:root {
  --bg: #ffffff;
  --fg: #1d2129;
  --muted: #5a6270;
  --accent: #1f5fbf;
  --border: #dde1e7;
  --code-bg: #f4f6f8;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171c;
    --fg: #e4e7ec;
    --muted: #9aa3b0;
    --accent: #7fb0ff;
    --border: #2c323b;
    --code-bg: #1d2128;
  }
}

* { box-sizing: border-box; }

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

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 16px;
}

a { color: var(--accent); }

header {
  border-bottom: 1px solid var(--border);
}

header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 14px;
  padding-bottom: 14px;
}

.brand {
  margin: 0;
  font-weight: 700;
  font-size: 1.1rem;
}

nav a {
  margin-left: 18px;
  text-decoration: none;
}

nav a:hover { text-decoration: underline; }

.hero { padding: 40px 0 8px; }

h1 {
  font-size: 2rem;
  line-height: 1.25;
  margin: 0 0 16px;
}

.lede { font-size: 1.1rem; }

h2 {
  font-size: 1.35rem;
  margin: 40px 0 12px;
}

h3 {
  font-size: 1.05rem;
  margin: 0 0 8px;
}

li { margin-bottom: 8px; }

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

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px 16px;
  overflow-x: auto;
  line-height: 1.45;
}

pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
}

.cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.card {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 16px;
}

.card p { margin: 0; color: var(--muted); }

footer {
  border-top: 1px solid var(--border);
  margin-top: 48px;
  color: var(--muted);
  font-size: 0.9rem;
}

footer .wrap { padding-top: 8px; padding-bottom: 8px; }

@media (max-width: 600px) {
  h1 { font-size: 1.6rem; }
  .cols { grid-template-columns: 1fr; }
}