/* ── Main-site nav bar injected into Sphinx docs ── */
@import url('https://fonts.googleapis.com/css2?family=Jost:wght@200;300;400&display=swap');

#site-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 40px;
  height: 54px;
  border-bottom: 0.5px solid #e0e0e0;
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 9999;
  font-family: 'Jost', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
}

#site-nav a {
  text-decoration: none;
  transition: opacity 0.15s;
}

#site-nav a:hover {
  opacity: 0.55;
  text-decoration: none;
}

/* Brand */
#site-nav .site-nav-brand {
  font-size: 18px;
  letter-spacing: 0.03em;
  color: #111111;
  flex-shrink: 0;
  opacity: 1;
}

/* Center links */
#site-nav .site-nav-links {
  display: flex;
  gap: 36px;
}

#site-nav .site-nav-links a {
  font-size: 15px;
  color: #555555;
}

#site-nav .site-nav-links a:hover {
  color: #111111;
  opacity: 1;
}

/* Right: language switcher — matches main site nav-right exactly */
#site-nav .site-nav-right {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
}

#site-nav .lang-btn {
  background: none;
  border: none;
  color: #999999;
  font-family: inherit;
  font-size: 12px;
  cursor: pointer;
  padding: 4px 6px;
  letter-spacing: 0.04em;
  opacity: 1;
}

#site-nav .lang-btn:hover {
  color: #111111;
  opacity: 1;
}

#site-nav .lang-btn.active {
  color: #111111;
  text-decoration: underline;
  text-decoration-thickness: 0.5px;
  text-underline-offset: 3px;
}

#site-nav .lang-sep {
  color: #999999;
  font-size: 11px;
}