:root {
  --bg: #ffffff;
  --surface: #f6f7f9;
  --border: #e3e6ea;
  --text: #14181d;
  --muted: #5c6672;
  --accent: #1f5eff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1116;
    --surface: #161b22;
    --border: #262d36;
    --text: #e8ecf1;
    --muted: #9aa5b1;
    --accent: #6f9bff;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
}

header {
  border-bottom: 1px solid var(--border);
  padding: 22px 0;
}

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

.brand {
  font-weight: 650;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--text);
}

nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 20px;
  font-size: 15px;
}

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

main { padding: 64px 0 80px; }

h1 {
  font-size: 34px;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
}

h2 {
  font-size: 19px;
  letter-spacing: -0.01em;
  margin: 40px 0 12px;
}

p { margin: 0 0 16px; }

.lead {
  font-size: 18px;
  color: var(--muted);
  margin-bottom: 32px;
}

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

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 22px;
  margin: 28px 0;
}

dl { margin: 0; }

dl div {
  display: flex;
  gap: 16px;
  padding: 7px 0;
  border-bottom: 1px solid var(--border);
}

dl div:last-child { border-bottom: 0; }

dt {
  color: var(--muted);
  min-width: 150px;
  font-size: 15px;
}

dd { margin: 0; }

ul { padding-left: 20px; margin: 0 0 16px; }
li { margin-bottom: 7px; }

footer {
  border-top: 1px solid var(--border);
  padding: 28px 0 44px;
  color: var(--muted);
  font-size: 14px;
}

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

.updated {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 32px;
}

@media (max-width: 560px) {
  h1 { font-size: 27px; }
  main { padding: 44px 0 56px; }
  dl div { flex-direction: column; gap: 2px; }
}