:root {
  color-scheme: light;
  font-family: system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
  color: #202932;
  background: #f7f8fa;
}

body { margin: 0; }

.wrap {
  max-width: 46rem;
  margin-inline: auto;
  padding: 1rem 1.25rem;
}

header { background: #fff; border-bottom: 1px solid #e0e5eb; }
nav { display: flex; flex-wrap: wrap; gap: .5rem 1.25rem; }
a { color: #1756a9; text-underline-offset: .18em; overflow-wrap: anywhere; }
a:focus-visible { outline: 2px solid #1756a9; outline-offset: 4px; }
[aria-current="page"] { font-weight: 700; }
h1 { font-size: clamp(1.75rem, 5vw, 2.5rem); line-height: 1.2; }
h2 { font-size: 1.15rem; }
section {
  margin: 1.25rem 0;
  padding: .25rem 1.25rem 1rem;
  border: 1px solid #e0e5eb;
  border-radius: .6rem;
  background: #fff;
}

dl { margin: 0; }
dt { font-weight: 600; margin-top: .65rem; }
dd { margin: 0; }
footer { color: #4d5a68; font-size: .9rem; }