:root {
  --bg: #ffffff;
  --text: #1a1d21;
  --muted: #5c6470;
  --accent: #0f6fde;
  --accent-contrast: #ffffff;
  --surface: #f4f6f8;
  --border: #e2e6ea;
  --max-width: 42rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15181c;
    --text: #e8eaed;
    --muted: #9aa3ad;
    --accent: #4d9fff;
    --accent-contrast: #10131a;
    --surface: #1d2126;
    --border: #2c3238;
  }
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

header.site,
main,
footer.site {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

header.site {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
}

.brand {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  color: var(--text);
  text-decoration: none;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 1.25rem;
  font-size: 0.95rem;
}

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

main {
  padding-top: 2.5rem;
  padding-bottom: 4rem;
}

h1 {
  font-size: 2rem;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 1rem;
}

h2 {
  font-size: 1.3rem;
  letter-spacing: -0.01em;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
}

h3 {
  font-size: 1.05rem;
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1rem;
}

.lead {
  font-size: 1.15rem;
  color: var(--muted);
  margin-bottom: 2rem;
}

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

ul {
  padding-left: 1.4rem;
  margin-bottom: 1rem;
}

li {
  margin-bottom: 0.35rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
}

.card h3 {
  margin-top: 0;
}

.muted {
  color: var(--muted);
}

.small {
  font-size: 0.9rem;
}

footer.site {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
  padding-bottom: 2.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

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