.battle-arena {
  position: fixed;
  inset: 0;
  z-index: 20;
  overflow: hidden;
  pointer-events: none;
  display: none;
}

.battle-arena.is-active {
  display: block;
}

.war-mode-toggle {
  position: relative;
  width: 2rem;
  height: 1.1rem;
  border-radius: 9999px;
  border: 1px solid hsl(var(--border));
  background: hsl(var(--secondary));
  transition: background 0.2s ease;
  flex-shrink: 0;
}

.war-mode-toggle::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 9999px;
  background: hsl(var(--foreground));
  transition: transform 0.2s ease;
}

.war-mode-toggle.is-on {
  background: hsl(270 55% 35%);
  border-color: hsl(280 60% 55% / 0.5);
}

.war-mode-toggle.is-on::after {
  transform: translateX(0.85rem);
  background: hsl(48 95% 62%);
}

.disco-mode-toggle {
  position: relative;
  width: 2rem;
  height: 1.1rem;
  border-radius: 9999px;
  border: 1px solid hsl(var(--border));
  background: hsl(var(--secondary));
  transition: background 0.2s ease;
  flex-shrink: 0;
}

.disco-mode-toggle::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 9999px;
  background: hsl(var(--foreground));
  transition: transform 0.2s ease;
}

.disco-mode-toggle.is-on {
  background: linear-gradient(90deg, hsl(330 85% 55%), hsl(55 95% 55%), hsl(190 90% 55%), hsl(270 85% 60%));
  background-size: 200% 100%;
  animation: disco-toggle-bg 1.5s linear infinite;
  border-color: hsl(0 0% 100% / 0.35);
}

.disco-mode-toggle.is-on::after {
  transform: translateX(0.85rem);
  background: hsl(0 0% 100%);
  box-shadow: 0 0 8px hsl(0 0% 100% / 0.8);
}

@keyframes disco-toggle-bg {
  to { background-position: 200% 0; }
}