html, body {
  height: 100%;
  overflow: hidden;
  background: #000;
  color: #fff;
}

canvas {
  display: block;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 0;
}

.overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  z-index: 10;
}
.overlay.glass {
  position: relative;
  z-index: 1000 !important;
  color: white !important;
}

#neuro, .star-background, #3d-model {
  z-index: 0 !important;
}
.overlay.glass {
  text-shadow: 0 0 10px #fff;
  background-color: rgba(0, 0, 0, 0.6); /* darken for better contrast */
}

.overlay h1 {
  font-size: 3rem;
  letter-spacing: 0.2rem;
  margin-bottom: 1rem;
}

.overlay p {
  font-size: 1.1rem;
  color: #ccc;
  margin-bottom: 2rem;
}

.lead-form input[type=email] {
  padding: 0.75rem;
  border: none;
  width: 250px;
  border-radius: 5px 0 0 5px;
  font-size: 1rem;
}

.lead-form button {
  padding: 0.75rem 1.5rem;
  background-color: #05f;
  border: none;
  border-radius: 0 5px 5px 0;
  font-size: 1rem;
  cursor: pointer;
  color: #fff;
}