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

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: #000;
  background-color: #fff;
}

@media (prefers-color-scheme: dark) {
  html {
    color: #fff;
    background-color: #000;
  }
}

body {
  padding: 2rem;
}

main {
  max-width: 640px;
  margin: 0 auto;
}

header {
  margin-bottom: 3rem;
}

header > p {
  opacity: 0.7;
}

h1 {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

h2 {
  font-size: 1.125rem;
  font-weight: 500;
  margin-bottom: 0.25rem;
}

nav > p {
  opacity: 0.7;
  margin-bottom: 1.5rem;
}

nav ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

a {
  color: currentColor;
  text-decoration: underline;
  padding: 0.5rem;
  border-radius: 2px;
}

a:hover {
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

a:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 2px;
}

@media (prefers-reduced-motion: no-preference) {
  a {
    transition: text-decoration-thickness 150ms, text-underline-offset 150ms;
  }
}