/* ==========================================================================
   Sphere stage — sections 4–8
   ========================================================================== */

.beta-sphere-stage {
  position: relative;
  height: 100vh;
  height: 100svh;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.beta-sphere-perspective {
  perspective: 1200px;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.beta-sphere {
  position: relative;
  transform-style: preserve-3d;
  width: 1px;
  height: 1px;
}

.beta-sphere-word {
  position: absolute;
  top: 0;
  left: 0;
  transform-style: preserve-3d;
  white-space: nowrap;
  font-family: var(--beta-font-display);
  font-weight: 700;
  font-size: clamp(13px, 1.6vw, 20px);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--beta-fg);
  opacity: 0.85;
  cursor: pointer;
  transition: opacity 220ms var(--beta-ease), color 150ms var(--beta-ease);
  background: none;
  border: none;
  padding: 0;
}

.beta-sphere-word.beta-is-secondary {
  font-size: clamp(10px, 1.05vw, 13px);
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--beta-fg-muted);
}

.beta-sphere.beta-has-hover .beta-sphere-word {
  opacity: 0.14;
}

.beta-sphere.beta-has-hover .beta-sphere-word.beta-is-hovered {
  opacity: 1;
  color: var(--beta-accent);
}

.beta-sphere-meta {
  position: absolute;
  left: var(--beta-edge);
  bottom: 96px;
  z-index: 10;
  font-family: var(--beta-font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--beta-fg-muted);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 200ms var(--beta-ease), transform 200ms var(--beta-ease);
  max-width: 60vw;
}

.beta-sphere-meta.beta-is-visible {
  opacity: 1;
  transform: translateY(0);
}

.beta-sphere-meta strong {
  display: block;
  color: var(--beta-fg);
  font-size: 12px;
}

.beta-scroll-cue {
  position: absolute;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  font-family: var(--beta-font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--beta-fg-faint);
  animation: beta-scroll-cue-bob 1.8s var(--beta-ease) infinite;
}

@keyframes beta-scroll-cue-bob {
  0%, 100% { transform: translate(-50%, 0); opacity: 0.6; }
  50% { transform: translate(-50%, 6px); opacity: 1; }
}

.beta-sphere-stage.beta-scrolled-past .beta-scroll-cue {
  display: none;
}

/* Mobile / reduced-motion fallback — plain stacked list built by
   sphere.js into the same #betaSphere element (see section 19). */
.beta-sphere.beta-is-flat {
  width: auto;
  height: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  transform: none !important;
}

.beta-sphere.beta-is-flat .beta-sphere-word {
  position: static;
  transform: none !important;
  opacity: 1;
}

.beta-sphere.beta-is-flat.beta-has-hover .beta-sphere-word {
  opacity: 0.35;
}

.beta-sphere.beta-is-flat.beta-has-hover .beta-sphere-word.beta-is-hovered {
  opacity: 1;
}