/* ══════════════════════════════════════════════
   Loading Spinner – Absolute Centered
   ══════════════════════════════════════════════ */

.loading {
  position: fixed;
  z-index: 99999;
  height: 2em;
  width: 2em;
  overflow: visible;
  margin: auto;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
}

/* Transparent Overlay */
.loading::before {
  content: '';
  display: block;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.3);
}

.loading:not(:required) {
  font: 0/0 a;
  color: transparent;
  text-shadow: none;
  background-color: transparent;
  border: 0;
}

.loading:not(:required)::after {
  content: '';
  display: block;
  font-size: 10px;
  width: 1em;
  height: 1em;
  margin-top: -0.5em;
  animation: spinner 1500ms infinite linear;
  border-radius: 0.5em;
  box-shadow:
    var(--spinner-highlight, #fff) 1.5em 0 0 0,
    var(--spinner-dark, rgba(0, 0, 0, 0.75)) 1.1em 1.1em 0 0,
    var(--spinner-dark, rgba(0, 0, 0, 0.75)) 0 1.5em 0 0,
    var(--spinner-highlight, #fff) -1.1em 1.1em 0 0,
    var(--spinner-mid, rgba(0, 0, 0, 0.5)) -1.5em 0 0 0,
    var(--spinner-mid, rgba(0, 0, 0, 0.5)) -1.1em -1.1em 0 0,
    var(--spinner-dark, rgba(0, 0, 0, 0.75)) 0 -1.5em 0 0,
    var(--spinner-dark, rgba(0, 0, 0, 0.75)) 1.1em -1.1em 0 0;
}

@keyframes spinner {
  0%   { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}