/* ---- Zoom lightbox ---- */
/* A tapped/clicked .page opens here: the sheet on a dark, blurred backdrop,
   pan- and pinch-zoomable. Hidden until #lightbox gets [data-open]. */
#lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: none;
  /* Solid dark layer paints unconditionally — the fallback (and the whole
     look) where backdrop-filter is unsupported or GPU compositing drops it.
     The blur lives on ::before so it can degrade without taking this with it. */
  background: rgba(20, 8, 20, 0.82);
  touch-action: none; /* we handle pinch/pan ourselves */
}
#lightbox[data-open] {
  display: block;
}
#lightbox::before {
  content: "";
  position: absolute;
  inset: 0;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

@media (prefers-reduced-motion: no-preference) {
  #lightbox[data-open] {
    animation: lightbox-fade 0.15s ease-out;
  }
}
@keyframes lightbox-fade {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* The pan/zoom viewport fills the overlay; the stage inside is transformed. */
.lightbox-stage {
  position: absolute;
  inset: 0;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  /* Left-click-drag pans, so a drag must not start a text selection instead. */
  user-select: none;
}
.lightbox-stage svg,
.lightbox-stage img {
  cursor: grab;
}
.lightbox-stage[data-grabbing] svg,
.lightbox-stage[data-grabbing] img {
  cursor: grabbing;
}
.lightbox-stage svg,
.lightbox-stage img {
  display: block;
  /* The stage centers with flex, so the sheet is a flex item: without flex:none
     its default flex-shrink squeezes the width back to the stage once zoom takes
     it past the viewport, and the sheet stops growing while the (taller) box
     around it keeps expanding — zoom appears to stall and pad with white. */
  flex: none;
  max-width: 92vw;
  max-height: 92vh;
  width: auto;
  height: auto;
  /* JS drives translate/scale from here. */
  transform: translate(0, 0) scale(1);
  transform-origin: center center;
  will-change: transform;
  background: var(--color-white);
  border-radius: 0.25rem;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

/* Floating controls: close (top-right) + zoom cluster (bottom-center). */
.lightbox-controls {
  position: absolute;
  bottom: max(1rem, env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 0.5rem;
  z-index: 2;
}
.lightbox-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  font-size: 1.35rem;
  line-height: 1;
  color: #fff;
  background: rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 0.5rem;
  cursor: pointer;
}
.lightbox-btn:hover {
  background: rgba(0, 0, 0, 0.7);
}
.lightbox-btn:focus-visible {
  outline: 3px solid var(--radio-focus-ring);
  outline-offset: 2px;
}
/* Round page turners, vertically centered. The left/right insets here are only a
   fallback: lightbox.js sets them from the fitted sheet width, so the buttons sit
   just outside its edges instead of out at the viewport rim. */
.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  border-radius: 50%;
}
.lightbox-nav svg {
  display: block;
}
.lightbox-nav-prev {
  left: max(1rem, env(safe-area-inset-left));
}
.lightbox-nav-next {
  right: max(1rem, env(safe-area-inset-right));
}
.lightbox-nav:disabled {
  opacity: 0.35;
  cursor: default;
}
@media (prefers-reduced-motion: no-preference) {
  /* Zooming moves the buttons between the sheet edge and the window edge
     (lightbox.js sets left/right): slide, don't jump. */
  .lightbox-nav {
    transition:
      left 0.18s ease-out,
      right 0.18s ease-out;
  }
}
.lightbox-nav[hidden] {
  display: none;
}
/* Touch turns pages by swiping, so the buttons would only cover the sheet. */
@media (hover: none), (pointer: coarse) {
  .lightbox-nav {
    display: none;
  }
}

.lightbox-close {
  position: absolute;
  top: max(1rem, env(safe-area-inset-top));
  right: max(1rem, env(safe-area-inset-right));
  z-index: 2;
}

/* Faint one-liner naming the wheel/drag controls; sits clear of the close
   button. The sheet reaches 92vh, so the hint overlaps its white top edge —
   hence the dark pill (same idea as the control buttons, which overlap the
   bottom). Hidden where there is no wheel (touch) — pinch and drag need no
   telling — and pointer-transparent so it can't swallow a click on the sheet. */
.lightbox-hint {
  position: absolute;
  top: max(1rem, env(safe-area-inset-top));
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  /* One line only: wrapping would leave the separator rules dangling at the
     start of a wrapped line. Too narrow to fit -> the hint is dropped below. */
  flex-wrap: nowrap;
  white-space: nowrap;
  margin: 0;
  padding: 0.35rem 0.7rem;
  font-size: 0.8rem;
  line-height: 1.3;
  text-align: center;
  color: rgba(255, 255, 255, 0.72);
  background: rgba(0, 0, 0, 0.45);
  border-radius: 0.4rem;
  pointer-events: none; /* only the dismiss button takes clicks */
}
.lightbox-hint[hidden] {
  display: none;
}
/* Hairline rule between tips (and before the dismiss button). */
.lightbox-hint > * + * {
  margin-left: 0.6rem;
  padding-left: 0.6rem;
  border-left: 1px solid rgba(255, 255, 255, 0.3);
}
.lightbox-hint-close {
  padding: 0 0 0 0.6rem;
  font-size: 0.85rem;
  line-height: 1;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
  pointer-events: auto;
}
.lightbox-hint-close:hover {
  color: #fff;
}
.lightbox-hint-close:focus-visible {
  outline: 2px solid var(--radio-focus-ring);
  outline-offset: 2px;
}
/* No wheel to speak of (touch), or no room for the single line: drop the hint. */
@media (hover: none), (pointer: coarse), (max-width: 34rem) {
  .lightbox-hint {
    display: none;
  }
}