/* =========================================================================
   THREE C Biochar Production Calculation Tool: styles, copied unchanged
   from the website version. Do not edit here; update both together.
   ========================================================================= */
    /* Reset & Scoped Base Typography (Professional Polish Theme) */
    .bpt-container {
      font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
      color: #2B2B2B;
      max-width: 1040px;
      margin: 0 auto;
      padding: 24px;
      box-sizing: border-box;
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    .bpt-container * {
      box-sizing: border-box;
      font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    }

    /* Header Section */
    .bpt-header {
      margin-bottom: 24px;
    }
    .bpt-title {
      color: #1D3A8F;
      font-size: 26px;
      font-weight: 700;
      line-height: 1.25;
      margin: 0 0 6px 0;
      letter-spacing: -0.01em;
    }
    .bpt-intro {
      color: #2B2B2B;
      font-size: 14px;
      line-height: 1.45;
      margin: 0;
      max-width: 800px;
    }

    /* Disclaimer Banner (Positioned directly above calculator form) */
    .bpt-disclaimer-banner {
      background-color: #FFFBEB;
      border: 1px solid #FDE68A;
      border-left: 4px solid #D97706;
      border-radius: 8px;
      padding: 13px 16px;
      margin-bottom: 20px;
      display: flex;
      align-items: flex-start;
      gap: 12px;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
    }
    .bpt-disclaimer-icon-wrap {
      flex-shrink: 0;
      color: #D97706;
      margin-top: 1px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .bpt-disclaimer-icon {
      width: 19px;
      height: 19px;
    }
    .bpt-disclaimer-body {
      flex: 1;
    }
    .bpt-disclaimer-title {
      font-size: 13px;
      font-weight: 700;
      color: #92400E;
      margin: 0 0 3px 0;
      line-height: 1.3;
    }
    .bpt-disclaimer-text {
      margin: 0;
      font-size: 12.5px;
      line-height: 1.5;
      color: #78350F;
    }

    /* Form Card (Input Section Background: #B4BFEF) */
    .bpt-form-card {
      background-color: #B4BFEF;
      border-radius: 8px;
      padding: 24px;
      margin-bottom: 24px;
      box-shadow: 0 2px 8px rgba(29, 58, 143, 0.08);
    }

    /* Sections within Form (Professional White Card Style) */
    .bpt-section {
      background-color: #FFFFFF;
      border-radius: 8px;
      padding: 18px 20px;
      margin-bottom: 14px;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
      border: 1px solid rgba(124, 136, 196, 0.25);
      position: relative;
    }
    .bpt-section:last-child {
      margin-bottom: 0;
    }
    .bpt-section-header {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 12px;
      flex-wrap: wrap;
    }
    .bpt-section-title {
      color: #1D3A8F;
      font-size: 16px;
      font-weight: 600;
      margin: 0;
    }

    /* Circular Info Icon Button */
    .bpt-info-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 17px;
      height: 17px;
      border-radius: 50%;
      background-color: transparent;
      color: #1D3A8F;
      border: 1.5px solid #1D3A8F;
      font-size: 11px;
      font-weight: bold;
      cursor: pointer;
      padding: 0;
      line-height: 1;
      transition: background-color 0.15s ease, color 0.15s ease, transform 0.15s ease;
      flex-shrink: 0;
      user-select: none;
    }
    .bpt-info-btn:hover,
    .bpt-info-btn:focus {
      background-color: #1D3A8F;
      color: #FFFFFF;
      outline: none;
      transform: scale(1.08);
    }

    /* Tooltip / Info Callout Box */
    .bpt-tooltip {
      position: relative;
      z-index: 10;
      background-color: #EBF1FF;
      color: #1D3A8F;
      font-size: 12.5px;
      font-weight: 400;
      line-height: 1.45;
      padding: 10px 14px;
      border-radius: 6px;
      border-left: 4px solid #1D3A8F;
      border-top: 1px solid rgba(29, 58, 143, 0.15);
      border-right: 1px solid rgba(29, 58, 143, 0.15);
      border-bottom: 1px solid rgba(29, 58, 143, 0.15);
      margin-top: 6px;
      margin-bottom: 12px;
      box-shadow: 0 2px 6px rgba(29, 58, 143, 0.08);
      width: 100%;
    }
    .bpt-tooltip strong {
      font-weight: 700;
      color: #1D3A8F;
    }
    .bpt-hidden {
      display: none !important;
    }

    /* 2-Column Grid for Dropdowns */
    .bpt-grid-2 {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    /* Field Labels */
    .bpt-field-label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      color: #2B2B2B;
      margin-bottom: 6px;
    }

    /* Custom Dropdown Wrapper with Visible Chevron */
    .bpt-dropdown-wrapper {
      position: relative;
      width: 100%;
    }
    .bpt-select {
      width: 100%;
      appearance: none;
      -webkit-appearance: none;
      -moz-appearance: none;
      background-color: #FFFFFF;
      border: 1px solid #7C88C4;
      border-radius: 4px;
      padding: 10px 36px 10px 12px;
      font-size: 14px;
      color: #2B2B2B;
      font-weight: 500;
      line-height: 1.4;
      cursor: pointer;
      word-break: normal;
      overflow-wrap: normal;
      white-space: normal;
      transition: border-color 0.15s ease, box-shadow 0.15s ease;
    }
    .bpt-select:focus {
      outline: none;
      border-color: #2F5FE3;
      box-shadow: 0 0 0 2px rgba(47, 95, 227, 0.2);
    }
    .bpt-chevron-icon {
      position: absolute;
      right: 12px;
      top: 50%;
      transform: translateY(-50%);
      pointer-events: none;
      width: 14px;
      height: 14px;
      color: #1D3A8F;
    }

    /* Quantity Section Toggle (Radio Pill Buttons) */
    .bpt-toggle-group {
      display: flex;
      align-items: center;
      gap: 12px;
      flex-wrap: wrap;
      margin-bottom: 14px;
    }
    .bpt-toggle-title {
      font-size: 13px;
      font-weight: 600;
      color: #2B2B2B;
    }
    .bpt-pills-container {
      display: inline-flex;
      background-color: #FFFFFF;
      border: 1px solid #7C88C4;
      border-radius: 20px;
      padding: 0;
      gap: 0;
      overflow: hidden;
    }
    .bpt-radio-pill {
      position: relative;
      cursor: pointer;
      margin: 0;
    }
    .bpt-radio-input {
      position: absolute;
      opacity: 0;
      width: 0;
      height: 0;
    }
    .bpt-pill-label {
      display: inline-block;
      padding: 6px 16px;
      border-radius: 0;
      font-size: 13px;
      font-weight: 600;
      color: #1D3A8F;
      transition: background-color 0.2s ease, color 0.2s ease;
      user-select: none;
    }
    .bpt-radio-input:checked + .bpt-pill-label {
      background-color: #2F5FE3;
      color: #FFFFFF;
    }
    .bpt-radio-input:focus-visible + .bpt-pill-label {
      outline: 2px solid #1D3A8F;
      outline-offset: -2px;
    }

    /* Input Field with Inline Suffix */
    .bpt-input-container {
      max-width: 440px;
    }
    .bpt-input-wrapper {
      display: flex;
      align-items: center;
      background-color: #FFFFFF;
      border: 1px solid #7C88C4;
      border-radius: 4px;
      overflow: hidden;
      transition: border-color 0.15s ease, box-shadow 0.15s ease;
    }
    .bpt-input-wrapper:focus-within {
      border-color: #2F5FE3;
      box-shadow: 0 0 0 2px rgba(47, 95, 227, 0.2);
    }
    .bpt-input {
      flex: 1;
      border: none;
      padding: 10px 12px;
      font-size: 14px;
      font-weight: 500;
      color: #2B2B2B;
      outline: none;
      background: transparent;
      width: 100%;
    }
    .bpt-input::placeholder {
      color: #7C88C4;
      opacity: 0.8;
    }
    .bpt-unit-suffix {
      background-color: #F0F2FA;
      color: #1D3A8F;
      font-size: 13px;
      font-weight: 600;
      padding: 0 14px;
      height: 40px;
      display: flex;
      align-items: center;
      border-left: 1px solid #7C88C4;
      white-space: nowrap;
      user-select: none;
    }

    /* Visual Validation / Error Style (Text: #D64545 on Background: #FDEDED) */
    .bpt-error-banner {
      background-color: #FDEDED;
      color: #D64545;
      border-left: 4px solid #D64545;
      border-top: 1px solid rgba(214, 69, 69, 0.2);
      border-right: 1px solid rgba(214, 69, 69, 0.2);
      border-bottom: 1px solid rgba(214, 69, 69, 0.2);
      border-radius: 4px;
      padding: 10px 14px;
      font-size: 13px;
      font-weight: 600;
      margin-top: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    /* Action Row */
    .bpt-actions {
      display: flex;
      gap: 16px;
      margin-top: 24px;
      padding-top: 16px;
      border-top: 1px solid rgba(124, 136, 196, 0.3);
    }
    .bpt-btn {
      padding: 12px 24px;
      font-size: 15px;
      font-weight: 600;
      border-radius: 4px;
      cursor: pointer;
      text-align: center;
      transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .bpt-btn-primary {
      flex: 1;
      background-color: #2F5FE3;
      color: #FFFFFF;
      border: 1px solid #2F5FE3;
      box-shadow: 0 2px 4px rgba(47, 95, 227, 0.15);
    }
    .bpt-btn-primary:hover,
    .bpt-btn-primary:focus {
      background-color: #1E44B8;
      border-color: #1E44B8;
      color: #FFFFFF;
    }
    .bpt-btn-secondary {
      flex: 1;
      background-color: #FFFFFF;
      color: #2F5FE3;
      border: 1px solid #2F5FE3;
    }
    .bpt-btn-secondary:hover,
    .bpt-btn-secondary:focus {
      background-color: #F0F4FF;
      color: #1E44B8;
      border-color: #1E44B8;
    }

    /* Calculation Results Section (Background: #CDE59A) */
    .bpt-results-card {
      background-color: #CDE59A;
      border-radius: 12px;
      padding: 24px;
      margin-bottom: 24px;
      border: 2px solid #A8C96C;
      box-shadow: 0 4px 12px rgba(29, 58, 143, 0.08);
      transition: box-shadow 0.3s ease, transform 0.3s ease, background-color 0.3s ease;
    }
    .bpt-highlight-pulse {
      animation: bptPulseHighlight 1.2s ease-out;
    }
    @keyframes bptPulseHighlight {
      0% {
        background-color: #CDE59A;
      }
      50% {
        background-color: #E6F3CC;
      }
      100% {
        background-color: #CDE59A;
      }
    }
    .bpt-results-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 20px;
      flex-wrap: wrap;
      gap: 12px;
    }
    .bpt-results-title {
      color: #1D3A8F;
      font-size: 20px;
      font-weight: 700;
      margin: 0;
    }
    .bpt-results-badge {
      background-color: #1D3A8F;
      color: #FFFFFF;
      font-size: 11px;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 4px;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }

    /* 2x2 Grid for Metrics */
    .bpt-metrics-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-bottom: 24px;
    }
    .bpt-metric-card {
      background: rgba(255, 255, 255, 0.4);
      border-radius: 8px;
      padding: 14px 16px;
      border: 1px solid rgba(29, 58, 143, 0.12);
      position: relative;
    }
    .bpt-metric-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 8px;
      margin-bottom: 6px;
    }
    .bpt-metric-label {
      font-size: 12px;
      font-weight: 600;
      color: #2B2B2B;
      margin: 0;
      word-break: normal;
      overflow-wrap: normal;
    }
    .bpt-metric-value-row {
      display: flex;
      align-items: baseline;
      gap: 8px;
      flex-wrap: nowrap;
      white-space: nowrap;
    }
    .bpt-metric-value {
      color: #1D3A8F;
      font-size: 24px;
      font-weight: 700;
      line-height: 1.15;
    }
    .bpt-metric-unit {
      color: #1D3A8F;
      font-size: 14px;
      font-weight: 600;
      opacity: 0.8;
    }

    /* Actual Pathway Comparison Results Section */
    .bpt-comparison-section {
      background: rgba(255, 255, 255, 0.45);
      border-radius: 8px;
      padding: 20px;
      border: 1px solid rgba(29, 58, 143, 0.15);
      margin-top: 16px;
    }
    .bpt-comparison-title {
      color: #1D3A8F;
      font-size: 16px;
      font-weight: 600;
      margin: 0 0 6px 0;
    }
    .bpt-comparison-intro {
      color: #2B2B2B;
      font-size: 13px;
      margin: 0 0 16px 0;
      line-height: 1.4;
      opacity: 0.9;
    }
    .bpt-bar-comparison {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .bpt-bar-item {
      display: flex;
      flex-direction: column;
      gap: 4px;
    }
    .bpt-bar-top {
      display: flex;
      justify-content: space-between;
      align-items: baseline;
      gap: 12px;
      flex-wrap: wrap;
    }
    .bpt-bar-label {
      font-size: 13px;
      font-weight: 600;
      color: #2B2B2B;
    }
    .bpt-bar-val-text {
      font-size: 13px;
      font-weight: 700;
      color: #1D3A8F;
    }
    .bpt-bar-track {
      background-color: rgba(255, 255, 255, 0.5);
      border-radius: 6px;
      height: 24px;
      width: 100%;
      overflow: hidden;
      border: 1px solid rgba(124, 136, 196, 0.35);
      position: relative;
    }
    .bpt-bar-fill {
      height: 100%;
      border-radius: 5px;
      transition: width 0.6s cubic-bezier(0.16, 1, 0.3, 1);
      display: flex;
      align-items: center;
      padding-left: 10px;
      padding-right: 10px;
      color: #FFFFFF;
      font-size: 11px;
      font-weight: 700;
      white-space: nowrap;
    }
    .bpt-bar-fill-actual {
      width: 14%;
      background-color: #7C88C4;
    }
    .bpt-bar-fill-biochar {
      width: 100%;
      background-color: #1D3A8F;
    }

    /* Document Export Section (Appears after Calculate) */
    .bpt-doc-export-card {
      margin-top: 24px;
      padding: 18px 20px;
      background: rgba(255, 255, 255, 0.85);
      border: 1.5px solid rgba(29, 58, 143, 0.25);
      border-radius: 10px;
      box-shadow: 0 2px 10px rgba(29, 58, 143, 0.08);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      flex-wrap: wrap;
      transition: all 0.3s ease;
      animation: bptFadeInUp 0.35s ease-out;
    }
    @keyframes bptFadeInUp {
      from {
        opacity: 0;
        transform: translateY(6px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }
    .bpt-doc-export-left {
      display: flex;
      align-items: center;
      gap: 14px;
      flex: 1;
      min-width: 260px;
    }
    .bpt-doc-icon-badge {
      width: 44px;
      height: 44px;
      border-radius: 8px;
      background-color: #1D3A8F;
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      box-shadow: 0 2px 5px rgba(29, 58, 143, 0.2);
    }
    .bpt-doc-info {
      flex: 1;
    }
    .bpt-doc-title-row {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 4px;
      flex-wrap: wrap;
    }
    .bpt-doc-title {
      font-size: 15px;
      font-weight: 700;
      color: #1D3A8F;
      margin: 0;
    }
    .bpt-doc-status-badge {
      font-size: 11px;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 9999px;
      background-color: #E0E7FF;
      color: #1E44B8;
      letter-spacing: 0.02em;
    }
    .bpt-doc-status-badge.bpt-ready {
      background-color: #D1FAE5;
      color: #065F46;
    }
    .bpt-doc-desc {
      font-size: 12px;
      color: #475569;
      margin: 0;
      line-height: 1.4;
    }
    .bpt-doc-btn-wrap {
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .bpt-btn-doc {
      min-width: 200px;
      padding: 12px 24px;
      font-size: 14px;
      font-weight: 700;
      border-radius: 6px;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
      white-space: nowrap;
      user-select: none;
      text-decoration: none;
    }
    .bpt-btn-doc-create {
      background-color: #1D3A8F;
      color: #FFFFFF;
      border: 1px solid #1D3A8F;
      box-shadow: 0 2px 6px rgba(29, 58, 143, 0.25);
    }
    .bpt-btn-doc-create:hover,
    .bpt-btn-doc-create:focus {
      background-color: #152B6B;
      border-color: #152B6B;
      color: #FFFFFF;
      transform: translateY(-1px);
    }
    .bpt-btn-doc-download {
      background-color: #059669;
      color: #FFFFFF;
      border: 1px solid #047857;
      box-shadow: 0 2px 6px rgba(5, 150, 105, 0.25);
      animation: bptPulseSuccess 0.4s ease-out;
    }
    @keyframes bptPulseSuccess {
      0% { transform: scale(0.96); }
      50% { transform: scale(1.03); }
      100% { transform: scale(1); }
    }
    .bpt-btn-doc-download:hover,
    .bpt-btn-doc-download:focus {
      background-color: #047857;
      border-color: #065F46;
      color: #FFFFFF;
      transform: translateY(-1px);
    }
    .bpt-doc-btn-icon {
      width: 18px;
      height: 18px;
      flex-shrink: 0;
    }

    /* Single-column stacking below 900px */
    @media (max-width: 900px) {
      .bpt-container {
        padding: 16px;
      }
      .bpt-form-card,
      .bpt-results-card {
        padding: 18px;
      }
      .bpt-grid-2,
      .bpt-metrics-grid {
        grid-template-columns: 1fr;
      }
      .bpt-actions {
        flex-direction: column;
      }
      .bpt-btn-primary,
      .bpt-btn-secondary {
        width: 100%;
        flex: none;
      }
      .bpt-title {
        font-size: 22px;
      }
      .bpt-results-title {
        font-size: 18px;
      }
      .bpt-metric-value {
        font-size: 22px;
      }
      .bpt-bar-top {
        flex-direction: column;
        align-items: flex-start;
        gap: 2px;
      }
      .bpt-doc-export-card {
        flex-direction: column;
        align-items: stretch;
      }
      .bpt-doc-btn-wrap {
        width: 100%;
      }
      .bpt-btn-doc {
        width: 100%;
      }
    }