/**
 * Starry Sky Background for Sub-pages
 * Dynamic starfield with shooting meteors
 */

.starry-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background: linear-gradient(180deg, #0b1026 0%, #1a1a40 40%, #0f0c29 100%);
  overflow: hidden;
}

.star {
  position: absolute;
  background: white;
  border-radius: 50%;
  animation: twinkle var(--duration) ease-in-out infinite;
  opacity: 0;
}

@keyframes twinkle {
  0%, 100% { opacity: 0; transform: scale(0.5); }
  50% { opacity: var(--max-opacity); transform: scale(1); }
}

.meteor {
  position: absolute;
  width: 100px;
  height: 2px;
  background: linear-gradient(90deg, transparent, #fff, transparent);
  border-radius: 2px;
  opacity: 0;
  animation: shoot var(--speed) linear infinite;
  animation-delay: var(--delay);
}

.meteor::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  width: 4px;
  height: 4px;
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 0 6px 2px rgba(255,255,255,0.5);
}

@keyframes shoot {
  0% {
    transform: translateX(-100px) translateY(0) rotate(var(--angle));
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  90% {
    opacity: 1;
  }
  100% {
    transform: translateX(100vw) translateY(60vh) rotate(var(--angle));
    opacity: 0;
  }
}

.nebula {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.15;
  animation: nebula-drift 20s ease-in-out infinite alternate;
}

@keyframes nebula-drift {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(30px, -20px) scale(1.1); }
}