:root {
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Noto Sans SC", "Hiragino Sans GB", sans-serif;
  color: #0f172a;
  background: #f8fafc;
  line-height: 1.7;
}

.seo-header,
.seo-footer,
.seo-main {
  max-width: 46rem;
  margin: 0 auto;
  padding: 1rem 1.25rem;
}

.seo-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid #e2e8f0;
  background: #fff;
  max-width: none;
  padding: 0.85rem 1.5rem;
}

.seo-header nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
}

.seo-logo {
  font-weight: 700;
  color: #1d4ed8;
  text-decoration: none;
}

a {
  color: #1d4ed8;
}

.seo-main {
  background: #fff;
  margin: 1.25rem auto 2rem;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
}

.seo-meta {
  color: #64748b;
  font-size: 0.9rem;
}

.seo-note {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: 8px;
  padding: 0.75rem 1rem;
  color: #1e3a8a;
}

.seo-cta a {
  display: inline-block;
  background: #2563eb;
  color: #fff;
  text-decoration: none;
  padding: 0.7rem 1.1rem;
  border-radius: 8px;
  font-weight: 600;
}

.seo-related ul {
  padding-left: 1.2rem;
}

.seo-footer {
  color: #64748b;
  font-size: 0.85rem;
  max-width: none;
  text-align: center;
  border-top: 1px solid #e2e8f0;
}

.seo-hub-list {
  display: grid;
  gap: 0.75rem;
  padding: 0;
  list-style: none;
}

.seo-hub-list a {
  display: block;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 0.85rem 1rem;
  text-decoration: none;
  color: inherit;
}

.seo-crumbs {
  font-size: 0.85rem;
  color: #64748b;
  margin: 0 0 1rem;
}

.seo-crumbs a {
  color: #1d4ed8;
}

.seo-question {
  margin: 1.5rem 0;
  padding: 1rem 1.1rem;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  background: #fff;
}

.seo-q-meta {
  color: #64748b;
  font-size: 0.9rem;
  margin-top: 0.2rem;
}

.seo-q-cta {
  display: inline-block;
  margin-top: 0.35rem;
  padding: 0.45rem 0.85rem;
  border-radius: 8px;
  background: #1d4ed8;
  color: #fff !important;
  text-decoration: none;
  font-weight: 600;
}

.seo-inline-links {
  padding-left: 1.2rem;
}