/* FIX v1.8 — Header sticky + back-to-top más arriba */

.site-header {
  position: sticky !important;
  top: 0 !important;
  background: #fff !important;
  z-index: 999 !important;
  transition: box-shadow 0.2s ease, padding 0.2s ease;
}
.site-header.is-scrolled { box-shadow: 0 4px 16px rgba(0,0,0,0.08); }

.page-nav {
  position: sticky !important;
  top: 82px !important;
  z-index: 50 !important;
}
@media (max-width: 900px) { .page-nav { top: 72px !important; } }

.back-to-top {
  bottom: 96px !important;
  right: 24px !important;
}
@media (max-width: 720px) {
  .back-to-top { bottom: 88px !important; right: 16px !important; }
}