Web Design

# Web Design Patterns

CSS implementation patterns for production-grade interfaces. For design fundamentals and decision-making, see `ui-design`. This skill focuses on code.

> See also: `ui-design` for typography/color/spacing theory, `frontend-design` for creative aesthetics.

Installation

OpenClaw / Moltbot / Clawbot

```bash npx clawhub@latest install web-design ```

Layout Principles

Use CSS Grid for two-dimensional layouts and Flexbox for one-dimensional flow. Choose the right tool for each context.

| Layout Need | Tool | Why | |---|---|---| | Page-level structure | CSS Grid (`grid-template-areas`) | Named regions, explicit row/column control | | Navigation bars | Flexbox | Single-axis alignment, spacing with `gap` | | Card grids | Grid (`auto-fill` / `auto-fit`) | Responsive without media queries | | Centering | Grid (`place-items: center`) | Shortest, most reliable centering | | Sidebar + content | Grid (`grid-template-columns: 250px 1fr`) | Proportional sizing with fixed sidebar | | Stacking overlaps | Grid + `grid-area: 1/1` | Layer elements without `position: absolute` |

Spatial Composition

Go beyond predictable layouts. Intentional asymmetry, overlapping elements, and grid-breaking accents create visual interest. Use grid stacking (`grid-area: 1/1`) instead of `position: absolute` for overlapping elements. Choose generous negative space for luxury/editorial aesthetics, or controlled density for data-rich interfaces — the choice must be intentional.

Typography

Typography carries 90% of a design's personality. Choose fonts that match the interface's purpose.

| Context | Display Font Direction | Body Font Direction | Example Pairing | |---|---|---|---| | Editorial / magazine | High-contrast serif | Neutral humanist sans | Playfair Display + Source Sans 3 | | SaaS dashboard | Geometric sans | Matching weight sans | DM Sans + DM Mono (data) | | Creative portfolio | Expressive display | Clean readable sans | Syne + Outfit | | E-commerce luxury | Thin modern serif | Elegant sans | Cormorant Garamond + Jost | | Developer tooling | Monospace display | Monospace body | JetBrains Mono + IBM Plex Mono |

Type Scale

Use a consistent ratio. A 1.25 (major third) scale works for most interfaces: `text-xs` 0.64rem, `text-sm` 0.8rem, `text-base` 1rem, `text-lg` 1.25rem, `text-xl` 1.563rem, `text-2xl` 1.953rem, `text-3xl` 2.441rem, `text-4xl` 3.052rem. Set body text to `1rem` (16px minimum), line-height `1.5` for body, `1.1–1.2` for headings. Limit line length to `60–75ch`.

Color

Building a Palette

Every palette needs five functional roles:

| Role | Purpose | Example Usage | |---|---|---| | Primary | Brand identity, primary actions | Buttons, links, active states | | Neutral | Text, borders, backgrounds | Body text, cards, dividers | | Accent | Secondary actions, highlights | Tags, badges, secondary buttons | | Success / Warning / Error | Semantic feedback | Toasts, form validation, status | | Surface | Layered backgrounds | Cards on page, modals on overlay |

Contrast and Depth

Create depth through surface layering, not just shadows:

```css :root { --surface-0: hsl(220 15% 8%); /* page background */ --surface-1: hsl(220 15% 12%); /* card */ --surface-2: hsl(220 15% 16%); /* raised element */ --surface-3: hsl(220 15% 20%); /* popover / modal */ } ```

Use HSL or OKLCH for perceptually uniform color manipulation. Dominant color with sharp accents outperforms evenly-distributed palettes. Always verify WCAG contrast: 4.5:1 for normal text, 3:1 for large text.

Spacing

Consistent spacing creates rhythm. Use an 8px base unit (or 4px for dense UIs):

| Token | Value | Use | |---|---|---| | `--space-1` | 0.25rem (4px) | Inline icon gaps, tight padding | | `--space-2` | 0.5rem (8px) | Input padding, compact lists | | `--space-3` | 0.75rem (12px) | Button padding, card inner spacing | | `--space-4` | 1rem (16px) | Default element spacing | | `--space-6` | 1.5rem (24px) | Section padding, card gaps | | `--space-8` | 2rem (32px) | Section separation | | `--space-12` | 3rem (48px) | Major section breaks | | `--space-16` | 4rem (64px) | Page-level vertical rhythm |

Apply spacing consistently: use `gap` on Grid/Flexbox containers instead of margins on children. This eliminates margin-collapse bugs and simplifies responsive adjustments.

Visual Hierarchy

Guide the eye through deliberate contrast in size, weight, color, and space.

Hierarchy Techniques

| Technique | How | Impact | |---|---|---| | Size contrast | Hero heading 3–4x body size | Immediate focal point | | Weight contrast | Bold headings + regular body | Scannability | | Color contrast | Primary text vs muted secondary | Information layering | | Spatial grouping | Tight spacing within groups, wide between | Gestalt proximity | | Elevation | Shadows / surface layers | Interactive affordance | | Whitespace isolation | Empty space around key element | Emphasis through absence |

Practical Pattern — Card Hierarchy

Layer hierarchy within cards: eyebrow (xs, uppercase, muted) → title (xl, semibold) → body (base, secondary color, 1.6 line-height) → action (spaced apart with `margin-top`). Use surface color for separation and consistent padding from spacing tokens.

Responsive Design

Breakpoint Strategy

| Breakpoint | Target | Approach | |---|---|---| | `< 640px` | Mobile | Single column, stacked navigation, touch targets ≥ 44px | | `640–1024px` | Tablet | Two-column options, collapsible sidebars | | `1024–1440px` | Desktop | Full layout, hover interactions enabled | | `> 1440px` | Wide | Max-width container (1280px), prevent ultra-wide line lengths |

Fluid Techniques

Prefer fluid sizing over rigid breakpoints where possible:

```css /* Fluid typography — scales between 640px and 1440px viewport */ h1 { font-size: clamp(2rem, 1.5rem + 2.5vw, 3.5rem); }

/* Fluid spacing */ section { padding-block: clamp(2rem, 1rem + 4vw, 6rem); }

/* Intrinsic grid — no media queries needed */ .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr)); gap: var(--space-6); } ```

Use container queries (`@container`) for component-level responsiveness when a component's layout should respond to its container, not the viewport.

Accessibility

Accessibility is not optional. Build it in from the start.

| Requirement | Implementation | Standard | |---|---|---| | Color contrast | 4.5:1 normal text, 3:1 large text / UI | WCAG 2.1 AA | | Keyboard navigation | All interactive elements focusable and operable | WCAG 2.1.1 | | Focus indicators | Visible `:focus-visible` ring, 2px+ offset | WCAG 2.4.7 | | Semantic HTML | Use `<button>`, `<nav>`, `<main>`, `<article>` etc. | WCAG 1.3.1 | | Alt text | Descriptive for informational images, `alt=""` for decorative | WCAG 1.1.1 | | Motion safety | Respect `prefers-reduced-motion` | WCAG 2.3.3 | | Touch targets | Minimum 44×44px interactive areas | WCAG 2.5.8 | | ARIA when needed | `aria-label`, `aria-live`, `role` only when native semantics insufficient | WCAG 4.1.2 |

```css /* Robust focus indicator */ :focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }

/* Respect motion preferences */ @media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; } } ```

Component Design

Anatomy of a Well-Designed Component

Every UI component should have clear states, consistent spacing, and predictable behavior:

| State | Visual Treatment | Example | |---|---|---| | Default | Base styling | Button at rest | | Hover | Subtle shift — background, shadow, or scale | `background` lightens 5-10% | | Active / Pressed | Compressed feel — reduced shadow, slight inset | `transform: scale(0.98)` | | Focus | High-visibility ring, no outline removal | `:focus-visible` ring | | Disabled | Reduced opacity, `cursor: not-allowed` | `opacity: 0.5` | | Loading | Spinner or skeleton, disabled interaction | Inline spinner replacing label |

Design Token Architecture

Structure tokens in three layers for maintainability:

```css /* Layer 1: Primitive values */ --blue-500: oklch(0.55 0.2 250); --gray-100: oklch(0.95 0.005 250); --radius-md: 0.5rem;

/* Layer 2: Semantic aliases */ --color-primary: var(--blue-500); --color-surface: var(--gray-100); --radius-button: var(--radius-md);

/* Layer 3: Component-specific */ --btn-bg: var(--color-primary); --btn-radius: var(--radius-button); --btn-padding: var(--space-2) var(--space-4); ```

This three-layer approach allows theme switching by remapping Layer 2 without touching components.

Interaction Patterns

Motion and Animation

Use motion to communicate state changes, not to decorate. Focus on high-impact moments:

| Interaction | Duration | Easing | Purpose | |---|---|---|---| | Button hover | 150ms | `ease-out` | Acknowledge interaction | | Modal open | 250ms | `ease-out` | Draw attention | | Modal close | 200ms | `ease-in` | Quick dismissal | | Page transition | 300ms | `ease-in-out` | Maintain spatial context | | Stagger reveal | 50–80ms delay per item | `ease-out` | Sequential content loading | | Micro-feedback | 100ms | `ease-out` | Toggle, checkbox, switch |

```css /* Staggered entrance animation */ .stagger-item { opacity: 0; translate: 0 1rem; animation: reveal 0.5s ease-out forwards; } .stagger-item:nth-child(1) { animation-delay: 0ms; } .stagger-item:nth-child(2) { animation-delay: 60ms; } .stagger-item:nth-child(3) { animation-delay: 120ms; }

@keyframes reveal { to { opacity: 1; translate: 0 0; } } ```

Scroll-Driven Effects

Use native `animation-timeline: scroll()` (behind `@supports`) for parallax and reveal effects without JavaScript. Wrap in feature detection to gracefully degrade.

Design Quality Checklist

Before shipping, verify against these criteria:

• [ ] Typography: Intentional font pairing, consistent scale, readable line lengths
• [ ] Color: Cohesive palette, WCAG contrast met, semantic feedback colors defined
• [ ] Spacing: Consistent rhythm using spacing tokens, no ad-hoc pixel values
• [ ] Hierarchy: Clear visual flow — eye path follows intended reading order
• [ ] Responsiveness: Tested at mobile, tablet, desktop; no horizontal overflow
• [ ] Accessibility: Keyboard navigable, focus visible, screen-reader tested, motion-safe
• [ ] States: All interactive elements have hover, active, focus, disabled, and loading states
• [ ] Personality: Design has a clear point-of-view — not generic template aesthetic
• [ ] Performance: Images optimized, fonts subset, animations GPU-accelerated (`transform`, `opacity`)
• [ ] Dark mode: If supported, surfaces use layered lightness, not inverted colors