:root {
  color-scheme: light dark;
  font: 16px/1.6 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f3f5f8;
  color: #17202a;
}

body {
  display: grid;
  min-height: 100vh;
  margin: 0;
  place-items: center;
}

.card {
  width: min(36rem, calc(100% - 3rem));
  padding: 3rem;
  border: 1px solid #d8dee6;
  border-radius: 1.25rem;
  background: #fff;
  box-shadow: 0 1rem 3rem rgb(23 32 42 / 10%);
}

.eyebrow {
  margin: 0 0 .5rem;
  color: #667085;
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .14em;
}

h1 { margin: 0 0 1rem; line-height: 1.1; }
a { color: #175cd3; }
nav { display: flex; gap: 1.25rem; margin-top: 1.5rem; }

@media (prefers-color-scheme: dark) {
  :root { background: #101828; color: #f2f4f7; }
  .card { border-color: #344054; background: #1d2939; box-shadow: none; }
  .eyebrow { color: #98a2b3; }
  a { color: #84adff; }
}