:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #171a1f;
  --muted: #5f6774;
  --primary: #2d5bff;
  --border: #e4e8ee;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

main {
  max-width: 860px;
  margin: 0 auto;
  padding: 32px 20px 72px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  margin-top: 16px;
}

h1,
h2 {
  margin-top: 0;
}

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

a:hover {
  text-decoration: underline;
}

.small {
  color: var(--muted);
  font-size: 14px;
}

ul {
  padding-left: 20px;
}

nav {
  display: flex;
  gap: 14px;
  margin-top: 10px;
  flex-wrap: wrap;
}