.kpkb-builder {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 24px;
    align-items: start;
    margin: 24px 0;
}
.kpkb-title {
    margin: 0 0 16px;
}
.kpkb-step {
    background: #f4f4f4;
    margin-bottom: 10px;
    border: 1px solid #e0e0e0;
}
.kpkb-step-header {
    width: 100%;
    border: 0;
    background: #eeeeee;
    padding: 14px 16px;
    font-weight: 700;
    text-align: left;
    cursor: pointer;
}
.kpkb-step-body {
    display: none;
    padding: 16px;
    background: #fff;
}
.kpkb-step-open .kpkb-step-body {
    display: block;
}
.kpkb-label {
    margin: 0 0 10px;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: .04em;
}
.kpkb-choice-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 14px;
}
.kpkb-choice {
    border: 1px solid #d3d3d3;
    background: #fff;
    padding: 10px 14px;
    min-width: 120px;
    cursor: pointer;
}
.kpkb-choice.is-selected {
    border-color: #d71920;
    box-shadow: inset 0 0 0 2px #d71920;
}
.kpkb-selected-summary {
    padding: 8px 0 14px;
    font-size: 14px;
}
.kpkb-summary-gap {
    display: inline-block;
    width: 24px;
}
.kpkb-tabs {
    display: flex;
    gap: 4px;
    overflow-x: auto;
    border-bottom: 1px solid #ddd;
    margin-bottom: 12px;
}
.kpkb-tab {
    border: 0;
    background: #f2f2f2;
    padding: 10px 14px;
    cursor: pointer;
    white-space: nowrap;
    font-weight: 600;
}
.kpkb-tab.is-active {
    background: #d71920;
    color: #fff;
}
.kpkb-panel {
    display: none;
}
.kpkb-panel.is-active {
    display: block;
}
.kpkb-table-wrap {
    overflow-x: auto;
}
.kpkb-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}
.kpkb-table th,
.kpkb-table td {
    border-bottom: 1px solid #e6e6e6;
    padding: 10px;
    text-align: left;
    vertical-align: middle;
}
.kpkb-table th {
    background: #f8f8f8;
    font-weight: 700;
}
.kpkb-sku {
    white-space: nowrap;
    font-family: monospace;
}
.kpkb-thumb {
    max-width: 54px;
    height: auto;
}
.kpkb-qty-control {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.kpkb-qty-control button {
    width: 28px;
    height: 28px;
    border: 1px solid #ccc;
    background: #fff;
    cursor: pointer;
}
.kpkb-qty {
    width: 54px;
    height: 28px;
    text-align: center;
}
.kpkb-button {
    display: inline-block;
    border: 0;
    background: #d71920;
    color: #fff !important;
    padding: 10px 16px;
    margin-top: 12px;
    text-decoration: none;
    cursor: pointer;
    font-weight: 700;
}
.kpkb-basket {
    position: sticky;
    top: 24px;
    border: 1px solid #e3e3e3;
    background: #fff;
    padding: 16px;
}
.kpkb-basket h3 {
    margin-top: 0;
}
.kpkb-cart-message {
    min-height: 50px;
    padding: 10px;
    background: #f7f7f7;
}
.kpkb-cart-message.is-error {
    background: #fff1f1;
    color: #a60000;
}
.kpkb-cart-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.kpkb-loading,
.kpkb-empty,
.kpkb-error {
    padding: 18px;
    background: #f7f7f7;
}
.kpkb-error {
    color: #a60000;
}
@media (max-width: 900px) {
    .kpkb-builder {
        grid-template-columns: 1fr;
    }
    .kpkb-basket {
        position: static;
    }
}


.kpkb-icon-heading,
.kpkb-icon-cell {
    width: 64px;
    text-align: center !important;
}
.kpkb-unit-icon {
    display: block;
    width: 46px;
    height: 46px;
    object-fit: contain;
    margin: 0 auto;
}

.kpkb-product-link {
    color: inherit;
    font-weight: 600;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.kpkb-product-link:hover,
.kpkb-product-link:focus {
    text-decoration-thickness: 2px;
}


/* v0.5: make product detail links and unit type easier to see */
.kpkb-product-link {
    color: #7a1038;
    text-decoration: underline;
    font-weight: 600;
}
.kpkb-product-link:hover {
    color: #b20f47;
    text-decoration-thickness: 2px;
}
.kpkb-unit-type {
    font-size: 12px;
    color: #555;
    white-space: nowrap;
}
.kpkb-icon-cell {
    text-align: center;
}

/* v0.6 supplier-style parent tabs and sub-tabs */
.kpkb-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 1px solid #e6e6e6;
  background: #eee;
  margin-top: 10px;
}
.kpkb-main-tab {
  border: 0;
  background: transparent;
  padding: 12px 18px;
  font-weight: 700;
  text-transform: uppercase;
  color: #666;
  cursor: pointer;
}
.kpkb-main-tab.is-active {
  background: #fff;
  color: #333;
}
.kpkb-subtabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  background: #fff;
  border-bottom: 1px solid #e6e6e6;
  margin-bottom: 10px;
}
.kpkb-subtab {
  border: 0;
  background: #fff;
  padding: 10px 18px;
  color: #8a6472;
  cursor: pointer;
  font-size: 14px;
}
.kpkb-subtab.is-active {
  color: #c4002f;
  font-weight: 600;
}

/* v0.8 Preston & Co styling */
:root {
  --kpkb-brand-purple: #602068;
  --kpkb-brand-purple-dark: #4b1653;
  --kpkb-hover-bg: #eeeeee;
  --kpkb-hover-text: #111111;
  --kpkb-border: #d8d8d8;
}

.kpkb-builder {
  color: #222;
}

.kpkb-step-header {
  background: #eeeeee !important;
  color: #333333 !important;
}

.kpkb-choice,
.kpkb-main-tab,
.kpkb-subtab,
.kpkb-tab,
.kpkb-qty-control button {
  background: #ffffff !important;
  color: #333333 !important;
  border: 1px solid var(--kpkb-border) !important;
}

.kpkb-choice:hover,
.kpkb-main-tab:hover,
.kpkb-subtab:hover,
.kpkb-tab:hover,
.kpkb-qty-control button:hover {
  background: var(--kpkb-hover-bg) !important;
  color: var(--kpkb-hover-text) !important;
  border-color: #bdbdbd !important;
}

.kpkb-choice.is-selected,
.kpkb-main-tab.is-active,
.kpkb-subtab.is-active,
.kpkb-tab.is-active {
  background: var(--kpkb-brand-purple) !important;
  color: #ffffff !important;
  border-color: var(--kpkb-brand-purple) !important;
  box-shadow: none !important;
}

.kpkb-choice.is-selected:hover,
.kpkb-main-tab.is-active:hover,
.kpkb-subtab.is-active:hover,
.kpkb-tab.is-active:hover {
  background: var(--kpkb-brand-purple-dark) !important;
  color: #ffffff !important;
  border-color: var(--kpkb-brand-purple-dark) !important;
}

.kpkb-button,
.kpkb-add-selected,
.kpkb-view-cart,
.kpkb-checkout {
  background: var(--kpkb-brand-purple) !important;
  color: #ffffff !important;
  border: 1px solid var(--kpkb-brand-purple) !important;
}

.kpkb-button:hover,
.kpkb-add-selected:hover,
.kpkb-view-cart:hover,
.kpkb-checkout:hover {
  background: var(--kpkb-hover-bg) !important;
  color: var(--kpkb-hover-text) !important;
  border-color: #bdbdbd !important;
}

.kpkb-product-link {
  color: var(--kpkb-brand-purple) !important;
}

.kpkb-product-link:hover {
  color: var(--kpkb-brand-purple-dark) !important;
}

.kpkb-tabs {
  background: #eeeeee !important;
}

.kpkb-subtabs {
  background: #ffffff !important;
}

.kpkb-table th {
  background: #f3f3f3 !important;
  color: #222222 !important;
}


/* v0.9 compact and mobile-friendly tab/table styling */
.kpkb-builder {
  gap: 16px;
}

.kpkb-tabs {
  flex-wrap: nowrap !important;
  overflow-x: auto !important;
  overflow-y: hidden !important;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  padding: 0 0 2px 0;
}

.kpkb-main-tab {
  flex: 0 0 auto;
  padding: 10px 14px !important;
  font-size: 14px !important;
  line-height: 1.2 !important;
  letter-spacing: .01em;
  min-height: 44px;
}

.kpkb-subtabs {
  flex-wrap: nowrap !important;
  overflow-x: auto !important;
  overflow-y: hidden !important;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  gap: 4px;
  padding-bottom: 4px;
}

.kpkb-subtab {
  flex: 0 0 auto;
  padding: 9px 12px !important;
  font-size: 13px !important;
  line-height: 1.2 !important;
  min-height: 40px;
}

.kpkb-step-header {
  padding: 11px 14px !important;
  font-size: 14px;
}

.kpkb-step-body {
  padding: 12px !important;
}

.kpkb-table {
  font-size: 13px !important;
}

.kpkb-table th,
.kpkb-table td {
  padding: 7px 8px !important;
}

.kpkb-icon-heading,
.kpkb-icon-cell {
  width: 42px !important;
  min-width: 42px !important;
}

.kpkb-unit-icon {
  width: 32px !important;
  height: 32px !important;
}

.kpkb-unit-type {
  font-size: 11px !important;
}

.kpkb-sku {
  font-size: 11px !important;
}

.kpkb-product-link {
  font-size: 13px !important;
  line-height: 1.25;
}

.kpkb-qty-control button {
  width: 24px !important;
  height: 24px !important;
  padding: 0 !important;
  line-height: 1 !important;
}

.kpkb-qty {
  width: 42px !important;
  height: 24px !important;
  font-size: 12px !important;
}

.kpkb-button {
  padding: 9px 13px !important;
  font-size: 13px !important;
}

@media (max-width: 1100px) {
  .kpkb-builder {
    grid-template-columns: minmax(0, 1fr) 220px;
    gap: 14px;
  }
  .kpkb-main-tab {
    font-size: 13px !important;
    padding: 9px 12px !important;
  }
  .kpkb-subtab {
    font-size: 12px !important;
    padding: 8px 10px !important;
  }
}

@media (max-width: 900px) {
  .kpkb-builder {
    display: block !important;
  }
  .kpkb-basket {
    position: static !important;
    margin-top: 16px;
  }
}

@media (max-width: 640px) {
  .kpkb-builder {
    margin: 12px 0;
  }
  .kpkb-title {
    font-size: 20px;
  }
  .kpkb-choice-row {
    gap: 6px;
  }
  .kpkb-choice {
    min-width: 0 !important;
    padding: 8px 10px !important;
    font-size: 12px !important;
  }
  .kpkb-main-tab {
    font-size: 12px !important;
    padding: 8px 10px !important;
    min-height: 38px;
  }
  .kpkb-subtab {
    font-size: 12px !important;
    padding: 8px 10px !important;
    min-height: 36px;
  }
  .kpkb-table-wrap {
    overflow-x: auto !important;
    -webkit-overflow-scrolling: touch;
  }
  .kpkb-table {
    min-width: 720px;
    font-size: 12px !important;
  }
  .kpkb-table th,
  .kpkb-table td {
    padding: 6px !important;
  }
  .kpkb-unit-icon {
    width: 28px !important;
    height: 28px !important;
  }
  .kpkb-basket {
    padding: 12px;
  }
  .kpkb-cart-actions {
    display: grid !important;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }
}

/* Product detail modal: keeps customers in the builder */
.kpkb-modal {
    display: none;
    position: fixed;
    z-index: 999999;
    inset: 0;
}

.kpkb-modal.is-open {
    display: block;
}

.kpkb-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
}

.kpkb-modal-dialog {
    position: relative;
    width: min(860px, calc(100vw - 28px));
    max-height: calc(100vh - 48px);
    overflow: auto;
    margin: 24px auto;
    background: #fff;
    border-radius: 6px;
    box-shadow: 0 14px 44px rgba(0, 0, 0, 0.25);
}

.kpkb-modal-close {
    position: sticky;
    top: 8px;
    float: right;
    width: 34px;
    height: 34px;
    margin: 10px 10px 0 0;
    border: 0 !important;
    background: #5b1b68 !important;
    color: #fff !important;
    font-size: 24px;
    line-height: 1;
    border-radius: 50%;
    z-index: 2;
}

.kpkb-modal-content {
    clear: both;
    padding: 18px 22px 24px;
}

.kpkb-product-modal-body {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 22px;
    align-items: start;
}

.kpkb-modal-image img {
    max-width: 100%;
    height: auto;
    border: 1px solid #e2e2e2;
    border-radius: 4px;
}

.kpkb-modal-details h3 {
    margin: 0 0 10px;
    color: #1f1f1f;
    font-size: 22px;
}

.kpkb-modal-sku,
.kpkb-modal-price {
    margin: 6px 0;
}

.kpkb-modal-description,
.kpkb-modal-more {
    margin-top: 14px;
}

.kpkb-modal-more summary {
    cursor: pointer;
    font-weight: 700;
    color: #5b1b68;
}

.kpkb-modal-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}

.kpkb-secondary-button {
    background: #eeeeee !important;
    color: #222 !important;
    border-color: #d5d5d5 !important;
}

.kpkb-secondary-button:hover {
    background: #e0e0e0 !important;
    color: #111 !important;
}

.kpkb-product-link {
    color: #5b1b68;
    text-decoration: underline;
    font-weight: 600;
}

.kpkb-product-link:hover {
    color: #222;
}

@media (max-width: 640px) {
    .kpkb-modal-dialog {
        width: calc(100vw - 18px);
        margin: 9px auto;
        max-height: calc(100vh - 18px);
    }

    .kpkb-product-modal-body {
        grid-template-columns: 1fr;
    }

    .kpkb-modal-content {
        padding: 14px;
    }
}

/* v1.1 popup image gallery */
.kpkb-modal-gallery {
    max-width: 260px;
}

.kpkb-modal-main-image img {
    max-width: 100%;
    height: auto;
    border: 1px solid #e2e2e2;
    border-radius: 4px;
    background: #fff;
}

.kpkb-modal-thumbs {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 8px;
}

.kpkb-modal-thumb {
    width: 46px;
    height: 46px;
    padding: 2px;
    border: 1px solid #d5d5d5 !important;
    background: #fff !important;
    border-radius: 4px;
    cursor: pointer;
}

.kpkb-modal-thumb.is-active,
.kpkb-modal-thumb:hover {
    border-color: #5b1b68 !important;
    background: #f4edf6 !important;
}

.kpkb-modal-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.kpkb-modal-no-image {
    border: 1px dashed #d5d5d5;
    border-radius: 4px;
    padding: 18px;
    color: #666;
    background: #fafafa;
}

@media (max-width: 640px) {
    .kpkb-modal-gallery {
        max-width: 100%;
    }
}


/* Product page return link */
.kpkb-back-to-builder {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin: 0 0 14px 0;
    padding: 9px 14px;
    background: #5b1b6d;
    color: #fff !important;
    border-radius: 4px;
    text-decoration: none !important;
    font-weight: 700;
    line-height: 1.2;
}
.kpkb-back-to-builder:hover,
.kpkb-back-to-builder:focus {
    background: #eeeeee;
    color: #111 !important;
}

/* v1.4 installer planning guide modal */
.kpkb-planning-guide-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin: 6px 0 12px;
}
.kpkb-planning-guide-note {
    font-size: 12px;
    color: #666;
}
.kpkb-planning-guide {
    margin-top: 0 !important;
}
.kpkb-planning-modal h3 {
    margin: 0 0 6px;
    color: #222;
}
.kpkb-planning-heading p {
    margin: 0 0 16px;
    color: #555;
}
.kpkb-planning-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
}
.kpkb-planning-card {
    margin: 0;
    border: 1px solid #e1e1e1;
    border-radius: 6px;
    background: #fff;
    overflow: hidden;
}
.kpkb-planning-card figcaption {
    padding: 10px 12px;
    font-weight: 700;
    background: #f4f4f4;
    color: #222;
}
.kpkb-planning-card a {
    display: block;
    padding: 10px;
    background: #fff;
}
.kpkb-planning-card img {
    display: block;
    width: 100%;
    height: auto;
    max-height: 72vh;
    object-fit: contain;
}
@media (max-width: 640px) {
    .kpkb-planning-guide-row {
        align-items: stretch;
    }
    .kpkb-planning-guide {
        width: 100%;
        text-align: center;
    }
    .kpkb-planning-card img {
        max-height: none;
    }
}

/* v1.6 safety fixes: show first step even if JavaScript is delayed/cached */
.kpkb-builder .kpkb-step[data-step="cabinet"] .kpkb-step-body {
    display: block;
}
.kpkb-builder .kpkb-step.kpkb-step-open .kpkb-step-body {
    display: block;
}
.kpkb-builder .kpkb-choice-row:empty::after {
    content: "Loading choices...";
    color: #555;
    font-size: 13px;
}