/* -----------------------------------------------------------------------
     Resin Calculator — Scoped Styles
     All selectors prefixed with .rc-calculator to avoid theme conflicts.
     ----------------------------------------------------------------------- */
  .rc-calculator {
    max-width: var(--page-width, 1200px);
    margin: 1rem auto 3rem;
    padding: 0 1.5rem;
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #1a1a1a;
    font-size: 16px;
  }

  .rc-calculator *,
  .rc-calculator *::before,
  .rc-calculator *::after {
    box-sizing: border-box;
  }

  /* Header removed — title provided by Shopify page */

  /* -----------------------------------------------------------------------
     Calculator type cards (first step)
     ----------------------------------------------------------------------- */
  .rc-calculator .calc-type-selector {
    margin-bottom: 1.5rem;
  }

  .rc-calculator .calc-type-heading {
    font-weight: 700;
    font-size: 1.4rem;
    margin-bottom: 0.75rem;
    color: #145da0;
  }

  .rc-calculator .calc-type-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
  }

  .rc-calculator .calc-type-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
    padding: 1rem 0.75rem;
    border: 2px solid #ddd;
    border-radius: 12px;
    background: #fff;
    cursor: pointer;
    text-align: center;
    transition: border-color 0.2s, background 0.2s, box-shadow 0.2s;
  }

  .rc-calculator .calc-type-card:hover {
    border-color: #bbb;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  }

  .rc-calculator .calc-type-card.selected {
    border-color: #145da0;
    background: rgba(20, 93, 160, 0.08);
    box-shadow: 0 2px 8px rgba(20, 93, 160, 0.15);
  }

  .rc-calculator .calc-type-icon {
    font-size: 1.8rem;
    line-height: 1;
  }

  .rc-calculator .calc-type-label {
    font-weight: 700;
    font-size: 1.2rem;
    color: #333;
  }

  .rc-calculator .calc-type-desc {
    font-size: 1.05rem;
    color: #777;
    line-height: 1.3;
  }

  /* -----------------------------------------------------------------------
     Resin options — card selectors
     ----------------------------------------------------------------------- */
  .rc-calculator .resin-options {
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 1.25rem 1.5rem;
    margin-bottom: 2rem;
  }

  .rc-calculator .resin-option-heading {
    font-weight: 600;
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
  }

  .rc-calculator .resin-option-heading + .card-row {
    margin-bottom: 1rem;
  }

  .rc-calculator .card-row {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
  }

  .rc-calculator .resin-card {
    flex: 1;
    min-width: 140px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
    border: 2px solid #ddd;
    border-radius: 8px;
    background: #fff;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s, box-shadow 0.2s;
  }

  .rc-calculator .resin-card:hover {
    border-color: #bbb;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  }

  .rc-calculator .resin-card.selected {
    border-color: #145da0;
    background: rgba(20, 93, 160, 0.08);
  }

  .rc-calculator .resin-card-image {
    width: 80px;
    height: 80px;
    object-fit: contain;
    border-radius: 4px;
  }

  .rc-calculator .resin-card-placeholder {
    background: #f0f0f0;
    border: 1px dashed #ccc;
  }

  .rc-calculator .resin-card-label {
    font-weight: 600;
    font-size: 1.25rem;
    text-align: center;
    color: #333;
  }

  .rc-calculator .cure-speed-card {
    flex: 1;
    min-width: 160px;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    border: 2px solid #ddd;
    border-radius: 8px;
    background: #fff;
    cursor: pointer;
    overflow: hidden;
    transition: border-color 0.2s, background 0.2s, box-shadow 0.2s;
  }

  .rc-calculator .cure-speed-card:hover {
    border-color: #bbb;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  }

  .rc-calculator .cure-speed-stripe {
    height: 4px;
    width: 100%;
    border-radius: 6px 6px 0 0;
  }

  .rc-calculator .cure-speed-label {
    font-weight: 600;
    font-size: 1.2rem;
    padding: 0.5rem 0.75rem 0;
    color: #333;
  }

  .rc-calculator .cure-speed-desc {
    font-size: 1.12rem;
    color: #777;
    padding: 0 0.75rem 0.6rem;
    line-height: 1.4;
  }

  /* -----------------------------------------------------------------------
     Kleer Kote product card (tabletop only)
     ----------------------------------------------------------------------- */
  .rc-calculator .kleer-kote-section {
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 1.25rem 1.5rem;
    margin-bottom: 2rem;
  }

  .rc-calculator .kleer-kote-heading {
    font-weight: 600;
    font-size: 1.3rem;
    margin-bottom: 0.75rem;
  }

  .rc-calculator .kleer-kote-product {
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }

  .rc-calculator .kleer-kote-image {
    width: 80px;
    height: 80px;
    object-fit: contain;
    border-radius: 4px;
  }

  .rc-calculator .kleer-kote-placeholder {
    background: #f0f0f0;
    border: 1px dashed #ccc;
    width: 80px;
    height: 80px;
    border-radius: 4px;
  }

  .rc-calculator .kleer-kote-name {
    font-weight: 600;
    font-size: 1.2rem;
    color: #333;
  }

  /* -----------------------------------------------------------------------
     Fabric type cards
     ----------------------------------------------------------------------- */
  .rc-calculator .fabric-selector {
    margin-bottom: 0.5rem;
  }

  .rc-calculator .fabric-option-heading {
    font-weight: 600;
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
  }

  .rc-calculator .fabric-card {
    flex: 1 1 calc(25% - 0.75rem);
    min-width: 100px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    padding: 0.6rem;
    border: 2px solid #ddd;
    border-radius: 8px;
    background: #fff;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s, box-shadow 0.2s;
  }

  .rc-calculator .fabric-card:hover {
    border-color: #bbb;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  }

  .rc-calculator .fabric-card.selected {
    border-color: #145da0;
    background: rgba(20, 93, 160, 0.08);
  }

  .rc-calculator .fabric-card-image {
    width: 72px;
    height: 72px;
    object-fit: contain;
    border-radius: 4px;
  }

  .rc-calculator .fabric-card-placeholder {
    background: #f0f0f0;
    border: 1px dashed #ccc;
  }

  .rc-calculator .fabric-card-label {
    font-weight: 600;
    font-size: 1.12rem;
    text-align: center;
    color: #333;
    line-height: 1.3;
  }

  /* Calculator panels */
  .rc-calculator .calc-panel { display: none; }
  .rc-calculator .calc-panel.active { display: block; }
  .rc-calculator .calc-panel h3 { font-size: 1.4rem; margin: 0 0 0.75rem; color: #145da0; }

  /* Forms */
  .rc-calculator form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
  }

  .rc-calculator label {
    display: flex;
    flex-direction: column;
    font-weight: 600;
    font-size: 1.3rem;
  }

  .rc-calculator input[type='number'],
  .rc-calculator select {
    margin-top: 0.4rem;
    padding: 0.75rem 1rem;
    font-family: inherit;
    font-size: 1.3rem;
    border: 1px solid #ccc;
    border-radius: 25px;
    width: 100%;
    background: #fff;
  }

  .rc-calculator input[type='number']:focus,
  .rc-calculator select:focus {
    outline: none;
    border-color: #145da0;
    box-shadow: 0 0 0 2px rgba(20, 93, 160, 0.2);
  }

  .rc-calculator .hint {
    font-weight: 400;
    color: #777;
    font-size: 1.15rem;
    margin-top: 0.3rem;
    display: block;
  }

  .rc-calculator .checkbox-label {
    flex-direction: row;
    align-items: flex-start;
    gap: 0.5rem;
    font-weight: 400;
  }

  .rc-calculator .checkbox-label input[type='checkbox'] {
    margin-top: 0.3rem;
    width: auto;
    flex-shrink: 0;
  }

  .rc-calculator .checkbox-label span { font-weight: 600; font-size: 1.3rem; }
  .rc-calculator .checkbox-label .hint { font-weight: 400; }

  .rc-calculator button[type='submit'] {
    padding: 1rem;
    background: #ff810f;
    color: #fff;
    font-family: inherit;
    font-size: 1.4rem;
    font-weight: 700;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    transition: background 0.2s;
    margin-top: 0.5rem;
    letter-spacing: 0.02em;
  }

  .rc-calculator button[type='submit']:hover { background: #e06d00; }

  .rc-calculator .hidden { display: none !important; }

  /* Two-column layout: form left, results right */
  .rc-calculator .layout-columns {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
  }

  .rc-calculator .layout-form {
    flex: 1.1;
    min-width: 0;
  }

  .rc-calculator .layout-results {
    flex: 1;
    min-width: 0;
    position: sticky;
    top: 1.5rem;
  }

  .rc-calculator .layout-results .results {
    margin-top: 0;
  }

  /* Results */
  .rc-calculator .results {
    margin-top: 2.5rem;
    padding: 2rem;
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 8px;
  }

  .rc-calculator .results h3 { margin: 1.5rem 0 0.75rem; font-size: 1.6rem; color: #145da0; }

  .rc-calculator .total {
    font-size: 1.6rem;
    margin: 1.25rem 0 0;
    padding: 1.1rem;
    background: #fff4e8;
    border-radius: 6px;
  }

  .rc-calculator .note { color: #777; font-size: 1.2rem; }

  /* Breakdown table */
  .rc-calculator .breakdown-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 1.3rem;
  }

  .rc-calculator .breakdown-table thead th {
    text-align: left;
    padding: 0.6rem 0.75rem;
    border-bottom: 2px solid #ddd;
    font-size: 1.1rem;
    color: #555;
    text-transform: uppercase;
    letter-spacing: 0.03em;
  }

  .rc-calculator .breakdown-table thead th:last-child { text-align: right; }

  .rc-calculator .breakdown-table tbody td {
    padding: 0.8rem 0.75rem;
    border-bottom: 1px solid #eee;
    vertical-align: top;
  }

  .rc-calculator .gallons-cell {
    text-align: right;
    white-space: nowrap;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
  }

  .rc-calculator .breakdown-detail {
    display: block;
    font-size: 1.12rem;
    color: #888;
    font-weight: 400;
    margin-top: 0.2rem;
  }

  /* Tips box */
  .rc-calculator .tips-box {
    margin-top: 1.25rem;
    padding: 1rem 1.25rem;
    background: #fdf8e8;
    border: 1px solid #e8dca0;
    border-radius: 6px;
    font-size: 1.25rem;
  }

  .rc-calculator .tips-box strong { display: block; margin-bottom: 0.25rem; }
  .rc-calculator .tips-box ul { margin: 0; padding-left: 1.25rem; }
  .rc-calculator .tips-box li { margin-bottom: 0.25rem; }
  .rc-calculator .tips-box li:last-child { margin-bottom: 0; }

  /* Kit list */
  .rc-calculator .kit-list { list-style: none; padding: 0; margin: 0; }

  .rc-calculator .kit-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid #eee;
  }

  .rc-calculator .kit-item:last-child { border-bottom: none; }

  .rc-calculator .kit-image {
    width: 80px;
    height: 80px;
    object-fit: contain;
    border-radius: 6px;
    border: 1px solid #eee;
    flex-shrink: 0;
  }

  .rc-calculator .kit-info { display: flex; flex-direction: column; gap: 0.25rem; flex: 1; min-width: 0; }

  .rc-calculator .kit-name-row {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    flex-wrap: wrap;
    font-size: 1.25rem;
  }

  .rc-calculator .kit-total { font-weight: 700; color: #145da0; font-size: 1.4rem; }
  .rc-calculator .kit-brand { font-size: 1.15rem; color: #145da0; font-weight: 500; }

  .rc-calculator .kit-meta {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
  }

  .rc-calculator .kit-price { font-size: 1.2rem; color: #555; }
  .rc-calculator .kit-reason { font-size: 1.2rem; color: #777; }

  .rc-calculator .btn-cart {
    padding: 0.65rem 1.25rem;
    background: #ff810f;
    color: #fff;
    font-family: inherit;
    font-size: 1.25rem;
    font-weight: 600;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.2s;
    flex-shrink: 0;
  }

  .rc-calculator .btn-cart:hover { background: #e06d00; }
  .rc-calculator .btn-cart:disabled { cursor: default; }
  .rc-calculator .btn-cart-disabled { background: #999; }
  .rc-calculator .btn-cart-disabled:hover { background: #999; }
  .rc-calculator .btn-cart-success { background: #e06d00; }
  .rc-calculator .error { color: #b00; font-weight: 600; }

  /* Alternatives */
  .rc-calculator .alternatives-section {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid #eee;
  }

  .rc-calculator .alternatives-note { color: #777; font-size: 1.25rem; margin: 0 0 0.75rem; }
  .rc-calculator .alternatives-list { list-style: none; padding: 0; margin: 0; }

  .rc-calculator .alternative-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid #f0f0f0;
  }

  .rc-calculator .alternative-item:last-child { border-bottom: none; }
  .rc-calculator .alternative-info { display: flex; flex-direction: column; gap: 0.15rem; }
  .rc-calculator .alternative-vendor { font-size: 1.15rem; color: #145da0; font-weight: 500; }
  .rc-calculator .alternative-sizes { font-size: 1.15rem; color: #888; }

  .rc-calculator .btn-view {
    padding: 0.55rem 1rem;
    background: #145da0;
    color: #fff;
    font-size: 1.2rem;
    font-weight: 600;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    white-space: nowrap;
    text-decoration: none;
    transition: background 0.2s;
    flex-shrink: 0;
  }

  .rc-calculator .btn-view:hover { background: #0e4d8a; }

  .rc-calculator .rc-footer {
    text-align: center;
    padding: 2rem 0 0;
    color: #666;
    font-size: 1.2rem;
  }

  /* Responsive — stack columns on tablet and below */
  @media (max-width: 768px) {
    .rc-calculator .layout-columns {
      flex-direction: column;
    }
    .rc-calculator .layout-results {
      position: static;
    }
    .rc-calculator .calc-type-row {
      grid-template-columns: repeat(2, 1fr);
    }
  }

  @media (max-width: 600px) {
    .rc-calculator { padding: 0 1rem; }
    .rc-calculator .calc-type-row { grid-template-columns: 1fr; }
    .rc-calculator .resin-card,
    .rc-calculator .cure-speed-card { flex: 1 1 100%; min-width: 0; }
    .rc-calculator .fabric-card { flex: 1 1 calc(50% - 0.5rem); min-width: 0; }
    .rc-calculator .kit-item { flex-direction: column; align-items: flex-start; gap: 0.75rem; }
    .rc-calculator .alternative-item { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
  }

  /* -----------------------------------------------------------------------
     Results empty state
     ----------------------------------------------------------------------- */
  .rc-calculator .rc-results-empty {
    padding: 3rem 1.5rem;
    text-align: center;
    background: #fff;
    border: 1px dashed #ddd;
    border-radius: 6px;
    color: #999;
  }

  .rc-calculator .rc-results-empty-icon {
    font-size: 2.7rem;
    display: block;
    margin-bottom: 0.75rem;
  }

  .rc-calculator .rc-results-empty-text {
    font-size: 1.4rem;
    font-weight: 600;
    color: #666;
    margin: 0 0 0.25rem;
  }

  .rc-calculator .rc-results-empty-hint {
    font-size: 1.15rem;
    margin: 0;
    color: #999;
  }

  /* -----------------------------------------------------------------------
     Save to Project button
     ----------------------------------------------------------------------- */
  .rc-calculator .rc-save-to-project-wrapper {
    margin-top: 1.25rem;
    padding-top: 1rem;
    border-top: 1px solid #eee;
    text-align: center;
  }

  .rc-calculator .rc-btn-save-project {
    padding: 0.65rem 1.5rem;
    background: #145da0;
    color: #fff;
    font-family: inherit;
    font-size: 1.25rem;
    font-weight: 600;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    transition: background 0.2s;
  }

  .rc-calculator .rc-btn-save-project:hover {
    background: #0e4d8a;
  }

  .rc-calculator .rc-btn-save-project.saved {
    background: #2e7d32;
    cursor: default;
  }

  /* -----------------------------------------------------------------------
     Inline project button
     ----------------------------------------------------------------------- */
  .rc-calculator .rc-project-bar-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: #fff;
    color: #145da0;
    border: 2px solid #145da0;
    border-radius: 25px;
    font-family: inherit;
    font-size: 1.15rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
    margin-bottom: 1rem;
    position: relative;
  }

  .rc-calculator .rc-project-bar-btn:hover {
    background: #145da0;
    color: #fff;
  }

  .rc-calculator .rc-project-bar-icon {
    font-size: 1.2rem;
    line-height: 1;
  }

  .rc-calculator .rc-project-bar-label {
    line-height: 1;
  }

  .rc-calculator .rc-project-drawer-badge {
    background: #ff810f;
    color: #fff;
    font-size: 0.9rem;
    font-weight: 700;
    min-width: 20px;
    height: 20px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 5px;
    line-height: 1;
  }

  /* -----------------------------------------------------------------------
     Project drawer overlay
     ----------------------------------------------------------------------- */
  .rc-calculator .rc-project-drawer-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 1001;
    opacity: 0;
    transition: opacity 0.3s ease;
  }

  .rc-calculator .rc-project-drawer-overlay.visible {
    opacity: 1;
  }

  /* -----------------------------------------------------------------------
     Project drawer panel
     ----------------------------------------------------------------------- */
  .rc-calculator .rc-project-drawer {
    position: fixed;
    top: 0;
    left: 0;
    width: 340px;
    height: 100vh;
    background: #fff;
    z-index: 1002;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
    box-shadow: 4px 0 16px rgba(0, 0, 0, 0.15);
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  }

  .rc-calculator .rc-project-drawer.open {
    transform: translateX(0);
  }

  .rc-calculator .rc-project-drawer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid #eee;
    flex-shrink: 0;
  }

  .rc-calculator .rc-project-drawer-header h2 {
    margin: 0;
    font-size: 1.35rem;
    color: #145da0;
  }

  .rc-calculator .rc-project-drawer-close {
    background: none;
    border: none;
    font-size: 1.7rem;
    cursor: pointer;
    color: #666;
    padding: 0.25rem;
    line-height: 1;
    font-family: inherit;
  }

  .rc-calculator .rc-project-drawer-close:hover {
    color: #333;
  }

  /* -----------------------------------------------------------------------
     Project drawer total bar
     ----------------------------------------------------------------------- */
  .rc-calculator .rc-project-total {
    padding: 0.75rem 1.25rem;
    background: #fff4e8;
    border-bottom: 1px solid #f0dcc0;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    flex-shrink: 0;
  }

  .rc-calculator .rc-project-total-label {
    font-size: 0.95rem;
    color: #777;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    font-weight: 600;
  }

  .rc-calculator .rc-project-total-value {
    font-size: 1.45rem;
    font-weight: 700;
    color: #145da0;
  }

  /* -----------------------------------------------------------------------
     Project drawer items area
     ----------------------------------------------------------------------- */
  .rc-calculator .rc-project-items {
    flex: 1;
    overflow-y: auto;
    padding: 0.75rem;
  }

  .rc-calculator .rc-project-empty {
    text-align: center;
    padding: 2rem 1rem;
    color: #999;
  }

  .rc-calculator .rc-project-empty-icon {
    font-size: 2.2rem;
    display: block;
    margin-bottom: 0.5rem;
  }

  .rc-calculator .rc-project-empty p {
    margin: 0.25rem 0;
    font-size: 1.1rem;
  }

  /* -----------------------------------------------------------------------
     Project item cards
     ----------------------------------------------------------------------- */
  .rc-calculator .rc-project-item {
    background: #f9f9f9;
    border: 1px solid #eee;
    border-radius: 8px;
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s;
  }

  .rc-calculator .rc-project-item:hover {
    border-color: #ccc;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
  }

  .rc-calculator .rc-project-item-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .rc-calculator .rc-project-item-name {
    font-weight: 600;
    font-size: 1.05rem;
    color: #333;
    flex: 1;
    border: none;
    background: transparent;
    padding: 0;
    font-family: inherit;
    cursor: text;
    outline: none;
    min-width: 0;
  }

  .rc-calculator .rc-project-item-name:focus {
    background: #fff;
    border: 1px solid #145da0;
    border-radius: 4px;
    padding: 0.15rem 0.3rem;
    margin: -0.15rem -0.3rem;
  }

  .rc-calculator .rc-project-item-delete {
    background: none;
    border: none;
    color: #ccc;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0;
    line-height: 1;
    flex-shrink: 0;
    transition: color 0.2s;
    font-family: inherit;
  }

  .rc-calculator .rc-project-item-delete:hover {
    color: #e53935;
  }

  .rc-calculator .rc-project-item-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.35rem;
  }

  .rc-calculator .rc-project-item-type {
    font-size: 0.92rem;
    color: #fff;
    background: #145da0;
    padding: 0.1rem 0.5rem;
    border-radius: 10px;
    font-weight: 500;
  }

  .rc-calculator .rc-project-item-gallons {
    font-size: 1.0rem;
    font-weight: 600;
    color: #555;
  }

  /* -----------------------------------------------------------------------
     Project drawer footer
     ----------------------------------------------------------------------- */
  .rc-calculator .rc-project-drawer-footer {
    padding: 0.75rem 1.25rem;
    border-top: 1px solid #eee;
    flex-shrink: 0;
  }

  .rc-calculator .rc-project-clear-btn {
    width: 100%;
    padding: 0.5rem;
    background: #fff;
    color: #e53935;
    border: 1px solid #e53935;
    border-radius: 25px;
    font-family: inherit;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
  }

  .rc-calculator .rc-project-clear-btn:hover {
    background: #e53935;
    color: #fff;
  }

  /* -----------------------------------------------------------------------
     Responsive — Project drawer on mobile
     ----------------------------------------------------------------------- */
  @media (max-width: 768px) {
    .rc-calculator .rc-project-drawer {
      width: 100%;
      max-width: 360px;
    }

    .rc-calculator .ref-table {
      font-size: 1.02rem;
    }

    .rc-calculator .ref-table thead th,
    .rc-calculator .ref-table tbody td {
      padding: 0.45rem 0.5rem;
    }

    .rc-calculator .ref-accordion-title {
      font-size: 1.12rem;
      padding: 0.85rem 1rem;
    }

    .rc-calculator .ref-accordion-body {
      padding: 0 1rem 1rem;
    }
  }

  /* -----------------------------------------------------------------------
     Reference tables
     ----------------------------------------------------------------------- */
  .rc-calculator .reference-section {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px solid #ddd;
  }

  .rc-calculator .reference-heading {
    font-size: 1.7rem;
    color: #145da0;
    margin: 0 0 0.5rem;
  }

  .rc-calculator .reference-intro {
    color: #555;
    font-size: 1.25rem;
    margin: 0 0 1.5rem;
    line-height: 1.6;
    max-width: 720px;
  }

  /* Accordion */
  .rc-calculator .ref-accordion {
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 8px;
    margin-bottom: 0.75rem;
    overflow: hidden;
  }

  .rc-calculator .ref-accordion[open] {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  }

  .rc-calculator .ref-accordion-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    font-weight: 600;
    font-size: 1.3rem;
    color: #1a1a1a;
    cursor: pointer;
    list-style: none;
    user-select: none;
    transition: background 0.15s;
  }

  .rc-calculator .ref-accordion-title::-webkit-details-marker {
    display: none;
  }

  .rc-calculator .ref-accordion-title::marker {
    content: '';
  }

  .rc-calculator .ref-accordion-title:hover {
    background: #fafafa;
  }

  .rc-calculator .ref-chevron {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    position: relative;
  }

  .rc-calculator .ref-chevron::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 8px;
    height: 8px;
    border-right: 2px solid #999;
    border-bottom: 2px solid #999;
    transform: translate(-50%, -60%) rotate(45deg);
    transition: transform 0.2s;
  }

  .rc-calculator .ref-accordion[open] .ref-chevron::before {
    transform: translate(-50%, -40%) rotate(-135deg);
  }

  .rc-calculator .ref-accordion-body {
    padding: 0 1.25rem 1.25rem;
  }

  /* Reference tables */
  .rc-calculator .ref-table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 0.75rem 0;
  }

  .rc-calculator .ref-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 1.15rem;
    white-space: nowrap;
  }

  .rc-calculator .ref-table thead th {
    text-align: left;
    padding: 0.6rem 0.75rem;
    border-bottom: 2px solid #e0e0e0;
    font-size: 1.02rem;
    font-weight: 600;
    color: #555;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    background: #fafafa;
    vertical-align: bottom;
  }

  .rc-calculator .ref-table thead th.num {
    text-align: right;
  }

  .rc-calculator .ref-table .th-unit {
    display: block;
    font-size: 0.92rem;
    font-weight: 400;
    text-transform: none;
    letter-spacing: 0;
    color: #888;
    margin-top: 0.1rem;
  }

  .rc-calculator .ref-table tbody td {
    padding: 0.55rem 0.75rem;
    border-bottom: 1px solid #f0f0f0;
    vertical-align: top;
    color: #333;
  }

  .rc-calculator .ref-table tbody tr:last-child td {
    border-bottom: none;
  }

  .rc-calculator .ref-table tbody tr:hover td {
    background: rgba(20, 93, 160, 0.03);
  }

  .rc-calculator .ref-table td.num {
    text-align: right;
    font-variant-numeric: tabular-nums;
    font-weight: 500;
  }

  .rc-calculator .ref-table-narrow {
    max-width: 360px;
  }

  .rc-calculator .ref-table-compare td:first-child {
    font-weight: 500;
    white-space: normal;
    min-width: 140px;
  }

  .rc-calculator .ref-table-compare td {
    white-space: normal;
  }

  /* Notes, footnotes, body text */
  .rc-calculator .ref-note {
    color: #555;
    font-size: 1.2rem;
    margin: 0 0 0.5rem;
    line-height: 1.5;
  }

  .rc-calculator .ref-footnote {
    color: #777;
    font-size: 1.1rem;
    margin: 0.75rem 0 0;
    line-height: 1.5;
  }

  .rc-calculator .ref-body {
    color: #444;
    font-size: 1.2rem;
    margin: 0.5rem 0;
    line-height: 1.55;
  }

  .rc-calculator .ref-subhead {
    font-size: 1.25rem;
    font-weight: 600;
    color: #145da0;
    margin: 1.25rem 0 0.4rem;
  }

  /* Formula boxes */
  .rc-calculator .ref-formula-box {
    background: #f8f6f0;
    border: 1px solid #e8dca0;
    border-radius: 6px;
    padding: 0.75rem 1rem;
    margin: 0.75rem 0;
  }

  .rc-calculator .ref-formula-box strong {
    display: block;
    font-size: 1.02rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: #777;
    margin-bottom: 0.35rem;
  }

  .rc-calculator .ref-formula-box code {
    display: block;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 1.15rem;
    color: #1a1a1a;
    word-break: break-word;
    white-space: pre-wrap;
    line-height: 1.5;
  }

  .rc-calculator .ref-formula-note {
    display: block;
    font-size: 1.05rem;
    color: #888;
    margin-top: 0.35rem;
  }