:root {
  --ink: #0a0d0f;
  --navy: #102b38;
  --navy-deep: #08151c;
  --paper: #f2efe7;
  --paper-bright: #faf8f1;
  --copper: #c46b32;
  --copper-dark: #87401e;
  --steel: #9aa3a8;
  --line: rgba(10, 13, 15, .18);
  --max: 1440px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 86px; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif; line-height: 1.65; }
body.menu-open { overflow: hidden; }
img { display: block; width: 100%; }
a { color: inherit; }
button, input, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid #ffb06f; outline-offset: 4px; }
.skip-link { position: fixed; z-index: 100; top: 12px; left: 12px; padding: 10px 14px; background: var(--paper-bright); color: var(--ink); transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }
.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; }

.site-header { position: fixed; z-index: 50; inset: 0 0 auto; height: 78px; display: flex; align-items: center; justify-content: space-between; padding: 0 clamp(22px, 4vw, 72px); color: var(--paper-bright); background: rgba(8, 21, 28, .94); border-bottom: 1px solid rgba(255,255,255,.14); backdrop-filter: blur(18px); }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; line-height: 1.1; }
.brand-mark { width: 38px; height: 38px; fill: none; stroke: var(--copper); stroke-width: 6; stroke-linecap: square; flex: 0 0 auto; }
.brand-mark circle { fill: var(--paper); stroke: none; }
.brand span { display: grid; gap: 5px; }
.brand strong { font-size: 15px; letter-spacing: .08em; }
.brand small { font-size: 9px; letter-spacing: .22em; color: var(--steel); }
.site-nav { display: flex; align-items: center; gap: clamp(20px, 2.6vw, 40px); }
.site-nav a { position: relative; color: #edf0ed; font-size: 13px; text-decoration: none; letter-spacing: .06em; }
.site-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -9px; height: 2px; background: var(--copper); transition: right .25s ease; }
.site-nav a:hover::after, .site-nav a:focus-visible::after { right: 0; }
.menu-toggle { display: none; width: 48px; height: 48px; padding: 13px 10px; color: inherit; background: transparent; border: 0; cursor: pointer; }
.menu-toggle > span:not(.sr-only) { display: block; width: 28px; height: 2px; margin: 5px auto; background: currentColor; transition: transform .25s, opacity .25s; }

.hero { position: relative; min-height: min(920px, 100svh); display: grid; align-items: end; overflow: hidden; color: white; background: var(--navy-deep); }
.hero-image, .hero-shade, .hero-grid { position: absolute; inset: 0; height: 100%; object-fit: cover; }
.hero-image { object-position: 55% center; }
.hero-shade { background: linear-gradient(90deg, rgba(5,12,16,.94) 0%, rgba(5,12,16,.67) 43%, rgba(5,12,16,.1) 78%), linear-gradient(0deg, rgba(5,12,16,.82), transparent 50%); }
.hero-grid { background-image: linear-gradient(rgba(255,255,255,.055) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.055) 1px, transparent 1px); background-size: 9vw 9vw; mask-image: linear-gradient(90deg, black, transparent 72%); }
.hero-content { position: relative; z-index: 2; width: min(760px, 78vw); padding: 170px clamp(24px, 7vw, 110px) clamp(70px, 8vw, 120px); }
.eyebrow { margin: 0 0 24px; color: #d3a17d; font-size: 11px; font-weight: 700; letter-spacing: .24em; }
.eyebrow.dark { color: var(--copper-dark); }
.hero h1 { margin: 0; font-size: clamp(92px, 14vw, 208px); font-weight: 800; line-height: .79; letter-spacing: -.08em; }
.hero h1 span { display: block; }
.hero h1 span:last-child { margin-left: .48em; color: transparent; -webkit-text-stroke: 1px rgba(255,255,255,.8); }
.hero-lead { max-width: 610px; margin: 42px 0 0; padding-left: 24px; border-left: 3px solid var(--copper); color: #dde2e2; font-size: clamp(16px, 1.5vw, 21px); }
.hero-actions { display: flex; align-items: center; gap: 28px; margin-top: 42px; }
.button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; padding: 12px 24px; border: 1px solid transparent; border-radius: 0; text-decoration: none; cursor: pointer; }
.button-primary { background: var(--copper-dark); color: white; }
.button-primary:hover { background: #672f17; }
.text-link { min-height: 44px; display: inline-flex; align-items: center; gap: 10px; color: white; text-underline-offset: 7px; }
.hero-index { position: absolute; z-index: 2; right: clamp(24px, 4vw, 70px); bottom: 45px; width: 120px; display: flex; justify-content: space-between; padding-top: 10px; border-top: 1px solid rgba(255,255,255,.5); font: 11px/1 monospace; }

.section-paper { background-color: var(--paper); background-image: linear-gradient(rgba(10,13,15,.045) 1px, transparent 1px), linear-gradient(90deg, rgba(10,13,15,.045) 1px, transparent 1px); background-size: 72px 72px; }
.intro { display: grid; grid-template-columns: 100px minmax(320px, 1fr) minmax(320px, 1fr); gap: clamp(30px, 6vw, 100px); padding: clamp(90px, 10vw, 160px) clamp(24px, 7vw, 110px); border-bottom: 1px solid var(--line); }
.section-number { color: var(--copper-dark); font: 13px/1 monospace; }
.intro h2, .story-heading h2, .applications h2, .contact h2 { margin: 0; font-size: clamp(42px, 5.4vw, 78px); line-height: 1.05; letter-spacing: -.06em; }
.intro-copy { padding-top: 42px; font-size: clamp(16px, 1.5vw, 20px); }
.intro-copy p { margin: 0 0 28px; }

.product-index { display: grid; grid-template-columns: minmax(320px, .9fr) minmax(460px, 1.1fr); gap: 6vw; padding: clamp(90px, 10vw, 150px) clamp(24px, 7vw, 110px); color: white; background: var(--navy-deep); }
.section-heading h2 { margin: 0; font-size: clamp(44px, 5.7vw, 82px); line-height: 1.04; letter-spacing: -.055em; }
.product-lines { margin: 0; padding: 0; list-style: none; border-top: 1px solid rgba(255,255,255,.24); }
.product-lines li { display: grid; grid-template-columns: 50px minmax(120px, .6fr) 1fr; gap: 18px; align-items: center; min-height: 94px; border-bottom: 1px solid rgba(255,255,255,.24); }
.product-lines span { color: var(--copper); font: 11px/1 monospace; }
.product-lines strong { font-size: 20px; }
.product-lines small { color: #aeb8bb; font-size: 13px; }

.material-story { padding: clamp(90px, 10vw, 160px) clamp(24px, 7vw, 110px); }
.story-heading { display: grid; grid-template-columns: 100px 1fr; column-gap: 40px; margin-bottom: 100px; }
.story-heading .eyebrow { grid-column: 2; }
.story-heading h2 { grid-column: 2; }
.story-row { display: grid; grid-template-columns: minmax(280px, .72fr) minmax(440px, 1.28fr); gap: clamp(42px, 7vw, 110px); align-items: center; margin-bottom: clamp(100px, 13vw, 190px); }
.story-row:last-child { margin-bottom: 0; }
.story-row figure { position: relative; margin: 0; }
.story-row figure::before { content: ""; position: absolute; z-index: 1; inset: -18px 18px 18px -18px; border: 1px solid var(--copper); pointer-events: none; }
.story-row img { position: relative; z-index: 2; aspect-ratio: 16 / 10; object-fit: cover; }
.story-row figcaption { position: absolute; z-index: 3; right: 0; bottom: -42px; font: 11px/1 monospace; letter-spacing: .14em; }
.story-flex { grid-template-columns: minmax(440px, 1.28fr) minmax(280px, .72fr); }
.story-flex figure::before { inset: 18px -18px -18px 18px; }
.story-copy { max-width: 560px; }
.story-kicker { color: var(--copper-dark); font: 11px/1 monospace; letter-spacing: .18em; }
.story-copy h3 { margin: 22px 0; font-size: clamp(30px, 3.3vw, 52px); line-height: 1.12; letter-spacing: -.04em; }
.story-copy p { color: #34393b; }
.story-copy ul { display: grid; gap: 8px; padding: 20px 0 0; list-style: none; border-top: 1px solid var(--line); }
.story-copy li { display: flex; gap: 12px; }
.story-copy li::before { content: "—"; color: var(--copper); }

.contact-layer { padding: clamp(90px, 10vw, 150px) clamp(24px, 7vw, 110px); color: white; background: var(--navy); }
.layer-image { width: min(66%, 920px); margin-left: auto; }
.layer-image img { aspect-ratio: 16 / 8.5; object-fit: cover; }
.layer-copy { position: relative; width: min(700px, 66vw); margin-top: clamp(-180px, -11vw, -100px); padding: clamp(36px, 6vw, 80px); background: var(--navy-deep); border-left: 3px solid var(--copper); }
.layer-copy h2 { margin: 0; font-size: clamp(42px, 5.8vw, 80px); line-height: 1.04; letter-spacing: -.06em; }
.layer-copy > p:last-child { max-width: 560px; color: #bdc7ca; }
.layer-cutaway { display: grid; grid-template-columns: 1.25fr .75fr; gap: 48px; align-items: end; margin-top: 110px; }
.layer-cutaway img { aspect-ratio: 16 / 9; object-fit: cover; }
.layer-cutaway div { padding: 40px 0; border-top: 1px solid rgba(255,255,255,.35); }
.layer-cutaway span { display: block; color: #efb187; font: 11px/1 monospace; }
.layer-cutaway strong { display: block; margin: 22px 0; font-size: clamp(28px, 3vw, 46px); }
.layer-cutaway p { color: #bdc7ca; }

.applications { padding: clamp(90px, 10vw, 160px) clamp(24px, 7vw, 110px); }
.applications-intro { display: grid; grid-template-columns: 100px 1fr 1fr; gap: 38px; align-items: end; margin-bottom: 80px; }
.applications-intro .eyebrow { grid-column: 2; margin-bottom: 0; align-self: start; }
.applications-intro h2 { grid-column: 2; }
.applications-intro > p:last-child { grid-column: 3; color: #43494b; }
.application-feature, .application-split article { position: relative; overflow: hidden; color: white; background: var(--navy-deep); }
.application-feature img { aspect-ratio: 16 / 7; object-fit: cover; opacity: .88; }
.application-feature::after, .application-split article::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(3,9,12,.88), transparent 62%); pointer-events: none; }
.application-feature > div, .application-split article > div { position: absolute; z-index: 2; left: clamp(24px, 4vw, 58px); right: 24px; bottom: clamp(22px, 4vw, 52px); }
.application-feature span, .application-split span { color: #efb187; font: 10px/1 monospace; letter-spacing: .15em; }
.application-feature h3 { margin: 12px 0 4px; font-size: clamp(30px, 4vw, 56px); }
.application-feature p, .application-split p { max-width: 600px; margin: 0; color: #d5dcdd; }
.application-split { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin-top: 1px; background: var(--paper); }
.application-split img { aspect-ratio: 16 / 11; height: 100%; object-fit: cover; opacity: .86; }
.application-split h3 { margin: 12px 0 4px; font-size: clamp(24px, 2.8vw, 40px); }

.development { display: grid; grid-template-columns: minmax(320px, .78fr) minmax(480px, 1.22fr); gap: 7vw; padding: clamp(90px, 10vw, 150px) clamp(24px, 7vw, 110px); color: white; background: var(--ink); }
.development-heading h2 { margin: 0; font-size: clamp(44px, 5.8vw, 82px); line-height: 1.04; letter-spacing: -.06em; }
.timeline { margin: 0; padding: 0; list-style: none; border-top: 1px solid rgba(255,255,255,.3); }
.timeline li { display: grid; grid-template-columns: 130px 1fr; gap: 32px; padding: 35px 0; border-bottom: 1px solid rgba(255,255,255,.3); }
.timeline time { color: var(--copper); font: 16px/1.4 monospace; }
.timeline strong { font-size: 22px; }
.timeline p { margin: 8px 0 0; color: #adb5b7; }

.contact { display: grid; grid-template-columns: minmax(360px, .9fr) minmax(460px, 1.1fr); gap: clamp(60px, 9vw, 140px); padding: clamp(90px, 10vw, 160px) clamp(24px, 7vw, 110px); }
.contact-info .section-number { margin-bottom: 70px; }
.contact address { margin-top: 70px; font-style: normal; border-top: 1px solid var(--line); }
.contact address p { display: grid; grid-template-columns: 100px 1fr; gap: 24px; margin: 0; padding: 15px 0; border-bottom: 1px solid var(--line); }
.contact address span { color: var(--copper-dark); font-size: 12px; }
.contact address a { text-underline-offset: 4px; }
.contact address a { min-height: 44px; display: inline-flex; align-items: center; }
.inquiry-form { align-self: end; display: grid; grid-template-columns: 1fr 1fr; gap: 28px 24px; padding-top: 25px; border-top: 2px solid var(--ink); }
.field { display: grid; gap: 8px; }
.field-wide { grid-column: 1 / -1; }
.field label { font-size: 12px; font-weight: 700; }
.field input, .field textarea { width: 100%; min-height: 48px; padding: 12px 3px; color: var(--ink); background: transparent; border: 0; border-bottom: 1px solid #71787a; border-radius: 0; }
.field textarea { resize: vertical; }
.button-dark { justify-self: start; background: var(--ink); color: white; }
.button-dark:hover { background: var(--navy); }
.form-status { grid-column: 1 / -1; min-height: 25px; margin: 0; color: #7a3015; font-weight: 700; }

.site-footer { display: grid; grid-template-columns: 1fr auto auto; gap: 40px; align-items: center; min-height: 140px; padding: 34px clamp(24px, 7vw, 110px); color: white; background: var(--navy-deep); border-top: 1px solid rgba(255,255,255,.2); }
.site-footer p { margin: 0; color: #aab4b6; font-size: 11px; }
.footer-brand small { letter-spacing: .06em; }
.site-header > .brand, .site-footer .brand { min-height: 48px; }

@media (max-width: 1020px) {
  .intro { grid-template-columns: 70px 1fr; }
  .intro-copy { grid-column: 2; max-width: 680px; padding-top: 0; }
  .product-index, .development, .contact { grid-template-columns: 1fr; }
  .product-index { gap: 70px; }
  .applications-intro { grid-template-columns: 70px 1fr; }
  .applications-intro > p:last-child { grid-column: 2; }
  .development { gap: 70px; }
}

@media (max-width: 820px) {
  html { scroll-padding-top: 70px; }
  .site-header { height: 70px; padding: 0 18px; }
  .brand-mark { width: 34px; height: 34px; }
  .menu-toggle { display: block; }
  .site-nav { position: fixed; top: 70px; left: 0; width: 100vw; height: calc(100svh - 70px); z-index: 49; display: flex; flex-direction: column; align-items: stretch; justify-content: center; gap: 0; padding: 24px; background: var(--navy-deep); transform: translateX(100%); visibility: hidden; transition: transform .28s ease, visibility .28s; }
  .nav-open .site-nav { transform: translateX(0); visibility: visible; }
  .site-nav a { display: flex; align-items: center; min-height: 62px; padding: 10px 4px; font-size: 24px; border-bottom: 1px solid rgba(255,255,255,.2); }
  .site-nav a::after { display: none; }
  .nav-open .menu-toggle > span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-open .menu-toggle > span:nth-child(2) { opacity: 0; }
  .nav-open .menu-toggle > span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .hero { min-height: 790px; }
  .hero-content { width: 100%; padding: 150px 22px 90px; }
  .hero h1 { font-size: clamp(84px, 25vw, 124px); }
  .hero-lead { max-width: 520px; }
  .hero-index { display: none; }
  .story-row, .story-flex { grid-template-columns: 1fr; }
  .story-rigid .story-copy { order: 2; }
  .story-rigid figure { order: 1; }
  .story-copy { max-width: none; }
  .layer-image { width: 88%; }
  .layer-copy { width: 88%; }
  .layer-cutaway { grid-template-columns: 1fr; }
  .application-split { grid-template-columns: 1fr; }
  .application-feature img, .application-split img { aspect-ratio: 4 / 3; }
  .site-footer { grid-template-columns: 1fr; gap: 18px; }
}

@media (max-width: 560px) {
  .brand strong { font-size: 13px; }
  .brand small { display: none; }
  .hero { min-height: 750px; }
  .hero-image { object-position: 64% center; }
  .hero-shade { background: linear-gradient(90deg, rgba(5,12,16,.9), rgba(5,12,16,.32)), linear-gradient(0deg, rgba(5,12,16,.95), transparent 70%); }
  .hero h1 { font-size: 88px; }
  .hero h1 span:last-child { margin-left: .18em; }
  .hero-lead { margin-top: 32px; font-size: 16px; }
  .hero-actions { align-items: stretch; flex-direction: column; gap: 14px; }
  .text-link { justify-content: center; }
  .intro, .applications-intro { grid-template-columns: 1fr; gap: 28px; }
  .intro-heading, .intro-copy, .applications-intro .eyebrow, .applications-intro h2, .applications-intro > p:last-child { grid-column: 1; }
  .section-number { margin-bottom: 10px; }
  .intro h2, .story-heading h2, .applications h2, .contact h2 { font-size: 42px; }
  .product-index { grid-template-columns: 1fr; }
  .product-lines li { grid-template-columns: 34px 1fr; padding: 17px 0; }
  .product-lines small { grid-column: 2; }
  .story-heading { grid-template-columns: 1fr; margin-bottom: 70px; }
  .story-heading .eyebrow, .story-heading h2 { grid-column: 1; }
  .story-row figure::before { inset: -10px 10px 10px -10px; }
  .story-flex figure::before { inset: 10px -10px -10px 10px; }
  .story-row img { aspect-ratio: 4 / 3; }
  .layer-image { width: 100%; }
  .layer-copy { width: calc(100% - 18px); margin-top: -45px; padding: 32px 22px; }
  .layer-copy h2 { font-size: 42px; }
  .layer-cutaway { margin-top: 70px; }
  .layer-cutaway div { padding-bottom: 0; }
  .application-feature > div, .application-split article > div { left: 20px; bottom: 22px; }
  .application-feature p, .application-split p { font-size: 13px; }
  .timeline li { grid-template-columns: 1fr; gap: 12px; }
  .contact-info .section-number { margin-bottom: 30px; }
  .contact address { margin-top: 50px; }
  .contact address p { grid-template-columns: 78px 1fr; gap: 12px; overflow-wrap: anywhere; }
  .inquiry-form { grid-template-columns: 1fr; }
  .field-wide { grid-column: 1; }
  .button-dark { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}