/* =============================================================
   Background animation playback controls
   Fixed bottom-right corner, fades to near-invisible when idle.
   flex-direction: column-reverse places the primary action
   (play/pause) at the bottom — first in source/tab order.
   ============================================================= */

#bg-controls {
  position: fixed;
  inset-block-end: 1rem;
  inset-inline-end: 1rem;
  z-index: 10;

  display: flex;
  flex-direction: column-reverse;
  align-items: center;
  gap: 5px;

  opacity: 0.18;
  transition: opacity 0.35s ease;
}

#bg-controls:hover,
#bg-controls:focus-within {
  opacity: 0.85;
}

/* ── Button base ── */

.bgc-btn {
  width: 28px;
  height: 28px;
  padding: 0;
  border: none;
  border-radius: 6px;
  background: rgba(8, 18, 32, 0.5);
  color: rgba(220, 238, 255, 0.92);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: background 0.15s ease;
}

.bgc-btn:hover {
  background: rgba(8, 18, 32, 0.75);
}

.bgc-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

/* ── Tooltips ── */

.bgc-btn::after {
  content: attr(data-tooltip);
  position: absolute;
  right: calc(100% + 8px);
  top: 50%;
  transform: translateY(-50%);
  background: rgba(8, 18, 32, 0.88);
  color: rgba(220, 238, 255, 0.95);
  font-size: 11px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  white-space: nowrap;
  padding: 3px 8px;
  border-radius: 4px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.18s ease;
  transition-delay: 0.45s;
}

.bgc-btn:hover::after {
  opacity: 1;
}

/* ── Reduced motion: remove transitions ── */

@media (prefers-reduced-motion: reduce) {
  #bg-controls {
    transition: none;
  }
  .bgc-btn {
    transition: none;
  }
  .bgc-btn::after {
    transition: none;
    transition-delay: 0s;
  }
}