/**
 * Layered deep-space background + command-deck foreground
 */

.ttb-universe {
  position: fixed;
  inset: 0;
  z-index: -10;
  overflow: hidden;
  background: var(--ttb-void-deep);
  pointer-events: none;
}

.ttb-universe__nebula {
  position: absolute;
  inset: -25%;
  background:
    radial-gradient(ellipse 55% 45% at 18% 28%, oklch(0.45 0.2 285 / 0.55), transparent 58%),
    radial-gradient(ellipse 50% 40% at 82% 62%, oklch(0.4 0.16 220 / 0.5), transparent 55%),
    radial-gradient(ellipse 40% 35% at 48% 88%, oklch(0.35 0.14 25 / 0.28), transparent 50%);
  animation: ttb-nebula-drift 100s ease-in-out infinite alternate;
}

.ttb-universe__stars {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 20% 30%, oklch(0.95 0.02 265 / 0.9), transparent),
    radial-gradient(1px 1px at 40% 70%, oklch(0.9 0.02 265 / 0.7), transparent),
    radial-gradient(1.5px 1.5px at 60% 20%, oklch(0.95 0.03 200 / 0.85), transparent),
    radial-gradient(1px 1px at 80% 50%, oklch(0.92 0.02 265 / 0.75), transparent),
    radial-gradient(1px 1px at 10% 80%, oklch(0.88 0.02 265 / 0.6), transparent),
    radial-gradient(1.2px 1.2px at 90% 15%, oklch(0.95 0.03 200 / 0.8), transparent);
  background-size: 280px 280px, 320px 320px, 240px 240px, 360px 360px, 300px 300px, 260px 260px;
  animation: ttb-stars-drift 120s linear infinite;
  opacity: 0.85;
}

.ttb-universe__stars--far {
  background-size: 420px 420px, 480px 480px, 400px 400px;
  opacity: 0.45;
  animation-duration: 200s;
  animation-direction: reverse;
}

.ttb-universe__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(oklch(0.72 0.14 200 / 0.04) 1px, transparent 1px),
    linear-gradient(90deg, oklch(0.72 0.14 200 / 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, oklch(0.1 0 0) 20%, transparent 75%);
  opacity: 0.5;
}

.ttb-universe__scan {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    transparent 0%,
    oklch(0.78 0.14 200 / 0.03) 48%,
    transparent 52%
  );
  background-size: 100% 8px;
  animation: ttb-scan 8s linear infinite;
  opacity: 0.35;
}

@keyframes ttb-nebula-drift {
  from {
    transform: translate(0, 0) scale(1);
  }
  to {
    transform: translate(-3%, 2%) scale(1.05);
  }
}

@keyframes ttb-stars-drift {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(-120px);
  }
}

@keyframes ttb-scan {
  from {
    background-position: 0 -100%;
  }
  to {
    background-position: 0 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ttb-universe__nebula,
  .ttb-universe__stars,
  .ttb-universe__stars--far,
  .ttb-universe__scan {
    animation: none;
  }
}

/* Command deck: elevated foreground */
.ttb-deck {
  position: relative;
  z-index: 1;
  max-width: var(--ttb-layout-max);
  margin: 0 auto;
  padding: 0 var(--ttb-layout-gutter) 2.5rem;
}

.ttb-deck::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 5%;
  right: 5%;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--ttb-border-glow),
    oklch(0.78 0.16 200 / 0.6),
    var(--ttb-border-glow),
    transparent
  );
  pointer-events: none;
}

.ttb-panel {
  background: var(--ttb-surface-raised);
  border: 1px solid var(--ttb-border-strong);
  border-radius: var(--ttb-radius-lg);
  box-shadow: var(--ttb-shadow-md), inset 0 1px 0 oklch(1 0.01 265 / 0.06);
  backdrop-filter: blur(16px);
}

.ttb-panel--glow {
  box-shadow:
    var(--ttb-shadow-md),
    var(--ttb-glow-signal),
    inset 0 1px 0 oklch(1 0.01 265 / 0.08);
}