/**
 * Navigation CSS - Bottom nav (mobile) and sidebar (desktop)
 * Mobile-first with touch-friendly targets
 */

/* ==================== APP HEADER ==================== */

.app-header {
  position: sticky;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 var(--content-padding);
  background-color: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  z-index: var(--z-sticky);
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.header-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin: 0;
}

.header-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-muted);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Menu toggle button (mobile) */
.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--color-text);
  font-size: 20px;
  transition: background-color var(--transition-fast);
}

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

/* Hide menu toggle on desktop - sidebar is always visible */
@media (min-width: 768px) {
  .menu-toggle {
    display: none;
  }
}

/* Status indicator in header */
.header-status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-full);
}

.header-status-dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-success);
  border-radius: 50%;
}

.header-status-dot.offline {
  background-color: var(--color-danger);
}

/* ==================== BOTTOM NAVIGATION (MOBILE) ==================== */

.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: stretch;
  height: var(--nav-height);
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
  z-index: var(--z-fixed);
  
  /* Safe area for iOS devices with home indicator */
  padding-bottom: env(safe-area-inset-bottom);
}

.nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  min-height: var(--touch-target-min);
  padding: var(--space-2);
  color: var(--color-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
}

.nav-item:hover {
  color: var(--color-text);
}

.nav-item.active {
  color: var(--color-primary);
}

.nav-item-icon {
  font-size: 22px;
  line-height: 1;
}

.nav-item-label {
  font-size: var(--font-size-xs);
  font-weight: 500;
}

/* Active indicator */
.nav-item.active::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 48px;
  height: 3px;
  background-color: var(--color-primary);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

/* Hide bottom nav on tablet+ */
@media (min-width: 768px) {
  .bottom-nav {
    display: none;
  }
}

/* ==================== SIDEBAR NAVIGATION (DESKTOP) ==================== */

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  display: none;
  flex-direction: column;
  background-color: var(--color-card);
  border-right: 1px solid var(--color-border);
  z-index: var(--z-fixed);
  overflow-y: auto;
}

/* Show sidebar on tablet+ */
@media (min-width: 768px) {
  .sidebar {
    display: flex;
  }
}

.sidebar-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.sidebar-logo {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary);
  color: white;
  font-size: 18px;
  border-radius: var(--radius-sm);
}

.sidebar-brand {
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.sidebar-nav {
  flex: 1;
  padding: var(--space-3);
}

.sidebar-section {
  margin-bottom: var(--space-4);
}

.sidebar-section-title {
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.sidebar-link:hover {
  background-color: var(--color-bg-secondary);
  color: var(--color-text);
}

.sidebar-link.active {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 500;
}

.sidebar-link-icon {
  font-size: 18px;
  width: 24px;
  text-align: center;
}

.sidebar-link-badge {
  margin-left: auto;
  padding: 2px 6px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  background-color: var(--color-danger);
  color: white;
  border-radius: var(--radius-full);
}

/* Nested navigation items */
.sidebar-nested {
  margin-left: calc(24px + var(--space-3));
  padding-left: var(--space-3);
  border-left: 1px solid var(--color-border);
}

.sidebar-nested .sidebar-link {
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-xs);
}

.sidebar-footer {
  padding: var(--space-4);
  border-top: 1px solid var(--color-border);
}

/* ==================== MOBILE SLIDE-OUT MENU ==================== */

.mobile-menu-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: var(--z-modal-backdrop);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.mobile-menu-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: min(280px, 85vw);
  background-color: var(--color-card);
  z-index: var(--z-modal);
  transform: translateX(-100%);
  transition: transform var(--transition-normal);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.mobile-menu.active {
  transform: translateX(0);
}

.mobile-menu-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.mobile-menu-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 24px;
  color: var(--color-muted);
}

.mobile-menu-nav {
  flex: 1;
  padding: var(--space-3);
}

.mobile-menu-link {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  font-size: var(--font-size-base);
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

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

.mobile-menu-link.active {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 500;
}

.mobile-menu-link-icon {
  font-size: 20px;
  width: 28px;
  text-align: center;
}

.mobile-menu-divider {
  height: 1px;
  background-color: var(--color-border);
  margin: var(--space-3) 0;
}

.mobile-menu-footer {
  padding: var(--space-4);
  border-top: 1px solid var(--color-border);
}

/* Hide mobile menu on desktop */
@media (min-width: 768px) {
  .mobile-menu-backdrop,
  .mobile-menu {
    display: none;
  }
}

/* ==================== BREADCRUMBS ==================== */

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-muted);
  margin-bottom: var(--space-4);
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

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

.breadcrumb-item a:hover {
  color: var(--color-primary);
}

.breadcrumb-item:last-child {
  color: var(--color-text);
  font-weight: 500;
}

.breadcrumb-separator {
  color: var(--color-border);
}

/* ==================== PAGE TITLE SECTION ==================== */

.page-header {
  margin-bottom: var(--space-6);
}

.page-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin: 0 0 var(--space-2);
}

.page-description {
  color: var(--color-text-secondary);
  margin: 0;
}

/* Title with actions */
.page-header-flex {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

@media (min-width: 768px) {
  .page-header-flex {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.page-actions {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

/* ==================== TAB NAVIGATION ==================== */

.tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-4);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.tab {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  margin-bottom: -1px;
}

.tab:hover {
  color: var(--color-text);
}

.tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.tab-badge {
  padding: 2px 6px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  background-color: var(--color-bg-secondary);
  color: var(--color-muted);
  border-radius: var(--radius-full);
}

.tab.active .tab-badge {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

/* ==================== QUICK ACTION FAB ==================== */

.fab {
  position: fixed;
  bottom: calc(var(--nav-height) + var(--space-4));
  right: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background-color: var(--color-primary);
  color: white;
  border: none;
  border-radius: 50%;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  z-index: var(--z-sticky);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.fab:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 20px rgba(0, 120, 212, 0.4);
}

.fab:active {
  transform: scale(0.95);
}

.fab-icon {
  font-size: 24px;
}

/* Desktop: position FAB differently when sidebar present */
@media (min-width: 768px) {
  .fab {
    bottom: var(--space-6);
    right: var(--space-6);
  }
}

/* ==================== OFFLINE BANNER ==================== */

.offline-banner {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background-color: var(--color-warning-bg);
  color: var(--color-warning);
  font-size: var(--font-size-sm);
  font-weight: 500;
  z-index: var(--z-sticky);
  transform: translateY(-100%);
  transition: transform var(--transition-normal);
}

.offline-banner.visible {
  transform: translateY(0);
}

@media (min-width: 768px) {
  .offline-banner {
    left: var(--sidebar-width);
  }
}