:root {
  --bone: #f3f0e8;
  --paper: #fbfaf6;
  --ink: #101211;
  --muted: #696d67;
  --algae: #315a4a;
  --mint: #b9e2cf;
  --crimson: #a43a45;
  --line: rgba(16, 18, 17, .2);
  --max: 1440px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--bone); font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif; overflow-x: hidden; }
body.menu-open { overflow: hidden; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 1000; background: var(--paper); padding: .75rem 1rem; }
.skip-link:focus { top: 1rem; }

.site-header { position: absolute; z-index: 20; inset: 0 0 auto; height: 92px; display: flex; align-items: center; justify-content: space-between; padding: 0 clamp(24px, 4vw, 68px); color: var(--paper); border-bottom: 1px solid rgba(255,255,255,.25); }
.brand { display: inline-flex; align-items: center; gap: 12px; }
.brand-mark { width: 48px; height: 38px; fill: none; stroke: currentColor; stroke-width: 3; stroke-linecap: round; }
.brand-mark circle { fill: currentColor; stroke: none; }
.brand-mark .flow { stroke: var(--mint); }
.brand span { display: grid; gap: 3px; }
.brand b { font-size: 16px; letter-spacing: .14em; }
.brand small { font-size: 10px; opacity: .68; letter-spacing: .16em; }
.site-nav { display: flex; align-items: center; gap: clamp(18px, 2.4vw, 40px); font-size: 13px; letter-spacing: .08em; }
.site-nav a { position: relative; padding: 10px 0; }
.site-nav a:not(.nav-contact)::after { content: ""; position: absolute; height: 1px; left: 0; right: 100%; bottom: 4px; background: currentColor; transition: right .25s ease; }
.site-nav a:hover::after, .site-nav a:focus-visible::after { right: 0; }
.nav-contact { border: 1px solid rgba(255,255,255,.6); padding: 12px 18px !important; }
.menu-toggle { display: none; border: 0; background: transparent; width: 44px; height: 44px; padding: 0; color: inherit; }
.menu-toggle span { display: block; width: 25px; height: 1px; background: currentColor; margin: 7px auto; transition: transform .25s; }

.hero { position: relative; min-height: 880px; height: 100vh; max-height: 1080px; color: var(--paper); overflow: hidden; }
.hero > img { width: 100%; height: 100%; object-fit: cover; object-position: center; }
.hero-wash { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(10,13,11,.9) 0%, rgba(10,13,11,.62) 40%, rgba(10,13,11,.06) 72%), linear-gradient(0deg, rgba(10,13,11,.55), transparent 45%); }
.hero-copy { position: absolute; left: clamp(24px, 7vw, 110px); top: 50%; transform: translateY(-45%); width: min(690px, 61vw); }
.eyebrow, .section-number { margin: 0 0 32px; font-size: 11px; line-height: 1.4; font-weight: 700; letter-spacing: .24em; text-transform: uppercase; }
.eyebrow::before, .section-number::before { content: ""; display: inline-block; width: 44px; height: 2px; margin: 0 14px 3px 0; background: var(--crimson); }
.hero h1 { margin: 0; font-family: Georgia, "Songti SC", serif; font-weight: 400; font-size: clamp(68px, 7.3vw, 120px); line-height: .9; letter-spacing: -.07em; }
.hero h1 em { color: var(--mint); font-weight: 400; }
.hero-lead { max-width: 520px; margin: 34px 0 0; font-size: 17px; line-height: 1.9; color: rgba(255,255,255,.78); }
.hero-actions { display: flex; align-items: center; gap: 32px; margin-top: 34px; }
.primary-link { display: inline-flex; align-items: center; justify-content: space-between; gap: 50px; min-width: 250px; padding: 17px 20px; background: var(--paper); color: var(--ink); font-size: 13px; letter-spacing: .08em; transition: background .2s, color .2s; }
.primary-link:hover { background: var(--mint); }
.primary-link.dark { background: var(--ink); color: var(--paper); }
.primary-link.dark:hover { background: var(--algae); }
.text-link { padding: 14px 0; border-bottom: 1px solid rgba(255,255,255,.5); font-size: 13px; }
.hero-index { position: absolute; left: clamp(24px, 4vw, 68px); right: clamp(24px, 4vw, 68px); bottom: 32px; display: flex; justify-content: space-between; font: 10px/1 monospace; letter-spacing: .16em; opacity: .65; }

.manifesto { max-width: var(--max); margin: auto; padding: 150px clamp(24px, 6vw, 96px) 0; display: grid; grid-template-columns: .95fr 1.05fr; column-gap: 8vw; }
.manifesto-heading h2, .development h2, .research-copy h2, .about-copy h2, .contact h2 { margin: 0; font-family: Georgia, "Songti SC", serif; font-size: clamp(46px, 5vw, 78px); line-height: 1.12; font-weight: 400; letter-spacing: -.05em; }
.manifesto-body { align-self: end; max-width: 500px; padding-bottom: 6px; }
.manifesto-body p { margin: 0 0 18px; line-height: 1.95; color: var(--muted); }
.manifesto-body .lead-copy { font-size: 24px; line-height: 1.55; color: var(--ink); }
.material-figure { grid-column: 1 / -1; margin: 90px 0 0; display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 20px; }
.material-figure img { grid-column: 1 / -1; width: 82%; margin-left: 18%; height: 610px; object-fit: cover; }
.material-figure figcaption { grid-column: 2; margin-top: -1px; font-size: 11px; letter-spacing: .15em; color: var(--muted); }

.direction-strip { max-width: 1760px; margin: 140px auto 0; display: grid; grid-template-columns: repeat(3, 1fr); background: var(--ink); }
.direction-panel { position: relative; min-height: 740px; overflow: hidden; color: white; border-right: 1px solid rgba(255,255,255,.28); }
.direction-panel:last-child { border-right: 0; }
.direction-panel img { width: 100%; height: 100%; object-fit: cover; filter: saturate(.85); transition: transform 1s cubic-bezier(.2,.7,.2,1); }
.direction-panel:hover img { transform: scale(1.025); }
.direction-panel::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(5,8,6,.86), rgba(5,8,6,.02) 58%); }
.direction-copy { position: absolute; z-index: 2; left: 32px; right: 32px; bottom: 38px; }
.direction-copy span { display: block; font: 11px monospace; margin-bottom: 18px; color: var(--mint); }
.direction-copy h3 { margin: 0 0 16px; font-family: Georgia, "Songti SC", serif; font-size: clamp(30px, 3vw, 48px); font-weight: 400; }
.direction-copy p { max-width: 410px; margin: 0; color: rgba(255,255,255,.72); line-height: 1.75; font-size: 14px; }

.manufacturing { position: relative; min-height: 940px; color: var(--paper); overflow: hidden; }
.manufacturing-bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.manufacturing-overlay { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(5,7,6,.93) 0%, rgba(5,7,6,.65) 47%, rgba(5,7,6,.03) 75%); }
.manufacturing-copy { position: relative; z-index: 2; max-width: 620px; padding: 150px 0 100px clamp(24px, 7vw, 112px); }
.section-number.light { color: rgba(255,255,255,.7); }
.manufacturing h2 { margin: 0 0 42px; font-family: Georgia, "Songti SC", serif; font-size: clamp(50px, 5.4vw, 86px); line-height: 1.03; font-weight: 400; letter-spacing: -.05em; }
.manufacturing-copy > p { max-width: 490px; line-height: 1.9; color: rgba(255,255,255,.73); }
.manufacturing dl { margin: 55px 0 20px; border-top: 1px solid rgba(255,255,255,.26); }
.manufacturing dl div { display: flex; justify-content: space-between; gap: 20px; padding: 20px 0; border-bottom: 1px solid rgba(255,255,255,.26); }
.manufacturing dt { color: rgba(255,255,255,.55); }
.manufacturing dd { margin: 0; }
.manufacturing small { color: rgba(255,255,255,.48); line-height: 1.7; }

.development { max-width: var(--max); margin: auto; padding: 150px clamp(24px, 6vw, 96px); }
.development-head { display: grid; grid-template-columns: .7fr 1.3fr; align-items: start; }
.development-head h2 { grid-column: 2; }
.timeline { position: relative; list-style: none; margin: 110px 0 0; padding: 0; display: grid; grid-template-columns: repeat(5, 1fr); }
.timeline::before { content: ""; position: absolute; top: 5px; left: 0; right: 0; height: 1px; background: var(--ink); }
.timeline li { position: relative; min-height: 260px; padding: 38px 24px 0 0; border-right: 1px solid var(--line); }
.timeline li:last-child { border-right: 0; padding-right: 0; }
.timeline li::before { content: ""; position: absolute; top: 0; left: 0; width: 11px; height: 11px; border-radius: 50%; background: var(--crimson); }
.timeline time { display: block; font: 12px monospace; color: var(--crimson); margin-bottom: 50px; }
.timeline b { display: block; margin-bottom: 13px; font-size: 17px; }
.timeline p { margin: 0; max-width: 205px; font-size: 13px; line-height: 1.8; color: var(--muted); }

.research-band { display: grid; grid-template-columns: 1.12fr .88fr; min-height: 820px; background: var(--paper); }
.research-image img { width: 100%; height: 100%; object-fit: cover; }
.research-image { margin: 0; min-height: 720px; }
.research-copy { padding: 120px clamp(32px, 7vw, 110px); align-self: center; }
.research-copy p:not(.section-number) { margin: 38px 0; max-width: 520px; line-height: 1.95; color: var(--muted); }

.about { position: relative; min-height: 880px; background: var(--ink); color: var(--paper); display: grid; align-items: end; overflow: hidden; }
.about-image { position: absolute; inset: 0; }
.about-image img { width: 100%; height: 100%; object-fit: cover; }
.about-image::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(8,11,9,.96) 0%, rgba(8,11,9,.42) 55%, rgba(8,11,9,.08)); }
.about-copy { position: relative; z-index: 2; display: grid; grid-template-columns: 1fr 1.4fr 1fr; gap: 50px; padding: 100px clamp(24px, 6vw, 96px); }
.about-copy h2 { grid-column: 2; }
.about-copy > p { margin: 0; line-height: 1.9; color: rgba(255,255,255,.73); align-self: end; }
.about-copy > p:last-child { grid-column: 3; }

.contact { max-width: var(--max); margin: auto; padding: 150px clamp(24px, 6vw, 96px); display: grid; grid-template-columns: .8fr 1.2fr; gap: 9vw; }
.contact-intro > p:not(.section-number) { max-width: 480px; line-height: 1.9; color: var(--muted); margin: 32px 0; }
.location-line { display: grid; gap: 8px; padding-top: 24px; border-top: 1px solid var(--line); }
.location-line span { font-size: 11px; letter-spacing: .16em; color: var(--muted); }
.contact-form { display: grid; grid-template-columns: 1fr 1fr; align-content: start; gap: 28px 24px; }
.contact-form label { display: grid; gap: 10px; font-size: 12px; letter-spacing: .12em; }
.contact-form label.full { grid-column: 1 / -1; }
.contact-form input, .contact-form select, .contact-form textarea { width: 100%; border: 0; border-bottom: 1px solid var(--ink); background: transparent; border-radius: 0; padding: 10px 0 13px; outline: none; resize: vertical; }
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus { border-bottom-color: var(--crimson); box-shadow: 0 1px 0 var(--crimson); }
.contact-form button { grid-column: 1 / -1; display: flex; justify-content: space-between; padding: 18px 20px; border: 0; background: var(--ink); color: white; cursor: pointer; }
.contact-form button:hover { background: var(--algae); }
.form-status { grid-column: 1 / -1; min-height: 24px; margin: 0; color: var(--crimson); line-height: 1.7; }

.site-footer { min-height: 210px; padding: 55px clamp(24px, 4vw, 68px); background: var(--ink); color: var(--paper); display: flex; align-items: flex-start; justify-content: space-between; gap: 40px; }
.footer-meta { display: grid; gap: 15px; text-align: right; font-size: 11px; letter-spacing: .1em; color: rgba(255,255,255,.5); }

.reveal { opacity: 1; transform: none; }

@media (max-width: 1080px) {
  .hero { min-height: 760px; }
  .hero-copy { width: 72vw; }
  .direction-panel { min-height: 650px; }
  .development-head { grid-template-columns: 1fr; gap: 30px; }
  .development-head h2 { grid-column: 1; }
  .timeline { grid-template-columns: 1fr 1fr; gap: 0; }
  .timeline::before { display: none; }
  .timeline li { min-height: 220px; padding: 36px 28px; border-top: 1px solid var(--line); }
  .timeline li::before { top: -5px; }
  .timeline time { margin-bottom: 30px; }
  .research-band { grid-template-columns: 1fr; }
  .research-image { min-height: 600px; }
  .about-copy { grid-template-columns: .7fr 1.3fr; }
  .about-copy > p:last-child { grid-column: 2; }
  .contact { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .site-header { height: 76px; padding: 0 20px; }
  .brand-mark { width: 42px; }
  .menu-toggle { display: block; position: relative; z-index: 32; }
  .menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(4px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-4px) rotate(-45deg); }
  .site-nav { position: fixed; z-index: 30; inset: 0; display: flex; flex-direction: column; justify-content: center; align-items: stretch; gap: 0; padding: 90px 30px 30px; background: var(--ink); transform: translateX(100%); transition: transform .35s cubic-bezier(.2,.8,.2,1); }
  .site-nav.open { transform: translateX(0); }
  .site-nav a { padding: 18px 0; border-bottom: 1px solid rgba(255,255,255,.2); font: 28px/1.2 Georgia, "Songti SC", serif; }
  .nav-contact { margin-top: 30px; padding: 18px !important; text-align: center; font-family: inherit !important; font-size: 14px !important; }
  .hero { min-height: 780px; height: 100svh; max-height: none; }
  .hero > img { object-position: 62% center; }
  .hero-wash { background: linear-gradient(90deg, rgba(10,13,11,.9), rgba(10,13,11,.24)), linear-gradient(0deg, rgba(10,13,11,.75), transparent); }
  .hero-copy { left: 20px; right: 20px; width: auto; top: 48%; }
  .eyebrow, .section-number { margin-bottom: 24px; }
  .hero h1 { font-size: clamp(57px, 17vw, 80px); }
  .hero-lead { font-size: 15px; line-height: 1.8; }
  .hero-actions { align-items: stretch; flex-direction: column; gap: 12px; }
  .primary-link { min-width: 0; width: 100%; }
  .text-link { width: max-content; }
  .manifesto { padding: 100px 20px 0; grid-template-columns: 1fr; gap: 42px; }
  .manifesto-heading h2, .development h2, .research-copy h2, .about-copy h2, .contact h2 { font-size: 44px; }
  .manifesto-body .lead-copy { font-size: 20px; }
  .material-figure { margin-top: 54px; display: block; }
  .material-figure img { width: calc(100% + 20px); height: 410px; margin-left: 0; object-position: 56% center; }
  .material-figure figcaption { margin-top: 12px; font-size: 10px; }
  .direction-strip { margin-top: 90px; grid-template-columns: 1fr; }
  .direction-panel { min-height: 600px; border-right: 0; border-bottom: 1px solid rgba(255,255,255,.25); }
  .direction-panel img { position: absolute; inset: 0; }
  .manufacturing { min-height: 850px; }
  .manufacturing-bg { object-position: 64% center; }
  .manufacturing-overlay { background: linear-gradient(90deg, rgba(5,7,6,.93), rgba(5,7,6,.52)); }
  .manufacturing-copy { padding: 100px 20px 80px; }
  .manufacturing h2 { font-size: 52px; }
  .development { padding: 100px 20px; }
  .timeline { margin-top: 70px; grid-template-columns: 1fr; }
  .timeline li { min-height: 0; padding: 36px 10px 42px 28px; border-right: 0; }
  .timeline p { max-width: none; }
  .research-image { min-height: 480px; }
  .research-copy { padding: 80px 20px; }
  .about { min-height: 920px; }
  .about-image img { object-position: 53% center; }
  .about-copy { grid-template-columns: 1fr; gap: 28px; padding: 80px 20px; }
  .about-copy h2, .about-copy > p:last-child { grid-column: 1; }
  .contact { padding: 100px 20px; }
  .contact-form { grid-template-columns: 1fr; }
  .contact-form label.full, .contact-form button, .form-status { grid-column: 1; }
  .site-footer { min-height: 250px; flex-direction: column; }
  .footer-meta { text-align: left; }
}

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