:root {
  /* Colors */
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary: #8b5cf6;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --info: #3b82f6;

  /* Backgrounds */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-card: rgba(30, 41, 59, 0.8);
  --bg-glass: rgba(255, 255, 255, 0.05);

  /* Text */
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;

  /* Borders */
  --border-color: rgba(255, 255, 255, 0.1);
  --border-radius: 12px;
  --border-radius-lg: 16px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* SVG Icon System */
.icon {
  display: inline-block;
  width: 1em;
  height: 1em;
  vertical-align: -0.125em;
  fill: none;
  stroke: currentColor;
}

.stat-icon .icon {
  width: 2rem;
  height: 2rem;
}

.nav-icon .icon {
  width: 1.5rem;
  height: 1.5rem;
}

.action-icon .icon {
  width: 2.5rem;
  height: 2.5rem;
}

/* Touch optimization */
button, a, select, .nav-item, .action-btn, .auth-tab, .voucher-item {
  touch-action: manipulation;
}

body {
  font-family:
    "Inter",
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  min-height: 100svh;
  overflow-x: hidden;
}

/* Screen Management */
.screen {
  display: none;
}

.screen.active {
  display: block;
}

/* Auth Screen */
.auth-container {
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
  background: radial-gradient(
    circle at 50% 0%,
    rgba(99, 102, 241, 0.1) 0%,
    transparent 50%
  );
}

.auth-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-xl);
  animation: slideUp 0.4s ease;
}

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

.auth-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.auth-header h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-light);
  margin-bottom: var(--spacing-sm);
}

.auth-header h1 .icon {
  stroke: var(--primary-light);
}

.auth-header p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.auth-tabs {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  background: var(--bg-glass);
  padding: 4px;
  border-radius: var(--border-radius);
}

.auth-tab {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  min-height: 44px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-weight: 500;
  cursor: pointer;
  border-radius: calc(var(--border-radius) - 4px);
  transition: all var(--transition-base);
}

.auth-tab.active {
  background: var(--primary);
  color: white;
  box-shadow: var(--shadow-glow);
}

.auth-form {
  display: none;
}

.auth-form.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

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

/* Form Elements */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.9rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  color: var(--text-primary);
  font-size: max(16px, 1rem);
  transition: all var(--transition-base);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* Buttons */
.btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  min-height: 44px;
  border: none;
  border-radius: var(--border-radius);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-base);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: var(--bg-secondary);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--border-color);
  color: var(--text-primary);
}

.btn-outline:hover {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.1);
}

.error-message {
  color: var(--error);
  font-size: 0.875rem;
  margin-top: var(--spacing-sm);
  display: none;
}

.error-message:not(:empty) {
  display: block;
}

/* App Header */
.app-header {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  padding: max(var(--spacing-md), env(safe-area-inset-top)) max(var(--spacing-lg), env(safe-area-inset-right)) var(--spacing-md) max(var(--spacing-lg), env(safe-area-inset-left));
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1400px;
  margin: 0 auto;
}

.header-content h1 {
  font-size: 1.5rem;
  font-weight: 700;
}

.header-actions {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

.activity-select {
  padding: var(--spacing-sm) var(--spacing-md);
  min-height: 44px;
  font-size: max(16px, 1rem);
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  color: var(--text-primary);
  cursor: pointer;
  min-width: 200px;
}

/* Main Content */
.app-main {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-xl);
  padding-bottom: calc(100px + env(safe-area-inset-bottom, 0px));
  padding-left: max(var(--spacing-xl), env(safe-area-inset-left));
  padding-right: max(var(--spacing-xl), env(safe-area-inset-right));
}

.view {
  display: none;
}

.view.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

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

.view-header h2 {
  font-size: 1.75rem;
  font-weight: 700;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.stat-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
  transition: all var(--transition-base);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.stat-icon {
  font-size: 2.5rem;
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-glass);
  border-radius: var(--border-radius);
}

.stat-content h3 {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* Quick Actions */
.quick-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.action-btn {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border: none;
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  color: white;
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  transition: all var(--transition-base);
}

.action-btn:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.action-icon {
  font-size: 3rem;
}

/* Voucher Form */
.voucher-form {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  max-width: 500px;
}

/* QR Result */
.qr-result {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  text-align: center;
  max-width: 500px;
  margin-top: var(--spacing-xl);
}

.qr-result.hidden {
  display: none;
}

.qr-result h3 {
  color: var(--success);
  margin-bottom: var(--spacing-lg);
  font-size: 1.5rem;
}

.qr-code-display {
  background: white;
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-lg);
  display: inline-block;
}

.qr-code-display img {
  display: block;
  max-width: 300px;
}

.customer-info,
.amount-info {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-sm);
}

.customer-info span,
.amount-info span {
  font-weight: 700;
  color: var(--primary-light);
}

/* Scanner */
.scanner-container {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  max-width: 600px;
  margin: 0 auto;
}

#qr-reader {
  border-radius: var(--border-radius);
  overflow: hidden;
}

.scanner-hint {
  text-align: center;
  color: var(--text-secondary);
  margin-top: var(--spacing-md);
}

.scan-result {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  max-width: 600px;
  margin: var(--spacing-xl) auto 0;
}

.scan-result.hidden {
  display: none;
}

/* Bottom Navigation */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-around;
  padding: var(--spacing-sm) env(safe-area-inset-right, 0px) max(var(--spacing-sm), env(safe-area-inset-bottom)) env(safe-area-inset-left, 0px);
  z-index: 100;
}

.nav-item {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: var(--spacing-xs) var(--spacing-md);
  min-height: 44px;
  transition: all var(--transition-base);
  flex: 1;
}

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

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

.nav-icon {
  font-size: 1.5rem;
}

.nav-label {
  font-size: 0.75rem;
  font-weight: 500;
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.loading-overlay.hidden {
  display: none;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 4px solid var(--bg-tertiary);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  z-index: 1001;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.toast {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-md) var(--spacing-lg);
  box-shadow: var(--shadow-lg);
  min-width: 300px;
  animation: slideInRight 0.3s ease;
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(100px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

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

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

/* Vouchers List */
.vouchers-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.voucher-item {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all var(--transition-base);
}

.voucher-item:hover {
  border-color: var(--primary);
  transform: translateX(4px);
}

.voucher-badge {
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}

.voucher-badge.redeemed {
  background: rgba(16, 185, 129, 0.2);
  color: var(--success);
}

.voucher-badge.pending {
  background: rgba(245, 158, 11, 0.2);
  color: var(--warning);
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--spacing-lg);
}

.modal.hidden {
  display: none;
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  max-width: 500px;
  width: 100%;
  animation: slideUp 0.3s ease;
}

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

.modal-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all var(--transition-base);
}

.modal-close:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

/* Filter Selects */
.filter-select {
  min-height: 44px;
  font-size: max(16px, 1rem);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  color: var(--text-primary);
}

.table-filters {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

/* Responsive */
@media (max-width: 768px) {
  /* Main content */
  .app-main {
    padding: var(--spacing-sm);
    padding-bottom: calc(80px + env(safe-area-inset-bottom, 0px));
    padding-left: max(var(--spacing-sm), env(safe-area-inset-left));
    padding-right: max(var(--spacing-sm), env(safe-area-inset-right));
  }

  /* Header - stack vertically */
  .header-content {
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }

  .header-content h1 {
    font-size: 1.1rem;
  }

  .header-actions {
    width: 100%;
    gap: var(--spacing-sm);
  }

  .activity-select {
    min-width: 0;
    flex: 1;
    font-size: max(16px, 0.875rem);
  }

  #logout-btn {
    font-size: 0.8rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    white-space: nowrap;
  }

  /* Stats */
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
  }

  .stat-card {
    padding: var(--spacing-sm);
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-xs);
  }

  .stat-icon {
    width: 40px;
    height: 40px;
    font-size: 1.5rem;
  }

  .stat-icon .icon {
    width: 1.5rem;
    height: 1.5rem;
  }

  .stat-content h3 {
    font-size: 0.7rem;
  }

  .stat-value {
    font-size: 1.2rem;
  }

  /* Quick actions */
  .quick-actions {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
  }

  .action-btn {
    padding: var(--spacing-md);
    font-size: 0.9rem;
  }

  .action-icon {
    font-size: 2rem;
  }

  .action-icon .icon {
    width: 2rem;
    height: 2rem;
  }

  /* View headers */
  .view-header {
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
  }

  .view-header h2 {
    font-size: 1.25rem;
    width: 100%;
  }

  /* Buttons full width in forms */
  .voucher-form .btn,
  .auth-form .btn,
  #activity-form .btn {
    width: 100%;
  }

  /* QR result */
  .qr-result {
    padding: var(--spacing-md);
  }

  .qr-code-display {
    padding: var(--spacing-sm);
  }

  .qr-code-display img {
    max-width: 100%;
  }

  .qr-result .btn {
    width: 100%;
    margin-bottom: var(--spacing-sm);
  }

  /* Voucher form */
  .voucher-form {
    padding: var(--spacing-md);
  }

  /* Filters */
  .table-filters {
    flex-direction: column;
  }

  .filter-select {
    width: 100%;
  }

  /* Voucher items */
  .voucher-item {
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }

  .voucher-item > div:first-child {
    min-width: 0;
    flex: 1;
  }

  .voucher-item h4 {
    font-size: 0.9rem;
    word-break: break-word;
  }

  /* Toast */
  .toast-container {
    left: var(--spacing-sm);
    right: var(--spacing-sm);
  }

  .toast {
    min-width: 0;
    width: 100%;
  }

  /* Scanner */
  .scanner-container {
    padding: var(--spacing-sm);
  }

  .scan-result {
    padding: var(--spacing-md);
  }

  .scan-result .btn {
    width: 100%;
    margin-bottom: var(--spacing-sm);
  }

  /* Bottom nav compact */
  .nav-item {
    padding: var(--spacing-xs) 0;
  }

  .nav-label {
    font-size: 0.65rem;
  }

  /* Auth */
  .auth-card {
    padding: var(--spacing-md);
  }

  .auth-header h1 {
    font-size: 1.5rem;
  }

  /* Modal */
  .modal {
    padding: var(--spacing-sm);
  }

  .modal-content {
    padding: var(--spacing-md);
  }

  /* Recent vouchers */
  .recent-vouchers h2 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
  }

  /* Metrics sections */
  .metrics-summary h3,
  .metrics-by-activity h3,
  .vouchers-table h3 {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
  }
}

/* Respect reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Utilities */
.hidden {
  display: none !important;
}

.text-center {
  text-align: center;
}

.mt-1 {
  margin-top: var(--spacing-sm);
}
.mt-2 {
  margin-top: var(--spacing-md);
}
.mt-3 {
  margin-top: var(--spacing-lg);
}

.mb-1 {
  margin-bottom: var(--spacing-sm);
}
.mb-2 {
  margin-bottom: var(--spacing-md);
}
.mb-3 {
  margin-bottom: var(--spacing-lg);
}