:root {
  --bg: #fff;
  --fg: #111;
  --muted: #555;
  --accent: #0969da;
  --border: #ddd;
  --code-bg: #f6f8fa;
  --card-bg: #fafbfc;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --fg: #c9d1d9;
    --muted: #8b949e;
    --accent: #58a6ff;
    --border: #30363d;
    --code-bg: #161b22;
    --card-bg: #161b22;
  }
}
* { box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  margin: 0;
  padding: 0;
}
nav {
  background: var(--code-bg);
  padding: 0.75rem 1.5rem;
  border-bottom: 1px solid var(--border);
}
nav a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}
main {
  max-width: 64rem;
  margin: 2rem auto;
  padding: 0 1.5rem;
}
h1, h2, h3 { margin-top: 1.5rem; }
a { color: var(--accent); }
code {
  background: var(--code-bg);
  padding: 0.15em 0.35em;
  border-radius: 4px;
  font-size: 0.9em;
}
pre {
  background: var(--code-bg);
  padding: 1rem;
  overflow-x: auto;
  border-radius: 6px;
}
pre code { background: none; padding: 0; }
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}
th, td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.75rem;
  text-align: left;
}
th { background: var(--code-bg); }
ul { padding-left: 1.25rem; }

/* Cards layout */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
}
.card h2 {
  margin-top: 0;
  font-size: 1.25rem;
}
.card p {
  color: var(--muted);
  margin: 0.5rem 0 1rem;
}
.card ul {
  margin: 0;
  padding-left: 1.25rem;
}
.card li {
  margin: 0.4rem 0;
}

/* Steps */
.steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
}
.steps li {
  counter-increment: step;
  padding-left: 2.5rem;
  position: relative;
  margin-bottom: 1rem;
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  width: 1.75rem;
  height: 1.75rem;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  text-align: center;
  line-height: 1.75rem;
  font-weight: 600;
  font-size: 0.9rem;
}