/* === css/intel-building/layout/back-to-top/back-to-top.css === v1.0.0 ===
   Intel Building (new theme) — fixed "Back to Top" button, shared across
   every page via layouts/site_header.blade.php. State (shown/hidden) is
   driven by data-plx-visible, toggled from js/intel-building/layout/
   back-to-top.js — no CSS class toggling, per JS/CSS-STANDARDS.
   Isolated from the legacy KIBMS theme — do not merge. */

.plx-back-to-top {
  position: fixed;
  right: var(--space-5);
  bottom: var(--space-5);
  z-index: 40;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-pop);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--transition-base), transform var(--transition-base),
    visibility var(--transition-base), background-color var(--transition-fast);
}

.plx-back-to-top[data-plx-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.plx-back-to-top:hover,
.plx-back-to-top:focus-visible {
  background: var(--color-primary-hover);
}

.plx-back-to-top svg {
  width: 20px;
  height: 20px;
}

/* sm — large phones (>=576px): a little more breathing room from the edge */
@media (min-width: 576px) {
  .plx-back-to-top {
    right: var(--space-6);
    bottom: var(--space-6);
  }
}

/* lg — small laptops (>=992px) */
@media (min-width: 992px) {
  .plx-back-to-top {
    width: 52px;
    height: 52px;
    right: var(--space-8);
    bottom: var(--space-8);
  }
}