/**
 * Navigation Component Styles
 * Enhanced navigation with language flags, theme switcher, and avatar menu
 * Mobile-first responsive design
 */

/* ============================================================================
   BASE NAVIGATION STYLES
   ============================================================================ */

.nav {
  background-color: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border-default);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
  padding: 0 var(--spacing-4);
  max-width: var(--container-2xl);
  margin: 0 auto;
}

/* ============================================================================
   BRAND
   ============================================================================ */

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  font-size: var(--text-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.nav-brand:hover {
  opacity: 0.8;
}

.nav-brand-logo {
  height: 2rem;
  width: auto;
}

/* ============================================================================
   LANGUAGE SELECTOR - DESKTOP (FLAGS)
   ============================================================================ */

.language-selector-compact {
  display: flex !important;
  gap: var(--spacing-2);
  align-items: center;
}

.language-flag-btn {
  font-size: 24px;
  border: 2px solid transparent;
  padding: 4px;
  border-radius: var(--radius-default);
  cursor: pointer;
  background: transparent;
  transition: all 0.15s ease;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.language-flag-btn:hover {
  transform: scale(1.1);
  background: var(--color-bg-secondary);
}

.language-flag-btn.active {
  border-color: var(--color-primary-600);
  background: var(--color-primary-50);
}

.language-flag-btn:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

/* Mobile language selector (larger touch targets) */
.language-selector-mobile {
  display: flex;
  gap: var(--spacing-3);
  padding: var(--spacing-4);
  justify-content: center;
  border-top: 1px solid var(--color-border-default);
  border-bottom: 1px solid var(--color-border-default);
  margin-top: var(--spacing-2);
  margin-bottom: var(--spacing-2);
}

.language-flag-btn-mobile {
  font-size: 32px;
  border: 2px solid transparent;
  padding: 8px;
  border-radius: var(--radius-md);
  cursor: pointer;
  background: transparent;
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
  line-height: 1;
}

.language-flag-btn-mobile:hover {
  background: var(--color-bg-secondary);
}

.language-flag-btn-mobile.active {
  border-color: var(--color-primary-600);
  background: var(--color-primary-50);
}

/* ============================================================================
   THEME SWITCHER
   ============================================================================ */

.theme-switcher {
  display: flex !important;
  position: relative;
}

.theme-toggle-btn {
  padding: var(--spacing-2);
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-default);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  line-height: 1;
}

.theme-toggle-btn:hover {
  background: var(--color-bg-secondary);
  transform: scale(1.05);
}

.theme-toggle-btn:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

.theme-dropdown {
  min-width: 160px;
}

.theme-option {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  justify-content: space-between;
  padding: var(--spacing-3) var(--spacing-4);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  text-align: left;
  background: transparent;
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.theme-option:hover {
  background-color: var(--color-bg-secondary);
}

.theme-checkmark {
  color: var(--color-primary-600);
  font-weight: var(--font-weight-bold);
  font-size: 16px;
}

/* ============================================================================
   AVATAR DROPDOWN
   ============================================================================ */

.avatar-button {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-3);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.avatar-button:hover {
  background-color: var(--color-bg-secondary);
}

.avatar-button .avatar {
  /* Remove redundant properties already defined by .avatar-sm */
  border: 2px solid var(--color-border-default);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.05);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.avatar-button:hover .avatar {
  border-color: var(--color-border-hover);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.1);
}

/* Loading state for avatar */
.avatar-loading {
  background: linear-gradient(
    90deg,
    var(--color-bg-secondary) 0%,
    var(--color-bg-tertiary) 50%,
    var(--color-bg-secondary) 100%
  );
  background-size: 200% 100%;
  animation: avatarSkeleton 1.5s ease-in-out infinite;
}

@keyframes avatarSkeleton {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

.avatar-name {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Hide avatar name on smaller screens */
@media (max-width: 1024px) {
  .avatar-name {
    display: none;
  }
}

.avatar-dropdown {
  min-width: 240px;
  right: 0;
}

.dropdown-user-header {
  padding: var(--spacing-3) var(--spacing-4);
  border-bottom: 1px solid var(--color-border-default);
  background-color: var(--color-bg-secondary);
}

.dropdown-badge {
  margin-left: auto;
  background-color: var(--color-danger, #dc2626);
  color: white;
  font-size: 11px;
  font-weight: var(--font-weight-bold);
  padding: 2px 6px;
  border-radius: 10px;
  min-width: 18px;
  text-align: center;
}

/* ============================================================================
   DROPDOWN MENUS (GENERAL)
   ============================================================================ */

.dropdown-menu {
  position: absolute;
  top: calc(100% + var(--spacing-2));
  right: 0;
  min-width: 12rem;
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  z-index: var(--z-dropdown);
  animation: slideDown var(--transition-fast);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  width: 100%;
  padding: var(--spacing-3) var(--spacing-4);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  text-align: left;
  background: transparent;
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-fast);
  text-decoration: none;
}

.dropdown-item:hover {
  background-color: var(--color-bg-secondary);
  color: var(--color-text-primary);
}

.dropdown-item:focus-visible {
  background-color: var(--color-bg-secondary);
  outline: 2px solid var(--color-primary-500);
  outline-offset: -2px;
}

.dropdown-divider {
  height: 1px;
  background-color: var(--color-border-default);
  margin: var(--spacing-2) 0;
}

.dropdown-section-header {
  padding: var(--spacing-2) var(--spacing-4);
  font-size: var(--text-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Collapsible Section Headers */
.dropdown-section-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--spacing-2) var(--spacing-4);
  font-size: var(--text-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: transparent;
  border: none;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.dropdown-section-toggle:hover {
  background-color: var(--color-bg-secondary, #f8fafc);
}

.dropdown-section-toggle-icon {
  font-size: 0.75rem;
  transition: transform 0.2s ease;
}

.dropdown-section-toggle.collapsed .dropdown-section-toggle-icon {
  transform: rotate(-90deg);
}

.dropdown-section-content {
  max-height: 1000px;
  overflow: hidden;
  transition: max-height 0.3s ease-out, opacity 0.2s ease-out;
  opacity: 1;
}

.dropdown-section-content.collapsed {
  max-height: 0;
  opacity: 0;
}

/* ============================================================================
   NAV MENU (DESKTOP)
   ============================================================================ */

.nav-menu {
  display: flex;
  align-items: center;
}

/* ============================================================================
   NAV MENU LIST
   ============================================================================ */

.nav-menu-list {
  display: flex;
  align-items: center;
  gap: var(--spacing-6);
  list-style: none;
  margin: 0;
  padding: 0;
}

/* ============================================================================
   NOTIFICATION BELL CONTAINER
   ============================================================================ */

.notification-bell-container {
  position: relative;
  display: flex;
  align-items: center;
}

.notification-bell-btn {
  padding: var(--spacing-2);
  position: relative;
}

/* ============================================================================
   USER DROPDOWN ENHANCEMENTS
   ============================================================================ */

/* Override .dropdown inline-block from design-system.css to maintain flex layout */
.nav-menu-list > .user-dropdown {
  display: flex;
  align-items: center;
}

.user-dropdown {
  position: relative;
}

.user-header-name {
  font-weight: var(--font-weight-semibold);
  font-size: var(--text-base);
  color: var(--color-text-primary);
}

.user-header-email {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-top: 2px;
}

.dropdown-item-icon {
  font-size: 16px;
  width: 20px;
  text-align: center;
  flex-shrink: 0;
}

/* ============================================================================
   NAV DROPDOWN (FOR GROUPED LINKS)
   ============================================================================ */

.nav-dropdown {
  position: relative;
}

.nav-dropdown-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border: none;
  background: none;
  color: inherit;
  cursor: pointer;
  transition: background-color 0.2s;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
}

.nav-dropdown-toggle:hover {
  background-color: var(--color-bg-secondary);
}

.nav-dropdown-toggle:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 0.5rem;
  min-width: 200px;
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-dropdown);
  animation: slideDown var(--transition-fast);
}

.dropdown-align-right {
  left: auto;
  right: 0;
}

.dropdown-item-active {
  background-color: var(--color-primary-50);
  color: var(--color-primary-700);
  font-weight: var(--font-weight-medium);
}

[data-theme="dark"] .dropdown-item-active {
  background-color: var(--color-primary-900);
  color: var(--color-primary-300);
}

/* ============================================================================
   DROPDOWN SUBMENUS (FOR LANGUAGE & THEME)
   ============================================================================ */

.dropdown-submenu {
  position: relative;
}

.dropdown-submenu-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.dropdown-submenu-toggle .dropdown-chevron {
  margin-left: auto;
  flex-shrink: 0;
  transition: transform 0.2s;
}

.dropdown-submenu-toggle[aria-expanded="true"] .dropdown-chevron {
  transform: rotate(90deg);
}

.dropdown-submenu-content {
  position: static;
  margin-left: var(--spacing-4);
  margin-top: var(--spacing-1);
  padding-left: var(--spacing-4);
  border-left: 2px solid var(--color-border-default);
  animation: none;
}

/* Language and theme icons in submenus */
.language-flag-inline {
  font-size: 1.25rem;
  margin-right: 0.5rem;
}

.theme-icon-inline {
  font-size: 1.125rem;
  margin-right: 0.5rem;
}

/* ============================================================================
   MOBILE MENU
   ============================================================================ */

.nav-menu-mobile {
  display: none;
  flex-direction: column;
  gap: var(--spacing-2);
  padding: var(--spacing-4);
  border-top: 1px solid var(--color-border-default);
  background-color: var(--color-bg-primary);
}

.nav-menu-mobile .nav-link {
  width: 100%;
  text-align: left;
  padding: var(--spacing-3) var(--spacing-4);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.nav-menu-mobile .nav-link:hover {
  background-color: var(--color-bg-secondary);
}

/* ============================================================================
   NOTIFICATION BELL
   ============================================================================ */

.notification-badge {
  position: absolute;
  top: 4px;
  right: 4px;
  background-color: var(--color-danger, #dc2626);
  color: white;
  font-size: 10px;
  font-weight: var(--font-weight-bold);
  padding: 2px 5px;
  border-radius: 10px;
  min-width: 16px;
  text-align: center;
  display: none;
}

/* ============================================================================
   ANIMATIONS
   ============================================================================ */

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeOut {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

/* ============================================================================
   TOAST NOTIFICATIONS
   ============================================================================ */

.language-toast,
.language-toast-error {
  position: fixed;
  bottom: 20px;
  right: 20px;
  padding: var(--spacing-3) var(--spacing-4);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-tooltip);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  animation: slideInRight 0.3s ease-out;
}

.language-toast {
  background: var(--color-success-600);
  color: white;
}

.language-toast-error {
  background: var(--color-error-600);
  color: white;
}

/* ============================================================================
   RESPONSIVE BREAKPOINTS
   ============================================================================ */

/* Mobile (<768px) */
@media (max-width: 767px) {
  .hide-mobile {
    display: none !important;
  }

  .nav-container {
    padding: 0 var(--spacing-3);
  }

  /* Stack language flags on mobile menu */
  .language-selector-mobile {
    flex-wrap: wrap;
  }
}

/* Tablet and up (>=768px) */
@media (min-width: 768px) {
  .show-mobile {
    display: none !important;
  }

  .nav-container {
    padding: 0 var(--spacing-6);
  }

  /* Language selector visible on desktop */
  .language-selector-compact {
    display: flex !important;
  }
}

/* Desktop (>=1024px) */
@media (min-width: 1024px) {
  .nav-container {
    padding: 0 var(--spacing-8);
  }

  /* Show avatar name on larger screens */
  .avatar-name {
    display: block;
  }
}

/* ============================================================================
   DARK MODE OVERRIDES
   ============================================================================ */

[data-theme="dark"] .nav {
  background-color: var(--color-gray-900);
  border-bottom-color: var(--color-gray-700);
}

[data-theme="dark"] .dropdown-menu {
  background-color: var(--color-gray-800);
  border-color: var(--color-gray-700);
}

[data-theme="dark"] .dropdown-user-header {
  background-color: var(--color-gray-900);
  border-bottom-color: var(--color-gray-700);
}

[data-theme="dark"] .dropdown-item:hover {
  background-color: var(--color-gray-700);
}

[data-theme="dark"] .language-flag-btn.active {
  background: var(--color-primary-900);
  border-color: var(--color-primary-500);
}

[data-theme="dark"] .language-flag-btn-mobile.active {
  background: var(--color-primary-900);
  border-color: var(--color-primary-500);
}

[data-theme="dark"] .theme-toggle-btn:hover {
  background: var(--color-gray-700);
}

[data-theme="dark"] .avatar-button:hover {
  background: var(--color-gray-800);
}

/* ============================================================================
   ACCESSIBILITY IMPROVEMENTS
   ============================================================================ */

/* Ensure sufficient touch targets on mobile */
@media (max-width: 767px) {
  .btn-ghost {
    min-width: 44px;
    min-height: 44px;
  }
}

/* Keyboard focus states */
.nav-link:focus-visible,
.dropdown-item:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Reduced motion for animations */
@media (prefers-reduced-motion: reduce) {
  .dropdown-menu,
  .language-toast,
  .language-toast-error,
  .language-flag-btn,
  .language-flag-btn-mobile,
  .theme-toggle-btn,
  .avatar-button {
    animation: none !important;
    transition: none !important;
  }
}

/* High contrast mode improvements */
@media (prefers-contrast: high) {
  .nav {
    border-bottom-width: 2px;
  }

  .dropdown-menu {
    border-width: 2px;
  }

  .language-flag-btn.active,
  .language-flag-btn-mobile.active {
    border-width: 3px;
  }
}