body.intro {
  background: var(--onyx);
  color: var(--paper);
  overflow-x: hidden;
}
body.intro main {
  padding-top: 0;
}

.intro-stage canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  background: var(--onyx);
}

.intro-track {
  height: 640vh;
}

.intro-copy {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.hero-controls {
  position: fixed;
  right: var(--gutter);
  bottom: var(--space-3);
  z-index: 60;
  transition: opacity 0.25s var(--ease), visibility 0.25s var(--ease);
}
.hero-controls.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
.hero-controls .btn {
  background: color-mix(in srgb, var(--onyx) 45%, transparent);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  font-size: 0.8rem;
}

.intro-veil {
  position: fixed;
  inset: 0;
  z-index: 80;
  background: var(--onyx);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s var(--ease);
}
.intro-done .intro-veil {
  opacity: 1;
  pointer-events: auto;
}
.intro-noscript {
  position: fixed;
  inset: auto 0 var(--space-4);
  text-align: center;
  font-weight: 500;
}