/* lightbox: the image viewer. Colours, timing and the curve are custom properties; the viewer is dark on purpose,
   so pictures read at their own colours whatever the page around them looks like. */

.lb {
  --lb-backdrop: rgb(9 9 11 / 0.97);
  --lb-text: #ffffff;
  --lb-muted: rgb(255 255 255 / 0.72);
  --lb-button: rgb(255 255 255 / 0.1);
  --lb-button-hover: rgb(255 255 255 / 0.18);
  --lb-z: 1000;
  /* The open and close: quick to start, long to settle, the way a sheet lands. */
  --lb-ease: cubic-bezier(0.32, 0.72, 0, 1);
  --lb-duration: 440ms;
  position: fixed;
  inset: 0;
  z-index: var(--lb-z);
  color: var(--lb-text);
  overscroll-behavior: contain;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}
.lb[hidden] { display: none; }
.lb:focus { outline: none; }

.lb-backdrop {
  position: absolute;
  inset: 0;
  background: var(--lb-backdrop);
  opacity: 0;
  transition: opacity var(--lb-duration) var(--lb-ease);
}
.lb:is([data-phase="opening-active"], [data-phase="open"]) .lb-backdrop { opacity: 1; }
.lb[data-dragging] .lb-backdrop { transition: none; }
.lb[data-phase="closing-active"] .lb-backdrop { transition-duration: calc(var(--lb-duration) * 0.8); }

.lb-track { position: absolute; inset: 0; }
.lb-track.lb-animate { transition: transform 400ms var(--lb-ease); }
.lb-slide { position: absolute; inset: 0; }
.lb-slide[hidden] { display: none; }

/* The frame sits at the image's fitted rectangle. Opening and closing move it between there and the thumbnail;
   a drag down moves it with the finger. */
.lb-frame { position: absolute; transform-origin: 0 0; will-change: transform; }
.lb-frame.lb-animate {
  transition:
    transform var(--lb-duration) var(--lb-ease),
    clip-path var(--lb-duration) var(--lb-ease),
    opacity 220ms ease;
}
.lb-layer { width: 100%; height: 100%; transform-origin: 0 0; }
.lb-layer.lb-animate { transition: transform 380ms var(--lb-ease); }
.lb-img {
  display: block;
  width: 100%;
  height: 100%;
  -webkit-user-drag: none;
  pointer-events: none;
}
.lb.lb-fine .lb-frame { cursor: zoom-in; }
.lb.lb-fine[data-zoomed] .lb-frame { cursor: grab; }
.lb.lb-fine[data-zoomed] .lb-frame:active { cursor: grabbing; }

/* Without a thumbnail on screen, or with reduced motion, the picture fades and settles instead of flying. */
.lb.lb-fade .lb-frame { transform-origin: 50% 50%; }
.lb.lb-fade[data-phase="opening"] .lb-track > :nth-child(2) .lb-frame,
.lb.lb-fade[data-phase="closing-active"] .lb-track > :nth-child(2) .lb-frame { opacity: 0; transform: scale(0.96); }

/* Controls: round keys on the dark, shown once the picture has landed and hidden while it is dragged. */
.lb-bar,
.lb-prev,
.lb-next,
.lb-caption { opacity: 0; transition: opacity 200ms ease; }
.lb[data-phase="open"] :is(.lb-bar, .lb-prev, .lb-next, .lb-caption) { opacity: 1; }
.lb:is([data-quiet], [data-dragging]) :is(.lb-bar, .lb-prev, .lb-next, .lb-caption) { opacity: 0; pointer-events: none; }

.lb-bar {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: max(12px, env(safe-area-inset-top)) max(12px, env(safe-area-inset-right)) 12px max(18px, env(safe-area-inset-left));
}
.lb-counter {
  margin-right: auto;
  color: var(--lb-muted);
  font-size: 13px;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.lb-btn {
  position: relative;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: var(--lb-button);
  color: var(--lb-text);
  cursor: pointer;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: background-color 160ms ease, transform 160ms var(--lb-ease), opacity 200ms ease;
}
.lb-btn:hover { background: var(--lb-button-hover); }
.lb-btn:active { transform: scale(0.94); }
.lb-btn:focus-visible { outline: 2px solid var(--lb-text); outline-offset: 2px; }
.lb-btn:disabled { opacity: 0.28; cursor: default; }
.lb-btn:disabled:active { transform: none; }
.lb-btn[hidden] { display: none; }
.lb-btn svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; overflow: visible; }
.lb-upright { transform-box: fill-box; transform-origin: center; transition: transform 200ms var(--lb-ease); }
.lb-zoom[data-zoomed] .lb-upright { transform: scaleY(0); }

.lb-prev,
.lb-next { position: absolute; top: 50%; translate: 0 -50%; }
.lb-prev { left: max(16px, env(safe-area-inset-left)); }
.lb-next { right: max(16px, env(safe-area-inset-right)); }
.lb-prev:active { transform: scale(0.94); }
/* On touch, a swipe does the job of the arrows. */
.lb:not(.lb-fine) :is(.lb-prev, .lb-next) { display: none; }

.lb-caption {
  position: absolute;
  bottom: max(16px, env(safe-area-inset-bottom));
  left: 50%;
  max-width: min(640px, calc(100% - 32px));
  margin: 0;
  padding: 8px 14px;
  border-radius: 12px;
  background: rgb(0 0 0 / 0.42);
  color: var(--lb-text);
  font-size: 14px;
  line-height: 1.45;
  text-align: center;
  text-wrap: balance;
  translate: -50% 0;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  pointer-events: auto;
}
.lb-caption[hidden] { display: none; }

.lb-sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* Reduced motion: no flights, no slides; things appear where they end up. */
@media (prefers-reduced-motion: reduce) {
  .lb { --lb-duration: 1ms; }
  .lb-track.lb-animate,
  .lb-layer.lb-animate { transition-duration: 1ms; }
}