:root {
  color-scheme: light;
  --text: #172033;
  --muted-text: #5f6b7a;
  --line: #d8dee8;
  --brand: #0f766e;
  --brand-dark: #115e59;
  --accent: #c2410c;
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-soft: #eef6f5;
  --shadow: 0 18px 48px rgba(23, 32, 51, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei",
    sans-serif;
  line-height: 1.6;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(20px, 5vw, 72px);
  border-bottom: 1px solid rgba(216, 222, 232, 0.8);
  background: rgba(248, 250, 252, 0.94);
  backdrop-filter: blur(12px);
}

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

.brand-mark {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border-radius: 8px;
  background: var(--brand);
  color: #fff;
  font-size: 14px;
  letter-spacing: 0;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 26px;
  color: var(--muted-text);
  font-size: 15px;
}

.site-nav a:hover,
.beian-link:hover {
  color: var(--brand);
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  padding: 8px 12px;
  font: inherit;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.65fr);
  gap: clamp(32px, 6vw, 80px);
  align-items: center;
  min-height: calc(100vh - 77px);
  padding: clamp(56px, 8vw, 112px) clamp(20px, 5vw, 72px);
  background:
    linear-gradient(120deg, rgba(15, 118, 110, 0.08), transparent 48%),
    linear-gradient(180deg, #fff, var(--bg));
}

.hero-content {
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
}

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

h1 {
  max-width: 760px;
  margin-bottom: 24px;
  font-size: clamp(42px, 7vw, 78px);
  line-height: 1.08;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.18;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 21px;
  letter-spacing: 0;
}

.hero-text {
  max-width: 680px;
  color: var(--muted-text);
  font-size: 19px;
}

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

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  padding: 10px 20px;
  font-weight: 700;
}

.button.primary {
  background: var(--brand);
  color: #fff;
}

.button.primary:hover {
  background: var(--brand-dark);
}

.button.secondary {
  border: 1px solid var(--line);
  background: var(--surface);
}

.hero-panel {
  display: grid;
  gap: 14px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.metric {
  padding: 18px;
  border-radius: 8px;
  background: var(--surface-soft);
}

.metric strong,
.metric span {
  display: block;
}

.metric strong {
  margin-bottom: 6px;
  font-size: 20px;
}

.metric span,
.card p,
.solution-list p,
.two-column p,
.contact-section p {
  color: var(--muted-text);
}

.section {
  padding: clamp(56px, 8vw, 96px) clamp(20px, 5vw, 72px);
}

.section-heading {
  max-width: 720px;
  margin-bottom: 32px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.card {
  min-height: 210px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.muted {
  background: var(--surface-soft);
}

.solution-list {
  display: grid;
  gap: 18px;
}

.solution-list > div {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
  padding: 22px 0;
  border-bottom: 1px solid rgba(23, 32, 51, 0.12);
}

.two-column,
.contact-section {
  display: grid;
  grid-template-columns: minmax(240px, 0.5fr) minmax(0, 1fr);
  gap: clamp(28px, 6vw, 80px);
}

.contact-card {
  display: grid;
  gap: 10px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font-style: normal;
}

.site-footer {
  display: grid;
  justify-items: center;
  gap: 8px;
  padding: 28px 20px 34px;
  border-top: 1px solid var(--line);
  background: #fff;
  color: var(--muted-text);
  text-align: center;
  font-size: 14px;
}

.site-footer p {
  margin-bottom: 0;
}

.beian-link {
  color: var(--muted-text);
}

@media (max-width: 880px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    right: 20px;
    left: 20px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--surface);
    box-shadow: var(--shadow);
  }

  .site-nav.open {
    display: flex;
  }

  .site-nav a {
    padding: 14px 16px;
    border-bottom: 1px solid var(--line);
  }

  .site-nav a:last-child {
    border-bottom: 0;
  }

  .hero,
  .two-column,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

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

  .solution-list > div {
    grid-template-columns: 1fr;
    gap: 6px;
  }
}

@media (max-width: 520px) {
  .site-header {
    padding-inline: 16px;
  }

  .brand {
    gap: 10px;
    font-size: 15px;
  }

  .hero,
  .section {
    padding-inline: 16px;
  }

  h1 {
    font-size: 38px;
  }

  .hero-text {
    font-size: 17px;
  }
}