:root {
  color-scheme: light;
  font-family: system-ui, sans-serif;
  color: #173044;
  background: #f3f7fa;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
}
header,
main,
footer {
  max-width: 900px;
  margin: auto;
  padding: 28px;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}
a {
  color: #00695e;
  text-underline-offset: 3px;
}
.brand {
  font-size: 26px;
  font-weight: 750;
  text-decoration: none;
  color: #123042;
}
.brand span {
  color: #008d7b;
}
main {
  background: white;
  border: 1px solid #dce5ec;
  border-radius: 16px;
  margin-bottom: 20px;
}
h1 {
  font-size: clamp(30px, 5vw, 42px);
  line-height: 1.15;
  margin-top: 12px;
}
h2 {
  font-size: 21px;
  margin-top: 32px;
}
p,
li {
  line-height: 1.7;
}
li {
  margin-bottom: 10px;
}
.intro {
  padding: 18px;
  background: #edf8f5;
  border-left: 4px solid #008d7b;
  border-radius: 4px;
}
.date,
footer {
  color: #536675;
  font-size: 14px;
}
nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}
@media (max-width: 600px) {
  header,
  main,
  footer {
    padding: 20px;
  }
  main {
    border-radius: 0;
  }
  header {
    align-items: flex-start;
    flex-direction: column;
  }
}