:root {
  color-scheme: light dark;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0 20px 72px;
  color: #17191d;
  background: #fbfaf8;
  font-size: 17px;
  line-height: 1.65;
}

main {
  width: min(720px, 100%);
  margin: 0 auto;
}

header { padding: 44px 0 10px; }

.brand {
  margin: 0 0 6px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: #176a63;
}

h1 {
  margin: 0 0 8px;
  font-size: 31px;
  line-height: 1.2;
}

h2 {
  margin: 30px 0 8px;
  font-size: 20px;
  line-height: 1.3;
}

p, li { max-width: 70ch; }

.meta {
  margin: 0 0 28px;
  font-size: 14px;
  opacity: .65;
}

.card {
  margin: 20px 0;
  padding: 16px 18px;
  border: 1px solid #dfddd7;
  border-radius: 14px;
  background: #fff;
}

a { color: #11645d; }

nav {
  margin-top: 40px;
  font-size: 15px;
}

nav a { margin-right: 16px; }

footer {
  margin-top: 44px;
  font-size: 14px;
  opacity: .64;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: .9em;
}

@media (prefers-color-scheme: dark) {
  body {
    color: #eceef0;
    background: #121417;
  }

  .card {
    background: #1b1e22;
    border-color: #30343a;
  }

  .brand, a { color: #6fd0c5; }
}