:root {
  color-scheme: light;
  --ink: #10211b;
  --muted: #52635c;
  --brand: #087f61;
  --surface: #ffffff;
  --background: #edf5f1;
  --border: #d6e4dd;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 17px;
  line-height: 1.65;
}

header {
  background: linear-gradient(135deg, #075f83, #08a7ac);
  color: #fff;
  padding: 28px 20px;
}

header div,
main,
footer div {
  width: min(880px, 100%);
  margin: 0 auto;
}

header a {
  color: #fff;
  font-size: 24px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-decoration: none;
}

main {
  margin: 32px auto;
  padding: 32px 40px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: 0 12px 35px rgb(24 67 52 / 8%);
}

h1 {
  margin-top: 0;
  font-size: clamp(32px, 5vw, 46px);
  line-height: 1.15;
}

h2 {
  margin-top: 32px;
  color: var(--brand);
  font-size: 24px;
  line-height: 1.3;
}

h3 {
  font-size: 19px;
}

a {
  color: #066c85;
}

.updated {
  color: var(--muted);
}

footer {
  padding: 10px 20px 36px;
  color: var(--muted);
}

footer a {
  margin-right: 18px;
}

@media (max-width: 640px) {
  main {
    margin: 0;
    padding: 26px 20px;
    border: 0;
    border-radius: 0;
  }
}