/**
 * SBS Deutschland – App Shell Navigation
 * =======================================
 * Enterprise-grade Navigation für eingeloggte User.
 * Dual-Layer: Global Header + App Navigation Bar
 * 
 * Voraussetzung: design-tokens.css muss vorher geladen sein.
 */

/* ============================================================
   APP SHELL CONTAINER
   ============================================================ */

.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-shell-content {
  flex: 1;
  background: var(--color-bg-secondary);
}

/* ============================================================
   GLOBAL HEADER (Layer 1) - Kompakt, immer sichtbar
   ============================================================ */

.app-global-header {
  height: 52px;
  background: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-6);
  position: sticky;
  top: 0;
  z-index: var(--z-fixed);
}

.app-global-header-left {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

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

/* App Switcher Button */
.app-switcher-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.app-switcher-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

.app-switcher-btn svg {
  width: 20px;
  height: 20px;
  fill: var(--color-text-inverse);
}

/* Current App Indicator */
.app-current {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text-inverse);
  font-weight: var(--font-semibold);
  font-size: var(--text-sm);
}

.app-current-icon {
  width: 28px;
  height: 28px;
  background: var(--color-accent);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

.app-current-name {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.app-current-name small {
  font-size: var(--text-xs);
  opacity: 0.7;
  font-weight: var(--font-normal);
}

/* Global Header Actions */
.app-header-action {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-lg);
  color: var(--color-text-inverse);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.app-header-action:hover {
  background: rgba(255, 255, 255, 0.1);
}

.app-header-action svg {
  width: 20px;
  height: 20px;
}

.app-header-action .badge {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 8px;
  height: 8px;
  background: var(--color-error);
  border-radius: 50%;
}

/* User Menu Button */
.app-user-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-2) var(--space-1) var(--space-1);
  background: rgba(255, 255, 255, 0.1);
  border: none;
  border-radius: var(--radius-full);
  color: var(--color-text-inverse);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.app-user-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

.app-user-avatar {
  width: 28px;
  height: 28px;
  background: var(--color-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xs);
  font-weight: var(--font-bold);
  color: var(--color-primary);
}

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

/* ============================================================
   APP SWITCHER PANEL
   ============================================================ */

.app-switcher-panel {
  position: fixed;
  top: 52px;
  left: 0;
  width: 320px;
  background: var(--color-bg);
  border-radius: 0 0 var(--radius-xl) 0;
  box-shadow: var(--shadow-2xl);
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-normal);
}

.app-switcher-panel.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.app-switcher-header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.app-switcher-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
}

.app-switcher-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4);
  background: var(--color-bg-secondary);
  border: 2px solid transparent;
  border-radius: var(--radius-xl);
  text-decoration: none;
  color: var(--color-text);
  transition: all var(--transition-fast);
}

.app-switcher-item:hover {
  background: var(--color-bg-tertiary);
  border-color: var(--color-border);
}

.app-switcher-item.active {
  background: var(--color-primary-50);
  border-color: var(--color-primary);
}

.app-switcher-item-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

.app-switcher-item-icon.invoice {
  background: linear-gradient(135deg, #22d3ee, #06b6d4);
}

.app-switcher-item-icon.contract {
  background: linear-gradient(135deg, #8b5cf6, #a78bfa);
}

.app-switcher-item-name {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
}

.app-switcher-item-badge {
  font-size: var(--text-xs);
  padding: 2px 8px;
  background: var(--color-success-light);
  color: var(--color-success-dark);
  border-radius: var(--radius-full);
}

.app-switcher-divider {
  height: 1px;
  background: var(--color-border);
  margin: 0 var(--space-5);
}

.app-switcher-links {
  padding: var(--space-3) var(--space-5) var(--space-5);
}

.app-switcher-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--text-sm);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

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

.app-switcher-link svg {
  width: 18px;
  height: 18px;
  opacity: 0.7;
}

/* ============================================================
   APP NAVIGATION BAR (Layer 2)
   ============================================================ */

.app-nav-bar {
  height: 48px;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  padding: 0 var(--space-6);
  position: sticky;
  top: 52px;
  z-index: calc(var(--z-fixed) - 1);
}

.app-nav-tabs {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  height: 100%;
}

.app-nav-tab {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  height: 100%;
  padding: 0 var(--space-4);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
}

.app-nav-tab:hover {
  color: var(--color-text);
  background: var(--color-bg-secondary);
}

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

.app-nav-tab svg {
  width: 18px;
  height: 18px;
}

.app-nav-tab .badge {
  font-size: 10px;
  padding: 2px 6px;
  background: var(--color-error);
  color: white;
  border-radius: var(--radius-full);
  font-weight: var(--font-bold);
}

/* App Nav Dropdown */
.app-nav-dropdown {
  position: relative;
  height: 100%;
}

.app-nav-dropdown-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  height: 100%;
  padding: 0 var(--space-4);
  color: var(--color-text-secondary);
  background: none;
  border: none;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
}

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

.app-nav-dropdown-btn svg {
  width: 18px;
  height: 18px;
}

.app-nav-dropdown-btn .chevron {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-fast);
}

.app-nav-dropdown.open .chevron {
  transform: rotate(180deg);
}

.app-nav-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: all var(--transition-fast);
  z-index: var(--z-dropdown);
}

.app-nav-dropdown.open .app-nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.app-nav-dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  color: var(--color-text);
  text-decoration: none;
  font-size: var(--text-sm);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

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

.app-nav-dropdown-item svg {
  width: 18px;
  height: 18px;
  color: var(--color-text-secondary);
}

.app-nav-dropdown-item .external-badge {
  margin-left: auto;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

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

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

/* ============================================================
   USER DROPDOWN MENU
   ============================================================ */

.app-user-menu {
  position: fixed;
  top: 52px;
  right: var(--space-4);
  width: 280px;
  background: var(--color-bg);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-2xl);
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-normal);
}

.app-user-menu.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.app-user-menu-header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.app-user-menu-name {
  font-weight: var(--font-semibold);
  color: var(--color-text);
  margin-bottom: 2px;
}

.app-user-menu-email {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.app-user-menu-plan {
  display: inline-block;
  margin-top: var(--space-2);
  padding: 2px 8px;
  background: var(--color-primary-50);
  color: var(--color-primary);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  border-radius: var(--radius-full);
}

.app-user-menu-links {
  padding: var(--space-2);
}

.app-user-menu-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  color: var(--color-text);
  text-decoration: none;
  font-size: var(--text-sm);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

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

.app-user-menu-link svg {
  width: 18px;
  height: 18px;
  color: var(--color-text-secondary);
}

.app-user-menu-link.danger {
  color: var(--color-error);
}

.app-user-menu-link.danger svg {
  color: var(--color-error);
}

.app-user-menu-divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-2);
}

/* ============================================================
   APP FOOTER
   ============================================================ */

.app-footer {
  background: var(--color-gray-900);
  color: var(--color-text-inverse);
  padding: var(--space-16) var(--space-6) var(--space-8);
}

.app-footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--space-12);
  max-width: var(--container-xl);
  margin: 0 auto;
}

.app-footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.app-footer-brand img {
  height: 40px;
  width: auto;
}

.app-footer-brand-text {
  display: flex;
  flex-direction: column;
}

.app-footer-brand-text strong {
  font-size: var(--text-base);
}

.app-footer-brand-text span {
  font-size: var(--text-xs);
  opacity: 0.7;
}

.app-footer-tagline {
  font-size: var(--text-sm);
  color: var(--color-gray-400);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-4);
}

.app-footer-location {
  font-size: var(--text-sm);
  color: var(--color-gray-400);
}

.app-footer h4 {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-gray-300);
  margin-bottom: var(--space-4);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.app-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.app-footer li {
  margin-bottom: var(--space-3);
}

.app-footer a {
  font-size: var(--text-sm);
  color: var(--color-gray-400);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.app-footer a:hover {
  color: var(--color-text-inverse);
}

.app-footer-bottom {
  max-width: var(--container-xl);
  margin: var(--space-12) auto 0;
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-gray-800);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-sm);
  color: var(--color-gray-500);
}

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

@media (max-width: 1024px) {
  .app-footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-8);
  }
}

@media (max-width: 768px) {
  .app-global-header {
    padding: 0 var(--space-4);
  }
  
  .app-user-name {
    display: none;
  }
  
  .app-nav-bar {
    padding: 0 var(--space-4);
    overflow-x: auto;
  }
  
  .app-nav-tabs {
    min-width: max-content;
  }
  
  .app-footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
  
  .app-footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }
}

/* ============================================================
   OVERLAY (für Modal-Schließung)
   ============================================================ */

.app-overlay {
  position: fixed;
  inset: 0;
  background: transparent;
  z-index: calc(var(--z-modal) - 1);
  display: none;
}

.app-overlay.active {
  display: block;
}