:root {
  color: #172033;
  background: #f5f8ff;
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #f5f8ff;
  color: #172033;
  line-height: 1.75;
}

a {
  color: #1d4ed8;
  text-underline-offset: 3px;
}

.page-shell {
  width: min(980px, calc(100% - 40px));
  margin: 0 auto;
  padding: 34px 0 64px;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 0 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #172033;
  font-size: 20px;
  font-weight: 900;
  text-decoration: none;
}

.brand-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: 1px solid #bfd4ff;
  border-radius: 8px;
  background: #eaf2ff;
  color: #2563eb;
}

.site-nav {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 14px;
  font-weight: 700;
}

.site-nav a {
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  padding: 0 10px;
  border: 1px solid transparent;
  border-radius: 8px;
  text-decoration: none;
  white-space: nowrap;
}

.site-nav a:hover {
  border-color: #bfd4ff;
  background: #eaf2ff;
}

.site-nav a[aria-current="page"] {
  border-color: #bfd4ff;
  background: white;
  color: #172033;
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.1);
}

.hero {
  padding: 52px 0 42px;
  border-top: 1px solid #d8e4ff;
  border-bottom: 1px solid #d8e4ff;
}

.kicker {
  margin: 0 0 10px;
  color: #2563eb;
  font-size: 14px;
  font-weight: 900;
}

h1 {
  max-width: 820px;
  margin: 0;
  font-size: clamp(36px, 6vw, 64px);
  line-height: 1.08;
  letter-spacing: 0;
}

.lead {
  max-width: 760px;
  margin: 22px 0 0;
  color: #4b5870;
  font-size: 19px;
}

.section {
  padding: 42px 0 0;
}

.section h2 {
  margin: 0 0 16px;
  font-size: 28px;
  line-height: 1.25;
}

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

.card {
  min-height: 150px;
  padding: 20px;
  border: 1px solid #d8e4ff;
  border-radius: 8px;
  background: white;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 19px;
}

.card p,
.section li {
  color: #536075;
}

.list {
  display: grid;
  gap: 12px;
  padding-left: 20px;
}

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

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