/* <spin-viewer> — minimal dark theme. Override the custom properties to restyle. */
spin-viewer {
  --sv-bg: #0b0d10;
  --sv-fg: #e8ecef;
  --sv-accent: #39ff88;
  --sv-radius: 12px;
  display: block;
  position: relative;
  aspect-ratio: 1 / 1;
  max-width: 100%;
  overflow: hidden;
  background: var(--sv-bg);
  color: var(--sv-fg);
  border-radius: var(--sv-radius);
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}
spin-viewer.sv-spin { cursor: grab; touch-action: pan-y; }
spin-viewer.sv-drag { cursor: grabbing; }
spin-viewer:focus-visible { outline: 2px solid var(--sv-accent); outline-offset: 2px; }

spin-viewer > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  visibility: hidden;
  pointer-events: none;
}
spin-viewer > img.sv-on { visibility: visible; }
/* [crossfade]: a short blend between two real frames (never an interpolated image) */
spin-viewer[crossfade] > img { visibility: visible; opacity: 0; transition: opacity .16s linear; }
spin-viewer[crossfade] > img.sv-on { opacity: 1; }
@media (prefers-reduced-motion: reduce) { spin-viewer[crossfade] > img { transition: none; } }

/* "drag to rotate" hint: fades after first interaction */
spin-viewer .sv-hint {
  position: absolute;
  left: 50%;
  bottom: 14px;
  transform: translateX(-50%);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font: 500 13px/1.2 system-ui, sans-serif;
  letter-spacing: .02em;
  color: var(--sv-fg);
  background: rgb(0 0 0 / .55);
  border: 1px solid rgb(255 255 255 / .12);
  border-radius: 999px;
  pointer-events: none;
  transition: opacity .4s;
  white-space: nowrap;
}
spin-viewer .sv-hint svg { color: var(--sv-accent); }
spin-viewer.sv-used .sv-hint, spin-viewer[data-autoplaying] .sv-hint { opacity: 0; }

/* preload progress */
spin-viewer .sv-bar {
  position: absolute;
  left: 0; right: 0; top: 0;
  height: 3px;
  background: rgb(255 255 255 / .08);
  transition: opacity .3s;
}
spin-viewer .sv-bar i {
  display: block;
  height: 100%;
  width: calc(var(--sv-progress, 0) * 100%);
  background: var(--sv-accent);
  transition: width .2s;
}
spin-viewer:not([data-loading]) .sv-bar { opacity: 0; }

/* <3 frames: prev/next gallery */
spin-viewer .sv-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px; height: 44px;
  border: 1px solid rgb(255 255 255 / .15);
  border-radius: 50%;
  background: rgb(0 0 0 / .55);
  color: var(--sv-fg);
  font: 28px/1 system-ui, sans-serif;
  cursor: pointer;
}
spin-viewer .sv-prev { left: 10px; }
spin-viewer .sv-next { right: 10px; }
spin-viewer .sv-btn:focus-visible { outline: 2px solid var(--sv-accent); }

@media (prefers-reduced-motion: reduce) {
  spin-viewer .sv-hint, spin-viewer .sv-bar, spin-viewer .sv-bar i { transition: none; }
}