:root {
  --paper: #f7f8fa;
  --white: #ffffff;
  --ink: #102131;
  --muted: #546372;
  --line: #cbd6e0;
  --blue: #0057b8;
  --blue-deep: #082f58;
  --navy: #071f36;
  --orange: #f05a22;
  --orange-text: #b33a0d;
  --max: 1440px;
  --pad: clamp(24px, 4vw, 72px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
body.menu-open { overflow: hidden; }
img { display: block; width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button, a, input, select, textarea { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 2px solid var(--orange); outline-offset: 4px; }
.skip-link { position: fixed; left: 12px; top: -80px; z-index: 1000; background: var(--navy); color: white; padding: 12px 16px; }
.skip-link:focus { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  min-height: 78px;
  padding: 0 var(--pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(247, 248, 250, .94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}
.brand { display: inline-flex; align-items: center; gap: 12px; min-height: 48px; }
.brand-mark { width: 40px; height: 40px; color: var(--blue); flex: 0 0 auto; }
.brand span { display: grid; line-height: 1.1; }
.brand strong { font-size: 17px; letter-spacing: .04em; }
.brand small { margin-top: 5px; font-size: 9px; letter-spacing: .2em; color: var(--muted); }
.site-nav { display: flex; align-items: center; gap: clamp(20px, 2.5vw, 42px); }
.site-nav a { display: inline-flex; align-items: center; min-height: 44px; font-size: 13px; font-weight: 700; letter-spacing: .04em; }
.site-nav a:focus { outline: 2px solid var(--orange); outline-offset: 4px; }
.site-nav a:not(.nav-contact)::after { content: ""; width: 0; height: 2px; background: var(--blue); position: absolute; bottom: 10px; transition: width .25s ease; }
.site-nav a { position: relative; }
.site-nav a:hover::after { width: 100%; }
.nav-contact { color: white; background: var(--blue); padding: 0 20px; }
.nav-contact:hover { background: var(--blue-deep); }
.menu-toggle { display: none; width: 48px; height: 48px; border: 0; padding: 12px; background: transparent; cursor: pointer; }
.menu-toggle span { display: block; height: 2px; margin: 5px 0; background: var(--ink); transition: transform .25s ease, opacity .2s ease; }

.hero { max-width: var(--max); margin: 0 auto; min-height: calc(100vh - 78px); display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); border-inline: 1px solid var(--line); }
.hero-copy { display: flex; flex-direction: column; justify-content: center; padding: clamp(64px, 7vw, 112px) var(--pad) 48px; border-right: 1px solid var(--line); }
.eyebrow, .section-index, .product-type { margin: 0 0 28px; color: var(--blue); font: 700 11px/1.2 ui-monospace, "Cascadia Mono", monospace; letter-spacing: .16em; }
.hero h1 { margin: 0; max-width: 650px; font-size: clamp(48px, 5.5vw, 90px); line-height: .98; letter-spacing: -.07em; font-weight: 850; }
.hero h1 em { color: var(--blue); font-style: normal; }
.hero-lede { max-width: 590px; margin: 34px 0 0; font-size: clamp(16px, 1.35vw, 20px); color: var(--muted); }
.hero-actions { display: flex; align-items: center; gap: 28px; margin-top: 38px; }
.button { min-height: 48px; border: 0; display: inline-flex; align-items: center; justify-content: center; padding: 12px 24px; font-weight: 800; cursor: pointer; }
.button-primary { color: white; background: var(--blue); }
.button-primary:hover { background: var(--blue-deep); }
.text-link { min-height: 44px; display: inline-flex; align-items: center; gap: 10px; font-size: 14px; font-weight: 800; border-bottom: 1px solid var(--ink); }
.text-link span { color: var(--orange); }
.hero-index { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; margin: auto 0 0; padding: 42px 0 0; }
.hero-index div { min-height: 100px; padding: 0 18px; border-left: 1px solid var(--line); }
.hero-index div:first-child { padding-left: 0; border-left: 0; }
.hero-index dt { color: var(--orange-text); font: 700 12px/1 ui-monospace, monospace; }
.hero-index dd { margin: 14px 0 0; font-size: 13px; font-weight: 750; line-height: 1.45; }
.hero-media { min-height: 680px; margin: 0; display: grid; grid-template-rows: 1fr auto; background: white; overflow: hidden; }
.hero-media img { height: 100%; object-fit: cover; object-position: center; }
.hero-media figcaption, .engineering-media figcaption { display: flex; justify-content: space-between; padding: 16px 20px; color: var(--blue-deep); background: var(--white); border-top: 1px solid var(--line); font: 700 9px/1 ui-monospace, monospace; letter-spacing: .14em; }

.section { max-width: var(--max); margin: 0 auto; padding: 120px var(--pad); border-inline: 1px solid var(--line); }
.section-heading { display: grid; grid-template-columns: 2fr 5fr 3fr; align-items: start; gap: clamp(24px, 4vw, 72px); padding-bottom: 72px; }
.section-heading h2, .applications h2, .engineering h2, .contact h2 { margin: 0; font-size: clamp(38px, 4.8vw, 72px); line-height: 1.05; letter-spacing: -.055em; }
.section-heading > p:last-child { margin: 8px 0 0; color: var(--muted); }

.product-row { min-height: 410px; display: grid; grid-template-columns: 1fr 4fr 6fr; border-top: 1px solid var(--line); overflow: hidden; }
.product-row:last-child { border-bottom: 1px solid var(--line); }
.product-number { padding: 34px 24px 30px 0; color: var(--orange-text); font: 800 13px/1 ui-monospace, monospace; }
.product-copy { padding: 32px clamp(24px, 4vw, 64px) 36px 0; display: flex; flex-direction: column; border-right: 1px solid var(--line); }
.product-copy h3 { margin: 0; max-width: 420px; font-size: clamp(29px, 3vw, 48px); line-height: 1.08; letter-spacing: -.04em; }
.product-copy > p:not(.product-type) { max-width: 470px; margin: 24px 0; color: var(--muted); }
.product-copy a { margin-top: auto; width: fit-content; min-height: 44px; display: inline-flex; align-items: center; gap: 12px; font-size: 13px; font-weight: 800; }
.product-copy a span { color: var(--orange); }
.product-row figure { margin: 0; min-height: 410px; background: white; overflow: hidden; }
.product-row figure img { height: 100%; object-fit: cover; transition: transform .65s cubic-bezier(.22,.61,.36,1); }
.product-row:hover figure img { transform: scale(1.025); }
.product-row-inverse { background: var(--navy); color: white; border-color: rgba(255,255,255,.2); }
.product-row-inverse .product-copy { border-color: rgba(255,255,255,.2); }
.product-row-inverse .product-copy > p:not(.product-type) { color: #bbcbd8; }
.product-row-inverse .product-number { color: var(--orange); }
.product-row-inverse .product-type, .applications-copy .section-index { color: #85bdf0; }

.applications { max-width: var(--max); margin: 0 auto; display: grid; grid-template-columns: 7fr 5fr; background: var(--navy); color: white; border-inline: 1px solid var(--line); }
.applications-media { min-height: 760px; }
.applications-media img { height: 100%; object-fit: cover; }
.applications-copy { padding: 100px var(--pad); }
.applications-copy > p:not(.section-index) { color: #b6c7d6; max-width: 570px; }
.application-list { margin: 56px 0 0; padding: 0; list-style: none; border-top: 1px solid rgba(255,255,255,.24); }
.application-list li { min-height: 75px; display: grid; grid-template-columns: 52px 1fr auto; align-items: center; gap: 18px; border-bottom: 1px solid rgba(255,255,255,.24); }
.application-list span { color: var(--orange); font: 800 12px/1 ui-monospace, monospace; }
.application-list strong { font-size: 18px; }
.application-list small { color: #90a8ba; font: 700 9px/1 ui-monospace, monospace; letter-spacing: .12em; }

.selection-visual { margin: 0; border-block: 1px solid var(--line); }
.selection-visual img { aspect-ratio: 16 / 6.6; object-fit: cover; }
.selection-steps { margin: 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(4, 1fr); border-bottom: 1px solid var(--line); }
.selection-steps li { min-height: 250px; padding: 30px 28px 38px; display: flex; flex-direction: column; border-right: 1px solid var(--line); }
.selection-steps li:last-child { border-right: 0; }
.selection-steps span { color: var(--orange-text); font: 800 12px/1 ui-monospace, monospace; }
.selection-steps div { margin-top: auto; }
.selection-steps h3 { margin: 0 0 13px; font-size: 21px; }
.selection-steps p { margin: 0; color: var(--muted); font-size: 14px; }

.engineering { max-width: var(--max); margin: 0 auto; display: grid; grid-template-columns: 5fr 7fr; background: var(--blue-deep); color: white; border-inline: 1px solid var(--line); }
.engineering-copy { padding: 104px var(--pad); }
.section-index.light { color: #85bdf0; }
.engineering-copy > p:not(.section-index) { margin: 28px 0 0; color: #c1d2df; }
.engineering-points { margin: 56px 0 0; }
.engineering-points div { display: grid; grid-template-columns: 100px 1fr; gap: 24px; padding: 24px 0; border-top: 1px solid rgba(255,255,255,.22); }
.engineering-points div:last-child { border-bottom: 1px solid rgba(255,255,255,.22); }
.engineering-points dt { color: #8bc5fb; font: 800 10px/1.4 ui-monospace, monospace; letter-spacing: .14em; }
.engineering-points dd { margin: 0; color: #c1d2df; font-size: 14px; }
.engineering-media { margin: 0; min-height: 760px; display: grid; grid-template-rows: 1fr auto; overflow: hidden; }
.engineering-media img { height: 100%; object-fit: cover; }

.contact { max-width: var(--max); margin: 0 auto; display: grid; grid-template-columns: 5fr 7fr; background: white; border-inline: 1px solid var(--line); }
.contact-visual { min-height: 840px; overflow: hidden; }
.contact-visual img { height: 100%; object-fit: cover; object-position: 66% center; }
.contact-panel { padding: 100px var(--pad); }
.contact-intro { max-width: 650px; color: var(--muted); }
.contact-form { margin-top: 48px; display: grid; grid-template-columns: 1fr 1fr; gap: 24px 28px; }
.contact-form label { display: grid; gap: 8px; }
.contact-form label > span { font-size: 12px; font-weight: 800; letter-spacing: .08em; }
.contact-form input, .contact-form select, .contact-form textarea { width: 100%; min-height: 48px; border: 0; border-bottom: 1px solid #91a2b2; border-radius: 0; color: var(--ink); background: transparent; padding: 10px 2px; }
.contact-form textarea { resize: vertical; }
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus { border-bottom-color: var(--orange); outline: 0; box-shadow: 0 2px 0 var(--orange); }
.form-wide { grid-column: 1 / -1; }
.contact-form button { width: 100%; }
.form-status { min-height: 26px; margin: 0; color: #a33a14; font-weight: 750; font-size: 14px; }
.contact-panel address { margin-top: 38px; padding-top: 28px; display: grid; gap: 8px; border-top: 1px solid var(--line); font-style: normal; color: var(--muted); font-size: 14px; }
.contact-panel address a { width: fit-content; color: var(--blue-deep); font-weight: 750; }

.site-footer { max-width: var(--max); margin: 0 auto; min-height: 190px; padding: 48px var(--pad); display: flex; justify-content: space-between; align-items: flex-end; color: white; background: var(--navy); border-inline: 1px solid var(--line); }
.footer-brand { display: flex; align-items: center; gap: 18px; }
.footer-brand .brand-mark { color: white; }
.footer-brand div { display: grid; }
.footer-brand small { margin-top: 6px; color: #88a0b3; font-size: 9px; letter-spacing: .12em; }
.footer-meta { display: grid; gap: 8px; text-align: right; color: #a8bac8; font: 700 10px/1.4 ui-monospace, monospace; letter-spacing: .08em; }

.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 1100px) {
  .hero { min-height: auto; grid-template-columns: 1fr; }
  .hero-copy { min-height: 680px; border-right: 0; border-bottom: 1px solid var(--line); }
  .hero-media { min-height: 580px; }
  .section-heading { grid-template-columns: 1fr 2fr; }
  .section-heading > p:last-child { grid-column: 2; }
  .applications, .engineering, .contact { grid-template-columns: 1fr; }
  .applications-media, .engineering-media, .contact-visual { min-height: 560px; }
  .selection-steps { grid-template-columns: 1fr 1fr; }
  .selection-steps li:nth-child(2) { border-right: 0; }
  .selection-steps li:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
}

@media (max-width: 980px) {
  :root { --pad: 24px; }
  .site-header { min-height: 68px; }
  .menu-toggle { display: block; position: relative; z-index: 102; }
  .site-nav { position: fixed; inset: 0; z-index: 101; width: 100vw; height: 100dvh; min-height: 100vh; display: flex; flex-direction: column; justify-content: center; align-items: stretch; gap: 0; overflow-y: auto; padding: 88px 28px 40px; color: white; background: var(--navy); visibility: hidden; pointer-events: none; opacity: 0; transition: opacity .25s ease, visibility .25s ease; }
  .site-nav.is-open { visibility: visible; pointer-events: auto; opacity: 1; }
  .site-nav a { min-height: 64px; padding: 0; border-bottom: 1px solid rgba(255,255,255,.22); font-size: 21px; }
  .site-nav a::after { display: none; }
  .site-nav .nav-contact { margin-top: 24px; justify-content: center; padding: 0 20px; border-bottom: 0; background: var(--orange); }
  .menu-toggle[aria-expanded="true"] span { background: white; }
  .menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .hero-copy { min-height: calc(100svh - 68px); padding-top: 72px; }
  .hero h1 { font-size: clamp(46px, 13vw, 72px); }
  .hero-index { margin-top: 58px; }
  .hero-media { min-height: 480px; }
  .section { padding-block: 88px; }
  .section-heading { grid-template-columns: 1fr; padding-bottom: 50px; }
  .section-heading > p:last-child { grid-column: auto; }
  .product-row { grid-template-columns: 70px 1fr; }
  .product-row figure { grid-column: 1 / -1; grid-row: 2; min-height: 330px; }
  .product-copy { border-right: 0; }
  .application-list li { grid-template-columns: 44px 1fr; }
  .application-list small { grid-column: 2; margin-top: -22px; padding-bottom: 18px; }
  .selection-visual img { aspect-ratio: 16 / 9; }
  .site-footer { align-items: flex-start; flex-direction: column; gap: 48px; }
  .footer-meta { text-align: left; }
}

@media (max-width: 560px) {
  .brand strong { font-size: 15px; }
  .brand small { display: none; }
  .hero-copy { padding-top: 54px; }
  .hero-actions { align-items: stretch; flex-direction: column; gap: 14px; }
  .button, .text-link { width: 100%; justify-content: center; }
  .hero-index dd { font-size: 11px; }
  .hero-index div { padding-inline: 10px; }
  .hero-media { min-height: 340px; }
  .hero-media figcaption span:last-child { display: none; }
  .product-row { grid-template-columns: 52px 1fr; }
  .product-number { padding-right: 8px; }
  .product-copy { padding-right: 0; }
  .product-row figure { min-height: 260px; }
  .applications-media, .engineering-media, .contact-visual { min-height: 340px; }
  .applications-copy, .engineering-copy, .contact-panel { padding-block: 76px; }
  .selection-steps { grid-template-columns: 1fr; }
  .selection-steps li { min-height: 205px; border-right: 0; border-bottom: 1px solid var(--line); }
  .selection-steps li:last-child { border-bottom: 0; }
  .contact-form { grid-template-columns: 1fr; }
  .form-wide { grid-column: auto; }
  .footer-brand strong { font-size: 14px; }
  .footer-brand small { font-size: 7px; }
}

@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; }
}