body {
  margin: 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  background: #0d1117;
  color: #c9d1d9;
}

header {
  background: #161b22;
  border-bottom: 1px solid #30363d;
  padding: 22px;
  text-align: center;
}

header h1 { margin: 0; }
header p { margin: 6px 0 0; color: #8b949e; }

main {
  max-width: 950px;
  margin: 0 auto;
  padding: 28px 18px;
}

section {
  background: #0f1520;
  border: 1px solid #30363d;
  border-radius: 14px;
  padding: 18px;
  margin-bottom: 18px;
}

h2 {
  margin: 0 0 12px;
  color: #58a6ff;
  font-size: 18px;
}

pre {
  margin: 0;
  padding: 14px;
  background: #161b22;
  border-left: 4px solid #58a6ff;
  overflow-x: auto;
  border-radius: 10px;
}

ul { margin: 0; padding-left: 18px; }
li { margin: 6px 0; }

footer {
  text-align: center;
  padding: 16px;
  border-top: 1px solid #30363d;
  color: #8b949e;
}