/* 统一分页导航 · 由 scripts/inject_nav.py 注入到每个页面的 <body> 之后
   只作用于 #site-nav，不改各站原有样式 */
#site-nav {
  position: sticky;
  top: 0;
  z-index: 9999;
  background: #fff;
  border-bottom: 1px solid #e4e4e7;
  font-size: 13px;
  line-height: 1;
  -webkit-font-smoothing: antialiased;
}
#site-nav .sn-inner {
  display: flex;
  align-items: stretch;
  gap: 2px;
  max-width: 1060px;
  margin: 0 auto;
  padding: 0 14px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
#site-nav .sn-inner::-webkit-scrollbar { display: none; }
#site-nav a {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  height: 42px;
  padding: 0 12px;
  color: #52525b;
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  transition: color .12s, border-color .12s;
}
#site-nav a:hover { color: #18181b; }
#site-nav a.on { color: #1d4ed8; border-bottom-color: #1d4ed8; font-weight: 650; }
#site-nav .sn-brand {
  font-weight: 650;
  color: #18181b;
  padding-left: 0;
  padding-right: 14px;
  margin-right: 8px;
  border-right: 1px solid #e4e4e7;
  border-bottom: 2px solid transparent;
  letter-spacing: .01em;
}
#site-nav .sn-brand:hover { color: #1d4ed8; }
#site-nav .sn-brand.on { color: #18181b; }
@media (max-width: 520px) {
  #site-nav .sn-inner { padding: 0 8px; }
  #site-nav a { padding: 0 9px; }
}