:root {
  --navy: #092844;
  --copper: #B95F2A;
  --steel: #67737C;
  --ice: #F5F7F8;
  --white: #FFFFFF;
  --line: #B8C1C7;
  --ink: #102232;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  color: var(--ink);
  background: var(--ice);
  scroll-behavior: smooth;
}

* { box-sizing: border-box; }

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

body { overflow-x: hidden; }

a { color: inherit; }

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

.skip-link {
  position: fixed;
  left: 18px;
  top: -80px;
  z-index: 100;
  padding: 12px 18px;
  background: var(--copper);
  color: var(--white);
}

.skip-link:focus { top: 18px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: minmax(330px, 5fr) minmax(680px, 7fr);
  min-height: 76px;
  border-bottom: 1px solid var(--line);
  background: var(--navy);
  color: var(--white);
}

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

.brand-mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 2px solid var(--copper);
  color: var(--copper);
  font-size: 13px;
  letter-spacing: .05em;
}

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

.nav a {
  display: grid;
  place-items: center;
  padding: 0 15px;
  border-left: 1px solid var(--steel);
  font-size: 12px;
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}

.nav a:hover, .nav a:focus-visible { color: var(--copper); background: var(--white); }

.nav .nav-cta { color: var(--white); background: var(--copper); }

.mobile-nav { display: none; }

.page-section {
  position: relative;
  display: grid;
  min-width: 0;
  border-bottom: 1px solid var(--line);
}

.section-number {
  color: var(--copper);
  font-size: clamp(44px, 6vw, 86px);
  font-weight: 900;
  line-height: .82;
  letter-spacing: -.08em;
}

.section-label {
  margin: 0 0 18px;
  color: var(--copper);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .14em;
}

h1, h2 { margin: 0; font-weight: 900; line-height: 1.02; letter-spacing: -.055em; }

h1 { max-width: 760px; font-size: clamp(50px, 6.7vw, 104px); }

h2 { max-width: 870px; font-size: clamp(40px, 5.3vw, 78px); }

p { font-size: clamp(16px, 1.35vw, 20px); line-height: 1.75; }

.hero {
  grid-template-columns: minmax(430px, 5fr) minmax(0, 7fr);
  min-height: calc(100vh - 76px);
  background: var(--white);
}

.hero > .section-number {
  position: absolute;
  top: 28px;
  left: 28px;
  z-index: 2;
}

.hero-copy {
  grid-column: 1;
  align-self: center;
  padding: clamp(52px, 7vw, 112px) clamp(34px, 5vw, 78px);
}

.hero-subtitle { margin: 22px 0 0; color: var(--steel); font-size: clamp(24px, 2.35vw, 36px); font-weight: 700; line-height: 1.3; }

.lead { max-width: 680px; margin: 28px 0 0; }

.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(--copper);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: .05em;
  text-decoration: none;
}

.button:hover, .button:focus-visible { color: var(--navy); background: var(--white); }

.button.primary { color: var(--white); background: var(--copper); }

.button.secondary { color: var(--copper); background: var(--white); }


.media { margin: 0; min-width: 0; border: 1px solid var(--line); background: var(--steel); }

.media img { aspect-ratio: 4 / 3; }


.hero-media { border: 0; border-left: 1px solid var(--line); }

.hero-media { grid-column: 2; }

.hero-media img { min-height: calc(100vh - 115px); aspect-ratio: auto; }

.section-heading { display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: 40px; }

.section-heading p:not(.section-label) { max-width: 780px; margin: 28px 0 0; }

.products-section {
  grid-template-columns: minmax(0, 7fr) minmax(360px, 5fr);
  gap: 48px 72px;
  padding: clamp(62px, 7vw, 108px);
  background: var(--ice);
}

.products-section .section-heading { grid-column: 1 / -1; }

.product-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); align-self: stretch; border-top: 1px solid var(--steel); border-left: 1px solid var(--steel); }

.product-grid div { display: flex; min-height: 170px; flex-direction: column; justify-content: space-between; padding: 20px; border-right: 1px solid var(--steel); border-bottom: 1px solid var(--steel); background: var(--white); }

.product-grid span { color: var(--copper); font-size: 11px; font-weight: 900; letter-spacing: .12em; }

.product-grid strong { font-size: clamp(17px, 1.55vw, 23px); line-height: 1.35; }

.product-media img { min-height: 380px; }

.navy-section {
  grid-template-columns: minmax(360px, 5fr) minmax(0, 7fr);
  gap: 48px 72px;
  padding: clamp(62px, 7vw, 108px);
  color: var(--white);
  background: var(--navy);
}

.inverse-copy { color: var(--white); }

.inverse-copy p:not(.section-label) { max-width: 720px; }

.text-link { display: inline-flex; gap: 8px; margin-top: 26px; padding-bottom: 5px; border-bottom: 2px solid var(--copper); color: var(--copper); font-size: 13px; font-weight: 900; text-decoration: none; }

.inverse-link { color: var(--white); border-color: var(--copper); }

.applications-media { align-self: end; border-color: var(--steel); }

.applications-wide { grid-column: 1 / -1; border-color: var(--steel); }

.applications-wide img { aspect-ratio: 16 / 7; }

.manufacturing-section {
  grid-template-columns: minmax(0, 7fr) minmax(360px, 5fr);
  gap: 48px 72px;
  padding: clamp(62px, 7vw, 108px);
  background: var(--white);
}

.manufacturing-section .section-heading { grid-column: 1 / -1; }

.process-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }

.process-list li { display: grid; grid-template-columns: 44px 1fr auto; gap: 20px; align-items: center; min-height: 82px; border-bottom: 1px solid var(--line); }

.process-list span { color: var(--copper); font-size: 11px; font-weight: 900; letter-spacing: .1em; }

.process-list strong { font-size: 17px; }

.process-list small { color: var(--steel); font-size: 12px; }

.manufacturing-media img { min-height: 420px; }

.steel-section {
  grid-template-columns: minmax(340px, 4fr) minmax(0, 8fr);
  gap: 72px;
  padding: clamp(62px, 7vw, 108px);
  background: var(--ice);
}

.quality-copy { align-self: center; }

.quality-copy .section-number { margin-bottom: 48px; }

.quality-gallery { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }

.quality-gallery .media img { min-height: 520px; }

.signal-section {
  grid-template-columns: 140px minmax(240px, 3fr) minmax(0, 6fr);
  gap: 48px;
  align-items: center;
  padding: clamp(62px, 7vw, 108px);
  color: var(--white);
  background: var(--copper);
}

.signal-section .section-number, .signal-section .section-label { color: var(--navy); }

.signal-mark { color: var(--navy); font-size: clamp(76px, 11vw, 170px); font-weight: 900; line-height: .82; letter-spacing: -.1em; writing-mode: vertical-rl; }

.signal-copy .text-link { color: var(--white); border-color: var(--white); }

.about-section {
  grid-template-columns: minmax(0, 7fr) minmax(360px, 5fr);
  gap: 72px;
  padding: clamp(62px, 7vw, 108px);
  background: var(--white);
}

.about-facts { margin: 0; border-top: 1px solid var(--navy); }

.about-facts div { display: grid; grid-template-columns: 1fr 1.5fr; gap: 18px; padding: 20px 0; border-bottom: 1px solid var(--line); }

.about-facts dt { color: var(--steel); font-size: 12px; font-weight: 900; letter-spacing: .08em; }

.about-facts dd { margin: 0; font-size: 14px; font-weight: 700; line-height: 1.5; }

.contact-section {
  grid-template-columns: minmax(0, 7fr) minmax(360px, 5fr);
  gap: 48px 72px;
  padding: clamp(62px, 7vw, 108px) clamp(62px, 7vw, 108px) 0;
  color: var(--white);
  background: var(--navy);
}

.contact-copy { align-self: center; padding-bottom: 74px; }

.contact-copy .section-number { margin-bottom: 48px; }

.contact-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); margin: 38px 0; border-top: 1px solid var(--steel); }

.contact-grid div { min-width: 0; padding: 18px 16px 18px 0; border-bottom: 1px solid var(--steel); }

.contact-grid div:nth-child(odd) { border-right: 1px solid var(--steel); }

.contact-grid div:nth-child(even) { padding-left: 20px; }

.contact-grid span { display: block; margin-bottom: 8px; color: var(--line); font-size: 11px; font-weight: 900; letter-spacing: .1em; }

.contact-grid strong { display: block; overflow-wrap: anywhere; font-size: 14px; line-height: 1.5; }

.contact-media { align-self: start; border-color: var(--steel); }

.contact-media img { min-height: 510px; }

.site-footer { grid-column: 1 / -1; display: flex; justify-content: space-between; gap: 24px; margin: 0 calc(clamp(62px, 7vw, 108px) * -1); padding: 26px clamp(62px, 7vw, 108px); border-top: 1px solid var(--steel); 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(--steel); }
  .brand span:last-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .nav { display: none; }
  .mobile-nav { display: block; position: relative; }
  .mobile-nav summary {
    display: grid;
    min-width: 76px;
    height: 100%;
    place-items: center;
    padding: 0 18px;
    color: var(--white);
    background: var(--copper);
    cursor: pointer;
    font-size: 12px;
    font-weight: 900;
    letter-spacing: .08em;
    list-style: none;
  }
  .mobile-nav summary::-webkit-details-marker { display: none; }
  .mobile-nav > div {
    position: absolute;
    top: calc(100% + 1px);
    right: 0;
    width: min(320px, calc(100vw - 20px));
    border: 1px solid var(--steel);
    background: var(--navy);
  }
  .mobile-nav a {
    display: block;
    padding: 16px 18px;
    border-bottom: 1px solid var(--steel);
    font-size: 13px;
    font-weight: 800;
    text-decoration: none;
  }
  .mobile-nav a:last-child { border-bottom: 0; }
  .mobile-nav a:hover, .mobile-nav a:focus-visible { color: var(--copper); background: var(--white); }
  .mobile-nav .nav-cta { color: var(--white); background: var(--copper); }
  .hero, .products-section, .navy-section, .manufacturing-section, .steel-section, .about-section, .contact-section { grid-template-columns: 1fr; }
  .hero { min-height: auto; }
  .hero-copy, .hero-media { grid-column: 1; }
  .hero-media { border-left: 0; border-top: 1px solid var(--line); }
  .hero-media img { min-height: 560px; }
  .products-section .section-heading, .manufacturing-section .section-heading, .applications-wide, .site-footer { grid-column: 1; }
  .product-grid { grid-template-columns: repeat(5, minmax(150px, 1fr)); overflow-x: auto; }
  .signal-section { grid-template-columns: 100px 220px 1fr; }
}

@media (max-width: 720px) {
  .brand { padding: 12px 16px; font-size: 14px; }
  .brand-mark { width: 40px; height: 40px; }
  .mobile-nav summary { min-width: 68px; padding: 0 14px; }
  .hero-copy, .products-section, .navy-section, .manufacturing-section, .steel-section, .signal-section, .about-section { padding: 44px 20px; }
  .contact-section { padding: 44px 20px 0; }
  .hero > .section-number { top: 18px; left: 20px; }
  .quality-copy .section-number, .contact-copy .section-number { margin-bottom: 34px; }
  .section-heading { grid-template-columns: 1fr; gap: 24px; }
  h1 { font-size: clamp(46px, 14vw, 64px); }
  h2 { font-size: clamp(38px, 11vw, 54px); }
  p { font-size: 16px; }
  .hero-media img { min-height: 0; aspect-ratio: 4 / 3; }
  .product-grid { grid-template-columns: 1fr; overflow: visible; }
  .product-grid div { min-height: 110px; }
  .applications-wide img { aspect-ratio: 4 / 3; }
  .process-list li { grid-template-columns: 34px 1fr; padding: 14px 0; }
  .process-list small { grid-column: 2; }
  .quality-gallery { grid-template-columns: 1fr; }
  .quality-gallery .media img { min-height: 0; }
  .signal-section { grid-template-columns: 1fr; gap: 28px; }
  .signal-mark { writing-mode: horizontal-tb; font-size: 78px; }
  .about-facts div { grid-template-columns: 1fr; gap: 8px; }
  .contact-grid { grid-template-columns: 1fr; }
  .contact-grid div:nth-child(odd) { border-right: 0; }
  .contact-grid div:nth-child(even) { padding-left: 0; }
  .contact-media img { min-height: 0; }
  .site-footer { flex-direction: column; margin: 0 -20px; padding: 24px 20px; }
}

@media (prefers-reduced-motion: reduce) {
  :root { scroll-behavior: auto; }
}