:root {
  --ink: #0a0c0c;
  --panel: #171a19;
  --paper: #e9e5da;
  --orange: #e36f2d;
  --steel: #9aa39d;
  --green: #5e8c78;
  --line: rgba(233, 229, 218, 0.18);
  --page: min(1480px, calc(100vw - 96px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--ink); }
body {
  margin: 0;
  color: var(--paper);
  background: var(--ink);
  font-family: "Arial Narrow", "Microsoft YaHei UI", "PingFang SC", sans-serif;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
img { display: block; width: 100%; }
button, input, select, textarea { font: inherit; }
section { scroll-margin-top: 88px; }

.skip-link { position: fixed; left: 18px; top: -80px; z-index: 100; padding: 10px 14px; background: var(--paper); color: var(--ink); }
.skip-link:focus { top: 18px; }
.section-shell { width: var(--page); margin-inline: auto; }
.eyebrow { margin: 0 0 18px; color: var(--steel); font-size: 12px; font-weight: 700; letter-spacing: .2em; text-transform: uppercase; }
.eyebrow span { color: var(--orange); margin-right: 14px; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { line-height: 1.08; font-weight: 600; }
h2 { margin-bottom: 26px; font-family: "Songti SC", "STSong", serif; font-size: clamp(42px, 5.4vw, 82px); letter-spacing: -.035em; }
.section-index { display: flex; align-items: center; gap: 12px; margin-bottom: 36px; color: var(--steel); font-family: Consolas, monospace; font-size: 11px; letter-spacing: .12em; }
.section-index span { color: var(--orange); font-size: 14px; }
.section-index i { width: 64px; height: 1px; background: var(--line); }
.section-index b { font-weight: 400; }

.site-header {
  position: fixed; inset: 0 0 auto; z-index: 50; height: 82px; padding: 0 48px;
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid rgba(233,229,218,.12); transition: background .25s, height .25s;
}
.site-header.is-scrolled { height: 70px; background: rgba(10,12,12,.92); backdrop-filter: blur(14px); }
.brand { display: flex; align-items: center; gap: 13px; min-width: 270px; }
.brand-mark { width: 42px; height: 42px; flex: none; }
.brand-mark circle { fill: none; stroke: var(--paper); stroke-width: 2.5; }
.brand-mark path { fill: none; stroke: var(--orange); stroke-width: 3.5; stroke-linecap: round; }
.brand strong { display: block; font-size: 16px; letter-spacing: .08em; }
.brand small { display: block; color: var(--steel); font-size: 8px; letter-spacing: .12em; }
.site-nav { display: flex; align-items: center; gap: clamp(20px, 2.2vw, 42px); font-size: 13px; }
.site-nav a { position: relative; padding: 8px 0; color: rgba(233,229,218,.78); }
.site-nav a::after { content: ""; position: absolute; left: 0; bottom: 2px; width: 0; height: 1px; background: var(--orange); transition: width .2s; }
.site-nav a:hover::after, .site-nav a:focus-visible::after { width: 100%; }
.site-nav .nav-contact { padding: 11px 17px; border: 1px solid rgba(227,111,45,.65); color: var(--paper); }
.site-nav .nav-contact::after { display: none; }
.menu-toggle { display: none; color: var(--paper); border: 0; background: transparent; }

.hero { position: relative; min-height: 920px; height: 100svh; overflow: hidden; }
.hero-image { position: absolute; inset: 0; height: 100%; object-fit: cover; object-position: 63% center; }
.hero-shade { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(10,12,12,.98) 0%, rgba(10,12,12,.84) 31%, rgba(10,12,12,.2) 68%, rgba(10,12,12,.38) 100%), linear-gradient(0deg, rgba(10,12,12,.82), transparent 35%); }
.hero-copy { position: relative; z-index: 2; width: min(670px, 44vw); margin-left: max(48px, calc((100vw - 1480px)/2)); padding-top: clamp(190px, 24vh, 270px); }
.hero h1 { margin-bottom: 30px; font-family: "Songti SC", "STSong", serif; font-size: clamp(72px, 7.6vw, 132px); letter-spacing: -.06em; }
.hero-lede { width: min(520px, 100%); color: rgba(233,229,218,.72); font-size: 18px; }
.hero-actions { display: flex; align-items: center; gap: 32px; margin-top: 48px; }
.button { display: inline-flex; justify-content: center; align-items: center; min-height: 52px; padding: 0 25px; border: 0; cursor: pointer; letter-spacing: .08em; }
.button-primary { background: var(--orange); color: #fff; }
.button-primary:hover, .button-primary:focus-visible { background: #f07b37; }
.text-link { padding-bottom: 5px; border-bottom: 1px solid var(--line); }
.text-link span { margin-left: 15px; color: var(--orange); }
.hero-axis { position: absolute; z-index: 2; right: 48px; bottom: 90px; display: grid; grid-template-columns: auto 160px auto; align-items: center; gap: 12px; color: var(--steel); font: 9px Consolas, monospace; letter-spacing: .18em; }
.hero-axis i { position: relative; height: 1px; background: var(--orange); }
.hero-axis i::after { content: ""; position: absolute; right: 0; top: -3px; width: 7px; height: 7px; border-top: 1px solid var(--orange); border-right: 1px solid var(--orange); transform: rotate(45deg); }
.scroll-cue { position: absolute; z-index: 2; left: 48px; bottom: 58px; display: flex; align-items: center; gap: 14px; color: var(--steel); font-size: 11px; letter-spacing: .14em; }
.scroll-cue i { display: block; width: 70px; height: 1px; background: var(--line); }

.intro { position: relative; padding: 150px 0 135px; display: grid; grid-template-columns: 160px minmax(0, 1.1fr) minmax(300px, .9fr); gap: 48px; }
.intro .section-index { align-self: start; }
.intro h2 { max-width: 760px; }
.intro-copy { padding-top: 74px; color: rgba(233,229,218,.66); font-size: 16px; }
.intro-copy p:first-child { color: var(--paper); font-family: "Songti SC", serif; font-size: 24px; }
.intro-line { position: absolute; bottom: 58px; left: 160px; right: 0; display: grid; grid-template-columns: 1fr 1fr 1fr; align-items: center; }
.intro-line::before { content: ""; position: absolute; left: 0; right: 0; height: 1px; background: var(--line); }
.intro-line span { z-index: 1; width: 8px; height: 8px; border: 2px solid var(--orange); border-radius: 50%; background: var(--ink); }
.intro-line span:nth-child(2) { justify-self: center; }
.intro-line span:nth-child(3) { justify-self: end; }

.products { border-top: 1px solid var(--line); }
.section-lead { padding: 130px 0 90px; display: grid; grid-template-columns: 160px 1fr 1fr; column-gap: 48px; }
.section-lead .section-index { grid-row: 1 / 4; }
.section-lead .eyebrow { grid-column: 2 / 4; }
.section-lead h2 { grid-column: 2 / 4; max-width: 980px; }
.section-lead > p:last-child { grid-column: 3; color: var(--steel); }
.product-lane { min-height: 620px; display: grid; grid-template-columns: 9vw 30vw minmax(0, 1fr); align-items: stretch; border-top: 1px solid var(--line); overflow: hidden; }
.product-number { display: grid; place-items: center; border-right: 1px solid var(--line); font: 700 clamp(52px, 6vw, 92px) Consolas, monospace; writing-mode: vertical-rl; transform: rotate(180deg); opacity: .82; }
.product-lane-orange .product-number { color: var(--orange); }
.product-lane-green .product-number { color: var(--green); }
.product-lane-light .product-number { color: var(--paper); }
.product-copy { align-self: center; padding: 70px 5vw; }
.product-en { margin-bottom: 14px; color: var(--steel); font: 11px Consolas, monospace; letter-spacing: .2em; }
.product-copy h3 { margin-bottom: 25px; font-family: "Songti SC", serif; font-size: clamp(48px, 5vw, 78px); }
.product-copy > p:not(.product-en) { color: var(--steel); }
.inline-list { display: flex; flex-wrap: wrap; gap: 7px 20px; margin: 34px 0; padding: 0; list-style: none; }
.inline-list li { position: relative; padding-left: 12px; font-size: 13px; }
.inline-list li::before { content: ""; position: absolute; left: 0; top: .75em; width: 4px; height: 4px; background: var(--orange); }
.product-copy a { display: inline-flex; gap: 22px; padding-bottom: 7px; border-bottom: 1px solid var(--line); font-size: 13px; }
.product-copy a span { color: var(--orange); }
.product-lane figure { position: relative; min-height: 620px; margin: 0; overflow: hidden; background: var(--panel); }
.product-lane figure::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(10,12,12,.32), transparent 30%); pointer-events: none; }
.product-lane figure img { height: 100%; object-fit: cover; transition: transform .8s cubic-bezier(.2,.7,.2,1); }
.product-lane:hover figure img { transform: scale(1.025); }
.product-lane figcaption { position: absolute; z-index: 2; right: 30px; bottom: 22px; color: rgba(233,229,218,.55); font-size: 10px; letter-spacing: .1em; }

.applications { position: relative; min-height: 820px; overflow: hidden; }
.applications > img { position: absolute; inset: 0; height: 100%; object-fit: cover; }
.applications-shade { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(10,12,12,.97) 0%, rgba(10,12,12,.7) 48%, rgba(10,12,12,.22)), linear-gradient(0deg, rgba(10,12,12,.85), transparent 48%); }
.applications-content { position: relative; z-index: 2; padding-top: 125px; }
.applications-content h2 { max-width: 760px; }
.applications-content > p:not(.eyebrow) { max-width: 610px; color: rgba(233,229,218,.7); }
.application-route { position: absolute; top: 590px; left: 0; right: 0; display: grid; grid-template-columns: repeat(6, 1fr); margin: 0; padding: 0; list-style: none; border-top: 1px solid rgba(233,229,218,.32); }
.application-route::before { content: ""; position: absolute; top: -1px; left: 0; width: 40%; height: 1px; background: var(--orange); }
.application-route li { position: relative; display: flex; gap: 10px; padding-top: 22px; color: rgba(233,229,218,.8); font-size: 13px; }
.application-route li::before { content: ""; position: absolute; top: -4px; left: 0; width: 7px; height: 7px; background: var(--orange); transform: rotate(45deg); }
.application-route b { color: var(--orange); font: 10px Consolas, monospace; }

.manufacturing { padding: 140px 0 160px; }
.manufacturing-lead { display: grid; grid-template-columns: 1.1fr .9fr; gap: 80px; align-items: end; margin-left: 160px; }
.manufacturing-lead .eyebrow, .manufacturing-lead h2 { grid-column: 1; }
.manufacturing-lead h2 { margin-bottom: 0; }
.manufacturing-lead > p:last-child { grid-column: 2; grid-row: 1 / 3; align-self: end; color: var(--steel); }
.process-scroll { margin-top: 90px; }
.process-step { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(280px, .65fr); min-height: 520px; border-top: 1px solid var(--line); }
.process-step figure { margin: 0; overflow: hidden; }
.process-step figure img { height: 100%; object-fit: cover; }
.process-step > div { display: flex; flex-direction: column; justify-content: center; padding: 60px; border-left: 1px solid var(--line); }
.process-step > div > span { color: var(--orange); font: 10px Consolas, monospace; letter-spacing: .18em; }
.process-step h3 { margin: 18px 0; font-family: "Songti SC", serif; font-size: 56px; }
.process-step p { color: var(--steel); }
.process-step-test { grid-template-columns: minmax(280px, .65fr) minmax(0, 1.35fr); }
.process-step-test figure { grid-column: 2; grid-row: 1; }
.process-step-test > div { grid-column: 1; grid-row: 1; border-left: 0; border-right: 1px solid var(--line); }
.process-bridge { height: 120px; display: grid; grid-template-columns: 120px 1fr auto; align-items: center; gap: 20px; color: var(--steel); font: 10px Consolas, monospace; letter-spacing: .1em; }
.process-bridge span { height: 1px; background: var(--orange); }
.process-bridge i { height: 1px; background: var(--line); }
.process-bridge b { font-weight: 400; }

.development { min-height: 900px; display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(520px, .85fr); background: #111413; }
.development-image { min-height: 900px; overflow: hidden; }
.development-image img { height: 100%; object-fit: cover; }
.development-copy { padding: 110px 7vw; }
.timeline { margin: 65px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.timeline li { display: grid; grid-template-columns: 100px 1fr; gap: 24px; padding: 26px 0; border-bottom: 1px solid var(--line); }
.timeline time { color: var(--orange); font: 20px Consolas, monospace; }
.timeline h3 { margin-bottom: 8px; font-size: 20px; }
.timeline p { margin-bottom: 0; color: var(--steel); font-size: 13px; }

.contact { padding: 150px 0 120px; display: grid; grid-template-columns: 160px .8fr 1.1fr; column-gap: 48px; }
.contact .section-index { grid-row: 1 / 3; }
.contact-heading { padding-right: 30px; }
.contact-heading p:last-child { color: var(--steel); }
.contact-directory { margin-top: 40px; border-top: 1px solid var(--line); }
.contact-directory article { display: grid; grid-template-columns: 1.1fr .9fr 1.25fr; gap: 16px; padding: 17px 0; border-bottom: 1px solid var(--line); font-size: 12px; }
.contact-directory article span { color: var(--steel); }
.contact-directory article a:hover { color: var(--orange); }
.contact-directory address { padding-top: 22px; color: var(--steel); font-style: normal; font-size: 12px; }
.inquiry-form { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; align-content: start; padding: 45px; background: var(--panel); }
.inquiry-form label { display: grid; gap: 8px; }
.inquiry-form label span { color: var(--steel); font-size: 11px; letter-spacing: .1em; }
.inquiry-form input, .inquiry-form select, .inquiry-form textarea { width: 100%; padding: 13px 0; color: var(--paper); border: 0; border-bottom: 1px solid rgba(233,229,218,.28); border-radius: 0; outline: none; background: transparent; }
.inquiry-form select option { color: var(--ink); }
.inquiry-form input:focus, .inquiry-form select:focus, .inquiry-form textarea:focus { border-bottom-color: var(--orange); }
.form-message, .form-status { grid-column: 1 / -1; }
.inquiry-form .button { justify-self: start; }
.form-status { min-height: 24px; margin: 0; color: var(--orange); font-size: 12px; }

.site-footer { position: relative; display: grid; grid-template-columns: 1.2fr 1fr auto; align-items: center; gap: 48px; padding: 50px 48px; border-top: 1px solid var(--line); }
.footer-brand { display: flex; align-items: center; gap: 18px; }
.footer-brand strong { display: block; font-size: 14px; }
.footer-brand span { display: block; color: var(--steel); font-size: 10px; letter-spacing: .08em; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 12px 24px; color: var(--steel); font-size: 11px; }
.visual-note { margin: 0; color: rgba(154,163,157,.7); font-size: 10px; white-space: nowrap; }
.back-top { position: absolute; right: 18px; top: 18px; display: grid; place-items: center; width: 28px; height: 28px; color: var(--orange); border: 1px solid var(--line); }

@media (max-width: 1100px) {
  :root { --page: calc(100vw - 56px); }
  .site-header { padding-inline: 28px; }
  .site-nav { gap: 18px; }
  .hero-copy { margin-left: 28px; width: 54vw; }
  .intro, .section-lead, .contact { grid-template-columns: 110px 1fr; }
  .intro-copy { grid-column: 2; padding-top: 0; max-width: 680px; }
  .section-lead > p:last-child { grid-column: 2; }
  .product-lane { grid-template-columns: 82px 34vw minmax(0, 1fr); }
  .manufacturing-lead { margin-left: 110px; }
  .development { grid-template-columns: 1fr 1fr; }
  .contact-heading, .contact-directory { grid-column: 2; }
  .inquiry-form { grid-column: 2; margin-top: 60px; }
  .site-footer { grid-template-columns: 1fr 1fr; }
  .visual-note { grid-column: 2; }
}

@media (max-width: 900px) {
  :root { --page: calc(100vw - 40px); }
  h2 { font-size: clamp(40px, 11vw, 62px); }
  .site-header { height: 68px; padding-inline: 20px; background: rgba(10,12,12,.9); }
  .brand { min-width: 0; }
  .brand-mark { width: 36px; height: 36px; }
  .brand small { display: none; }
  .menu-toggle { position: relative; z-index: 52; display: grid; grid-template-columns: 24px auto; grid-template-rows: repeat(3, 5px); column-gap: 10px; align-items: center; padding: 8px 0; }
  .menu-toggle span { width: 24px; height: 1px; background: currentColor; transition: transform .2s, opacity .2s; }
  .menu-toggle b { grid-column: 2; grid-row: 1 / 4; font-size: 11px; font-weight: 400; }
  .menu-open .menu-toggle span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
  .menu-open .menu-toggle span:nth-child(2) { opacity: 0; }
  .menu-open .menu-toggle span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }
  .site-nav { position: fixed; inset: 0; z-index: 51; display: flex; flex-direction: column; justify-content: center; align-items: flex-start; gap: 0; padding: 80px 12vw; visibility: hidden; opacity: 0; transform: translateY(-12px); background: var(--ink); transition: opacity .2s, transform .2s, visibility .2s; }
  .menu-open .site-nav { visibility: visible; opacity: 1; transform: none; }
  .site-nav a, .site-nav .nav-contact { width: 100%; padding: 16px 0; border: 0; border-bottom: 1px solid var(--line); font-family: "Songti SC", serif; font-size: 30px; }
  .hero { min-height: 760px; height: 100svh; }
  .hero-image { object-position: 58% center; }
  .hero-shade { background: linear-gradient(0deg, rgba(10,12,12,.98) 0%, rgba(10,12,12,.8) 48%, rgba(10,12,12,.16) 100%); }
  .hero-copy { position: absolute; left: 20px; right: 20px; bottom: 80px; width: auto; margin: 0; padding: 0; }
  .hero h1 { font-size: clamp(58px, 16.5vw, 88px); }
  .hero-lede { font-size: 15px; }
  .hero-axis { display: none; }
  .scroll-cue { left: auto; right: 20px; bottom: 30px; }
  .intro, .section-lead, .contact { display: block; padding: 95px 0; }
  .intro .section-index, .section-lead .section-index, .contact .section-index { margin-bottom: 52px; }
  .intro-copy { padding: 22px 0 0; }
  .intro-line { left: 0; bottom: 42px; }
  .section-lead > p:last-child { max-width: 560px; }
  .product-lane { min-height: 0; display: grid; grid-template-columns: 64px 1fr; }
  .product-number { grid-row: 1 / 3; }
  .product-copy { padding: 58px 26px; }
  .product-lane figure { grid-column: 2; min-height: 400px; }
  .applications { min-height: 940px; }
  .applications-content { padding-top: 95px; }
  .application-route { top: 570px; grid-template-columns: 1fr 1fr; border-top: 0; }
  .application-route li { padding: 18px 0; border-top: 1px solid rgba(233,229,218,.25); }
  .application-route::before { display: none; }
  .manufacturing { padding: 100px 0; }
  .manufacturing-lead { display: block; margin-left: 0; }
  .process-step, .process-step-test { display: flex; flex-direction: column; min-height: 0; }
  .process-step figure, .process-step-test figure { min-height: 380px; order: 0; }
  .process-step > div, .process-step-test > div { order: 1; padding: 44px 0; border: 0; }
  .process-bridge { grid-template-columns: 70px 1fr; }
  .process-bridge b { grid-column: 1 / -1; }
  .development { display: flex; flex-direction: column; min-height: 0; }
  .development-image { min-height: 520px; }
  .development-copy { padding: 90px 20px; }
  .contact-heading, .contact-directory, .inquiry-form { margin-top: 0; }
  .contact-directory { margin-bottom: 65px; }
  .inquiry-form { padding: 34px 24px; }
  .site-footer { grid-template-columns: 1fr; padding: 42px 20px; }
  .visual-note { grid-column: 1; }
}

@media (max-width: 540px) {
  .brand strong { font-size: 14px; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 18px; margin-top: 34px; }
  .product-lane { grid-template-columns: 48px minmax(0, 1fr); }
  .product-copy { padding: 46px 20px; }
  .product-copy h3 { font-size: 46px; }
  .product-lane figure { min-height: 290px; }
  .product-lane figcaption { right: 16px; bottom: 12px; }
  .applications-content > p:not(.eyebrow) { font-size: 14px; }
  .application-route { top: 620px; }
  .manufacturing-lead > p:last-child { font-size: 14px; }
  .process-step figure, .process-step-test figure { min-height: 250px; }
  .process-step h3 { font-size: 46px; }
  .development-image { min-height: 330px; }
  .development-copy { padding-inline: 20px; }
  .timeline li { grid-template-columns: 76px 1fr; }
  .contact-directory article { grid-template-columns: 1fr; gap: 4px; }
  .inquiry-form { grid-template-columns: 1fr; }
  .inquiry-form label, .form-message, .form-status { grid-column: 1; }
  .site-footer nav { display: grid; grid-template-columns: 1fr 1fr; }
}

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