:root {
  color-scheme: light dark;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
  background-color: #111;
  color: #f5f5f5;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0 1.5rem 2rem;
  max-width: 60rem;
  margin-left: auto;
  margin-right: auto;
  background-color: #111;
}

header, nav, main, footer, article {
  margin-bottom: 1.5rem;
}

header h1 {
  margin-bottom: 0.2rem;
}

nav ul {
  list-style: none;
  padding: 0;
  display: flex;
  gap: 1rem;
}

nav a {
  color: #ffd166;
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

nav a:hover,
nav a:focus {
  border-bottom-color: #ffd166;
}

article {
  background: #1b1b1b;
  padding: 1rem;
  border-radius: 0.4rem;
}

article h2 {
  margin-top: 0;
}

ul {
  padding-left: 1.25rem;
}

a {
  color: #8ecae6;
}

a:focus-visible {
  outline: 2px solid #8ecae6;
  outline-offset: 2px;
}

footer {
  font-size: 0.9rem;
  border-top: 1px solid #333;
  padding-top: 1rem;
}