@media (min-width: 360px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .header-content h1 {
    font-size: 1.75rem;
  }
  
  nav ul {
    gap: var(--spacing-lg);
  }
  
  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .page-header h2 {
    font-size: 2.5rem;
  }
  
  .card {
    padding: var(--spacing-xl);
  }
  
  .form-actions {
    flex-direction: row;
    justify-content: flex-start;
  }
  
  .currency-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  table {
    display: table;
  }
  
  thead {
    display: table-header-group;
  }
  
  tbody {
    display: table-row-group;
  }
  
  tr {
    display: table-row;
  }
  
  td, th {
    display: table-cell;
  }
  
  td::before {
    display: none;
  }
}

@media (min-width: 1024px) {
  .header-content {
    padding: 0 var(--spacing-xl);
  }
  
  main {
    padding: var(--spacing-xl) var(--spacing-xl);
  }
  
  .stats-grid {
    gap: var(--spacing-lg);
  }
  
  .stat-value {
    font-size: 2.5rem;
  }
  
  #trend-chart {
    height: 250px;
  }
  
  .currency-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 767px) {
  nav ul {
    flex-direction: column;
    gap: var(--spacing-xs);
  }
  
  .header-content {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }
  
  table {
    display: block;
  }
  
  thead {
    display: none;
  }
  
  tbody {
    display: block;
  }
  
  tr {
    display: block;
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
  }
  
  td {
    display: block;
    text-align: right;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-color);
  }
  
  td:last-child {
    border-bottom: none;
  }
  
  td::before {
    content: attr(data-label);
    float: left;
    font-weight: 600;
    color: var(--text-secondary);
  }
  
  .actions-cell {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
  }
  
  .actions-cell::before {
    display: none;
  }
  
  .form-actions {
    flex-direction: column;
  }
  
  .form-actions .btn {
    width: 100%;
  }
  
  .search-input-group {
    flex-direction: column;
  }
  
  .import-export-section {
    flex-direction: column;
  }
  
  .import-export-section .btn {
    width: 100%;
  }
}