app/src/content/embeds/score-stack.html

<div class="d3-score-stack"></div>
<style>
  .d3-score-stack {
    width: 100%;
    margin: 10px 0;
    position: relative;
    font-family: system-ui, -apple-system, sans-serif;
  }

  .d3-score-stack svg {
    display: block;
    width: 100%;
    height: auto;
  }

  .d3-score-stack .axes path,
  .d3-score-stack .axes line {
    stroke: var(--axis-color, var(--text-color));
  }

  .d3-score-stack .axes text {
    fill: var(--tick-color, var(--muted-color));
    font-size: 11px;
  }

  .d3-score-stack .grid line {
    stroke: var(--grid-color, rgba(0,0,0,.08));
  }

  .d3-score-stack .axes text.axis-label {
    font-size: 15px;
    font-weight: 500;
    fill: var(--text-color);
  }

  .d3-score-stack .bar-segment {
    cursor: pointer;
    transition: opacity 0.15s ease;
  }

  .d3-score-stack .bar-segment:hover {
    opacity: 0.8;
  }

  .d3-score-stack .model-label {
    font-size: 12px;
    fill: var(--text-color);
  }

  .d3-score-stack .d3-tooltip {
    position: absolute;
    top: 0;
    left: 0;
    transform: translate(-9999px, -9999px);
    pointer-events: none;
    padding: 10px 12px;
    border-radius: 8px;
    font-size: 12px;
    line-height: 1.4;
    border: 1px solid var(--border-color);
    background: var(--surface-bg);
    color: var(--text-color);
    box-shadow: 0 4px 24px rgba(0,0,0,.18);
    opacity: 0;
    transition: opacity 0.12s ease;
    z-index: 10;
  }

  .d3-score-stack .d3-tooltip .model-name {
    font-weight: 600;
    margin-bottom: 4px;
  }

  .d3-score-stack .d3-tooltip .metric {
    display: flex;
    justify-content: space-between;
    gap: 16px;
  }

  .d3-score-stack .d3-tooltip .metric-label {
    color: var(--muted-color);
  }

  .d3-score-stack .d3-tooltip .metric-value {
    font-weight: 500;
  }

  .d3-score-stack .legend {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
    margin-top: 12px;
    font-size: 12px;
  }

  .d3-score-stack .legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
  }

  .d3-score-stack .legend-swatch {
    width: 14px;
    height: 14px;
    border-radius: 2px;
  }

  .d3-score-stack .legend-label {
    color: var(--text-color);
  }
</style>
<script>
  (() => {
    const ensureD3 = (cb) => {
      if (window.d3 && typeof window.d3.select === 'function') return cb();
      let s = document.getElementById('d3-cdn-script');
      if (!s) {
        s = document.createElement('script');
        s.id = 'd3-cdn-script';
        s.src = 'https://cdn.jsdelivr.net/npm/d3@7/dist/d3.min.js';
        document.head.appendChild(s);
      }
      const onReady = () => { if (window.d3 && typeof window.d3.select === 'function') cb(); };
      s.addEventListener('load', onReady, { once: true });
      if (window.d3) onReady();
    };

    const bootstrap = () => {
      const scriptEl = document.currentScript;
      let container = scriptEl ? scriptEl.previousElementSibling : null;
      if (!(container && container.classList && container.classList.contains('d3-score-stack'))) {
        const candidates = Array.from(document.querySelectorAll('.d3-score-stack'))
          .filter((el) => !(el.dataset && el.dataset.mounted === 'true'));
        container = candidates[candidates.length - 1] || null;
      }
      if (!container) return;
      if (container.dataset) {
        if (container.dataset.mounted === 'true') return;
        container.dataset.mounted = 'true';
      }

      // Tooltip setup
      container.style.position = container.style.position || 'relative';
      const tip = document.createElement('div');
      tip.className = 'd3-tooltip';
      container.appendChild(tip);

      // SVG setup
      const svg = d3.select(container).append('svg');
      const gRoot = svg.append('g');

      // Chart groups
      const gGrid = gRoot.append('g').attr('class', 'grid');
      const gAxes = gRoot.append('g').attr('class', 'axes');
      const gBars = gRoot.append('g').attr('class', 'bars');

      // Legend container
      const legendDiv = document.createElement('div');
      legendDiv.className = 'legend';
      container.appendChild(legendDiv);

      // State
      let data = null;
      let width = 800;
      let height = 500;
      const margin = { top: 20, right: 30, bottom: 56, left: 160 };

      // Colors for segments
      const segmentColors = {
        floored: '#afb2c5',   // Gray - floored score
        noStakes: '#34b31e'   // Green - no-stakes gain
      };

      // Scales
      const xScale = d3.scaleLinear();
      const yScale = d3.scaleBand();

      // Data loading
      const DATA_URL = '/data/score_stack.json';

      function updateSize() {
        width = container.clientWidth || 800;
        const barCount = data ? data.models.length : 10;
        height = Math.max(400, barCount * 44 + margin.top + margin.bottom);
        svg.attr('width', width).attr('height', height).attr('viewBox', `0 0 ${width} ${height}`);
        gRoot.attr('transform', `translate(${margin.left},${margin.top})`);
        return {
          innerWidth: width - margin.left - margin.right,
          innerHeight: height - margin.top - margin.bottom
        };
      }

      function showTooltip(event, d, segment) {
        const rect = container.getBoundingClientRect();
        const x = event.clientX - rect.left;
        const y = event.clientY - rect.top;

        let segmentName, segmentValue, description;
        if (segment === 'floored') {
          segmentName = 'Score';
          segmentValue = d.avg_floored_score.toFixed(2);
          description = 'Floored score (negative scores count as 0)';
        } else {
          segmentName = 'No-Stakes Gain';
          segmentValue = '+' + d.no_stakes_delta.toFixed(2);
          description = 'Additional gain without guess penalties';
        }

        tip.innerHTML = `
          <div class="model-name" style="color: ${d.color}">${d.name}</div>
          <div class="metric">
            <span class="metric-label">${segmentName}:</span>
            <span class="metric-value">${segmentValue}</span>
          </div>
          <div style="font-size: 11px; color: var(--muted-color); margin-top: 4px;">${description}</div>
          <hr style="border: none; border-top: 1px solid var(--border-color); margin: 8px 0;">
          <div class="metric">
            <span class="metric-label">Score:</span>
            <span class="metric-value">${d.avg_floored_score.toFixed(2)}</span>
          </div>
          <div class="metric">
            <span class="metric-label">No-Stakes Score:</span>
            <span class="metric-value">${d.avg_no_stakes_score.toFixed(2)}</span>
          </div>
        `;

        const tipWidth = tip.offsetWidth || 200;
        const tipHeight = tip.offsetHeight || 150;
        let tipX = x + 12;
        let tipY = y - tipHeight / 2;

        if (tipX + tipWidth > width) tipX = x - tipWidth - 12;
        if (tipY < 0) tipY = 8;
        if (tipY + tipHeight > height) tipY = height - tipHeight - 8;

        tip.style.transform = `translate(${tipX}px, ${tipY}px)`;
        tip.style.opacity = '1';
      }

      function hideTooltip() {
        tip.style.opacity = '0';
        tip.style.transform = 'translate(-9999px, -9999px)';
      }

      function render() {
        if (!data) return;

        const { innerWidth, innerHeight } = updateSize();

        // Sort models by floored score (descending)
        const models = [...data.models].sort((a, b) => b.avg_floored_score - a.avg_floored_score);

        // Update scales
        const maxScore = d3.max(models, d => d.avg_no_stakes_score);

        xScale
          .domain([0, maxScore + 1])
          .range([0, innerWidth])
          .nice();

        yScale
          .domain(models.map(d => d.name))
          .range([0, innerHeight])
          .padding(0.25);

        // Grid lines
        const xTicks = xScale.ticks(8);

        gGrid.selectAll('.grid-x')
          .data(xTicks)
          .join('line')
          .attr('class', 'grid-x')
          .attr('x1', d => xScale(d))
          .attr('x2', d => xScale(d))
          .attr('y1', 0)
          .attr('y2', innerHeight);

        // Axes
        const tickSize = 6;
        gAxes.selectAll('.x-axis')
          .data([0])
          .join('g')
          .attr('class', 'x-axis')
          .attr('transform', `translate(0,${innerHeight})`)
          .call(d3.axisBottom(xScale).ticks(8).tickSizeInner(-tickSize).tickSizeOuter(0));

        gAxes.selectAll('.y-axis')
          .data([0])
          .join('g')
          .attr('class', 'y-axis')
          .call(d3.axisLeft(yScale).tickSize(0))
          .selectAll('text')
          .attr('class', 'model-label');

        // Axis label
        gAxes.selectAll('.x-label')
          .data([0])
          .join('text')
          .attr('class', 'x-label axis-label')
          .attr('x', innerWidth / 2)
          .attr('y', innerHeight + 44)
          .attr('text-anchor', 'middle')
          .text('Score');

        const barHeight = yScale.bandwidth();

        // Helper to sanitize names for CSS selectors (remove periods, spaces, etc.)
        const toClassName = (name) => name.replace(/[^a-zA-Z0-9]/g, '-');

        // Draw stacked bars for each model
        models.forEach(d => {
          const y = yScale(d.name);
          const safeId = toClassName(d.name);

          // Calculate segment positions
          // Floored score starts from 0
          const flooredStart = 0;
          const flooredEnd = d.avg_floored_score;

          // No-stakes delta starts where floored ends
          const noStakesStart = flooredEnd;
          const noStakesEnd = noStakesStart + d.no_stakes_delta;

          // Floored score segment (base)
          gBars.selectAll(`.bar-floored-${safeId}`)
            .data([d])
            .join('rect')
            .attr('class', `bar-segment bar-floored-${safeId}`)
            .attr('x', xScale(flooredStart))
            .attr('y', y)
            .attr('width', Math.max(0, xScale(flooredEnd) - xScale(flooredStart)))
            .attr('height', barHeight)
            .attr('fill', segmentColors.floored)
            .on('mouseenter', (e) => showTooltip(e, d, 'floored'))
            .on('mousemove', (e) => showTooltip(e, d, 'floored'))
            .on('mouseleave', hideTooltip);

          // No-stakes delta segment (only if positive)
          if (d.no_stakes_delta > 0.01) {
            gBars.selectAll(`.bar-nostakes-${safeId}`)
              .data([d])
              .join('rect')
              .attr('class', `bar-segment bar-nostakes-${safeId}`)
              .attr('x', xScale(noStakesStart))
              .attr('y', y)
              .attr('width', Math.max(0, xScale(noStakesEnd) - xScale(noStakesStart)))
              .attr('height', barHeight)
              .attr('fill', segmentColors.noStakes)
              .attr('opacity', 0.5)
              .on('mouseenter', (e) => showTooltip(e, d, 'noStakes'))
              .on('mousemove', (e) => showTooltip(e, d, 'noStakes'))
              .on('mouseleave', hideTooltip);
          }
        });

        // Update legend
        legendDiv.innerHTML = `
          <div class="legend-item">
            <div class="legend-swatch" style="background: ${segmentColors.floored}"></div>
            <span class="legend-label">Score</span>
          </div>
          <div class="legend-item">
            <div class="legend-swatch" style="background: ${segmentColors.noStakes}"></div>
            <span class="legend-label">No-Stakes Gain</span>
          </div>
        `;
      }

      // Initialize
      fetch(DATA_URL, { cache: 'no-cache' })
        .then(r => r.json())
        .then(json => {
          data = json;
          render();
        })
        .catch(err => {
          const pre = document.createElement('pre');
          pre.style.color = 'red';
          pre.style.padding = '16px';
          pre.textContent = `Error loading data: ${err.message}`;
          container.appendChild(pre);
        });

      // Resize handling
      if (window.ResizeObserver) {
        new ResizeObserver(() => render()).observe(container);
      } else {
        window.addEventListener('resize', render);
      }

      // Theme change handling
      const observer = new MutationObserver(() => render());
      observer.observe(document.documentElement, {
        attributes: true,
        attributeFilter: ['data-theme']
      });
    };

    if (document.readyState === 'loading') {
      document.addEventListener('DOMContentLoaded', () => ensureD3(bootstrap), { once: true });
    } else {
      ensureD3(bootstrap);
    }
  })();
</script>