body {
  margin: 0;
  overflow: hidden;
}

canvas {
  width: 100vw;
  height: 100vh;
  display: block;
}

.controls-container {
  position: absolute;
  top: 10px;
  left: 10px;
  padding: 10px;
  color: white;

  /* From https://css.glass */
  background: rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

button {
  background-color: transparent;
  border: none;
  cursor: pointer;

  i {
    color: white;
  }
}

.controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.controls button, .controls label, .controls input, .controls select {
  font-size: 16px;
}

.focus-selector {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 4px;
  padding: 5px 10px;
  cursor: pointer;
}

.focus-selector option {
  background: rgba(0, 0, 0, 0.8);
  color: white;
}

.simulation-time {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 20px;
  color: white;
  font-size: 18px;
  font-weight: bold;
  text-align: center;

  background: rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.9);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  opacity: 1;
  visibility: visible;
}

.loading-overlay.hidden {
  opacity: 0;
  visibility: hidden;
}

.loading-content {
  text-align: center;
  color: white;
  max-width: 400px;
  padding: 40px;

  background: rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.loading-spinner {
  width: 60px;
  height: 60px;
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-top: 4px solid #fff;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 20px;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.loading-content h2 {
  margin: 0 0 10px 0;
  font-size: 24px;
  font-weight: 300;
}