:root {
  --blue-950: #08172b;
  --blue-900: #0e2343;
  --blue-800: #17355f;
  --blue-700: #23497e;
  --blue-600: #2f629f;
  --red-500: #d62f37;
  --red-400: #ef4b43;
  --ink: #142033;
  --body: #344154;
  --muted: #72819a;
  --line: #dbe3ee;
  --soft: #f3f7fb;
  --paper: #fbfcfe;
  --white: #fff;
  --shadow: 0 26px 60px -36px rgba(8, 23, 43, .45);
  --radius: 18px;
  --wrap: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 0, rgba(214, 47, 55, .08), transparent 28%),
    radial-gradient(circle at 100% 20%, rgba(47, 98, 159, .12), transparent 30%),
    var(--paper);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.78;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
ul { margin: 0; padding-left: 18px; }
.wrap { width: min(calc(100% - 48px), var(--wrap)); margin-inline: auto; }

.site-head {
  position: sticky;
  z-index: 30;
  top: 0;
  background: rgba(8, 23, 43, .92);
  border-bottom: 1px solid rgba(255, 255, 255, .08);
  backdrop-filter: blur(16px);
}
.head-inner { min-height: 82px; display: flex; align-items: center; gap: 26px; }
.expo-brand { display: flex; align-items: center; gap: 14px; margin-right: auto; min-width: 0; }
.expo-mark {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  color: var(--white);
  background: linear-gradient(135deg, var(--red-500), var(--blue-600));
  font-weight: 900;
  letter-spacing: .08em;
}
.expo-copy { line-height: 1.22; color: var(--white); }
.expo-copy strong { display: block; font-size: 17px; }
.expo-copy small { display: block; color: rgba(255, 255, 255, .62); font-size: 11px; letter-spacing: .12em; }
.site-nav { display: flex; align-items: center; gap: 26px; color: rgba(255, 255, 255, .76); font-size: 14px; font-weight: 700; }
.site-nav a { padding: 28px 0; position: relative; }
.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 18px;
  height: 3px;
  background: linear-gradient(90deg, var(--red-400), var(--blue-600));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .2s ease;
}
.site-nav a:hover::after,
.site-nav a:focus-visible::after { transform: scaleX(1); }
.menu-btn {
  display: none;
  border: 0;
  padding: 8px 0;
  background: transparent;
  color: var(--white);
  font-weight: 800;
}

.hero {
  position: relative;
  overflow: hidden;
  color: var(--white);
  background:
    linear-gradient(120deg, rgba(8, 23, 43, .96), rgba(16, 35, 67, .9) 40%, rgba(24, 53, 95, .84) 100%);
}
.hero::before,
.hero::after {
  content: "";
  position: absolute;
  pointer-events: none;
}
.hero::before {
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .08) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .68), transparent 85%);
}
.hero::after {
  top: 86px;
  right: -120px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(214, 47, 55, .24), transparent 70%);
}
.hero-grid {
  position: relative;
  z-index: 1;
  min-height: 740px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 520px;
  gap: 44px;
  align-items: center;
  padding-top: 54px;
  padding-bottom: 64px;
}
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: #9fc8ff;
  font-family: "Avenir Next Condensed", "Arial Narrow", "DIN Alternate", sans-serif;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
}
.hero-kicker::before {
  content: "";
  width: 48px;
  height: 4px;
  background: linear-gradient(90deg, var(--red-400), #ffc067);
}
h1 {
  margin: 20px 0 18px;
  font-family: "Avenir Next Condensed", "Arial Narrow", "DIN Alternate", "PingFang SC", sans-serif;
  font-size: clamp(46px, 5.6vw, 78px);
  line-height: 1.05;
  letter-spacing: .01em;
}
.hero-en {
  margin: 0 0 22px;
  color: rgba(255, 255, 255, .72);
  font-family: "Avenir Next Condensed", "Arial Narrow", sans-serif;
  font-size: 20px;
  letter-spacing: .06em;
}
.hero-lead { max-width: 720px; margin: 0; color: rgba(255, 255, 255, .86); font-size: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.btn {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  border: 1px solid transparent;
  font-weight: 800;
  transition: .2s ease;
}
.btn:hover,
.btn:focus-visible { transform: translateY(-2px); }
.btn-primary { color: var(--white); background: linear-gradient(90deg, var(--red-500), var(--blue-600)); box-shadow: var(--shadow); }
.btn-secondary { color: var(--white); background: rgba(255, 255, 255, .08); border-color: rgba(255, 255, 255, .26); }
.btn-light { color: var(--blue-900); background: var(--white); }
.btn-dark { color: var(--white); background: rgba(8, 23, 43, .9); border-color: rgba(255, 255, 255, .18); }

.hero-points {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 36px;
}
.hero-points div {
  padding: 18px 20px;
  border: 1px solid rgba(255, 255, 255, .12);
  background: rgba(255, 255, 255, .06);
}
.hero-points strong {
  display: block;
  margin-bottom: 8px;
  color: #f6c7cb;
  font-size: 14px;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.hero-points span { color: rgba(255, 255, 255, .82); font-size: 15px; }

.hero-visual { position: relative; }
.hero-photo {
  margin: 0;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, .16);
  box-shadow: var(--shadow);
}
.hero-photo img { width: 100%; height: 620px; object-fit: cover; }
.logo-card {
  position: absolute;
  left: -32px;
  right: 42px;
  bottom: -36px;
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 18px;
  align-items: center;
  padding: 18px;
  color: var(--ink);
  background: rgba(255, 255, 255, .96);
  box-shadow: 0 28px 62px -36px rgba(0, 0, 0, .75);
}
.logo-card img { width: 100%; border: 1px solid var(--line); background: var(--white); }
.logo-card-text strong {
  display: block;
  margin-bottom: 10px;
  font-size: 23px;
  line-height: 1.28;
  color: var(--blue-900);
}
.logo-card-text span { display: block; color: var(--muted); font-size: 14px; line-height: 1.6; }

.metrics { position: relative; z-index: 2; background: linear-gradient(90deg, #fff, #f4f8fc); }
.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  margin-top: -1px;
  border: 1px solid var(--line);
  border-top: 0;
  background: var(--white);
}
.metric-card { padding: 30px; border-right: 1px solid var(--line); }
.metric-card:last-child { border-right: 0; }
.metric-card strong {
  display: block;
  color: var(--blue-900);
  font-family: "Avenir Next Condensed", "Arial Narrow", sans-serif;
  font-size: clamp(34px, 4vw, 48px);
  line-height: 1;
}
.metric-card span { display: block; margin-top: 8px; color: var(--red-500); font-size: 14px; font-weight: 800; }
.metric-card small { display: block; margin-top: 10px; color: var(--muted); font-size: 13px; line-height: 1.55; }

.section { padding: 84px 0; }
.section-head {
  display: grid;
  grid-template-columns: 360px minmax(0, 1fr);
  gap: 44px;
  align-items: end;
  margin-bottom: 26px;
}
.section-head-wide {
  display: block;
  max-width: none;
}
.section-kicker {
  color: var(--red-500);
  font-family: "Avenir Next Condensed", "Arial Narrow", sans-serif;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.section h2 {
  margin: 10px 0 0;
  color: var(--blue-900);
  font-family: "Avenir Next Condensed", "Arial Narrow", "DIN Alternate", "PingFang SC", sans-serif;
  font-size: clamp(34px, 4.1vw, 58px);
  line-height: 1.08;
}
.section-head p { margin: 0; color: var(--body); font-size: 17px; }

.profile-grid { display: grid; grid-template-columns: minmax(0, 1.08fr) .92fr; gap: 22px; align-items: stretch; }
.profile-copy {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 34px 36px;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.profile-logo {
  width: min(240px, 60%);
  margin: 0 auto 22px;
  padding: 12px;
  background: #fff;
}
.profile-logo img { width: 100%; height: auto; }
.profile-copy p { margin: 0 0 18px; color: var(--body); font-size: 16px; }
.profile-copy p:last-child { margin-bottom: 0; }
.profile-side { display: grid; gap: 22px; height: 100%; }
.side-panel {
  height: 100%;
  padding: 28px;
  color: var(--white);
  background: linear-gradient(180deg, var(--blue-900), var(--blue-800));
  box-shadow: var(--shadow);
}
.side-panel-title {
  margin-bottom: 18px;
  color: #ffcbcf;
  font-family: "Avenir Next Condensed", "Arial Narrow", sans-serif;
  font-size: 28px;
  font-weight: 800;
  letter-spacing: .04em;
}
.side-list { display: grid; gap: 16px; }
.side-list div { padding-top: 16px; border-top: 1px solid rgba(255, 255, 255, .12); }
.side-list b { display: block; margin-bottom: 8px; color: #fff; }
.side-list span { color: rgba(255, 255, 255, .76); font-size: 14px; }
.board-card {
  margin: 0;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.board-card img { width: 100%; height: auto; }
.board-card figcaption { padding: 14px 18px; color: var(--muted); font-size: 13px; }

.applications { background: linear-gradient(180deg, rgba(255,255,255,.22), rgba(207,220,236,.18)); }
.tab-shell {
  border: 1px solid var(--line);
  background: var(--white);
  box-shadow: var(--shadow);
}
.tab-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--line);
}
.tab-btn {
  border: 0;
  padding: 22px 18px;
  color: var(--muted);
  background: transparent;
  font-family: "Avenir Next Condensed", "Arial Narrow", "PingFang SC", sans-serif;
  font-size: 23px;
  font-weight: 800;
  cursor: pointer;
  transition: .2s ease;
}
.tab-btn + .tab-btn { border-left: 1px solid var(--line); }
.tab-btn.active { color: var(--white); background: linear-gradient(90deg, var(--red-500), var(--blue-700)); }
.tab-panel { display: none; padding: 26px; }
.tab-panel.active { display: block; }
.panel-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 24px; align-items: start; }
.panel-board {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--soft);
}
.panel-copy h3 {
  margin: 0 0 14px;
  color: var(--blue-900);
  font-family: "Avenir Next Condensed", "Arial Narrow", sans-serif;
  font-size: 34px;
}
.panel-copy p { margin: 0; color: var(--body); font-size: 16px; }
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 24px;
}
.chip-row span {
  padding: 10px 14px;
  color: var(--blue-900);
  background: var(--soft);
  border: 1px solid var(--line);
  font-size: 13px;
  font-weight: 800;
}
.photo-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.photo-row figure { margin: 0; }
.photo-row img { width: 100%; height: 200px; object-fit: cover; border: 1px solid var(--line); }
.photo-row figcaption { margin-top: 10px; color: var(--muted); font-size: 13px; }
.quote-box {
  padding: 18px 20px;
  color: var(--blue-900);
  background: linear-gradient(135deg, rgba(214,47,55,.06), rgba(47,98,159,.08));
  border-left: 4px solid var(--red-500);
  font-size: 15px;
}

.systems { background: var(--white); }
.system-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.system-card {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  padding: 22px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--white), #f7faff);
  box-shadow: var(--shadow);
}
.system-no {
  width: 74px;
  height: 74px;
  display: grid;
  place-items: center;
  color: var(--white);
  background: linear-gradient(135deg, var(--red-500), var(--blue-700));
  font-family: "Avenir Next Condensed", "Arial Narrow", sans-serif;
  font-size: 28px;
  font-weight: 900;
}
.system-copy h3 {
  margin: 0 0 10px;
  color: var(--blue-900);
  font-size: 25px;
  line-height: 1.25;
}
.system-copy p { margin: 0 0 14px; color: var(--body); font-size: 15px; }
.system-copy li { margin-bottom: 8px; color: var(--muted); font-size: 14px; }
.system-card img {
  grid-column: 1 / -1;
  width: 100%;
  border: 1px solid var(--line);
}

.products { background: linear-gradient(180deg, var(--paper), #eef4fb); }
.product-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.product-card {
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--white);
  box-shadow: var(--shadow);
}
.product-card figure { margin: 0; }
.product-card figure img { width: 100%; border-bottom: 1px solid var(--line); }
.product-copy { padding: 22px; }
.product-copy h3 {
  margin: 0 0 12px;
  color: var(--blue-900);
  font-size: 26px;
  line-height: 1.24;
}
.product-copy p { margin: 0; color: var(--body); font-size: 15px; }
.feature-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.feature-tags span {
  padding: 10px 12px;
  color: var(--red-500);
  background: rgba(214, 47, 55, .06);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .04em;
}

.contact-grid { display: grid; grid-template-columns: minmax(0, 1fr) 420px; gap: 28px; align-items: start; }
.contact-copy {
  padding: 34px 36px;
  border: 1px solid var(--line);
  background: var(--white);
  box-shadow: var(--shadow);
}
.contact-copy h2 { margin: 10px 0 14px; color: var(--blue-900); font-size: clamp(34px, 4vw, 52px); line-height: 1.06; }
.contact-copy p { margin: 0; color: var(--body); font-size: 16px; }
.contact-list { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 28px; }
.contact-item { padding-top: 16px; border-top: 1px solid var(--line); }
.contact-item span { display: block; color: var(--muted); font-size: 12px; }
.contact-item strong { display: block; margin-top: 7px; color: var(--ink); font-size: 15px; }
.contact-item a { color: var(--blue-700); }
.contact-side { display: grid; gap: 18px; }
.contact-photo { margin: 0; overflow: hidden; border: 1px solid var(--line); box-shadow: var(--shadow); }
.contact-photo img { width: 100%; height: 320px; object-fit: cover; }
.contact-panel {
  padding: 24px;
  color: var(--white);
  background: linear-gradient(180deg, var(--blue-900), var(--blue-800));
  box-shadow: var(--shadow);
}
.contact-panel h3 { margin: 0 0 12px; font-size: 24px; }
.contact-panel p { margin: 0; color: rgba(255, 255, 255, .8); font-size: 14px; }

.cta-band { padding: 92px 0; background: linear-gradient(120deg, var(--blue-900), var(--blue-700)); color: var(--white); }
.cta-inner { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 26px; align-items: center; }
.cta-inner h2 {
  margin: 0 0 12px;
  font-family: "Avenir Next Condensed", "Arial Narrow", "PingFang SC", sans-serif;
  font-size: clamp(34px, 4.2vw, 58px);
  line-height: 1.04;
}
.cta-inner p { margin: 0; color: rgba(255, 255, 255, .78); font-size: 16px; }
.cta-actions { display: flex; flex-wrap: wrap; gap: 12px; }

footer { padding: 38px 0; color: rgba(255,255,255,.72); background: #091624; font-size: 13px; }
.footer-grid { display: grid; grid-template-columns: 1.28fr .72fr; gap: 30px; align-items: end; }
footer strong { display: block; margin-bottom: 8px; color: var(--white); }
.footer-right { text-align: right; }
footer a { color: #9fc8ff; }

.backtop {
  position: fixed;
  z-index: 20;
  right: 20px;
  bottom: 20px;
  display: none;
  width: 52px;
  height: 52px;
  border: 0;
  border-radius: 50%;
  padding: 0;
  color: var(--white);
  background: linear-gradient(135deg, var(--red-500), var(--blue-700));
  font-size: 25px;
  font-weight: 800;
  line-height: 1;
  box-shadow: var(--shadow);
  cursor: pointer;
}
.backtop.show { display: block; }

@media (max-width: 1100px) {
  .site-nav { gap: 18px; font-size: 13px; }
  .hero-grid { grid-template-columns: 1fr; gap: 26px; min-height: auto; padding-bottom: 96px; }
  .hero-photo img { height: 520px; }
  .logo-card { left: 24px; right: 24px; bottom: -46px; }
  .metric-grid,
  .section-head,
  .profile-grid,
  .panel-grid,
  .system-grid,
  .product-grid,
  .contact-grid,
  .cta-inner,
  .footer-grid { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .menu-btn { display: block; }
  .site-nav {
    position: absolute;
    top: 82px;
    left: 0;
    right: 0;
    display: none;
    padding: 18px 24px 24px;
    background: rgba(8, 23, 43, .98);
    border-bottom: 1px solid rgba(255, 255, 255, .08);
  }
  .site-nav.open { display: grid; gap: 0; }
  .site-nav a { padding: 12px 0; }
  .site-nav a::after { display: none; }
  .hero-points,
  .contact-list,
  .photo-row { grid-template-columns: 1fr; }
  .tab-list { grid-template-columns: 1fr; }
  .tab-btn + .tab-btn { border-left: 0; border-top: 1px solid var(--line); }
}

@media (max-width: 650px) {
  .wrap { width: min(calc(100% - 32px), var(--wrap)); }
  .expo-copy strong { font-size: 14px; }
  .expo-copy small { display: none; }
  .section { padding: 62px 0; }
  h1 { font-size: 42px; }
  .hero-en { font-size: 16px; }
  .hero-lead { font-size: 16px; }
  .hero-actions, .cta-actions { display: grid; }
  .hero-photo img { height: 360px; }
  .logo-card {
    position: static;
    grid-template-columns: 1fr;
    margin-top: 18px;
  }
  .metric-card,
  .tab-panel,
  .profile-copy,
  .contact-copy { padding: 22px; }
  .panel-copy h3,
  .product-copy h3,
  .system-copy h3 { font-size: 24px; }
  .system-card { grid-template-columns: 1fr; }
  .system-no { width: 60px; height: 60px; font-size: 24px; }
  .footer-right { text-align: left; }
  .backtop.show { display: none; }
}