.hidden {
      display: none;
    }
    body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      margin: 2rem;
      background-color: #f9f9f9;
      color: #333;
    }
    h1 {
      text-align: center;
      color: #2c3e50;
    }
    .container {
      max-width: 95%;
      margin: auto;
      padding: 0 1rem;
    }
    .table-container {
      overflow-x: auto;
    }
    .table-actions {
      display: flex;
      justify-content: flex-start;
      align-items: center;
      gap: 10px;
      margin-bottom: 10px;
    }
    table {
      width: 100%;
      border-collapse: collapse;
      margin-top: 1rem;
      background-color: #fff;
      box-shadow: 0 2px 8px rgba(0,0,0,0.05);
      border-radius: 8px;
      overflow: hidden;
    }
    th, td {
      padding: 12px 16px;
      border-bottom: 1px solid #ddd;
      white-space: nowrap;
    }
    th {
      background-color: #2c3e50;
      color: white;
      cursor: grab;
    }
    th.drag-over {
      background-color: #444 !important;
    }
    .th-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .sort-indicator {
      font-size: 0.9em;
      opacity: 0.7;
      white-space: nowrap;
      margin-left: 8px;
    }
    .filter-input {
      width: 100%;
      padding: 6px 10px;
      box-sizing: border-box;
      margin-bottom: 6px;
      border: 1px solid #ccc;
      border-radius: 4px;
      transition: 0.2s;
    }
    .add-column-input {
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .remove-col-btn {
      background: red;
      color: white;
      border: none;
      border-radius: 4px;
      padding: 2px 6px;
      cursor: pointer;
      font-weight: bold;
      margin-right: 8px;
      font-size: 14px;
    }
    select {
      padding: 4px;
      font-size: 14px;
    }
    .add-col-btn {
      background: green;
      color: white;
      border: none;
      border-radius: 4px;
      padding: 4px 8px;
      cursor: pointer;
      font-weight: bold;
    }
    tr:nth-child(even) {
      background-color: #f9f9f9;
    }
    .loading {
      text-align: center;
      margin-top: 2rem;
      color: #666;
    }
    .footer-info {
      margin-top: 1rem;
      font-size: 0.9rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
    }
    .pagination {
      display: flex;
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .pagination li {
      margin: 0 4px;
    }
    .pagination li button {
      padding: 6px 12px;
      border: 1px solid #ccc;
      background-color: #f2f2f2;
      cursor: pointer;
      border-radius: 4px;
      transition: all 0.2s ease-in-out;
    }
    .action-btn {
      padding: 8px 16px;
      border: none;
      border-radius: 6px;
      font-size: 14px;
      font-weight: bold;
      color: white;
      background-color: #3498db;
      cursor: pointer;
      transition: background-color 0.3s ease, transform 0.1s ease;
    }
    .action-btn:hover {
      background-color: #2980b9;
      transform: translateY(-1px);
    }
    .save-btn {
      background-color: #2ecc71;
    }
    .save-btn:hover {
      background-color: #27ae60;
    }
    .save-btn:disabled {
      background-color: #bdc3c7;
      cursor: not-allowed;
    }
    tr.row-selected {
      background-color: #d0ebff !important;
    }
    @keyframes spin {
      0% { transform: rotate(0deg); }
      100% { transform: rotate(360deg); }
    }
    #spinner {
      position: fixed;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      z-index: 9999;
      background: rgba(0,0,0,0.7);
      padding: 20px;
      border-radius: 10px;
      color: white;
      text-align: center;
    }
    #spinner div {
      width: 40px;
      height: 40px;
      border: 4px solid #f3f3f3;
      border-top: 4px solid #3498db;
      border-radius: 50%;
      animation: spin 1s linear infinite;
      margin: auto;
    }
    .print-button {
      padding: 8px 16px;
      border: none;
      border-radius: 6px;
      font-size: 14px;
      font-weight: bold;
      color: white;
      background-color: #3498db;
      cursor: pointer;
      transition: background-color 0.3s ease, transform 0.1s ease;
    }
    @media print {
      .no-print {
        display: none !important;
      }
    }
    .modal {
      display: none;
      position: fixed;
      z-index: 9999;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      overflow: auto;
      background-color: rgba(0,0,0,0.4);
    }
    .modal-content {
      background-color: #fff;
      margin: 8% auto;
      padding: 2rem;
      border-radius: 8px;
      width: 90%;
      max-width: 600px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
      position: relative;
    }
    .modal-close {
      color: #aaa;
      float: right;
      font-size: 24px;
      font-weight: bold;
      cursor: pointer;
    }
    .modal-close:hover,
    .modal-close:focus {
      color: black;
      text-decoration: none;
      cursor: pointer;
    }
    .modal-footer {
      margin-top: 1rem;
      text-align: right;
    }
    .form-group {
      margin-bottom: 1rem;
    }
    .form-group label {
      display: block;
      font-weight: bold;
      margin-bottom: 0.5rem;
    }
    .form-group input {
      width: 100%;
      padding: 8px;
      box-sizing: border-box;
      border: 1px solid #ccc;
      border-radius: 4px;
      font-size: 14px;
    }
    .edited-cell {
      background-color: #ffeeba !important;
      transition: background-color 0.5s ease;
    }
    /* Delete Button */
    .delete-btn {
      background-color: #e74c3c;
      color: white;
      border: none;
      border-radius: 4px;
      padding: 4px 8px;
      cursor: pointer;
      font-size: 14px;
      transition: background-color 0.3s ease;
    }
    .delete-btn:hover {
      background-color: #c0392b;
    }
    .date-input {
      width: 100%;
      padding: 6px;
      box-sizing: border-box;
    }
    .no-select {
      user-select: none;
    }