main { display: block; }

  /* ============================================================
     Breadcrumb (reusable across article-style pages)
     ============================================================ */
  .article-crumb {
    padding: 18px max(40px, 8.3vw);
    border-bottom: 1px solid var(--color-border);
    background: #fff;
  }
  .article-crumb__list {
    max-width: 1180px; margin: 0 auto;
    display: flex; flex-wrap: wrap; gap: 10px;
    list-style: none; padding: 0;
    font-family: var(--font-en); font-size: 11px;
    letter-spacing: 0.14em; color: var(--color-text-mute);
  }
  .article-crumb__item { display: inline-flex; align-items: center; gap: 10px; }
  .article-crumb__item:not(:last-child)::after { content: "/"; opacity: 0.4; margin-left: 10px; }
  .article-crumb__item a { color: var(--color-text-mute); text-decoration: none; transition: color var(--transition); }
  .article-crumb__item a:hover { color: var(--color-accent); }
  .article-crumb__item--current { color: var(--color-text); font-family: var(--font-jp); font-weight: 700; }

  /* ============================================================
     Article Header (meta / title / featured image)
     ============================================================ */
  .article-header {
    padding: 56px max(40px, 8.3vw) 32px;
    background: var(--color-bg-alt);
  }
  .article-header__inner { max-width: 980px; margin: 0 auto; }
  .article-header__meta {
    display: flex; align-items: center; gap: 14px;
    margin-bottom: 22px;
  }
  .article-header__category {
    display: inline-flex; align-items: center;
    font-family: var(--font-jp); font-weight: 800;
    font-size: 12px; letter-spacing: 0.04em;
    padding: 6px 14px; border-radius: var(--radius-pill);
    background: var(--color-accent); color: #fff;
  }
  .article-header__date {
    font-family: var(--font-en); font-weight: 700;
    font-size: 12.5px; letter-spacing: 0.14em;
    color: var(--color-text-sub);
  }
  .article-header__title {
    font-family: var(--font-jp); font-weight: 900;
    font-size: clamp(26px, 3.4vw, 40px); line-height: 1.45;
    color: var(--color-text); margin: 0;
    letter-spacing: 0.02em;
  }

  /* Featured image */
  .article-featured {
    padding: 0 max(40px, 8.3vw);
    margin-top: -1px;
    background: var(--color-bg-alt);
  }
  .article-featured__inner {
    max-width: 980px; margin: 0 auto;
    padding-bottom: 56px;
  }
  .article-featured__img {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    border-radius: 18px;
    background:
      linear-gradient(135deg, var(--color-paper) 0%, var(--color-bg-alt) 100%);
    display: block;
    border: 1px solid var(--color-border);
  }

  /* ============================================================
     Article body — TOC + content (2-col on desktop, stacked on mobile)
     ============================================================ */
  .article-body {
    padding: 64px max(40px, 8.3vw) 96px;
  }
  .article-body__grid {
    max-width: 1180px; margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 280px);
    gap: 64px;
    align-items: start;
  }

  /* Table of contents — right sidebar, sticky */
  .article-toc {
    position: sticky; top: calc(var(--header-h) + 24px);
    padding: 26px 28px;
    background: #fff; border: 1px solid var(--color-border);
    border-radius: 16px;
  }
  .article-toc__title {
    font-family: var(--font-en); font-weight: 800;
    font-size: 11px; letter-spacing: 0.18em;
    color: var(--color-accent);
    padding-bottom: 14px; margin-bottom: 14px;
    border-bottom: 1px solid var(--color-border);
    display: flex; align-items: center; gap: 8px;
  }
  .article-toc__title::before {
    content: ""; width: 18px; height: 1px;
    background: var(--color-accent);
  }
  .article-toc__list {
    list-style: none; padding: 0; margin: 0;
    display: flex; flex-direction: column; gap: 8px;
  }
  .article-toc__list li {
    font-family: var(--font-jp); font-weight: 700;
    font-size: 13px; line-height: 1.55;
  }
  .article-toc__list a {
    color: var(--color-text); text-decoration: none;
    display: block; padding: 6px 0 6px 16px;
    border-left: 2px solid transparent;
    transition: border-color var(--transition), color var(--transition), padding-left var(--transition);
  }
  .article-toc__list a:hover {
    border-left-color: var(--color-accent);
    color: var(--color-accent);
    padding-left: 18px;
  }
  /* H3-level (sub) toc items — indented */
  .article-toc__list li.is-sub a {
    font-weight: 500; font-size: 12.5px;
    padding-left: 32px; color: var(--color-text-sub);
  }
  .article-toc__list li.is-sub a:hover { padding-left: 34px; }

  /* ============================================================
     Article content (rich text — same look as WP editor output)
     ============================================================ */
  .article-content {
    font-family: var(--font-jp);
    color: var(--color-text);
    font-size: 15.5px;
    line-height: 1.95;
    word-break: break-all;
    overflow-wrap: anywhere;
  }
  .article-content > * + * { margin-top: 24px; }
  .article-content h2 {
    font-family: var(--font-jp); font-weight: 900;
    font-size: clamp(22px, 2.4vw, 28px); line-height: 1.5;
    color: var(--color-text); letter-spacing: 0.02em;
    margin-top: 56px; padding: 0 0 14px;
    border-bottom: 2px solid var(--color-text);
    position: relative;
  }
  .article-content h2::before {
    content: ""; position: absolute;
    left: 0; bottom: -2px; width: 80px; height: 2px;
    background: var(--color-accent);
  }
  .article-content h3 {
    font-family: var(--font-jp); font-weight: 900;
    font-size: clamp(18px, 2vw, 22px); line-height: 1.55;
    color: var(--color-text); margin-top: 40px;
    padding-left: 14px; border-left: 4px solid var(--color-accent);
  }
  .article-content h4 {
    font-family: var(--font-jp); font-weight: 900;
    font-size: 17px; line-height: 1.55;
    color: var(--color-text); margin-top: 32px;
  }
  .article-content p { margin: 0; }
  .article-content a {
    color: var(--color-accent); font-weight: 700;
    text-decoration: underline; text-decoration-thickness: 1px;
    text-underline-offset: 3px;
  }
  .article-content a:hover { color: var(--color-accent-dark); }
  .article-content strong, .article-content b { font-weight: 900; }
  .article-content em { font-style: normal; color: var(--color-accent); font-weight: 700; }

  .article-content ul, .article-content ol {
    padding-left: 1.6em; margin: 0;
  }
  .article-content ul li, .article-content ol li {
    margin: 8px 0; line-height: 1.85;
  }
  .article-content ul li::marker { color: var(--color-accent); }

  .article-content blockquote {
    margin: 0; padding: 22px 26px;
    background: var(--color-bg-alt);
    border-left: 4px solid var(--color-accent);
    border-radius: 0 12px 12px 0;
    font-style: normal; font-size: 14.5px; line-height: 1.95;
    color: var(--color-text);
  }
  .article-content blockquote cite {
    display: block; margin-top: 10px;
    font-family: var(--font-en); font-weight: 700;
    font-size: 11.5px; letter-spacing: 0.12em;
    color: var(--color-text-sub); font-style: normal;
  }

  .article-content img, .article-content figure img {
    max-width: 100%; height: auto;
    border-radius: 12px; display: block;
    border: 1px solid var(--color-border);
  }
  .article-content figure { margin: 0; }
  .article-content figure figcaption {
    margin-top: 10px;
    font-family: var(--font-jp); font-size: 12px;
    color: var(--color-text-sub);
  }

  .article-content hr {
    border: 0; height: 1px;
    background: var(--color-border);
    margin: 40px 0;
  }

  .article-content table {
    width: 100%; border-collapse: collapse;
    font-size: 13.5px;
  }
  .article-content th, .article-content td {
    border: 1px solid var(--color-border);
    padding: 12px 14px; text-align: left;
    vertical-align: top;
  }
  .article-content th {
    background: var(--color-bg-alt);
    font-weight: 800;
  }

  .article-content code {
    background: var(--color-bg-alt);
    font-family: var(--font-mono);
    font-size: 0.92em;
    padding: 2px 6px; border-radius: 4px;
  }
  .article-content pre {
    background: var(--color-bg-dark);
    color: #fff;
    padding: 22px 24px;
    border-radius: 12px;
    overflow-x: auto;
    font-family: var(--font-mono); font-size: 13px; line-height: 1.7;
  }

  /* Article foot — back to list */
  .article-foot {
    max-width: 1180px; margin: 0 auto;
    padding-top: 48px;
    border-top: 1px solid var(--color-border);
    display: flex; justify-content: center;
  }
  .article-foot__back {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 12px 26px; border-radius: var(--radius-pill);
    background: var(--color-text); color: #fff;
    font-family: var(--font-jp); font-weight: 800;
    font-size: 13px; text-decoration: none;
    transition: all var(--transition);
  }
  .article-foot__back:hover { background: var(--color-accent); transform: translateY(-2px); }
  .article-foot__back span { font-family: var(--font-en); font-size: 12px; }

  /* Tighten footer-area */
  .footer-area { margin-top: 0; }

  /* Responsive */
  @media (max-width: 1024px) {
    .article-header { padding: 40px 24px 24px; }
    .article-featured { padding: 0 24px; }
    .article-featured__inner { padding-bottom: 40px; }
    .article-body { padding: 48px 24px 72px; }
    .article-body__grid { grid-template-columns: 1fr; gap: 32px; }
    .article-toc { position: relative; top: 0; order: -1; }
  }

/* Knowledge 資料DLボックス */
.kn-dl-box { margin-top: 48px; padding: 32px 32px 36px; background: var(--color-bg-alt); border: 1px solid var(--color-border); border-radius: 18px; }
.kn-dl-box__title { font-family: var(--font-jp); font-weight: 900; font-size: 18px; color: var(--color-text); margin: 0 0 8px; }
.kn-dl-box__lead { font-family: var(--font-jp); font-weight: 500; font-size: 13px; line-height: 1.8; color: var(--color-text-sub); margin: 0 0 22px; padding-bottom: 18px; border-bottom: 1px solid var(--color-border); }
.kn-dl-success p { font-family: var(--font-jp); font-size: 14px; line-height: 1.85; color: var(--color-text); margin: 0 0 18px; }
.kn-dl-link { display: inline-flex; align-items: center; gap: 8px; padding: 15px 32px; background: var(--color-accent); color: #fff; border-radius: var(--radius-pill); font-family: var(--font-jp); font-weight: 800; font-size: 15px; text-decoration: none; transition: all var(--transition); }
.kn-dl-link:hover { background: var(--color-accent-dark); transform: translateY(-2px); }