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

:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --secondary: #8b5cf6;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --info: #3b82f6;
  --light: #f3f4f6;
  --dark: #1f2937;
  --border: #e5e7eb;
  --text: #374151;
  --text-light: #6b7280;
  --bg: #ffffff;
  --shadow: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: #f9fafb;
  color: var(--text);
  line-height: 1.6;
}

.app-container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 250px;
  background: var(--dark);
  color: white;
  padding: 1.5rem;
  position: fixed;
  height: 100vh;
  overflow-y: auto;
}

.logo h1 {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}

.logo p {
  font-size: 0.875rem;
  opacity: 0.8;
  margin-bottom: 2rem;
}

.nav-menu {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.nav-item {
  background: transparent;
  color: white;
  border: none;
  padding: 0.875rem 1rem;
  text-align: left;
  border-radius: 0.5rem;
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.2s;
  opacity: 0.8;
}

.nav-item:hover {
  background: rgba(255,255,255,0.1);
  opacity: 1;
}

.nav-item.active {
  background: var(--primary);
  opacity: 1;
}

/* Main Content */
.main-content {
  flex: 1;
  margin-left: 250px;
  padding: 2rem;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  background: white;
  padding: 1.5rem;
  border-radius: 0.75rem;
  box-shadow: var(--shadow);
}

.header h2 {
  font-size: 1.875rem;
  color: var(--dark);
}

.date-selector {
  display: flex;
  gap: 0.5rem;
}

.date-selector select {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  font-size: 0.875rem;
  cursor: pointer;
  background: white;
}

/* Views */
.view {
  display: none;
}

.view.active {
  display: block;
}

/* Summary Cards */
.summary-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.card {
  background: white;
  padding: 1.5rem;
  border-radius: 0.75rem;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 1rem;
}

.card-icon {
  font-size: 2.5rem;
  opacity: 0.9;
}

.card-content {
  flex: 1;
}

.card-label {
  font-size: 0.875rem;
  color: var(--text-light);
  margin-bottom: 0.25rem;
}

.card-value {
  font-size: 1.875rem;
  font-weight: 700;
}

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

.card-income .card-value {
  color: var(--success);
}

.card-expense {
  border-left: 4px solid var(--danger);
}

.card-expense .card-value {
  color: var(--danger);
}

.card-balance {
  border-left: 4px solid var(--primary);
}

.card-balance .card-value {
  color: var(--primary);
}

/* Charts */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.chart-card {
  background: white;
  padding: 1.5rem;
  border-radius: 0.75rem;
  box-shadow: var(--shadow);
}

.chart-card h3 {
  margin-bottom: 1rem;
  color: var(--dark);
}

/* Transactions */
.recent-transactions {
  background: white;
  padding: 1.5rem;
  border-radius: 0.75rem;
  box-shadow: var(--shadow);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.transactions-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.transaction-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  transition: all 0.2s;
}

.transaction-item:hover {
  background: var(--light);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.transaction-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.transaction-category {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.transaction-details h4 {
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
}

.transaction-details p {
  font-size: 0.8rem;
  color: var(--text-light);
}

.transaction-amount {
  font-size: 1.125rem;
  font-weight: 700;
}

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

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

/* Buttons */
.btn {
  padding: 0.625rem 1.25rem;
  border: none;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

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

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

.btn-secondary {
  background: var(--light);
  color: var(--text);
}

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

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

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

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.8rem;
}

/* Table */
.table-container {
  background: white;
  border-radius: 0.75rem;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th {
  background: var(--light);
  padding: 1rem;
  text-align: left;
  font-weight: 600;
  color: var(--dark);
  border-bottom: 2px solid var(--border);
}

.data-table td {
  padding: 1rem;
  border-bottom: 1px solid var(--border);
}

.data-table tbody tr:hover {
  background: var(--light);
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-income {
  background: #d1fae5;
  color: #065f46;
}

.badge-expense {
  background: #fee2e2;
  color: #991b1b;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: white;
  border-radius: 0.75rem;
  width: 90%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-light);
  padding: 0;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.25rem;
}

.close-btn:hover {
  background: var(--light);
  color: var(--text);
}

form {
  padding: 1.5rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--dark);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.625rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  font-size: 0.875rem;
  font-family: inherit;
}

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

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: normal;
  cursor: pointer;
}

.checkbox-label input {
  width: auto;
}

.form-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  margin-top: 1rem;
}

/* View Header */
.view-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.action-bar {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: white;
  border-radius: 0.75rem;
  box-shadow: var(--shadow);
}

.info-box {
  background: #eff6ff;
  border-left: 4px solid var(--info);
  padding: 1rem;
  border-radius: 0.5rem;
  margin-bottom: 1rem;
}

.info-box p {
  margin-bottom: 0.25rem;
  color: var(--dark);
}

.info-box ul {
  color: var(--text);
  line-height: 1.8;
}

.filters {
  display: flex;
  gap: 0.75rem;
}

/* Categories */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.category-section {
  background: white;
  padding: 1.5rem;
  border-radius: 0.75rem;
  box-shadow: var(--shadow);
}

.category-section h4 {
  margin-bottom: 1rem;
  color: var(--dark);
}

.categories-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.category-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.875rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  transition: all 0.2s;
}

.category-item:hover {
  background: var(--light);
  box-shadow: var(--shadow);
}

.category-color {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  flex-shrink: 0;
}

.category-name {
  flex: 1;
  font-weight: 500;
}

.category-item .btn-sm {
  opacity: 0;
  transition: opacity 0.2s;
}

.category-item:hover .btn-sm {
  opacity: 1;
}

/* Reports */
.report-chart {
  background: white;
  padding: 1.5rem;
  border-radius: 0.75rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.5rem;
}

.monthly-summary {
  background: white;
  padding: 1.5rem;
  border-radius: 0.75rem;
  box-shadow: var(--shadow);
}

.monthly-summary table {
  width: 100%;
}

.monthly-summary th {
  text-align: left;
  padding: 0.75rem;
  background: var(--light);
  font-weight: 600;
}

.monthly-summary td {
  padding: 0.75rem;
  border-bottom: 1px solid var(--border);
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    width: 200px;
  }
  
  .main-content {
    margin-left: 200px;
    padding: 1rem;
  }
  
  .header {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }
  
  .charts-grid {
    grid-template-columns: 1fr;
  }
  
  .summary-cards {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 576px) {
  .app-container {
    flex-direction: column;
  }
  
  .sidebar {
    width: 100%;
    height: auto;
    position: relative;
  }
  
  .main-content {
    margin-left: 0;
  }
  
  .nav-menu {
    flex-direction: row;
    overflow-x: auto;
  }
}