* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f5f5f5;
  color: #222;
}

.page-shell {
  max-width: 1500px;
  margin: 0 auto;
  padding: 20px;
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 16px;
}

.page-header h1 {
  margin: 0 0 4px;
  font-size: 28px;
}

.page-subtitle {
  margin: 0;
  color: #666;
}

.cart-summary-button {
  min-width: 190px;
  padding: 10px 14px;
  border: 1px solid #d0d0d0;
  border-radius: 6px;
  background: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  font: inherit;
}

.cart-summary-button strong {
  font-size: 18px;
}

.cart-icon {
  font-size: 20px;
}

.table-panel,
.cart-page-panel,
.checkout-panel {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 6px;
  padding: 16px;
}

.toolbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 180px;
  gap: 12px;
  margin-bottom: 16px;
}

.toolbar-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.toolbar-field label {
  font-size: 13px;
  color: #555;
}

.toolbar-field input,
.toolbar-field select,
.row-qty-input,
.cart-row-qty-input,
.checkout-form input,
.checkout-form select,
.checkout-form textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid #cfcfcf;
  border-radius: 4px;
  font: inherit;
}

.table-wrap {
  overflow-x: auto;
}

.catalog-table {
  width: 100%;
  border-collapse: collapse;
}

.catalog-table th,
.catalog-table td {
  padding: 10px 8px;
  border-bottom: 1px solid #e6e6e6;
  text-align: left;
  vertical-align: middle;
  font-size: 14px;
}

.catalog-table thead th {
  background: #fafafa;
  font-weight: 700;
  white-space: nowrap;
}

.catalog-table tbody tr:hover {
  background: #fcfcfc;
}

.sort-button {
  appearance: none;
  border: 0;
  background: transparent;
  font: inherit;
  font-weight: 700;
  padding: 0;
  cursor: pointer;
  color: inherit;
}

.sort-indicator {
  display: inline-block;
  min-width: 16px;
  margin-left: 4px;
  color: #b5b5b5;
  font-size: 12px;
  letter-spacing: -1px;
}

.image-cell {
  width: 74px;
}

.table-image {
  width: 48px;
  height: 48px;
  object-fit: contain;
  border: 1px solid #e5e5e5;
  border-radius: 4px;
  background: #fff;
}

.sku-cell {
  font-weight: 700;
  white-space: nowrap;
}

.upc-cell,
.price-cell,
.available-cell,
.line-total-cell {
  white-space: nowrap;
}

.name-cell {
  min-width: 280px;
}

.qty-cell {
  width: 90px;
}

.row-qty-input:focus,
.cart-row-qty-input:focus,
.toolbar-field input:focus,
.toolbar-field select:focus,
.checkout-form input:focus,
.checkout-form select:focus,
.checkout-form textarea:focus {
  outline: 2px solid #8bb8ea;
  outline-offset: 0;
  border-color: #8bb8ea;
}

.cart-page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.cart-page-header h2 {
  margin: 0;
}

.cart-page-actions,
.checkout-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.primary-button,
.secondary-button {
  padding: 9px 14px;
  border-radius: 4px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.primary-button {
  border: 0;
  background: #1976d2;
  color: #fff;
}

.secondary-button {
  border: 1px solid #d0d0d0;
  background: #fff;
  color: #222;
}

.danger-button {
  color: #b42318;
}

.cart-totals-panel,
.checkout-summary {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid #e6e6e6;
  max-width: 340px;
  margin-left: auto;
}

.summary-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 6px 0;
}

.checkout-form {
  margin-top: 24px;
  border-top: 1px solid #e6e6e6;
  padding-top: 18px;
}

.checkout-form h3 {
  margin-top: 0;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 16px;
}

.form-grid label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  color: #555;
}

.full-width {
  grid-column: 1 / -1;
}

.checkout-actions {
  margin-top: 18px;
}

.checkout-message {
  min-height: 20px;
  margin: 10px 0 0;
  color: #444;
}

.checkout-message.error {
  color: #b42318;
}

.checkout-message.success {
  color: #16794a;
}

.empty-state {
  padding: 18px 10px 4px;
  color: #666;
}

.hidden {
  display: none;
}

@media (max-width: 900px) {
  .page-header,
  .cart-page-header {
    flex-direction: column;
    align-items: stretch;
  }

  .toolbar,
  .form-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .page-shell {
    padding: 12px;
  }
}