:root {
  color-scheme: dark;
  font-family: system-ui, sans-serif;
  color: #eef0ff;
  background: #101426;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background:
    radial-gradient(ellipse at top right, #30234b88, transparent 60%), #101426;
}
a {
  color: #72ead0;
  text-underline-offset: 4px;
}
a:focus-visible {
  outline: 3px solid #ffc36b;
  outline-offset: 5px;
}
header,
main,
footer {
  width: min(900px, 100%);
  margin: auto;
  padding: 24px;
}
header {
  display: flex;
  gap: 20px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}
header a {
  font-weight: 700;
}
nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}
h1 {
  font-size: clamp(32px, 6vw, 56px);
  line-height: 1.1;
  letter-spacing: -0.04em;
}
h2 {
  font-size: 26px;
  margin-top: 38px;
}
h3 {
  font-size: 20px;
}
p,
li,
dd {
  font-size: 18px;
  line-height: 1.75;
}
li {
  margin: 12px 0;
}
section {
  margin: 28px 0;
}
strong {
  color: #fff;
}
.lead {
  color: #c4cbe1;
  font-size: 21px;
}
.card {
  background: #20263e;
  border: 1px solid #3d4964;
  border-radius: 20px;
  padding: 24px;
}
.cta {
  display: inline-block;
  background: #55ddba;
  color: #101426;
  padding: 14px 22px;
  border-radius: 12px;
  font-weight: 700;
  text-decoration: none;
}
dt {
  font-weight: 700;
  color: #72ead0;
  font-size: 20px;
  margin-top: 20px;
}
dd {
  margin: 8px 0 22px;
}
footer {
  border-top: 1px solid #3d4964;
  margin-top: 40px;
  font-size: 14px;
}
footer nav {
  margin-top: 18px;
}
.board {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 4px;
  width: min(280px, 100%);
  margin: 20px auto;
}
.board span {
  aspect-ratio: 1;
  border-radius: 4px;
  background: #36415e;
}
.board .filled {
  background: #55ddba;
}
.board .gap {
  outline: 2px dashed #ffcb79;
  outline-offset: -2px;
}
.caption {
  font-size: 16px;
  color: #c4cbe1;
  text-align: center;
}
@media (max-width: 480px) {
  header,
  main,
  footer {
    padding: 20px;
  }
  .card {
    padding: 18px;
  }
  p,
  li,
  dd {
    font-size: 17px;
  }
}