.index-splash-page {
  display: grid;
  place-items: center;
}

.splash-screen {
  position: relative;
  z-index: 1;
  width: 100%;
  min-height: 100vh;
  display: grid;
  place-items: center;
  opacity: 1;
  overflow: hidden;
  transition: opacity 170ms ease;
}

.splash-screen::after {
  content: '';
  position: absolute;
  inset: -18%;
  background:
    radial-gradient(circle at center, rgba(88, 166, 255, 0.17) 0%, rgba(88, 166, 255, 0.05) 32%, rgba(13, 17, 23, 0.98) 66%),
    rgba(13, 17, 23, 1);
  opacity: 0;
  transform: scale(0.92);
  transition: opacity 170ms ease, transform 260ms ease;
  pointer-events: none;
  will-change: opacity, transform;
}

.splash-logo {
  display: inline-flex;
  align-items: baseline;
  font-family: 'Umbara', 'JetBrains Mono', monospace;
  font-weight: 700;
  line-height: 1;
  transform-origin: center center;
  transform: translateZ(0);
  backface-visibility: hidden;
  will-change: transform, opacity;
  user-select: none;
}

.splash-letter,
.splash-word {
  font-size: clamp(3.8rem, 13vw, 10.5rem);
  letter-spacing: 0.02em;
  background: linear-gradient(135deg, var(--accent), var(--purple));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.splash-letter {
  opacity: 0;
  transform: translate3d(0, 18px, 0) scale(0.86);
  transition: transform 220ms cubic-bezier(0.22, 1, 0.36, 1), opacity 150ms ease;
  transform-origin: center center;
  will-change: transform, opacity;
}

.splash-word {
  display: inline-block;
  max-width: 0;
  margin-left: 0.025em;
  opacity: 0;
  overflow: hidden;
  white-space: nowrap;
  transform-origin: left center;
  transform: translateX(-0.08em) scaleX(0.3);
  transition:
    max-width 300ms cubic-bezier(0.16, 1, 0.3, 1),
    transform 300ms cubic-bezier(0.16, 1, 0.3, 1),
    opacity 150ms ease;
  will-change: max-width, transform, opacity;
}

.index-splash-page.is-ready .splash-letter {
  opacity: 1;
  transform: translate3d(0, 0, 0) scale(1);
}

.index-splash-page.word-visible .splash-word {
  max-width: 8ch;
  opacity: 1;
  transform: translateX(0) scaleX(1);
}

.index-splash-page.word-collapse .splash-word {
  max-width: 0;
  opacity: 0;
  transform: translateX(-0.08em) scaleX(0.2);
}

.index-splash-page.pulse .splash-logo {
  animation: theorem-pulse 190ms cubic-bezier(0.22, 1, 0.36, 1) 1;
}

@keyframes theorem-pulse {
  0% { transform: scale(1); }
  55% { transform: scale(1.07); }
  100% { transform: scale(1); }
}

.index-splash-page.zoom-t .splash-letter {
  transform: translate3d(0, 0, 0) scale(18);
  transition: transform 390ms cubic-bezier(0.18, 0.9, 0.2, 1), opacity 170ms ease;
}

.index-splash-page.zoom-t .splash-screen::after {
  opacity: 1;
  transform: scale(1.08);
}

.index-splash-page.merge-out .splash-screen {
  opacity: 0;
}

@media (max-width: 640px) {
  .index-splash-page.zoom-t .splash-letter {
    transform: translate3d(0, 0, 0) scale(14);
  }
}

@media (prefers-reduced-motion: reduce) {
  .splash-letter,
  .splash-word,
  .splash-screen,
  .splash-screen::after {
    transition-duration: 80ms;
    animation: none;
  }
}