/* GNB (Global Navigation Bar) Component */

.gnb {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  width: 100%;
  max-width: 100%;
  margin: 0 auto;
  height: var(--gnb-height);
  background-color: var(--color-bg-primary);
  box-shadow: 0 -1px 3px rgba(0, 0, 0, 0.05);
  display: flex;
  align-items: stretch;
  justify-content: space-around;
  z-index: var(--z-fixed);
  padding-bottom: env(safe-area-inset-bottom, 0);
}

@media (min-width: 500px) {
  .gnb {
    max-width: var(--max-width);
  }
}

.gnb-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: var(--space-2);
  color: var(--color-gray-500);
  font-size: var(--font-xs);
  font-weight: var(--font-medium);
  transition: all var(--transition-fast);
  position: relative;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.gnb-item:active {
  background-color: var(--color-gray-50);
}

.gnb-item.active,
.gnb-item:hover:not(.gnb-item--disabled) {
  color: var(--color-primary);
}

.gnb-item--disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.gnb-icon {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.gnb-item span:not(.gnb-badge) {
  font-size: var(--font-xs);
  line-height: 1;
}

.gnb-badge {
  position: absolute;
  top: var(--space-1);
  right: var(--space-2);
  background-color: var(--color-error);
  color: var(--color-text-inverse);
  font-size: 10px;
  font-weight: var(--font-bold);
  padding: 2px 6px;
  border-radius: var(--radius-full);
  min-width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

/* Responsive Adjustments */
@media (min-width: 500px) {
  .gnb {
    box-shadow: -1px 0 0 var(--color-border-light), 1px 0 0 var(--color-border-light), 0 -1px 3px rgba(0, 0, 0, 0.05);
  }
}