/* Subtle edge atmosphere, floating dust, and five crossing light trails. */
.space-background {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  user-select: none;
  overflow: hidden;
  contain: layout style;
  isolation: isolate;
  background:
    radial-gradient(circle at 8% 24%, rgb(254 200 205 / 12%) 0, transparent 22%),
    radial-gradient(circle at 93% 30%, rgb(210 225 255 / 8%) 0, transparent 24%),
    radial-gradient(circle at 5% 78%, rgb(255 255 255 / 6%) 0, transparent 19%),
    radial-gradient(circle at 96% 86%, rgb(254 200 205 / 8%) 0, transparent 21%),
    #030304;
}

.space-background__dust {
  position: absolute;
  left: var(--x);
  top: var(--y);
  width: var(--size);
  height: var(--size);
  border-radius: 50%;
  background: var(--color);
  opacity: var(--opacity);
  box-shadow: 0 0 var(--glow) color-mix(in srgb, var(--color) 76%, transparent);
  filter: blur(var(--blur));
  mix-blend-mode: screen;
  transform: translate3d(0, 0, 0);
  will-change: transform, opacity;
  animation: space-dust-float var(--duration) ease-in-out var(--delay) infinite alternate;
}

.space-background__comet {
  position: absolute;
  z-index: 1;
  left: var(--start-x);
  top: var(--start-y);
  width: var(--head);
  height: var(--head);
  border-radius: 50%;
  opacity: 0;
  will-change: transform, opacity;
  transform: translate3d(0, 0, 0);
  animation: space-comet-flight var(--duration) linear var(--delay) infinite;
}

.space-background__trail {
  position: absolute;
  top: 50%;
  right: 50%;
  width: var(--trail-length);
  height: var(--thickness);
  border-radius: 999px;
  background: linear-gradient(90deg,
    transparent 0,
    color-mix(in srgb, var(--tail-color) 26%, transparent) 28%,
    color-mix(in srgb, var(--tail-color) 64%, transparent) 68%,
    var(--head-color) 100%);
  box-shadow:
    0 0 var(--glow) color-mix(in srgb, var(--tail-color) 64%, transparent),
    0 0 calc(var(--glow) * .45) color-mix(in srgb, var(--head-color) 52%, transparent);
  transform: translateY(-50%) rotate(var(--angle));
  transform-origin: 100%;
}

.space-background__comet::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  border-radius: 50%;
  background: var(--head-color);
  box-shadow:
    0 0 calc(var(--head) * 2.4) color-mix(in srgb, var(--head-color) 88%, transparent),
    0 0 calc(var(--head) * 5.2) color-mix(in srgb, var(--tail-color) 56%, transparent);
}

@keyframes space-dust-float {
  0% {
    opacity: calc(var(--opacity) * .72);
    transform: translate3d(0, 0, 0) scale(.92);
  }
  48% {
    opacity: min(calc(var(--opacity) * 1.14), .72);
    transform: translate3d(calc(var(--drift) * .42), calc(var(--bob) * -.72), 0) scale(1);
  }
  100% {
    opacity: calc(var(--opacity) * .86);
    transform: translate3d(var(--drift), var(--bob), 0) scale(.88);
  }
}

@keyframes space-comet-flight {
  0% { opacity: 0; transform: translate3d(0, 0, 0); }
  6% { opacity: var(--opacity); transform: translate3d(var(--entry-x), var(--entry-y), 0); }
  94% { opacity: var(--opacity); transform: translate3d(var(--exit-x), var(--exit-y), 0); }
  100% { opacity: 0; transform: translate3d(var(--dx), var(--dy), 0); }
}

@media (max-width: 767px) {
  .space-background__dust[data-density="desktop"] { display: none; }
}

@media (max-width: 639px) {
  .space-background__dust[data-density="tablet"],
  .space-background__dust[data-side="center"] { display: none; }
  .space-background__dust {
    box-shadow: 0 0 calc(var(--glow) * .55) color-mix(in srgb, var(--color) 62%, transparent);
  }
}

@media (prefers-reduced-motion: reduce) {
  .space-background__dust {
    animation: none;
    opacity: calc(var(--opacity) * .72);
    transform: none;
    will-change: auto;
  }
  .space-background__comet { display: none; animation: none; will-change: auto; }
}