/* ============================================================
   STACKED GALLERY — 3D peek-and-main multistate component
   See CLAUDE.md §15.

   Visual: one "main" item (large, in frame) + one "peek" item
   (smaller, bleeding off the left edge). On swap, the two trade places
   with a smooth transition.

   Modes (set as class on root):
     .sg-mode-swap     — peek click → swap; main click → follow href (default <a>)
     .sg-mode-lightbox — both items open the shared artwork-lightbox
                          (delegate via data-artwork-src on .sg-item)
     .sg-mode-static   — purely visual, no interaction

   Sizes/positions are controlled by CSS custom properties — override per page:
     --sg-stage-h, --sg-main-{w,h,x,y,z}, --sg-peek-{w,h,x,y,z,opacity}
   Defaults match the homepage Figma (landing::144:38).

   Optional info bar:
     <div class="sg-info">
       <span data-info="status"></span>
       <span data-info="date"></span>
       <span data-info="location"></span>
     </div>
   Each `data-info="X"` span is populated from the active main item's
   `data-info-X` attribute (any field name works).

   Media: each .sg-item may contain <img>, <video>, or both.
   Videos auto-play when main and pause when peek (component JS).
   ============================================================ */

.stacked-gallery{
  /* defaults match homepage mobile-cta Figma */
  --sg-stage-h: 380.05px;
  --sg-stage-bg: transparent;

  --sg-main-w: 234.58px;
  --sg-main-h: 292.05px;
  --sg-main-x: 62px;
  --sg-main-y: 44px;
  --sg-main-z: 2;

  --sg-peek-w: 147.91px;
  --sg-peek-h: 184.15px;
  --sg-peek-x: -117px;
  --sg-peek-y: 97.95px;
  --sg-peek-z: 1;
  --sg-peek-opacity: 1;

  --sg-transition-dur: .55s;
  --sg-transition-ease: cubic-bezier(.4,0,.2,1);

  display: flex;
  flex-direction: column;
  gap: 24px;
  width: 100%;
}

.stacked-gallery .sg-stack{
  position: relative;
  width: 100%;
  height: var(--sg-stage-h);
  background: var(--sg-stage-bg);
  overflow: hidden;
  user-select: none;
}

.stacked-gallery .sg-item{
  position: absolute;
  display: block;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  transition:
    left   var(--sg-transition-dur) var(--sg-transition-ease),
    top    var(--sg-transition-dur) var(--sg-transition-ease),
    width  var(--sg-transition-dur) var(--sg-transition-ease),
    height var(--sg-transition-dur) var(--sg-transition-ease),
    opacity .3s;
}

.stacked-gallery .sg-item img,
.stacked-gallery .sg-item video{
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  -webkit-user-drag: none;
  user-select: none;
  pointer-events: none; /* clicks go to the parent <a>/<button> */
}

/* MAIN (right, large) */
.stacked-gallery .sg-item.is-main{
  left:   var(--sg-main-x);
  top:    var(--sg-main-y);
  width:  var(--sg-main-w);
  height: var(--sg-main-h);
  z-index: var(--sg-main-z);
  opacity: 1;
}

/* PEEK (left bleed, smaller) */
.stacked-gallery .sg-item.is-peek{
  left:   var(--sg-peek-x);
  top:    var(--sg-peek-y);
  width:  var(--sg-peek-w);
  height: var(--sg-peek-h);
  z-index: var(--sg-peek-z);
  opacity: var(--sg-peek-opacity);
}
.stacked-gallery .sg-item.is-peek img,
.stacked-gallery .sg-item.is-peek video{
  object-position: right center;
}
.stacked-gallery .sg-item.is-peek::after{
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(0,0,0,.15) 0%, rgba(0,0,0,0) 60%);
  pointer-events: none;
}

/* mode: lightbox — zoom-in cursor hint */
.stacked-gallery.sg-mode-lightbox .sg-item{cursor: zoom-in}
/* mode: static — no cursor change, no transitions feel needed but keep for consistency */
.stacked-gallery.sg-mode-static .sg-item{cursor: default}

/* INFO BAR (optional) */
.stacked-gallery .sg-info{
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  max-width: 400px;
  font-family: "Copperplate","Times New Roman", serif;
  font-weight: 300;
  font-size: 16px;
  color: #1B1B1B;
  transition: opacity .25s;
}
.stacked-gallery .sg-info > span{
  width: 80px;
  font-family: inherit;
}
.stacked-gallery .sg-info > span:first-child{text-align: left}
.stacked-gallery .sg-info > span:nth-child(2){text-align: center}
.stacked-gallery .sg-info > span:last-child{text-align: right}
.stacked-gallery .sg-info.is-changing{opacity: .35}

/* a11y focus ring on peek (since main click goes through <a>) */
.stacked-gallery .sg-item:focus-visible{
  outline: 2px solid #1B1B1B;
  outline-offset: 2px;
}