:root {
    --primary: #2563eb;
    --primary-light: #3b82f6;
    --primary-dark: #1e40af;
    --secondary: #f0f9ff;
    --text-dark: #1e293b;
    --text-light: #f8fafc;
    --border-color: #e2e8f0;
    --sidebar-width: 250px;
    --sidebar-collapsed-width: 60px;
    --header-height: 60px;
  }
  
  body {
    background-color: #f8fafc;
    color: var(--text-dark);
    overflow-x: hidden;
  }
  
  /* Sidebar Styles */
  .sidebar {
    width: var(--sidebar-width);
    background: white;
    height: 100vh;
    position: fixed;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
    transition: width 0.3s ease;
    z-index: 100;
    overflow-y: auto;
    overflow-x: hidden;
  }
  
  .sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
  }
  
  .logo-container {
    display: flex;
    align-items: center;
    padding: 20px;
    height: var(--header-height);
    border-bottom: 1px solid var(--border-color);
  }
  
  .logo-icon {
    font-size: 24px;
    color: var(--primary);
    width: 32px;
    min-width: 32px;
  }
  
  .logo-text {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
    margin-left: 10px;
    white-space: nowrap;
    opacity: 1;
    transition: opacity 0.3s;
  }
  
  .sidebar.collapsed .logo-text {
    opacity: 0;
    width: 0;
  }
  
  .sidebar-menu {
    padding: 10px;
    list-style-type: none;
  }
  
  .menu-item {
    margin-bottom: 5px;
    border-radius: 6px;
    transition: all 0.3s;
  }
  
  .menu-item.active {
    background: var(--secondary);
  }
  
  .menu-item.active .menu-link {
    color: var(--primary);
  }
  
  .menu-link {
    display: flex;
    align-items: center;
    padding: 12px 15px;
    color: var(--text-dark);
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.3s;
    overflow: hidden;
  }
  
  .menu-link:hover {
    background: var(--secondary);
    color: var(--primary);
  }
  
  .menu-icon {
    font-size: 18px;
    min-width: 24px;
    text-align: center;
  }
  
  .menu-text {
    margin-left: 10px;
    white-space: nowrap;
    opacity: 1;
    transition: opacity 0.3s;
  }
  
  .sidebar.collapsed .menu-text {
    opacity: 0;
    width: 0;
  }
  
  .sidebar-footer {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 15px;
    border-top: 1px solid var(--border-color);
    text-align: center;
  }
  
  .collapse-btn {
    background: none;
    border: none;
    color: var(--primary);
    font-size: 18px;
    cursor: pointer;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
  }
  
  .collapse-text {
    opacity: 1;
    transition: opacity 0.3s;
  }
  
  .sidebar.collapsed .collapse-text {
    opacity: 0;
    width: 0;
  }
  
  /* Main Content Styles */
  .main-content {
    margin-left: var(--sidebar-width);
    transition: margin-left 0.3s ease;
  }
  
  .sidebar.collapsed + .main-content {
    margin-left: var(--sidebar-collapsed-width);
  }

  /* Chart containers */
  .chart-container {
    position: relative;
    height: 300px;
    width: 100%;
    background-color: #f9f9f9;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .chart-placeholder {
    text-align: center;
    color: #64748b;
  }
  
  .chart-placeholder i {
    font-size: 48px;
    color: #cbd5e1;
    margin-bottom: 10px;
  }
  
  /* Feature Section Styles */
  .feature-section {
    display: none;
  }

  .feature-section.active {
    display: block;
  }

  /* Responsive Styles */
  @media (max-width: 768px) {
    .sidebar {
      transform: translateX(-100%);
      z-index: 1030;
    }
    
    .sidebar.show {
      transform: translateX(0);
    }
    
    .main-content {
      margin-left: 0 !important;
    }
  }
  
  /* Custom card styles */
  .feature-card {
    transition: transform 0.3s, box-shadow 0.3s;
  }
  
  .feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1) !important;
  }
  
  .card-icon {
    background: var(--secondary);
    color: var(--primary);
    width: 50px;
    height: 50px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
  }
  
  .activity-icon {
    background: var(--secondary);
    color: var(--primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 15px;
  }

  /* Feature placeholder styles */
  .feature-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    text-align: center;
  }

  .feature-icon {
    font-size: 48px;
    color: var(--primary);
    margin-bottom: 20px;
  }
  
  /* Avatar styles */
  .avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
  }