* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: #fff;
  color: #111;
  font-family: Georgia, "Times New Roman", "Songti SC", "SimSun", serif;
  font-size: 18px;
  line-height: 1.62;
}

a {
  color: #0645ad;
  text-decoration: underline;
  text-underline-offset: 2px;
}

a:visited {
  color: #0b0080;
}

a:focus-visible {
  outline: 2px solid #111;
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  padding: 6px 8px;
  background: #111;
  color: #fff;
  transform: translateY(-140%);
}

.skip-link:focus {
  transform: translateY(0);
}

.page {
  width: min(760px, calc(100% - 36px));
  margin: 0 auto;
  padding: 28px 0 56px;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  margin-bottom: 38px;
  font-family:
    -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    sans-serif;
  font-size: 15px;
}

.intro {
  margin-bottom: 42px;
}

h1 {
  margin: 0 0 4px;
  font-size: 46px;
  line-height: 1.1;
  font-weight: 700;
}

.subtitle {
  margin: 0 0 22px;
  color: #555;
  font-family:
    -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    sans-serif;
  font-size: 16px;
}

h2 {
  margin: 38px 0 12px;
  padding-top: 12px;
  border-top: 1px solid #ddd;
  font-size: 28px;
  line-height: 1.25;
}

p {
  margin: 0 0 16px;
}

.link-list {
  margin: 0;
  padding-left: 1.25em;
}

.link-list li {
  margin: 0 0 18px;
}

.link-list p {
  margin: 4px 0 0;
  color: #444;
  font-size: 16px;
}

footer {
  margin-top: 44px;
  padding-top: 18px;
  border-top: 1px solid #ddd;
}

@media (max-width: 520px) {
  body {
    font-size: 17px;
  }

  .page {
    width: min(100% - 28px, 760px);
    padding-top: 22px;
  }

  h1 {
    font-size: 38px;
  }

  h2 {
    font-size: 25px;
  }
}