:root {
  --cream: #E3E2DE;
  --ink: #141414;
  --blue: #1351AA;
  --charcoal: #444343;
  --mid: #7A7A7A;
  --light: #C7C7C7;
  font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--cream);
  scroll-behavior: smooth;
}

* { box-sizing: border-box; }

html, body { margin: 0; min-width: 320px; background: var(--cream); }

body { overflow-x: hidden; }

a { color: inherit; }

img { display: block; width: 100%; height: 100%; object-fit: cover; }

.skip-link {
  position: fixed;
  left: 16px;
  top: -80px;
  z-index: 100;
  padding: 12px 18px;
  background: var(--ink);
  color: var(--cream);
  transition: top 180ms ease;
}

.skip-link:focus { top: 16px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: minmax(300px, 5fr) minmax(620px, 7fr);
  min-height: 76px;
  border-bottom: 1px solid var(--ink);
  background: var(--cream);
}

.brand {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 28px;
  border-right: 1px solid var(--ink);
  font-size: 17px;
  font-weight: 800;
  text-decoration: none;
  letter-spacing: -.03em;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  background: var(--blue);
  color: var(--cream);
  font-size: 14px;
  letter-spacing: -.04em;
}

.nav { display: flex; justify-content: flex-end; align-items: stretch; }

.nav a {
  display: grid;
  place-items: center;
  padding: 0 18px;
  border-left: 1px solid var(--light);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .06em;
  text-decoration: none;
  transition: color 160ms ease, background 160ms ease;
}

.nav a:hover, .nav a:focus-visible { color: var(--cream); background: var(--charcoal); }
.nav .nav-cta { color: var(--cream); background: var(--blue); }
.mobile-nav { display: none; }

.page-section {
  display: grid;
  grid-template-columns: 108px minmax(0, 1fr);
  border-bottom: 1px solid var(--ink);
}

.section-index {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  padding: 34px 12px;
  border-right: 1px solid var(--ink);
  background: var(--ink);
  color: var(--cream);
}

.section-index strong { font-size: clamp(42px, 4vw, 70px); line-height: .9; letter-spacing: -.08em; }
.section-index span { writing-mode: vertical-rl; font-size: 13px; font-weight: 800; letter-spacing: .12em; }
.section-content { min-width: 0; padding: clamp(48px, 6vw, 96px); }

.hero { min-height: calc(100vh - 76px); }
.hero-grid { display: grid; grid-template-columns: 5fr 7fr; gap: clamp(32px, 5vw, 80px); align-items: center; }
.hero-copy { max-width: 640px; }

.utility {
  margin: 0 0 22px;
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .14em;
  text-transform: uppercase;
}

h1, h2 { margin: 0; font-weight: 900; letter-spacing: -.07em; line-height: .94; }
h1 { max-width: 760px; font-size: clamp(54px, 7.2vw, 116px); }
h2 { font-size: clamp(42px, 5.4vw, 82px); }

.lead, .copy-block > p:not(.utility), .contact-copy > p:not(.utility) {
  max-width: 720px;
  margin: 30px 0 0;
  font-size: clamp(17px, 1.45vw, 22px);
  line-height: 1.75;
}

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 54px;
  padding: 0 24px;
  border: 1px solid var(--ink);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: .06em;
  text-decoration: none;
  transition: transform 160ms ease, color 160ms ease, background 160ms ease;
}

.button:hover, .button:focus-visible { transform: translateY(-3px); }
.button.primary { color: var(--cream); background: var(--blue); }
.button.secondary { color: var(--ink); background: var(--cream); }

.media { margin: 0; min-width: 0; border: 1px solid var(--ink); background: var(--light); }
.media img { aspect-ratio: 4 / 3; }
.hero-media img { aspect-ratio: 16 / 9; }

.split-layout, .application-layout, .process-layout, .quality-layout {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: clamp(36px, 6vw, 96px);
  align-items: center;
}

.fact-list { margin: 40px 0 0; border-top: 1px solid var(--ink); }
.fact-list div { display: grid; grid-template-columns: 1fr 1.4fr; gap: 18px; padding: 18px 0; border-bottom: 1px solid var(--light); }
.fact-list dt { font-size: 12px; font-weight: 900; letter-spacing: .1em; }
.fact-list dd { margin: 0; color: var(--charcoal); font-size: 14px; }

.cobalt-section { color: var(--cream); background: var(--blue); }
.cobalt-section .section-index { border-color: var(--cream); }
.business-layout { display: grid; grid-template-columns: 4fr 8fr; gap: 48px 64px; }
.inverse-copy { color: var(--cream); }
.business-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--cream); }
.business-list li { display: grid; grid-template-columns: 48px 1fr; gap: 18px; padding: 19px 0; border-bottom: 1px solid var(--cream); font-size: 15px; font-weight: 800; line-height: 1.5; }
.business-list span { font-size: 11px; letter-spacing: .12em; }
.wide-media { grid-column: 1 / -1; border-color: var(--cream); }
.wide-media img { aspect-ratio: 16 / 7; }

.application-layout { grid-template-columns: 7fr 5fr; }
.text-link { display: inline-flex; gap: 8px; margin-top: 30px; padding-bottom: 6px; border-bottom: 2px solid var(--blue); color: var(--blue); font-size: 13px; font-weight: 900; text-decoration: none; }

.dark-section { color: var(--cream); background: var(--ink); }
.dark-section .section-index { border-color: var(--cream); background: var(--blue); }
.dark-section .media { border-color: var(--cream); }
.flow { display: grid; grid-template-columns: 1fr 26px 1fr 26px 1fr; align-items: center; gap: 8px; margin-top: 42px; }
.flow span { padding: 18px 12px; border: 1px solid var(--cream); font-size: 12px; font-weight: 800; text-align: center; }
.flow i { display: block; height: 1px; background: var(--cream); }

.quality-layout { align-items: start; }
.quality-media { align-self: stretch; }
.quality-media img { min-height: 540px; }
.horizontal-facts { display: grid; grid-template-columns: repeat(3, 1fr); }
.horizontal-facts div { display: block; padding-right: 20px; border-right: 1px solid var(--light); }
.horizontal-facts dd { margin-top: 12px; }

.development-section { color: var(--cream); background: var(--blue); }
.development-section .section-index { border-color: var(--cream); }
.development-layout { display: grid; grid-template-columns: 3fr 4fr 5fr; gap: clamp(30px, 4vw, 72px); align-items: center; }
.signal-year { font-size: clamp(74px, 11vw, 172px); font-weight: 900; letter-spacing: -.1em; line-height: .78; writing-mode: vertical-rl; }
.inverse-link { color: var(--cream); border-color: var(--cream); }
.development-media { border-color: var(--cream); }

.contact-section { color: var(--cream); background: var(--ink); }
.contact-section .section-index { border-color: var(--cream); background: var(--charcoal); }
.contact-layout { display: grid; grid-template-columns: 7fr 5fr; gap: 50px; padding-bottom: 0; }
.contact-copy { align-self: center; padding-bottom: 70px; }
.contact-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); margin: 42px 0; border-top: 1px solid var(--mid); }
.contact-grid div { min-width: 0; padding: 20px 16px 20px 0; border-bottom: 1px solid var(--mid); }
.contact-grid div:nth-child(odd) { border-right: 1px solid var(--mid); }
.contact-grid div:nth-child(even) { padding-left: 20px; }
.contact-grid span { display: block; margin-bottom: 8px; color: var(--light); font-size: 11px; font-weight: 800; letter-spacing: .1em; }
.contact-grid strong { display: block; overflow-wrap: anywhere; font-size: 14px; line-height: 1.45; }
.contact-media { align-self: start; border-color: var(--cream); }
.site-footer { grid-column: 1 / -1; display: flex; justify-content: space-between; gap: 24px; margin: 0 calc(clamp(48px, 6vw, 96px) * -1); padding: 26px clamp(48px, 6vw, 96px); border-top: 1px solid var(--cream); font-size: 11px; font-weight: 800; letter-spacing: .05em; }

@media (max-width: 1100px) {
  .site-header { grid-template-columns: minmax(0, 1fr) auto; }
  .brand { min-width: 0; border-right: 1px solid var(--ink); }
  .nav { display: none; }
  .mobile-nav { position: relative; display: block; align-self: center; margin-right: 14px; }
  .mobile-nav summary { padding: 10px 14px; color: var(--cream); background: var(--blue); border: 1px solid var(--ink); font-size: 11px; font-weight: 900; letter-spacing: .06em; list-style: none; cursor: pointer; }
  .mobile-nav summary::-webkit-details-marker { display: none; }
  .mobile-nav div { position: absolute; top: calc(100% + 12px); right: 0; min-width: 190px; padding: 8px 18px; color: var(--cream); background: var(--ink); border: 1px solid var(--cream); }
  .mobile-nav a { display: block; padding: 11px 0; border-bottom: 1px solid var(--mid); font-size: 11px; font-weight: 800; text-decoration: none; }
  .mobile-nav a:last-child { border-bottom: 0; }
  .hero { min-height: auto; }
  .hero-grid, .split-layout, .application-layout, .process-layout, .quality-layout, .development-layout, .contact-layout { grid-template-columns: 1fr; }
  .business-layout { grid-template-columns: 1fr; }
  .application-media { order: 2; }
  .signal-year { writing-mode: horizontal-tb; }
  .contact-media { max-width: 760px; }
}

@media (max-width: 720px) {
  .site-header { position: static; }
  .brand { padding: 12px 16px; font-size: 14px; }
  .brand-mark { width: 40px; height: 40px; }
  .nav a { padding: 0 14px; font-size: 11px; }
  .page-section { grid-template-columns: 48px minmax(0, 1fr); }
  .section-index { gap: 14px; padding: 22px 6px; }
  .section-index strong { font-size: 26px; }
  .section-index span { font-size: 9px; }
  .section-content { padding: 44px 20px; }
  h1 { font-size: clamp(46px, 15vw, 66px); }
  h2 { font-size: clamp(38px, 12vw, 54px); }
  .lead, .copy-block > p:not(.utility), .contact-copy > p:not(.utility) { font-size: 16px; line-height: 1.7; }
  .hero-grid, .split-layout, .application-layout, .process-layout, .quality-layout, .business-layout, .development-layout, .contact-layout { gap: 36px; }
  .hero-media img, .wide-media img { aspect-ratio: 4 / 3; }
  .business-list li { grid-template-columns: 38px 1fr; font-size: 13px; }
  .flow { grid-template-columns: 1fr; }
  .flow i { width: 1px; height: 18px; margin: 0 auto; }
  .horizontal-facts { grid-template-columns: 1fr; }
  .horizontal-facts div { border-right: 0; }
  .quality-media img { min-height: 0; }
  .signal-year { font-size: 72px; }
  .contact-grid { grid-template-columns: 1fr; }
  .contact-grid div:nth-child(odd) { border-right: 0; }
  .contact-grid div:nth-child(even) { padding-left: 0; }
  .site-footer { flex-direction: column; margin: 0 -20px; padding: 24px 20px; }
}

@media (prefers-reduced-motion: reduce) {
  :root { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}