:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #5b6475;
  --line: #d9dfec;
  --paper: #f6f8fb;
  --white: #ffffff;
  --brand: #176b87;
  --brand-strong: #0f4e67;
  --accent: #d88428;
  --green: #28745f;
  --shadow: 0 18px 50px rgba(23, 32, 51, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
}

body {
  margin: 0;
}

a {
  color: var(--brand-strong);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(217, 223, 236, 0.9);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
}

.nav {
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: var(--ink);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  color: #fff;
  background: var(--brand);
}

.nav-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  justify-content: flex-end;
  font-size: 15px;
}

.hero,
.section {
  max-width: 1120px;
  margin: 0 auto;
  padding: 68px 20px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  align-items: center;
  gap: 34px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--green);
  font-weight: 800;
}

h1,
h2,
h3 {
  line-height: 1.18;
  margin: 0;
}

h1 {
  max-width: 760px;
  font-size: clamp(36px, 6vw, 64px);
  letter-spacing: 0;
}

h2 {
  font-size: 32px;
  margin-bottom: 18px;
}

h3 {
  font-size: 21px;
  margin-bottom: 8px;
}

.lead {
  margin: 20px 0 0;
  max-width: 720px;
  color: var(--muted);
  font-size: 20px;
}

.actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 18px;
  border-radius: 8px;
  border: 1px solid var(--brand);
  font-weight: 800;
}

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

.button.secondary {
  background: #fff;
}

.hero-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: var(--shadow);
  padding: 24px;
}

.metric-grid,
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.version-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.metric,
.card,
.faq-item,
.version-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  padding: 20px;
}

.version-card {
  min-height: 260px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background:
    linear-gradient(135deg, rgba(23, 107, 135, 0.08), rgba(216, 132, 40, 0.08)),
    var(--white);
  box-shadow: 0 14px 38px rgba(23, 32, 51, 0.08);
}

.version-card small {
  color: var(--muted);
  font-weight: 800;
}

.metric strong {
  display: block;
  font-size: 30px;
  color: var(--brand-strong);
  line-height: 1.1;
}

.metric span,
.card p,
.faq-item p,
.section-intro,
.list {
  color: var(--muted);
}

.region-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.region-card {
  min-height: 220px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  padding: 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0;
}

.tag {
  border: 1px solid #c9d7dc;
  border-radius: 999px;
  padding: 4px 10px;
  color: var(--brand-strong);
  background: #eef7f9;
  font-size: 13px;
}

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

.list {
  margin: 0;
  padding-left: 20px;
}

.faq {
  display: grid;
  gap: 12px;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--white);
}

.footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 28px 20px;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 820px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

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

  .hero,
  .two-col {
    grid-template-columns: 1fr;
  }

  .metric-grid,
  .card-grid,
  .version-grid,
  .region-list {
    grid-template-columns: 1fr;
  }

  .hero,
  .section {
    padding: 46px 18px;
  }
}