.portal-transition {
  position: fixed;
  inset: 0;
  z-index: 10000;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  overflow: hidden;
  background: radial-gradient(circle at 50% 50%, #0a0a14 0%, #050508 70%);
}

.portal-transition.is-active.is-leaving,
.portal-transition.is-active.is-entering {
  visibility: visible;
  pointer-events: auto;
}

.portal-transition__vignette {
  position: absolute;
  inset: 0;
  background: radial-gradient(
    circle at 50% 50%,
    transparent 0%,
    rgba(0, 0, 0, 0.35) 55%,
    rgba(0, 0, 0, 0.92) 100%
  );
  opacity: 0;
}

.portal-transition__warp {
  position: absolute;
  inset: -20%;
  background: repeating-conic-gradient(
    from 0deg at 50% 50%,
    rgba(232, 220, 200, 0) 0deg 8deg,
    rgba(232, 220, 200, 0.1) 8deg 9deg
  );
  opacity: 0;
  transform: scale(0.2) rotate(0deg);
}

.portal-transition__core {
  position: absolute;
  top: 50%;
  left: 50%;
  width: min(40vmax, 420px);
  height: min(40vmax, 420px);
  transform: translate(-50%, -50%) scale(0);
  border-radius: 50%;
  background: radial-gradient(
    circle at 40% 35%,
    #fff 0%,
    #f2f0eb 12%,
    #e8dcc8 28%,
    #8a95a8 48%,
    transparent 72%
  );
  box-shadow:
    0 0 60px rgba(232, 220, 200, 0.45),
    0 0 120px rgba(197, 208, 222, 0.25);
  opacity: 0;
}

.portal-transition__label {
  position: absolute;
  left: 50%;
  bottom: 12%;
  transform: translateX(-50%);
  font-family: ui-monospace, Consolas, monospace;
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(232, 228, 239, 0.85);
  opacity: 0;
  white-space: nowrap;
}

.portal-transition.is-leaving .portal-transition__vignette {
  animation: portal-vignette-out 0.9s ease forwards;
}

.portal-transition.is-leaving .portal-transition__warp {
  animation: portal-warp-out 0.9s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.portal-transition.is-leaving .portal-transition__core {
  animation: portal-core-out 0.9s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.portal-transition.is-leaving .portal-transition__label {
  animation: portal-label-out 0.9s ease forwards;
}

.portal-transition.is-entering {
  opacity: 1;
}

.portal-transition.is-entering .portal-transition__vignette {
  animation: portal-vignette-in 0.85s ease forwards;
}

.portal-transition.is-entering .portal-transition__warp {
  animation: portal-warp-in 0.85s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.portal-transition.is-entering .portal-transition__core {
  animation: portal-core-in 0.85s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.portal-transition.is-entering .portal-transition__label {
  animation: portal-label-in 0.85s ease forwards;
}

@keyframes portal-vignette-out {
  to {
    opacity: 1;
  }
}

@keyframes portal-warp-out {
  0% {
    opacity: 0;
    transform: scale(0.35) rotate(0deg);
  }
  30% {
    opacity: 0.85;
  }
  100% {
    opacity: 1;
    transform: scale(2.8) rotate(48deg);
  }
}

@keyframes portal-core-out {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.1);
  }
  35% {
    opacity: 1;
  }
  100% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(3.5);
  }
}

@keyframes portal-label-out {
  0%,
  20% {
    opacity: 0;
  }
  40%,
  80% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

@keyframes portal-vignette-in {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

@keyframes portal-warp-in {
  from {
    opacity: 1;
    transform: scale(2.8) rotate(48deg);
  }
  to {
    opacity: 0;
    transform: scale(0.35) rotate(0deg);
  }
}

@keyframes portal-core-in {
  from {
    opacity: 1;
    transform: translate(-50%, -50%) scale(3.5);
  }
  to {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.05);
  }
}

@keyframes portal-label-in {
  from {
    opacity: 0;
  }
  30% {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

.mission-btn--universe {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.06),
    rgba(232, 220, 200, 0.18) 50%,
    rgba(138, 149, 168, 0.2)
  );
  color: var(--cor-texto-1);
  border: 1px solid rgba(197, 208, 222, 0.4);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.4);
}

.mission-btn--universe:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px var(--cor-glow);
  border-color: var(--cor-estrela);
}

@media (prefers-reduced-motion: reduce) {
  .portal-transition,
  .portal-transition * {
    animation: none !important;
    transition: none !important;
  }
}