/* App Shell Structure */
.app-shell {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* App Header (Glassmorphic) */
.app-header {
  flex-shrink: 0;
  height: calc(60px + env(safe-area-inset-top, 0px));
  padding-top: env(safe-area-inset-top, 0px);
  padding-left: max(var(--space-md), env(safe-area-inset-left));
  padding-right: max(var(--space-md), env(safe-area-inset-right));
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-surface);
  box-shadow: var(--shadow-sm);
  z-index: 100;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-text-main);
}

.brand-logo {
  color: var(--color-primary);
  filter: drop-shadow(0 0 4px rgba(var(--color-primary-rgb), 0.3));
}

.brand-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: var(--font-weight-black);
  letter-spacing: -0.5px;
}

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

/* Active Theme Toggle Icon Swap */
html.dark .sun-icon {
  display: block;
}
html.dark .moon-icon {
  display: none;
}
html.light .sun-icon {
  display: none;
}
html.light .moon-icon {
  display: block;
}

/* Main Content Area */
.app-content {
  flex: 1;
  min-height: 0; /* crucial for iOS flex overflow to work */
  overflow-y: auto;
  -webkit-overflow-scrolling: touch; /* smooth scrolling on iOS */
  position: relative;
  padding-left: max(0px, env(safe-area-inset-left));
  padding-right: max(0px, env(safe-area-inset-right));
}

/* Bottom Navigation Tab Bar */
.app-nav {
  flex-shrink: 0;
  height: calc(60px + env(safe-area-inset-bottom, 0px));
  padding-bottom: env(safe-area-inset-bottom, 0px);
  padding-left: env(safe-area-inset-left, 0px);
  padding-right: env(safe-area-inset-right, 0px);
  display: flex;
  justify-content: space-around;
  align-items: center;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  z-index: 100;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  width: 25%;
  height: 100%;
  text-decoration: none;
  font-size: 11px;
  font-weight: var(--font-weight-medium);
  gap: 4px;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.nav-item i {
  width: 22px;
  height: 22px;
  transition: transform var(--transition-fast);
}

.nav-item:active i {
  transform: scale(0.9);
}

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

.nav-item.active i {
  color: var(--color-primary);
  filter: drop-shadow(0 0 2px rgba(var(--color-primary-rgb), 0.2));
}

/* Lockscreen Overlay */
.lockscreen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--space-lg);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.lockscreen.active {
  opacity: 1;
  visibility: visible;
}

.lockscreen-card {
  width: 100%;
  max-width: 400px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-center: center;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: var(--space-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.lockscreen-logo {
  color: var(--color-primary);
  margin-bottom: var(--space-md);
  filter: drop-shadow(0 0 10px rgba(var(--color-primary-rgb), 0.4));
  animation: logo-float 4s ease-in-out infinite;
}

@keyframes logo-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.lockscreen-title {
  font-size: 28px;
  font-weight: var(--font-weight-black);
  margin-bottom: var(--space-2xs);
  letter-spacing: -1px;
}

.lockscreen-subtitle {
  color: var(--color-text-muted);
  font-size: 14px;
  margin-bottom: var(--space-xl);
}

.auth-section {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  animation: fade-in var(--transition-normal) forwards;
}

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

.auth-sec-title {
  font-size: 18px;
  margin-bottom: var(--space-2xs);
}

.auth-sec-text {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  text-align: center;
}

/* Spinner */
.auth-loading-spinner {
  border: 3px solid rgba(var(--color-primary-rgb), 0.1);
  border-radius: 50%;
  border-top: 3px solid var(--color-primary);
  width: 32px;
  height: 32px;
  animation: spin 1s linear infinite;
  margin: var(--space-md);
}

.loading-module-spinner {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  width: 100%;
  position: absolute;
  top: 0;
  left: 0;
  background-color: var(--color-bg);
  z-index: 10;
}

.loading-module-spinner .spinner {
  border: 4px solid rgba(var(--color-primary-rgb), 0.1);
  border-radius: 50%;
  border-top: 4px solid var(--color-primary);
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* PIN Fallback Input */
.pin-input-container {
  margin-bottom: var(--space-xs);
}

#pin-digit-input, .pin-setup-group input {
  font-size: 24px;
  letter-spacing: 12px;
  text-align: center;
  max-width: 200px;
  padding: 12px;
  border-radius: var(--radius-lg);
  font-weight: var(--font-weight-bold);
}

.pin-setup-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  width: 100%;
}

.pin-setup-group label {
  margin-top: var(--space-xs);
}

.setup-options {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.setup-divider {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: var(--space-md) 0;
}

.setup-divider::before, .setup-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background-color: var(--color-border);
}

.setup-divider span {
  padding: 0 var(--space-sm);
  font-size: 12px;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-muted);
}

.auth-error-msg {
  color: var(--color-danger);
  font-size: 13px;
  background-color: var(--color-danger-bg);
  border-radius: var(--radius-sm);
  padding: var(--space-xs);
  width: 100%;
  text-align: center;
  margin-bottom: var(--space-xs);
}

/* Toast System */
.toast-container {
  position: fixed;
  bottom: calc(60px + env(safe-area-inset-bottom, 0px));
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  width: 90%;
  max-width: 350px;
  pointer-events: none;
}

.toast {
  background-color: var(--color-surface);
  color: var(--color-text-main);
  border: 1px solid var(--color-border);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  animation: toast-slide-up var(--transition-normal) forwards;
  font-size: 14px;
}

.toast-success {
  border-left: 4px solid var(--color-success);
}

.toast-success i {
  color: var(--color-success);
}

.toast-error {
  border-left: 4px solid var(--color-danger);
}

.toast-error i {
  color: var(--color-danger);
}

@keyframes toast-slide-up {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.toast.fade-out {
  animation: toast-fade-out var(--transition-normal) forwards;
}

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

/* Dynamic Modals & Bottom Sheets */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6);
  z-index: 500;
  opacity: 0;
  transition: opacity var(--transition-normal);
  display: flex;
  align-items: flex-end; /* Mobile defaults to bottom sheet */
  justify-content: center;
}

.modal-backdrop.active {
  opacity: 1;
}

.modal-sheet {
  background-color: var(--color-surface);
  width: 100%;
  max-width: 500px;
  border-top-left-radius: var(--radius-xl);
  border-top-right-radius: var(--radius-xl);
  padding: var(--space-lg);
  padding-bottom: calc(var(--space-lg) + env(safe-area-inset-bottom, 0px));
  box-shadow: var(--shadow-lg);
  transform: translateY(100%);
  transition: transform var(--transition-normal);
  display: flex;
  flex-direction: column;
  max-height: 90%;
}

.modal-sheet.active {
  transform: translateY(0);
}

/* Desktop Modals fallback */
@media (min-width: 768px) {
  .modal-backdrop {
    align-items: center;
  }
  
  .modal-sheet {
    border-radius: var(--radius-xl);
    padding-bottom: var(--space-lg);
    transform: scale(0.9);
    opacity: 0;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
  }
  
  .modal-sheet.active {
    transform: scale(1);
    opacity: 1;
  }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
}

.modal-title {
  font-size: 20px;
  font-family: var(--font-display);
}

.modal-close {
  cursor: pointer;
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  transition: background-color var(--transition-fast);
}

.modal-close:hover {
  background-color: var(--color-surface-hover);
}

.modal-body {
  overflow-y: auto;
  flex: 1;
}

/* Pull-to-Refresh styles */
.pull-to-refresh-indicator {
  position: absolute;
  top: calc(60px + env(safe-area-inset-top, 0px)); /* matches app-header height */
  left: 0;
  right: 0;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  color: var(--color-primary);
  font-size: 13px;
  font-weight: var(--font-weight-medium);
  z-index: 90;
  transform: translateY(-50px); /* hidden behind header */
  transition: transform var(--transition-fast) ease-out, opacity var(--transition-fast);
  pointer-events: none;
  opacity: 0;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.pull-to-refresh-indicator i {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.pull-to-refresh-indicator.ready i {
  transform: rotate(180deg);
  color: var(--color-yellow);
}

.pull-to-refresh-indicator.refreshing i {
  animation: spin 1s linear infinite;
}

.spinner-inline {
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  border-top: 2px solid currentColor;
  width: 14px;
  height: 14px;
  animation: spin 1s linear infinite;
  display: inline-block;
}