/*
 * Session 31 Step 5 — Loading state library
 *
 * Refined loading states across the platform:
 *   - Top-of-page progress bar (gold thin, 3px)
 *   - Inline content loading (Cormorant ellipsis, three subtle gold dots)
 *   - Image loading (cream-tinted placeholder with gradient)
 *   - Skeleton screens (article list, hotel grid, dashboard)
 *   - Long-operation framing (editorial copy, not "Loading…")
 *
 * Avoids generic "Loading…" language. Editorial sensibility throughout.
 */

/* -------------------------------------------------------------------------- */
/* Top-of-page progress bar                                                   */
/* -------------------------------------------------------------------------- */

.top-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: transparent;
  z-index: 100;
  pointer-events: none;
}

.top-progress__bar {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--gold-dim, #8A7038) 0%, var(--gold, #C4A052) 50%, var(--gold-pale, #E5D4A0) 100%);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 200ms cubic-bezier(0.0, 0, 0.2, 1), opacity 300ms cubic-bezier(0.0, 0, 0.2, 1);
}

.top-progress.is-indeterminate .top-progress__bar {
  animation: top-progress-indeterminate 1.4s ease-in-out infinite;
}

.top-progress.is-complete .top-progress__bar {
  transform: scaleX(1);
  opacity: 0;
}

@keyframes top-progress-indeterminate {
  0%   { transform: scaleX(0.0); transform-origin: left center; }
  50%  { transform: scaleX(0.6); transform-origin: left center; }
  51%  { transform: scaleX(0.6); transform-origin: right center; }
  100% { transform: scaleX(0.0); transform-origin: right center; }
}

/* -------------------------------------------------------------------------- */
/* Inline ellipsis — three gold dots with gentle pulse                        */
/* -------------------------------------------------------------------------- */

.loading-ellipsis {
  display: inline-flex;
  gap: 0.4em;
  align-items: center;
  vertical-align: baseline;
  font-family: var(--font-display, 'Cormorant Garamond', serif);
}

.loading-ellipsis > span {
  display: inline-block;
  width: 0.32em;
  height: 0.32em;
  border-radius: 50%;
  background: var(--gold, #C4A052);
  opacity: 0.4;
  animation: ellipsis-pulse 1.2s ease-in-out infinite;
}

.loading-ellipsis > span:nth-child(2) { animation-delay: 0.16s; }
.loading-ellipsis > span:nth-child(3) { animation-delay: 0.32s; }

@keyframes ellipsis-pulse {
  0%, 100% { opacity: 0.25; transform: scale(1); }
  50%      { opacity: 0.95; transform: scale(1.2); }
}

/* -------------------------------------------------------------------------- */
/* Image loading placeholder                                                  */
/* -------------------------------------------------------------------------- */

.image-loading {
  position: relative;
  overflow: hidden;
  background-color: var(--card2, #2A4368);
  background-image: linear-gradient(
    180deg,
    rgba(245, 240, 232, 0.04) 0%,
    rgba(245, 240, 232, 0.0) 100%
  );
}

.image-loading::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(245, 240, 232, 0.06) 50%,
    transparent 100%
  );
  animation: shimmer 1.6s ease-in-out infinite;
}

.surface-cream .image-loading {
  background-color: #F5EFE6;
  background-image: linear-gradient(
    180deg,
    rgba(26, 43, 74, 0.04) 0%,
    rgba(26, 43, 74, 0.0) 100%
  );
}

.surface-cream .image-loading::after {
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(26, 43, 74, 0.05) 50%,
    transparent 100%
  );
}

/* Smooth fade-in to actual image when loaded. Pages add .is-loaded once
   the underlying <img> reports complete. */
.image-loading > img {
  opacity: 0;
  transition: opacity 600ms cubic-bezier(0.0, 0, 0.2, 1);
}

.image-loading.is-loaded > img {
  opacity: 1;
}

.image-loading.is-loaded::after {
  display: none;
}

@keyframes shimmer {
  0%   { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* -------------------------------------------------------------------------- */
/* Skeleton screens                                                           */
/* -------------------------------------------------------------------------- */

.skeleton {
  position: relative;
  background-color: var(--card2, #2A4368);
  overflow: hidden;
  border-radius: 2px;
}

.skeleton::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(245, 240, 232, 0.06) 50%,
    transparent 100%
  );
  animation: shimmer 1.6s ease-in-out infinite;
}

.surface-cream .skeleton {
  background-color: #F5EFE6;
}

.surface-cream .skeleton::after {
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(26, 43, 74, 0.05) 50%,
    transparent 100%
  );
}

/* Article list skeleton — Cormorant-styled placeholder cards */
.skeleton-article-card {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.skeleton-article-card .skeleton-photo {
  aspect-ratio: 4 / 3;
}

.skeleton-article-card .skeleton-line {
  height: 1.25rem;
  border-radius: 2px;
}

.skeleton-article-card .skeleton-line.short {
  width: 40%;
  height: 0.75rem;
}

.skeleton-article-card .skeleton-line.long {
  width: 90%;
  height: 1.5rem;
}

/* Hotel grid skeleton */
.skeleton-hotel-card {
  display: grid;
  gap: 0.75rem;
}

.skeleton-hotel-card .skeleton-photo {
  aspect-ratio: 5 / 4;
}

.skeleton-hotel-card .skeleton-line {
  height: 1rem;
  border-radius: 2px;
}

.skeleton-hotel-card .skeleton-line.title {
  width: 70%;
  height: 1.25rem;
}

.skeleton-hotel-card .skeleton-line.meta {
  width: 45%;
  height: 0.75rem;
}

/* Dashboard skeleton — section-specific layouts */
.skeleton-dashboard-section {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  padding: 2rem 0;
}

.skeleton-dashboard-section .skeleton-line {
  height: 1.25rem;
  border-radius: 2px;
}

.skeleton-dashboard-section .skeleton-line.heading {
  width: 30%;
  height: 1.75rem;
}

.skeleton-dashboard-section .skeleton-line.body {
  width: 100%;
}

.skeleton-dashboard-section .skeleton-line.body.short {
  width: 60%;
}

/* -------------------------------------------------------------------------- */
/* Long-operation editorial framing                                           */
/* -------------------------------------------------------------------------- */
/*
 * Used during slow operations to replace generic "Loading…" with editorial
 * copy: "Curating your results…", "Preparing your booking…", etc.
 * Pages set the copy via [data-loading-message] or pass it in JS.
 */

.loading-editorial {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  padding: 4rem 1.5rem;
  text-align: center;
}

.loading-editorial__copy {
  font-family: var(--font-display, 'Cormorant Garamond', serif);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(1.125rem, 1.4vw, 1.375rem);
  line-height: 1.5;
  color: var(--text-mid, #B0AEAB);
  max-width: 36ch;
}

/* -------------------------------------------------------------------------- */
/* Reduced motion                                                             */
/* -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  .top-progress.is-indeterminate .top-progress__bar,
  .loading-ellipsis > span,
  .image-loading::after,
  .skeleton::after {
    animation: none !important;
  }

  .top-progress.is-indeterminate .top-progress__bar {
    transform: scaleX(0.4);
    opacity: 0.6;
  }

  .loading-ellipsis > span {
    opacity: 0.6;
  }
}