@media (max-width: 768px) {
  .container {
    padding: 12px;
  }

  .header-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .header-bar h2 {
    font-size: 18px;
  }

  .header-bar > div {
    width: 100%;
    justify-content: flex-start;
  }

  .card {
    padding: 16px;
  }

  .card-title {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .white-body {
    padding: 16px;
  }

  .name-grid {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 8px;
  }

  .btn {
    padding: 10px 14px;
    font-size: 13px;
  }

  .filter-row {
    flex-direction: column;
    align-items: stretch;
  }

  .filter-row > * {
    width: 100%;
  }

  .input-wrapper {
    width: 100%;
  }

  .date-input, .select-input {
    width: 100%;
  }

  .table-wrap {
    border-radius: 8px;
  }

  table {
    font-size: 13px;
    min-width: 600px;
  }

  th, td {
    padding: 10px;
  }

  .chart-wrap {
    grid-template-columns: 1fr;
  }

  .chart-container {
    height: 200px;
  }

  .pagination-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .pagination-controls {
    justify-content: space-between;
  }

  .modal-box {
    padding: 18px;
    border-radius: 12px;
  }

  .config-tabs {
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
  }

  .config-tab {
    white-space: nowrap;
    padding: 10px 12px;
    font-size: 13px;
  }

  .checklist-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .form-row label {
    margin-bottom: 4px;
  }

  .class-avg-box {
    flex-direction: column;
    gap: 8px;
  }

  .log-item {
    flex-direction: column;
    gap: 6px;
  }

  .log-time {
    align-self: flex-end;
  }
}

@media (max-width: 480px) {
  .header-bar h2 {
    font-size: 16px;
  }

  .name-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .header-bar > div {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  .header-bar > div .btn {
    width: 100%;
  }

  .confirm-btns {
    flex-direction: column-reverse;
  }

  .confirm-btns .btn {
    width: 100%;
  }

  .pagination-controls {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 8px;
  }

  .page-input {
    width: 100%;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .chart-wrap {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media print {
  body {
    background: #fff;
  }

  .header-bar, .btn, .modal, .toast, .loading-overlay {
    display: none !important;
  }

  .card, .white-card, .log-card {
    box-shadow: none;
    border: 1px solid #ddd;
    page-break-inside: avoid;
  }

  .table-wrap {
    overflow: visible;
  }

  table {
    font-size: 12px;
  }
}