:root {
  --income-color: #2ecc71;
  --expense-color: #e74c3c;
  --savings-color: #3498db;
  --light-color: #ecf0f1;
  --dark-color: #2c3e50;
  --gray-light: #bdc3c7;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --border-radius: 8px;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--dark-color);
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding: 20px;
}

#root {
  max-width: 1200px;
  margin: 0 auto;
}

.app {
  background: white;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.app-header {
  background: var(--dark-color);
  color: white;
  padding: 2rem;
  text-align: center;
}

.app-header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.app-header p {
  opacity: 0.9;
}

.dashboard-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  padding: 2rem;
  background: #f8f9fa;
}

.stat-card {
  background: white;
  padding: 1.5rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  text-align: center;
  border-top: 4px solid;
}

.stat-card.income {
  border-color: var(--income-color);
}

.stat-card.expenses {
  border-color: var(--expense-color);
}

.stat-card.balance {
  border-color: var(--savings-color);
}

.stat-amount {
  font-size: 2rem;
  font-weight: bold;
  margin: 0.5rem 0;
}

.stat-card.income .stat-amount {
  color: var(--income-color);
}

.stat-card.expenses .stat-amount {
  color: var(--expense-color);
}

.stat-card.balance .stat-amount {
  color: var(--savings-color);
}

.app-main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  padding: 2rem;
}

@media (max-width: 968px) {
  .app-main {
    grid-template-columns: 1fr;
  }
}

.transaction-form {
  background: #f8f9fa;
  padding: 1.5rem;
  border-radius: var(--border-radius);
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 2px solid #ddd;
  border-radius: var(--border-radius);
  font-size: 1rem;
  transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--savings-color);
}

.radio-group {
  display: flex;
  gap: 1rem;
}

.radio-option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn {
  background: var(--savings-color);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius);
  font-size: 1rem;
  cursor: pointer;
  transition: background-color 0.3s ease;
  width: 100%;
}

.btn:hover {
  background: #2980b9;
}

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

.btn-income:hover {
  background: #27ae60;
}

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

.btn-expense:hover {
  background: #c0392b;
}

.charts-section {
  margin-top: 2rem;
}

.charts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 1rem;
}

@media (max-width: 768px) {
  .charts-grid {
    grid-template-columns: 1fr;
  }
}

.chart-container {
  background: white;
  padding: 1.5rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  height: 300px;
}

.transaction-list {
  max-height: 400px;
  overflow-y: auto;
}

.transaction-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  border-bottom: 1px solid #eee;
  transition: background-color 0.3s ease;
}

.transaction-item:hover {
  background: #f8f9fa;
}

.transaction-item:last-child {
  border-bottom: none;
}

.transaction-info {
  flex: 1;
}

.transaction-description {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.transaction-meta {
  font-size: 0.9rem;
  color: #666;
}

.transaction-amount {
  font-weight: bold;
  font-size: 1.1rem;
}

.transaction-amount.income {
  color: var(--income-color);
}

.transaction-amount.expense {
  color: var(--expense-color);
}

.delete-btn {
  background: var(--expense-color);
  color: white;
  border: none;
  padding: 0.5rem;
  border-radius: 4px;
  cursor: pointer;
  margin-left: 1rem;
  opacity: 0.7;
  transition: opacity 0.3s ease;
}

.delete-btn:hover {
  opacity: 1;
}

.filter-section {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.filter-section select {
  flex: 1;
  min-width: 150px;
}

.no-transactions {
  text-align: center;
  padding: 2rem;
  color: #666;
  font-style: italic;
}

.text-center { text-align: center; }
.mt-2 { margin-top: 2rem; }
.mb-2 { margin-bottom: 2rem; }
.hidden { display: none; }