* {
  box-sizing: border-box;
}

html {
  background: #f7f7f3;
  color: #111;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  line-height: 1.72;
}

body {
  margin: 0;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.seo-shell {
  margin: 0 auto;
  max-width: 800px;
  padding: 28px 18px 56px;
}

.seo-nav,
.seo-card,
.seo-footer,
.seo-type-link,
.seo-note {
  border: 2px solid #111;
  background: #fff;
}

.seo-nav {
  align-items: center;
  display: flex;
  gap: 14px;
  justify-content: space-between;
  margin-bottom: 16px;
  padding: 12px 14px;
}

.seo-brand {
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 0;
  text-decoration: none;
}

.seo-nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
  font-size: 14px;
}

.seo-card {
  padding: 22px 18px;
}

.seo-kicker {
  color: #555;
  font-size: 14px;
  margin: 0 0 8px;
}

h1 {
  font-size: 30px;
  line-height: 1.22;
  margin: 0 0 14px;
}

h2 {
  border-top: 1px solid #111;
  font-size: 22px;
  line-height: 1.35;
  margin: 28px 0 10px;
  padding-top: 18px;
}

p,
li {
  font-size: 17px;
  margin: 0 0 12px;
}

ul {
  margin: 0 0 14px;
  padding-left: 22px;
}

.seo-cta {
  display: block;
  margin: 26px 0 4px;
  padding: 14px 16px;
  border: 2px solid #111;
  background: #111;
  color: #fff;
  font-size: 18px;
  font-weight: 800;
  text-align: center;
  text-decoration: none;
}

.seo-related {
  display: grid;
  gap: 8px;
  margin-top: 18px;
}

.seo-related a {
  display: inline-block;
}

.seo-type-grid,
.seo-type-links {
  display: grid;
  gap: 10px;
}

.seo-type-row h2 {
  margin-top: 24px;
}

.seo-type-links {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.seo-type-link {
  display: grid;
  gap: 4px;
  min-height: 128px;
  padding: 12px;
  text-decoration: none;
}

.seo-type-link strong {
  font-size: 19px;
  line-height: 1.25;
}

.seo-type-link span {
  color: #333;
  font-size: 14px;
}

.seo-type-link small {
  color: #555;
  font-size: 13px;
  line-height: 1.45;
}

.seo-note {
  margin: 18px 0;
  padding: 12px 14px;
}

.seo-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 16px;
  padding: 12px 14px;
  color: #555;
  font-size: 13px;
}

@media (max-width: 720px) {
  .seo-type-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .seo-shell {
    padding: 16px 10px 40px;
  }

  .seo-nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .seo-nav-links {
    justify-content: flex-start;
  }

  h1 {
    font-size: 26px;
  }

  .seo-type-links {
    grid-template-columns: 1fr;
  }
}