/* AI FDE only: retain the shared header layout and interaction rules. */
.site-header #navigation-ai-fde .mega-groups {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  padding: 28px 18px;
}

.site-header #navigation-ai-fde .mega-group {
  padding-inline: 18px;
}

.site-header #navigation-ai-fde .mega-intro p {
  max-width: 800px;
}

.site-header #navigation-ai-fde .mega-footer {
  align-items: center;
  gap: 30px;
}

.site-header #navigation-ai-fde .fde-mega-history,
.site-header #navigation-ai-fde .fde-mega-principles {
  margin: 0;
  font-size: 11px;
  line-height: 1.8;
  color: #53684c;
}

.site-header #navigation-ai-fde .fde-mega-history strong {
  color: #00583c;
  font-weight: 650;
}

.site-header #navigation-ai-fde .fde-mega-principles {
  text-align: right;
}

@media (max-width: 1100px) {
  .site-header #navigation-ai-fde .mega-group {
    padding-inline: 10px;
  }
}

@media (max-width: 1023px) {
  .site-header #navigation-ai-fde .mega-groups {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 16px;
    padding: 14px 0 24px;
  }

  .site-header #navigation-ai-fde .mega-group {
    padding: 0;
    border: 0;
  }

  .site-header #navigation-ai-fde .mega-group:last-child {
    grid-column: 1 / -1;
  }

  .site-header #navigation-ai-fde .mega-group:last-child ul {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 4px 16px;
  }

  .site-header #navigation-ai-fde .mega-group:last-child li {
    margin-top: 0;
  }

  .site-header #navigation-ai-fde .mega-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 7px;
  }

  .site-header #navigation-ai-fde .fde-mega-principles {
    text-align: left;
  }
}

@media (max-width: 600px) {
  .site-header #navigation-ai-fde .mega-groups,
  .site-header #navigation-ai-fde .mega-group:last-child ul {
    grid-template-columns: minmax(0, 1fr);
  }

  .site-header #navigation-ai-fde .mega-groups {
    gap: 20px;
  }

  .site-header #navigation-ai-fde .fde-mega-history,
  .site-header #navigation-ai-fde .fde-mega-principles {
    font-size: 12px;
  }
}