:root {
  --fg: #1a1a1a;
  --bg: #fafafa;
  --muted: #555;
  --rule: #ddd;
  --accent: #1a4a8a;
  --code-bg: #f0f0f0;
  --code-fg: #2a2a2a;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e6e6e6;
    --bg: #141414;
    --muted: #a8a8a8;
    --rule: #333;
    --accent: #7ba9e0;
    --code-bg: #1f1f1f;
    --code-fg: #e0e0e0;
  }
}

* { box-sizing: border-box; }

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--fg);
  background: var(--bg);
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 4rem 1.5rem 6rem;
}

@media (min-width: 720px) {
  main { padding: 5rem 1.5rem 7rem; }
}

header {
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--rule);
}

header h1 {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 0.5rem;
}

header .tagline {
  font-size: 1.125rem;
  color: var(--muted);
  margin: 0;
  font-weight: 400;
}

h1, h2, h3, h4 {
  line-height: 1.3;
  letter-spacing: -0.01em;
  font-weight: 600;
}

h2 {
  font-size: 1.375rem;
  margin: 3rem 0 1rem;
  padding-top: 0.5rem;
}

h3 {
  font-size: 1.125rem;
  margin: 2rem 0 0.75rem;
}

h4 {
  font-size: 1rem;
  margin: 1.5rem 0 0.5rem;
}

p { margin: 0 0 1.25rem; }

ul, ol {
  padding-left: 1.5rem;
  margin: 0 0 1.25rem;
}

li { margin-bottom: 0.5rem; }

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s;
}

a:hover { border-bottom-color: var(--accent); }

hr {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 3rem 0;
}

blockquote {
  margin: 1.5rem 0;
  padding: 0.5rem 1.25rem;
  border-left: 3px solid var(--rule);
  color: var(--muted);
  font-style: italic;
}

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

pre {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 1rem 1.25rem;
  border-radius: 4px;
  overflow-x: auto;
  line-height: 1.5;
  font-size: 0.875rem;
  margin: 1.5rem 0;
}

pre code {
  background: none;
  padding: 0;
  font-size: inherit;
}

strong { font-weight: 600; }

em { font-style: italic; }

.nav {
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

.nav a {
  color: var(--muted);
  border-bottom: none;
}

.nav a:hover {
  color: var(--accent);
}

footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.9rem;
}

.byline {
  color: var(--muted);
  font-style: italic;
  margin-bottom: 2.5rem;
}

.article-meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: -0.5rem;
  margin-bottom: 2.5rem;
}