/* ─── Article header ───────────────────────────────────── */
  .art__head { padding: 56px 0 48px; background: var(--paper-cool); border-bottom: 1px solid var(--line); }
  .art__head-inner { max-width: 880px; margin: 0 auto; }
  .art__crumbs { font-family: "JetBrains Mono", monospace; font-size: 11px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-muted); margin-bottom: 32px; }
  .art__crumbs span { margin: 0 12px; }
  .art__crumbs strong { color: var(--ink); font-weight: 500; }
  .art__meta-top {
    font-family: "JetBrains Mono", monospace;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--ink-muted);
    margin-bottom: 24px;
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
  }
  .art__cat { color: var(--ink-soft); }
  .art__sep { opacity: 0.5; }
  .art__title {
    font-size: 56px;
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.05;
    margin-bottom: 24px;
  }
  .art__excerpt {
    font-size: 19px;
    line-height: 1.55;
    color: var(--ink-soft);
    margin-bottom: 32px;
  }
  .art__byline {
    font-family: "JetBrains Mono", monospace;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--ink-muted);
    display: flex;
    gap: 6px;
  }
  .art__byline-by { opacity: 0.6; }
  .art__byline-name { color: var(--ink); font-weight: 500; }

  /* ─── Hero image ───────────────────────────────────────── */
  .art__hero { padding: 32px 0 64px; background: var(--paper-cool); }
  .art__hero-frame {
    border-radius: 5px;
    overflow: hidden;
    aspect-ratio: 16/9;
    max-width: 1080px;
    margin: 0 auto;
  }
  .art__hero-frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
  }

  /* ─── Body ─────────────────────────────────────────────── */
  .art__body { padding: 80px 0; }
  .art__body-grid {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 80px;
    max-width: 1200px;
    margin: 0 auto;
  }
  .art__side { position: sticky; top: 96px; align-self: start; display: flex; flex-direction: column; gap: 24px; }
  .art__side-block { padding-bottom: 16px; border-bottom: 1px solid var(--line); }
  .art__side-block:last-child { border-bottom: none; }
  .art__side-label { font-family: "JetBrains Mono", monospace; font-size: 10px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-muted); margin-bottom: 8px; }
  .art__side-value { font-size: 14px; font-weight: 600; }
  .art__side-sub { font-size: 12px; color: var(--ink-muted); margin-top: 2px; }
  .art__side-share { display: flex; flex-direction: column; gap: 8px; }
  .art__side-share a {
    font-family: "JetBrains Mono", monospace;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--ink);
    border-bottom: 1px solid var(--line);
    padding-bottom: 4px;
    width: fit-content;
  }
  .art__side-share a:hover { color: var(--ink-soft); border-bottom-color: var(--ink-soft); }

  .art__content { max-width: 720px; }
  .art__section { margin-bottom: 40px; }
  .art__h2 {
    font-size: 28px;
    font-weight: 700;
    letter-spacing: -0.01em;
    line-height: 1.2;
    margin-top: 48px;
    margin-bottom: 20px;
  }
  .art__p {
    font-size: 18px;
    line-height: 1.7;
    color: var(--ink-soft);
    margin-bottom: 24px;
  }
  /* In-content contextual links (SCN interlinking) */
  .art__p a {
    color: var(--ink);
    border-bottom: 1px solid var(--accent);
    text-decoration: none;
    transition: color 0.15s ease, border-color 0.15s ease;
  }
  .art__p a:hover { color: var(--accent); }
  .art__ruo {
    margin-top: 64px;
    padding: 24px 28px;
    background: var(--paper-cool);
    border-left: 3px solid var(--ink-soft);
    border-radius: 5px;
  }
  .art__ruo-label {
    font-family: "JetBrains Mono", monospace;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--ink-soft);
    margin-bottom: 10px;
  }
  .art__ruo p {
    font-size: 14px;
    line-height: 1.55;
    color: var(--ink-soft);
    margin: 0;
  }

  /* ─── Related ──────────────────────────────────────────── */
  .art__related { padding: 80px 0 120px; background: var(--paper-cool); border-top: 1px solid var(--line); }
  .art__related-title {
    font-size: 48px;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.05;
    text-transform: uppercase;
    margin-bottom: 56px;
  }

  @media (max-width: 1024px) {
    .art__title { font-size: 40px; }
    .art__body-grid { grid-template-columns: 1fr; gap: 32px; }
    .art__side { position: static; flex-direction: row; flex-wrap: wrap; gap: 24px 32px; }
    .art__side-block { border-bottom: none; padding-bottom: 0; }
    /* Sidebar reflows to a horizontal strip here — lay the share links in a row
       too (they're stacked vertically for the desktop rail). */
    .art__side-share { flex-direction: row; flex-wrap: wrap; gap: 22px; align-items: center; }
    .art__side-share a { width: auto; }
  }
  @media (max-width: 640px) {
    .art__title { font-size: 32px; }
    .art__excerpt { font-size: 16px; }
    .art__p { font-size: 16px; }
  }