Agent skill

ux-spacing-layout

Utopia fluid spacing tokens and layout patterns. Use when applying margins, padding, gaps, or creating layouts. Covers space scale, container widths, and responsive spacing. (project)

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npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/ux-spacing-layout

SKILL.md

UX Spacing & Layout Skill

Fluid spacing system using Utopia scale with container query inline (cqi) units. This skill covers spacing tokens, layout patterns, and visual rhythm.

Space Scale

The project uses Utopia fluid spacing with cqi units. Sizes interpolate based on container width.

IMPORTANT: cqi units require container-type: inline-size on an ancestor.

Space Tokens

Token Min (320px) Max (1240px) Usage
--space-3xs 4px 6px Hairline gaps
--space-2xs 8px 11px Tight spacing
--space-xs 12px 17px Compact gaps
--space-s 16px 22px Standard small
--space-m 24px 33px Standard medium
--space-l 32px 44px Generous spacing
--space-xl 48px 67px Section breaks
--space-2xl 64px 89px Major sections
--space-3xl 96px 133px Page-level gaps

One-Up Pairs

For asymmetric spacing relationships:

Token Values Usage
--space-3xs-2xs 4px → 11px Micro to tight
--space-2xs-xs 8px → 17px Tight to compact
--space-xs-s 12px → 22px Compact to standard
--space-s-m 16px → 33px Standard progression
--space-m-l 24px → 44px Medium to generous
--space-l-xl 32px → 67px Section transitions

Usage Patterns

Padding

css
/* Compact element */
.chip {
  padding: var(--space-2xs) var(--space-xs);
}

/* Standard button */
.button {
  padding: var(--space-s) var(--space-m);
}

/* Card */
.card {
  padding: var(--space-m);
}

/* Modal */
.modal {
  padding: var(--space-l);
}

Margins

css
/* Between inline elements */
.inline-group > * + * {
  margin-inline-start: var(--space-xs);
}

/* Between sections */
section + section {
  margin-block-start: var(--space-xl);
}

/* Page container */
.page {
  margin-inline: auto;
  padding-inline: var(--space-m);
}

Gap (Flexbox/Grid)

css
/* Tight list */
.list-tight {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

/* Standard stack */
.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-s);
}

/* Card grid */
.grid {
  display: grid;
  gap: var(--space-m);
}

/* Icon + text */
.icon-text {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

Layout Utilities

u-stack (Vertical)

css
u-stack[gap="3xs"] { gap: var(--space-3xs); }
u-stack[gap="2xs"] { gap: var(--space-2xs); }
u-stack[gap="xs"]  { gap: var(--space-xs); }
u-stack[gap="s"]   { gap: var(--space-s); }
u-stack[gap="m"]   { gap: var(--space-m); }
u-stack[gap="l"]   { gap: var(--space-l); }
u-stack[gap="xl"]  { gap: var(--space-xl); }

u-row (Horizontal)

css
u-row[gap="xs"]  { gap: var(--space-xs); }
u-row[gap="s"]   { gap: var(--space-s); }
u-row[gap="m"]   { gap: var(--space-m); }

Container Widths

css
.u-container {
  width: min(100% - var(--space-m) * 2, var(--max-width, 1200px));
  margin-inline: auto;
}

.narrow { --max-width: 600px; }
.medium { --max-width: 900px; }
.wide   { --max-width: 1200px; }

Visual Rhythm

Consistent Spacing Rules

  1. Related items: Use --space-2xs to --space-xs
  2. Grouped elements: Use --space-s to --space-m
  3. Sections: Use --space-l to --space-xl
  4. Page breaks: Use --space-2xl to --space-3xl

Example Component

css
.card {
  /* Card padding */
  padding: var(--space-m);

  /* Internal spacing */
  display: flex;
  flex-direction: column;
  gap: var(--space-s);
}

.card-header {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.card-content {
  /* Paragraph spacing */
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.card-actions {
  /* Button group */
  display: flex;
  gap: var(--space-xs);
  margin-block-start: var(--space-s);
}

Responsive Spacing

Container Queries

css
/* Compact on small containers */
@container (max-width: 400px) {
  .card {
    padding: var(--space-s);
    gap: var(--space-xs);
  }
}

/* Generous on large containers */
@container (min-width: 800px) {
  .card {
    padding: var(--space-l);
    gap: var(--space-m);
  }
}

Asymmetric Spacing

Use one-up pairs for progressive spacing:

css
.section {
  /* Tight top, generous bottom */
  padding-block: var(--space-s-m) var(--space-m-l);
}

Common Patterns

Form Layout

css
.form {
  display: flex;
  flex-direction: column;
  gap: var(--space-m);
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.form-actions {
  display: flex;
  gap: var(--space-s);
  margin-block-start: var(--space-s);
}

Navigation

css
.nav {
  display: flex;
  gap: var(--space-xs);
  padding: var(--space-2xs);
}

.nav-item {
  padding: var(--space-2xs) var(--space-s);
}

Dialog/Modal

css
.modal {
  padding: var(--space-l);
}

.modal-header {
  padding-block-end: var(--space-m);
  border-block-end: 1px solid var(--theme-outline);
}

.modal-body {
  padding-block: var(--space-m);
}

.modal-footer {
  padding-block-start: var(--space-m);
  display: flex;
  justify-content: flex-end;
  gap: var(--space-s);
}

Avoid

css
/* DON'T: Fixed pixel values */
.bad {
  padding: 16px;
  margin: 24px;
}

/* DON'T: Magic numbers */
.bad {
  gap: 13px;
}

/* DON'T: Inconsistent spacing */
.bad {
  padding: 10px 20px 15px 25px;
}

Do

css
/* DO: Use space tokens */
.good {
  padding: var(--space-s);
  margin: var(--space-m);
}

/* DO: Consistent relationships */
.good {
  padding: var(--space-s) var(--space-m);
}

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