* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: #0a0a0f;
  color: #ffffff;
  overflow: hidden;
}

#viz-container {
  position: relative;
  width: 100vw;
  height: 100vh;
  background: 
    /* Deep space base */
    radial-gradient(ellipse at 30% 20%, rgba(25, 25, 60, 0.8) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 80%, rgba(40, 20, 50, 0.6) 0%, transparent 45%),
    radial-gradient(ellipse at 50% 50%, #12121f 0%, #08080d 100%);
}

/* Nebula clouds layer */
#viz-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    /* Purple nebula */
    radial-gradient(ellipse at 15% 25%, rgba(138, 43, 226, 0.12) 0%, transparent 35%),
    radial-gradient(ellipse at 85% 75%, rgba(75, 0, 130, 0.1) 0%, transparent 40%),
    /* Cyan nebula */
    radial-gradient(ellipse at 75% 20%, rgba(64, 224, 208, 0.08) 0%, transparent 30%),
    radial-gradient(ellipse at 25% 80%, rgba(0, 191, 255, 0.06) 0%, transparent 35%),
    /* Warm accent */
    radial-gradient(ellipse at 50% 40%, rgba(255, 140, 0, 0.04) 0%, transparent 25%);
  pointer-events: none;
  z-index: 1;
  animation: nebulaDrift 20s ease-in-out infinite alternate;
}

/* Star field layer */
#viz-container::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(1px 1px at 10% 15%, rgba(255, 255, 255, 0.4), transparent),
    radial-gradient(1px 1px at 25% 35%, rgba(255, 255, 255, 0.3), transparent),
    radial-gradient(1px 1px at 40% 10%, rgba(255, 255, 255, 0.5), transparent),
    radial-gradient(1px 1px at 55% 45%, rgba(255, 255, 255, 0.25), transparent),
    radial-gradient(1px 1px at 70% 25%, rgba(255, 255, 255, 0.35), transparent),
    radial-gradient(1px 1px at 85% 55%, rgba(255, 255, 255, 0.4), transparent),
    radial-gradient(1px 1px at 15% 65%, rgba(255, 255, 255, 0.3), transparent),
    radial-gradient(1px 1px at 30% 85%, rgba(255, 255, 255, 0.45), transparent),
    radial-gradient(1px 1px at 60% 70%, rgba(255, 255, 255, 0.3), transparent),
    radial-gradient(1px 1px at 90% 90%, rgba(255, 255, 255, 0.35), transparent),
    radial-gradient(1.5px 1.5px at 5% 50%, rgba(200, 220, 255, 0.5), transparent),
    radial-gradient(1.5px 1.5px at 95% 30%, rgba(255, 200, 200, 0.4), transparent),
    radial-gradient(2px 2px at 50% 5%, rgba(255, 255, 200, 0.6), transparent);
  pointer-events: none;
  z-index: 0;
  animation: starTwinkle 8s ease-in-out infinite;
}

@keyframes nebulaDrift {
  0% { opacity: 0.8; transform: scale(1); }
  100% { opacity: 1; transform: scale(1.02); }
}

@keyframes starTwinkle {
  0%, 100% { opacity: 0.7; }
  50% { opacity: 1; }
}

#canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
  z-index: 2; /* Above background layers */
}

/* UI Overlay */
.ui-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 10;
}

.ui-overlay > * {
  pointer-events: auto;
}

/* Title Bar */
.title-bar {
  position: absolute;
  top: 24px;
  left: 24px;
  opacity: 0.9;
}

.title-bar h1 {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: #ffffff;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

.title-bar .subtitle {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
  margin-top: 4px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* Removed perspective controls and info panel - data shown on axes */

/* Instructions */
.instructions {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
}

.instructions p {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.4);
  letter-spacing: 0.02em;
}

/* Responsive */
@media (max-width: 768px) {
  .title-bar {
    top: 16px;
    left: 16px;
  }
  
  .title-bar h1 {
    font-size: 1.2rem;
  }
  
  .instructions {
    bottom: 16px;
  }
  
  .instructions p {
    font-size: 0.7rem;
  }
}

/* Animations */
@keyframes pulse {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}