:root {
    /* Primary brand colors reminiscent of MDCalc styling */
    --mdcalc-primary: #007b83;      /* A teal-like color */
    --mdcalc-primary-hover: #00646a;
    --mdcalc-bg: #f2f2f2;
    --mdcalc-header-bg: #fff;
    --mdcalc-text: #333;
    --mdcalc-border: #dcdcdc;
    --mdcalc-accent-bg: #eaf7f7;    /* Light teal background */
    --mdcalc-card-bg: #fff;
    --mdcalc-error: #dc2626;
    --mdcalc-label: #4a5568;
    --mdcalc-light-text: #666;
    --input-height: 48px;
  }
  
  /* Reset & Base */
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
      "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    background-color: var(--mdcalc-bg);
    color: var(--mdcalc-text);
    line-height: 1.5;
  }
  
  /* Header */
  .mdcalc-header {
    background: var(--mdcalc-header-bg);
    border-bottom: 1px solid var(--mdcalc-border);
    padding: 1rem 0 1rem;
    margin-bottom: 1rem;
    text-align: center;
  }
  
  .mdcalc-header-content {
    max-width: 750px;
    margin: 0 auto;
    padding: 0 1rem;
  }
  
  .mdcalc-header-content h1 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
  }
  
  .mdcalc-header-content p {
    font-size: 1rem;
    color: #666;
  }
  
  /* Container */
  .mdcalc-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
  }
  
  /* Two Column Layout */
  .mdcalc-two-column {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
  }
  
  .mdcalc-left-column {
    flex: 0 0 60%;
    max-width: 60%;
  }
  
  .mdcalc-right-column {
    flex: 0 0 40%;
    max-width: 40%;
    position: sticky;
    top: 1rem;
  }
  
  /* Section titles */
  .section-title {
    font-size: 1.3rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--mdcalc-primary);
  }
  
  /* Intro & Pearls */
  .mdcalc-intro-section {
    background-color: var(--mdcalc-card-bg);
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    padding: 1.5rem;
    margin-bottom: 1rem;
  }
  
  .mdcalc-intro-section p {
    margin-bottom: 1.5rem;
    color: var(--mdcalc-light-text);
  }
  
  .mdcalc-pearls {
    background-color: var(--mdcalc-accent-bg);
    border: 1px solid var(--mdcalc-border);
    border-radius: 6px;
    padding: 1rem;
  }
  
  .pearls-title {
    font-size: 1rem;
    margin-bottom: 0.75rem;
  }
  
  .mdcalc-pearls ul {
    list-style: disc;
    padding-left: 1.5rem;
    color: var(--mdcalc-text);
  }
  
  /* Card for the calculator form */
  .mdcalc-card {
    background-color: var(--mdcalc-card-bg);
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    padding: 1.5rem;
    margin-bottom: 1rem;
  }
  
  /* Calculator Form */
  .mdcalc-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }
  
  .mdcalc-form-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
  }
  
  /* Form group */
  .form-group {
    flex: 1;
    min-width: 220px;
    margin-bottom: 0.7rem;
  }
  
  .input-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--mdcalc-label);
  }
  
  .input-field {
    position: relative;
    margin-bottom: 0.6rem;
  }
  
  .input-field input {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--mdcalc-border);
    border-radius: 4px;
    font-size: 1rem;
  }
  
  .input-field.error input {
    border-color: #e74c3c;
  }
  
  .input-field input:focus {
    outline: none;
    border-color: var(--mdcalc-primary);
    box-shadow: 0 0 0 3px rgba(0, 123, 131, 0.1);
  }
  
  .unit-label {
    color: var(--mdcalc-light-text);
    margin-left: 0.5rem;
  }
  
  /* Toggle Switch / Radio style */
  .switch {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-bottom: 0.5rem;
  }
  
  .switch input[type="radio"] {
    display: none;
  }
  
  .switch label {
    display: inline-flex;
    align-items: center;
    cursor: pointer;
    padding: 0.4rem 0.75rem;
    font-size: 0.9rem;
    border: 1px solid var(--mdcalc-border);
    border-radius: 4px;
    color: var(--mdcalc-text);
    background-color: #fff;
    transition: background-color 0.2s;
  }
  
  .switch input[type="radio"]:checked + label {
    background-color: var(--mdcalc-primary);
    color: #fff;
    border-color: var(--mdcalc-primary);
  }
  
  /* Toggle buttons for 'Height & Weight' vs 'Direct BSA' */
  .toggle-switch-row {
    margin-top: -0.5rem;
  }
  
  .toggle-switch {
    display: flex;
    gap: 8px;
    width: 100%;
  }
  
  .toggle-option {
    flex: 1;
    text-align: center;
    padding: 0.6rem 0;
    cursor: pointer;
    background-color: #fff;
    border: 1px solid var(--mdcalc-border);
    border-radius: 4px;
    color: var(--mdcalc-text);
    font-weight: 600;
    transition: background-color 0.2s;
  }
  
  .toggle-option.active {
    background-color: var(--mdcalc-primary);
    border-color: var(--mdcalc-primary);
    color: #fff;
  }
  
  /* Normal ranges */
  .norm-range {
    font-size: 0.85rem;
    color: var(--mdcalc-light-text);
    margin-top: 0.5rem;
  }
  
  /* Errors */
  .error {
    color: var(--mdcalc-error);
    font-size: 0.9rem;
    margin-top: -0.5rem;
  }
  
  .loading {
    display: none;
    margin-top: -0.5rem;
    color: var(--mdcalc-primary);
  }
  
  .loading.visible {
    display: block;
  }
  
  /* Sticky Footer */
  .mdcalc-sticky-footer {
    position: sticky;
    bottom: 0;
    background: #fff;
    padding-top: 1rem;
  }
  
  .calculate-btn {
    width: 100%;
    height: var(--input-height);
    background-color: var(--mdcalc-primary);
    border: none;
    border-radius: 6px;
    color: #fff;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
  }
  
  .calculate-btn:hover {
    background-color: var(--mdcalc-primary-hover);
  }
  
  /* Results Card */
  .mdcalc-results-card {
    background-color: var(--mdcalc-card-bg);
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    padding: 1.5rem;
    margin-bottom: 1rem;
  }
  
  .results {
    background: var(--mdcalc-accent-bg);
    border: 1px solid var(--mdcalc-border);
    border-radius: 6px;
    padding: 1rem;
    margin-bottom: 1rem;
  }
  
  .result-item {
    margin-bottom: 1rem;
  }
  
  .result-label {
    font-size: 1rem;
    color: var(--mdcalc-label);
    margin-bottom: 0.2rem;
  }
  
  .result-value {
    font-size: 1.8rem;
    color: var(--mdcalc-primary);
    font-weight: 600;
  }
  
  .result-value .precise {
    font-size: 1rem;
    margin-left: 0.5rem;
    color: var(--mdcalc-light-text);
  }
  
  /* Extra Info, Interpretation, References */
  .mdcalc-extra-info {
    background-color: var(--mdcalc-card-bg);
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    padding: 1.5rem;
    margin-bottom: 2rem;
  }
  
  .mdcalc-extra-info p {
    margin-bottom: 0.75rem;
    line-height: 1.4;
  }
  
  .mdcalc-extra-info strong {
    color: var(--mdcalc-primary);
  }
  
  .references {
    margin-top: 1rem;
  }
  
  .references ul {
    list-style: disc;
    padding-left: 1.2rem;
    line-height: 1.4;
  }
  
  .references li {
    margin-bottom: 0.5rem;
  }
  
  /* Results visibility control */
  .mobile-only-results {
    display: none;
  }
  
  .desktop-only-results {
    display: block;
  }
  
  /* Mobile-specific styles */
  @media (max-width: 1024px) {
    .mdcalc-two-column {
      flex-direction: column;
      gap: 1rem;
    }

    .mdcalc-left-column,
    .mdcalc-right-column {
      flex: 0 0 100%;
      max-width: 100%;
    }

    .mdcalc-right-column {
      position: static;
    }

    /* Show mobile results and hide desktop results */
    .mobile-only-results {
      display: block;
      margin-top: 1rem;
    }

    .mdcalc-right-column .mdcalc-results-card {
      display: none;
    }

    /* Reorder sections on mobile */
    .mdcalc-left-column {
      display: flex;
      flex-direction: column;
    }

    .mdcalc-card {
      order: 1;
    }

    .mobile-only-results {
      order: 2;
    }

    .mdcalc-intro-section {
      order: 3;
    }

    .mdcalc-extra-info {
      order: 4;
    }

    .desktop-only-results {
      display: none;
    }
  }
  
  .validation-error {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    color: #e74c3c;
    font-size: 0.85rem;
    margin-right: 3rem;
    pointer-events: none;
  }
  
  /* Remove the popup styling */
  .validation-error::after {
    display: none;
  }
  
  .error input {
    border-color: #e74c3c;
  }
  
  /* Feet and inches specific styles */
  .height-field .feet-inches {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-top: 8px;
  }

  .height-field .feet-inches input {
    width: calc(50% - 4px);
  }

  .height-field .feet-inches .unit-label {
    position: static;
    margin: 0;
    padding: 0;
    width: auto;
  }

  .height-field #height:not([style*="display: none"]) + .unit-label {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--mdcalc-light-text);
  }