<div class="container">
  <div class="preview">
    <div class="text-display"><span>Hlop</span><sup>2</sup><span> x</span><sub>2</sub></div>
  </div>
  
  <div class="controls-container">
    <div class="controls">
      <div class="control-group">
        <label>
          Font Size: <span id="fontSizeValue">84</span>px
          <input type="range" id="fontSizeSlider" min="12" max="168" value="84">
        </label>
      </div>
      
      <div class="control-group">
        <fieldset>
          <legend>Scaling Type</legend>
          <label class="radio">
            <input type="radio" name="scalingType" value="fluid" checked>
            Fluid
          </label>
          <label class="radio">
            <input type="radio" name="scalingType" value="static">
            Static
          </label>
        </fieldset>
        
        <select id="scalingMode">
          <option value="fluidLarger">Larger</option>
          <option value="fluidDefault" selected>Default</option>
          <option value="fluidSmaller">Smaller</option>
        </select>
      </div>
      
      <div class="control-group">
        <label>
          Superscript Position: <span id="supPositionValue">-0.5</span>em
          <input type="range" id="supPositionSlider" min="-1" max="0" value="-0.5" step="0.01">
        </label>
      </div>
      
      <div class="control-group">
        <label>
          Subscript Position: <span id="subPositionValue">0.25</span>em
          <input type="range" id="subPositionSlider" min="0" max="1" value="0.25" step="0.01">
        </label>
      </div>
    </div>

    <div class="css-display">
      <h2>Current CSS</h2>
      <pre><code id="currentCSS"></code></pre>
    </div>
  </div>
</div>

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, sans-serif;
  line-height: 1.5;
  padding: 20px;
  background: #f5f5f5;
}

/* Default static styles for sup/sub */
sup, sub {
  position: relative;
  vertical-align: baseline;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.preview {
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  overflow: hidden;
}

.controls-container {
  display: flex;
  gap: 2rem;
}

.controls, .css-display {
  background: white;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  flex: 1;
  min-width: 0;
}

/* Stack vertically on mobile */
@media (max-width: 768px) {
  .controls-container {
    flex-direction: column;
  }
}

.text-display {
  font-family: "Times New Roman", serif;
  line-height: 1.2;
  color: #18181b;
}

.control-group {
  margin-bottom: 1.5rem;
}

.control-group:last-child {
  margin-bottom: 0;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: #18181b;
}

fieldset {
  border: none;
  padding: 0;
}

legend {
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.radio {
  display: inline-flex;
  align-items: center;
  margin-right: 1rem;
  font-weight: normal;
}

.radio input {
  margin-right: 0.5rem;
}

input[type="range"] {
  width: 100%;
  margin: 0.5rem 0;
}

select {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid #e4e4e7;
  border-radius: 4px;
  margin: 0.5rem 0;
  background: white;
}

select:disabled {
  background: #f5f5f5;
  cursor: not-allowed;
}

h2 {
  font-size: 1.125rem;
  font-weight: 500;
  margin-bottom: 1rem;
  color: #18181b;
}

pre {
  background: #f8f9fa;
  padding: 1rem;
  border-radius: 4px;
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.875rem;
  line-height: 1.7;
}

// Constants
const BROWSER_SMALLER = 0.83;
const SCALING_OPTIONS = {
  static: {
    formula: "smaller",
    multiplier: 1,
    offset: 0
  },
  fluidLarger: {
    formula: "calc(0.6em + 3px)",
    multiplier: 1.66667,
    offset: 3
  },
  fluidDefault: {
    formula: "calc(0.5em + 4px)",
    multiplier: 2,
    offset: 4
  },
  fluidSmaller: {
    formula: "calc(0.4em + 5px)",
    multiplier: 2.5,
    offset: 5
  }
};

// Elements
const textDisplay = document.querySelector('.text-display');
const fontSizeSlider = document.getElementById('fontSizeSlider');
const fontSizeValue = document.getElementById('fontSizeValue');
const scalingTypeRadios = document.querySelectorAll('input[name="scalingType"]');
const scalingMode = document.getElementById('scalingMode');
const supPositionSlider = document.getElementById('supPositionSlider');
const supPositionValue = document.getElementById('supPositionValue');
const subPositionSlider = document.getElementById('subPositionSlider');
const subPositionValue = document.getElementById('subPositionValue');
const currentCSS = document.getElementById('currentCSS');
const sup = document.querySelector('sup');
const sub = document.querySelector('sub');

// Calculate top position for sup/sub elements
function calculateTopPosition(position, scaling) {
  const option = SCALING_OPTIONS[scaling === 'static' ? 'static' : scalingMode.value];
  
  if (scaling === 'static') {
    return `${position}em`;
  }

  const scalingFactor = BROWSER_SMALLER * position * option.multiplier;
  const emValue = Math.round(scalingFactor * 100) / 100;
  const pxValue = Math.round(scalingFactor * option.offset * 100) / 100;
  const operator = pxValue >= 0 ? '-' : '+';
  const absolutePxValue = Math.abs(pxValue);

  return `calc(${emValue}em ${operator} ${absolutePxValue}px)`;
}

// Generate CSS code
function generateCSS(scalingType) {
  const option = SCALING_OPTIONS[scalingType === 'static' ? 'static' : scalingMode.value];
  const supPosition = supPositionSlider.value;
  const subPosition = subPositionSlider.value;
  const formulaComment = scalingType === 'static' ? '' : `
  /* Formula: Superscript/Subscript Position × Browser's default sup/sub scaling factor (${BROWSER_SMALLER}) × Parent Font Size (${option.multiplier} × (1em - ${option.offset}px)) */`;

  return `sup, sub {
  position: relative;
  vertical-align: baseline;
}

sup {
  font-size: ${option.formula};${formulaComment}
  top: ${calculateTopPosition(supPosition, scalingType)};
}

sub {
  font-size: ${option.formula};${formulaComment}
  top: ${calculateTopPosition(subPosition, scalingType)};
}`;
}

// Update scaling mode dropdown based on scaling type
function updateScalingModeDropdown(scalingType) {
  if (scalingType === 'static') {
    scalingMode.innerHTML = '<option value="static">Default</option>';
    scalingMode.disabled = true;
  } else {
    scalingMode.innerHTML = `
      <option value="fluidLarger">Larger</option>
      <option value="fluidDefault" selected>Default</option>
      <option value="fluidSmaller">Smaller</option>
    `;
    scalingMode.disabled = false;
  }
}

// Update display
function updateDisplay() {
  const fontSize = fontSizeSlider.value;
  const scalingType = document.querySelector('input[name="scalingType"]:checked').value;
  const supPosition = supPositionSlider.value;
  const subPosition = subPositionSlider.value;
  
  // Update display values
  fontSizeValue.textContent = fontSize;
  supPositionValue.textContent = supPosition;
  subPositionValue.textContent = subPosition;
  
  // Update text display
  textDisplay.style.fontSize = `${fontSize}px`;
  
  // Update sup/sub styles
  const option = SCALING_OPTIONS[scalingType === 'static' ? 'static' : scalingMode.value];
  
  [sup, sub].forEach(elem => {
    elem.style.fontSize = option.formula;
  });
  
  sup.style.top = calculateTopPosition(supPosition, scalingType);
  sub.style.top = calculateTopPosition(subPosition, scalingType);

  // Update CSS display
  currentCSS.textContent = generateCSS(scalingType);
}

// Event listeners
[fontSizeSlider, scalingMode, supPositionSlider, subPositionSlider].forEach(
  elem => elem.addEventListener('input', updateDisplay)
);

scalingTypeRadios.forEach(radio => {
  radio.addEventListener('change', (e) => {
    updateScalingModeDropdown(e.target.value);
    updateDisplay();
  });
});

// Initial update
updateDisplay();