/* ========================================
   NAVIGATION COMPONENT
   ======================================== */

/* ===== NAVBAR ===== */
.navbar {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-outline);
  padding: var(--space-lg) 0;
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.navbar-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

/* ===== NAVBAR BRAND ===== */
.navbar-brand {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-md);
  transition: transform var(--transition-fast);
  white-space: nowrap;
}

.navbar-brand:hover {
  transform: scale(1.05);
}

.navbar-brand .icon {
  width: 1.5rem;
  height: 1.5rem;
}

/* ===== NAVBAR ACTIONS ===== */
.navbar-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* ===== THEME TOGGLE BUTTON ===== */
.theme-toggle {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-surface-variant);
  border: 1px solid var(--color-outline);
  color: var(--color-on-surface);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  padding: 0;
  font-size: 1.25rem;
  line-height: 1;
}

.theme-toggle:hover {
  background: var(--color-primary);
  color: white;
  transform: rotate(20deg);
}

.theme-toggle:focus {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-primary-lighter);
}

.theme-toggle .icon {
  width: 1.25rem;
  height: 1.25rem;
}

/* ===== CART BUTTON ===== */
.cart-button {
  position: relative;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-primary);
  border: none;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 1.25rem;
  padding: 0;
}

.cart-button:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.cart-button:focus {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-primary-lighter);
}

.cart-button .icon {
  width: 1.25rem;
  height: 1.25rem;
}

/* ===== CART BADGE ===== */
.cart-badge {
  position: absolute;
  top: -8px;
  right: -8px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-error);
  color: white;
  font-size: var(--text-xs);
  font-weight: var(--font-weight-bold);
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
}

/* ===== BREADCRUMB ===== */
.breadcrumb {
  display: flex;
  gap: var(--space-md);
  margin: var(--space-3xl) 0 var(--space-2xl);
  font-size: var(--text-sm);
  flex-wrap: wrap;
  align-items: center;
}

.breadcrumb-item {
  color: var(--color-on-surface-variant);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.breadcrumb-item a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumb-item a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

.breadcrumb-item.active {
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

.breadcrumb-separator {
  color: var(--color-outline);
  user-select: none;
}

/* ===== BACK BUTTON ===== */
.back-button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-primary);
  text-decoration: none;
  font-weight: var(--font-weight-semibold);
  transition: all var(--transition-fast);
  padding: var(--space-sm) var(--space-md);
  margin: var(--space-2xl) 0;
  border-radius: var(--radius-md);
}

.back-button:hover {
  gap: var(--space-md);
  background: var(--color-primary-lighter);
}

.back-button:focus {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-primary-lighter);
}

.back-button .icon {
  width: 1.25rem;
  height: 1.25rem;
  transition: transform var(--transition-fast);
}

.back-button:hover .icon {
  transform: translateX(-3px);
}

/* ===== RESPONSIVE NAVBAR ===== */
@media (max-width: 480px) {
  .navbar {
    padding: var(--space-md) 0;
  }

  .navbar-container {
    padding: 0 var(--space-md);
    gap: var(--space-sm);
  }

  .navbar-brand {
    font-size: var(--text-lg);
  }

  .theme-toggle,
  .cart-button {
    width: 40px;
    height: 40px;
  }
}

/* ===== HEADER SECTION ===== */
.page-header {
  margin-bottom: var(--space-3xl);
}

.page-header-title {
  font-size: var(--text-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-on-surface);
  margin: var(--space-xl) 0 var(--space-md);
}

.page-header-subtitle {
  font-size: var(--text-base);
  color: var(--color-on-surface-variant);
  line-height: var(--line-height-relaxed);
}

/* ===== HEADER WITH ACTIONS ===== */
.header-with-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-3xl);
  flex-wrap: wrap;
  gap: var(--space-lg);
}

.header-content h1 {
  font-size: var(--text-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-on-surface);
  margin: 0;
}

.header-actions {
  display: flex;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .header-with-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .header-actions {
    width: 100%;
  }

  .header-actions .btn {
    flex: 1;
    min-width: 120px;
  }
}