/* Homepage hero only: keep the existing square, halo and layout unchanged. */
.logo-switch {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 1;
  padding: 0;
  border: 0;
  border-radius: 23%;
  overflow: hidden;
  isolation: isolate;
  appearance: none;
  background: #050817;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  box-shadow: 0 34px 90px rgba(0,0,0,.38), 0 0 0 1px rgba(240,248,250,.08);
}

.logo-switch:focus-visible {
  outline: 3px solid var(--accent-a);
  outline-offset: 6px;
}

.logo-switch .app-icon {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  aspect-ratio: auto;
  border-radius: inherit;
  box-shadow: none;
}

.kanji-panel {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at 50% 43%, #15213b 0%, #091024 54%, #040713 100%);
  opacity: 0;
  pointer-events: none;
  transition: opacity 750ms ease-in-out;
}

.logo-switch.is-kanji .kanji-panel { opacity: 1; }
.logo-switch.is-autoplay .kanji-panel { transition-duration: 1200ms; }

.kanji-image {
  width: auto;
  height: 76%;
  max-width: 74%;
  object-fit: contain;
  opacity: .8;
  /* Matches the ColorFilter.matrix applied to the same asset in the Flutter app. */
  filter: url('#kanji-ink');
}

.logo-svg-filter {
  position: absolute;
  width: 0;
  height: 0;
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  .kanji-panel { transition: none; }
}