:root {
  color-scheme: light dark;
  --text: #1c1c1e;
  --muted: #55555c;
  --link: #0a5fd6;
  --card: rgba(255, 255, 255, 0.72);
  --edge: rgba(0, 0, 0, 0.08);
  --bg-a: #d6e6ff;
  --bg-b: #f5f8ff;
  --bg-c: #e4defc;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #f2f2f7;
    --muted: #ababb5;
    --link: #6eabff;
    --card: rgba(255, 255, 255, 0.08);
    --edge: rgba(255, 255, 255, 0.14);
    --bg-a: #0b1d40;
    --bg-b: #05070d;
    --bg-c: #17133d;
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  background-color: var(--bg-b);
}

body {
  margin: 0;
  min-height: 100vh;
  font: 17px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: linear-gradient(160deg, var(--bg-a), var(--bg-b) 55%, var(--bg-c)) fixed;
}

main {
  max-width: 40rem;
  margin: 0 auto;
  padding: 3rem 1.25rem 4rem;
}

.tiles {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.tiles span {
  width: 4.5rem;
  height: 4.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--edge);
  border-radius: 1.25rem;
  background: var(--card);
  color: var(--link);
  font-size: 2.25rem;
  font-weight: 700;
}

.tiles span:first-child {
  transform: translateY(-0.4rem);
}

.tiles span:last-child {
  transform: translateY(0.4rem);
}

h1 {
  margin: 0 0 1.5rem;
  font-size: 2rem;
  line-height: 1.2;
  text-align: center;
}

h2 {
  margin: 2.5rem 0 0.75rem;
  font-size: 1.5rem;
  line-height: 1.25;
}

h3 {
  margin: 1.75rem 0 0.5rem;
  font-size: 1.125rem;
}

p,
li {
  margin: 0 0 0.75rem;
}

ul {
  padding-left: 1.25rem;
}

a {
  color: var(--link);
}

.card {
  margin-bottom: 1.25rem;
  padding: 1.25rem 1.5rem 0.75rem;
  border: 1px solid var(--edge);
  border-radius: 1.25rem;
  background: var(--card);
}

.center {
  text-align: center;
}

.muted {
  color: var(--muted);
  font-size: 0.9375rem;
}

hr {
  margin: 3rem 0;
  border: 0;
  border-top: 1px solid var(--edge);
}