.blog-masthead {
        text-align: center;
        padding-top: clamp(54px, 8vw, 92px);
        padding-bottom: clamp(34px, 5vw, 56px);
        overflow: hidden;
      }
      .blog-masthead::before {
        content: "";
        position: absolute;
        inset: 0;
        background-image: radial-gradient(var(--a8) 1px, transparent 1px);
        background-size: 22px 22px;
        mask-image: radial-gradient(ellipse 72% 58% at 48% 20%, #000 25%, transparent 72%);
        -webkit-mask-image: radial-gradient(ellipse 72% 58% at 48% 20%, #000 25%, transparent 72%);
        pointer-events: none;
      }
      .blog-masthead > * { position: relative; z-index: 1; }
      .blog-masthead .h-display {
        max-width: 820px;
        margin: 0 auto 20px;
        font-size: clamp(2.05rem, 4.4vw, 3.55rem);
        line-height: 1.07;
        letter-spacing: -0.034em;
      }
      .blog-masthead .lede {
        margin: 0 auto;
        max-width: 720px;
      }
      .article-meta {
        display: flex;
        justify-content: center;
        flex-wrap: wrap;
        gap: 8px;
        margin: 28px 0 0;
      }
      .article-meta span {
        font-family: var(--mono);
        font-size: 0.66rem;
        letter-spacing: 0.1em;
        text-transform: uppercase;
        color: var(--muted);
        border: 1px solid var(--a10);
        background: rgba(255, 255, 255, 0.72);
        border-radius: 100px;
        padding: 7px 10px;
      }
      .author-row {
        display: inline-flex;
        align-items: center;
        gap: 12px;
        margin-top: 24px;
        color: var(--muted);
        font-size: 0.92rem;
      }
      .author-mark {
        width: 34px;
        height: 34px;
        border-radius: 10px;
        border: 1px solid var(--a10);
        background: var(--bg-card);
        padding: 5px;
      }
      .article-cover {
        padding-top: 0;
        padding-bottom: clamp(42px, 6vw, 72px);
      }
      .article-cover-card {
        border: 1px solid var(--a10);
        border-radius: 22px;
        background:
          radial-gradient(ellipse 80% 70% at 100% 0%, rgba(37, 99, 235, 0.14), transparent 62%),
          radial-gradient(ellipse 70% 70% at 0% 100%, rgba(255, 100, 47, 0.11), transparent 62%),
          var(--bg-card);
        overflow: hidden;
        box-shadow: 0 1px 2px rgba(18, 20, 40, 0.05), 0 26px 70px -42px rgba(18, 20, 40, 0.38);
      }
      .article-cover-card img {
        width: 100%;
        aspect-ratio: 1.92;
        object-fit: cover;
      }
      .article-cover-caption {
        font-family: var(--mono);
        font-size: 0.68rem;
        letter-spacing: 0.08em;
        text-transform: uppercase;
        color: var(--faint);
        padding: 12px 16px 14px;
        border-top: 1px solid var(--a8);
        background: rgba(255, 255, 255, 0.72);
      }
      .blog-shell {
        display: grid;
        grid-template-columns: 210px minmax(0, 720px) 220px;
        gap: clamp(24px, 4vw, 44px);
        align-items: start;
      }
      .article-body {
        max-width: 720px;
        margin: 0 auto;
      }
      .article-body > p,
      .article-body li {
        font-size: clamp(1.02rem, 1.35vw, 1.16rem);
        line-height: 1.82;
        color: var(--ink-soft);
      }
      .article-body > p {
        margin: 0 0 22px;
      }
      .article-body h2 {
        font-size: clamp(1.55rem, 3vw, 2.3rem);
        font-weight: 600;
        letter-spacing: -0.03em;
        line-height: 1.1;
        margin: 54px 0 16px;
      }
      .article-body h3 {
        font-size: 1.08rem;
        font-weight: 600;
        letter-spacing: -0.015em;
        margin-bottom: 8px;
      }
      .answer-box {
        border: 1px solid var(--a10);
        border-radius: var(--r-lg);
        background:
          linear-gradient(120deg, var(--geo-soft), transparent 46%),
          var(--bg-card);
        padding: clamp(22px, 3vw, 30px);
        margin: 28px 0;
      }
      .answer-box .label,
      .faq-item .label {
        font-family: var(--mono);
        font-size: 0.62rem;
        font-weight: 500;
        letter-spacing: 0.14em;
        text-transform: uppercase;
        color: var(--faint);
        display: block;
        margin-bottom: 10px;
      }
      .answer-box p {
        color: var(--ink-soft);
        line-height: 1.75;
        margin: 0;
      }
      .article-callout {
        border: 1px solid var(--a10);
        border-radius: var(--r-lg);
        background:
          linear-gradient(120deg, var(--heat-8), transparent 42%),
          var(--bg-card);
        padding: clamp(24px, 4vw, 36px);
        margin: clamp(32px, 5vw, 52px) 0;
      }
      .article-callout p {
        color: var(--ink-soft);
        line-height: 1.7;
        margin-top: 10px;
      }
      .blog-side {
        position: sticky;
        top: 92px;
      }
      .blog-side-card {
        border: 1px solid var(--a10);
        border-radius: var(--r-lg);
        background: var(--bg-card);
        padding: 16px;
        margin-bottom: 14px;
      }
      .blog-side-card .label {
        font-family: var(--mono);
        font-size: 0.62rem;
        font-weight: 500;
        letter-spacing: 0.14em;
        text-transform: uppercase;
        color: var(--faint);
        display: block;
        margin-bottom: 12px;
      }
      .stack-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 1px;
        border: 1px solid var(--a8);
        border-radius: var(--r-lg);
        background: var(--a8);
        overflow: hidden;
        margin: 34px 0;
      }
      .stack-card {
        background: var(--bg-card);
        padding: clamp(22px, 3vw, 32px);
      }
      .stack-card img {
        width: 100%;
        aspect-ratio: 1.45;
        object-fit: cover;
        border: 1px solid var(--a8);
        border-radius: 14px;
        margin-bottom: 18px;
        background: var(--bg-lighter);
      }
      .stack-card .num {
        display: inline-block;
        font-family: var(--mono);
        font-size: 0.64rem;
        font-weight: 500;
        letter-spacing: 0.14em;
        text-transform: uppercase;
        color: var(--heat-strong);
        margin-bottom: 14px;
      }
      .stack-card p {
        color: var(--muted);
        font-size: 0.92rem;
        line-height: 1.65;
      }
      .article-toc {
        display: grid;
        gap: 10px;
      }
      .article-toc a {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 14px;
        text-decoration: none;
        color: var(--ink-soft);
        font-weight: 550;
        border-radius: 10px;
        padding: 8px 10px;
        font-size: 0.9rem;
      }
      .article-toc a:hover { background: var(--a4); color: var(--ink); }
      .article-toc a::after { content: "->"; font-family: var(--mono); color: var(--heat-strong); }
      .share-list {
        display: grid;
        gap: 8px;
      }
      .share-list a {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        text-decoration: none;
        font-size: 0.88rem;
        color: var(--ink-soft);
        padding: 8px 10px;
        border-radius: 10px;
      }
      .share-list a:hover { background: var(--a4); color: var(--ink); }
      .related-mini {
        display: grid;
        gap: 12px;
      }
      .related-mini a {
        display: block;
        text-decoration: none;
        color: var(--ink);
        border-radius: 12px;
      }
      .related-mini img {
        width: 100%;
        aspect-ratio: 1.45;
        object-fit: cover;
        border: 1px solid var(--a8);
        border-radius: 12px;
        margin-bottom: 10px;
      }
      .related-mini strong {
        display: block;
        font-size: 0.92rem;
        line-height: 1.35;
        letter-spacing: -0.015em;
      }
      .article-split {
        display: grid;
        grid-template-columns: minmax(0, 1fr) minmax(260px, 0.76fr);
        gap: clamp(26px, 5vw, 54px);
        align-items: start;
        margin-top: 46px;
      }
      .article-split .offer-visual {
        position: sticky;
        top: 88px;
      }
      .article-cta {
        text-align: center;
        border: 1px solid var(--a10);
        border-radius: 24px;
        padding: clamp(34px, 6vw, 56px);
        background:
          radial-gradient(ellipse 80% 80% at 85% 0%, rgba(37, 99, 235, 0.16), transparent 62%),
          radial-gradient(ellipse 70% 70% at 10% 100%, rgba(255, 100, 47, 0.14), transparent 62%),
          var(--bg-card);
      }
      .article-cta .row {
        justify-content: center;
        margin-top: 24px;
      }
      .faq-grid {
        display: grid;
        gap: 14px;
        max-width: 920px;
        margin: 36px auto 0;
      }
      .faq-item {
        border: 1px solid var(--a10);
        border-radius: var(--r-lg);
        background: var(--bg-card);
        padding: clamp(22px, 3vw, 30px);
      }
      .faq-item h3 {
        font-size: clamp(1.05rem, 1.4vw, 1.22rem);
        font-weight: 600;
        letter-spacing: -0.018em;
        line-height: 1.25;
        margin-bottom: 10px;
      }
      .faq-item p {
        color: var(--muted);
        line-height: 1.72;
        font-size: 0.98rem;
      }
      @media (max-width: 880px) {
        .blog-shell,
        .article-split {
          grid-template-columns: 1fr;
        }
        .blog-side { position: relative; top: auto; }
        .blog-side.is-left { order: -1; }
        .blog-side.is-right { display: none; }
        .article-split .offer-visual { position: relative; top: auto; }
        .stack-grid { grid-template-columns: 1fr; }
        .article-cover-card img { aspect-ratio: 1.35; }
      }
      @media (max-width: 560px) {
        .blog-masthead { padding-top: 44px; }
        .article-meta span { width: 100%; text-align: center; }
        .article-cta .row { flex-direction: column; }
        .article-cta .btn { width: 100%; }
      }
    
/* ===== legacy article content blocks (converted articles) ===== */
.article-body .nutrition-share-grid,
.article-body [class*="-grid"] {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 14px;
  margin: 18px 0;
}
.article-body .nutrition-share-grid article,
.article-body [class*="-grid"] article {
  border: 1px solid var(--a10);
  border-radius: 14px;
  background: var(--bg-card);
  padding: 18px;
}
.article-body [class*="-grid"] article h3 { font-size: 0.98rem; margin-bottom: 6px; }
.article-body [class*="-grid"] article p { font-size: 0.86rem; color: var(--muted); margin: 0; }
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 0.9rem;
}
.article-body th, .article-body td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--a8);
  vertical-align: top;
}
.article-body thead th {
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.article-body img { max-width: 100%; border-radius: 12px; }
.article-body ul, .article-body ol { padding-left: 22px; margin: 14px 0; }
.article-body li { margin: 6px 0; color: var(--ink-soft); }
.article-body .nutrition-share-proof,
.article-body [class*="-proof"] {
  border: 1px solid var(--a10);
  border-radius: 14px;
  background: var(--bg-lighter);
  padding: 18px 20px;
  margin: 18px 0;
}

.article-toc a { align-items: center; }
.article-toc a::after { flex-shrink: 0; white-space: nowrap; }