:root {
  --primary: rgba(0, 94, 235, 1);
  --ink: #172033;
  --muted: #637083;
  --line: #d9e2f1;
  --panel: #ffffff;
  --soft: #f4f8ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: #f7faff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px clamp(20px, 5vw, 64px);
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
}

.brand {
  font-weight: 800;
  color: var(--ink);
}

nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 14px;
}

main {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.page {
  padding-top: 28px;
}

.hero {
  padding: 72px 0 56px;
}

.eyebrow {
  color: var(--primary);
  font-weight: 700;
}

h1 {
  margin: 0;
  font-size: clamp(44px, 8vw, 82px);
  line-height: 1;
  letter-spacing: 0;
}

h2 {
  margin: 0 0 8px;
  font-size: 26px;
}

h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.subtitle {
  margin: 20px 0 0;
  font-size: 24px;
  font-weight: 700;
}

.intro,
.section-head p,
.section p,
dd {
  color: var(--muted);
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border-radius: 6px;
  border: 1px solid var(--primary);
  font-weight: 700;
}

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

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

.section {
  margin: 0 0 28px;
  padding: 28px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.section-head {
  margin-bottom: 16px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

article {
  padding: 18px;
  background: var(--soft);
  border: 1px solid #e2ebfa;
  border-radius: 8px;
}

.code {
  overflow: auto;
  padding: 18px;
  color: #d8e7ff;
  background: #101b2d;
  border-radius: 8px;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 24px;
}

.version {
  font-size: 30px;
  font-weight: 800;
  color: var(--primary);
}

.runtime-list,
.doc-list {
  margin: 10px 0 0;
  padding-left: 20px;
}

dl {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 8px 18px;
}

dt {
  font-weight: 800;
}

footer {
  margin-top: 48px;
  padding: 28px;
  color: var(--muted);
  text-align: center;
  border-top: 1px solid var(--line);
}

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

  .hero {
    padding-top: 44px;
  }

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