/* ==========================================================================
   lightbox-grid-light.css  —  LIGHT theme build
   Self-contained stylesheet for the Carousel / Masonry / Rows lightbox widget.

   Deployment: link EITHER this file OR lightbox-grid-dark.css — never both.
   Each file bundles the full widget structure plus one palette baked into the
   `.lbg` theme tokens below. To retheme, either edit the tokens here or copy
   this file and swap the palette.

   - BEM naming under the `lbg` block so styles do not leak into the host page.
   - CSS Custom Properties are the customization surface: override the variables
     on `.lbg` to re-theme without touching the JS.
   ========================================================================== */

/* ---- Theme tokens (LIGHT) — the only part that differs from the dark build - */
.lbg {
  --lbg-bg: #f5f6f8;
  --lbg-surface: #ffffff;
  --lbg-surface-2: #eef1f5;
  --lbg-text: #1b1f24;
  --lbg-muted: #5b636d;
  --lbg-accent: #e48521; /* navigation highlights: active mode/dots, focus */
  --lbg-accent-contrast: #1b1f24; /* dark text stays legible on the orange */
  --lbg-border: #d7dce2;
  --lbg-gap: 16px;
  --lbg-row-height: 240px; /* target row height for the justified grid */
  --lbg-radius: 10px;
  --lbg-transition: 240ms;
  --lbg-carousel-height: 420px;
  --lbg-shadow: 0 6px 24px rgba(20, 30, 50, 0.15);

  /* Lightbox overlay tokens */
  --lbg-overlay-bg: rgba(20, 28, 44, 0.55);
  --lbg-dialog-bg: #ffffff;
  --lbg-dialog-inset: 80px; /* bare viewport left visible either side of the dialog */
  --lbg-dialog-max-w: calc(100vw - 2 * var(--lbg-dialog-inset));
}

/* ---- Root block ---------------------------------------------------------- */
.lbg {
  box-sizing: border-box;
  color: var(--lbg-text);
  background: var(--lbg-bg);
  padding: var(--lbg-gap);
  border-radius: var(--lbg-radius);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.4;
}

.lbg *,
.lbg *::before,
.lbg *::after {
  box-sizing: inherit;
}

/* Hide the original source list once the widget has enhanced it. */
.lbg-source--enhanced {
  display: none !important;
}

/* ---- Toolbar / mode toggle ---------------------------------------------- */
.lbg__toolbar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: var(--lbg-gap);
}

.lbg__modes {
  display: inline-flex;
  border: 1px solid var(--lbg-border);
  border-radius: 999px;
  overflow: hidden;
  background: var(--lbg-surface);
}

.lbg__mode-btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--lbg-muted);
  font: inherit;
  font-size: 0.85rem;
  padding: 8px 16px;
  cursor: pointer;
  transition: background var(--lbg-transition), color var(--lbg-transition);
}

.lbg__mode-btn:hover {
  color: var(--lbg-text);
}

.lbg__mode-btn.is-active {
  background: var(--lbg-accent);
  color: var(--lbg-accent-contrast);
}

.lbg__mode-btn:focus-visible {
  outline: 2px solid var(--lbg-accent);
  outline-offset: -2px;
}

/* ---- Stage: only the active mode is shown ------------------------------- */
.lbg__carousel,
.lbg__grid {
  display: none;
}

.lbg--carousel .lbg__carousel {
  display: block;
}

.lbg--masonry .lbg__masonry,
.lbg--rows .lbg__rows {
  display: block;
}

/* ---- Shared item pieces -------------------------------------------------- */
.lbg__link {
  display: block;
  color: inherit;
  text-decoration: none;
  height: 100%;
}

.lbg__caption {
  display: block;
  padding: 10px 12px;
  font-size: 0.95rem;
  color: var(--lbg-text);
}

/* Optional title: an inline bold lead before the em-dash and link label. */
.lbg__title {
  font-weight: 700;
  color: var(--lbg-text);
}

/* Optional description: a muted secondary line beneath the caption. */
.lbg__desc {
  display: block;
  margin-top: 4px;
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--lbg-muted);
}

.lbg__image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ==========================================================================
   Carousel
   ========================================================================== */
.lbg__carousel {
  position: relative;
}

.lbg__viewport {
  overflow: hidden;
  border-radius: var(--lbg-radius);
}

.lbg__track {
  display: flex;
  transition: transform var(--lbg-transition) ease;
  will-change: transform;
}

.lbg__slide {
  flex: 0 0 100%;
  min-width: 100%;
}

.lbg__slide .lbg__link {
  background: var(--lbg-surface);
  border-radius: var(--lbg-radius);
  overflow: hidden;
}

.lbg__slide .lbg__media {
  display: block;
  width: 100%;
  height: var(--lbg-carousel-height);
  background: var(--lbg-surface-2);
}

/* Navigation arrows */
.lbg__nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--lbg-border);
  background: var(--lbg-surface);
  color: var(--lbg-text);
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--lbg-shadow);
  transition: background var(--lbg-transition), transform var(--lbg-transition);
}

.lbg__nav:hover {
  background: var(--lbg-surface-2);
}

.lbg__nav:focus-visible {
  outline: 2px solid var(--lbg-accent);
  outline-offset: 2px;
}

.lbg__nav--prev {
  left: 10px;
}

.lbg__nav--next {
  right: 10px;
}

/* Dots / indicators */
.lbg__dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: var(--lbg-gap);
}

.lbg__dot {
  width: 10px;
  height: 10px;
  padding: 0;
  border-radius: 50%;
  border: 1px solid var(--lbg-border);
  background: var(--lbg-surface-2);
  cursor: pointer;
}

.lbg__dot.is-active {
  background: var(--lbg-accent);
  border-color: var(--lbg-accent);
}

.lbg__dot:focus-visible {
  outline: 2px solid var(--lbg-accent);
  outline-offset: 2px;
}

/* ==========================================================================
   Grid modes — shared styling for the two JS-positioned grids:
     .lbg__masonry  = classic uniform-width columns, shortest-column packing.
     .lbg__rows     = justified "expanding rows" (photo-platform style): each
                      row shares one height and images keep their aspect ratio.
   Both absolutely position their .lbg__item cells; JS sets the geometry.
   ========================================================================== */
.lbg__grid {
  position: relative;
  width: 100%;
}

.lbg__grid .lbg__item {
  position: absolute;
  top: 0;
  left: 0;
  background: var(--lbg-surface);
  border-radius: var(--lbg-radius);
  overflow: hidden;
  box-shadow: var(--lbg-shadow);
  transition: transform var(--lbg-transition) ease,
    left var(--lbg-transition) ease, top var(--lbg-transition) ease;
}

.lbg__grid .lbg__item:hover {
  transform: translateY(-3px);
}

.lbg__grid .lbg__media {
  display: block;
  width: 100%;
  background: var(--lbg-surface-2);
  /* height set inline by JS from the image's intrinsic dimensions */
}

.lbg__grid .lbg__link:focus-visible {
  outline: 2px solid var(--lbg-accent);
  outline-offset: -2px;
}

/* Before JS lays it out, keep a graceful fallback flow. */
.lbg__grid.is-unlaid .lbg__item {
  position: static;
  display: inline-block;
  width: 240px;
  margin: 0 var(--lbg-gap) var(--lbg-gap) 0;
  vertical-align: top;
}

/* ==========================================================================
   Lightbox overlay (singleton, appended to <body>)
   ========================================================================== */
.lbg-lightbox {
  position: fixed;
  inset: 0;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px var(--lbg-dialog-inset, 80px);
}

.lbg-lightbox.is-open {
  display: flex;
}

.lbg-lightbox__backdrop {
  position: absolute;
  inset: 0;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--lbg-overlay-bg, rgba(20, 28, 44, 0.55));
}

.lbg-lightbox__dialog {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--lbg-dialog-max-w, calc(100vw - 160px));
  height: 82vh;
  background: var(--lbg-dialog-bg, #fff);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 12px 48px rgba(20, 30, 50, 0.25);
  display: flex;
  flex-direction: column;
}

.lbg-lightbox__close {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 2;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 0;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
}

.lbg-lightbox__close:hover {
  background: rgba(0, 0, 0, 0.8);
}

.lbg-lightbox__close:focus-visible {
  outline: 2px solid var(--lbg-accent);
  outline-offset: 2px;
}

.lbg-lightbox__frame {
  border: 0;
  width: 100%;
  height: 100%;
  flex: 1 1 auto;
  background: #fff;
}

.lbg-lightbox__spinner {
  position: absolute;
  inset: 0;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #555;
  font: 14px system-ui, sans-serif;
}

.lbg-lightbox.is-loaded .lbg-lightbox__spinner {
  display: none;
}

/* Prevent background scroll while the lightbox is open. */
.lbg-lightbox-open {
  overflow: hidden;
}

/* Narrow screens cannot spare 80px per side — fall back to a thin margin. */
@media (max-width: 640px) {
  :root {
    --lbg-dialog-inset: 16px;
  }
}

/* ==========================================================================
   Reduced motion
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  .lbg__track,
  .lbg__grid .lbg__item,
  .lbg__nav,
  .lbg__mode-btn {
    transition: none !important;
  }
}