:root {
  --paper: #f5f4f0;
  --paper-2: #ebe7df;
  --ink: #272221;
  --muted: #655e5b;
  --red: #b81422;
  --deep-red: #73050e;
  --line: #ced1cd;
  --steel: #222f3e;
  --white: #ffffff;
  --sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html { min-width: 320px; scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(39,34,33,.055) 1px, transparent 1px) 0 0 / 72px 72px,
    linear-gradient(180deg, rgba(39,34,33,.045) 1px, transparent 1px) 0 0 / 72px 72px,
    var(--paper);
  font-family: var(--sans);
  line-height: 1.65;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .16;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160' viewBox='0 0 160 160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='.28'/%3E%3C/svg%3E");
}
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: .18em; }
a:hover { color: var(--red); }
img { display: block; max-width: 100%; height: auto; }
button, input { font: inherit; }
body [data-lang="en"] { display: none !important; }
html[data-lang="en"] body [data-lang="zh"] { display: none !important; }
html[data-lang="en"] body [data-lang="en"] { display: revert !important; }
html[data-lang="en"] body span[data-lang="en"],
html[data-lang="en"] body b[data-lang="en"],
html[data-lang="en"] body strong[data-lang="en"],
html[data-lang="en"] body small[data-lang="en"],
html[data-lang="en"] body em[data-lang="en"],
html[data-lang="en"] body dt[data-lang="en"] { display: inline !important; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(245,244,240,.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}
.header-inner {
  max-width: 1240px;
  margin: 0 auto;
  min-height: 74px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 14px; text-decoration: none; min-width: 0; }
.brand img { width: 118px; height: auto; }
.brand-copy { display: grid; line-height: 1.15; }
.brand-copy strong { font-size: 17px; letter-spacing: .03em; }
.brand-copy small { color: var(--red); font-size: 12px; letter-spacing: .12em; text-transform: uppercase; }
.site-menu { display: flex; align-items: center; gap: 8px; }
.site-menu a, .lang-toggle {
  min-height: 44px;
  padding: 11px 14px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--ink);
  text-decoration: none;
  cursor: pointer;
}
.site-menu a.active, .site-menu a:hover, .lang-toggle:hover { border-color: var(--ink); color: var(--red); }
.lang-toggle { font-family: var(--mono); min-width: 54px; }
.menu-toggle { display: none; align-items: center; gap: 5px; border: 1px solid var(--ink); background: transparent; min-height: 44px; padding: 8px 10px; }
.menu-toggle span { width: 18px; height: 1px; background: var(--ink); display: block; }
.menu-toggle b { font-weight: 500; margin-left: 6px; }

.hero-shell {
  position: relative;
  min-height: calc(100vh - 74px);
  display: grid;
  grid-template-columns: minmax(24px, 1fr) minmax(0, 760px) minmax(280px, 420px) minmax(24px, 1fr);
  align-items: end;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.hero-grid { position: absolute; inset: 0; background: linear-gradient(90deg, transparent 0 62%, rgba(184,20,34,.08) 62% 100%); }
.hero-media { position: absolute; inset: 0; opacity: .18; filter: grayscale(1) contrast(1.1); }
.hero-media img { width: 100%; height: 100%; object-fit: cover; }
.hero-copy { position: relative; grid-column: 2 / 3; padding: 96px 0; }
.hero-facts { position: relative; grid-column: 3 / 4; align-self: stretch; display: flex; align-items: end; padding: 96px 0; }
.eyebrow { margin: 0 0 14px; color: var(--red); font-family: var(--mono); font-size: 13px; letter-spacing: .12em; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(42px, 7vw, 92px); line-height: .98; letter-spacing: -.055em; max-width: 860px; }
h2 { font-size: clamp(28px, 4vw, 56px); line-height: 1.05; letter-spacing: -.035em; }
.lead, .page-hero p { color: var(--muted); font-size: clamp(18px, 2vw, 22px); max-width: 780px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 52px; padding: 13px 20px; border: 1px solid var(--ink); text-decoration: none; }
.button.primary { background: var(--red); border-color: var(--red); color: var(--white); }
.button.secondary { background: rgba(245,244,240,.72); }
.hero-facts dl { width: 100%; margin: 0; border-top: 1px solid var(--ink); background: rgba(245,244,240,.76); }
.hero-facts div { padding: 18px; border-bottom: 1px solid var(--line); }
.hero-facts dt { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .12em; }
.hero-facts dd { margin: 2px 0 0; font-size: 20px; font-weight: 700; overflow-wrap: anywhere; }

.section-pad { max-width: 1240px; margin: 0 auto; padding: 92px 24px; }
.section-heading { display: grid; grid-template-columns: 280px 1fr; gap: 32px; align-items: start; margin-bottom: 42px; }
.line-index { border-top: 1px solid var(--ink); }
.index-line { display: grid; grid-template-columns: 92px minmax(220px, 360px) 1fr; gap: 24px; align-items: baseline; min-height: 86px; padding: 22px 0; border-bottom: 1px solid var(--line); text-decoration: none; }
.index-line .num { color: var(--red); font-family: var(--mono); font-size: 18px; }
.index-line strong { font-size: clamp(20px, 2vw, 28px); }
.index-line em { color: var(--muted); font-style: normal; }
.index-line:hover { background: rgba(184,20,34,.045); }
.muted-band { max-width: none; background: var(--paper-2); border-block: 1px solid var(--line); }
.muted-band > * { max-width: 1192px; margin-inline: auto; }
.split-layout { display: grid; grid-template-columns: 1fr 1.1fr; gap: 64px; }
.process-list { border-top: 1px solid var(--ink); }
.process-list div { display: grid; grid-template-columns: 70px 1fr; gap: 18px; border-bottom: 1px solid var(--line); padding: 18px 0; }
.process-list span { color: var(--red); font-family: var(--mono); }
.process-list p { margin: 0; font-size: 20px; }

.page-hero { max-width: 1240px; margin: 0 auto; padding: 92px 24px 56px; border-bottom: 1px solid var(--line); }
.page-hero h1 { max-width: 1060px; }
.catalog-layout { max-width: 1240px; margin: 0 auto; padding: 38px 24px 92px; display: grid; grid-template-columns: 320px 1fr; gap: 34px; align-items: start; }
.catalog-rail { position: sticky; top: 96px; border-top: 1px solid var(--ink); }
.cat-group { border-bottom: 1px solid var(--line); }
.cat-button, .sub-button { width: 100%; text-align: left; background: transparent; border: 0; cursor: pointer; color: var(--ink); }
.cat-button { display: flex; gap: 12px; padding: 17px 0; font-weight: 700; font-size: 18px; }
.cat-button span { color: var(--red); font-family: var(--mono); }
.sub-list { display: none; padding: 0 0 12px 34px; }
.cat-group.active .sub-list { display: grid; gap: 4px; }
.sub-button { padding: 8px 0; color: var(--muted); }
.sub-button.active, .sub-button:hover { color: var(--red); }
.catalog-status { border-top: 1px solid var(--ink); padding-top: 18px; margin-bottom: 28px; }
.catalog-status h2 { margin-bottom: 12px; }
.product-output { display: grid; gap: 18px; }
.product-item { border-top: 1px solid var(--line); padding: 22px 0 0; display: grid; grid-template-columns: minmax(0, 1fr) 220px; gap: 24px; }
.product-item h3 { margin: 0 0 8px; font-size: clamp(22px, 2vw, 34px); line-height: 1.12; }
.product-code { display: inline-block; margin-left: 12px; color: var(--red); font-family: var(--mono); font-size: 14px; }
.product-desc { color: var(--muted); }
.product-tags, .spec-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.tag, .spec-pill { border: 1px solid var(--line); padding: 5px 8px; font-size: 12px; background: rgba(255,255,255,.28); }
.product-param { border-left: 2px solid var(--red); padding-left: 14px; }
.product-param small { color: var(--muted); display: block; }
.product-param strong { font-size: 20px; overflow-wrap: anywhere; }

.service-timeline { border-top: 1px solid var(--ink); }
.service-timeline article { display: grid; grid-template-columns: 110px minmax(220px, 360px) 1fr; gap: 24px; padding: 28px 0; border-bottom: 1px solid var(--line); }
.service-timeline article > span { color: var(--red); font-family: var(--mono); font-size: 20px; }
.service-timeline h2 { font-size: clamp(24px, 3vw, 40px); margin-bottom: 0; }
.service-timeline p { color: var(--muted); margin-bottom: 0; }
.about-grid-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.statement-block { border-top: 1px solid var(--ink); padding-top: 22px; }
.statement-block p { color: var(--muted); font-size: 18px; }
.info-ledger { border-top: 1px solid var(--ink); }
.info-ledger div { display: grid; grid-template-columns: 240px 1fr; gap: 24px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.info-ledger span { color: var(--muted); }
.info-ledger strong { font-size: 22px; overflow-wrap: anywhere; }
.contact-ledger { max-width: 1240px; margin: 0 auto; padding: 38px 24px 92px; border-top: 1px solid var(--ink); }
.contact-row { display: grid; grid-template-columns: 180px minmax(0, 1fr) 260px; gap: 24px; align-items: baseline; padding: 24px 0; border-bottom: 1px solid var(--line); text-decoration: none; }
.contact-row > span { color: var(--red); font-family: var(--mono); }
.contact-row strong { font-size: clamp(22px, 3vw, 38px); overflow-wrap: anywhere; }
.contact-row em { color: var(--muted); font-style: normal; }
.quote-notes { display: grid; grid-template-columns: .8fr 1fr; gap: 48px; }
.quote-notes ul { margin: 0; padding-left: 20px; }
.quote-notes li { margin-bottom: 12px; }

.site-footer { border-top: 1px solid var(--ink); background: var(--ink); color: var(--paper); }
.footer-inner { max-width: 1240px; margin: 0 auto; padding: 34px 24px; display: flex; justify-content: space-between; gap: 24px; }
.footer-inner p { margin: 0; }
.footer-inner a { color: var(--paper); }
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .45s ease, transform .45s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 900px) {
  .header-inner { padding: 0 16px; }
  .menu-toggle { display: inline-flex; flex-wrap: wrap; width: 92px; }
  .site-menu { position: absolute; top: 74px; left: 0; right: 0; display: none; background: var(--paper); border-bottom: 1px solid var(--ink); padding: 12px 16px 18px; flex-direction: column; align-items: stretch; }
  .site-menu.is-open { display: flex; }
  .site-menu a, .lang-toggle { border-color: var(--line); }
  .hero-shell { min-height: auto; grid-template-columns: 16px 1fr 16px; }
  .hero-copy, .hero-facts { grid-column: 2; padding: 56px 0 24px; }
  .hero-facts { padding-top: 0; }
  .section-heading, .split-layout, .catalog-layout, .service-timeline article, .about-grid-layout, .quote-notes { grid-template-columns: 1fr; }
  .catalog-rail { position: static; }
  .index-line { grid-template-columns: 56px 1fr; gap: 10px 16px; }
  .index-line em { grid-column: 2; }
  .product-item { grid-template-columns: 1fr; }
  .info-ledger div, .contact-row { grid-template-columns: 1fr; gap: 6px; }
  .footer-inner { display: grid; }
}

@media (max-width: 560px) {
  .brand img { width: 94px; }
  .brand-copy strong { font-size: 15px; }
  .brand-copy small { font-size: 10px; }
  h1 { font-size: 40px; }
  .section-pad, .page-hero, .contact-ledger { padding-left: 16px; padding-right: 16px; }
  .service-timeline article { grid-template-columns: 56px 1fr; }
  .service-timeline article p { grid-column: 2; }
}