/* Editorial surfaces only. Shared commerce, navigation and skins are unchanged. */
.materials-document { scroll-behavior: auto; }
.material-teaser { margin-block: 14px 64px; padding: clamp(22px, 3.5vw, 42px); display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 32px; border: 1px solid var(--line); border-radius: 16px; background: var(--mist); }
.material-teaser > * { min-width: 0; }
.material-kicker { margin: 0 0 12px; color: var(--teal-dark); font-size: 11px; font-weight: 800; letter-spacing: .14em; }
.material-teaser h2 { margin: 0; font-size: clamp(23px, 3vw, 35px); line-height: 1.5; letter-spacing: -.03em; }
.material-teaser-copy > p:not(.material-kicker) { margin: 16px 0; max-width: 42em; color: var(--ink-soft); font-size: 14px; }
.material-link { min-height: 44px; display: inline-flex; align-items: center; gap: 20px; color: var(--teal-dark); font-weight: 700; text-decoration: none; }
.material-link:hover { color: var(--ink); }
.material-link:focus-visible, .material-product-note summary:focus-visible, .materials-page a:focus-visible, .materials-page summary:focus-visible { outline: 3px solid var(--teal); outline-offset: 4px; }
.membrane-figure { margin: 0; min-width: 0; }
.membrane-diagram { position: relative; padding: 22px 0 26px; }
.membrane-drawing { display: block; width: 100%; height: auto; }
.membrane-outside, .membrane-inside { position: absolute; inset-inline: 5%; display: flex; align-items: center; justify-content: space-between; font-size: 12px; font-weight: 700; }
.membrane-outside { top: 0; }
.membrane-outside span { color: #387b9a; }
.membrane-inside { bottom: 0; }
.membrane-inside span { color: #9b4d2c; }
.membrane-layer-labels { position: absolute; inset: 31% 0 auto auto; width: 34%; display: grid; gap: clamp(8px, 1.4vw, 21px); margin: 0; padding: 0; list-style: none; }
.membrane-layer-labels li { width: fit-content; padding: 3px 6px; background: rgba(251,253,252,.95); border-radius: 3px; font-size: clamp(10px, 1.15vw, 13px); font-weight: 700; white-space: nowrap; }
.membrane-layer-labels b { margin-right: 5px; color: var(--teal-dark); font-size: 10px; }
.membrane-figure figcaption { margin-top: 12px; color: var(--ink-soft); font-size: 10px; line-height: 1.7; }
.material-product-note { grid-column: 1 / -1; min-width: 0; margin: 0 30px 26px; border-top: 1px solid var(--line); }
.material-product-note summary { min-height: 52px; padding-block: 14px; color: var(--ink); cursor: pointer; font-size: 14px; font-weight: 700; }
.material-product-note p { max-width: 56em; color: var(--ink-soft); font-size: 13px; }
.material-product-note .material-link { font-size: 13px; }
.material-mini-layers { display: flex; flex-wrap: wrap; gap: 6px; margin-block: 10px; }
.material-mini-layers span { padding: 6px 10px; border-radius: 4px; background: var(--mist); font-size: 11px; }
.material-mini-layers span:nth-child(2) { color: #fff; background: var(--ink); }

.materials-page { --material-paper: #fff; }
.materials-page .materials-shell { width: min(1160px, calc(100% - 48px)); margin-inline: auto; }
.materials-header { background: var(--material-paper); border-bottom: 1px solid var(--line); }
.materials-header-inner { min-height: 76px; display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 20px; }
.materials-header-actions { display: flex; align-items: center; gap: 18px; }
.materials-header-actions .material-link { gap: 8px; }
.materials-brand { display: flex; align-items: center; gap: 12px; text-decoration: none; font-size: 13px; font-weight: 800; }
.materials-brand img { width: 42px; height: 42px; object-fit: contain; }
.materials-brand > span { min-width: 0; overflow-wrap: anywhere; }
.materials-brand strong, .materials-brand small { display: block; font-size: inherit; }
.materials-brand small { margin-top: 3px; font-size: 11px; }
.materials-header .material-link { flex-shrink: 0; font-size: 12px; }
.materials-breadcrumb { display: flex; flex-wrap: wrap; gap: 8px; margin: 26px 0 0; color: var(--ink-soft); font-size: 11px; }
.materials-hero { max-width: 880px; padding: 54px 0 42px; }
.materials-hero h1 { margin: 0; font-size: clamp(30px, 4.5vw, 55px); line-height: 1.4; letter-spacing: -.04em; text-wrap: balance; }
.materials-deck { max-width: 47em; margin: 24px 0 14px; color: var(--ink-soft); font-size: 15px; line-height: 1.95; }
.materials-meta { color: var(--ink-soft); font-size: 11px; }
.materials-layout { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 60px; align-items: start; padding-bottom: 76px; }
.materials-toc { position: sticky; top: 30px; padding-top: 24px; border-top: 2px solid var(--ink); }
.materials-toc strong { display: block; margin-bottom: 12px; font-size: 12px; }
.materials-toc a { display: block; padding: 10px 0; color: var(--ink-soft); text-decoration: none; font-size: 12px; }
.materials-toc a:hover { color: var(--teal-dark); text-decoration: underline; }
.materials-article { min-width: 0; }
.materials-section { margin-bottom: 52px; scroll-margin-top: 28px; }
.materials-section h2 { margin: 0 0 22px; font-size: clamp(23px, 2.5vw, 29px); line-height: 1.55; }
.materials-section h3 { margin: 0 0 8px; font-size: 17px; }
.materials-section p { color: var(--ink-soft); font-size: 14px; line-height: 1.95; }
.materials-diagram-panel { padding: clamp(18px, 4vw, 36px); border-radius: 12px; background: var(--mist); }
.materials-diagram-panel .membrane-figure { max-width: 620px; margin-inline: auto; }
.materials-diagram-panel .membrane-layer-labels { gap: clamp(12px, 2vw, 27px); }
.materials-diagram-panel .membrane-layer-labels li { font-size: clamp(10px, 1.3vw, 14px); }
.materials-diagram-panel .membrane-figure figcaption { font-size: 11px; }
.materials-layer-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; margin: 26px 0 0; }
.materials-layer-list > div { padding-top: 16px; border-top: 2px solid var(--line); }
.materials-layer-list dt { font-size: 14px; font-weight: 800; }
.materials-layer-list dt small { display: block; color: var(--teal-dark); margin-bottom: 5px; font-size: 10px; }
.materials-layer-list dd { margin: 10px 0 0; color: var(--ink-soft); font-size: 12px; line-height: 1.9; }
.materials-mechanism { display: grid; grid-template-columns: 56px minmax(0, 1fr); gap: 16px; padding: 24px 0; border-top: 1px solid var(--line); }
.materials-mechanism > span { display: grid; width: 50px; height: 50px; place-items: center; background: var(--mist); border-radius: 50%; color: var(--teal-dark); font-size: 12px; font-weight: 800; }
.materials-mechanism p { margin: 0; }
.materials-inline-note { padding-left: 16px; border-left: 3px solid var(--line); }
.materials-faq { border-top: 1px solid var(--line); }
.materials-faq details { border-bottom: 1px solid var(--line); }
.materials-faq summary { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 62px; padding: 17px 0; font-size: 14px; font-weight: 700; line-height: 1.7; cursor: pointer; list-style: none; }
.materials-faq summary::-webkit-details-marker { display: none; }
.materials-faq summary::after { content: '+'; flex: 0 0 20px; font-size: 22px; font-weight: 400; }
.materials-faq details[open] summary::after { content: '−'; }
.materials-faq details p { margin: 0 0 22px; }
.materials-sources { padding-top: 24px; border-top: 1px solid var(--line); }
.materials-sources h2 { margin: 0; font-size: 15px; }
.materials-sources ol { padding-left: 20px; font-size: 12px; line-height: 2; }
.materials-sources a { overflow-wrap: anywhere; text-underline-offset: 3px; }
.materials-sources p { font-size: 11px; }
.materials-return { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 26px; margin-top: 32px; background: var(--mist); border-radius: 10px; }
.materials-return p { margin: 0; font-weight: 700; font-size: 13px; }
.materials-footer { padding: 24px; border-top: 1px solid var(--line); text-align: center; color: var(--ink-soft); font-size: 11px; }
@media (max-width: 700px) {
  .material-teaser { grid-template-columns: 1fr; gap: 20px; margin-bottom: 42px; padding: 22px; }
  .material-teaser .membrane-figure { width: min(100%, 420px); margin-inline: auto; }
  .material-teaser h2 { font-size: 25px; }
  .membrane-layer-labels { gap: 9px; width: 37%; }
  .membrane-layer-labels li { font-size: 10px; }
  .material-product-note { margin-inline: 20px; }
  .materials-page .materials-shell { width: calc(100% - 36px); }
  .materials-header-inner { min-height: 66px; gap: 12px; }
  .materials-header-actions { gap: 8px; }
  .materials-header .material-link { max-width: 94px; }
  .materials-brand small { display: none; }
  .materials-brand { font-size: 11px; gap: 8px; }
  .materials-brand img { width: 33px; height: 33px; }
  .materials-header .material-link { font-size: 11px; }
  .materials-hero { padding: 36px 0 28px; }
  .materials-hero h1 { font-size: 32px; }
  .materials-deck { font-size: 14px; }
  .materials-layout { grid-template-columns: 1fr; gap: 34px; padding-bottom: 40px; }
  .materials-toc { position: static; display: grid; grid-template-columns: 1fr 1fr; column-gap: 16px; padding-top: 14px; }
  .materials-toc strong { grid-column: 1 / -1; margin-bottom: 3px; }
  .materials-toc a { padding-block: 9px; font-size: 11px; }
  .materials-section { margin-bottom: 38px; }
  .materials-diagram-panel { padding: 16px 10px; }
  .materials-diagram-panel .membrane-layer-labels { gap: 10px; }
  .materials-diagram-panel .membrane-layer-labels li { padding: 2px 4px; font-size: 10px; }
  .materials-layer-list { grid-template-columns: 1fr; gap: 16px; }
  .materials-layer-list dt small { display: inline; margin-right: 8px; }
  .materials-layer-list dd { margin-top: 5px; font-size: 13px; }
  .materials-mechanism { grid-template-columns: 43px minmax(0, 1fr); gap: 12px; }
  .materials-mechanism > span { width: 40px; height: 40px; font-size: 10px; }
  .materials-return { display: block; padding: 22px; }
  .materials-return .material-link { margin-top: 8px; font-size: 13px; }
}
@media (prefers-reduced-motion: reduce) { .materials-page { scroll-behavior: auto; } }