:root {
  --fg: #1f2328;
  --muted: #656d76;
  --line: #d0d7de;
  --bg: #ffffff;
  --soft: #f6f8fa;
  --accent: #0969da;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e6edf3;
    --muted: #8b949e;
    --line: #30363d;
    --bg: #0d1117;
    --soft: #161b22;
    --accent: #58a6ff;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--fg);
  background: var(--bg);
}

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--line);
}

.brand { font-weight: 600; color: var(--fg); text-decoration: none; }

nav a {
  margin-left: 16px;
  color: var(--muted);
  text-decoration: none;
}
nav a:hover { color: var(--accent); }

main {
  max-width: 820px;
  margin: 0 auto;
  padding: 24px;
}

section { margin-bottom: 32px; }

h1 { font-size: 28px; line-height: 1.25; margin: 16px 0; }
h2 { font-size: 20px; margin: 24px 0 8px; }

a { color: var(--accent); }

code, pre {
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 14px;
}

pre {
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  overflow-x: auto;
}

.muted { color: var(--muted); }

.button {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 8px;
  background: var(--accent);
  color: #ffffff;
  text-decoration: none;
  font-weight: 500;
}

footer {
  max-width: 820px;
  margin: 0 auto;
  padding: 16px 24px 32px;
  border-top: 1px solid var(--line);
}