/* Train-from-tunnel — cinematic chamber emergence */

.tunnel-veil {
  position: fixed;
  inset: 0;
  z-index: 60;
  pointer-events: none;
  opacity: 0;
  transition: opacity 400ms var(--ease-silk);
}

body.is-labyrinth-active .tunnel-veil.is-visible {
  opacity: 1;
}

.tunnel-vignette {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 72% 58% at 50% 42%, transparent 0%, rgba(11, 11, 18, 0.22) 80%),
    linear-gradient(180deg, transparent 0%, transparent 72%, rgba(11, 11, 18, 0.28) 100%);
  opacity: calc(var(--tunnel-dark, 0) * 0.38);
  transition: opacity 80ms linear;
}

[data-theme="light"] .tunnel-vignette {
  background:
    radial-gradient(ellipse 72% 58% at 50% 42%, transparent 0%, rgba(90, 69, 212, 0.04) 82%),
    linear-gradient(180deg, transparent 0%, transparent 100%);
  opacity: calc(var(--tunnel-dark, 0) * 0.16);
}

.tunnel-light {
  position: absolute;
  top: 8%;
  left: 50%;
  width: 140%;
  height: 55%;
  transform: translateX(-50%);
  background: radial-gradient(
    ellipse at 50% 0%,
    rgba(201, 191, 255, calc(0.08 + var(--emerge, 0) * 0.22)) 0%,
    rgba(123, 97, 255, calc(0.02 + var(--emerge, 0) * 0.08)) 35%,
    transparent 70%
  );
  filter: blur(2px);
  opacity: calc(var(--tunnel-dark, 0) * 0.95);
  transition: opacity 80ms linear;
}

body.portal-client-active .tunnel-light {
  background: radial-gradient(
    ellipse at 50% 0%,
    rgba(255, 183, 183, calc(0.06 + var(--emerge, 0) * 0.18)) 0%,
    rgba(255, 146, 160, calc(0.02 + var(--emerge, 0) * 0.06)) 35%,
    transparent 70%
  );
}

.tunnel-rails {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 32%;
  background: linear-gradient(
    180deg,
    transparent 0%,
    rgba(11, 11, 18, calc(0.1 + var(--tunnel-dark, 0) * 0.28)) 100%
  );
  mask-image: linear-gradient(90deg, transparent, black 20%, black 80%, transparent);
  opacity: calc(var(--tunnel-dark, 0) * 0.55);
}

[data-theme="light"] .tunnel-rails {
  background: linear-gradient(
    180deg,
    transparent 0%,
    rgba(90, 69, 212, calc(0.04 + var(--tunnel-dark, 0) * 0.1)) 100%
  );
  opacity: calc(var(--tunnel-dark, 0) * 0.32);
}

.labyrinth.is-tunnel-active {
  --tunnel-shadow: 0 24px 80px rgba(0, 0, 0, calc(0.35 + var(--tunnel-dark, 0.4) * 0.35));
}

.chamber {
  perspective: 1200px;
}

.chamber-inner {
  transform-origin: 50% 42%;
  transform:
    scale(calc(0.86 + var(--ch-emerge, 0) * 0.14))
    translateY(calc((1 - var(--ch-emerge, 0)) * 48px))
    rotateX(calc((1 - var(--ch-emerge, 0)) * 4deg));
  filter:
    brightness(calc(0.78 + var(--ch-emerge, 0) * 0.22))
    blur(calc((1 - var(--ch-emerge, 0)) * 2.5px));
  box-shadow: var(--tunnel-shadow, none);
  transition:
    transform 120ms linear,
    filter 120ms linear,
    box-shadow 200ms var(--ease-silk);
}

.chamber.is-active .chamber-inner {
  filter:
    brightness(1)
    blur(0);
}

@media (prefers-reduced-motion: reduce) {
  .chamber-inner {
    transform: none;
    filter: none;
    transition: none;
  }

  .tunnel-vignette,
  .tunnel-light,
  .tunnel-rails {
    opacity: 0.3;
    transition: none;
  }
}