/* ============================================================
       column.html 専用スタイル
       base.css の変数・共通クラスを継承し、記事ページ固有の要素を定義
       ============================================================ */

    /* ===== PAGE LAYOUT ===== */
    .col-page-body {
      max-width: 1000px;
      margin: 0 auto;
      padding: 48px 20px 80px;
      display: grid;
      grid-template-columns: 1fr 280px;
      gap: 48px;
      align-items: start;
    }

    /* ===== BREADCRUMB ===== */
    .breadcrumb-bar {
      background: var(--teal-light);
      border-bottom: 1px solid var(--border);
    }
    .breadcrumb {
      max-width: 1000px;
      margin: 0 auto;
      padding: 10px 20px;
      font-size: 12px;
      color: var(--text-light);
      display: flex;
      gap: 6px;
      align-items: center;
      flex-wrap: wrap;
    }
    .breadcrumb a {
      color: var(--teal-dark);
      text-decoration: none;
      transition: opacity 0.2s;
    }
    .breadcrumb a:hover { opacity: 0.75; }
    .breadcrumb .sep { color: var(--border); }
    .breadcrumb .current { color: var(--text-light); }

    /* ===== ARTICLE HERO ===== */
    .article-hero {
      background: var(--navy);
      position: relative;
      overflow: hidden;
    }
    .article-hero::before {
      content: '';
      position: absolute;
      top: -120px; right: -120px;
      width: 500px; height: 500px;
      background: rgba(0,181,173,0.08);
      border-radius: 50%;
      pointer-events: none;
    }
    .article-hero::after {
      content: '';
      position: absolute;
      bottom: -80px; left: -80px;
      width: 300px; height: 300px;
      background: rgba(0,0,0,0.06);
      border-radius: 50%;
      pointer-events: none;
    }
    .article-hero-inner {
      max-width: 1000px;
      margin: 0 auto;
      padding: 52px 20px 48px;
      display: grid;
      grid-template-columns: 1fr 280px;
      gap: 48px;
      align-items: center;
      position: relative;
      z-index: 1;
    }
    .article-hero-meta {
      display: flex;
      gap: 8px;
      align-items: center;
      margin-bottom: 18px;
      flex-wrap: wrap;
    }
    .tag {
      font-size: 10px;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      padding: 4px 10px;
      border-radius: 3px;
      font-weight: 700;
    }
    .tag-column {
      background: var(--red);
      color: #fff;
    }
    .tag-number {
      background: transparent;
      color: var(--teal);
      border: 1px solid var(--teal);
    }
    .tag-category {
      background: rgba(255,255,255,0.12);
      color: rgba(255,255,255,0.75);
    }
    .article-hero-title {
      font-family: 'Noto Serif JP', serif;
      font-size: clamp(1.4rem, 3.2vw, 2.2rem);
      font-weight: 700;
      color: #fff;
      line-height: 1.3;
      letter-spacing: 0.02em;
      margin-bottom: 18px;
    }
    .article-hero-title .accent {
      color: var(--beige-dark);
    }
    .article-hero-desc {
      color: rgba(255,255,255,0.7);
      font-size: 14px;
      line-height: 1.9;
      max-width: 500px;
    }
    .article-hero-date {
      margin-top: 18px;
      font-size: 11px;
      color: rgba(255,255,255,0.4);
      letter-spacing: 0.1em;
    }
    /* ヒーロー右側：書籍カード */
    /* .hero-book-widget {
      background: rgba(255,255,255,0.07);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: 8px;
      padding: 24px 20px;
      text-align: center;
    }
    .hero-book-widget img {
      width: 110px;
      height: auto;
      border-radius: 3px;
      box-shadow: 5px 8px 20px rgba(0,0,0,0.45);
      margin-bottom: 14px;
    }
    .hero-book-widget .hw-title {
      font-family: 'Noto Serif JP', serif;
      font-size: 12px;
      color: #fff;
      line-height: 1.6;
      margin-bottom: 4px;
    }
    .hero-book-widget .hw-author {
      font-size: 11px;
      color: rgba(255,255,255,0.5);
      margin-bottom: 16px;
    }
    .hero-book-widget .hw-btn {
      display: block;
      background: #FF9900;
      color: #111;
      font-size: 12px;
      font-weight: 700;
      padding: 9px 14px;
      border-radius: 5px;
      text-decoration: none;
      transition: background 0.2s;
    }
    .hero-book-widget .hw-btn:hover { background: #e68900; } */

    /* ===== ARTICLE MAIN ===== */
    .article-content {
      background: #fff;
      border-radius: 6px;
      border: 1px solid var(--border);
      overflow: hidden;
      animation: fadeInUp 0.45s ease both;
    }
    @keyframes fadeInUp {
      from { opacity: 0; transform: translateY(14px); }
      to   { opacity: 1; transform: translateY(0); }
    }

    /* アイキャッチ */
    .eyecatch-wrap {
      width: 100%;
      aspect-ratio: 4 / 3;
      background: linear-gradient(135deg, var(--navy) 0%, #2a3a5c 100%);
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
    }
    .eyecatch-wrap::before {
      content: '';
      position: absolute;
      inset: 0;
      background: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 36px,
        rgba(0,181,173,0.05) 36px,
        rgba(0,181,173,0.05) 72px
      );
    }
    .eyecatch-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }
    .eyecatch-label {
      font-size: 12px;
      color: rgba(255,255,255,0.25);
      letter-spacing: 0.2em;
      text-transform: uppercase;
      z-index: 1;
    }

    .article-body {
      padding: 40px 44px 48px;
    }

    /* リード文 */
    .article-lead {
      font-family: 'Noto Serif JP', serif;
      font-size: 15px;
      line-height: 2.1;
      color: var(--text);
      border-left: 3px solid var(--teal);
      padding: 16px 20px;
      background: var(--teal-light);
      margin-bottom: 40px;
      border-radius: 0 4px 4px 0;
    }

    /* 見出し */
    .article-body h2 {
      font-family: 'Noto Serif JP', serif;
      font-size: 19px;
      font-weight: 700;
      color: var(--navy);
      margin: 48px 0 18px;
      padding-bottom: 10px;
      border-bottom: 2px solid var(--navy);
      position: relative;
      line-height: 1.3;
    }
    .article-body h2::after {
      content: '';
      position: absolute;
      bottom: -3px; left: 0;
      width: 56px; height: 3px;
      background: var(--red);
    }
    .article-body h3 {
      font-family: 'Noto Serif JP', serif;
      font-size: 16px;
      font-weight: 700;
      color: var(--navy);
      margin: 32px 0 14px;
      padding-left: 14px;
      border-left: 3px solid var(--teal);
      line-height: 1.3;
    }
    .article-body p {
      font-size: 15px;
      line-height: 1.8;
      color: var(--text-light);
      margin-bottom: 22px;
    }
    .article-body strong {
      color: var(--text);
      font-weight: 700;
    }

    /* 数字強調ブロック */
    .stat-block {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 14px;
      margin: 32px 0;
      padding: 28px 24px;
      background: var(--navy);
      border-radius: 6px;
      position: relative;
      overflow: hidden;
    }
    .stat-block::before {
      content: '';
      position: absolute;
      top: -40px; right: -40px;
      width: 200px; height: 200px;
      background: rgba(0,181,173,0.08);
      border-radius: 50%;
    }
    .stat-block .stat-item {
      text-align: center;
      position: relative;
      z-index: 1;
    }
    .stat-number {
      font-size: clamp(2rem, 5vw, 2.8rem);
      font-weight: 900;
      color: var(--red);
      line-height: 1;
      display: block;
    }
    .stat-unit {
      font-size: 1rem;
      color: var(--red);
    }
    .stat-label {
      font-size: 11px;
      color: rgba(255,255,255,0.65);
      margin-top: 8px;
      line-height: 1.6;
    }

    /* チェックリスト */
    .check-list {
      list-style: none;
      background: var(--teal-light);
      border-radius: 5px;
      padding: .5em 1em;
      margin: 2em 0;
    }
    .check-list li {
      font-size: 14px;
      color: var(--text);
      padding: 9px 0 9px 28px;
      position: relative;
      border-bottom: 1px solid var(--border);
      line-height: 1.7;
    }
    .check-list li:last-child { border-bottom: none; }
    .check-list li::before {
      content: '✓';
      position: absolute;
      left: 0;
      color: var(--teal-dark);
      font-weight: 700;
    }
    /* ナンバーリスト */
    .number-list {
      background-color: var(--teal-light);
      border-radius: 5px;
      padding: 0;
      margin: 2em 0;
    }
    .number-list li {
      font-size: 14px;
      color: var(--text);
      padding: 9px 0;
      margin-left: 2em;
      margin-right: 2em;
      position: relative;
      border-bottom: 1px solid var(--border);
      line-height: 1.5;
    }
    .number-list li:last-child { border-bottom: none; }



    /* 引用ブロック */
    .article-quote {
      margin: 36px 0;
      padding: 24px 28px 24px 36px;
      border: 1px solid var(--border);
      border-left: 4px solid var(--teal);
      background: #fffdf9;
      border-radius: 0 5px 5px 0;
      position: relative;
    }
    .article-quote::before {
      content: '❝';
      font-size: 2.8rem;
      font-family: Georgia, serif;
      color: var(--teal);
      opacity: 0.25;
      position: absolute;
      top: 6px; left: 12px;
      line-height: 1;
    }
    .article-quote p {
      font-family: 'Noto Serif JP', serif;
      font-size: 15px;
      line-height: 2.0;
      color: var(--text);
      margin: 0;
      padding-top: 6px;
    }
    .quote-source {
      font-size: 11px;
      color: var(--text-light);
      margin-top: 12px;
      text-align: right;
    }

    /* ポイントボックス */
    .point-box {
      background: linear-gradient(135deg, #fff5f0 0%, #fffbf5 100%);
      border: 1px solid rgba(232,64,64,0.2);
      border-radius: 5px;
      padding: 24px 28px;
      margin: 32px 0;
    }
    .point-box-title {
      font-size: 16px;
      letter-spacing: 0.1em;
      color: var(--red);
      font-weight: 700;
      margin-bottom: 12px;
    }
    .point-box p {
      font-size: 14px;
      color: var(--text-light);
      margin: 0;
      line-height: 1.9;
    }
    /*コンテンツ内画像*/
    .column_img{
      width: 100%;
      height: auto;
    }
    /*テーブル*/
    .column_table{
      border:1px solid #333;
      font-size: 14px;
      border-collapse: separate;
      width: fit-content;
      margin:2em auto;
    }
    .column_table td{
      padding:3px;
    }
    .column_table tr:nth-child(2n) td{
      background-color: var(--teal-light);
    }
    .column_table th{
      background-color:var(--teal-dark);
      color: #fff;
      font-weight: 700;
      letter-spacing: .3em;
    }


    /* ===== 著者バイオ ===== */
    .author-section {
      margin-top: 52px;
      padding-top: 36px;
      border-top: 1px solid var(--border);
    }
    .author-section-label {
      font-size: 10px;
      letter-spacing: 0.18em;
      text-transform: uppercase;
      color: var(--text-light);
      margin-bottom: 14px;
    }
    .author-card-row {
      display: flex;
      gap: 20px;
      align-items: flex-start;
      background: var(--teal-light);
      border-radius: 6px;
      padding: 22px 20px;
    }
    .author-card-photo {
      width: 76px;
      height: 76px;
      border-radius: 50%;
      object-fit: cover;
      flex-shrink: 0;
      border: 2px solid var(--teal);
      box-shadow: var(--teal) 2px 2px 0;
    }
    .author-card-name {
      font-size: 18px;
      font-weight: 700;
      color: var(--navy);
      margin-bottom: 1em;
    }
    .author-card-name-en {
      font-size: 11px;
      color: var(--text-light);
      letter-spacing: 0.1em;
      margin-bottom: 10px;
    }
    .author-section .author-card-bio {
      font-size: 13px;
      color: var(--text-light);
      line-height: 1.5;
      margin: 0;
      text-align: justify;
    }
   .book-card-photo {
      width: 130px;
      height: auto;
      object-fit: cover;
      flex-shrink: 0;
      box-shadow: var(--teal) 2px 2px 0;
    }
    /* ===== SHARE ===== */
    .share-section {
      margin-top: 36px;
      padding: 24px 28px;
      background: #fff;
      border: 1px solid var(--border);
      border-radius: 6px;
      text-align: center;
    }
    .share-label {
      font-size: 10px;
      letter-spacing: 0.18em;
      text-transform: uppercase;
      color: var(--text-light);
      margin-bottom: 14px;
    }
    .share-buttons {
      display: flex;
      gap: 10px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .share-btn {
      padding: 10px 20px;
      border-radius: 4px;
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 0.06em;
      cursor: pointer;
      border: none;
      transition: opacity 0.2s, transform 0.15s;
      display: flex;
      align-items: center;
      gap: 6px;
      font-family: 'Noto Sans JP', sans-serif;
    }
    .share-btn:hover { opacity: 0.82; transform: translateY(-1px); }
    .share-btn.twitter { background: #000; color: #fff; }
    .share-btn.line    { background: #06c755; color: #fff; }
    .share-btn.copy    { background: var(--teal-light); color: var(--teal-dark); border: 1px solid var(--border); }

    /* ===== PREV/NEXT NAV ===== */
    .article-nav {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 14px;
      margin-top: 36px;
    }
    .nav-card {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: 5px;
      padding: 18px 16px;
      transition: border-color 0.2s, transform 0.2s;
      text-decoration: none;
      display: block;
    }
    .nav-card:hover {
      border-color: var(--teal);
      transform: translateY(-2px);
    }
    .nav-direction {
      font-size: 10px;
      letter-spacing: 0.12em;
      color: var(--text-light);
      text-transform: uppercase;
      margin-bottom: 6px;
    }
    .nav-title {
      font-family: 'Noto Serif JP', serif;
      font-size: 13px;
      line-height: 1.6;
      color: var(--navy);
    }

    /* ===== SIDEBAR ===== */
    .col-sidebar {
      position: sticky;
      top: 80px;
      animation: fadeInUp 0.45s 0.12s ease both;
    }
    .sidebar-section {
      margin-bottom: 28px;
    }
    .sidebar-title {
      font-size: 10px;
      letter-spacing: 0.18em;
      text-transform: uppercase;
      color: var(--text-light);
      padding-bottom: 8px;
      border-bottom: 2px solid var(--teal);
      margin-bottom: 14px;
      font-weight: 700;
    }

    /* サイドバー：書籍カード */
    .sb-book-card {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: 6px;
      padding: 18px;
      text-align: center;
    }
    .sb-book-cover {
      width: 96px;
      height: auto;
      border-radius: 3px;
      box-shadow: 3px 5px 14px rgba(0,0,0,0.18);
      margin-bottom: 12px;
    }
    .sb-book-title {
      font-family: 'Noto Serif JP', serif;
      font-size: 12px;
      line-height: 1.6;
      margin-bottom: 5px;
      color: var(--navy);
    }
    .sb-book-author {
      font-size: 11px;
      color: var(--text-light);
      margin-bottom: 14px;
    }
    .sb-buy-btn {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      width: 100%;
      padding: 9px 12px;
      background: #FF9900;
      color: #111;
      font-size: 12px;
      font-weight: 700;
      border-radius: 5px;
      text-decoration: none;
      margin-bottom: 7px;
      transition: background 0.2s;
    }
    .sb-buy-btn:hover { background: #e68900; }
    .sb-buy-btn.secondary {
      background: var(--teal-light);
      color: var(--teal-dark);
      border: 1px solid var(--border);
    }
    .sb-buy-btn.secondary:hover { background: var(--border); }

    /* サイドバー：目次 */
    .toc {
      background: var(--teal-light);
      border-radius: 5px;
      padding: 16px 18px;
    }
    .toc-list { list-style: none; }
    .toc-item {
      font-size: 12px;
      padding: 7px 0;
      border-bottom: 1px dotted var(--border);
      color: var(--text-light);
      cursor: pointer;
      transition: color 0.2s;
      display: flex;
      gap: 8px;
      align-items: flex-start;
    }
    .toc-item:last-child { border-bottom: none; }
    .toc-item:hover { color: var(--teal-dark); }
    .toc-num {
      color: var(--teal-dark);
      font-weight: 700;
      flex-shrink: 0;
      font-size: 11px;
    }

    /* サイドバー：関連コラム */
    .related-list { list-style: none; }
    .related-item {
      border-bottom: 1px solid var(--border);
      padding: 12px 0;
    }
    .related-item:first-child { padding-top: 0; }
    .related-item a {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      text-decoration: none;
    }
    .related-num {
      font-family: 'Noto Serif JP', serif;
      font-size: 16px;
      color: var(--teal);
      font-weight: 700;
      flex-shrink: 0;
      line-height: 1.2;
      min-width: 22px;
    }
    .related-text {
      font-size: 12px;
      line-height: 1.65;
      color: var(--text-light);
      transition: color 0.2s;
    }
    .related-item a:hover .related-text { color: var(--teal-dark); }

    /* ===== BACK TO LIST ===== */
    .back-section {
      max-width: 1000px;
      margin: 0 auto 60px;
      padding: 0 20px;
      text-align: center;
    }
    .back-btn {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 13px 36px;
      border: 2px solid var(--teal-dark);
      font-size: 13px;
      font-weight: 700;
      letter-spacing: 0.08em;
      color: var(--teal-dark);
      border-radius: 4px;
      text-decoration: none;
      transition: background 0.2s, color 0.2s;
    }
    .back-btn:hover {
      background: var(--teal-dark);
      color: #fff;
    }

    /* ===== RESPONSIVE ===== */
    @media (max-width: 768px) {
      .article-hero-inner {
        grid-template-columns: 1fr;
        padding: 24px 16px 20px;
        gap: 24px;
      }
      .breadcrumb{
        display: none;
      }
      .hero-book-widget { display: none; }
      .col-page-body {
        grid-template-columns: 1fr;
        padding: 32px 16px 60px;
        gap: 36px;
      }
      .col-sidebar { position: static; }

      .article-body { padding: 28px 20px 36px; }

      .stat-block {
        grid-template-columns: 1fr;
        gap: 12px;
      }
      .article-nav {
        grid-template-columns: 1fr;
      }
      .author-card-row {
        flex-direction: column;
        align-items: center;
        text-align: center;
      }
    }
  </style>