body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: calc(var(--spacing) * 6);
  min-height: 100dvh;
  padding: calc(var(--spacing) * 6);
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: var(--text-lg);
  line-height: var(--text-lg--lh);
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(100%, 22rem);
}

header > div {
  display: flex;
  align-items: center;
  gap: calc(var(--spacing) * 2);
}

header > a {
  padding: calc(var(--spacing) * 2) calc(var(--spacing) * 3);
  font: inherit;
  font-weight: var(--fw-medium);
  color: var(--color-ink);
  text-decoration: none;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

header > a:hover {
  background: var(--color-surface);
}

input,
form > button {
  padding: calc(var(--spacing) * 2) calc(var(--spacing) * 3);
  font: inherit;
  border-radius: var(--radius);
}

input {
  color: var(--color-ink);
  background: var(--color-paper);
  border: 1px solid var(--color-border);
  transition: border-color 150ms ease;
}

input:hover {
  border-color: var(--color-ink-muted);
}

input:focus-visible,
form > button:focus-visible,
header > a:focus-visible {
  border-color: var(--color-focus);
  outline: 2px solid var(--color-focus);
  outline-offset: 1px;
}

main {
  width: min(100%, 24rem);
  padding: calc(var(--spacing) * 10);
  background: var(--color-surface);
  border-radius: calc(var(--radius) * 2);
  box-shadow:
    0 1px 2px color-mix(in oklab, var(--color-ink) 10%, transparent),
    0 1rem 2rem color-mix(in oklab, var(--color-ink) 6%, transparent);
}

form {
  display: grid;
  gap: calc(var(--spacing) * 2);
}

label {
  font-weight: var(--fw-medium);
}

form > button {
  margin-top: calc(var(--spacing) * 4);
  font-weight: var(--fw-bold);
  color: var(--color-on-primary);
  cursor: pointer;
  background: var(--color-primary);
  transition:
    background-color 150ms ease,
    transform 150ms ease;
}

form > button:hover {
  background: var(--color-primary-hover);
}

form > button:active {
  transform: translateY(1px);
}

@media (prefers-reduced-motion: no-preference) {
  header,
  main {
    animation: rise 300ms ease-out both;
  }

  main {
    animation-delay: 80ms;
  }
}

@keyframes rise {
  from {
    opacity: 0;
    translate: 0 0.5rem;
  }
}