/* ============================
   Loading States & Overlays
   ============================ */

/* === Global Loading Overlay === */
.loading-overlay {
  position: fixed;
  inset: 0;
  background-color: rgb(var(--backdrop-rgb) / 35%);
  backdrop-filter: blur(6px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: var(--z-loading-overlay, 9999);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 180ms cubic-bezier(0, 0, 0.2, 1),
    visibility 180ms cubic-bezier(0, 0, 0.2, 1);
  pointer-events: auto;
}

/* === Swup Progress Bar === */
.swup-progress-bar {
  position: fixed;
  top: env(safe-area-inset-top, 0);
  left: 0;
  right: 0;
  height: 2px;
  background: var(--action);
  pointer-events: none;
  z-index: var(--z-loading-overlay, 9999);
}

.loading-overlay.non-blocking {
  background-color: transparent;
  backdrop-filter: none;
  pointer-events: none;
  justify-content: center;
  align-items: flex-end;
  padding: 16px;
  padding-bottom: 32px;
}

/* Map route: a compact cartographer's field note anchored to the map plate. */
body[data-route="/map"] .loading-overlay.non-blocking {
  display: block;
  padding: 0;
}

.loading-overlay.compact .loading-indicator {
  padding: 12px 14px;
  gap: 10px;
  box-shadow: 0 4px 20px rgb(0 0 0 / 25%);
}

.loading-overlay.visible {
  opacity: 1;
  visibility: visible;
}

/* Light mode adjustments */
html.light-mode body .loading-overlay,
[data-bs-theme="light"] .loading-overlay {
  background-color: rgb(var(--surface-rgb) / 60%);
}

/* === Loading Indicator === */
.loading-indicator {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 22px;
  background: var(--glass-2);
  border-radius: 50px;
  box-shadow: var(--shadow-glass-lg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(var(--blur-strong));
  animation: fadeInScale 180ms cubic-bezier(0, 0, 0.2, 1) both;
}

body[data-route="/map"] .loading-overlay.non-blocking .loading-indicator {
  position: absolute;
  left: calc(clamp(300px, 24vw, 360px) + var(--space-3));
  bottom: calc(var(--space-3) + 30px);
  max-width: min(32rem, calc(100vw - clamp(300px, 24vw, 360px) - 6rem));
  min-height: 38px;
  gap: var(--space-2);
  padding: 7px 11px 7px 9px;
  overflow: hidden;
  contain: layout paint;
  background: rgb(var(--surface-rgb) / 94%);
  border: 1px solid rgb(var(--text-rgb) / 14%);
  border-left: 2px solid var(--action);
  border-radius: var(--radius-xs);
  box-shadow: 0 6px 18px rgb(0 0 0 / 22%);
  backdrop-filter: none;
  animation: map-status-enter 180ms cubic-bezier(0, 0, 0.2, 1) both;
}

body[data-route="/map"]:has(.atlas-rail.is-collapsed)
  .loading-overlay.non-blocking
  .loading-indicator {
  left: var(--space-3);
  max-width: min(32rem, calc(100vw - 6rem));
}

body[data-route="/map"]
  .loading-overlay.non-blocking
  .loading-indicator
  .route-tracer__svg {
  width: 38px;
}

body[data-route="/map"]
  .loading-overlay.non-blocking
  .loading-indicator
  :is(.route-tracer__line, .route-tracer__dot) {
  filter: none;
}

body[data-route="/map"] .loading-overlay.non-blocking .loading-text {
  overflow: hidden;

  /* The counter ticks in place, so the digits must not reflow. */
  font-variant-numeric: tabular-nums;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--tracking-normal);
  line-height: 1.25;
  text-overflow: ellipsis;
}

@keyframes map-status-enter {
  from {
    opacity: 0;
    transform: translateY(5px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

html.light-mode body .loading-indicator,
[data-bs-theme="light"] .loading-indicator {
  background: var(--glass-2);
  box-shadow: var(--shadow-glass-lg);
  border-color: var(--glass-border);
}

/* === Spinner === */
.loading-spinner {
  width: 24px;
  height: 24px;
  border: 3px solid rgb(var(--text-rgb) / 20%);
  border-top-color: var(--action);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

html.light-mode body .loading-spinner,
[data-bs-theme="light"] .loading-spinner {
  border-color: rgb(var(--border-rgb) / 20%);
  border-top-color: var(--action);
}

/* === Loading Text === */
.loading-text {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
}

html.light-mode body .loading-text,
[data-bs-theme="light"] .loading-text {
  color: var(--text-primary);
}

/* Spin animation defined in animations.css as 'spin' */

/* === Button Loading State === */
.btn.btn-loading {
  position: relative;
  color: transparent;
  pointer-events: none;
}

.btn.btn-loading::after {
  content: "";
  position: absolute;
  width: 1em;
  height: 1em;
  top: 50%;
  left: 50%;
  margin: -0.5em 0 0 -0.5em;
  border: 2px solid var(--btn-loading-color, var(--text-primary));
  border-radius: 50%;
  border-top-color: transparent;
  animation: spin 0.6s linear infinite;
  opacity: 0.8;
}

/* Filled buttons need white spinner */
.btn-primary.btn-loading::after {
  border-color: rgb(var(--text-rgb) / 30%);
  border-top-color: var(--text-primary);
}

@keyframes skeleton-shimmer {
  0% {
    background-position: 200% 0;
  }

  100% {
    background-position: -200% 0;
  }
}

/* === Reduced Motion Support === */
@media (prefers-reduced-motion: reduce) {
  .loading-spinner,
  .btn.btn-loading::after,
  .swup-progress-bar {
    animation: none;
  }

  .loading-spinner {
    border-color: var(--action);
    opacity: 0.7;
  }

  body[data-route="/map"] .loading-overlay.non-blocking .loading-indicator {
    animation: none;
  }
}

@media (width <= 768px) {
  body[data-route="/map"] .loading-overlay.non-blocking .loading-indicator,
  body[data-route="/map"]:has(.atlas-rail.is-collapsed)
    .loading-overlay.non-blocking
    .loading-indicator {
    left: var(--space-2);
    bottom: calc(
      var(--map-sheet-visible-height, 96px) +
      env(safe-area-inset-bottom, 0px) +
      var(--space-3)
    );
    max-width: calc(100vw - 5.5rem);
    min-height: 40px;
  }
}

/* === Mobile Adjustments === */
@media (width <= 576px) {
  .loading-indicator {
    padding: 12px 20px;
    gap: 10px;
  }

  .loading-spinner {
    width: 20px;
    height: 20px;
    border-width: 2px;
  }

  .loading-text {
    font-size: var(--font-size-sm);
  }
}