@import url('https://fonts.googleapis.com/css2?family=Libertinus+Sans:wght@700&family=Libertinus+Serif:ital,wght@0,400;1,400&display=swap');

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

html {
  font-size: 18px;
}

body {
  font-family: 'Libertinus Serif', Georgia, serif;
  font-weight: 400;
  line-height: 1.8;
  color: #111;
  background: #fff;
  max-width: 640px;
  margin: 0 auto;
  padding: 4rem 1.5rem 6rem;
}

h1, h2, h3, h4 {
  font-family: 'Libertinus Sans', sans-serif;
  font-weight: 700;
  line-height: 1.25;
  color: #111;
}

h1 {
  font-size: 1.6rem;
  margin-bottom: 3rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #ddd;
}

h2 {
  font-size: 1.2rem;
  margin-bottom: 1rem;
}

h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

h4 {
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1rem;
  color: #111;
}

p:last-child {
  margin-bottom: 0;
}

strong {
  font-weight: 700;
}

em {
  font-style: italic;
}

a {
  color: #111;
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:hover {
  color: #555;
}

main > section {
  margin-bottom: 3.5rem;
  padding-bottom: 3.5rem;
  border-bottom: 1px solid #eee;
}

main > section:last-child {
  border-bottom: none;
}

article {
  margin-bottom: 1.5rem;
  padding-left: 1rem;
  border-left: 2px solid #ddd;
}

article:last-child {
  margin-bottom: 0;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1.5rem 0;
  filter: grayscale(100%);
}

header {
  margin-bottom: 3rem;
}

nav {
  margin-top: 1rem;
  display: flex;
  gap: 1.5rem;
}

ul {
  list-style: disc;
  margin-left: 2rem;
  margin-bottom: 1rem;
}