:root {
  /* Amazon-inspired color palette */
  --amazon-orange: #FF9900;
  --amazon-blue: #232F3E;
  --amazon-light-blue: #37475A;
  --amazon-gray: #F7F8F8;
  --amazon-dark-gray: #D5D9D9;
  --amazon-black: #131921;
  --amazon-white: #FFFFFF;
  
  /* Additional colors for app functionality */
  --success-color: #067D62;
  --warning-color: #F59E0B;
  --danger-color: #DC2626;
  --info-color: #2563EB;
  
  /* Typography */
  --font-family: 'Amazon Ember', Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  
  /* Border radius */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  
  /* 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), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  /* Support for mobile browsers viewport height */
  height: 100%;
  height: -webkit-fill-available;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.5;
  color: var(--amazon-black);
  background-color: var(--amazon-gray);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  /* Prevent pull-to-refresh */
  overscroll-behavior-y: contain;
  /* Prevent zoom on input focus */
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  /* Fix for mobile browsers */
  margin: 0;
  padding: 0;
  position: fixed;
  width: 100%;
  height: 100%;
}

/* Allow text selection for content areas */
.content-area * {
  -webkit-user-select: text;
  -moz-user-select: text;
  -ms-user-select: text;
  user-select: text;
}

/* Prevent accidental refresh and back navigation */
.app-container {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  min-height: 100vh;
  min-height: -webkit-fill-available;
  overflow: hidden;
  /* Support for iOS Safari */
  height: -webkit-fill-available;
}

/* Header styles */
.app-header {
  background: linear-gradient(to bottom, var(--amazon-blue), var(--amazon-light-blue));
  color: var(--amazon-white);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-md);
  z-index: 1000;
  position: relative;
  flex-shrink: 0;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  font-size: var(--font-size-xl);
  font-weight: bold;
  color: var(--amazon-white);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo:hover {
  color: var(--amazon-orange);
}

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

.header-btn {
  background: none;
  border: none;
  color: var(--amazon-white);
  font-size: var(--font-size-lg);
  padding: var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}

.header-btn:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--amazon-orange);
}

/* Main content area */
.main-content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--spacing-md);
  padding-bottom: 80px; /* Account for fixed bottom nav */
  background-color: var(--amazon-gray);
  /* Custom scrollbar */
  scrollbar-width: thin;
  scrollbar-color: var(--amazon-dark-gray) transparent;
  /* Fix for mobile browsers */
  -webkit-overflow-scrolling: touch;
}

.main-content::-webkit-scrollbar {
  width: 4px;
}

.main-content::-webkit-scrollbar-track {
  background: transparent;
}

.main-content::-webkit-scrollbar-thumb {
  background-color: var(--amazon-dark-gray);
  border-radius: 2px;
}

.main-content::-webkit-scrollbar-thumb:hover {
  background-color: var(--amazon-orange);
}

.content-container {
  max-width: 1200px;
  margin: 0 auto;
  padding-bottom: var(--spacing-xl);
}

/* Section content */
.section-content {
  min-height: 100%;
}

.section-header {
  margin-bottom: var(--spacing-lg);
}

.section-title {
  font-size: var(--font-size-2xl);
  font-weight: bold;
  color: var(--amazon-black);
  margin-bottom: var(--spacing-sm);
}

.section-subtitle {
  color: #666;
  font-size: var(--font-size-base);
}

/* Card styles */
.card {
  background: var(--amazon-white);
  border: 1px solid #E5E7EB;
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--spacing-md);
  overflow: hidden;
  transition: all 0.2s ease;
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.card-body {
  padding: var(--spacing-lg);
}

.card-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--amazon-black);
  margin-bottom: var(--spacing-sm);
}

.card-text {
  color: #666;
  line-height: 1.6;
}

/* Button styles */
.btn-amazon {
  background-color: var(--amazon-orange);
  border: 1px solid var(--amazon-orange);
  color: var(--amazon-black);
  font-weight: 600;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--border-radius-sm);
  text-decoration: none;
  display: inline-block;
  text-align: center;
  transition: all 0.2s ease;
  cursor: pointer;
  font-size: var(--font-size-sm);
}

.btn-amazon:hover {
  background-color: #E68900;
  border-color: #E68900;
  color: var(--amazon-black);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn-amazon:active {
  transform: translateY(0);
}

.btn-secondary {
  background-color: var(--amazon-white);
  border: 1px solid var(--amazon-dark-gray);
  color: var(--amazon-black);
  font-weight: 600;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--border-radius-sm);
  text-decoration: none;
  display: inline-block;
  text-align: center;
  transition: all 0.2s ease;
  cursor: pointer;
  font-size: var(--font-size-sm);
}

.btn-secondary:hover {
  background-color: var(--amazon-gray);
  border-color: var(--amazon-orange);
  color: var(--amazon-black);
}

/* Input styles */
.form-control {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--amazon-dark-gray);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  background-color: var(--amazon-white);
  transition: border-color 0.2s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--amazon-orange);
  box-shadow: 0 0 0 2px rgba(255, 153, 0, 0.2);
}

/* Search bar */
.search-container {
  position: relative;
  margin-bottom: var(--spacing-lg);
}

.search-input {
  width: 100%;
  padding: var(--spacing-md);
  padding-right: 3rem;
  border: 2px solid var(--amazon-dark-gray);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-base);
  background-color: var(--amazon-white);
  transition: border-color 0.2s ease;
}

.search-input:focus {
  outline: none;
  border-color: var(--amazon-orange);
  box-shadow: 0 0 0 3px rgba(255, 153, 0, 0.1);
}

.search-btn {
  position: absolute;
  right: var(--spacing-sm);
  top: 50%;
  transform: translateY(-50%);
  background: var(--amazon-orange);
  border: none;
  color: var(--amazon-black);
  padding: var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.search-btn:hover {
  background-color: #E68900;
}

/* Bottom navigation */
.bottom-nav {
  background-color: var(--amazon-white);
  border-top: 1px solid #E5E7EB;
  box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.1);
  padding: var(--spacing-sm) 0;
  z-index: 1000;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  width: 100%;
  flex-shrink: 0;
  /* Ensure it stays at bottom on mobile */
  min-height: 60px;
  padding-bottom: env(safe-area-inset-bottom);
}

.nav-container {
  display: flex;
  justify-content: space-around;
  align-items: center;
  max-width: 600px;
  margin: 0 auto;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--spacing-sm);
  text-decoration: none;
  color: #666;
  transition: all 0.2s ease;
  border-radius: var(--border-radius-sm);
  min-width: 60px;
  cursor: pointer;
}

.nav-item:hover {
  color: var(--amazon-orange);
  background-color: rgba(255, 153, 0, 0.1);
}

.nav-item.active {
  color: var(--amazon-orange);
  background-color: rgba(255, 153, 0, 0.1);
}

.nav-icon {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-xs);
}

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

/* Loading states */
.loading {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--spacing-xl);
  color: #666;
}

.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid #f3f3f3;
  border-top: 2px solid var(--amazon-orange);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-right: var(--spacing-sm);
}

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

/* Grid layouts */
.grid {
  display: grid;
  gap: var(--spacing-md);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* Feature cards */
.feature-card {
  background: var(--amazon-white);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  border: 1px solid #E5E7EB;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  font-size: 3rem;
  color: var(--amazon-orange);
  margin-bottom: var(--spacing-md);
}

.feature-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--amazon-black);
  margin-bottom: var(--spacing-sm);
}

.feature-description {
  color: #666;
  line-height: 1.6;
}

/* Responsive design */
@media (max-width: 768px) {
  .header-content {
    padding: 0;
  }
  
  .logo {
    font-size: var(--font-size-lg);
  }
  
  .header-actions {
    gap: var(--spacing-sm);
  }
  
  .main-content {
    padding: var(--spacing-sm);
    padding-bottom: 80px; /* Ensure space for fixed bottom nav */
  }
  
  .section-title {
    font-size: var(--font-size-xl);
  }
  
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
  
  .feature-card {
    padding: var(--spacing-md);
  }
  
  .feature-icon {
    font-size: 2.5rem;
  }
  
  /* Android Chrome specific fixes */
  .app-container {
    height: 100vh;
    height: calc(var(--vh, 1vh) * 100);
  }
  
  .bottom-nav {
    position: fixed !important;
    bottom: 0 !important;
    left: 0 !important;
    right: 0 !important;
    z-index: 9999 !important;
  }
}

@media (max-width: 480px) {
  .main-content {
    padding: var(--spacing-xs);
  }
  
  .card-body {
    padding: var(--spacing-md);
  }
  
  .nav-label {
    display: none;
  }
  
  .nav-item {
    min-width: 50px;
  }
}

/* Utility classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }
.p-5 { padding: var(--spacing-xl); }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.fade-in {
  animation: fadeIn 0.3s ease-in;
}

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

/* Status indicators */
.status-badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.status-success {
  background-color: rgba(6, 125, 98, 0.1);
  color: var(--success-color);
}

.status-warning {
  background-color: rgba(245, 158, 11, 0.1);
  color: var(--warning-color);
}

.status-danger {
  background-color: rgba(220, 38, 38, 0.1);
  color: var(--danger-color);
}

.status-info {
  background-color: rgba(37, 99, 235, 0.1);
  color: var(--info-color);
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus styles for keyboard navigation */
.nav-item:focus,
.btn-amazon:focus,
.btn-secondary:focus,
.form-control:focus,
.search-btn:focus {
  outline: 2px solid var(--amazon-orange);
  outline-offset: 2px;
}