/* Modern CSS Variables */
:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: #0dcaf0;
    --dark-color: #212529;
    --light-color: #f8f9fa;
    --white: #ffffff;
    
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-success: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    --gradient-warning: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-info: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
    
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }
  
  /* Base Styles */
  * {
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    margin: 0;
    line-height: 1.6;
  }
  
  /* Navigation */
  .main-nav {
    background: var(--white);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1030;
    border-bottom: 1px solid #e9ecef;
  }
  
  .nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
  }
  
  .logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
  }
  
  .logo:hover {
    color: var(--primary-color);
    transform: scale(1.05);
  }
  
  .nav-links {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 0.5rem;
  }
  
  .nav-links li a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    color: var(--dark-color);
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: var(--transition);
    font-weight: 500;
  }
  
  .nav-links li a:hover,
  .nav-links li a.active {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
  }
  
  .nav-links li a.logout:hover {
    background: var(--danger-color);
  }
  
  /* Burger Menu */
  .burger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
  }
  
  .burger div {
    width: 25px;
    height: 3px;
    background: var(--dark-color);
    border-radius: 2px;
    transition: var(--transition);
  }
  
  /* Main Content */
  .main-content {
    padding: 2rem 0;
    min-height: calc(100vh - 140px);
  }
  
  .page-header {
    margin-bottom: 2rem;
  }
  
  .page-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--dark-color);
  }
  
  .page-header p {
    font-size: 1.1rem;
    margin: 0;
  }
  
  /* Stats Cards */
  .stat-card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    border: 1px solid #e9ecef;
    display: flex;
    align-items: center;
    gap: 1rem;
    position: relative;
    overflow: hidden;
  }
  
  .stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
  }
  
  .stat-card.total::before { background: var(--gradient-primary); }
  .stat-card.pending::before { background: var(--gradient-info); }
  .stat-card.delayed::before { background: var(--gradient-warning); }
  .stat-card.cancelled::before { background: var(--gradient-warning); }
  
  .stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--white);
  }
  
  .stat-icon.total { background: var(--gradient-primary); }
  .stat-icon.pending { background: var(--gradient-info); }
  .stat-icon.delayed { background: var(--gradient-warning); }
  .stat-icon.cancelled { background: var(--gradient-warning); }
  
  .stat-content h3 {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0;
    color: var(--dark-color);
  }
  
  .stat-content p {
    margin: 0;
    color: var(--secondary-color);
    font-weight: 500;
  }
  
  /* Card Hover Effect */
  .card-hover {
    transition: var(--transition);
  }
  
  .card-hover:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
  }
  
  /* Chart Cards */
  .chart-card {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    border: 1px solid #e9ecef;
    overflow: hidden;
  }
  
  .chart-header {
    padding: 1.5rem 1.5rem 0.5rem;
    border-bottom: 1px solid #e9ecef;
  }
  
  .chart-header h5 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0 0 0.5rem;
    color: var(--dark-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }
  
  .chart-header p {
    margin: 0;
    font-size: 0.9rem;
  }
  
  .chart-body {
    padding: 1.5rem;
    height: 300px;
  }
  
  /* Table Card */
  .table-card {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    border: 1px solid #e9ecef;
    overflow: hidden;
  }
  
  .table-header {
    padding: 1.5rem;
    border-bottom: 1px solid #e9ecef;
    display: flex;
    justify-content: between;
    align-items: center;
    gap: 1rem;
  }
  
  .table-header h5 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
    color: var(--dark-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
  }
  
  .table-actions {
    flex-shrink: 0;
  }
  
  .table-actions .input-group {
    width: 300px;
  }
  
  /* Table Styles */
  .table {
    margin: 0;
  }
  
  .table th {
    background: var(--light-color);
    font-weight: 600;
    color: var(--dark-color);
    border-bottom: 2px solid #dee2e6;
    padding: 1rem;
  }
  
  .table th i {
    margin-right: 0.5rem;
    color: var(--primary-color);
  }
  
  .table td {
    padding: 1rem;
    vertical-align: middle;
    border-bottom: 1px solid #e9ecef;
  }
  
  .table tbody tr {
    transition: var(--transition);
  }
  
  .table tbody tr:hover {
    background: #f8f9fa;
    transform: scale(1.01);
  }
  
  .table tbody tr:hover .actions {
    opacity: 1;
  }
  
  .actions {
    opacity: 0.3;
    transition: var(--transition);
    display: flex;
    gap: 0.5rem;
  }
  
  /* Status Badges */
  .badge {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.5rem 0.75rem;
    border-radius: 20px;
  }
  
  /* Empty State */
  .empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--secondary-color);
  }
  
  .empty-icon {
    font-size: 4rem;
    color: #dee2e6;
    margin-bottom: 1rem;
  }
  
  .empty-state h4 {
    color: var(--dark-color);
    margin-bottom: 0.5rem;
  }
  
  .empty-state p {
    margin-bottom: 1.5rem;
  }
  
  /* Footer */
  .footer {
    background: var(--white);
    border-top: 1px solid #e9ecef;
    padding: 1rem 0;
    margin-top: 2rem;
  }
  
  .footer p {
    margin: 0;
    color: var(--secondary-color);
    font-size: 0.9rem;
  }
  
  .footer a {
    color: var(--primary-color);
  }
  
  /* Modal Enhancements */
  .modal-content {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
  }
  
  .modal-header {
    background: var(--light-color);
    border-bottom: 1px solid #e9ecef;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
  }
  
  .modal-title {
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }
  
  .modal-body {
    padding: 2rem;
  }
  
  .form-label {
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
  }
  
  .input-group-text {
    background: var(--light-color);
    border: 1px solid #ced4da;
    color: var(--primary-color);
  }
  
  .form-control,
  .form-select {
    border: 1px solid #ced4da;
    border-radius: 8px;
    padding: 0.75rem;
    transition: var(--transition);
  }
  
  .form-control:focus,
  .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
  }
  
  .qty-control {
    max-width: 200px;
  }
  
  .qty-control .form-control {
    font-weight: 600;
    font-size: 1.1rem;
  }
  
  /* Button Enhancements */
  .btn {
    border-radius: 8px;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
  }
  
  .btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
  }
  
  .btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
  }
  
  .btn:hover {
    transform: translateY(-2px);
  }
  
  .btn-primary {
    background: var(--gradient-primary);
    border: none;
  }
  
  .btn-success {
    background: var(--gradient-success);
    border: none;
  }
  
  .btn-danger {
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a52 100%);
    border: none;
  }
  
  /* Responsive Design */
  @media (max-width: 768px) {
    .nav-links {
      position: fixed;
      top: 70px;
      right: -100%;
      background: var(--white);
      flex-direction: column;
      width: 100%;
      padding: 2rem;
      box-shadow: var(--shadow-lg);
      transition: var(--transition);
    }
    
    .nav-links.active {
      right: 0;
    }
    
    .burger {
      display: flex;
    }
    
    .burger.active .line1 {
      transform: rotate(-45deg) translate(-5px, 6px);
    }
    
    .burger.active .line2 {
      opacity: 0;
    }
    
    .burger.active .line3 {
      transform: rotate(45deg) translate(-5px, -6px);
    }
    
    .page-header h1 {
      font-size: 2rem;
    }
    
    .table-actions .input-group {
      width: 100%;
    }
    
    .table-header {
      flex-direction: column;
      align-items: stretch;
    }
    
    .chart-body {
      height: 250px;
    }
    
    .stat-card {
      text-align: center;
      flex-direction: column;
    }
  }
  
  @media (max-width: 576px) {
    .main-content {
      padding: 1rem 0;
    }
    
    .container-fluid {
      padding: 0 1rem;
    }
    
    .table-responsive {
      font-size: 0.9rem;
    }
    
    .modal-dialog {
      margin: 1rem;
    }
    
    .modal-body {
      padding: 1rem;
    }
  }