html,
body {
  height: 100%;
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Helvetica,
    Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #0b1220;
  color: #e6edf3;
}
.wrap {
  min-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}
.card {
  max-width: 720px;
  width: 100%;
  background: #0f172a;
  border: 1px solid #1f2937;
  border-radius: 12px;
  padding: 28px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}
h1 {
  margin: 0 0 6px;
  font-size: 28px;
}
p {
  margin: 8px 0 14px;
  color: #cbd5e1;
}
code {
  background: #111827;
  color: #93c5fd;
  padding: 0.2em 0.45em;
  border-radius: 6px;
}
a {
  color: #93c5fd;
  text-decoration: none;
}
.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}
@media (min-width: 720px) {
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
.tile {
  background: #0b1220;
  border: 1px dashed #374151;
  border-radius: 10px;
  padding: 14px;
}
.muted {
  color: #94a3b8;
  font-size: 13px;
}
.pre-wrap {
  white-space: pre-wrap;
  margin: 8px 0 0;
}