body {
  margin: 0;
  background: #121212;
  color: #dddddd;
  font: 16px/1.55 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

main {
  max-width: 40rem;
  margin: 4rem auto;
  padding: 0 1rem;
}

section {
  margin-top: 3rem;
}

h1 {
  font-size: 1.6rem;
}

h1 a {
  text-decoration: none;
}

h2 {
  margin-top: 2rem;
  font-size: 1.1rem;
}

.title-row {
  display: flex;
  justify-content: space-between;
}

h3 {
  margin-top: 2.25rem;
  font-size: 1rem;
}

h4 {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
}

p {
  color: #c8c8c8;
}

a {
  color: #eeeeee;
}

a[aria-current="page"] {
  color: #ffffff;
  text-decoration-thickness: 2px;
}

nav {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
}

nav a {
  color: #9f9f9f;
}

.nav-back {
  margin-right: 0.25rem;
}

.index-list {
  display: grid;
  gap: 1.25rem;
}

.index-list article {
  border-left: 1px solid #333333;
  padding-left: 1rem;
}

.index-list h3 {
  margin: 0;
}

.note-date {
  color: #9f9f9f;
  display: block;
  font-size: 0.8rem;
  margin-top: 0.2rem;
}

.index-list p {
  margin: 0.2rem 0 0;
}

nav a[aria-current="page"] {
  color: #ffffff;
}

.small-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.small-grid > div,
.large-grid > div {
  border: 1px solid #333333;
  padding: 0.85rem;
}

.small-grid strong,
.small-grid span,
.large-grid h4 {
  display: block;
}

.small-grid strong,
.large-grid h4 {
  color: #9f9f9f;
  font-weight: 500;
  margin-bottom: 0;
}

.small-grid strong {
  font-size: 0.8rem;
}

.small-grid span,
.large-grid p {
  margin-top: 0.25rem;
}

.large-grid {
  display: grid;
  gap: 1rem;
}

.large-grid p {
  margin-bottom: 0;
}

@media (max-width: 38rem) {
  .small-grid {
    grid-template-columns: 1fr;
  }
}

.demo-frame {
  display: block;
  width: min(100%, 24rem);
  aspect-ratio: 1 / 1;
  border: 1px solid #333333;
  background: #000000;
  margin-bottom: 3rem;
}