:root {
  --bg: #fbfbf9;
  --fg: #1d1d1b;
  --muted: #5c5c57;
  --accent: #0b5cad;
  --line: #dcdcd4;
  --code: #f0efe9;
  --card: #ffffff;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141413;
    --fg: #ecebe6;
    --muted: #a8a79f;
    --accent: #7db4ef;
    --line: #34342f;
    --code: #22221f;
    --card: #1b1b19;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 1rem/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.skip {
  position: absolute;
  left: -999px;
}

.skip:focus {
  left: 16px;
  top: 8px;
  background: var(--card);
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

header, main, footer {
  max-width: 46rem;
  margin: 0 auto;
  padding: 0 16px;
}

header nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  padding: 24px 0 16px;
  border-bottom: 1px solid var(--line);
}

header a { font-weight: 600; }

a { color: var(--accent); text-underline-offset: 3px; }

a[aria-current="page"] { color: var(--fg); text-decoration: none; }

a:focus-visible, .skip:focus { outline: 3px solid var(--accent); outline-offset: 2px; }

h1 {
  font-size: clamp(2rem, 6vw, 2.5rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 40px 0 16px;
}

h2 { font-size: 1.375rem; font-weight: 620; margin: 40px 0 8px; }

h3 { font-size: 1.1rem; margin: 24px 0 8px; }

p, li { max-width: 70ch; }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
  background: var(--code);
  border-radius: 4px;
  padding: 1px 4px;
}

pre {
  background: var(--code);
  border-radius: 8px;
  padding: 16px;
  overflow-x: auto;
}

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

table {
  display: block;
  overflow-x: auto;
  border-collapse: collapse;
  margin: 16px 0;
}

th, td {
  border: 1px solid var(--line);
  padding: 8px;
  text-align: left;
  vertical-align: top;
}

blockquote {
  margin: 16px 0;
  padding: 8px 16px;
  border-left: 3px solid var(--line);
  color: var(--muted);
}

img { max-width: 100%; height: auto; }

footer {
  margin-top: 64px;
  padding-bottom: 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}