/* ═══════════════════════════════════════════════════════════════════════════
   BACKGROUND — Sky, ground, moon/sun, stars, trees, bushes
   ═══════════════════════════════════════════════════════════════════════════ */

/* Sky / background */
#sky {
  position: fixed;
  inset: 0;
  bottom: 80px;
  background: linear-gradient(180deg, #0d0221 0%, #1a0533 50%, #2d0d4e 100%);
  overflow: hidden;
}
.star {
  position: absolute;
  border-radius: 50%;
  animation: twinkle var(--d, 2s) infinite alternate;
}
@keyframes twinkle {
  0% {
    opacity: 0.2;
  }
  100% {
    opacity: 1;
  }
}

/* Ground */
#ground {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 80px;
  background: var(--grass);
  border-top: 4px solid #22692e;
  z-index: 100;
  overflow: hidden;
}
#ground::before {
  content: "";
  position: absolute;
  inset: 0;
  top: auto;
  bottom: 0;
  height: 40px;
  background: var(--dirt);
  border-top: 3px solid #5c3d2e;
}

/* Sun — absolute inside #sky, behind targets (z-index 200) */
#moon {
  position: absolute;
  top: 80px;
  right: 10%;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #ffe9a0, #f5c842);
  box-shadow:
    0 0 30px #ffe600,
    0 0 60px rgba(255, 230, 0, 0.3);
  z-index: 5;
  animation: moonFloat 6s ease-in-out infinite;
  cursor: none;
  transition: filter 0.3s;
}
#moon:hover {
  filter: brightness(1.4) drop-shadow(0 0 20px #ffe600);
}
#moon.moon-shot {
  filter: brightness(3) drop-shadow(0 0 40px #ffe600);
}
@keyframes moonFloat {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

/* Stars */
#stars {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 10;
}

/* Pixel trees */
.tree {
  position: absolute;
  bottom: 80px;
  z-index: 150;
}

/* Neon bush */
.bush {
  position: absolute;
  bottom: 80px;
  border-radius: 50% 50% 0 0;
  background: var(--grass);
  z-index: 160;
}