/* ==========================================================================
   Gallery — fullscreen comic reader + thumbnail browse grid.
   Loaded only on gallery pages; dropped on exit by the router.
   ========================================================================== */

/* --- Reader: covers everything, including header, footer and mascot ------ */

.reader {
  position: fixed;
  inset: 0;
  z-index: 200; /* above the mascot (60) and everything else */
  background: #14120f;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  touch-action: pan-y pinch-zoom; /* horizontal swipes are ours */
  user-select: none;
}

.reader__fallback {
  color: #f5f1e8;
  max-width: 40ch;
  text-align: center;
  line-height: 1.6;
  padding: 20px;
}

.reader__fallback a {
  color: var(--lime);
}

.reader__img {
  max-width: 100vw;
  max-height: 100vh;
  width: auto;
  height: auto;
  object-fit: contain;
  transition: opacity 0.14s ease;
}

.reader__img.is-loading {
  opacity: 0.25;
}

/* back arrow, top left */
.reader__back {
  position: absolute;
  top: max(14px, env(safe-area-inset-top));
  left: max(14px, env(safe-area-inset-left));
  z-index: 3;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  font-size: 1.35rem;
  color: #fff;
  text-decoration: none;
  background: rgb(0 0 0 / 0.5);
  border: 2px solid rgb(255 255 255 / 0.55);
}

.reader__back:hover,
.reader__back:focus-visible {
  background: rgb(0 0 0 / 0.75);
  outline: none;
  border-color: #fff;
}

/* prev/next arrows — pointer devices only; phones swipe instead */
.reader__arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  border: 2px solid rgb(255 255 255 / 0.55);
  background: rgb(0 0 0 / 0.5);
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
}

.reader__arrow:hover,
.reader__arrow:focus-visible {
  background: rgb(0 0 0 / 0.75);
  outline: none;
  border-color: #fff;
}

.reader__arrow--prev { left: max(16px, env(safe-area-inset-left)); }
.reader__arrow--next { right: max(16px, env(safe-area-inset-right)); }

.reader__arrow[disabled] {
  opacity: 0.25;
  cursor: default;
}

@media (pointer: coarse) {
  .reader__arrow {
    display: none; /* swipe instead */
  }
}

/* page counter, bottom centre */
.reader__counter {
  position: absolute;
  bottom: max(14px, env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  padding: 5px 14px;
  border-radius: 999px;
  background: rgb(0 0 0 / 0.55);
  color: #fff;
  font-family: var(--font-display);
  font-size: 0.9rem;
  letter-spacing: 0.05em;
}

/* spinner shown while the current page decodes */
.reader__spinner,
.browse-spinner {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 3px solid rgb(255 255 255 / 0.25);
  border-top-color: #fff;
  animation: reader-spin 0.8s linear infinite;
}

.reader__spinner {
  position: absolute;
  z-index: 1;
}

.reader__spinner[hidden] {
  display: none;
}

@keyframes reader-spin {
  to { transform: rotate(360deg); }
}

/* --- Browse: responsive thumbnail grid, batch-revealed -------------------- */

.browse-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 14px;
  margin-top: 8px;
}

.browse-item {
  display: block;
  text-decoration: none;
  border: 3px solid var(--mustard);
  border-radius: 10px;
  overflow: hidden;
  background: #fff;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.browse-item:hover {
  transform: translateY(-3px);
  box-shadow: 4px 6px 0 rgb(183 163 18 / 0.35);
}

.browse-item:focus-visible {
  outline: 3px solid var(--azure);
  outline-offset: 2px;
}

/* No fixed aspect-ratio here: each thumbnail carries its real width/height
   attributes, so the grid takes the comic's own page shape — landscape,
   portrait or square — and reserves the right space before it loads. */
.browse-item img {
  width: 100%;
  height: auto;
  display: block;
  background: var(--mustard-soft);
}

.browse-item__label {
  display: block;
  padding: 6px 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--green);
  background: var(--mustard-soft);
  border-top: 2px solid var(--mustard);
}

/* pending items stay in the DOM but out of view until their batch is revealed */
.browse-item.is-pending {
  display: none;
}

/* Loading strip under the grid. The element itself stays in the layout so
   the IntersectionObserver can watch it; the spinner + label only appear
   while a batch of thumbnails is actually fetching. */
.browse-sentinel {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 26px;
  padding: 26px 0;
  font-weight: 700;
  color: var(--green);
}

.browse-sentinel[hidden] {
  display: none;
}

.browse-sentinel:not(.is-loading) > * {
  visibility: hidden;
}

.browse-sentinel .browse-spinner {
  border-color: rgb(55 130 15 / 0.25);
  border-top-color: var(--green);
}

@media (prefers-reduced-motion: reduce) {
  .reader__img {
    transition: none;
  }
  .browse-item:hover {
    transform: none;
  }
}