/* ============================================
       ARTICLE DETAIL PAGE
       ============================================ */

    /* ---- Breadcrumb ---- */
    .breadcrumb {
      padding: 14px 0;
      border-bottom: 1px solid var(--border);
    }
    .breadcrumb__list {
      display: flex;
      align-items: center;
      gap: 8px;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 var(--pad-pc);
    }
    .breadcrumb__item {
      font-size: 11px;
      letter-spacing: .08em;
      color: var(--text-muted);
    }
    .breadcrumb__item a { color: var(--text-muted); }
    .breadcrumb__item a:hover { color: var(--text); }
    .breadcrumb__sep { color: var(--border); font-size: 11px; }

    /* ---- Affiliate Notice ---- */
    .affiliate-notice {
      border-bottom: 1px solid var(--border);
    }
    .affiliate-notice__text {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 10px var(--pad-pc);
      font-size: 11px;
      letter-spacing: .06em;
      color: var(--text-muted);
      text-align: center;
    }

    /* ---- Article Layout ---- */
    .article-layout {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 var(--pad-pc);
      display: grid;
      grid-template-columns: 1fr 280px;
      gap: 0;
      align-items: start;
      overflow-x: hidden;
    }

    /* ---- Article Main ---- */
    .article-main {
      border-right: 1px solid var(--border);
      padding: 48px 48px 64px 0;
      min-width: 0;
    }

    /* Article Header */
    .article-header {
      border-bottom: 1px solid var(--border);
      padding-bottom: 32px;
      margin-bottom: 40px;
    }
    .article-header__category {
      font-size: 11px;
      letter-spacing: .28em;
      color: var(--text-muted);
      margin-bottom: 16px;
    }
    .article-header__title {
      font-family: var(--font-serif);
      font-size: 41px;
      font-weight: 400;
      line-height: 1.45;
      letter-spacing: .04em;
      margin-bottom: 16px;
      text-wrap: balance;
    }
    .article-header__subtitle {
      font-size: 17px;
      font-weight: 400;
      line-height: 1.8;
      color: var(--text-sub);
      margin-bottom: 24px;
      letter-spacing: .04em;
    }
    .article-header__meta {
      display: flex;
      align-items: center;
      gap: 20px;
      font-size: 13px;
      color: var(--text-muted);
      letter-spacing: .06em;
    }
    .article-header__meta-item {
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .article-header__tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 20px;
    }
    .tag {
      display: inline-block;
      font-size: 11px;
      letter-spacing: .1em;
      color: var(--accent-dark);
      border: 1px solid var(--accent-light);
      background: var(--accent-light);
      padding: 4px 12px;
      border-radius: 20px;
      transition: border-color .2s, background .2s, color .2s;
    }
    .tag:hover { border-color: var(--accent); background: var(--bg); }

    /* Hero Image */
    .article-hero-img {
      width: 100%;
      aspect-ratio: 16/9;
      background: var(--placeholder);
      margin-bottom: 12px;
    }
    .article-img-caption {
      font-size: 11px;
      color: var(--text-muted);
      letter-spacing: .06em;
      margin-bottom: 36px;
      text-align: right;
    }

    /* Article Body */
    .article-body {
      font-family: var(--font-body);
      font-size: 17px;
      font-weight: 400;
      line-height: 2.05;
      letter-spacing: .06em;
      color: var(--text);
      overflow-wrap: break-word;
      word-break: break-word;
      max-width: 100%;
    }
    .article-body p {
      margin-bottom: 1.8em;
    }
    .article-body h2 {
      font-family: var(--font-serif);
      font-size: 25px;
      font-weight: 400;
      letter-spacing: .06em;
      line-height: 1.5;
      border-left: 3px solid var(--border);
      border-top: none;
      padding: 0 0 0 16px;
      margin: 48px 0 20px;
      color: var(--text);
    }
    .article-body h3 {
      font-family: var(--font-sans);
      font-size: 16px;
      font-weight: 500;
      letter-spacing: .08em;
      margin: 32px 0 12px;
      color: var(--text);
    }
    .article-body blockquote {
      border-left: 2px solid var(--border);
      background: none;
      border-radius: 0;
      padding: 4px 0 4px 24px;
      margin: 28px 0;
      color: var(--text-sub);
    }
    .article-body .article-img {
      width: 100%;
      aspect-ratio: 4/3;
      background: var(--placeholder2);
      margin: 32px 0 10px;
    }
    .article-body .article-img-caption {
      text-align: left;
      margin-bottom: 32px;
    }

    /* Article Footer */
    .article-footer {
      border-top: 1px solid var(--border);
      margin-top: 48px;
      padding-top: 32px;
    }
    .article-footer__share {
      display: flex;
      align-items: center;
      flex-wrap: nowrap;
      gap: 8px;
      margin-bottom: 24px;
      overflow-x: auto;
      scrollbar-width: none;
    }
    .article-footer__share::-webkit-scrollbar { display: none; }
    .article-footer__share-label {
      font-size: 11px;
      letter-spacing: .18em;
      color: var(--text-muted);
      flex-shrink: 0;
    }
    .share-btn {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 11px;
      letter-spacing: .1em;
      border: 1px solid var(--border);
      border-radius: var(--radius-pill);
      padding: 6px 14px;
      color: var(--text-sub);
      transition: border-color .2s, color .2s, background .2s;
      cursor: pointer;
      white-space: nowrap;
      flex-shrink: 0;
    }
    .share-btn:hover { border-color: var(--accent-warm); background: var(--accent-warm-light); color: var(--accent-warm); }
    .article-footer__tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    /* ---- Sidebar ---- */
    .sidebar {
      padding: 40px 0 64px 36px;
      min-width: 0;
    }
    .sidebar__section {
      margin-bottom: 48px;
    }
    .sidebar__heading {
      font-size: 12px;
      font-weight: 700;
      letter-spacing: .22em;
      color: var(--accent-warm);
      margin-bottom: 14px;
    }

    /* Popular Articles */
    .popular-list { display: flex; flex-direction: column; gap: 10px; }
    .popular-item {
      display: flex;
      gap: 12px;
      align-items: center;
      background: #fff;
      border-radius: 10px;
      padding: 10px 12px;
      box-shadow: 0 1px 6px rgba(0,0,0,.07);
      transition: box-shadow .2s, transform .2s;
      text-decoration: none;
    }
    .popular-item:hover { box-shadow: 0 4px 14px rgba(0,0,0,.11); transform: translateY(-1px); }
    .popular-item__num {
      font-family: var(--font-serif);
      font-size: 16px;
      color: var(--accent-warm);
      flex-shrink: 0;
      width: 12px;
      font-weight: 700;
    }
    .popular-item__img {
      width: 64px;
      height: 48px;
      border-radius: 6px;
      flex-shrink: 0;
      background: var(--placeholder);
      overflow: hidden;
    }
    .popular-item__img img { width: 100%; height: 100%; object-fit: cover; display: block; }
    .popular-item__title {
      font-size: 12px;
      line-height: 1.65;
      letter-spacing: .03em;
      color: var(--text);
    }

    /* Category List */
    .sidebar-cat-list { display: flex; flex-wrap: wrap; gap: 8px; }
    .sidebar-cat-item {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 7px 14px;
      background: #fff;
      border: 1px solid var(--border);
      border-radius: 20px;
      font-size: 13px;
      letter-spacing: .04em;
      color: var(--text);
      transition: background .2s, border-color .2s, color .2s;
    }
    .sidebar-cat-item:hover { background: var(--accent-warm); border-color: var(--accent-warm); color: #fff; }
    .sidebar-cat-item:hover .sidebar-cat-item__count { color: rgba(255,255,255,.75); }
    .sidebar-cat-item__count {
      font-size: 11px;
      color: var(--text-weakest);
    }

    /* ============================================
       RESPONSIVE — ARTICLE PAGE (breakpoint: 900px)
       ============================================ */
    @media (max-width: 900px) {
      .article-layout {
        grid-template-columns: 1fr;
        padding: 0 var(--pad-pc);
      }
      .article-main {
        border-right: none;
        padding: 40px 0 48px;
      }
      .sidebar {
        padding: 0 0 40px;
        border-top: 1px solid var(--border);
      }
      .sidebar__section:first-child { margin-top: 28px; }
    }

    /* ============================================
       RESPONSIVE — ARTICLE PAGE (breakpoint: 768px)
       ============================================ */
    @media (max-width: 768px) {

      /* Breadcrumb */
      .breadcrumb__list { padding: 0 var(--pad-sp); flex-wrap: nowrap; overflow: hidden; }
      .breadcrumb__item { white-space: nowrap; flex-shrink: 1; min-width: 0; }
      .breadcrumb__item:last-child { overflow: hidden; text-overflow: ellipsis; }
      .breadcrumb__sep { flex-shrink: 0; }

      .affiliate-notice__text { padding: 10px var(--pad-sp); }

      /* Layout: padding を SP用に変更（1col化は900px側で済み） */
      .article-layout { padding: 0 var(--pad-sp); }
      .article-main { padding: 28px 0 40px; }

      /* Article header */
      .article-header__title { font-size: 25px; line-height: 1.5; }
      .article-header__subtitle { font-size: 15px; }
      .article-header__meta { flex-wrap: wrap; gap: 8px; }

      /* Article body */
      .article-body { font-size: 16px; }
      .article-body h2 { font-size: 19px; }

      /* Sidebar: below article, no left padding */
      .sidebar {
        padding: 0 0 40px;
        border-top: 1px solid var(--border);
      }
      .sidebar__section { margin-bottom: 32px; }
      .sidebar__section:first-child { margin-top: 32px; }
    }

/* ============================================
   POST NAV (prev/next)
   ============================================ */
.post-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin: 40px 0 32px;
}
.post-nav__item {
    display: block;
    padding: 16px 20px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    color: var(--text);
    text-decoration: none;
    transition: border-color .2s, box-shadow .2s;
    min-height: 64px;
}
.post-nav__item:hover {
    border-color: var(--text-sub);
    box-shadow: var(--shadow-card);
}
.post-nav__item--next { text-align: right; }
.post-nav__item--disabled { background: transparent; border-color: transparent; pointer-events: none; }
.post-nav__label {
    display: block;
    font-size: 10px;
    letter-spacing: .2em;
    color: var(--text-muted);
    margin-bottom: 6px;
}
.post-nav__title {
    display: block;
    font-family: var(--font-serif);
    font-size: 14px;
    line-height: 1.5;
    color: var(--text);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
@media (max-width: 768px) {
    .post-nav { grid-template-columns: 1fr; gap: 8px; }
}

/* ============================================
   RELATED POSTS
   ============================================ */
.related-posts { margin: 48px 0 24px; }
.related-posts__heading {
    font-family: var(--font-serif);
    font-size: 22px;
    font-weight: 400;
    letter-spacing: .04em;
    margin-bottom: 20px;
}
.related-posts__heading span {
    font-size: 12px;
    letter-spacing: .2em;
    color: var(--text-muted);
    margin-left: 8px;
}
.related-posts__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}
@media (max-width: 768px) {
    .related-posts__grid { grid-template-columns: 1fr; }
}