:root {
  color-scheme: light dark;
  --bg: #fafafa;
  --text: #1c1c1e;
  --muted: #6c6c70;
  --border: #e5e5ea;
  --code-bg: rgba(0, 0, 0, 0.06);
  --link: #0066cc;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1c1e;
    --text: #f2f2f7;
    --muted: #98989d;
    --border: #38383a;
    --code-bg: rgba(255, 255, 255, 0.1);
    --link: #0a84ff;
  }
}

* { box-sizing: border-box; }

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
               Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.65;
  max-width: 720px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
  color: var(--text);
  background: var(--bg);
  font-size: 16px;
}

header {
  margin-bottom: 2rem;
}

header a.brand {
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  color: var(--muted);
  text-decoration: none;
  text-transform: uppercase;
}

header a.brand:hover {
  color: var(--link);
}

h1 {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.25;
  margin: 0.75rem 0 0.5rem;
}

h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 2.25rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--border);
}

h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-top: 1.75rem;
}

p, ul, ol {
  margin: 0.85rem 0;
}

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

li {
  margin: 0.25rem 0;
}

li > p {
  margin: 0.25rem 0;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

code {
  background: var(--code-bg);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-family: "SF Mono", "Menlo", "Consolas", "Monaco", monospace;
  font-size: 0.88em;
}

pre {
  background: var(--code-bg);
  padding: 0.85rem 1rem;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.88em;
  line-height: 1.5;
}

pre code {
  background: none;
  padding: 0;
}

strong {
  font-weight: 600;
}

.meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0 0 1.5rem;
}

.meta strong {
  color: var(--text);
  font-weight: 500;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

footer {
  margin-top: 3.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

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

footer a:hover {
  color: var(--link);
}

footer .sep {
  opacity: 0.5;
}