:root {
  --paper: #e3e2de;
  --paper-warm: #f4f1e9;
  --ink: #141414;
  --cobalt: #1351aa;
  --cobalt-bright: #286fd0;
  --copper: #a85c2f;
  --line: #c7c7c7;
  --line-dark: rgba(20, 20, 20, .22);
  --line-light: rgba(227, 226, 222, .22);
  --display: "Arial Narrow", "Bahnschrift Condensed", "Helvetica Neue", Arial, sans-serif;
  --sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --mono: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--ink); }
body { margin: 0; min-width: 320px; background: var(--paper); color: var(--ink); font-family: var(--sans); font-size: 16px; line-height: 1.75; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
img { display: block; width: 100%; height: 100%; object-fit: cover; }
figure, h1, h2, h3, p, ol { margin-top: 0; }
button, input, textarea { font: inherit; }
em { color: var(--cobalt); font-style: normal; }

.skip-link { position: fixed; top: -80px; left: 18px; z-index: 200; padding: 10px 16px; background: var(--paper); color: var(--ink); }
.skip-link:focus { top: 12px; }

.site-header { position: fixed; inset: 0 0 auto; z-index: 100; height: 76px; display: grid; grid-template-columns: minmax(320px, 1fr) auto auto; align-items: center; gap: 40px; padding: 0 30px 0 20px; border-bottom: 1px solid rgba(227,226,222,.26); background: rgba(20,20,20,.9); color: var(--paper); backdrop-filter: blur(10px); }
.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.brand > span:last-child { display: grid; line-height: 1.2; }
.brand strong { overflow: hidden; font-size: 12px; letter-spacing: .05em; text-overflow: ellipsis; white-space: nowrap; }
.brand small { margin-top: 5px; color: rgba(227,226,222,.56); font-family: var(--mono); font-size: 8px; letter-spacing: .12em; }
.brand-mark { position: relative; display: block; width: 32px; height: 32px; flex: 0 0 auto; }
.brand-mark i { position: absolute; left: 2px; width: 28px; height: 3px; background: var(--cobalt-bright); transform-origin: left center; }
.brand-mark i:nth-child(1) { top: 7px; transform: rotate(18deg); }
.brand-mark i:nth-child(2) { top: 15px; transform: rotate(-12deg); }
.brand-mark i:nth-child(3) { top: 23px; transform: rotate(9deg); }
.site-nav { display: flex; align-items: center; gap: 28px; }
.site-nav a { position: relative; color: rgba(227,226,222,.7); font-family: var(--mono); font-size: 9px; letter-spacing: .08em; }
.site-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -10px; height: 2px; background: var(--cobalt-bright); transition: right .22s ease; }
.site-nav a:hover, .site-nav a:focus-visible { color: var(--paper); }
.site-nav a:hover::after, .site-nav a:focus-visible::after { right: 0; }
.menu-toggle { display: none; }

main { position: relative; overflow: hidden; }
.route-line { position: absolute; z-index: 21; inset: 0 auto 0 72px; width: 3px; background: var(--cobalt); pointer-events: none; }
.numbered-section { position: relative; min-height: 580px; padding-left: 74px; scroll-margin-top: 74px; }
.dark-section { background: var(--ink); color: var(--paper); }
.section-index { position: absolute; z-index: 30; inset: 0 auto 0 0; width: 74px; display: flex; flex-direction: column; align-items: center; padding-top: 96px; border-right: 1px solid var(--line-light); color: var(--paper); background: rgba(20,20,20,.86); }
.section-index b { font-family: var(--display); font-size: 26px; line-height: 1; }
.section-index span { margin-top: 18px; font-family: var(--mono); font-size: 8px; letter-spacing: .12em; writing-mode: vertical-rl; }
.section-index.index-ink { border-color: var(--line-dark); background: rgba(227,226,222,.9); color: var(--ink); }
.eyebrow { margin-bottom: 18px; color: var(--cobalt); font-family: var(--mono); font-size: 10px; font-weight: 700; letter-spacing: .15em; }
.eyebrow-light { color: #78aaf0; }
h1, h2 { margin-bottom: 0; font-family: var(--display); font-weight: 900; letter-spacing: -.055em; line-height: .88; }
h1 { font-size: clamp(78px, 9vw, 148px); }
h2 { font-size: clamp(58px, 6.4vw, 105px); }
h3 { font-family: var(--display); letter-spacing: -.035em; line-height: 1; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 24px; border: 1px solid transparent; border-radius: 0; font-family: var(--mono); font-size: 10px; font-weight: 700; letter-spacing: .08em; transition: background .2s ease, color .2s ease, border-color .2s ease; }
.button-blue { background: var(--cobalt); color: #fff; }
.button-blue:hover { background: var(--ink); }
.button-ink { background: var(--ink); color: var(--paper); }
.button-ink:hover { background: var(--cobalt); }
.text-link { display: inline-block; padding-bottom: 2px; border-bottom: 2px solid var(--cobalt); font-family: var(--mono); font-size: 9px; font-weight: 700; letter-spacing: .08em; }
.link-light { color: var(--paper); }

.hero { min-height: 920px; display: flex; align-items: center; background: var(--paper-warm); }
.hero-visual { position: absolute; inset: 0; margin: 0; }
.hero-visual::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(244,241,233,.98) 8%, rgba(244,241,233,.87) 36%, rgba(244,241,233,.08) 68%); }
.hero-copy { position: relative; z-index: 8; width: min(770px, 58vw); padding: 92px 0 30px max(5vw, 70px); }
.hero h1 em { color: var(--ink); }
.hero-lead { max-width: 590px; margin: 34px 0 28px; font-size: 15px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.scroll-cue { position: absolute; z-index: 9; right: 34px; bottom: 28px; display: flex; align-items: center; gap: 16px; font-family: var(--mono); font-size: 8px; letter-spacing: .1em; }
.scroll-cue i { display: block; width: 76px; height: 3px; background: var(--cobalt); }

.anatomy { display: grid; grid-template-columns: .88fr 1.12fr; min-height: 720px; }
.anatomy-copy { align-self: center; padding: 100px 7vw 80px 5vw; }
.anatomy-copy > p:not(.eyebrow) { max-width: 520px; margin: 30px 0 34px; color: rgba(227,226,222,.7); }
.layer-ledger { margin: 0; padding: 0; border-top: 1px solid var(--line-light); list-style: none; }
.layer-ledger li { display: grid; grid-template-columns: 42px 1fr auto; align-items: center; gap: 18px; padding: 14px 0; border-bottom: 1px solid var(--line-light); }
.layer-ledger b { color: #78aaf0; font-family: var(--mono); font-size: 10px; }
.layer-ledger span { font-size: 18px; font-weight: 700; }
.layer-ledger small { color: rgba(227,226,222,.52); font-size: 10px; }
.anatomy-visual { position: relative; min-height: 720px; margin: 0; }

.product-route { padding-bottom: 96px; background: var(--paper); }
.route-heading { display: grid; grid-template-columns: 1.15fr .85fr; gap: 8%; padding: 120px 6vw 64px 6vw; }
.route-heading .eyebrow { grid-column: 1 / -1; }
.route-heading p:last-child { align-self: end; max-width: 520px; margin-bottom: 5px; }
.family-visual { position: relative; height: min(42vw, 510px); margin: 0; border-top: 1px solid var(--line-dark); border-bottom: 1px solid var(--line-dark); }
.category-track { position: relative; display: grid; grid-template-columns: repeat(7, 1fr); margin: 0 6vw 28px; padding: 26px 0 0; list-style: none; }
.category-track::before { content: ""; position: absolute; left: 0; right: 0; top: 10px; height: 3px; background: var(--cobalt); }
.category-track li { position: relative; min-height: 92px; padding: 0 12px 0 0; }
.category-track li::before { content: ""; position: absolute; top: -20px; left: 0; width: 12px; height: 12px; background: var(--paper); border: 3px solid var(--cobalt); border-radius: 50%; }
.category-track b { display: block; color: var(--cobalt); font-family: var(--mono); font-size: 9px; }
.category-track span { display: block; margin-top: 10px; font-weight: 700; line-height: 1.35; }
.product-route > .text-link { margin-left: 6vw; }

.application { min-height: 830px; }
.application-visual { position: absolute; inset: 0; margin: 0; }
.application-visual::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(20,20,20,.93), rgba(20,20,20,.36) 55%, rgba(20,20,20,.08)); }
.application-copy { position: relative; z-index: 8; width: min(720px, 58vw); padding: 140px 0 100px 6vw; }
.application-copy > p:not(.eyebrow) { max-width: 580px; margin: 34px 0; color: rgba(227,226,222,.7); }
.direction-line { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line-light); border-bottom: 1px solid var(--line-light); }
.direction-line span { padding: 13px 6px; color: rgba(227,226,222,.76); font-family: var(--mono); font-size: 9px; text-align: center; }

.manufacturing { display: grid; grid-template-columns: .72fr 1.28fr; min-height: 720px; background: var(--paper-warm); }
.manufacturing-copy { align-self: center; padding: 110px 5vw 90px 5vw; }
.manufacturing-copy > p:not(.eyebrow) { max-width: 520px; margin: 32px 0; }
.process-notes { display: grid; gap: 10px; padding-top: 20px; border-top: 1px solid var(--line-dark); }
.process-notes span { padding-left: 18px; border-left: 3px solid var(--cobalt); font-size: 10px; }
.manufacturing-visual { position: relative; min-height: 720px; margin: 0; }

.quality { min-height: 1200px; }
.quality-scan { position: relative; min-height: 660px; }
.quality-scan > figure { position: absolute; inset: 0; margin: 0; }
.quality-scan > figure::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(20,20,20,.95), rgba(20,20,20,.6) 48%, rgba(20,20,20,.06)); }
.quality-copy { position: relative; z-index: 8; width: min(680px, 55vw); padding: 120px 0 80px 6vw; }
.quality-copy > p:not(.eyebrow) { max-width: 560px; margin: 30px 0 26px; color: rgba(227,226,222,.72); }
.material-study { display: grid; grid-template-columns: 1.15fr .85fr; min-height: 540px; border-top: 1px solid var(--line-light); }
.material-study figure { position: relative; min-height: 540px; margin: 0; }
.material-study > div { align-self: center; padding: 70px 6vw; }
.material-study h3 { margin: 0 0 28px; font-size: clamp(38px, 4vw, 66px); }
.material-study > div > p:last-child { color: rgba(227,226,222,.68); }

.development { display: grid; grid-template-columns: .72fr 1.28fr; background: var(--paper); }
.development-heading { padding: 110px 3vw 70px 6vw; }
.development-heading strong { display: block; margin: 28px 0 38px; color: var(--cobalt); font-family: var(--display); font-size: clamp(130px, 17vw, 270px); font-weight: 900; letter-spacing: -.08em; line-height: .68; }
.development-heading h2 { font-size: clamp(52px, 5.4vw, 88px); }
.timeline { align-self: center; margin: 0; padding: 80px 6vw 60px 2vw; border-left: 1px solid var(--line-dark); list-style: none; }
.timeline li { display: grid; grid-template-columns: 72px 1fr; gap: 22px; padding: 22px 0; border-bottom: 1px solid var(--line-dark); }
.timeline time { color: var(--cobalt); font-family: var(--mono); font-size: 12px; font-weight: 700; }
.timeline b { display: block; font-size: 18px; }
.timeline p { margin: 7px 0 4px; font-size: 12px; }
.timeline a { color: var(--cobalt); font-family: var(--mono); font-size: 8px; font-weight: 700; }
.storage-visual { position: relative; grid-column: 1 / -1; height: min(48vw, 650px); margin: 0; border-top: 1px solid var(--line-dark); }

.contact { display: grid; grid-template-columns: .9fr 1.1fr; gap: 7%; padding: 120px 6vw 105px 10vw; background: var(--paper-warm); }
.contact-intro h2 { font-size: clamp(58px, 5.8vw, 94px); }
.contact-intro > p:not(.eyebrow):not(.official-link) { margin: 34px 0 20px; }
.contact-intro > p a { color: var(--cobalt); border-bottom: 1px solid currentColor; font-weight: 700; }
.official-link { display: grid; gap: 6px; margin: 0 0 42px; padding: 18px 0; border-top: 1px solid var(--line-dark); border-bottom: 1px solid var(--line-dark); }
.official-link a { color: var(--cobalt); font-weight: 700; }
.official-link small { color: rgba(20,20,20,.58); font-size: 10px; }
form { display: grid; grid-template-columns: 1fr 1fr; gap: 22px 30px; }
form label { display: grid; gap: 7px; color: rgba(20,20,20,.6); font-family: var(--mono); font-size: 9px; letter-spacing: .08em; }
form label:nth-child(3) { grid-column: 1 / -1; }
input, textarea { width: 100%; padding: 10px 0; border: 0; border-bottom: 1px solid rgba(20,20,20,.38); border-radius: 0; outline: 0; background: transparent; color: var(--ink); resize: vertical; }
input:focus, textarea:focus { border-color: var(--cobalt); }
.form-result { grid-column: 1 / -1; min-height: 24px; margin: 0; color: var(--cobalt); font-size: 10px; }
.ledger-heading { padding-bottom: 18px; border-bottom: 2px solid var(--ink); }
.ledger-heading h3 { margin: 0 0 5px; font-size: 30px; }
.ledger-heading p { margin: 0; font-size: 10px; }
.source-ledger ol { margin: 0; padding: 0; list-style: none; }
.source-ledger li { border-bottom: 1px solid var(--line-dark); scroll-margin-top: 84px; }
.source-ledger li > div { display: grid; grid-template-columns: 38px 1fr minmax(180px, .8fr); align-items: center; gap: 15px; padding: 15px 0; }
.source-ledger b { color: var(--cobalt); font-family: var(--mono); font-size: 11px; }
.source-ledger span { font-size: 12px; font-weight: 700; }
.source-ledger em { color: rgba(20,20,20,.55); font-family: var(--sans); font-size: 9px; text-align: right; }

footer { min-height: 126px; display: flex; align-items: center; justify-content: space-between; gap: 30px; padding: 0 34px 0 20px; border-top: 1px solid var(--line-light); background: var(--ink); color: rgba(227,226,222,.62); font-family: var(--mono); font-size: 9px; letter-spacing: .08em; }
.footer-brand { display: flex; align-items: center; gap: 10px; }
.footer-brand strong { color: var(--paper); font-family: var(--sans); font-size: 11px; }
:focus-visible { outline: 2px solid var(--cobalt-bright); outline-offset: 4px; }

@media (max-width: 1120px) {
  .site-header { grid-template-columns: 1fr auto; }
  .site-nav { position: fixed; inset: 76px 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 0; padding: 10px 22px 20px; border-bottom: 1px solid var(--line-light); background: rgba(20,20,20,.98); transform: translateY(-140%); opacity: 0; pointer-events: none; transition: transform .25s ease, opacity .25s ease; }
  .site-nav.is-open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .site-nav a { padding: 14px 0; border-bottom: 1px solid var(--line-light); }
  .menu-toggle { display: grid; grid-template-columns: 18px auto; align-items: center; gap: 5px 8px; border: 0; padding: 8px; background: transparent; cursor: pointer; }
  .menu-toggle span { display: block; grid-column: 1; width: 18px; height: 2px; background: var(--paper); }
  .menu-toggle b { grid-column: 2; grid-row: 1 / span 2; color: rgba(227,226,222,.7); font-family: var(--mono); font-size: 8px; }
  .route-heading { grid-template-columns: 1fr; gap: 28px; }
  .category-track { grid-template-columns: repeat(4, 1fr); row-gap: 34px; }
  .category-track::before { display: none; }
  .category-track li { padding-top: 12px; border-top: 3px solid var(--cobalt); }
  .category-track li::before { display: none; }
  .manufacturing { grid-template-columns: 1fr; }
  .manufacturing-visual { min-height: 540px; }
  .development { grid-template-columns: 1fr; }
  .timeline { padding: 0 6vw 80px; border-left: 0; }
  .contact { grid-template-columns: 1fr; gap: 76px; }
}

@media (max-width: 720px) {
  body { font-size: 14px; }
  .site-header { height: 68px; padding: 0 14px 0 10px; }
  .brand strong { max-width: 190px; font-size: 10px; }
  .brand small { font-size: 7px; }
  .brand-mark { width: 26px; height: 28px; }
  .brand-mark i { width: 22px; }
  .site-nav { inset: 68px 0 auto; grid-template-columns: 1fr; }
  .numbered-section { padding-left: 42px; }
  .route-line { left: 40px; width: 2px; }
  .section-index { width: 42px; padding-top: 82px; }
  .section-index b { font-size: 20px; }
  .section-index span { font-size: 6px; }
  h1 { font-size: clamp(66px, 20vw, 94px); }
  h2 { font-size: clamp(48px, 14vw, 70px); }
  .hero { min-height: 840px; align-items: flex-start; }
  .hero-visual::after { background: linear-gradient(180deg, rgba(244,241,233,.98) 8%, rgba(244,241,233,.84) 52%, rgba(244,241,233,.05) 84%); }
  .hero-copy { width: auto; padding: 116px 22px 40px 22px; }
  .hero-lead { margin-top: 26px; }
  .hero-actions { display: grid; }
  .scroll-cue { right: 14px; }
  .scroll-cue i { width: 42px; }
  .anatomy { grid-template-columns: 1fr; }
  .anatomy-copy { padding: 94px 22px 50px; }
  .anatomy-visual { min-height: 450px; }
  .layer-ledger li { grid-template-columns: 34px 1fr; }
  .layer-ledger small { grid-column: 2; }
  .route-heading { padding: 90px 22px 42px; }
  .family-visual { height: 400px; }
  .category-track { grid-template-columns: 1fr 1fr; margin: 0 22px 26px; }
  .product-route > .text-link { margin-left: 22px; }
  .application { min-height: 820px; }
  .application-visual::after { background: linear-gradient(180deg, rgba(20,20,20,.92), rgba(20,20,20,.55) 58%, rgba(20,20,20,.12)); }
  .application-copy { width: auto; padding: 104px 22px 70px; }
  .direction-line { grid-template-columns: 1fr 1fr; }
  .manufacturing-copy { padding: 94px 22px 60px; }
  .manufacturing-visual { min-height: 430px; }
  .quality { min-height: 0; }
  .quality-scan { min-height: 800px; }
  .quality-scan > figure::after { background: linear-gradient(180deg, rgba(20,20,20,.96), rgba(20,20,20,.65) 60%, rgba(20,20,20,.1)); }
  .quality-copy { width: auto; padding: 100px 22px 60px; }
  .material-study { grid-template-columns: 1fr; }
  .material-study figure { min-height: 390px; }
  .material-study > div { padding: 58px 22px 70px; }
  .development-heading { padding: 94px 22px 56px; }
  .development-heading strong { margin: 30px 0 38px; font-size: 38vw; }
  .timeline { padding: 0 22px 60px; }
  .timeline li { grid-template-columns: 58px 1fr; }
  .storage-visual { height: 440px; }
  .contact { padding: 94px 22px 78px; }
  form { grid-template-columns: 1fr; }
  form label:nth-child(3), .form-result { grid-column: 1; }
  .source-ledger li > div { grid-template-columns: 32px 1fr; }
  .source-ledger em { grid-column: 2; text-align: left; }
  footer { min-height: 170px; flex-direction: column; align-items: flex-start; justify-content: center; padding: 28px 16px; }
}