body {
  margin: 0;
  padding: 0;
  color: rgba(255, 255, 255, 0.87);
  background-color: #000001;
  overflow: hidden;
}

#app {
  width: 100vw;
  height: 100vh;
  position: relative;
}

#pixi-container {
  width: 100%;
  height: 100%;
}

#start-button {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  padding: 20px 40px;
  font-size: 24px;
  font-weight: bold;
  color: #ecf0f1;
  background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
  border: 3px solid #c0392b;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(231, 76, 60, 0.4);
  z-index: 1000;
  font-family: Arial, sans-serif;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

#start-button:disabled {
  opacity: 0.6;
  cursor: wait;
  background: linear-gradient(135deg, #95a5a6 0%, #7f8c8d 100%);
  border-color: #7f8c8d;
}

#start-button:hover {
  transform: translate(-50%, -50%) scale(1.05);
  box-shadow: 0 6px 20px rgba(231, 76, 60, 0.6);
}

#start-button:active {
  transform: translate(-50%, -50%) scale(0.98);
}

#start-button.fade-out {
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.8);
  pointer-events: none;
}