margin-top: 2px;
  letter-spacing: 0.01em;
}
.article-citations a {
  color: var(--navy, #1b2a4a);
  text-decoration: underline;
  text-underline-offset: 2px;
  word-break: break-all;
}
.article-citations a:hover {
  color: var(--gold, #c5a55a);
}
.article-citations .citations-note {
  font-size: 12px;
  color: #6b7280;
  margin: 0;
  line-height: 1.75;
}

/* ▼ 記事末 CTA */
.article-end-cta {
  margin: 50px 0 20px;
  padding: 32px 30px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #f9fafb;
  text-align: center;
}
.article-end-cta h3 {
  font-size: 18px;
  color: var(--navy, #1b2a4a);
  margin: 0 0 10px;
  border: none;
  padding: 0;
}
.article-end-cta p {
  font-size: 14px;
  color: #4b5563;
  margin: 0 0 18px;
}
.article-end-cta .btn {
  display: inline-block;
  padding: 12px 30px;
  background: var(--gold, #c5a55a);
  color: #fff;
  border-radius: 4px;
  font-weight: 700;
  text-decoration: none;
  transition: background 0.2s ease;
}
.article-end-cta .btn:hover {
  background: #b38c3e;
}

/* ▼ 前後記事ナビ */
.article-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 50px 0 0;
  padding: 30px 0 0;
  border-top: 1px solid #e5e7eb;
}
.article-nav a {
  display: flex;
  flex-direction: column;
  padding: 18px;
  border: 1px solid #e5e7eb;
  border-radius: 6px;
  text-decoration: none;
  color: var(--navy, #1b2a4a);
  transition: all 0.2s ease;
  background: #fff;
}
.article-nav a:hover {
  border-color: var(--gold, #c5a55a);
  box-shadow: 0 4px 10px rgba(27,42,74,0.08);
}
.article-nav a span {
  font-size: 11px;
  color: #9ca3af;
  font-weight: 600;
  letter-spacing: 0.1em;
  margin-bottom: 6px;
}
.article-nav a.next {
  text-align: right;
  align-items: flex-end;
}
.article-nav a strong {
  font-size: 14px;
  line-height: 1.5;
  font-weight: 700;
}

/* ▼ サイドバー（関連記事） */
.article-aside h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--navy, #1b2a4a);
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--gold, #c5a55a);
  letter-spacing: 0.04em;
}
.related-articles {
  list-style: none;
  padding: 0;
  margin: 0 0 32px;
}
.related-articles li {
  margin-bottom: 18px;
}
.related-articles a {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 12px;
  text-decoration: none;
  color: var(--navy, #1b2a4a);
  transition: opacity 0.2s;
}
.related-articles a:hover {
  opacity: 0.7;
}
.related-articles img {
  width: 90px;
  height: 65px;
  object-fit: cover;
  border-radius: 4px;
  display: block;
}
.related-articles .rel-body {
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.related-articles .rel-cat {
  font-size: 10px;
  color: var(--gold, #c5a55a);
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-bottom: 3px;
}
.related-articles .rel-title {
  font-size: 13px;
  line-height: 1.5;
  font-weight: 600;
}

.back-to-list {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  font-size: 13px;
  font-weight: 600;
  color: var(--navy, #1b2a4a);
  border: 1px solid #d1d5db;
  border-radius: 999px;
  text-decoration: none;
  transition: all 0.2s;
}
.back-to-list:hover {
  background: var(--navy, #1b2a4a);
  color: #fff;
  border-color: var(--navy, #1b2a4a);
}

/* ▼ レスポンシブ */
@media (max-width: 960px) {
  .article-layout {
    grid-template-columns: 1fr;
    gap: 50px;
  }
  .article-aside {
    position: static;
  }
}
@media (max-width: 640px) {
  .article-layout {
    padding: 50px 0 70px;
  }
  .article-body h2 { font-size: 19px; }
  .article-body h3 { font-size: 16px; }
  .article-nav { grid-template-columns: 1fr; }
}