* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.65;
  color: #222;
  background: #0d1117;
  color: #d0d7de;
  font-size: 16px;
}
a { color: #58a6ff; text-decoration: none; }
a:hover { text-decoration: underline; }

.site-header {
  background: #161b22;
  border-bottom: 1px solid #30363d;
  padding: 14px 20px;
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-header .wrap {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}
.site-header .logo {
  font-weight: 700;
  font-size: 20px;
  color: #fff;
}
.site-header nav a {
  margin-left: 16px;
  font-size: 14px;
  color: #8b949e;
}
.site-header nav a:hover { color: #58a6ff; }

main {
  max-width: 860px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}
h1 {
  font-size: 32px;
  line-height: 1.25;
  margin-bottom: 16px;
  color: #fff;
}
h2 {
  font-size: 22px;
  margin: 32px 0 12px;
  color: #f0f6fc;
  border-bottom: 1px solid #30363d;
  padding-bottom: 6px;
}
h3 {
  font-size: 18px;
  margin: 20px 0 8px;
  color: #e6edf3;
}
p { margin: 12px 0; }
ul, ol { margin: 12px 0 12px 24px; }
li { margin: 6px 0; }

.lead {
  font-size: 17px;
  color: #8b949e;
  margin-bottom: 24px;
}
.callout {
  background: #1f2937;
  border-left: 4px solid #f59e0b;
  padding: 14px 18px;
  margin: 20px 0;
  border-radius: 4px;
  color: #fcd34d;
}
.callout strong { color: #fbbf24; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 15px;
}
th, td {
  border: 1px solid #30363d;
  padding: 8px 12px;
  text-align: left;
}
th { background: #161b22; color: #f0f6fc; }
tr:nth-child(even) td { background: #161b22; }

.related {
  background: #161b22;
  border: 1px solid #30363d;
  border-radius: 8px;
  padding: 20px 24px;
  margin-top: 40px;
}
.related h2 { border: none; margin-top: 0; }
.related ul { list-style: none; margin-left: 0; }
.related li { margin: 8px 0; }
.related li::before { content: "→ "; color: #58a6ff; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  margin: 24px 0;
}
.card {
  background: #161b22;
  border: 1px solid #30363d;
  border-radius: 8px;
  padding: 20px;
  transition: border-color .2s;
}
.card:hover { border-color: #58a6ff; }
.card h3 { margin-top: 0; }
.card p { font-size: 14px; color: #8b949e; }

footer {
  border-top: 1px solid #30363d;
  padding: 24px 20px;
  text-align: center;
  color: #8b949e;
  font-size: 13px;
}
footer a { color: #8b949e; }

code {
  background: #21262d;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 14px;
  color: #f0f6fc;
}