:root {
  color-scheme: light;
  --ink: #172026;
  --muted: #65717a;
  --line: #dbe3e6;
  --paper: #f7faf9;
  --white: #ffffff;
  --teal: #0f766e;
  --teal-dark: #0b4f4a;
  --coral: #d85d4f;
  --gold: #c79231;
  --blue: #285c8f;
  --shadow: 0 22px 60px rgba(23, 32, 38, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family:
    "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(20px, 5vw, 72px);
  background: rgba(247, 250, 249, 0.92);
  border-bottom: 1px solid rgba(219, 227, 230, 0.8);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  font-weight: 700;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  color: var(--white);
  background: linear-gradient(135deg, var(--teal), var(--blue));
  border-radius: 8px;
  font-size: 14px;
  letter-spacing: 0;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 22px;
  color: var(--muted);
  font-size: 14px;
}

.nav-links a:hover {
  color: var(--teal-dark);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(320px, 0.98fr);
  align-items: center;
  gap: clamp(28px, 5vw, 72px);
  min-height: calc(100vh - 78px);
  padding: clamp(54px, 7vw, 86px) clamp(20px, 5vw, 72px) 34px;
  background:
    linear-gradient(115deg, rgba(15, 118, 110, 0.11), transparent 44%),
    radial-gradient(circle at 80% 16%, rgba(216, 93, 79, 0.13), transparent 28%),
    var(--paper);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--teal);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(42px, 7vw, 88px);
  line-height: 1.04;
  letter-spacing: 0;
}

.hero-lede {
  max-width: 650px;
  margin: 24px 0 0;
  color: #40505a;
  font-size: clamp(17px, 2vw, 22px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 18px;
  border: 1px solid var(--teal);
  border-radius: 8px;
  font-weight: 700;
}

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

.button.secondary {
  color: var(--teal-dark);
  background: rgba(255, 255, 255, 0.72);
}

.hero-visual {
  min-height: 430px;
  padding: 18px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.94), rgba(231, 243, 241, 0.9)),
    repeating-linear-gradient(90deg, transparent 0 38px, rgba(15, 118, 110, 0.08) 39px 40px),
    repeating-linear-gradient(0deg, transparent 0 38px, rgba(15, 118, 110, 0.08) 39px 40px);
  border: 1px solid rgba(15, 118, 110, 0.16);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.visual-topline {
  display: flex;
  gap: 8px;
  height: 24px;
}

.visual-topline span {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--coral);
}

.visual-topline span:nth-child(2) {
  background: var(--gold);
}

.visual-topline span:nth-child(3) {
  background: var(--teal);
}

.system-map {
  position: relative;
  min-height: 364px;
}

.node {
  position: absolute;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 128px;
  min-height: 72px;
  padding: 12px;
  text-align: center;
  background: var(--white);
  border: 1px solid rgba(15, 118, 110, 0.18);
  border-radius: 8px;
  box-shadow: 0 12px 28px rgba(23, 32, 38, 0.08);
  font-weight: 700;
}

.node.core {
  top: 132px;
  left: 50%;
  width: 168px;
  min-height: 104px;
  transform: translateX(-50%);
  color: var(--white);
  background: linear-gradient(135deg, var(--teal-dark), var(--blue));
}

.node.core strong {
  font-size: 34px;
  line-height: 1;
}

.node.core small {
  color: rgba(255, 255, 255, 0.74);
}

.n1 {
  top: 18px;
  left: 8%;
}

.n2 {
  top: 16px;
  right: 7%;
}

.n3 {
  bottom: 20px;
  left: 8%;
}

.n4 {
  right: 7%;
  bottom: 18px;
}

.n5 {
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
}

.line {
  position: absolute;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(15, 118, 110, 0.55), transparent);
  transform-origin: center;
}

.l1 {
  top: 112px;
  left: 23%;
  width: 190px;
  transform: rotate(30deg);
}

.l2 {
  top: 112px;
  right: 23%;
  width: 190px;
  transform: rotate(-30deg);
}

.l3 {
  bottom: 126px;
  left: 24%;
  width: 182px;
  transform: rotate(-28deg);
}

.l4 {
  right: 24%;
  bottom: 126px;
  width: 182px;
  transform: rotate(28deg);
}

.stats-band {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin: 0 clamp(20px, 5vw, 72px);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
  transform: translateY(-12px);
}

.stats-band div {
  padding: 24px;
  background: var(--white);
}

.stats-band strong {
  display: block;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.2;
}

.stats-band span {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 14px;
}

.section,
.split-section,
.contact-section {
  padding: 78px clamp(20px, 5vw, 72px);
}

.section-heading {
  max-width: 780px;
  margin-bottom: 34px;
}

.section-heading.compact {
  margin-bottom: 0;
}

h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 50px);
  line-height: 1.16;
  letter-spacing: 0;
}

.section-heading p:not(.eyebrow),
.contact-section p {
  color: var(--muted);
  font-size: 17px;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.service-card {
  min-height: 270px;
  padding: 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.service-icon {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-bottom: 26px;
  color: var(--white);
  background: var(--coral);
  border-radius: 8px;
  font-weight: 800;
}

.service-card:nth-child(2) .service-icon {
  background: var(--teal);
}

.service-card:nth-child(3) .service-icon {
  background: var(--blue);
}

.service-card:nth-child(4) .service-icon {
  background: var(--gold);
}

.service-card h3,
.career-panel h3 {
  margin: 0 0 12px;
  font-size: 21px;
  line-height: 1.28;
}

.service-card p,
.career-panel p {
  margin: 0;
  color: var(--muted);
}

.split-section {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  gap: clamp(28px, 5vw, 70px);
  align-items: start;
  background: #eef5f3;
}

.profile-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  overflow: hidden;
  border: 1px solid rgba(15, 118, 110, 0.16);
  border-radius: 8px;
  background: rgba(15, 118, 110, 0.16);
}

.profile-list div {
  min-height: 116px;
  padding: 22px;
  background: var(--white);
}

.profile-list dt {
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 14px;
}

.profile-list dd {
  margin: 0;
  font-weight: 700;
}

.careers {
  background: var(--white);
}

.career-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(280px, 1.1fr);
  gap: 30px;
  align-items: center;
  padding: clamp(24px, 4vw, 40px);
  color: var(--white);
  background:
    linear-gradient(135deg, rgba(11, 79, 74, 0.96), rgba(40, 92, 143, 0.94)),
    linear-gradient(45deg, rgba(255, 255, 255, 0.1) 25%, transparent 25% 50%, rgba(255, 255, 255, 0.1) 50% 75%, transparent 75%);
  background-size: auto, 24px 24px;
  border-radius: 8px;
}

.career-panel p {
  color: rgba(255, 255, 255, 0.78);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.tag-list li {
  padding: 10px 14px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.92);
  border-radius: 8px;
  font-weight: 700;
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 420px);
  gap: 30px;
  align-items: center;
  background: #fff8ec;
}

address {
  display: grid;
  gap: 10px;
  padding: 24px;
  background: var(--white);
  border: 1px solid rgba(199, 146, 49, 0.28);
  border-radius: 8px;
  font-style: normal;
  box-shadow: 0 16px 40px rgba(199, 146, 49, 0.12);
}

address span {
  color: var(--muted);
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 24px clamp(20px, 5vw, 72px);
  color: rgba(255, 255, 255, 0.76);
  background: #172026;
  font-size: 14px;
}

.site-footer a {
  color: rgba(255, 255, 255, 0.84);
}

.site-footer a:hover {
  color: #ffffff;
}

@media (max-width: 980px) {
  .hero,
  .split-section,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .service-grid,
  .stats-band {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    justify-content: flex-start;
  }

  .hero {
    padding-top: 42px;
  }

  .hero-visual {
    min-height: 360px;
    padding: 14px;
  }

  .system-map {
    min-height: 306px;
  }

  .node {
    width: 106px;
    min-height: 58px;
    padding: 8px;
    font-size: 13px;
  }

  .node.core {
    top: 112px;
    width: 132px;
    min-height: 86px;
  }

  .node.core strong {
    font-size: 28px;
  }

  .l1,
  .l2,
  .l3,
  .l4 {
    width: 120px;
  }

  .stats-band,
  .service-grid,
  .profile-list,
  .career-panel {
    grid-template-columns: 1fr;
  }

  .section,
  .split-section,
  .contact-section {
    padding-top: 58px;
    padding-bottom: 58px;
  }
}