:root {
  /* Dark Theme Color System */
  --primary-50: #1e293b;
  --primary-100: #334155;
  --primary-500: #06b6d4;
  --primary-600: #0891b2;
  --primary-700: #0e7490;
  
  --success-50: #064e3b;
  --success-100: #065f46;
  --success-500: #10b981;
  --success-600: #059669;
  
  --warning-50: #451a03;
  --warning-100: #78350f;
  --warning-500: #f59e0b;
  
  --error-50: #450a0a;
  --error-500: #ef4444;
  
  --accent-cyan: #22d3ee;
  --accent-purple: #a855f7;
  --accent-pink: #ec4899;
  --accent-green: #22c55e;
  
  /* Dark background colors */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-card: #1e293b;
  --bg-card-hover: #334155;
  
  /* Dark text colors */
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  --text-accent: #94a3b8;
  
  /* Border colors */
  --border-primary: #334155;
  --border-secondary: #475569;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 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;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  
  /* Spacing */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-10: 2.5rem;
  --spacing-12: 3rem;
  --spacing-16: 4rem;
  
  /* Shadows for dark theme */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.4);
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

.container {
  max-width: 428px;
  margin: 0 auto;
  padding: var(--spacing-4);
  min-height: 100vh;
}

/* Login Page Styles */
.login-container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: var(--spacing-6);
}

.login-card {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-12);
  width: 100%;
  max-width: 400px;
  text-align: center;
}

.login-logo {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-4);
  background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--primary-600) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
}

.login-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-2);
}

.login-subtitle {
  font-size: var(--font-size-base);
  color: var(--text-muted);
  margin-bottom: var(--spacing-8);
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-6);
}

.form-group {
  text-align: left;
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-2);
}

.form-input {
  width: 100%;
  padding: var(--spacing-4);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  transition: all 0.2s ease;
}

.form-input:focus {
  outline: none;
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.1);
}

.form-input::placeholder {
  color: var(--text-muted);
}

.login-btn {
  width: 100%;
  padding: var(--spacing-4);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--primary-600) 100%);
  color: white;
  box-shadow: 0 4px 15px rgba(34, 211, 238, 0.3);
}

.login-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(34, 211, 238, 0.4);
}

.login-btn:active {
  transform: scale(0.98);
}

.login-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Dashboard Styles */
.dashboard {
  display: none;
}

.dashboard.active {
  display: block;
}

/* Header Styles */
.header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding-bottom: var(--spacing-8);
  border-bottom: 1px solid var(--border-primary);
  margin-bottom: var(--spacing-8);
}

.user-greeting h1 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-1);
}

.last-updated {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.notification-icon {
  position: relative;
  font-size: var(--font-size-xl);
  cursor: pointer;
  transition: transform 0.2s ease;
  color: var(--text-secondary);
}

.notification-icon:hover {
  transform: scale(1.1);
  color: var(--accent-cyan);
}

.notification-dot {
  position: absolute;
  top: -2px;
  right: -2px;
  width: 8px;
  height: 8px;
  background-color: var(--accent-pink);
  border-radius: 50%;
  animation: pulse 2s infinite;
  box-shadow: 0 0 8px var(--accent-pink);
}

@keyframes pulse {
  0%, 100% { 
    opacity: 1; 
    transform: scale(1);
  }
  50% { 
    opacity: 0.7;
    transform: scale(1.1);
  }
}

/* Card Styles */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  background: var(--bg-card-hover);
  border-color: var(--border-secondary);
}

.card-header {
  padding: var(--spacing-5) var(--spacing-6) var(--spacing-2);
}

.card-title {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-1);
}

.card-subtitle {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-content {
  padding: 0 var(--spacing-6) var(--spacing-6);
}

/* Balance Section */
.balance-section {
  margin-bottom: var(--spacing-8);
}

.primary-card {
  background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-700) 100%);
  color: white;
  border: 1px solid var(--primary-500);
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.3);
}

.primary-card .card-title,
.primary-card .card-subtitle {
  color: rgba(255, 255, 255, 0.9);
}

.balance-amount {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  line-height: 1.1;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-8);
}

.rate-card {
  background: linear-gradient(135deg, var(--accent-purple) 0%, #7c3aed 100%);
  color: white;
  border: 1px solid var(--accent-purple);
  box-shadow: 0 0 20px rgba(168, 85, 247, 0.3);
}

.rate-card .card-title,
.rate-card .card-subtitle {
  color: rgba(255, 255, 255, 0.9);
}

.earned-card {
  background: linear-gradient(135deg, var(--accent-green) 0%, #16a34a 100%);
  color: white;
  border: 1px solid var(--accent-green);
  box-shadow: 0 0 20px rgba(34, 197, 94, 0.3);
}

.earned-card .card-title,
.earned-card .card-subtitle {
  color: rgba(255, 255, 255, 0.9);
}

.rate-display,
.earned-amount {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  line-height: 1.1;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* Interest Section */
.interest-section {
  margin-bottom: var(--spacing-8);
}

.section-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-6);
}

.interest-grid {
  display: grid;
  gap: var(--spacing-4);
}

.interest-amount {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--spacing-2);
}

.interest-amount.accumulated {
  color: var(--accent-green);
  text-shadow: 0 0 10px rgba(34, 197, 94, 0.5);
}

.interest-amount.pending {
  color: var(--accent-cyan);
  text-shadow: 0 0 10px rgba(34, 211, 238, 0.5);
}

.interest-growth {
  font-size: var(--font-size-sm);
  color: var(--accent-green);
  font-weight: 500;
}

.interest-note {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* Quick Actions */
.quick-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4);
  margin-top: var(--spacing-8);
}

.action-btn {
  padding: var(--spacing-4) var(--spacing-6);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.action-btn.primary {
  background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--primary-600) 100%);
  color: white;
  box-shadow: 0 4px 15px rgba(34, 211, 238, 0.3);
}

.action-btn.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(34, 211, 238, 0.4);
}

.action-btn.secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-secondary);
}

.action-btn.secondary:hover {
  background-color: var(--border-secondary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.action-btn:active {
  transform: scale(0.98);
}

/* Modal Styles */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(15,23,42,0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.modal {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: 2rem;
  max-width: 350px;
  width: 100%;
  text-align: center;
  color: var(--text-primary);
}
.modal h2 {
  margin-bottom: 1rem;
  font-size: var(--font-size-xl);
}
.modal-close-btn {
  margin-top: 2rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--primary-600) 100%);
  color: white;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}
.modal-close-btn:hover {
  background: var(--accent-green);
}

/* Responsive Design */
@media (max-width: 375px) {
  .container {
    padding: var(--spacing-3);
  }
  
  .login-card {
    padding: var(--spacing-8);
  }
  
  .user-greeting h1 {
    font-size: var(--font-size-xl);
  }
  
  .balance-amount {
    font-size: var(--font-size-3xl);
  }
  
  .metrics-grid {
    grid-template-columns: 1fr;
  }
  
  .quick-actions {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 429px) {
  .container {
    max-width: 100%;
    padding: var(--spacing-6);
  }
  
  .interest-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* Loading Animation */
@keyframes shimmer {
  0% {
    background-position: -200px 0;
  }
  100% {
    background-position: calc(200px + 100%) 0;
  }
}

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

/* Focus states */
.action-btn:focus,
.notification-icon:focus,
.form-input:focus,
.login-btn:focus {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
}

/* Glow effects for dark theme */
.card:hover {
  box-shadow: var(--shadow-lg), 0 0 20px rgba(34, 211, 238, 0.1);
}

/* Custom scrollbar for dark theme */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-secondary);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}