:root {
  --paper: #f1f0e8;
  --paper-deep: #e4e2d6;
  --ink: #101b17;
  --green: #17392b;
  --green-2: #24533f;
  --lime: #b8d04f;
  --copper: #95502d;
  --gray: #5b6058;
  --line: rgba(16, 27, 23, .22);
  --max: 1280px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Noto Sans SC", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.65;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 50;
  opacity: .045;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180' viewBox='0 0 180 180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.75' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.55'/%3E%3C/svg%3E");
}
img { display: block; max-width: 100%; }
a { color: inherit; }
button, input, textarea { font: inherit; }
.wrap { width: min(var(--max), calc(100% - 96px)); margin-inline: auto; }
.skip-link { position: fixed; top: 8px; left: 8px; z-index: 100; padding: 10px 16px; background: var(--lime); color: var(--ink); transform: translateY(-160%); }
.skip-link:focus { transform: none; }

.site-header {
  position: fixed;
  z-index: 40;
  top: 0;
  left: 0;
  width: 100%;
  height: 82px;
  display: flex;
  align-items: center;
  gap: 36px;
  padding: 0 40px;
  color: #fff;
  background: linear-gradient(to bottom, rgba(9, 20, 15, .82), rgba(9, 20, 15, 0));
  transition: background .25s ease, color .25s ease, height .25s ease;
}
.site-header.is-scrolled { height: 70px; color: var(--ink); background: rgba(241, 240, 232, .94); backdrop-filter: blur(14px); border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; min-width: 250px; }
.brand-mark { width: 46px; height: 34px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: square; stroke-linejoin: miter; }
.brand span { display: grid; line-height: 1.1; }
.brand strong { font-size: 16px; letter-spacing: .08em; }
.brand small { margin-top: 5px; font: 9px/1.2 Consolas, monospace; letter-spacing: .18em; opacity: .68; }
.site-nav { margin-left: auto; display: flex; align-items: center; gap: 30px; }
.site-nav a { position: relative; font-size: 13px; text-decoration: none; letter-spacing: .08em; }
.site-nav a:not(.nav-contact)::after { content: ""; position: absolute; left: 0; bottom: -7px; width: 100%; height: 1px; background: currentColor; transform: scaleX(0); transform-origin: right; transition: transform .25s ease; }
.site-nav a:hover::after, .site-nav a:focus-visible::after { transform: scaleX(1); transform-origin: left; }
.nav-contact { padding: 10px 17px; border: 1px solid currentColor; }
.menu-toggle { display: none; }

.hero { position: relative; min-height: 100svh; color: white; background: var(--green); overflow: hidden; }
.hero > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center; }
.hero-shade { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(7, 18, 13, .79) 0%, rgba(7, 18, 13, .45) 43%, rgba(7, 18, 13, .07) 72%), linear-gradient(0deg, rgba(7, 18, 13, .55), transparent 42%); }
.hero-contours { position: absolute; width: 46vw; height: 46vw; left: -8vw; top: 10vh; border: 1px solid rgba(255,255,255,.18); border-radius: 46% 54% 41% 59%; transform: rotate(-9deg); }
.hero-contours::before, .hero-contours::after { content: ""; position: absolute; inset: 7%; border: 1px solid rgba(255,255,255,.14); border-radius: 54% 46% 58% 42%; }
.hero-contours::after { inset: 16%; border-radius: 42% 58% 50% 50%; }
.hero-copy { position: relative; z-index: 2; min-height: 100svh; display: flex; flex-direction: column; justify-content: center; width: min(1350px, calc(100% - 96px)); margin: 0 auto; padding-top: 110px; }
.eyebrow { font: 11px/1.4 Consolas, monospace; letter-spacing: .28em; color: var(--lime); }
.hero h1 { margin: 24px 0 50px; max-width: 980px; font-family: "Microsoft YaHei UI", sans-serif; font-size: clamp(56px, 7.1vw, 112px); line-height: .98; letter-spacing: -.07em; font-weight: 800; }
.hero h1 span { display: block; }
.hero-foot { display: grid; grid-template-columns: 1fr 1fr auto; align-items: end; width: min(850px, 100%); padding-top: 22px; border-top: 1px solid rgba(255,255,255,.45); }
.hero-foot p, .hero-foot a { margin: 0; font-size: 13px; text-decoration: none; }
.hero-foot a { color: var(--lime); }

.paper-section { position: relative; background: var(--paper); }
.section-index { display: grid; grid-template-columns: 42px auto 1fr; align-items: center; gap: 18px; padding-top: 70px; font: 10px/1 Consolas, monospace; letter-spacing: .18em; color: var(--gray); }
.section-index span { color: var(--copper); font-size: 13px; }
.section-index p { margin: 0; }
.section-index i { height: 1px; background: var(--line); }
.section-index.light { color: rgba(255,255,255,.6); }
.section-index.light span { color: var(--lime); }
.section-index.light i { background: rgba(255,255,255,.25); }
.lead-note { margin: 0 0 22px; font: 11px/1.4 Consolas, monospace; letter-spacing: .24em; text-transform: uppercase; color: var(--green-2); }
.position { padding-bottom: 0; overflow: hidden; }
.position-copy { display: grid; grid-template-columns: 200px 1fr 360px; gap: 52px; align-items: end; padding: 100px 0 76px; }
.position-copy h2, .process-head h2, .quality-copy h2, .records-intro h2, .contact-intro h2 { margin: 0; font-size: clamp(38px, 5vw, 72px); line-height: 1.12; letter-spacing: -.055em; }
.position-copy > p:last-child, .process-head > p:last-child { margin: 0 0 8px; font-size: 16px; color: #4f554f; }
.strata-figure { width: min(1440px, calc(100% - 48px)); margin: 0 auto; }
.strata-figure img { width: 100%; aspect-ratio: 16/6.2; object-fit: cover; }
.strata-figure figcaption { display: flex; justify-content: space-between; padding: 14px 0 28px; border-bottom: 1px solid var(--line); font: 10px/1.4 Consolas, monospace; letter-spacing: .12em; color: var(--gray); }
.contour-line { position: absolute; width: 440px; height: 240px; right: -80px; top: 120px; border: 1px solid rgba(23,57,43,.11); border-radius: 58% 42% 49% 51%; transform: rotate(12deg); }
.contour-line::before, .contour-line::after { content: ""; position: absolute; inset: 12%; border: 1px solid rgba(23,57,43,.1); border-radius: 41% 59% 55% 45%; }
.contour-line::after { inset: 25%; }

.product { display: grid; grid-template-columns: 50% 50%; min-height: 880px; background: var(--green); color: white; }
.product-copy { width: auto; max-width: 670px; margin: 0 0 0 auto; padding: 0 70px 90px 48px; align-self: center; }
.product-copy h2 { margin: 64px 0 30px; font-size: clamp(50px, 5.6vw, 88px); line-height: 1; letter-spacing: -.06em; }
.product-copy h2 em { color: var(--lime); font: normal 700 .62em/1 Consolas, monospace; letter-spacing: -.02em; }
.product-copy .lead-note { color: var(--lime); }
.product-copy > p:not(.lead-note):not(.boundary-note) { max-width: 560px; color: rgba(255,255,255,.76); }
.product-image { margin: 0; min-height: 100%; }
.product-image img { width: 100%; height: 100%; object-fit: cover; }
.record-strip { display: grid; grid-template-columns: repeat(3, 1fr); margin: 56px 0 32px; padding: 20px 0; border-top: 1px solid rgba(255,255,255,.3); border-bottom: 1px solid rgba(255,255,255,.3); }
.record-strip div { padding-right: 16px; }
.record-strip dt { color: rgba(255,255,255,.55); font-size: 11px; }
.record-strip dd { margin: 8px 0 0; font-size: 18px; }
.boundary-note { margin: 0; font-size: 12px; color: rgba(255,255,255,.62); }

.process { padding: 0 0 120px; background: var(--paper); }
.process-head { display: grid; grid-template-columns: minmax(0, 1fr) 360px; column-gap: 80px; padding-bottom: 76px; }
.process-head .section-index { grid-column: 1 / -1; }
.process-head .lead-note { grid-column: 1 / -1; margin-top: 82px; }
.process-ribbon { width: min(1500px, calc(100% - 32px)); margin: 0 auto; }
.process-ribbon img { width: 100%; aspect-ratio: 16/7.3; object-fit: cover; }
.process-ribbon figcaption { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; margin-top: 1px; background: var(--line); }
.process-ribbon figcaption span { padding: 15px 20px; background: var(--paper); font-size: 12px; color: var(--gray); }
.heat-study { display: grid; grid-template-columns: 32% 68%; align-items: center; margin-top: 120px; }
.heat-copy { padding-right: 70px; }
.heat-copy h3 { margin: 0 0 32px; font-size: clamp(36px, 4vw, 60px); line-height: 1.1; letter-spacing: -.05em; }
.heat-copy > p:last-child { color: #555b55; }
.heat-image { margin: 0; }
.heat-image img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }

.quality { padding: 120px 0; }
.quality-grid { display: grid; grid-template-columns: 58% 42%; align-items: center; }
.quality-image { margin: 0; transform: translateX(-48px); }
.quality-image img { width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.quality-copy { padding-left: 40px; }
.quality-copy .section-index { padding-top: 0; }
.quality-copy .lead-note { margin-top: 72px; }
.quality-data { margin: 56px 0 0; border-top: 1px solid var(--line); }
.quality-data div { display: grid; grid-template-columns: 130px 1fr; padding: 15px 0; border-bottom: 1px solid var(--line); }
.quality-data dt { font-size: 12px; color: var(--gray); }
.quality-data dd { margin: 0; font-size: 14px; }

.application { position: relative; min-height: 850px; color: white; background: var(--ink); }
.application-image { position: absolute; inset: 0; margin: 0; }
.application-image::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(9,16,13,.08) 20%, rgba(9,16,13,.86) 66%, rgba(9,16,13,.96)); }
.application-image img { width: 100%; height: 100%; object-fit: cover; }
.application-copy { position: relative; z-index: 2; min-height: 850px; display: flex; flex-direction: column; justify-content: center; align-items: flex-start; padding-left: 56%; }
.application-copy .section-index { width: 100%; padding-top: 0; }
.application-copy .lead-note { margin-top: 80px; color: var(--lime); }
.application-copy h2 { margin: 0 0 32px; font-size: clamp(42px, 5vw, 72px); line-height: 1.08; letter-spacing: -.055em; }
.application-copy > p:not(.lead-note) { color: rgba(255,255,255,.72); max-width: 560px; }
.text-link { display: inline-flex; gap: 24px; margin-top: 34px; padding-bottom: 8px; color: var(--lime); text-decoration: none; border-bottom: 1px solid currentColor; }

.records { position: relative; background: var(--paper); padding-bottom: 120px; }
.records-image { margin: 0; }
.records-image img { width: 100%; aspect-ratio: 16/7.2; object-fit: cover; }
.records-panel { display: grid; grid-template-columns: 38% 62%; margin-top: -80px; position: relative; z-index: 2; background: var(--paper); padding: 0 64px 0 0; }
.records-intro { padding-right: 70px; }
.records-intro .section-index { padding-top: 50px; }
.records-intro .lead-note { margin-top: 80px; }
.timeline { border-left: 1px solid var(--line); }
.timeline article { position: relative; padding: 48px 20px 48px 60px; border-bottom: 1px solid var(--line); }
.timeline article::before { content: ""; position: absolute; width: 9px; height: 9px; border: 2px solid var(--green); background: var(--paper); left: -6px; top: 57px; }
.timeline article:first-child::before { background: var(--lime); }
.timeline time { font: 11px/1.2 Consolas, monospace; color: var(--copper); letter-spacing: .12em; }
.timeline h3 { margin: 12px 0 8px; font-size: 25px; }
.timeline p { margin: 0; color: #555b55; }
.timeline .boundary-note { margin-top: 12px; color: var(--gray); }

.contact { padding: 20px 0 100px; }
.contact-intro { padding-bottom: 70px; }
.contact-intro .lead-note { margin-top: 82px; }
.address-line { display: grid; grid-template-columns: 120px 1fr; max-width: 720px; margin-top: 58px; padding: 18px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.address-line span { font-size: 12px; color: var(--gray); }
.address-line p { margin: 0; }
.contact-form { display: grid; grid-template-columns: repeat(3, 1fr); column-gap: 30px; row-gap: 30px; padding-top: 38px; border-top: 2px solid var(--green); }
.contact-form label { display: grid; gap: 8px; }
.contact-form label span { font-size: 12px; color: var(--gray); }
.contact-form input, .contact-form textarea { width: 100%; border: 0; border-bottom: 1px solid var(--line); border-radius: 0; background: transparent; color: var(--ink); padding: 10px 0; outline: none; }
.contact-form input:focus, .contact-form textarea:focus { border-bottom-color: var(--green); box-shadow: 0 2px 0 var(--green); }
.message-field { grid-column: 1 / -1; }
.form-actions { grid-column: 1 / -1; display: flex; align-items: center; gap: 24px; }
.form-actions button { cursor: pointer; border: 0; background: var(--green); color: white; padding: 14px 22px; }
.form-actions button:hover, .form-actions button:focus-visible { background: var(--green-2); }
.form-actions p { margin: 0; color: var(--gray); font-size: 12px; }
.form-status { grid-column: 1 / -1; min-height: 1.7em; margin: 0; color: #7c3a19; font-weight: 700; }

.site-footer { display: grid; grid-template-columns: 1fr auto auto; align-items: center; gap: 40px; min-height: 160px; padding: 32px 48px; background: var(--ink); color: white; }
.footer-brand { min-width: 0; }
.site-footer > p { margin: 0; font-size: 11px; color: rgba(255,255,255,.58); }

.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-visible { opacity: 1; transform: none; }
:focus-visible { outline: 3px solid var(--lime); outline-offset: 4px; }

@media (max-width: 1080px) {
  .wrap { width: min(var(--max), calc(100% - 56px)); }
  .site-header { padding-inline: 28px; }
  .site-nav { gap: 20px; }
  .position-copy { grid-template-columns: 120px 1fr; }
  .position-copy > p:last-child { grid-column: 2; }
  .product { min-height: 760px; }
  .product-copy { padding-left: 28px; padding-right: 42px; }
  .records-panel { grid-template-columns: 45% 55%; padding-right: 36px; }
}

@media (max-width: 820px) {
  .site-header { height: 68px; padding: 0 20px; color: var(--ink); background: rgba(241,240,232,.95); border-bottom: 1px solid var(--line); }
  .site-header.is-scrolled { height: 68px; }
  .brand { min-width: 0; }
  .brand, .hero-foot a, .text-link, .footer-brand { min-height: 44px; align-items: center; }
  .brand strong { font-size: 14px; }
  .brand small { display: none; }
  .brand-mark { width: 38px; }
  .menu-toggle { margin-left: auto; display: inline-flex; width: 52px; height: 44px; padding: 11px; border: 0; background: transparent; flex-direction: column; justify-content: center; gap: 5px; color: inherit; }
  .menu-toggle span { display: block; width: 100%; height: 1px; background: currentColor; }
  .menu-toggle b { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
  .site-nav { position: fixed; inset: 68px 0 auto; display: grid; gap: 0; padding: 12px 20px 28px; background: var(--paper); color: var(--ink); border-bottom: 1px solid var(--line); transform: translateY(-130%); opacity: 0; visibility: hidden; pointer-events: none; transition: transform .25s ease, opacity .25s ease; }
  .site-nav.is-open { transform: none; opacity: 1; visibility: visible; pointer-events: auto; transition-delay: 0s; }
  .site-nav a { padding: 14px 0; border-bottom: 1px solid var(--line); }
  .nav-contact { border: 0; }
  .hero-copy { width: calc(100% - 40px); padding-top: 90px; justify-content: flex-end; padding-bottom: 40px; }
  .hero { min-height: 780px; }
  .hero h1 { font-size: clamp(48px, 14vw, 72px); margin-bottom: 34px; }
  .hero-foot { grid-template-columns: 1fr; gap: 8px; }
  .hero-foot a { margin-top: 16px; }
  .wrap { width: calc(100% - 40px); }
  .section-index { padding-top: 50px; }
  .position-copy { display: block; padding: 70px 0 50px; }
  .position-copy h2 { margin-bottom: 26px; }
  .position-copy > p:last-child { margin-top: 28px; }
  .strata-figure { width: calc(100% - 20px); }
  .strata-figure img { aspect-ratio: 4/3; }
  .product { display: flex; flex-direction: column; min-height: 0; }
  .product-copy { order: 2; max-width: none; margin: 0; padding: 0 20px 70px; }
  .product-image { order: 1; min-height: 420px; }
  .product-image img { min-height: 420px; }
  .product-copy h2 { margin-top: 50px; }
  .record-strip { margin-top: 40px; }
  .process-head { display: block; padding-bottom: 48px; }
  .process-head .lead-note { margin-top: 60px; }
  .process-head > p:last-child { margin-top: 28px; }
  .process-ribbon { width: calc(100% - 20px); }
  .process-ribbon img { aspect-ratio: 4/3; object-position: center; }
  .heat-study { display: flex; flex-direction: column; margin-top: 80px; }
  .heat-copy { padding: 0 0 36px; }
  .heat-image { width: 100%; }
  .quality { padding: 80px 0; }
  .quality-grid { display: flex; flex-direction: column; }
  .quality-image { transform: none; width: 100%; }
  .quality-copy { padding: 0; }
  .quality-copy .section-index { padding-top: 56px; }
  .quality-copy .lead-note { margin-top: 54px; }
  .application { min-height: 760px; }
  .application-image::after { background: linear-gradient(0deg, rgba(9,16,13,.97), rgba(9,16,13,.14) 70%); }
  .application-copy { min-height: 760px; justify-content: flex-end; padding: 0 0 60px; }
  .application-copy .section-index { padding-top: 0; }
  .application-copy .lead-note { margin-top: 50px; }
  .records-image img { aspect-ratio: 4/3; }
  .records-panel { display: block; width: calc(100% - 20px); margin-top: -30px; padding: 0 20px 0 0; }
  .records-intro { padding: 0 0 54px 20px; }
  .records-intro .lead-note { margin-top: 55px; }
  .timeline { margin-left: 20px; }
  .timeline article { padding-left: 38px; }
  .contact { padding-bottom: 70px; }
  .contact-intro .lead-note { margin-top: 58px; }
  .contact-form { grid-template-columns: 1fr; }
  .message-field, .form-actions, .form-status { grid-column: 1; }
  .site-footer { grid-template-columns: 1fr; gap: 18px; padding: 40px 20px; }
}

@media (max-width: 480px) {
  .hero { min-height: 720px; }
  .hero h1 { letter-spacing: -.08em; }
  .section-index { grid-template-columns: 32px auto 1fr; gap: 12px; }
  .position-copy h2, .process-head h2, .quality-copy h2, .records-intro h2, .contact-intro h2, .application-copy h2 { font-size: 38px; }
  .product-copy h2 { font-size: 48px; }
  .record-strip { grid-template-columns: 1fr; }
  .record-strip div { display: flex; justify-content: space-between; padding: 8px 0; }
  .record-strip dd { margin: 0; }
  .process-ribbon figcaption { grid-template-columns: repeat(2, 1fr); }
  .quality-data div { grid-template-columns: 100px 1fr; }
  .address-line { grid-template-columns: 1fr; gap: 6px; }
}

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