/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary-color: #64748b;
  --success-color: #10b981;
  --danger-color: #ef4444;
  --warning-color: #f59e0b;
  --info-color: #3b82f6;
  
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  
  --border-color: #e2e8f0;
  --border-light: #f1f5f9;
  
  --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, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* Header */
.header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
}

.logo i {
  font-size: 1.75rem;
}

.header-stats {
  display: flex;
  gap: var(--spacing-xl);
}

.stat-item {
  text-align: right;
}

.stat-label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
}

.stat-value {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* Main Content */
.main-content {
  padding: var(--spacing-xl) 0;
}

/* Dashboard Overview */
.dashboard-overview {
  margin-bottom: var(--spacing-2xl);
}

.overview-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.overview-card {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  transition: all 0.3s ease;
  border: 1px solid var(--border-light);
}

.overview-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.card-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: white;
}

.income-card .card-icon {
  background: linear-gradient(135deg, var(--success-color), #059669);
}

.expense-card .card-icon {
  background: linear-gradient(135deg, var(--danger-color), #dc2626);
}

.balance-card .card-icon {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

.card-content h3 {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
}

.card-content .amount {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.change {
  font-size: 0.875rem;
  font-weight: 500;
}

.change.positive {
  color: var(--success-color);
}

.change.negative {
  color: var(--danger-color);
}

/* Dashboard Grid */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

/* Section Headers */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.section-header h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.header-actions {
  display: flex;
  gap: var(--spacing-sm);
}

/* Form Section */
.form-section {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-light);
  height: fit-content;
}

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

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

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

.form-group label {
  font-weight: 500;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 0.875rem;
}

.form-group input,
.form-group select {
  padding: 12px var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 1rem;
  transition: all 0.2s ease;
  background: var(--bg-primary);
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group select {
  cursor: pointer;
}

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

.input-error {
  border-color: var(--danger-color) !important;
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1) !important;
}

/* Buttons */
.btn-primary,
.btn-secondary,
.btn-danger {
  padding: 12px var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

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

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

.btn-danger {
  background: var(--danger-color);
  color: white;
}

.btn-danger:hover {
  background: #dc2626;
}

/* Charts Section */
.charts-section {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-light);
}

.charts-grid {
  display: grid;
  gap: var(--spacing-lg);
}

.chart-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  border: 1px solid var(--border-light);
}

.chart-card.large {
  grid-column: 1 / -1;
}

.chart-header {
  margin-bottom: var(--spacing-md);
}

.chart-header h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.text-green {
  color: var(--success-color);
}

.text-red {
  color: var(--danger-color);
}

.chart-container {
  position: relative;
  height: 300px;
}

.chart-empty {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  gap: var(--spacing-sm);
}

.chart-empty i {
  font-size: 3rem;
  opacity: 0.5;
}

/* Transactions Section */
.transactions-section {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-light);
  margin-bottom: var(--spacing-2xl);
}

.filters-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.filter-group label {
  font-weight: 500;
  color: var(--text-primary);
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.filter-group input,
.filter-group select {
  padding: 8px var(--spacing-sm);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  background: var(--bg-primary);
}

.table-container {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
}

.transactions-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-primary);
}

.transactions-table th {
  background: var(--bg-tertiary);
  padding: var(--spacing-md);
  text-align: left;
  font-weight: 600;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
  font-size: 0.875rem;
}

.transactions-table td {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-light);
  font-size: 0.875rem;
}

.transactions-table tbody tr:hover {
  background: var(--bg-secondary);
}

.amount-income {
  color: var(--success-color);
  font-weight: 600;
}

.amount-expense {
  color: var(--danger-color);
  font-weight: 600;
}

.transaction-type {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
}

.transaction-type.income {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success-color);
}

.transaction-type.expense {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger-color);
}

.action-buttons {
  display: flex;
  gap: var(--spacing-xs);
}

.action-btn {
  padding: var(--spacing-xs);
  border: none;
  background: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: all 0.2s ease;
}

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

.action-btn.delete:hover {
  color: var(--danger-color);
}

.no-data {
  text-align: center;
}

.no-data-message {
  padding: var(--spacing-2xl);
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
}

.no-data-message i {
  font-size: 3rem;
  opacity: 0.5;
}

/* Analytics Section */
.analytics-section {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-light);
}

.month-selector {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.month-selector label {
  font-weight: 500;
  color: var(--text-secondary);
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.month-selector input {
  padding: 8px var(--spacing-sm);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  background: var(--bg-primary);
}

.analytics-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-lg);
}

/* Toast Notification */
.toast {
  position: fixed;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  background: var(--success-color);
  color: white;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  transform: translateX(400px);
  transition: transform 0.3s ease;
  z-index: 1000;
}

.toast.show {
  transform: translateX(0);
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.modal-overlay.show {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  max-width: 500px;
  width: 90%;
  transform: scale(0.9);
  transition: transform 0.3s ease;
}

.modal-overlay.show .modal {
  transform: scale(1);
}

.modal-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  color: var(--text-muted);
  padding: var(--spacing-xs);
  border-radius: var(--radius-sm);
}

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

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

.modal-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--border-light);
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-sm);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
  
  .analytics-grid {
    grid-template-columns: 1fr;
  }
  
  .overview-cards {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .header-stats {
    display: none;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .filters-container {
    grid-template-columns: 1fr;
  }
  
  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }
  
  .header-actions {
    width: 100%;
    justify-content: flex-end;
  }
  
  .transactions-table {
    font-size: 0.75rem;
  }
  
  .transactions-table th,
  .transactions-table td {
    padding: var(--spacing-sm);
  }
  
  .chart-container {
    height: 250px;
  }
}

@media (max-width: 480px) {
  .main-content {
    padding: var(--spacing-lg) 0;
  }
  
  .form-section,
  .charts-section,
  .transactions-section,
  .analytics-section {
    padding: var(--spacing-lg);
  }
  
  .overview-card {
    padding: var(--spacing-lg);
  }
  
  .card-icon {
    width: 50px;
    height: 50px;
    font-size: 1.25rem;
  }
  
  .card-content .amount {
    font-size: 1.5rem;
  }
  
  .toast {
    right: var(--spacing-md);
    left: var(--spacing-md);
    transform: translateY(-100px);
  }
  
  .toast.show {
    transform: translateY(0);
  }
}

/* Animation Classes */
.fade-in {
  animation: fadeIn 0.3s ease;
}

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

.slide-in {
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Chart Styling */
.chart-container canvas {
  max-height: 300px;
}

/* Custom Scrollbar */
.table-container::-webkit-scrollbar {
  height: 8px;
}

.table-container::-webkit-scrollbar-track {
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
}

.table-container::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: var(--radius-sm);
}

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