/* ============================================
   LINUS — Bottom Navigation Bar
   Fixed bottom, 6 items, center Linus accent
   ============================================ */

.nav-bar {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: var(--container-max);
  height: calc(var(--nav-height) + var(--safe-bottom));
  padding-bottom: var(--safe-bottom);
  background: var(--bg-card);
  border-top: 1px solid var(--color-border-light);
  box-shadow: 0 -2px 16px rgba(45, 49, 66, 0.06);
  display: flex;
  align-items: stretch;
  justify-content: space-around;
  z-index: var(--z-nav);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

/* =============================================
   NAV ITEMS
   ============================================= */
.nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  min-width: var(--touch-target);
  min-height: var(--touch-target);
  padding: var(--space-sm) 0;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  position: relative;
  -webkit-tap-highlight-color: transparent;
  transition:
    color var(--transition-normal),
    transform var(--transition-fast);
}

.nav-item:active {
  transform: scale(0.90);
}

/* Icon */
.nav-item__icon {
  font-size: 22px;
  line-height: 1;
  transition:
    color var(--transition-normal),
    transform var(--transition-spring);
}

/* Label */
.nav-item__label {
  font-size: 10px;
  font-weight: var(--weight-medium);
  letter-spacing: 0.02em;
  line-height: 1;
  transition: color var(--transition-normal);
}

/* Active state */
.nav-item.active {
  color: var(--color-linus-1);
}

.nav-item.active .nav-item__icon {
  transform: scale(1.12) translateY(-1px);
  color: var(--color-linus-1);
}

.nav-item.active .nav-item__label {
  font-weight: var(--weight-semibold);
  color: var(--color-linus-1);
}

/* Active indicator dot */
.nav-item::after {
  content: '';
  position: absolute;
  top: 6px;
  width: 4px;
  height: 4px;
  border-radius: var(--radius-full);
  background: var(--color-linus-1);
  opacity: 0;
  transform: scale(0);
  transition:
    opacity var(--transition-normal),
    transform var(--transition-spring);
}

.nav-item.active::after {
  opacity: 1;
  transform: scale(1);
}

/* =============================================
   CENTER LINUS BUTTON (special)
   ============================================= */
.nav-item--linus {
  position: relative;
}

.nav-item--linus .nav-item__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: linear-gradient(
    135deg,
    var(--color-linus-1) 0%,
    var(--color-linus-2) 50%,
    var(--color-linus-3) 100%
  );
  background-size: 200% 200%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-inverse);
  font-size: 18px;
  box-shadow: 0 2px 12px rgba(184, 169, 201, 0.35);
  margin-top: -8px;
  transition:
    transform var(--transition-spring),
    box-shadow var(--transition-normal);
  animation: navLinusGradient 5s ease infinite;
}

.nav-item--linus:active .nav-item__icon {
  transform: scale(0.88);
}

.nav-item--linus.active .nav-item__icon {
  transform: scale(1.1) translateY(-2px);
  box-shadow: 0 4px 20px rgba(184, 169, 201, 0.5);
}

/* Override normal active dot for linus */
.nav-item--linus::after {
  display: none;
}

.nav-item--linus .nav-item__label {
  margin-top: 1px;
}

.nav-item--linus.active .nav-item__label {
  color: var(--color-linus-1);
}

/* =============================================
   NOTIFICATION BADGE ON NAV
   ============================================= */
.nav-item__badge {
  position: absolute;
  top: 6px;
  right: calc(50% - 18px);
  min-width: 16px;
  height: 16px;
  padding: 0 4px;
  border-radius: var(--radius-full);
  background: var(--color-danger);
  color: var(--color-text-inverse);
  font-size: 9px;
  font-weight: var(--weight-bold);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--bg-card);
  line-height: 1;
  animation: navBadgePop 300ms var(--transition-spring);
}

/* =============================================
   KEYFRAMES
   ============================================= */
@keyframes navLinusGradient {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

@keyframes navBadgePop {
  0% { transform: scale(0); }
  60% { transform: scale(1.2); }
  100% { transform: scale(1); }
}