:root {
  --navy: #061524;
  --navy-2: #0a263c;
  --ink: #111820;
  --paper: #f2efe7;
  --white: #fffdf8;
  --copper: #c66a35;
  --steel: #9aa6ad;
  --line: rgba(17, 24, 32, .18);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  line-height: 1.65;
  overflow-x: hidden;
}
img { display: block; width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 200; padding: 10px 16px; background: var(--white); color: var(--ink); }
.skip-link:focus { top: 12px; }

.site-header {
  position: absolute;
  inset: 0 0 auto;
  z-index: 20;
  height: 92px;
  padding: 0 clamp(24px, 5vw, 76px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--white);
  border-bottom: 1px solid rgba(255,255,255,.15);
}
.brand { display: inline-flex; align-items: center; gap: 12px; letter-spacing: .06em; }
.brand-mark { width: 42px; height: 42px; fill: none; stroke: currentColor; stroke-width: 1.5; }
.brand-mark path { stroke: var(--copper); stroke-width: 2; }
.brand-mark .brand-core { fill: var(--copper); stroke: none; }
.brand strong, .brand small { display: block; }
.brand strong { font-size: 16px; font-weight: 650; }
.brand small { font-size: 8px; letter-spacing: .2em; opacity: .7; }
.site-nav { display: flex; align-items: center; gap: clamp(24px, 3vw, 50px); font-size: 14px; }
.site-nav a { position: relative; padding: 10px 0; }
.site-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 2px; height: 1px; background: var(--copper); transition: right .25s ease; }
.site-nav a:hover::after, .site-nav a:focus-visible::after { right: 0; }
.menu-toggle { display: none; border: 0; background: transparent; padding: 8px; color: inherit; }
.menu-toggle span { display: block; width: 26px; height: 1px; margin: 6px 0; background: currentColor; }

.hero { min-height: 880px; height: 100svh; position: relative; display: grid; align-items: center; color: var(--white); background: var(--navy); }
.hero-image, .hero-shade { position: absolute; inset: 0; height: 100%; object-fit: cover; }
.hero-shade { background: linear-gradient(90deg, rgba(3,13,23,.92) 0%, rgba(3,13,23,.66) 42%, rgba(3,13,23,.06) 72%); }
.hero-copy { position: relative; z-index: 2; width: min(760px, 78vw); margin-left: clamp(24px, 8vw, 130px); padding-top: 90px; }
.eyebrow { margin: 0 0 22px; font-size: 12px; letter-spacing: .28em; text-transform: uppercase; color: var(--copper); font-weight: 650; }
.eyebrow.dark { color: #8e481e; }
.hero h1 { margin: 0; font-size: clamp(64px, 8.6vw, 136px); line-height: .94; letter-spacing: -.065em; font-weight: 680; }
.hero h1 em { color: transparent; -webkit-text-stroke: 1px rgba(255,255,255,.65); font-style: normal; }
.hero-lead { max-width: 600px; margin: 38px 0 32px; font-size: clamp(16px, 1.6vw, 21px); color: rgba(255,255,255,.74); }
.hero-actions { display: flex; gap: 42px; }
.text-link { display: inline-flex; align-items: center; gap: 20px; padding: 12px 0 8px; border-bottom: 1px solid rgba(17,24,32,.45); font-size: 14px; font-weight: 650; letter-spacing: .06em; }
.text-link.light { border-color: rgba(255,255,255,.46); }
.text-link span { color: var(--copper); font-size: 20px; }
.hero-index { position: absolute; z-index: 2; right: clamp(24px, 5vw, 76px); bottom: 42px; display: flex; align-items: center; gap: 12px; font-size: 10px; letter-spacing: .1em; }
.hero-index i { display: block; width: 88px; height: 1px; background: rgba(255,255,255,.35); position: relative; }
.hero-index i::before { content: ""; position: absolute; inset: 0 auto 0 0; width: 22%; background: var(--copper); }

.section-number { font-size: 11px; letter-spacing: .18em; text-transform: uppercase; color: #6c747a; white-space: nowrap; }
.light-number { color: rgba(255,255,255,.52); }
.opening { padding: clamp(90px, 13vw, 190px) clamp(24px, 8vw, 130px); display: grid; grid-template-columns: minmax(140px, 1fr) 3.8fr; gap: clamp(40px, 8vw, 150px); background: var(--paper); }
.opening h2 { max-width: 1050px; margin: 0; font-size: clamp(44px, 6.4vw, 96px); line-height: 1.05; letter-spacing: -.055em; font-weight: 600; }
.opening p { max-width: 720px; margin: 40px 0 0 auto; font-size: 17px; color: #525b62; }

.product-flow { position: relative; background: var(--white); padding-top: 120px; border-top: 1px solid var(--line); overflow: hidden; }
.flow-line { position: absolute; top: 54px; left: -5vw; right: -5vw; height: 34px; }
.flow-line::before { content: ""; position: absolute; inset: 15px 0 auto; height: 4px; background: var(--navy); }
.flow-line span { position: absolute; right: 18%; top: 3px; width: 28px; height: 28px; border-radius: 50%; background: var(--copper); box-shadow: inset 0 0 0 8px var(--white); border: 2px solid var(--navy); }
.flow-heading { padding: 0 clamp(24px, 8vw, 130px) 70px; display: flex; align-items: end; justify-content: space-between; gap: 30px; }
.flow-heading h2 { margin: 0; text-align: right; font-size: clamp(56px, 8vw, 120px); line-height: .95; letter-spacing: -.065em; font-weight: 640; }
.marquee { border-block: 1px solid var(--line); overflow: hidden; padding: 22px 0; }
.marquee-track { width: max-content; display: flex; align-items: center; gap: 26px; padding-left: 5vw; font-size: clamp(18px, 2vw, 32px); white-space: nowrap; animation: drift 28s linear infinite alternate; }
.marquee-track i { width: 7px; height: 7px; border-radius: 50%; background: var(--copper); }
@keyframes drift { to { transform: translateX(-18%); } }
.product-stage { display: grid; grid-template-columns: 1.65fr 1fr; min-height: 650px; }
.stage-image { margin: 0; min-height: 650px; overflow: hidden; }
.stage-image img { height: 100%; object-fit: cover; }
.stage-copy { padding: clamp(55px, 7vw, 110px); display: flex; flex-direction: column; justify-content: center; border-left: 1px solid var(--line); }
.stage-no { color: var(--copper); font-size: 11px; letter-spacing: .2em; }
.stage-kicker { margin-top: auto; font-size: 12px; letter-spacing: .24em; color: #737b81; }
.stage-copy h3 { margin: 10px 0 22px; font-size: clamp(36px, 4vw, 62px); line-height: 1.05; letter-spacing: -.04em; }
.stage-copy p:last-child { max-width: 420px; margin-bottom: auto; color: #5b6268; }

.applications { background: var(--navy); color: var(--white); }
.application-title { padding: clamp(90px, 12vw, 170px) clamp(24px, 8vw, 130px); display: flex; justify-content: space-between; align-items: end; gap: 40px; }
.application-title .section-number { color: rgba(255,255,255,.5); }
.application-title h2 { margin: 0; text-align: right; font-size: clamp(50px, 7vw, 104px); line-height: 1; letter-spacing: -.06em; font-weight: 600; }
.application-row { min-height: 660px; display: grid; grid-template-columns: .9fr 1.6fr; border-top: 1px solid rgba(255,255,255,.16); }
.application-row.reverse { grid-template-columns: 1.6fr .9fr; }
.application-row.reverse .application-copy { order: 2; }
.application-row.reverse .application-image { order: 1; }
.application-copy { padding: clamp(50px, 7vw, 110px); display: flex; flex-direction: column; justify-content: center; }
.application-copy > span { align-self: flex-start; padding-bottom: 10px; border-bottom: 1px solid currentColor; font-size: 11px; opacity: .55; }
.application-copy .eyebrow { margin-top: auto; }
.application-copy h3 { margin: 0 0 24px; font-size: clamp(38px, 4.8vw, 72px); line-height: 1.02; letter-spacing: -.055em; }
.application-copy p:last-child { max-width: 430px; margin-bottom: auto; color: rgba(255,255,255,.63); }
.application-image { margin: 0; min-height: 660px; overflow: hidden; }
.application-image img { height: 100%; object-fit: cover; transition: transform .8s cubic-bezier(.2,.7,.2,1); }
.application-row:hover .application-image img { transform: scale(1.025); }
.light-row { color: var(--ink); background: var(--paper); }
.light-row .application-copy p:last-child { color: #5b6268; }
.solar-row { background: var(--navy-2); }

.layers { min-height: 850px; display: grid; grid-template-columns: 1fr 1.35fr; color: var(--white); background: #040e18; }
.layers-copy { padding: clamp(70px, 8vw, 130px); display: flex; flex-direction: column; }
.layers-copy .eyebrow { margin-top: auto; }
.layers h2 { margin: 0 0 30px; font-size: clamp(54px, 6.5vw, 96px); line-height: .98; letter-spacing: -.06em; font-weight: 600; }
.layers-note { max-width: 500px; color: rgba(255,255,255,.62); }
.layer-list { list-style: none; padding: 0; margin: 56px 0 auto; border-top: 1px solid rgba(255,255,255,.2); }
.layer-list li { display: grid; grid-template-columns: 44px 1fr 1.5fr; gap: 16px; align-items: center; padding: 17px 0; border-bottom: 1px solid rgba(255,255,255,.16); }
.layer-list span { color: var(--copper); font-size: 10px; }
.layer-list b { font-size: 14px; }
.layer-list small { color: rgba(255,255,255,.5); }
.layers-image { margin: 0; min-height: 850px; overflow: hidden; }
.layers-image img { height: 100%; object-fit: cover; object-position: center; }

.manufacturing { display: grid; grid-template-columns: 1.5fr 1fr; min-height: 720px; background: var(--paper); }
.manufacturing-image { margin: 0; min-height: 720px; overflow: hidden; }
.manufacturing-image img { height: 100%; object-fit: cover; }
.manufacturing-copy { padding: clamp(60px, 8vw, 130px); display: flex; flex-direction: column; justify-content: center; }
.manufacturing h2 { margin: 80px 0 28px; font-size: clamp(46px, 5vw, 76px); line-height: 1.03; letter-spacing: -.055em; font-weight: 600; }
.manufacturing p { max-width: 470px; color: #586168; }
.manufacturing .text-link { align-self: flex-start; margin-top: 30px; }

.development { padding: clamp(90px, 12vw, 180px) clamp(24px, 8vw, 130px); background: var(--navy); color: var(--white); }
.development-head { display: flex; justify-content: space-between; align-items: end; gap: 40px; }
.development h2 { margin: 0; text-align: right; font-size: clamp(54px, 7vw, 105px); line-height: .96; letter-spacing: -.06em; font-weight: 600; }
.timeline { position: relative; display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; margin: 110px 0 80px; border-top: 1px solid rgba(255,255,255,.3); }
.timeline article { position: relative; padding: 35px clamp(20px, 4vw, 58px) 0 0; }
.timeline article::before { content: ""; position: absolute; top: -7px; left: 0; width: 13px; height: 13px; border-radius: 50%; background: var(--copper); box-shadow: 0 0 0 7px var(--navy); }
.timeline span { color: var(--copper); font-size: 12px; letter-spacing: .18em; }
.timeline h3 { margin: 18px 0 12px; font-size: 25px; }
.timeline p { max-width: 330px; margin: 0; color: rgba(255,255,255,.58); }
.development-visual { margin: 0; height: clamp(340px, 45vw, 680px); overflow: hidden; }
.development-visual img { height: 100%; object-fit: cover; }

.contact { display: grid; grid-template-columns: 1.15fr 1fr; gap: clamp(60px, 10vw, 170px); padding: clamp(90px, 12vw, 180px) clamp(24px, 8vw, 130px); background: var(--white); }
.contact h2 { margin: 0; font-size: clamp(52px, 6.5vw, 98px); line-height: 1; letter-spacing: -.06em; font-weight: 600; }
address { margin-top: 80px; font-style: normal; border-top: 1px solid var(--line); }
address div { display: grid; grid-template-columns: 110px 1fr; padding: 22px 0; border-bottom: 1px solid var(--line); }
address span { color: #777f85; font-size: 12px; }
address p { margin: 0; }
.inquiry-form { align-self: end; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.inquiry-form label { display: block; margin-bottom: 34px; color: #5f686f; font-size: 12px; letter-spacing: .06em; }
.inquiry-form input, .inquiry-form select, .inquiry-form textarea { width: 100%; margin-top: 8px; padding: 12px 0; color: var(--ink); background: transparent; border: 0; border-bottom: 1px solid #92999d; border-radius: 0; outline: 0; }
.inquiry-form textarea { resize: vertical; }
.inquiry-form input:focus, .inquiry-form select:focus, .inquiry-form textarea:focus { border-color: var(--copper); }
.inquiry-form button { width: 100%; padding: 18px 22px; display: flex; justify-content: space-between; color: var(--white); background: var(--navy); border: 0; cursor: pointer; }
.inquiry-form button span { color: var(--copper); }
.form-status { min-height: 26px; margin: 18px 0 0; color: #934d26; font-size: 13px; }

.site-footer { min-height: 130px; padding: 30px clamp(24px, 5vw, 76px); display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 30px; background: #030b13; color: rgba(255,255,255,.68); font-size: 11px; }
.site-footer p:last-child { text-align: right; }
.footer-brand { color: var(--white); }
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}

@media (max-width: 980px) {
  .site-header { height: 76px; padding-inline: 24px; }
  .menu-toggle { display: block; position: relative; z-index: 30; }
  .site-nav { position: fixed; inset: 0; padding: 120px 32px 50px; flex-direction: column; align-items: flex-start; gap: 12px; background: rgba(4,14,24,.98); transform: translateX(100%); transition: transform .28s ease; }
  .site-nav.is-open { transform: none; }
  .site-nav a { width: 100%; padding: 18px 0; border-bottom: 1px solid rgba(255,255,255,.16); font-size: 24px; }
  .hero { min-height: 760px; }
  .hero-copy { width: calc(100% - 48px); margin-left: 24px; }
  .hero h1 { font-size: clamp(60px, 12vw, 92px); }
  .opening { grid-template-columns: 1fr; }
  .opening p { margin-left: 0; }
  .product-stage, .applications .application-row, .applications .application-row.reverse, .layers, .manufacturing, .contact { grid-template-columns: 1fr; }
  .application-row.reverse .application-copy, .application-row.reverse .application-image { order: initial; }
  .application-copy { min-height: 520px; }
  .application-image, .stage-image { min-height: 500px; }
  .layers-image { min-height: 560px; }
  .manufacturing-image { min-height: 560px; }
  .timeline { gap: 35px; }
}

@media (max-width: 620px) {
  .brand-mark { width: 36px; height: 36px; }
  .hero { height: auto; min-height: 760px; }
  .hero-image { object-position: 66% center; }
  .hero-shade { background: linear-gradient(90deg, rgba(3,13,23,.94), rgba(3,13,23,.58)); }
  .hero-copy { padding-top: 65px; }
  .hero h1 { font-size: clamp(56px, 18vw, 78px); }
  .hero-lead { font-size: 15px; }
  .hero-actions { gap: 22px; flex-wrap: wrap; }
  .hero-index { right: 24px; }
  .opening, .application-title, .development-head { display: block; }
  .opening h2 { margin-top: 50px; font-size: 43px; }
  .flow-heading { display: block; }
  .flow-heading h2, .application-title h2, .development h2 { margin-top: 40px; text-align: left; }
  .product-stage { min-height: auto; }
  .stage-image { min-height: 330px; }
  .stage-copy { min-height: 420px; }
  .application-row { min-height: auto; }
  .application-copy { min-height: 430px; padding: 55px 24px; }
  .application-image { min-height: 330px; }
  .layers-copy, .manufacturing-copy { padding: 75px 24px; }
  .layers-image, .manufacturing-image { min-height: 380px; }
  .layer-list li { grid-template-columns: 36px 1fr; }
  .layer-list small { grid-column: 2; }
  .timeline { grid-template-columns: 1fr; margin-top: 80px; border-top: 0; border-left: 1px solid rgba(255,255,255,.3); }
  .timeline article { padding: 0 0 48px 34px; }
  .timeline article::before { top: 4px; left: -7px; }
  .development-visual { height: 360px; }
  .contact { padding-block: 90px; }
  .contact h2 { font-size: 48px; }
  address { margin-top: 55px; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .site-footer { grid-template-columns: 1fr; text-align: left; }
  .site-footer p { margin: 0; }
  .site-footer p:last-child { text-align: left; }
}