@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap");
:root {
  --bg-light: #f8fafc;
  --text-light: #1e293b;
  --card-light: #ffffff;
  --border-light: #e2e8f0;
  --bg-dark: #0f172a;
  --text-dark: #f1f5f9;
  --card-dark: #1e293b;
  --border-dark: #334155;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --success: #10b981;
  --success-hover: #059669;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --warning: #f59e0b;
  --info: #06b6d4;
}

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

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg-light);
  color: var(--text-light);
  transition: all 0.3s ease;
  line-height: 1.6;
}

body.dark {
  background: var(--bg-dark);
  color: var(--text-dark);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

.header {
  text-align: center;
  margin-bottom: 30px;
  padding: 20px 0;
}

.header h1 {
  font-size: 2.5rem;
  margin-bottom: 10px;
  background: linear-gradient(135deg, var(--primary), var(--success));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header p {
  opacity: 0.7;
  font-size: 1.1rem;
}

.nav-tabs {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.nav-tab {
  padding: 12px 24px;
  border: 2px solid var(--border-light);
  background: var(--card-light);
  color: var(--text-light);
  border-radius: 25px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

body.dark .nav-tab {
  border-color: var(--border-dark);
  background: var(--card-dark);
  color: var(--text-dark);
}

.nav-tab:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

body.dark .nav-tab:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.nav-tab.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.page {
  display: none;
  animation: fadeIn 0.5s ease;
}

.page.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card {
  background: var(--card-light);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border-light);
  transition: all 0.3s ease;
}

body.dark .card {
  background: var(--card-dark);
  border-color: var(--border-dark);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

body.dark .card:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}

.summary-card {
  text-align: center;
  padding: 25px;
}

.summary-card h3 {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  opacity: 0.7;
  margin-bottom: 10px;
}

.summary-card .amount {
  font-size: 2rem;
  font-weight: bold;
  margin-bottom: 5px;
}

.income {
  color: var(--success);
}
.expense {
  color: var(--danger);
}
.balance {
  color: var(--primary);
}

.charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}

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

.chart-title {
  text-align: center;
  font-weight: 600;
  margin-bottom: 15px;
  font-size: 1.1rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 15px;
  margin-bottom: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group label {
  margin-bottom: 5px;
  font-weight: 500;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-control {
  padding: 12px;
  border: 2px solid var(--border-light);
  border-radius: 8px;
  background: var(--card-light);
  color: var(--text-light);
  font-size: 1rem;
  transition: all 0.3s ease;
}

body.dark .form-control {
  border-color: var(--border-dark);
  background: var(--card-dark);
  color: var(--text-dark);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.btn {
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: all 0.3s ease;
  font-size: 0.9rem;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

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

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

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

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

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

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

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

body.dark .btn-secondary {
  background: var(--border-dark);
  color: var(--text-dark);
}

.table-container {
  overflow-x: auto;
  border-radius: 8px;
  border: 1px solid var(--border-light);
}

body.dark .table-container {
  border-color: var(--border-dark);
}

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

th,
td {
  padding: 15px;
  text-align: left;
  border-bottom: 1px solid var(--border-light);
}

body.dark th,
body.dark td {
  border-color: var(--border-dark);
}

th {
  background: var(--border-light);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-size: 0.8rem;
}

body.dark th {
  background: var(--border-dark);
}

.actions {
  display: flex;
  gap: 8px;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8rem;
}

.filters {
  display: flex;
  gap: 15px;
  margin-bottom: 20px;
  flex-wrap: wrap;
  align-items: end;
}

.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: all 0.3s ease;
  z-index: 1000;
}

.theme-toggle:hover {
  background: var(--primary-hover);
  transform: scale(1.1);
}

.insight-box {
  background: linear-gradient(135deg, var(--info), var(--primary));
  color: white;
  padding: 20px;
  border-radius: 12px;
  margin: 20px 0;
}

.insight-box h3 {
  margin-bottom: 10px;
}

.empty-state {
  text-align: center;
  padding: 60px 20px;
  opacity: 0.6;
}

.empty-state h3 {
  margin-bottom: 10px;
  font-size: 1.5rem;
}

.badge {
  padding: 4px 8px;
  border-radius: 12px;
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
}

.badge-success {
  background: var(--success);
  color: white;
}

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

@media (max-width: 768px) {
  .container {
    padding: 10px;
  }

  .header h1 {
    font-size: 2rem;
  }

  .charts-grid {
    grid-template-columns: 1fr;
  }

  .chart-container {
    height: 250px;
  }

  .filters {
    flex-direction: column;
    align-items: stretch;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .theme-toggle {
    position: relative;
    top: 0;
    right: 0;
    margin: 10px auto;
  }
}