#app {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

/* Header */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(135deg, #1B4FD8 0%, #0F2E7A 100%);
  border-bottom: none;
  padding: var(--space-3) var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.app-header__logo {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: -0.02em;
}

.app-header__logo span {
  color: #FFB830;
}

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

.app-header__avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  border: 2px solid rgba(255, 255, 255, 0.3);
  cursor: pointer;
}

.app-header__signout {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.app-header__signout:hover {
  color: #FFFFFF;
  background: rgba(255, 255, 255, 0.1);
}

/* Main content */
.app-main {
  flex: 1;
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-4);
  padding-bottom: calc(var(--space-16) + var(--space-8));
}

/* Bottom navigation (mobile) */
.app-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border-light);
  display: flex;
  justify-content: space-around;
  padding: var(--space-2) 0;
  padding-bottom: max(var(--space-2), env(safe-area-inset-bottom));
}

.app-nav__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: 500;
  transition: color var(--transition-fast);
  text-decoration: none;
}

.app-nav__item:hover,
.app-nav__item--active {
  color: var(--color-accent);
}

.app-nav__icon {
  width: 22px;
  height: 22px;
}

/* FAB (Floating Action Button) */
.fab {
  position: fixed;
  bottom: calc(var(--space-16) + var(--space-4));
  right: var(--space-4);
  z-index: 90;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: var(--color-accent);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.fab:hover {
  background: var(--color-accent-hover);
  transform: scale(1.05);
  box-shadow: var(--shadow-xl);
}

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

.fab svg {
  width: 24px;
  height: 24px;
}

/* View transitions */
.view-container {
  animation: viewFadeIn var(--transition-normal) ease;
}

@keyframes viewFadeIn {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Desktop layout */
@media (min-width: 768px) {
  .app-nav {
    position: static;
    border-top: none;
    border-bottom: 1px solid var(--color-border-light);
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
  }

  .app-nav__item {
    flex-direction: row;
    gap: var(--space-2);
    font-size: var(--text-sm);
    padding: var(--space-2) var(--space-4);
  }

  .app-main {
    padding-bottom: var(--space-8);
  }

  .fab {
    bottom: var(--space-8);
    right: calc(50% - 400px + var(--space-4));
  }
}

@media (min-width: 1024px) {
  .fab {
    right: calc(50% - 400px - var(--space-16));
  }
}

/* Auth layout — centered card */
.auth-layout {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  padding: var(--space-4);
  background: linear-gradient(135deg, var(--color-warm-50) 0%, var(--color-amber-50) 100%);
}

/* Loading spinner */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-16);
  color: var(--color-text-muted);
  font-family: var(--font-heading);
}

.loading::after {
  content: '';
  width: 20px;
  height: 20px;
  margin-left: var(--space-3);
  border: 2px solid var(--color-warm-200);
  border-top-color: var(--color-accent);
  border-radius: var(--radius-full);
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: var(--space-16) var(--space-4);
  color: var(--color-text-muted);
}

.empty-state__icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
  opacity: 0.5;
}

.empty-state__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.empty-state__text {
  font-size: var(--text-sm);
  max-width: 300px;
  margin: 0 auto;
}