#bottom-controls {
  position: fixed;
  bottom: 20px;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 0 120px;
  z-index: 20;
}

.bottom-ctrl {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: #f5f5f5;
  font-size: 112px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: none;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.8);
  cursor: pointer;
  padding: 0;
  box-sizing: border-box;
  transition: opacity 0.4s ease-out;
  opacity: 0.2;
  will-change: opacity;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.bottom-ctrl.faded {
  opacity: 0.05;
  transition: opacity 3s ease-in-out;
}

.bottom-ctrl.disabled {
  opacity: 0.25;
  filter: grayscale(1);
  pointer-events: none;
  cursor: default;
}

.bottom-ctrl:hover {
  opacity: 1 !important;
}

.bottom-ctrl:active {
  transform: scale(0.96) !important;
  animation: none !important;
}

.bottom-ctrl.active {
  background: transparent;
  color: #f5f5f5;
  box-shadow: none;
  text-shadow:
    0 0 10px rgba(245, 245, 245, 0.6),
    0 0 20px rgba(212, 175, 55, 0.7),
    0 0 30px rgba(212, 175, 55, 0.5);
}

#fullscreen-toggle.active {
  box-shadow: none;
}

@keyframes iconFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-3px); }
}

.bottom-ctrl.floating {
  animation: iconFloat 4s ease-in-out infinite;
}

#slideshow-toggle {
  overflow: hidden;
}

#fullscreen-toggle {
  width: 200px;
  height: 200px;
  font-size: 124px;
  font-weight: 700;
  letter-spacing: 1px;
  border: none;
}