:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #666;
  --link: #0066cc;
  --border: #e5e5e5;
  --code-bg: #f5f5f5;
  --max-width: 680px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1a1a;
    --fg: #f0f0f0;
    --muted: #999;
    --link: #4d9eff;
    --border: #333;
    --code-bg: #2a2a2a;
  }
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 2rem 1.25rem;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, system-ui, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
}

header {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

header h1 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

header nav {
  margin-left: auto;
  display: flex;
  gap: 1.25rem;
}

h2 {
  margin: 2.5rem 0 1rem;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.005em;
}

p {
  margin: 0 0 1rem;
}

a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

a:hover {
  text-decoration-thickness: 2px;
}

ul {
  padding-left: 1.25rem;
  margin: 0 0 1rem;
}

li {
  margin-bottom: 0.35rem;
}

code, kbd {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--muted);
}

footer p {
  margin: 0.25rem 0;
}