Style Guide for Data Visualization AI Prompt

Create a data visualization style guide for this organization.

Organization: {{organization}}
Brand colors: {{brand_colors}}
Primary tools: {{tools}}
Typography system: {{typography}}
Audience for the style guide: {{audience}} (data analysts, developers, designers)

A style guide ensures all visualizations across the organization look coherent, communicate clearly, and meet accessibility standards.

1. Color system:
   PRIMARY PALETTE (for data encoding):
   - Primary: {{primary_color}} — use for the most important series or highlight
   - Secondary: 3–5 supporting colors for categorical series
   - Neutral: grey scale for non-data elements (axes, gridlines, background text)
   - Alert: one red/orange for negative values or warnings

   SEQUENTIAL PALETTES:
   - Single-hue: light-to-dark of the primary color
   - Multi-hue: define the start and end color (perceptually uniform progression)

   DIVERGING PALETTES:
   - Define: negative color, neutral midpoint color, positive color

   RULES:
   - Maximum 8 colors in any single chart
   - Never use color as the only encoding (add labels, patterns, or shapes)
   - All palettes must pass colorblind-safe test

2. Typography:
   - Chart title: {{heading_font}}, {{title_size}}pt, bold
   - Axis labels: {{body_font}}, 11pt, regular
   - Data labels: {{body_font}}, 10pt, regular
   - Annotations: {{body_font}}, 10pt, italic
   - Numbers: use tabular figures (all same width) for alignment in tables

3. Chart formatting standards:
   - Minimum chart width: 480px (for web); 3 inches (for print)
   - Minimum height: 60% of width for most charts
   - Background: white (#FFFFFF) or transparent
   - Gridlines: horizontal only, light grey (#E0E0E0), 0.5pt
   - No chart borders or shadows
   - Axis lines: left axis only (y-axis), light grey, 0.5pt
   - Tick marks: none unless necessary

4. Chart title standards:
   - Format: insight statement (not a label)
   - Length: 1 line maximum for presentation; 2 lines for reports
   - Capitalization: sentence case (not title case)
   - No period at end of title

5. Number formatting:
   - Revenue: $1.2M (> $1M), $456K (> $1K), $123 (< $1K)
   - Percentages: 23.4% (1 decimal), 100% (no decimal)
   - Counts: comma separator every 3 digits
   - Dates: 'Jan 2024' for months, 'Q1 2024' for quarters, '2024' for years
   - Ratios: 2.3× (not 2.3x)

6. Template files:
   - Provide: Tableau workbook template, Power BI template file, Python rcParams settings

Return: complete style guide document with all specifications, hex codes, template settings for each tool, and a one-page quick reference card.