:root {
  color-scheme: light;
  --bg: #f7f9fb;
  --surface: #ffffff;
  --ink: #162032;
  --muted: #5b6575;
  --line: #dfe6ee;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --soft: #eef4ff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}

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

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

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 16px 0;
}

.brand {
  font-size: 20px;
  font-weight: 750;
  letter-spacing: 0;
}

.nav-links {
  display: flex;
  gap: 22px;
  color: var(--muted);
  font-size: 15px;
}

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

.hero {
  display: grid;
  min-height: 480px;
  place-items: center;
  padding: 88px 16px;
  background:
    linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(14, 165, 233, 0.08)),
    linear-gradient(180deg, #ffffff 0%, #eef4ff 100%);
}

.hero-content {
  width: min(920px, 100%);
}

.eyebrow,
.section-kicker {
  margin: 0 0 10px;
  color: var(--primary-dark);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 780px;
  margin-bottom: 22px;
  font-size: clamp(42px, 7vw, 76px);
  line-height: 1.05;
  letter-spacing: 0;
}

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

.section {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 76px 0;
}

.section.muted {
  width: 100%;
  margin: 0;
  padding: 76px max(16px, calc((100% - 1120px) / 2));
  background: var(--surface);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-heading {
  max-width: 680px;
  margin-bottom: 28px;
}

h2 {
  margin-bottom: 12px;
  font-size: 32px;
  line-height: 1.25;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.card {
  min-height: 180px;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.card h3,
.timeline-item h3 {
  margin-bottom: 8px;
  font-size: 21px;
}

.card p,
.timeline-item p,
.about p,
.footer {
  color: var(--muted);
}

.timeline {
  display: grid;
  gap: 14px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 18px;
  align-items: start;
  padding: 22px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.timeline-item span {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  color: #ffffff;
  background: var(--primary);
  border-radius: 50%;
  font-weight: 750;
}

.about {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 36px;
  align-items: start;
  padding: 32px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.footer {
  padding: 28px 16px 36px;
  text-align: center;
  border-top: 1px solid var(--line);
}

.footer p {
  margin: 0;
}

.footer p + p {
  margin-top: 6px;
  font-size: 14px;
}

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

.footer a:hover,
.footer a:focus-visible {
  color: var(--primary);
}

@media (max-width: 760px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .nav-links {
    flex-wrap: wrap;
    gap: 12px 18px;
  }

  .hero {
    min-height: 420px;
    padding: 64px 16px;
  }

  h1 {
    font-size: 42px;
  }

  .hero-copy {
    font-size: 18px;
  }

  .grid,
  .about {
    grid-template-columns: 1fr;
  }

  .section,
  .section.muted {
    padding-top: 56px;
    padding-bottom: 56px;
  }
}