:root {
  --mettal-silver: #d9dde0;
  --mettal-pale: #f2f3f2;
  --mettal-white: #fbfbf8;
  --mettal-graphite: #20272b;
  --mettal-graphite-2: #303a3f;
  --mettal-ink: #222628;
  --mettal-muted: #667077;
  --mettal-line: rgba(34, 38, 40, .22);
  --mettal-copper: #aa6142;
  --mettal-brass: #b7994f;
  --mettal-edge: clamp(1rem, 4.5vw, 5.5rem);
}

.mettal-page { color: var(--mettal-ink); background: var(--mettal-silver); }
.mettal-page .site-header { background: rgba(224, 227, 228, .9); backdrop-filter: blur(18px); }

.mettal-hero {
  position: relative;
  display: grid;
  grid-template-columns: 1.12fr .88fr;
  grid-template-rows: minmax(calc(100svh - 5.25rem), auto) 4.5rem;
  min-height: 100svh;
  padding-top: 5.25rem;
  overflow: hidden;
  background:
    repeating-linear-gradient(90deg, rgba(255,255,255,.16) 0, rgba(255,255,255,.16) 1px, rgba(58,68,73,.035) 2px, transparent 5px),
    linear-gradient(120deg, #e8eaeb, #c9ced1 58%, #b8bfc3);
}
.mettal-hero::after {
  position: absolute;
  z-index: 0;
  top: 5.25rem;
  bottom: 4.5rem;
  left: 42%;
  width: 22%;
  background: linear-gradient(105deg, transparent, rgba(255,255,255,.48), transparent);
  content: "";
  transform: skewX(-18deg);
  animation: mettalSheen 8s ease-in-out infinite alternate;
  pointer-events: none;
}
.mettal-hero__product,
.mettal-hero__copy { position: relative; z-index: 1; }
.mettal-hero__product {
  display: grid;
  grid-template-rows: 1fr auto;
  min-width: 0;
  margin: 0;
  padding: clamp(2rem, 4vw, 4.5rem);
  border-right: 1px solid rgba(34,38,40,.25);
}
.mettal-hero__plate {
  display: grid;
  place-items: center;
  min-height: 0;
  border: 1px solid rgba(34,38,40,.18);
  background: rgba(248,249,248,.72);
  box-shadow: inset 0 0 4rem rgba(61,71,76,.08), 0 2rem 4rem rgba(38,45,49,.12);
}
.mettal-hero__plate img {
  width: min(86%, 43rem);
  max-height: 68svh;
  object-fit: contain;
  mix-blend-mode: multiply;
  filter: drop-shadow(0 1.7rem 1.3rem rgba(24,29,31,.2));
  animation: mettalProductEnter .9s cubic-bezier(.2,.7,.2,1) both;
}
.mettal-hero__product figcaption {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding-top: 1rem;
  color: var(--mettal-muted);
  font-size: .57rem;
  line-height: 1.6;
}
.mettal-hero__product figcaption span { color: var(--mettal-copper); font-weight: 700; letter-spacing: .14em; }
.mettal-hero__product figcaption b { font-weight: 400; }
.mettal-hero__copy {
  display: grid;
  align-content: center;
  padding: clamp(3rem, 5.2vw, 6.5rem);
  background: rgba(233,236,237,.56);
}
.mettal-hero__copy nav { display: flex; flex-wrap: wrap; gap: .55rem; margin-bottom: clamp(2.5rem, 6vh, 5rem); color: var(--mettal-muted); font-size: .61rem; letter-spacing: .07em; }
.mettal-hero__copy nav a { text-decoration: none; }
.mettal-kicker { margin: 0 0 1rem; color: var(--mettal-copper); font-size: .61rem; font-weight: 700; letter-spacing: .19em; }
.mettal-hero h1 { margin: 0; font: 500 clamp(4rem, 7vw, 8.5rem)/.8 Arial, sans-serif; letter-spacing: -.085em; }
.mettal-hero h1 span { color: #747f85; }
.mettal-hero h2 { margin: 2.1rem 0 0; font: 400 clamp(1.55rem, 2vw, 2.25rem)/1.3 STSong, "Noto Serif SC", serif; }
.mettal-hero__lead { max-width: 42rem; margin: 1rem 0 0; color: var(--mettal-muted); font-size: .79rem; line-height: 1.95; }
.mettal-hero__facts { display: grid; margin: 2rem 0 0; border-top: 1px solid var(--mettal-line); }
.mettal-hero__facts > div { display: grid; grid-template-columns: 6rem 1fr; gap: 1rem; padding: .8rem 0; border-bottom: 1px solid var(--mettal-line); }
.mettal-hero__facts dt { color: var(--mettal-muted); font-size: .57rem; }
.mettal-hero__facts dd { margin: 0; font: 400 .74rem/1.5 STSong, "Noto Serif SC", serif; }
.mettal-hero__action { display: flex; justify-content: space-between; margin-top: 1.2rem; padding: 1rem 0; border-bottom: 1px solid var(--mettal-ink); font-size: .65rem; font-weight: 700; text-decoration: none; }
.mettal-spectrum { z-index: 2; grid-column: 1 / -1; display: grid; grid-template-columns: repeat(5, 1fr); border-top: 1px solid var(--mettal-line); }
.mettal-spectrum i { background-image: var(--texture); background-position: center; background-size: cover; filter: saturate(.78); }

.mettal-nav { position: sticky; z-index: 18; top: 4.35rem; display: flex; overflow-x: auto; border-bottom: 1px solid var(--mettal-line); background: rgba(236,239,239,.96); scrollbar-width: none; }
.mettal-nav { transition: transform .32s cubic-bezier(.2,.7,.2,1), opacity .24s ease; will-change: transform; }
.mettal-nav.is-scroll-hidden { opacity: 0; transform: translateY(calc(-100% - .25rem)); pointer-events: none; }
.mettal-nav::-webkit-scrollbar { display: none; }
.mettal-nav a { flex: 1 0 auto; padding: .95rem 1rem; border-right: 1px solid var(--mettal-line); font-size: .61rem; font-weight: 700; text-align: center; text-decoration: none; transition: color .25s, background .25s; }
.mettal-nav a:hover { color: #fff; background: var(--mettal-graphite); }

.mettal-anatomy,
.mettal-metals,
.mettal-routes,
.mettal-system,
.mettal-data { scroll-margin-top: 8rem; padding: clamp(5rem, 9vw, 10rem) var(--mettal-edge); }
.mettal-anatomy { color: #f2f3f1; background: var(--mettal-graphite); }
.mettal-anatomy__head,
.mettal-system__head { display: grid; grid-template-columns: 1.1fr .9fr; gap: clamp(3rem, 8vw, 9rem); align-items: end; }
.mettal-anatomy__head > p,
.mettal-section-head > div > p,
.mettal-system__head > p,
.mettal-consult > div:first-child > p { grid-column: 1 / -1; margin: 0 0 1rem; color: #d69a7f; font-size: .6rem; font-weight: 700; letter-spacing: .19em; }
.mettal-anatomy__head h2,
.mettal-section-head h2,
.mettal-system__head h2,
.mettal-consult h2 { margin: 0; font: 400 clamp(3rem, 5.6vw, 6.6rem)/1.02 STSong, "Noto Serif SC", serif; letter-spacing: -.07em; }
.mettal-anatomy__head > span,
.mettal-system__head > span { color: rgba(255,255,255,.65); font-size: .75rem; line-height: 1.95; }
.mettal-equation { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; gap: 1.2rem; align-items: center; margin-top: clamp(4rem, 7vw, 7rem); }
.mettal-equation article { display: grid; grid-template-columns: auto 1fr; gap: 1.5rem; align-items: center; min-height: 16rem; padding: 1.7rem; border: 1px solid rgba(255,255,255,.26); background: rgba(255,255,255,.035); }
.mettal-equation article > span { color: #c8d0d3; font: 400 clamp(4rem, 6vw, 7rem)/1 STSong, serif; }
.mettal-equation__result { background: linear-gradient(135deg, rgba(170,97,66,.22), rgba(255,255,255,.03)) !important; }
.mettal-equation__result > span { color: #d69a7f !important; }
.mettal-equation article small { color: #d69a7f; font-size: .5rem; letter-spacing: .13em; }
.mettal-equation article h3 { margin: .8rem 0 .55rem; font: 400 1.45rem/1.2 STSong, "Noto Serif SC", serif; }
.mettal-equation article p { margin: 0; color: rgba(255,255,255,.61); font-size: .64rem; line-height: 1.75; }
.mettal-equation > b { color: #d69a7f; font: 400 1.7rem/1 STSong, serif; }
.mettal-principles { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 1.2rem; border-top: 1px solid rgba(255,255,255,.22); border-left: 1px solid rgba(255,255,255,.22); }
.mettal-principles article { display: grid; min-height: 13rem; padding: 1.2rem; border-right: 1px solid rgba(255,255,255,.22); border-bottom: 1px solid rgba(255,255,255,.22); }
.mettal-principles span { color: #d69a7f; font-size: .55rem; }
.mettal-principles b { align-self: center; font: 400 1.25rem/1.2 STSong, "Noto Serif SC", serif; }
.mettal-principles p { align-self: end; margin: 0; color: rgba(255,255,255,.58); font-size: .61rem; line-height: 1.7; }

.mettal-metals { background: #d9dddf; }
.mettal-section-head { display: grid; grid-template-columns: 1.08fr .92fr; gap: clamp(3rem, 8vw, 9rem); align-items: end; margin-bottom: clamp(3rem, 6vw, 5.5rem); }
.mettal-section-head > p { margin: 0; color: var(--mettal-muted); font-size: .76rem; line-height: 1.95; }
.mettal-gallery { display: grid; grid-template-columns: repeat(4, 1fr); grid-auto-rows: 23rem; border-top: 1px solid rgba(255,255,255,.5); border-left: 1px solid rgba(255,255,255,.5); background: var(--mettal-graphite); }
.mettal-sample { position: relative; margin: 0; overflow: hidden; border-right: 1px solid rgba(255,255,255,.5); border-bottom: 1px solid rgba(255,255,255,.5); }
.mettal-sample--hero { grid-column: span 2; }
.mettal-sample:nth-child(4) { grid-column: span 2; }
.mettal-sample img { width: 100%; height: 100%; object-fit: cover; transition: transform .75s cubic-bezier(.2,.7,.2,1), filter .5s; }
.mettal-sample:hover img { transform: scale(1.035); filter: contrast(1.08); }
.mettal-sample::after { position: absolute; inset: 35% 0 0; background: linear-gradient(transparent, rgba(22,26,28,.82)); content: ""; }
.mettal-sample figcaption { position: absolute; z-index: 2; right: 1.2rem; bottom: 1.2rem; left: 1.2rem; display: grid; gap: .4rem; color: #fff; }
.mettal-sample figcaption span { color: #efb89f; font-size: .53rem; font-weight: 700; letter-spacing: .14em; }
.mettal-sample figcaption b { font: 400 1.8rem/1 STSong, "Noto Serif SC", serif; }
.mettal-sample figcaption small { color: rgba(255,255,255,.68); font-size: .56rem; }
.mettal-sample-note { display: grid; grid-template-columns: auto 1fr; gap: 2rem; margin-top: 1rem; padding: 1rem 1.2rem; border-left: 3px solid var(--mettal-copper); background: rgba(255,255,255,.42); }
.mettal-sample-note b { font: 400 .93rem/1.45 STSong, "Noto Serif SC", serif; }
.mettal-sample-note p { margin: 0; color: var(--mettal-muted); font-size: .62rem; line-height: 1.75; }

.mettal-routes { color: #f6f5f1; background: var(--mettal-graphite-2); }
.mettal-section-head--light > p { color: rgba(255,255,255,.66); }
.mettal-route-comparison { display: grid; grid-template-columns: 1fr .48fr 1fr; border: 1px solid rgba(255,255,255,.24); }
.mettal-route-card { background: rgba(255,255,255,.025); }
.mettal-route-card > figure { position: relative; height: 25rem; margin: 0; overflow: hidden; }
.mettal-route-card > figure img { width: 100%; height: 100%; object-fit: cover; }
.mettal-route-card > figure figcaption { position: absolute; right: 1rem; bottom: 1rem; left: 1rem; padding-top: .75rem; border-top: 1px solid rgba(255,255,255,.65); font-size: .54rem; font-weight: 700; letter-spacing: .14em; }
.mettal-route-card > div { min-height: 25rem; padding: clamp(2rem, 3vw, 3.5rem); }
.mettal-route-card > div > span { color: #efb89f; font-size: .56rem; font-weight: 700; letter-spacing: .13em; }
.mettal-route-card h3 { margin: 1rem 0 .8rem; font: 400 clamp(2rem, 3vw, 3.4rem)/1.08 STSong, "Noto Serif SC", serif; }
.mettal-route-card p { margin: 0; color: rgba(255,255,255,.64); font-size: .69rem; line-height: 1.85; }
.mettal-route-card dl { margin: 2rem 0 0; border-top: 1px solid rgba(255,255,255,.24); }
.mettal-route-card dl > div { display: grid; grid-template-columns: .7fr 1.3fr; gap: 1rem; padding: .75rem 0; border-bottom: 1px solid rgba(255,255,255,.24); }
.mettal-route-card dt { color: #efb89f; font-size: .56rem; }
.mettal-route-card dd { margin: 0; font-size: .61rem; text-align: right; }
.mettal-activator { position: relative; display: grid; grid-template-rows: 1fr auto; margin: 0; overflow: hidden; border-right: 1px solid rgba(255,255,255,.24); border-left: 1px solid rgba(255,255,255,.24); background: #d7dcde; }
.mettal-activator__halo { position: absolute; top: 15%; left: 50%; width: 70%; aspect-ratio: 1; border: 1px solid rgba(31,38,42,.22); border-radius: 50%; transform: translateX(-50%); }
.mettal-activator > img { z-index: 1; align-self: center; justify-self: center; width: 88%; mix-blend-mode: multiply; }
.mettal-activator figcaption { z-index: 1; display: grid; gap: .45rem; padding: 1rem; color: var(--mettal-ink); border-top: 1px solid rgba(31,38,42,.2); background: rgba(255,255,255,.38); }
.mettal-activator figcaption b { font-size: .58rem; letter-spacing: .12em; }
.mettal-activator figcaption span { color: var(--mettal-muted); font-size: .51rem; line-height: 1.55; }
.mettal-oxidised-film { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 1rem; }
.mettal-oxidised-film figure { position: relative; height: 12rem; margin: 0; overflow: hidden; }
.mettal-oxidised-film img { width: 100%; height: 100%; object-fit: cover; }
.mettal-oxidised-film figcaption { position: absolute; right: .8rem; bottom: .7rem; left: .8rem; color: #fff; font-size: .5rem; font-weight: 700; letter-spacing: .12em; }

.mettal-system { color: #f5f3ef; background: #566168; }
.mettal-steps { display: grid; grid-template-columns: repeat(5, 1fr); margin: clamp(4rem, 7vw, 7rem) 0 0; padding: 0; border-top: 1px solid rgba(255,255,255,.28); border-left: 1px solid rgba(255,255,255,.28); list-style: none; }
.mettal-steps li { display: grid; align-content: start; min-height: 25rem; padding: 1.3rem; border-right: 1px solid rgba(255,255,255,.28); border-bottom: 1px solid rgba(255,255,255,.28); }
.mettal-steps li > span { color: #efb89f; font-size: .55rem; font-weight: 700; }
.mettal-steps li > i { position: relative; display: block; width: 4rem; height: 4rem; margin: 3rem 0 2.5rem; }
.step-surface::before,.step-surface::after { position: absolute; right: 0; left: 0; height: 1px; background: #efb89f; content: ""; }
.step-surface::before { top: 1.3rem; box-shadow: 0 1rem #efb89f; }
.step-primer::before { position: absolute; inset: .5rem 1.3rem; border: 1px solid #efb89f; content: ""; transform: rotate(20deg); }
.step-trowel::before { position: absolute; top: 1.5rem; right: .25rem; left: .25rem; height: 1.2rem; border: 1px solid #efb89f; content: ""; transform: skewX(-28deg); }
.step-polish::before { position: absolute; inset: .35rem; border: 1px solid #efb89f; border-radius: 50%; content: ""; }
.step-shield::before { position: absolute; inset: .15rem .8rem; border: 1px solid #efb89f; border-radius: 50% 50% 45% 45% / 35% 35% 65% 65%; content: ""; }
.mettal-steps h3 { margin: 0 0 .7rem; font: 400 1.3rem/1.2 STSong, "Noto Serif SC", serif; }
.mettal-steps p { margin: 0; color: rgba(255,255,255,.64); font-size: .64rem; line-height: 1.8; }

.mettal-data { background: var(--mettal-pale); }
.mettal-data-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--mettal-line); border-left: 1px solid var(--mettal-line); }
.mettal-data-grid article { display: grid; min-height: 18rem; padding: 1.3rem; border-right: 1px solid var(--mettal-line); border-bottom: 1px solid var(--mettal-line); }
.mettal-data-grid article > span { color: var(--mettal-copper); font-size: .56rem; }
.mettal-data-grid strong { align-self: center; color: #647077; font: 400 clamp(3rem, 5vw, 5.8rem)/1 STSong, serif; }
.mettal-data-grid strong small { font-size: .8rem; }
.mettal-data-grid p { align-self: end; margin: 0; color: var(--mettal-muted); font-size: .6rem; line-height: 1.65; }
.mettal-ratios { margin-top: 1rem; border: 1px solid var(--mettal-line); background: var(--mettal-white); }
.mettal-ratios summary { display: grid; grid-template-columns: .65fr 1.35fr auto; gap: 2rem; align-items: center; padding: 1.3rem; cursor: pointer; list-style: none; }
.mettal-ratios summary::-webkit-details-marker { display: none; }
.mettal-ratios summary span { color: var(--mettal-copper); font-size: .54rem; font-weight: 700; letter-spacing: .13em; }
.mettal-ratios summary b { font: 400 .85rem/1.4 STSong, "Noto Serif SC", serif; }
.mettal-ratios summary i { font-style: normal; transition: transform .25s; }
.mettal-ratios[open] summary i { transform: rotate(45deg); }
.mettal-ratios > div { padding: 2rem 1.3rem 1.3rem; border-top: 1px solid var(--mettal-line); }
.mettal-ratios > div > p { margin: 0 0 2rem; color: var(--mettal-muted); font-size: .66rem; line-height: 1.8; }
.mettal-ratios dl { display: grid; grid-template-columns: repeat(5, 1fr); margin: 0; border-top: 1px solid var(--mettal-line); border-left: 1px solid var(--mettal-line); }
.mettal-ratios dl > div { display: grid; gap: 2rem; padding: 1rem; border-right: 1px solid var(--mettal-line); border-bottom: 1px solid var(--mettal-line); }
.mettal-ratios dt { color: var(--mettal-muted); font-size: .57rem; }
.mettal-ratios dd { margin: 0; color: var(--mettal-copper); font: 400 1.4rem/1 STSong, serif; }

.mettal-consult { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(3rem, 8vw, 9rem); padding: clamp(5rem, 8vw, 8rem) var(--mettal-edge); color: #f5f3ef; background: #754c3d; }
.mettal-consult > div:last-child { align-self: end; border-top: 1px solid rgba(255,255,255,.35); }
.mettal-consult a { display: grid; grid-template-columns: 2.5rem 1fr auto; gap: 1rem; padding: 1.2rem 0; border-bottom: 1px solid rgba(255,255,255,.35); text-decoration: none; }
.mettal-consult a span { color: #efb89f; font-size: .55rem; }
.mettal-consult a b { font: 400 .9rem/1.3 STSong, "Noto Serif SC", serif; }
.mettal-consult a i { font-style: normal; }

@keyframes mettalProductEnter { from { opacity: 0; transform: translateY(1.5rem) scale(.98); } to { opacity: 1; transform: none; } }
@keyframes mettalSheen { from { transform: translateX(-70%) skewX(-18deg); } to { transform: translateX(190%) skewX(-18deg); } }
@media (prefers-reduced-motion: reduce) { .mettal-hero__plate img, .mettal-hero::after { animation: none; } .mettal-sample img, .mettal-nav { transition: none; } }

@media (max-width: 1050px) {
  .mettal-hero { grid-template-columns: 1fr; grid-template-rows: 62svh auto 4rem; padding-top: 5.25rem; }
  .mettal-hero__product { border-right: 0; border-bottom: 1px solid var(--mettal-line); }
  .mettal-hero__plate img { max-height: 47svh; }
  .mettal-hero__copy { padding: 5rem var(--mettal-edge); }
  .mettal-anatomy__head, .mettal-section-head, .mettal-system__head, .mettal-consult { grid-template-columns: 1fr; gap: 2rem; }
  .mettal-equation { grid-template-columns: 1fr; }
  .mettal-equation > b { text-align: center; }
  .mettal-principles { grid-template-columns: repeat(2, 1fr); }
  .mettal-gallery { grid-template-columns: repeat(2, 1fr); }
  .mettal-sample,
  .mettal-sample--hero,
  .mettal-sample:nth-child(4) { grid-column: auto; }
  .mettal-sample:nth-child(5) { grid-column: span 2; }
  .mettal-route-comparison { grid-template-columns: 1fr 1fr; }
  .mettal-activator { grid-column: 1 / -1; grid-row: 2; grid-template-columns: .5fr 1fr; grid-template-rows: 1fr; min-height: 24rem; }
  .mettal-activator > img { width: min(80%, 20rem); }
  .mettal-activator figcaption { align-content: end; border-top: 0; border-left: 1px solid rgba(31,38,42,.2); }
  .mettal-steps { grid-template-columns: repeat(3, 1fr); }
  .mettal-data-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 760px) {
  .mettal-hero { grid-template-rows: 52svh auto 3.2rem; padding-top: 4.7rem; }
  .mettal-hero__product { padding: 1rem; }
  .mettal-hero__plate img { width: 92%; max-height: 40svh; }
  .mettal-hero__product figcaption b { display: none; }
  .mettal-hero__copy { padding: 4rem 1rem; }
  .mettal-hero__copy nav { margin-bottom: 3rem; }
  .mettal-hero h1 { font-size: clamp(4.2rem, 20vw, 6.5rem); }
  .mettal-spectrum { height: 3.2rem; }
  .mettal-nav { top: 4.65rem; }
  .mettal-anatomy, .mettal-metals, .mettal-routes, .mettal-system, .mettal-data { padding: 4.5rem 1rem; }
  .mettal-anatomy__head h2, .mettal-section-head h2, .mettal-system__head h2, .mettal-consult h2 { font-size: clamp(2.8rem, 13vw, 4.6rem); }
  .mettal-equation article { grid-template-columns: 1fr; min-height: 20rem; }
  .mettal-principles, .mettal-gallery, .mettal-route-comparison, .mettal-oxidised-film, .mettal-steps, .mettal-data-grid, .mettal-ratios dl { grid-template-columns: 1fr; }
  .mettal-gallery { grid-auto-rows: 20rem; }
  .mettal-sample,
  .mettal-sample--hero,
  .mettal-sample:nth-child(4),
  .mettal-sample:nth-child(5) { grid-column: auto; }
  .mettal-sample-note { grid-template-columns: 1fr; gap: .6rem; }
  .mettal-activator { grid-column: auto; grid-row: auto; grid-template-columns: 1fr; grid-template-rows: 20rem auto; }
  .mettal-activator figcaption { border-top: 1px solid rgba(31,38,42,.2); border-left: 0; }
  .mettal-route-card > figure { height: 20rem; }
  .mettal-route-card > div { min-height: 0; }
  .mettal-steps li { min-height: 19rem; }
  .mettal-ratios summary { grid-template-columns: 1fr auto; gap: .6rem; }
  .mettal-ratios summary span { grid-column: 1 / -1; }
  .mettal-consult { padding: 4.5rem 1rem; }
}