/* ─── Reset & Base ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { width: 100%; height: 100%; overflow: hidden;  }

/* ─── Root ─── */
.sphere-root {
  position: relative;
  width: 100%;
  height: 100%;
  --radius: 520px;
  --viewer-pad: 72px;
  --segments-x: 35;
  --segments-y: 35;
  --circ: calc(var(--radius) * 3.14159);
  --rot-y: calc((360deg / var(--segments-x)) / 2);
  --rot-x: calc((360deg / var(--segments-y)) / 2);
  --item-width: calc(var(--circ) / var(--segments-x));
  --item-height: calc(var(--circ) / var(--segments-y));
  --overlay-blur-color: #060010;
  --tile-radius: 30px;
  --enlarge-radius: 30px;
  --image-filter: grayscale(1);
}

.sphere-root * { box-sizing: border-box; }

.sphere,
.item,
.item__image {
  transform-style: preserve-3d;
}

main.sphere-main {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  overflow: hidden;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  background: transparent;
}

.stage {
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  perspective: calc(var(--radius) * 2);
  perspective-origin: 50% 50%;
  contain: layout paint size;
}

.sphere {
  transform: translateZ(calc(var(--radius) * -1));
  will-change: transform;
}

.overlay,
.overlay--blur {
  position: absolute;
  inset: 0;
  margin: auto;
  z-index: 3;
  pointer-events: none;
}

.item {
  width: calc(var(--item-width) * var(--item-size-x, 2));
  height: calc(var(--item-height) * var(--item-size-y, 2));
  position: absolute;
  top: -999px; bottom: -999px;
  left: -999px; right: -999px;
  margin: auto;
  transform-origin: 50% 50%;
  backface-visibility: hidden;
  transition: transform 300ms;
  transform:
    rotateY(calc(var(--rot-y) * (var(--offset-x) + ((var(--item-size-x, 2) - 1) / 2)) + var(--rot-y-delta, 0deg)))
    rotateX(calc(var(--rot-x) * (var(--offset-y) - ((var(--item-size-y, 2) - 1) / 2)) + var(--rot-x-delta, 0deg)))
    translateZ(var(--radius));
}

.item__image {
  position: absolute;
  display: block;
  inset: 10px;
  border-radius: var(--tile-radius, 12px);
  background: #1a1a2e;
  overflow: hidden;
  backface-visibility: hidden;
  transition: transform 300ms;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  pointer-events: auto;
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
}

.item__image:focus { outline: none; }

.item__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
  backface-visibility: hidden;
  /* filter: var(--image-filter, none); */
}

/* placeholder color for missing images */
.item__image img[src=""] {
  background: #1a1a2e;
  display: block;
}

.viewer {
  position: absolute;
  inset: 0;
  z-index: 20;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--viewer-pad);
}

.viewer .frame {
  height: 100%;
  aspect-ratio: 1;
  border-radius: var(--enlarge-radius, 32px);
  display: flex;
}

@media (max-aspect-ratio: 1/1) {
  .viewer .frame { height: auto; width: 100%; }
}

.viewer .scrim {
  position: absolute;
  inset: 0;
  z-index: 10;
  background: rgba(0, 0, 0, 0.4);
  pointer-events: none;
  opacity: 0;
  transition: opacity 500ms ease;
  backdrop-filter: blur(3px);
}

.sphere-root[data-enlarging='true'] .viewer .scrim {
  opacity: 1;
  pointer-events: all;
}

.viewer .enlarge {
  position: absolute;
  z-index: 30;
  border-radius: var(--enlarge-radius, 32px);
  overflow: hidden;
  transition: transform 500ms ease, opacity 500ms ease;
  transform-origin: top left;
  box-shadow: 0 10px 30px rgba(0,0,0,0.35);
}

.viewer .enlarge img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  /* filter: var(--image-filter, none); */
}

.sphere-root .enlarge-closing img {
  filter: var(--image-filter, none);
}

.edge-fade {
  position: absolute;
  left: 0; right: 0;
  height: 120px;
  z-index: 5;
  pointer-events: none;
}

.edge-fade--top { top: 0; transform: rotate(180deg); }
.edge-fade--bottom { bottom: 0; }

.dg-scroll-lock { overflow: hidden !important; }

@media (min-width: 430px) and (max-width: 768px) {
  .viewer .enlarge img { text-align: center; }
}