Accessible Data Visualization: Charts and Graphs for All Users

Design an accessible data visualization system for [PRODUCT NAME]'s dashboards and reports.\\\\\\\\n\\\\\\\\n**Color and Pattern Strategy:**\\\\\\\\n- Color palette: colorblind-safe (tested for protanopia, deuteranopia, tritanopia)\\\\\\\\n- Pattern fills: in addition to color (stripes, dots, crosshatch)\\\\\\\\n- Direct labeling: labels on chart elements, not just legends\\\\\\\\n- Minimum contrast: 3:1 for chart elements against background\\\\\\\\n\\\\\\\\n**Screen Reader Support:**\\\\\\\\n- Data tables as alternative to every chart\\\\\\\\n- ARIA roles: img, figure, table\\\\\\\\n- Descriptive titles and summaries\\\\\\\\n- Data point announcements on focus\\\\\\\\n- Complex chart descriptions (long description)\\\\\\\\n\\\\\\\\n**Chart-Specific Guidelines:**\\\\\\\\n\\\\\\\\n1) Line charts:\\\\\\\\n- Different line styles (solid, dashed, dotted) per line\\\\\\\\n- Data point markers for each series\\\\\\\\n- Direct labels at end of lines\\\\\\\\n\\\\\\\\n2) Bar charts:\\\\\\\\n- Pattern fills for each category\\\\\\\\n- Data labels on bars\\\\\\\\n- Horizontal bars for long category names\\\\\\\\n\\\\\\\\n3) Pie/donut charts:\\\\\\\\n- Maximum 5 slices\\\\\\\\n- Direct labels with connector lines\\\\\\\\n- Alternative: bar chart for better accessibility\\\\\\\\n\\\\\\\\n4) Scatter plots:\\\\\\\\n- Different marker shapes per series\\\\\\\\n- Grid lines for value reference\\\\\\\\n- Data table alternative\\\\\\\\n\\\\\\\\n5) Heatmaps:\\\\\\\\n- Pattern + color encoding\\\\\\\\n- Value labels in each cell\\\\\\\\n- Legend with clear value ranges\\\\\\\\n\\\\\\\\n**Interaction Accessibility:**\\\\\\\\n- Keyboard navigation between chart elements\\\\\\\\n- Focus indicators on interactive elements\\\\\\\\n- Zoom and pan controls (keyboard accessible)\\\\\\\\n- Tooltips accessible via keyboard and screen reader\\\\\\\\n\\\\\\\\n**Cognitive Accessibility:**\\\\\\\\n- Simplified chart views option\\\\\\\\n- Plain language descriptions\\\\\\\\n- Progressive disclosure of complexity\\\\\\\\n- Consistent chart types across the product\\\\\\\\n\\\\\\\\nInclude code examples for accessible chart implementation in [CHARTING LIBRARY].