body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
  background: #f5f5f5;
  color: #222;
}
header {
  background: #24292e;
  color: #fff;
  padding: 2rem 1.5rem;
  text-align: center;
}
header h1 {
  margin: 0 0 0.5rem;
  font-size: 2rem;
}
header p {
  margin: 0.25rem 0;
  opacity: 0.9;
}
.buttons {
  margin-top: 1rem;
}
.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  margin: 0.25rem;
  text-decoration: none;
  border-radius: 4px;
  font-size: 0.95rem;
}
.btn-primary {
  background: #2da44e;
  color: #fff;
}
.btn-outline {
  border: 1px solid #fff;
  color: #fff;
}
main {
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1.5rem 3rem;
  background: #fff;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  border-radius: 6px;
}
section {
  margin-bottom: 2rem;
}
h2 {
  margin-top: 0;
  font-size: 1.4rem;
  border-bottom: 1px solid #eee;
  padding-bottom: 0.5rem;
}
ul {
  padding-left: 1.2rem;
}
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  background: #f3f3f3;
  padding: 0.1rem 0.25rem;
  border-radius: 3px;
  font-size: 0.9em;
}
pre {
  background: #0d1117;
  color: #e6edf3;
  padding: 1rem;
  overflow-x: auto;
  border-radius: 6px;
  font-size: 0.9rem;
}
pre code {
  background: transparent;
  padding: 0;
}
a {
  color: #0969da;
}
footer {
  text-align: center;
  font-size: 0.85rem;
  color: #666;
  padding: 1.5rem 1rem 2rem;
}