:root {
  color-scheme: light;
  --ink: #17202b;
  --muted: #5d6a78;
  --graphite: #1c2835;
  --steel-blue: #2d628f;
  --steel-light: #dce5eb;
  --steel-mid: #9baab5;
  --surface: #edf2f5;
  --paper: #f9fbfc;
  --line: rgba(23, 32, 43, 0.14);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(255, 255, 255, 0.76), rgba(255, 255, 255, 0.76)),
    repeating-linear-gradient(90deg, #f1f4f6 0, #f1f4f6 1px, transparent 1px, transparent 80px);
}

a {
  color: inherit;
}

.site-header {
  position: relative;
  z-index: 5;
  min-height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 14px 40px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 20px;
  letter-spacing: 0.02em;
}

.brand small {
  margin-top: 1px;
  color: var(--muted);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.brand-mark {
  position: relative;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 9px;
  background: linear-gradient(145deg, #3f5265, #14202d);
  box-shadow:
    inset 0 0 0 5px rgba(255, 255, 255, 0.06),
    0 6px 18px rgba(23, 32, 43, 0.16);
}

.brand-dot {
  position: absolute;
  inset: 10px;
  border: 2px solid #b8c8d4;
  border-radius: 5px;
}

.brand-dot::before,
.brand-dot::after {
  position: absolute;
  content: "";
  background: #b8c8d4;
}

.brand-dot::before {
  width: 2px;
  height: 18px;
  left: 8px;
  top: 0;
}

.brand-dot::after {
  width: 18px;
  height: 2px;
  left: 0;
  top: 8px;
}

nav {
  display: flex;
  gap: 28px;
  font-size: 14px;
}

nav a {
  text-decoration: none;
  padding: 8px 0;
  border-bottom: 1px solid transparent;
}

nav a:hover,
nav a:focus-visible {
  border-color: var(--steel-blue);
}

.hero {
  min-height: 640px;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(360px, 0.9fr);
  max-width: 1280px;
  margin: 0 auto;
  padding: 70px 40px 84px;
}

.hero-copy {
  align-self: center;
  max-width: 700px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 20px;
  color: var(--steel-blue);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 28px;
  font-size: clamp(48px, 6.1vw, 82px);
  line-height: 1.05;
  letter-spacing: -0.05em;
}

.hero-summary {
  max-width: 620px;
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.8;
}

.english {
  font-family: "Segoe UI", Arial, sans-serif;
}

.hero-summary.english {
  font-size: 15px;
  line-height: 1.7;
}

.primary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 24px;
  min-width: 164px;
  min-height: 50px;
  border-radius: 6px;
  color: white;
  background: var(--graphite);
  text-decoration: none;
  font-weight: 700;
}

.primary-action:hover,
.primary-action:focus-visible {
  background: var(--steel-blue);
}

.hero-visual {
  position: relative;
  overflow: hidden;
  min-height: 480px;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 26px;
  background:
    linear-gradient(rgba(255, 255, 255, 0.25), transparent 40%),
    repeating-linear-gradient(90deg, transparent 0 59px, rgba(38, 67, 91, 0.08) 60px),
    repeating-linear-gradient(0deg, transparent 0 59px, rgba(38, 67, 91, 0.08) 60px),
    linear-gradient(145deg, #dfe7ec, #aab8c2);
  box-shadow:
    inset 0 0 60px rgba(255, 255, 255, 0.65),
    0 28px 80px rgba(32, 51, 67, 0.14);
}

.orbit {
  position: absolute;
  border: 1px solid rgba(45, 98, 143, 0.2);
  border-radius: 50%;
}

.orbit-one {
  width: 520px;
  height: 520px;
  left: -120px;
  top: 60px;
}

.orbit-two {
  width: 340px;
  height: 340px;
  right: -100px;
  top: -90px;
}

/* 首页使用结构化笼具轮廓，表达专业制造属性，避免将概念图误认为真实产品。 */
.steel-cage {
  position: absolute;
  width: 250px;
  height: 230px;
  left: 50%;
  top: 47%;
  transform: translate(-50%, -50%);
  border: 12px solid #263746;
  border-radius: 6px;
  background:
    repeating-linear-gradient(90deg, transparent 0 18px, rgba(38, 55, 70, 0.82) 18px 22px),
    repeating-linear-gradient(0deg, transparent 0 36px, rgba(38, 55, 70, 0.64) 36px 40px),
    linear-gradient(145deg, rgba(255, 255, 255, 0.84), rgba(184, 197, 207, 0.58));
  box-shadow:
    12px 14px 0 rgba(45, 98, 143, 0.17),
    inset 0 0 0 4px rgba(255, 255, 255, 0.52);
}

.cage-top,
.cage-floor {
  position: absolute;
  left: -22px;
  width: 270px;
  height: 11px;
  border-radius: 3px;
  background: linear-gradient(90deg, #758897, #ecf2f5 42%, #516879);
}

.cage-top {
  top: -22px;
}

.cage-floor {
  bottom: -23px;
}

.cage-door {
  position: absolute;
  width: 112px;
  height: 190px;
  right: 17px;
  top: 8px;
  border: 4px solid #263746;
  background: rgba(241, 246, 248, 0.14);
}

.cage-handle {
  position: absolute;
  z-index: 2;
  width: 20px;
  height: 7px;
  right: 29px;
  top: 101px;
  border-radius: 2px;
  background: #263746;
}

.steel-badge {
  position: absolute;
  right: 28px;
  top: 28px;
  padding: 8px 10px;
  border: 1px solid rgba(28, 40, 53, 0.4);
  border-radius: 4px;
  color: var(--graphite);
  background: rgba(255, 255, 255, 0.48);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.visual-label {
  position: absolute;
  left: 32px;
  bottom: 30px;
  color: var(--graphite);
  font-size: 11px;
  letter-spacing: 0.16em;
  line-height: 1.5;
}

.visual-label strong {
  font-size: 15px;
}

.section {
  max-width: 1280px;
  margin: 0 auto;
  padding: 100px 40px;
}

.section h2 {
  margin-bottom: 0;
  font-size: clamp(34px, 4vw, 56px);
  line-height: 1.15;
  letter-spacing: -0.04em;
}

.about {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 80px;
  border-top: 1px solid var(--line);
}

.about-copy {
  align-self: end;
}

.about-copy p {
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 19px;
  line-height: 1.8;
}

.about-copy .english {
  font-size: 15px;
}

.business {
  max-width: none;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.8), rgba(220, 229, 235, 0.72)),
    var(--surface);
}

.business > * {
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.business-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 52px;
}

.business article {
  min-height: 280px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 14px 36px rgba(38, 55, 70, 0.06);
}

.business article > span {
  display: block;
  margin-bottom: 72px;
  color: var(--steel-blue);
  font-size: 12px;
  font-weight: 700;
}

.business h3 {
  margin-bottom: 12px;
  font-size: 24px;
}

.business article p {
  margin-bottom: 18px;
  color: var(--muted);
  line-height: 1.7;
}

.business article small {
  color: var(--steel-blue);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.contact {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 60px;
  align-items: end;
  max-width: none;
  color: white;
  background:
    linear-gradient(115deg, rgba(45, 98, 143, 0.22), transparent 42%),
    var(--graphite);
}

.contact > * {
  max-width: 760px;
}

.contact h2 {
  margin-bottom: 22px;
}

.contact p:not(.section-kicker) {
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.72);
}

.section-kicker.light {
  color: #8fc2e8;
}

.contact-domain {
  min-width: 300px;
  padding: 26px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 18px;
}

.contact-domain span,
.contact-domain strong,
.contact-domain small {
  display: block;
}

.contact-domain span,
.contact-domain small {
  color: rgba(255, 255, 255, 0.64);
  font-size: 11px;
  letter-spacing: 0.1em;
}

.contact-domain strong {
  margin: 8px 0 14px;
  color: #a8d7f5;
  font-size: 26px;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 40px;
  color: rgba(255, 255, 255, 0.58);
  background: #111a24;
  font-size: 12px;
}

@media (max-width: 860px) {
  .site-header {
    padding: 14px 22px;
  }

  nav {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 56px;
    padding: 54px 22px 70px;
  }

  .hero-visual {
    min-height: 420px;
  }

  .section {
    padding: 72px 22px;
  }

  .about,
  .contact {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .business-grid {
    grid-template-columns: 1fr;
  }

  .business article {
    min-height: 220px;
  }

  .business article > span {
    margin-bottom: 42px;
  }

  .contact-domain {
    min-width: 0;
  }

  footer {
    flex-direction: column;
    padding: 22px;
  }
}

@media (min-width: 861px) and (max-width: 1120px) {
  .business-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

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