Design

Design System (Core)

Quick Decision

UI element or data visualization?

• UI Element → Brand Colors (#0176D3, #032D60)
• Data Visualization → Data Colors (#33BBEE, #0077BB, sequence)

Never mix brand and data colors in same context.

Brand Colors (UI Only)

--tableau-blue: #0176D3;       /* Primary CTA */
--tableau-navy: #032D60;       /* Headings, nav */
--tableau-green: #00A651;      /* Success */
--tableau-bg-light: #EAF5FE;   /* Backgrounds */
--tableau-text: #333333;       /* Body text */
--tableau-border: #EBEBEB;     /* Borders */

Data Colors (Charts Only)

--data-1: #33BBEE;  /* Primary cyan */
--data-2: #0077BB;  /* Primary blue */
--data-3: #66CCEE;  /* Light cyan */
--data-4: #4477AA;  /* Light blue */
--data-5: #44AA99;  /* Teal */
--data-error: #EE6677;  /* Red (errors) */
--data-neutral: #BBBBBB; /* Grey (baseline) */

Sequence: ['#33BBEE', '#0077BB', '#66CCEE', '#4477AA', '#44AA99']

Typography

--font-heading: 'Space Grotesk', sans-serif;
--font-body: 'Inter', sans-serif;
--font-code: 'Fira Code', monospace;

--text-hero: 2.25rem;   /* 36px */
--text-h1: 1.875rem;    /* 30px */
--text-h2: 1.5rem;      /* 24px */
--text-body: 1rem;      /* 16px */
--text-small: 0.875rem; /* 14px */

Spacing

--space-2: 0.5rem;   /* 8px */
--space-4: 1rem;     /* 16px */
--space-6: 1.5rem;   /* 24px */
--space-8: 2rem;     /* 32px - card padding */
--space-12: 3rem;    /* 48px - section gap */

Shadows (Dual-Layer)

--shadow-sm: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.1);
--shadow-md: 0 4px 6px rgba(0,0,0,0.1), 0 2px 4px rgba(0,0,0,0.1);
--shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);

Component Patterns

Button (Brand)

.btn-primary {
  background: var(--tableau-blue);
  color: white;
  padding: 14px 32px;
  border-radius: 6px;
}
.btn-primary:hover { transform: translateY(-2px); }

Card (Brand)

.card {
  background: white;
  border: 1px solid var(--tableau-border);
  border-radius: 16px;
  padding: var(--space-8);
  box-shadow: var(--shadow-sm);
}

Data Card (Data Colors)

.data-card {
  border-top: 4px solid var(--data-1);
}
.data-card__value {
  color: var(--data-2);
  font-size: var(--text-h1);
  font-family: var(--font-heading);
}

Chart.js Setup

const chartColors = ['#33BBEE', '#0077BB', '#66CCEE', '#4477AA', '#44AA99'];

new Chart(ctx, {
  data: {
    datasets: [
      { backgroundColor: chartColors[0] },
      { backgroundColor: chartColors[1] }
    ]
  },
  options: {
    plugins: {
      legend: { labels: { color: '#333333' } } // Brand for UI
    }
  }
});

Accessibility

• Contrast: 4.5:1 minimum (WCAG AA)
• Focus: 3px outline, brand blue
• Touch: 44x44px minimum targets

Extended Reference

For philosophy and full implementation details:

• Philosophy: skills/design/philosophy.md
• Full implementation: skills/design/implementation.md

Version: 3.0.0

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