html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: #0f1621;
  color: rgba(255, 255, 255, 0.9);
  font-family: sans-serif;
}

body.intro {
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.intro-container {
  max-width: 480px;
  padding: 40px;
}

.intro-container h1 {
  font-size: 2rem;
  font-weight: 500;
  margin-bottom: 16px;
}

.intro-container p {
  font-size: 1rem;
  font-weight: 300;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.7);
}

.enter-btn {
  display: inline-block;
  margin-top: 32px;
  padding: 12px 36px;
  color: rgba(255, 255, 255);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 40px;
  text-decoration: none;
  background: rgba(255, 255, 255, 0.05);
  transition: all 0.3s ease;
  font-size: 0.9rem;
  letter-spacing: 0.1em;
}

.enter-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.7);
  transform: translateY(-1px);
}

body.experience {
  overflow: hidden;
}

#scene {
  display: block;
  width: 100%;
  height: 100%;
}

.prompt {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  pointer-events: none;
  opacity: 0;

  font-size: 1.2rem;
  letter-spacing: 0.15em;
  text-transform: lowercase;
  color: rgba(255, 255, 255, 0.8);
  text-shadow: 0 0 24px rgba(255, 255, 255, 0.1);
}

.prompt.show {
  animation: fadeInHoldOut 4.5s ease forwards;
}

@keyframes fadeInHoldOut {
  0%   { opacity: 0; transform: translateY(6px); }
  18%  { opacity: 1; transform: translateY(0); }
  80%  { opacity: 1; transform: translateY(0); }
  100% { opacity: 0; transform: translateY(-6px); }
}