* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: #24292f;
  background: #f7f8fa;
  line-height: 1.7;
}

a {
  color: #0969da;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  background: #ffffff;
  border-bottom: 1px solid #d8dee4;
}

.wrap {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 24px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 20px;
}

.brand {
  font-size: 20px;
  font-weight: 700;
  color: #1f2328;
}

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

.hero {
  padding: 48px 0 36px;
  background: #ffffff;
  border-bottom: 1px solid #d8dee4;
}

.hero h1 {
  margin: 0 0 12px;
  font-size: 34px;
  line-height: 1.25;
  letter-spacing: 0;
}

.hero p {
  margin: 0;
  max-width: 760px;
  color: #57606a;
  font-size: 17px;
}

.main {
  padding: 32px 0 48px;
}

.section {
  background: #ffffff;
  border: 1px solid #d8dee4;
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 18px;
}

.section h2 {
  margin: 0 0 12px;
  font-size: 22px;
}

.section h3 {
  margin: 22px 0 8px;
  font-size: 18px;
}

.section p {
  margin: 0 0 12px;
}

.section ul,
.section ol {
  margin: 8px 0 0;
  padding-left: 22px;
}

.section li {
  margin: 6px 0;
}

.notice {
  border-left: 4px solid #0969da;
  padding: 10px 14px;
  background: #f6f8fa;
  color: #57606a;
}

.footer {
  border-top: 1px solid #d8dee4;
  background: #ffffff;
  color: #57606a;
  font-size: 13px;
  padding: 22px 0;
}

.footer-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

@media (max-width: 680px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 0;
  }

  .hero {
    padding: 34px 0 28px;
  }

  .hero h1 {
    font-size: 28px;
  }

  .section {
    padding: 20px;
  }
}