:root {
  color-scheme: light dark;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  background: #f7f8f7;
  color: #18201d;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 50% -10%, rgba(109, 173, 151, .2), transparent 34rem),
    #f7f8f7;
}

a { color: #236b56; }

.shell {
  width: min(820px, calc(100% - 36px));
  margin: 0 auto;
}

header,
footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding: 24px 0;
}

header a,
footer a { text-decoration: none; }

.brand {
  color: inherit;
  font-size: 20px;
  font-weight: 700;
}

nav,
footer div { display: flex; gap: 18px; }

main {
  padding: 52px 0 80px;
}

.hero {
  min-height: 54vh;
  display: grid;
  align-content: center;
}

h1 {
  max-width: 720px;
  margin: 0 0 18px;
  font-size: clamp(42px, 8vw, 72px);
  line-height: 1.04;
  letter-spacing: -.04em;
}

h2 { margin-top: 40px; }

p,
li {
  max-width: 72ch;
  color: #46534e;
  font-size: 17px;
  line-height: 1.72;
}

.lead { font-size: clamp(19px, 3vw, 24px); }

.card {
  margin-top: 36px;
  padding: 24px;
  border: 1px solid rgba(75, 102, 92, .2);
  border-radius: 22px;
  background: rgba(255, 255, 255, .72);
}

.updated,
footer { color: #68756f; font-size: 14px; }

@media (prefers-color-scheme: dark) {
  :root { background: #111614; color: #f4f7f5; }
  body {
    background:
      radial-gradient(circle at 50% -10%, rgba(88, 151, 130, .18), transparent 34rem),
      #111614;
  }
  a { color: #8bd3ba; }
  p, li { color: #bdc8c3; }
  .card { background: rgba(28, 37, 33, .82); border-color: #33443d; }
  .updated, footer { color: #93a099; }
}