body {
    font-family: 'Segoe UI', sans-serif;
    background-color: #f5f6fa;
    margin: 0;
    padding: 0;
}

.dashboard-header {
    background-color: #ffffff;
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.metric-cards {
    display: flex;
    gap: 20px;
    margin: 30px 40px;
}

.metric-card {
    flex: 1;
    background-color: #ffffff;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 20px 40px 40px 40px;
}

.chart-container {
    background-color: #ffffff;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

body {
    transition: background-color 0.3s, color 0.3s;
  }
  
  .dark-mode {
    background-color: #121212;
    color: #f0f0f0;
  }
  
  .dark-mode .dashboard-header,
  .dark-mode .metric-card,
  .dark-mode .chart-container {
    background-color: #1e1e1e;
    color: #ffffff;
  }
  
  .theme-toggle {
    position: fixed;
    top: 20px;
    right: 30px;
    padding: 8px 16px;
    border: none;
    background-color: #4a90e2;
    color: white;
    border-radius: 8px;
    cursor: pointer;
    z-index: 999;
  }