Agent skill

Visual Designer

Design beautiful, consistent user interfaces with proper color theory, typography, spacing, and visual hierarchy. Use when creating design systems, choosing colors and fonts, or establishing visual direction. Covers color theory, typography scales, spacing systems, and design principles.

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SKILL.md

Visual Designer

Great design is invisible - users notice when it's bad, not when it's good.

Core Principle

Consistency over creativity.

Visual design serves the user experience. Every color, font, and spacing decision should have a purpose.

Phase 1: Color Systems

Color Theory Basics

Color Wheel:

Complementary: Opposite colors (blue + orange) - high contrast
Analogous: Adjacent colors (blue + green + teal) - harmonious
Triadic: Three evenly spaced colors - balanced
Monochromatic: Shades of one color - safe, minimal

Creating a Color Palette

60-30-10 Rule:

60% Primary color (dominant)
30% Secondary color (supporting)
10% Accent color (call-to-action)

Example Palette:

css

/* Primary (60%) - Backgrounds, large areas */
--color-primary-50: #eff6ff;
--color-primary-100: #dbeafe;
--color-primary-200: #bfdbfe;
--color-primary-500: #3b82f6; /* Main brand color */
--color-primary-600: #2563eb;
--color-primary-900: #1e3a8a;

/* Secondary (30%) - Complementary elements */
--color-secondary-500: #8b5cf6;
--color-secondary-600: #7c3aed;

/* Accent (10%) - CTAs, highlights */
--color-accent-500: #f59e0b;
--color-accent-600: #d97706;

/* Neutrals - Text, borders */
--color-gray-50: #f9fafb;
--color-gray-100: #f3f4f6;
--color-gray-300: #d1d5db;
--color-gray-500: #6b7280;
--color-gray-700: #374151;
--color-gray-900: #111827;

/* Semantic colors */
--color-success: #10b981;
--color-warning: #f59e0b;
--color-error: #ef4444;
--color-info: #3b82f6;

Accessible Color Contrast

WCAG Requirements:

Normal text (< 18pt): 4.5:1 contrast ratio
Large text (≥ 18pt or 14pt bold): 3:1 contrast ratio
UI components: 3:1 contrast ratio

css

/* ✅ Good: Sufficient contrast (8:1) */
.text {
  color: #111827; /* gray-900 */
  background: #ffffff;
}

/* ❌ Bad: Insufficient contrast (2.1:1) */
.text-bad {
  color: #d1d5db; /* gray-300 */
  background: #ffffff;
}

Tools:

Dark Mode Strategy

css

:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --text-primary: #111827;
  --text-secondary: #6b7280;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
  }
}

Dark Mode Checklist:

Reduce pure white (#fff) → use off-white (#f9fafb)
Reduce pure black (#000) → use dark gray (#111827)
Increase contrast on dark backgrounds
Test with actual dark mode users
Support system preference

Phase 2: Typography

Font Pairing Principles

Golden Rule: Maximum 2 fonts

Heading font: Distinctive, attention-grabbing
Body font: Readable, neutral

Popular Pairings:

css

/* Modern & Clean */
--font-heading: 'Inter', sans-serif;
--font-body: 'Inter', sans-serif;

/* Classic & Professional */
--font-heading: 'Playfair Display', serif;
--font-body: 'Source Sans Pro', sans-serif;

/* Tech & Minimal */
--font-heading: 'Space Grotesk', sans-serif;
--font-body: 'IBM Plex Sans', sans-serif;

/* Creative & Friendly */
--font-heading: 'Poppins', sans-serif;
--font-body: 'Open Sans', sans-serif;

Type Scale (Modular Scale)

Base size: 16px (1rem) Scale ratio: 1.25 (Major Third)

css

--text-xs: 0.64rem; /* 10.24px */
--text-sm: 0.8rem; /* 12.8px */
--text-base: 1rem; /* 16px */
--text-lg: 1.25rem; /* 20px */
--text-xl: 1.563rem; /* 25px */
--text-2xl: 1.953rem; /* 31.25px */
--text-3xl: 2.441rem; /* 39px */
--text-4xl: 3.052rem; /* 48.83px */
--text-5xl: 3.815rem; /* 61px */

/* Font weights */
--font-normal: 400;
--font-medium: 500;
--font-semibold: 600;
--font-bold: 700;

Line Height & Spacing

css

/* Headings: Tighter line-height */
h1,
h2,
h3 {
  line-height: 1.2;
}

/* Body text: Comfortable reading */
p {
  line-height: 1.6;
  max-width: 65ch; /* 65 characters max for readability */
}

/* Small text: More line-height */
.text-sm {
  line-height: 1.8;
}

/* Letter spacing */
.heading {
  letter-spacing: -0.02em; /* Tighter */
}

.uppercase {
  letter-spacing: 0.05em; /* Wider for all-caps */
}

Responsive Typography

css

/* Fluid typography */
h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
}

/* Or breakpoint-based */
h1 {
  font-size: 2rem;
}

@media (min-width: 768px) {
  h1 {
    font-size: 3rem;
  }
}

@media (min-width: 1024px) {
  h1 {
    font-size: 3.5rem;
  }
}

Phase 3: Spacing System

8pt Grid System

Why 8pt?

Most screens are divisible by 8
Creates visual rhythm
Easier to maintain consistency

css

--space-1: 0.25rem; /* 4px */
--space-2: 0.5rem; /* 8px */
--space-3: 0.75rem; /* 12px */
--space-4: 1rem; /* 16px */
--space-5: 1.25rem; /* 20px */
--space-6: 1.5rem; /* 24px */
--space-8: 2rem; /* 32px */
--space-10: 2.5rem; /* 40px */
--space-12: 3rem; /* 48px */
--space-16: 4rem; /* 64px */
--space-20: 5rem; /* 80px */
--space-24: 6rem; /* 96px */

Usage:

css

/* Component padding */
.button {
  padding: var(--space-3) var(--space-6); /* 12px 24px */
}

/* Section spacing */
.section {
  padding: var(--space-16) 0; /* 64px top/bottom */
}

/* Element margins */
.heading {
  margin-bottom: var(--space-4); /* 16px */
}

.paragraph {
  margin-bottom: var(--space-6); /* 24px */
}

Vertical Rhythm

css

/* Consistent vertical spacing */
* + * {
  margin-top: var(--space-4);
}

/* Specific overrides */
h1 + p {
  margin-top: var(--space-6);
}

p + p {
  margin-top: var(--space-4);
}

Phase 4: Layout & Composition

Visual Hierarchy

Establish importance through:

Size: Larger = more important
Weight: Bolder = more important
Color: Brighter = more important
Spacing: More space = more important

css

/* Primary heading */
h1 {
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-8);
}

/* Secondary heading */
h2 {
  font-size: var(--text-2xl);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

/* Body text */
p {
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

/* Supporting text */
.caption {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

Grid Systems

12-Column Grid:

css

.container {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-4);
}

/* Full width */
.col-12 {
  grid-column: span 12;
}

/* Half width */
.col-6 {
  grid-column: span 6;
}

/* Third width */
.col-4 {
  grid-column: span 4;
}

/* Responsive */
@media (max-width: 768px) {
  .col-6 {
    grid-column: span 12; /* Stack on mobile */
  }
}

Whitespace (Negative Space)

css

/* ❌ Cramped */
.card-bad {
  padding: 8px;
}

/* ✅ Breathing room */
.card-good {
  padding: var(--space-8); /* 32px */
}

/* Content spacing */
.content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4); /* Side padding */
}

Responsive Breakpoints

css

/* Mobile first */
:root {
  --breakpoint-sm: 640px; /* Small devices */
  --breakpoint-md: 768px; /* Tablets */
  --breakpoint-lg: 1024px; /* Laptops */
  --breakpoint-xl: 1280px; /* Desktops */
  --breakpoint-2xl: 1536px; /* Large screens */
}

/* Usage */
@media (min-width: 768px) {
  .container {
    padding: var(--space-8);
  }
}

Phase 5: Visual Polish

Shadows & Elevation

css

/* Elevation levels */
--shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
--shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
--shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
--shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);

/* Usage */
.card {
  box-shadow: var(--shadow-md);
  transition: box-shadow 0.2s;
}

.card:hover {
  box-shadow: var(--shadow-lg);
}

Border Radius

css

--radius-sm: 0.25rem; /* 4px - small elements */
--radius-md: 0.5rem; /* 8px - buttons, inputs */
--radius-lg: 0.75rem; /* 12px - cards */
--radius-xl: 1rem; /* 16px - modals */
--radius-full: 9999px; /* Fully rounded */

/* Usage */
.button {
  border-radius: var(--radius-md);
}

.avatar {
  border-radius: var(--radius-full);
}

Transitions & Animations

css

/* Transition timing */
--transition-fast: 150ms;
--transition-base: 200ms;
--transition-slow: 300ms;

/* Easing functions */
--ease-in: cubic-bezier(0.4, 0, 1, 1);
--ease-out: cubic-bezier(0, 0, 0.2, 1);
--ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);

/* Button hover */
.button {
  transition: all var(--transition-base) var(--ease-in-out);
}

.button:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

/* Fade in */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.fade-in {
  animation: fadeIn var(--transition-slow) var(--ease-out);
}

Design Principles

1. Contrast

Create clear distinction between elements

css

/* ✅ Good contrast */
.hero {
  background: var(--color-primary-600);
  color: white;
}

/* ❌ Poor contrast */
.hero-bad {
  background: #ddd;
  color: #aaa;
}

2. Alignment

Align elements to create order

css

/* ✅ Aligned */
.container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

3. Repetition

Repeat visual elements for consistency

css

/* Consistent button styles */
.button {
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-weight: var(--font-semibold);
}

4. Proximity

Group related elements

css

/* Form fields grouped */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

Component Design Patterns

Buttons

css

/* Primary button */
.btn-primary {
  background: var(--color-primary-600);
  color: white;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-weight: var(--font-semibold);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
}

.btn-primary:hover {
  background: var(--color-primary-700);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* Secondary button */
.btn-secondary {
  background: transparent;
  color: var(--color-primary-600);
  border: 2px solid var(--color-primary-600);
}

/* Ghost button */
.btn-ghost {
  background: transparent;
  color: var(--text-primary);
}

.btn-ghost:hover {
  background: var(--color-gray-100);
}

Cards

css

.card {
  background: white;
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

Forms

css

.input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 2px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  transition: border-color var(--transition-base);
}

.input:focus {
  outline: none;
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.input:invalid {
  border-color: var(--color-error);
}

Design Tools

Color Tools

Coolors - Generate palettes
Color Hunt - Curated palettes
Adobe Color - Color wheel
Contrast Checker

Typography Tools

Google Fonts
Font Pair - Font combinations
Type Scale - Generate type scales

Design Systems

Tailwind CSS - Utility-first CSS
Radix Colors - Color system
Open Color - Color scheme

Visual Design Checklist

Colors

Primary, secondary, accent colors defined
Neutral grays (50-900) defined
Semantic colors (success, warning, error)
All text meets WCAG contrast requirements
Dark mode colors defined

Typography

1-2 fonts maximum
Type scale defined (8-10 sizes)
Font weights specified
Line heights set appropriately
Max-width for readability (65ch)

Spacing

8pt grid system used
Consistent spacing scale
Adequate whitespace
Vertical rhythm maintained

Components

Button styles consistent
Form inputs styled consistently
Cards have proper elevation
Hover states defined
Focus states visible

Responsive

Mobile-first approach
Breakpoints defined
Touch targets ≥ 44px
Text scales appropriately

Related Resources

Skills:

design-system-architect - Building design systems
ux-designer - User experience design
accessibility-engineer - Color contrast, readability

External:

Good design makes the product easy to use. Great design makes it disappear. 🎨

Maintainer

daffy0208 Core maintainer

Source details

Full Name: daffy0208/ai-dev-standards
Branch: main
Path in repo: skills/visual-designer
License: MIT License

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SKILL.md

Visual Designer

Core Principle

Phase 1: Color Systems

Color Theory Basics

Creating a Color Palette

Accessible Color Contrast

Dark Mode Strategy

Phase 2: Typography

Font Pairing Principles

Type Scale (Modular Scale)

Line Height & Spacing

Responsive Typography

Phase 3: Spacing System

8pt Grid System

Vertical Rhythm

Phase 4: Layout & Composition

Visual Hierarchy

Grid Systems

Whitespace (Negative Space)

Responsive Breakpoints

Phase 5: Visual Polish

Shadows & Elevation

Border Radius

Transitions & Animations

Design Principles

1. Contrast

2. Alignment

3. Repetition

4. Proximity

Component Design Patterns

Buttons

Cards

Forms

Design Tools

Color Tools

Typography Tools

Design Systems

Visual Design Checklist

Colors

Typography

Spacing

Components

Responsive

Related Resources

Recommended Agent Skills

Deployment Advisor

mobile-developer

Knowledge Base Manager

video-producer

API Designer

api-integration-builder