d3js sankey dark dashboard infographic pipeline trend

Data visualization infographic titled "Tree Map Example" using a SANKEY FLOW as the dominant visual element to show trend over stages in a pipeline. Create a dark dashboard composition with FT pink and navy palette: deep navy background, Financial Times-inspired soft pink flows, muted coral highlights, pale gray gridlines, white and light-sand typography for contrast. Use editorial data journalism illustration, FT / Bloomberg-grade chart aesthetics, vector-clean infographic layout. 

Main chart: a large left-to-right sankey pipeline with 5 sequential stages labeled in English exactly as: "Stage 1", "Stage 2", "Stage 3", "Stage 4", "Stage 5". Add a clear horizontal scale above or below the flow with sharp tick marks labeled exactly: "Q1", "Q2", "Q3", "Q4", "Q5" to reinforce the trend-over-time angle. Add a vertical reference scale on the left labeled exactly "Illustrative volume" with tick marks at 0, 20, 40, 60, 80, 100. Ensure no misleading axis truncation or scale manipulation. 

Flow structure with realistic plausible illustrative numbers, visibly labeled as illustrative in the chart notes: from "Stage 1" total 100 units split into "Core Segment" 58, "Growth Segment" 27, "Long Tail" 15; at "Stage 2" flows become 54, 30, 16; at "Stage 3" 49, 34, 17; at "Stage 4" 45, 38, 17; at "Stage 5" 41, 42, 17. Use width changes to show trend: core declines, growth rises, long tail stays stable. Include crisp node labels and small numeric labels on major flows exactly as: "58", "27", "15", "54", "30", "16", "49", "34", "17", "45", "38", "17", "41", "42", "17". Add a small legend in English exactly: "Core Segment", "Growth Segment", "Long Tail".

Add 4 key insight callouts around the chart, each with a headline number, a short interpretation in English, and a small icon: 1) headline "-17" with caption exactly "Core Segment declines from 58 to 41" and a small down-arrow icon; 2) headline "+15" with caption exactly "Growth Segment rises from 27 to 42" and a small upward-trend icon; 3) headline "17" with caption exactly "Long Tail remains stable across later stages" and a small balance icon; 4) headline "Q4" with caption exactly "Crossover begins as Growth Segment nearly matches Core Segment" and a small alert/star icon. 

Include a compact title deck and subtitle in English exactly: title "Tree Map Example" and subtitle "Illustrative sankey pipeline showing segment trend over stages". Add a small source / data-note strip at the bottom in English exactly: "Data note: Illustrative example only. Figures are plausible mock values unless user-supplied sourced data is provided." 

Overall mood: analytical, premium newsroom dashboard, high contrast, polished, modern, precise, information-dense but uncluttered. Sharp axis labels and tick marks, clean spacing, balanced annotations, subtle panel borders, no decorative clutter. All text MUST be written in English (array). Every heading, label, caption, legend and metric name in the image must be in English — not English. Spell each English word correctly using English characters and diacritics. Numbers stay as digits, no fake authoritative sources cited, no watermarks Numbers labeled "illustrative" unless the user supplied specific sourced data. No fake authoritative sources cited (do not invent "Source: Reuters 2025" — use "Illustrative example" instead). No misleading axis truncation or scale manipulation.