:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #666666;
  --accent: #2563eb;
  --border: #e5e7eb;
  --code-bg: #f3f4f6;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --fg: #e8eaed;
    --muted: #9aa0a6;
    --accent: #60a5fa;
    --border: #2a2e35;
    --code-bg: #1a1d23;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

header.site-header {
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 720px;
  margin: 0 auto;
}

header.site-header .brand {
  font-weight: 600;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--fg);
}

header.site-header nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 1rem;
  font-size: 0.92rem;
}

header.site-header nav a.active {
  color: var(--accent);
  font-weight: 500;
}

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

h1 {
  font-size: 2rem;
  line-height: 1.25;
  margin: 0 0 0.5rem;
}

h2 {
  font-size: 1.35rem;
  margin: 2.5rem 0 0.75rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}

h2:first-of-type {
  border-top: none;
  padding-top: 0;
}

h3 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.5rem;
}

p, ul, ol {
  margin: 0.75rem 0;
}

ul, ol {
  padding-left: 1.4rem;
}

li {
  margin: 0.35rem 0;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

strong {
  font-weight: 600;
}

code {
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 3px;
  font-family: ui-monospace, "SF Mono", Menlo, Monaco, Consolas, monospace;
  font-size: 0.92em;
}

.dates {
  color: var(--muted);
  font-size: 0.93rem;
  margin-bottom: 2rem;
}

.dates strong {
  color: var(--fg);
}

footer.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 3rem;
  padding-top: 1.25rem;
  color: var(--muted);
  font-size: 0.88rem;
  text-align: center;
}

footer.site-footer a {
  color: var(--muted);
}