/* ===================================================================
 * 2B Shared Element Gallery
 * Vanilla port of 21st.dev "Shared Element Gallery" (easemize)
 * - CSS-column masonry that preserves native aspect ratios
 * - Click-to-expand lightbox with View Transitions API
 *   (smooth morph from thumb rect to fullscreen)
 * - Drag-to-dismiss, frosted backdrop, keyboard support
 * - No framer-motion dependency
 * =================================================================== */

.se-gallery {
  position: relative;
  --se-gap: 0.9rem;
  --se-radius: 10px;
}

.se-gallery__grid {
  column-count: 1;
  column-gap: var(--se-gap);
  margin: 0;
  padding: 0;
  list-style: none;
}
@media (min-width: 560px) { .se-gallery__grid { column-count: 2; } }
@media (min-width: 880px) { .se-gallery__grid { column-count: 3; } }
@media (min-width: 1200px) { .se-gallery__grid { column-count: 4; } }

.se-gallery__item {
  display: block;
  margin: 0 0 var(--se-gap);
  break-inside: avoid;
  position: relative;
  overflow: hidden;
  border-radius: var(--se-radius);
  background: var(--panel, #0e121a);
  border: 1px solid var(--line, #1c2230);
  cursor: zoom-in;
  transform: translateZ(0);
  transition: transform 0.35s cubic-bezier(0.2, 0.7, 0.2, 1),
              border-color 0.25s ease,
              box-shadow 0.25s ease;
  view-transition-name: none;
}
.se-gallery__item:hover {
  border-color: rgba(255, 176, 46, 0.45);
  box-shadow: 0 18px 50px -20px rgba(0, 0, 0, 0.6),
              0 0 0 1px rgba(255, 176, 46, 0.18);
  transform: translateY(-2px);
}
.se-gallery__item img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--se-radius);
  background: #000;
  -webkit-user-drag: none;
  user-select: none;
}

.se-gallery__caption {
  position: absolute;
  inset: auto 0 0 0;
  padding: 1.25rem 1rem 0.75rem;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.85) 0%, rgba(0, 0, 0, 0) 100%);
  color: #fff;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.25s ease, transform 0.25s ease;
  pointer-events: none;
}
.se-gallery__item:hover .se-gallery__caption,
.se-gallery__item:focus-visible .se-gallery__caption {
  opacity: 1;
  transform: translateY(0);
}
.se-gallery__caption-title {
  display: block;
  font-weight: 700;
  font-family: var(--font-heading, "Syne", system-ui);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  text-transform: none;
}
.se-gallery__caption-meta {
  display: block;
  font-size: 0.7rem;
  color: rgba(255, 255, 255, 0.65);
  margin-top: 0.2rem;
}

/* ---------- Lightbox ---------- */
.se-lightbox {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4vh 4vw;
  background: rgba(5, 7, 10, 0.0);
  backdrop-filter: blur(0px);
  -webkit-backdrop-filter: blur(0px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.32s ease, background-color 0.32s ease, backdrop-filter 0.32s ease;
}
.se-lightbox.is-open {
  opacity: 1;
  pointer-events: auto;
  background: rgba(5, 7, 10, 0.78);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
}

.se-lightbox__stage {
  position: relative;
  max-width: min(1200px, 92vw);
  max-height: 88vh;
  border-radius: 14px;
  overflow: hidden;
  transform: scale(0.96);
  transition: transform 0.36s cubic-bezier(0.2, 0.7, 0.2, 1);
  box-shadow: 0 40px 120px -30px rgba(0, 0, 0, 0.7);
}
.se-lightbox.is-open .se-lightbox__stage {
  transform: scale(1);
}

.se-lightbox__img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 88vh;
  object-fit: contain;
  background: #000;
}

.se-lightbox__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 1.5rem 1.75rem 1.25rem;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.85), rgba(0, 0, 0, 0));
  color: #fff;
  font-family: var(--font-heading, "Syne", system-ui);
}
.se-lightbox__caption h3 {
  margin: 0 0 0.25rem;
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}
.se-lightbox__caption p {
  margin: 0;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
}

.se-lightbox__close,
.se-lightbox__nav {
  position: absolute;
  top: 1.25rem;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(0, 0, 0, 0.45);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  transition: background 0.2s ease, transform 0.2s ease;
  backdrop-filter: blur(6px);
  z-index: 2;
}
.se-lightbox__close {
  right: 1.25rem;
}
.se-lightbox__nav {
  top: 50%;
  transform: translateY(-50%);
  width: 3rem;
  height: 3rem;
  font-size: 1.4rem;
}
.se-lightbox__nav--prev { left: 1.25rem; }
.se-lightbox__nav--next { right: 1.25rem; }
.se-lightbox__close:hover,
.se-lightbox__nav:hover {
  background: rgba(255, 255, 255, 0.18);
  transform: translateY(calc(-50%)) scale(1.05);
}
.se-lightbox__close:hover {
  transform: scale(1.05);
}

/* ---------- View Transitions (shared element morph) ---------- */
@supports (view-transition-name: a) {
  .se-gallery__item.is-active {
    view-transition-name: se-gallery-image;
  }
  ::view-transition-old(se-gallery-image),
  ::view-transition-new(se-gallery-image) {
    animation-duration: 0.42s;
    animation-timing-function: cubic-bezier(0.2, 0.7, 0.2, 1);
  }
  ::view-transition-old(se-gallery-image) {
    animation-name: se-fade-out;
  }
  ::view-transition-new(se-gallery-image) {
    animation-name: se-zoom-in;
  }
}

@keyframes se-fade-out {
  to { opacity: 0; }
}
@keyframes se-zoom-in {
  from { opacity: 0; transform: scale(0.94); }
}

/* ---------- Drag-to-dismiss ---------- */
.se-lightbox__stage.is-dragging {
  transition: none;
}

/* ---------- Mobile ---------- */
@media (max-width: 720px) {
  .se-lightbox { padding: 0; }
  .se-lightbox__stage {
    max-width: 100vw;
    max-height: 100vh;
    height: 100vh;
    border-radius: 0;
  }
  .se-lightbox__img {
    height: 100vh;
    object-fit: contain;
  }
  .se-lightbox__nav--prev { left: 0.5rem; }
  .se-lightbox__nav--next { right: 0.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  .se-lightbox,
  .se-lightbox__stage,
  .se-gallery__item { transition-duration: 0.01ms !important; }
  .se-gallery__item:hover { transform: none; }
}