/*
 * Optional home-page-to-space transition.
 * This file is loaded only while space_journey.enabled is true.
 *
 * Launch timeline, from the moment the hold completes:
 *   0.00s  meteors ignite, suction particles start, portal opens
 *   0.48s  gravitational lens starts bending the page behind it
 *   0.70s  the page itself collapses into the portal
 *   1.82s  hyperspace streaks
 *   1.88s  white flash, settling into deep space
 *   2.45s  navigation
 */

html.space-launch-charging::after {
  position: fixed;
  z-index: 19;
  inset: 0;
  background:
    radial-gradient(circle at var(--portal-x) var(--portal-y), rgba(126, 238, 255, 0.22), transparent 6rem),
    radial-gradient(circle at var(--portal-x) var(--portal-y), transparent 0 5rem, rgba(0, 4, 14, 0.82) 72%);
  content: "";
  opacity: 0;
  pointer-events: none;
  animation: space-charge-atmosphere 4s linear forwards;
  backdrop-filter: brightness(0.82) saturate(0.88);
}

/* Beat 1 — star dust drawn toward the logo while the ring charges. */
.space-charge-field {
  position: fixed;
  z-index: 2147483646;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.space-charge-field i {
  position: absolute;
  top: var(--start-y);
  left: var(--start-x);
  width: 0;
  height: 0;
  opacity: 0;
  will-change: transform, opacity;
  animation: space-charge-drift var(--duration) var(--delay) cubic-bezier(0.48, 0, 0.88, 0.45) infinite;
}

.space-charge-field i::before {
  position: absolute;
  top: calc(var(--trail-thickness) * -0.5);
  left: calc(var(--trail-length) * -1);
  width: var(--trail-length);
  height: var(--trail-thickness);
  border-radius: 999px;
  background: linear-gradient(90deg, transparent, rgba(218, 247, 255, 0.38) 42%, #fff);
  box-shadow:
    0 0 0.3rem rgba(255, 255, 255, 0.8),
    0 0 0.8rem rgba(170, 232, 255, 0.72);
  content: "";
  transform: rotate(var(--particle-angle));
  transform-origin: 100% 50%;
}

.space-charge-field i::after {
  position: absolute;
  top: calc(var(--head-size) * -0.5);
  left: calc(var(--head-size) * -0.5);
  width: var(--head-size);
  height: var(--head-size);
  border-radius: 50%;
  background: #fff;
  box-shadow:
    0 0 0.35rem #fff,
    0 0 0.9rem rgba(157, 226, 255, 0.95);
  content: "";
}

/* Beat 2 — page blocks fly into the portal, keeping their real styling. */
.space-meteor {
  will-change: transform, opacity, filter;
  animation: space-meteor-fly 900ms var(--meteor-delay) cubic-bezier(0.55, 0, 0.85, 0.35) forwards;
}

.space-transition__trail {
  position: absolute;
  z-index: 2;
  top: var(--trail-y);
  left: var(--trail-x);
  width: var(--trail-length);
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(158, 238, 255, 0.95));
  opacity: 0;
  transform-origin: 0 50%;
  will-change: transform, opacity;
  animation: space-trail-streak 860ms var(--trail-delay) cubic-bezier(0.5, 0, 0.85, 0.4) forwards;
}

/* Beat 3 — the page is pulled apart by gravity and swallowed. */
html.space-transition-active {
  overflow: hidden;
  background: #01030a;
  perspective: 1500px;
  perspective-origin: var(--portal-origin-x, 50vw) var(--portal-origin-y, 3rem);
}

html.space-transition-active body {
  overflow: hidden;
  transform-origin: var(--portal-origin-x, 50vw) var(--portal-origin-y, 3rem);
  transform-style: preserve-3d;
  will-change: transform, opacity, filter, border-radius;
  animation: space-gravity-collapse 1350ms 700ms cubic-bezier(0.6, 0, 0.85, 0.3) forwards;
  backface-visibility: visible;
}

.space-transition-overlay {
  position: fixed;
  z-index: 2147483647;
  inset: 0;
  overflow: hidden;
  background:
    radial-gradient(circle at var(--portal-x) var(--portal-y), rgba(42, 159, 255, 0.12), transparent 10rem),
    rgba(0, 2, 8, 0);
  opacity: 0;
  pointer-events: all;
  animation: space-overlay-arrive 2.45s ease forwards;
  isolation: isolate;
}

.space-transition-overlay::before {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 12% 18%, #fff 0 1px, transparent 1.5px),
    radial-gradient(circle at 78% 22%, #9ceaff 0 1px, transparent 1.5px),
    radial-gradient(circle at 32% 72%, #fff 0 0.8px, transparent 1.4px),
    radial-gradient(circle at 91% 66%, #adc8ff 0 1px, transparent 1.6px);
  background-size: 17rem 15rem, 23rem 19rem, 13rem 21rem, 29rem 17rem;
  content: "";
  opacity: 0;
  transform: scale(1.3);
  animation: space-stars-reveal 1.5s 0.9s ease forwards;
}

/* Gravitational lensing: everything behind the disc gets bent and desaturated. */
.space-transition__lens {
  position: absolute;
  z-index: 1;
  top: var(--portal-y);
  left: var(--portal-x);
  width: 9rem;
  aspect-ratio: 1;
  border-radius: 50%;
  box-shadow:
    0 0 3.5rem rgba(120, 220, 255, 0.42),
    inset 0 0 2.5rem rgba(0, 0, 0, 0.92);
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.12);
  will-change: transform, opacity;
  animation: space-lens-bend 1650ms 480ms cubic-bezier(0.5, 0, 0.62, 1) forwards;
  backdrop-filter: blur(6px) saturate(1.7) hue-rotate(200deg) contrast(1.22);
}

.space-transition__portal {
  position: absolute;
  z-index: 3;
  top: var(--portal-y);
  left: var(--portal-x);
  width: 8rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background:
    radial-gradient(circle, #fff 0 3%, #9ff5ff 5%, #268dff 12%, rgba(44, 80, 226, 0.88) 22%, rgba(27, 10, 70, 0.78) 39%, transparent 66%);
  box-shadow:
    0 0 1.8rem rgba(109, 230, 255, 0.95),
    0 0 7rem rgba(59, 117, 255, 0.68),
    inset 0 0 1.4rem #fff;
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.08) rotate(0);
  animation: space-portal-open 1950ms cubic-bezier(0.2, 0.72, 0.2, 1) forwards;
}

.space-transition__portal::before,
.space-transition__portal::after {
  position: absolute;
  border-radius: 50%;
  content: "";
}

.space-transition__portal::before {
  inset: -13%;
  border: 1px solid rgba(139, 236, 255, 0.82);
  border-right-color: transparent;
  border-left-color: rgba(136, 92, 255, 0.68);
  box-shadow: 0 0 1rem rgba(91, 215, 255, 0.52);
  animation: space-ring-spin 0.72s linear infinite;
}

.space-transition__portal::after {
  inset: -35%;
  border: 1px solid rgba(107, 157, 255, 0.3);
  border-top-color: rgba(203, 250, 255, 0.82);
  transform: rotate(33deg);
  animation: space-ring-spin 1.15s linear infinite reverse;
}

.space-transition__particle {
  position: absolute;
  z-index: 2;
  top: var(--start-y);
  left: var(--start-x);
  width: var(--size);
  height: var(--size);
  border-radius: 50%;
  background: #d8f8ff;
  box-shadow: 0 0 0.5rem #61cfff;
  opacity: 0;
  will-change: transform, opacity;
  animation: space-particle-suction var(--duration) var(--delay) cubic-bezier(0.56, 0, 1, 0.46) forwards;
}

/* Beat 4 — hyperspace jump out of the collapsed portal. */
.space-transition__streak {
  position: fixed;
  z-index: 4;
  top: var(--portal-y);
  left: var(--portal-x);
  width: var(--streak-length);
  height: var(--streak-thickness);
  background: linear-gradient(90deg, rgba(255, 255, 255, 0), #eaffff);
  opacity: 0;
  transform-origin: 0 50%;
  will-change: transform, opacity;
  animation: space-hyperspace 640ms var(--streak-delay) cubic-bezier(0.4, 0, 0.9, 0.55) forwards;
}

.space-transition__flash {
  position: fixed;
  z-index: 2147483647;
  inset: 0;
  background:
    radial-gradient(circle at var(--portal-x) var(--portal-y), #fff 0 12%, #cdefff 34%, rgba(120, 190, 255, 0) 72%);
  opacity: 0;
  animation: space-flash-burst 570ms 1880ms ease-out forwards;
}

.space-transition__flash::before {
  position: fixed;
  top: var(--portal-y);
  left: var(--portal-x);
  width: 11rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, #fff 0 22%, #e8fbff 48%, rgba(126, 218, 255, 0) 78%);
  box-shadow:
    0 0 4rem rgba(255, 255, 255, 0.98),
    0 0 11rem rgba(103, 205, 255, 0.88);
  content: "";
  transform: translate(-50%, -50%);
}

.space-transition__status {
  position: absolute;
  z-index: 6;
  right: 0;
  bottom: max(2.25rem, env(safe-area-inset-bottom));
  left: 0;
  color: rgba(209, 244, 255, 0.82);
  font-family: "Courier New", monospace;
  font-size: clamp(0.55rem, 1vw, 0.7rem);
  letter-spacing: 0.28em;
  text-align: center;
  text-transform: uppercase;
  opacity: 0;
  animation: space-status-in 0.55s 1.12s ease forwards;
}

.space-transition__status::before {
  display: inline-block;
  width: 2.4rem;
  height: 1px;
  margin-right: 0.8rem;
  background: linear-gradient(90deg, transparent, #8beaff);
  content: "";
  vertical-align: middle;
}

/* Arrival back on the home page, after returning from the journey. */
html.space-return-active {
  overflow: hidden;
}

html.space-return-active [data-space-launch] {
  opacity: 0;
}

.space-return-arrival {
  position: fixed;
  z-index: 2147483647;
  inset: 0;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 50%, rgba(41, 145, 220, 0.22), transparent 16rem),
    #01030a;
  pointer-events: all;
  animation: space-return-backdrop 1.8s ease forwards;
}

.space-return-arrival::before {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 26%, #fff 0 1px, transparent 1.5px),
    radial-gradient(circle at 72% 18%, #8adfff 0 1px, transparent 1.6px),
    radial-gradient(circle at 84% 74%, #fff 0 0.8px, transparent 1.4px),
    radial-gradient(circle at 34% 81%, #9cbdff 0 1px, transparent 1.5px);
  background-size: 19rem 17rem, 27rem 21rem, 15rem 25rem, 23rem 19rem;
  content: "";
  animation: space-return-stars 1.1s ease forwards;
}

.space-return-arrival__avatar {
  position: absolute;
  z-index: 2;
  top: 50%;
  left: 50%;
  width: var(--return-size);
  filter: drop-shadow(0 0 2.5rem rgba(97, 218, 255, 0.82));
  image-rendering: pixelated;
  transform: translate(-50%, -50%);
  animation: space-avatar-dock 1.55s 0.08s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@keyframes space-charge-atmosphere {
  0% {
    opacity: 0;
  }

  25% {
    opacity: 0.24;
  }

  70% {
    opacity: 0.7;
  }

  100% {
    opacity: 1;
  }
}

@keyframes space-charge-drift {
  0% {
    opacity: 0;
    transform: translate3d(0, 0, 0);
  }

  22% {
    opacity: 1;
  }

  72% {
    opacity: 0.92;
  }

  100% {
    opacity: 0;
    transform: translate3d(var(--travel-x), var(--travel-y), 0);
  }
}

@keyframes space-meteor-fly {
  0% {
    filter: brightness(1) saturate(1);
    opacity: 1;
    transform: translate3d(0, 0, 0) scale(1) rotate(0);
  }

  22% {
    filter: brightness(1.5) saturate(1.45);
    opacity: 1;
  }

  100% {
    filter: brightness(3.2) saturate(1.9) blur(2px);
    opacity: 0;
    transform:
      translate3d(var(--meteor-x), var(--meteor-y), 0)
      scale(0.04)
      rotate(var(--meteor-spin));
  }
}

@keyframes space-trail-streak {
  0% {
    opacity: 0;
    transform: rotate(var(--trail-angle)) translateX(0) scaleX(0.08);
  }

  24% {
    opacity: 0.92;
    transform: rotate(var(--trail-angle)) translateX(calc(var(--trail-travel) * 0.22)) scaleX(0.7);
  }

  100% {
    opacity: 0;
    transform: rotate(var(--trail-angle)) translateX(var(--trail-travel)) scaleX(0.04);
  }
}

@keyframes space-gravity-collapse {
  0% {
    border-radius: 0;
    filter: brightness(1) saturate(1);
    opacity: 1;
    transform: translate3d(0, 0, 0) rotate(0) scale(1);
  }

  35% {
    border-radius: 6vw;
    filter: brightness(0.82) saturate(1.32) blur(0.4px);
    transform: translate3d(0, 0, -120px) rotate(-7deg) scale(0.86);
  }

  70% {
    border-radius: 26vw;
    filter: brightness(0.42) saturate(1.7) blur(2px);
    transform: translate3d(0, 0, -430px) rotate(-27deg) scale(0.4);
  }

  100% {
    border-radius: 50%;
    filter: brightness(0.05) saturate(2.4) blur(7px);
    opacity: 0;
    transform: translate3d(0, 0, -900px) rotate(-74deg) scale(0.02);
  }
}

@keyframes space-lens-bend {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.12);
  }

  18% {
    opacity: 1;
  }

  82% {
    opacity: 1;
  }

  100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(9);
  }
}

@keyframes space-overlay-arrive {
  0% {
    opacity: 0;
  }

  12%,
  100% {
    opacity: 1;
  }

  68% {
    background-color: rgba(0, 2, 9, 0.42);
  }

  100% {
    background-color: #01030a;
  }
}

@keyframes space-portal-open {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.08) rotate(0);
  }

  15% {
    opacity: 1;
  }

  52% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(0.85) rotate(150deg);
  }

  78% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.45) rotate(290deg);
  }

  100% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(32) rotate(420deg);
  }
}

@keyframes space-particle-suction {
  0% {
    opacity: 0;
    transform: translate3d(0, 0, 0) scale(0.4);
  }

  18% {
    opacity: 0.9;
  }

  70% {
    opacity: 0.75;
    transform: translate3d(var(--travel-x-mid), var(--travel-y-mid), 0) scale(1);
  }

  100% {
    opacity: 0;
    transform: translate3d(var(--travel-x), var(--travel-y), 0) scale(0.05);
  }
}

@keyframes space-hyperspace {
  0% {
    opacity: 0;
    transform: rotate(var(--streak-angle)) translateX(0) scaleX(0.05);
  }

  22% {
    opacity: 1;
  }

  100% {
    opacity: 0;
    transform: rotate(var(--streak-angle)) translateX(var(--streak-travel)) scaleX(1);
  }
}

@keyframes space-flash-burst {
  0% {
    opacity: 0;
  }

  42% {
    opacity: 1;
  }

  100% {
    opacity: 0;
  }
}

@keyframes space-stars-reveal {
  to {
    opacity: 0.9;
    transform: scale(1);
  }
}

@keyframes space-ring-spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes space-status-in {
  to {
    opacity: 1;
  }
}

@keyframes space-return-backdrop {
  0%,
  42% {
    opacity: 1;
  }

  100% {
    opacity: 0;
  }
}

@keyframes space-return-stars {
  from {
    opacity: 0.9;
    transform: scale(1);
  }

  to {
    opacity: 0;
    transform: scale(2.2);
  }
}

@keyframes space-avatar-dock {
  0% {
    filter: drop-shadow(0 0 2.5rem rgba(97, 218, 255, 0.82));
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }

  68% {
    filter: drop-shadow(0 0 1.2rem rgba(97, 218, 255, 0.48));
    opacity: 1;
  }

  100% {
    filter: drop-shadow(0 0 0 rgba(97, 218, 255, 0));
    opacity: 1;
    transform:
      translate(calc(-50% + var(--return-x)), calc(-50% + var(--return-y)))
      scale(var(--return-scale));
  }
}

/* Motion sensitivity is an accessibility preference, so it still collapses the
   whole sequence into a short fade even though the effect budget is uncapped. */
@media (prefers-reduced-motion: reduce) {
  html.space-transition-active body {
    animation: space-paper-fade 0.48s ease forwards;
  }

  .space-transition-overlay {
    animation-duration: 0.48s;
  }

  .space-transition__lens,
  .space-transition__flash {
    animation: none;
    opacity: 0;
  }

  .space-transition__portal {
    animation: space-portal-fade 0.48s ease forwards;
  }

  .space-transition__particle,
  .space-transition__streak,
  .space-transition__trail,
  .space-transition__status {
    display: none;
  }

  html.space-launch-charging::after {
    animation: none;
  }

  .space-return-arrival {
    animation-duration: 0.4s;
  }

  .space-return-arrival__avatar {
    animation-duration: 0.35s;
    animation-delay: 0s;
  }
}

@keyframes space-paper-fade {
  to {
    opacity: 0;
    transform: scale(0.96);
  }
}

@keyframes space-portal-fade {
  to {
    opacity: 1;
    transform: translate(-50%, -50%) scale(20);
  }
}