/* Background Selector Toggle */
.bg-selector-toggle {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(20, 20, 30, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--secondary-color);
  cursor: pointer;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

.bg-selector-toggle:hover,
.bg-selector-toggle.active {
  background: rgba(74, 137, 220, 0.25);
  border-color: var(--accent-color);
  color: var(--primary-color);
  transform: scale(1.05);
}

/* Background Selector Panel */
.bg-selector-panel {
  position: fixed;
  bottom: 4.5rem;
  right: 1.5rem;
  width: 300px;
  background: rgba(15, 15, 25, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-lg);
  padding: 1rem;
  z-index: 1000;
  backdrop-filter: blur(20px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  opacity: 0;
  transform: translateY(10px) scale(0.95);
  pointer-events: none;
  transition: all 0.25s ease;
}

.bg-selector-panel.open {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.bg-selector-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--secondary-color);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

/* Thumbnail Grid */
.bg-selector-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
}

.bg-option {
  background: none;
  border: 2px solid transparent;
  border-radius: var(--border-radius-md);
  padding: 0;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.bg-option:hover {
  border-color: rgba(255, 255, 255, 0.2);
}

.bg-option.active {
  border-color: var(--accent-color);
}

.bg-option.active .bg-thumb {
  box-shadow: 0 0 8px rgba(74, 137, 220, 0.4);
}

.bg-thumb {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 6px;
  background-size: cover;
  background-position: center;
  transition: all 0.2s ease;
}

.bg-option:hover .bg-thumb {
  transform: scale(1.05);
}

.bg-name {
  font-size: 0.6rem;
  color: var(--secondary-color);
  text-align: center;
  line-height: 1;
}

.bg-option.active .bg-name {
  color: var(--accent-color);
}

/* Mobile */
@media (max-width: 768px) {
  .bg-selector-panel {
    right: 0.75rem;
    bottom: 4rem;
    width: 250px;
  }

  .bg-selector-toggle {
    bottom: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
  }

  .bg-selector-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 0.4rem;
  }
}