/* 站点导航 — 纯本地样式，无外部依赖 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1030;
  background: linear-gradient(135deg, #0a1628 0%, #0f2847 55%, #0d2137 100%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
}

.site-nav {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 68px;
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
}

.site-nav-glow {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, #ff6a00 30%, #ffc107 50%, #ff6a00 70%, transparent);
  opacity: 0.85;
  pointer-events: none;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: #fff;
  flex-shrink: 0;
}

.site-brand-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: linear-gradient(135deg, #ff6a00, #e65c00);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  box-shadow: 0 4px 12px rgba(255, 106, 0, 0.35);
}

.site-brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.site-brand-text strong {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
}

.site-brand-sub {
  font-size: 0.72rem;
  color: rgba(255, 255, 255, 0.65);
  letter-spacing: 0.12em;
}

.site-nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
  cursor: pointer;
}

.site-nav-toggle-icon,
.site-nav-toggle-icon::before,
.site-nav-toggle-icon::after {
  display: block;
  width: 20px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}

.site-nav-toggle-icon {
  position: relative;
}

.site-nav-toggle-icon::before,
.site-nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
}

.site-nav-toggle-icon::before {
  top: -6px;
}

.site-nav-toggle-icon::after {
  top: 6px;
}

.site-nav-toggle.is-active .site-nav-toggle-icon {
  background: transparent;
}

.site-nav-toggle.is-active .site-nav-toggle-icon::before {
  top: 0;
  transform: rotate(45deg);
}

.site-nav-toggle.is-active .site-nav-toggle-icon::after {
  top: 0;
  transform: rotate(-45deg);
}

.site-nav-right {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.site-nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav-link {
  display: inline-block;
  padding: 0.45rem 0.85rem;
  color: rgba(255, 255, 255, 0.82);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  border-radius: 6px;
  transition: color 0.2s, background 0.2s;
}

.site-nav-link:hover,
.site-nav-link.active {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.site-nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 1.15rem;
  border-radius: 999px;
  background: linear-gradient(135deg, #ff6a00, #e65c00);
  color: #fff !important;
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  box-shadow: 0 4px 14px rgba(255, 106, 0, 0.35);
  transition: transform 0.2s, box-shadow 0.2s;
}

.site-nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(255, 106, 0, 0.45);
  color: #fff;
}

@media (max-width: 991.98px) {
  .site-nav-toggle {
    display: inline-flex;
  }

  .site-nav-right {
    position: absolute;
    top: calc(100% + 2px);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
    padding: 1rem;
    background: #0a1628;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
    display: none;
  }

  .site-nav-right.is-open {
    display: flex;
  }

  .site-nav-links {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }

  .site-nav-link {
    padding: 0.65rem 0.85rem;
  }

  .site-nav-cta {
    justify-content: center;
    width: 100%;
  }
}