Layouts

Relevant source files

This document covers the Layer 3 layout components in the @ui8kit/core architecture: DashLayout, LayoutBlock, and SplitBlock. These are template-level components (organisms) that orchestrate Layer 2 UI components and Layer 1 primitives into structural page layouts. This page focuses on layout composition patterns, content hook systems, and special considerations for building application structures. For basic layout primitives (Grid, Flex, Stack), see Core Components.
For UI components used within layouts, see UI Components.
For API details and prop references, see Layout Components API.

Layout Architecture Overview

The layout system operates at the highest architectural layer, composing UI components and primitives into complete page structures. The three layout components serve distinct structural purposes:

External Dependencies

Layer 1: Primitives Used

Layer 2: UI Components Used

Layer 3: Layout Components

uses

uses

uses

uses

uses

uses

requires

uses

uses

uses

uses

uses

uses

uses

uses

uses

uses

uses

uses

uses

optional icons

optional icons

DashLayout
(Dashboard Structure)

LayoutBlock
(Content Sections)

SplitBlock
(Two-Column Layouts)

Card

Button

Text

Title

Badge

Icon

Image

Container

Group

Block
(Semantic sections)

Box
(Generic container)

Grid
(CSS Grid)

Stack
(Vertical/horizontal)

react-resizable-panels
(PanelGroup, Panel)

lucide-react
(Icon components)

Sources: src/layouts/DashLayout.tsx1-99 src/layouts/LayoutBlock.tsx1-389 src/layouts/SplitBlock.tsx1-145 README.md147-168

DashLayout - Dashboard Template

DashLayout provides a complete dashboard structure with resizable panels, navigation header, and collapsible sidebar. It uses react-resizable-panels for interactive panel management.

Component Structure

renders

renders

contains

contains

contains

wraps

wraps

uses

uses

uses

uses

uses

uses

uses

uses

Dashboard
(Main Component)

Navbar
(Header with brand + theme toggle)

Sidebar
(Collapsible navigation)

Main Panel
(Content area)

PanelGroup
(direction: horizontal)

Panel
(Sidebar container)

PanelResizeHandle
(Drag handle)

Panel
(Content container)

Block component='nav'

Group

Button variant='ghost'

Icon

Text

Block component='aside'

Stack

Container

Key Interfaces and Props

Interface	Purpose	Key Props
`DashboardProps`	Main layout configuration	`page`, `children`, `sidebar`, `navbarProps`
`NavbarProps`	Header configuration	`isDarkMode`, `toggleDarkMode`, `brand`
`SidebarProps`	Sidebar configuration	`children`, `title`, `dataClass`

Implementation Details

The Dashboard component at src/layouts/DashLayout.tsx64-91 orchestrates the layout:

Navbar renders at top with theme toggle at src/layouts/DashLayout.tsx34-49
PanelGroup with direction="horizontal" creates resizable layout at src/layouts/DashLayout.tsx75-88
Panel components define sidebar (20% default, 10-40% range) and content area (80% default, 50% minimum) at src/layouts/DashLayout.tsx76-86
PanelResizeHandle enables interactive resizing at src/layouts/DashLayout.tsx80
Container wraps main content with responsive sizing at src/layouts/DashLayout.tsx84

Usage Pattern

import { DashLayout } from '@ui8kit/core';

<DashLayout
  sidebar={<NavSidebar />}
  navbarProps={{
    brand: "MyApp",
    isDarkMode: true,
    toggleDarkMode: handleToggle
  }}
>
  <Container>
    <Card p="lg">Content</Card>
  </Container>
</DashLayout>

The layout automatically persists panel sizes via autoSaveId="dashlayout-panels" at src/layouts/DashLayout.tsx75 Sources: src/layouts/DashLayout.tsx1-99 README.md155-168

LayoutBlock - Flexible Content Sections

LayoutBlock is a versatile layout component that renders content sections with three layout modes (grid, flex, stack) and a powerful content hook system for dynamic rendering.

Layout Modes and Configuration

renders

renders

renders

uses

uses

uses

wraps with

wraps in

LayoutBlock

Grid Mode
(layout='grid')

Flex Mode
(layout='flex')

Stack Mode
(layout='stack')

Grid Component
cols, gap, align, justify

Group Component
gap, align, justify, wrap

Stack Component
gap, align

Container
(optional wrapper)

Block component='section'

Content Hook System

The content hook system at src/layouts/LayoutBlock.tsx22-30 allows replacing any part of the rendered content:

Hook	Purpose	Signature
`beforeHeader`	Content before header section	`(content: any) => ReactNode`
`header`	Custom header renderer	`(content: any) => ReactNode`
`afterHeader`	Content after header section	`(content: any) => ReactNode`
`beforeItems`	Content before items list	`(content: any) => ReactNode`
`item`	Custom item renderer	`(item: any, index: number) => ReactNode`
`afterItems`	Content after items list	`(content: any) => ReactNode`

Default Renderers

The component provides default renderers at src/layouts/LayoutBlock.tsx123-227:

DefaultHeaderRenderer at src/layouts/LayoutBlock.tsx87-121 - Renders badge, title, and description with alignment
DefaultItemRenderers.gridCard at src/layouts/LayoutBlock.tsx126-166 - Card-based grid items with images/icons
DefaultItemRenderers.gridSimple at src/layouts/LayoutBlock.tsx169-196 - Minimal grid items without cards
DefaultItemRenderers.flexItem at src/layouts/LayoutBlock.tsx199-226 - Horizontal group layout for flex/stack modes

Configuration Props

Prop Category	Props	Purpose
Layout Control	`layout`, `useContainer`, `containerSize`	Mode and container settings
Grid Settings	`cols`, `gridCols`, `gap`, `align`, `justify`	CSS Grid configuration
Flex Settings	`wrap`, `flexWrap`	Flexbox wrapping behavior
Stack Settings	`stackAlign`	Vertical alignment
Header Settings	`showHeader`, `headerAlign`	Header display and alignment
Content Data	`content`, `content.items`	Data structure for rendering
Customization	`contentHooks`	Custom render functions

Content Data Structure

The content prop at src/layouts/LayoutBlock.tsx61-77 follows this schema:

content: {
  badge?: string;          // Optional badge text
  title?: string;          // Section title
  description?: string;    // Section description
  items?: Array<{
    id: string;           // Required unique identifier
    title?: string;       // Item title
    description: string;  // Item description (required)
    image?: {             // Optional image
      src: string;
      alt: string;
    };
    lucideIcon?: any;     // Optional Lucide icon component
    [key: string]: any;   // Additional custom data
  }>;
}

Layout Mode Rendering

The rendering logic at src/layouts/LayoutBlock.tsx298-353 selects the appropriate layout component:

grid

flex

stack

renderItems()

layout type?

Grid Component
cols, gap, align, justify
data-class='layout-grid'

Group Component
gap, align, justify, wrap
data-class='layout-flex'

Stack Component
gap, align
data-class='layout-stack'

itemRenderer(item, index)

Each layout wraps items in the appropriate primitive component with data-class attributes for DOM targeting at src/layouts/LayoutBlock.tsx320-348

Usage Examples

Grid with Cards:

<LayoutBlock
  layout="grid"
  cols="1-2-3"
  gap="lg"
  content={{
    badge: "Features",
    title: "Why Choose Us",
    description: "Discover our advantages",
    items: [
      {
        id: "1",
        title: "Fast",
        description: "Lightning speed",
        lucideIcon: Zap
      }
    ]
  }}
/>

Flex with Custom Hooks:

<LayoutBlock
  layout="flex"
  wrap="wrap"
  contentHooks={{
    header: (content) => <CustomHeader {...content} />,
    item: (item, index) => <CustomCard key={item.id} {...item} />
  }}
  content={data}
/>

Sources: src/layouts/LayoutBlock.tsx1-389 README.md149-154

SplitBlock - Two-Column Split Layout

SplitBlock creates two-column layouts with flexible media and content sections, commonly used for hero sections, feature showcases, and content/image combinations.

Layout Modes

SplitBlock

Container Mode
(splitSection=false)

Full Width Mode
(splitSection=true)

Block component='section'

Container wrapper

Grid cols='1-2'

Grid cols='1-2'
data-class='split-grid'

leftMedia=true

leftMedia=false

Content Hook System

Similar to LayoutBlock, SplitBlock supports content hooks at src/layouts/SplitBlock.tsx11-15:

Hook	Purpose	Signature
`beforeContent`	Content before main section	`(content: any) => ReactNode`
`content`	Main content renderer	`(content: any) => ReactNode`
`afterContent`	Content after main section	`(content: any) => ReactNode`

Slots API

The slots API at src/layouts/SplitBlock.tsx36-42 provides named overrides:

slots?: {
  media?: ReactNode;      // Override media section
  header?: ReactNode;     // Future: Header slot
  body?: ReactNode;       // Future: Body slot
  actions?: ReactNode;    // Future: Actions slot
}

The media slot resolution at src/layouts/SplitBlock.tsx91 prioritizes slot overrides over direct props.

Configuration Props

Prop	Type	Default	Purpose
`mediaSection`	`ReactNode`	-	Content for media column
`contentSection`	`ReactNode`	-	Content for content column
`leftMedia`	`boolean`	`false`	Position media on left side
`splitSection`	`boolean`	`true`	Use full-width grid vs container
`containerSize`	`ContainerSizingProps["size"]`	`"lg"`	Container size (when `splitSection=false`)
`gap`	`VariantGridProps["gap"]`	`"lg"`	Gap between columns
`align`	`VariantGridProps["align"]`	`"center"`	Vertical alignment

Layout Rendering Logic

The rendering logic at src/layouts/SplitBlock.tsx94-136 creates two distinct layouts: Container Mode (splitSection=false) at src/layouts/SplitBlock.tsx96-111:

Wraps grid in responsive Container
Applies containerSize and padding props
Suitable for standard page sections

Full Width Mode (splitSection=true) at src/layouts/SplitBlock.tsx115-135:

Grid directly after Block with no container
Uses data-class="split-grid" for identification at src/layouts/SplitBlock.tsx129
Applies flex-1 items-center for full viewport height

Column Order

The column order is determined by leftMedia prop at src/layouts/SplitBlock.tsx106-107 and src/layouts/SplitBlock.tsx131-132:

leftMedia=true: [mediaSection, contentSection]
leftMedia=false: [contentSection, mediaSection]

Usage Examples

Basic Split with Media:

<SplitBlock
  mediaSection={
    <Image src="/hero.jpg" alt="Hero" fit="cover" />
  }
  contentSection={
    <Stack gap="lg">
      <Title order={1}>Welcome</Title>
      <Text>Description text</Text>
      <Button>Get Started</Button>
    </Stack>
  }
  leftMedia
/>

With Content Hooks:

<SplitBlock
  content={{ title: "Feature", description: "Details" }}
  contentHooks={{
    beforeContent: (content) => <Badge>{content.badge}</Badge>,
    content: (content) => (
      <Stack gap="md">
        <Title>{content.title}</Title>
        <Text>{content.description}</Text>
      </Stack>
    ),
    afterContent: () => <Button>Learn More</Button>
  }}
  slots={{
    media: <Image src="/feature.jpg" />
  }}
/>

Full Width Hero:

<SplitBlock
  splitSection
  leftMedia={false}
  mediaSection={<HeroImage />}
  contentSection={<HeroContent />}
/>

Sources: src/layouts/SplitBlock.tsx1-145 README.md149-154

Layout Primitives Integration

Layout components extensively use Layer 1 primitives for structure. Understanding these primitives is essential for working with layouts.

Grid Component

Used by LayoutBlock (grid mode) and SplitBlock for CSS Grid layouts:

applies

applies

applies

applies

'1-2-3' creates

Grid
(CSS Grid)

cols variant
'1-2-3', '2', '3', '4'

gap variant
'sm', 'md', 'lg', 'xl'

align variant
'start', 'center', 'end'

justify variant
'start', 'center', 'between'

Responsive columns
1 col mobile
2 cols tablet
3 cols desktop

Common Grid Configurations:

cols="1-2-3" - Responsive 1/2/3 columns
cols="2" - Fixed 2 columns
gap="lg" - Large gap between items
align="center" - Center items vertically

Stack Component

Used by LayoutBlock (stack mode) and within content sections for vertical layouts:

Prop	Values	Purpose
`gap`	`"sm"`, `"md"`, `"lg"`, `"xl"`, `"2xl"`, `"3xl"`	Vertical spacing
`align`	`"start"`, `"center"`, `"end"`	Horizontal alignment
`ta`	`"left"`, `"center"`, `"right"`	Text alignment

Block Component

All layout components use Block as the root semantic container:

<Block
  component="section"  // Semantic HTML5 tag
  w="full"            // Full width
  py="xl"             // Vertical padding
  data-class="layout-block"  // DOM identification
>
  {/* Layout content */}
</Block>

The component prop at src/layouts/DashLayout.tsx16 src/layouts/DashLayout.tsx36 and src/layouts/DashLayout.tsx74 ensures semantic HTML structure (<section>, <nav>, <aside>, <main>). Sources: src/layouts/LayoutBlock.tsx3-16 src/layouts/SplitBlock.tsx3-8 src/layouts/DashLayout.tsx2

Composition Patterns

Layout components follow specific composition patterns for building complex structures.

Pattern 1: Nested Layout Composition

Layouts can be nested to create complex page structures:

Example:

<DashLayout sidebar={<Navigation />}>
  <LayoutBlock layout="grid" cols="1-2-3" content={heroData} />
  <SplitBlock mediaSection={<Image />} contentSection={<Content />} />
  <LayoutBlock layout="stack" content={testimonialsData} />
</DashLayout>

Pattern 2: Container Management

Layouts use Container component for responsive width control:

Layout	Container Usage	When Used
`DashLayout`	Always uses `Container` at src/layouts/DashLayout.tsx84	Wraps main content panel
`LayoutBlock`	Optional via `useContainer` prop at src/layouts/LayoutBlock.tsx259	Default `true`, can disable for full-width
`SplitBlock`	Conditional via `splitSection` prop at src/layouts/SplitBlock.tsx94-112	Used when `splitSection=false`

Pattern 3: Content Hook Override

The content hook system enables progressive enhancement:

Fallback Chain:

Check for custom contentHooks.item at src/layouts/LayoutBlock.tsx302
Fall back to default renderer at src/layouts/LayoutBlock.tsx285
Apply layout-specific defaults at src/layouts/LayoutBlock.tsx230-254

Pattern 4: Slot-Based Overrides

SplitBlock slots provide targeted customization without full content hooks:

<SplitBlock
  // Base props
  leftMedia
  gap="xl"
  
  // Original sections
  mediaSection={<DefaultImage />}
  contentSection={<DefaultContent />}
  
  // Slot overrides
  slots={{
    media: <CustomVideo />  // Overrides mediaSection
  }}
/>

The resolution at src/layouts/SplitBlock.tsx91 prioritizes slots over direct props.

Pattern 5: Data-Driven Rendering

Layouts accept structured data and render automatically:

const pageData = {
  badge: "New",
  title: "Feature Section",
  description: "Amazing features",
  items: [
    { id: "1", title: "Fast", description: "Speed", lucideIcon: Zap },
    { id: "2", title: "Secure", description: "Safe", lucideIcon: Lock }
  ]
};

<LayoutBlock layout="grid" cols="2" content={pageData} />

The rendering pipeline at src/layouts/LayoutBlock.tsx288-361 handles:

Header rendering from content.badge/title/description
Item iteration and rendering from content.items
Layout wrapping based on layout mode

Sources: src/layouts/LayoutBlock.tsx256-386 src/layouts/SplitBlock.tsx67-143 src/layouts/DashLayout.tsx64-91

Special Considerations

Semantic HTML Structure

Layout components enforce semantic HTML5 structure:

Component	Root Element	Purpose
`DashLayout`	`<nav>` + `<main>`	Navigation header + main content at src/layouts/DashLayout.tsx36-74
`DashLayout.Sidebar`	`<aside>`	Sidebar navigation at src/layouts/DashLayout.tsx16
`LayoutBlock`	`<section>`	Content sections at src/layouts/LayoutBlock.tsx366
`SplitBlock`	`<section>`	Split content sections at src/layouts/SplitBlock.tsx97-117

This ensures accessibility and SEO compliance without additional configuration.

Data-Class Attributes

All layouts apply data-class attributes for consistent DOM targeting:

Component	Data-Class Value	Location
`DashLayout.Navbar`	`data-role="dash-navbar"`	src/layouts/DashLayout.tsx36
`DashLayout.Sidebar`	Custom via prop	src/layouts/DashLayout.tsx16
`LayoutBlock`	`data-class="layout-block"`	src/layouts/LayoutBlock.tsx371
`LayoutBlock` Grid	`data-class="layout-grid"`	src/layouts/LayoutBlock.tsx320
`LayoutBlock` Flex	`data-class="layout-flex"`	src/layouts/LayoutBlock.tsx333
`LayoutBlock` Stack	`data-class="layout-stack"`	src/layouts/LayoutBlock.tsx344
`SplitBlock` Grid	`data-class="split-grid"`	src/layouts/SplitBlock.tsx129

These enable reliable testing and styling without className dependencies.

Responsive Behavior

Layouts handle responsive design through variant props: Grid Responsive Columns:

cols="1-2-3" creates mobile→tablet→desktop breakpoints
Automatically collapses to 1 column on mobile
Scales to 2 columns on tablet (md:)
Expands to 3 columns on desktop (lg:)

Container Responsive Sizing:

containerSize="lg" applies max-w-7xl with breakpoint adjustments
Automatically adds horizontal padding on mobile
Centers content with mx="auto"

Panel Resizing (DashLayout):

Sidebar: defaultSize={20}, minSize={10}, maxSize={40} at src/layouts/DashLayout.tsx76
Content: defaultSize={80}, minSize={50} at src/layouts/DashLayout.tsx82
Sizes persisted via autoSaveId at src/layouts/DashLayout.tsx75

Performance Considerations

Item Key Management: The LayoutBlock component requires unique id in content items at src/layouts/LayoutBlock.tsx66 for efficient React reconciliation. Keys are applied at src/layouts/LayoutBlock.tsx306 Memoization Opportunities: Content hooks and renderers are evaluated on every render. For expensive computations, wrap in useMemo:

const contentHooks = useMemo(() => ({
  item: (item, index) => <ExpensiveComponent {...item} />
}), [dependencies]);

Panel State Persistence: DashLayout automatically persists panel sizes to localStorage via react-resizable-panels, reducing layout shift on reload.

External Dependencies

Component	Dependency	Purpose	Installation
`DashLayout`	`react-resizable-panels`	Resizable panel system	`npm install react-resizable-panels`
All layouts	`lucide-react`	Optional icon components	`npm install lucide-react`

These are listed as peer dependencies and must be installed separately when using layouts. Sources: src/layouts/DashLayout.tsx4 src/layouts/LayoutBlock.tsx366-383 src/layouts/SplitBlock.tsx94-136

Usage Examples

Dashboard Application

Complete dashboard with navigation, resizable panels, and content sections:

import { DashLayout, LayoutBlock, Card } from '@ui8kit/core';
import { Home, Settings, Users } from 'lucide-react';

function DashboardApp() {
  const [darkMode, setDarkMode] = useState(false);
  
  return (
    <DashLayout
      navbarProps={{
        brand: "Admin Panel",
        isDarkMode: darkMode,
        toggleDarkMode: () => setDarkMode(!darkMode)
      }}
      sidebar={
        <Stack gap="md">
          <Button variant="ghost" leftSection={<Home />}>
            Dashboard
          </Button>
          <Button variant="ghost" leftSection={<Users />}>
            Users
          </Button>
          <Button variant="ghost" leftSection={<Settings />}>
            Settings
          </Button>
        </Stack>
      }
    >
      <LayoutBlock
        layout="grid"
        cols="1-2-3"
        gap="lg"
        content={{
          title: "Overview",
          description: "Key metrics",
          items: statsData
        }}
      />
    </DashLayout>
  );
}

Marketing Landing Page

Hero section with split layout and feature grid:

import { SplitBlock, LayoutBlock } from '@ui8kit/core';
import { Zap, Shield, Globe } from 'lucide-react';

function LandingPage() {
  return (
    <>
      <SplitBlock
        leftMedia={false}
        splitSection
        mediaSection={
          <Image
            src="/hero.jpg"
            alt="Hero"
            fit="cover"
            h="full"
          />
        }
        contentSection={
          <Stack gap="xl" align="start" p="2xl">
            <Badge variant="secondary">New Release</Badge>
            <Title order={1} size="4xl" fw="bold">
              Build Faster
            </Title>
            <Text size="xl" c="secondary-foreground">
              Create amazing interfaces with minimal code
            </Text>
            <Group gap="md">
              <Button variant="primary" size="lg">
                Get Started
              </Button>
              <Button variant="outline" size="lg">
                Learn More
              </Button>
            </Group>
          </Stack>
        }
      />
      
      <LayoutBlock
        layout="grid"
        cols="1-2-3"
        gap="xl"
        py="3xl"
        content={{
          badge: "Features",
          title: "Why Choose Us",
          description: "Everything you need to succeed",
          items: [
            {
              id: "fast",
              title: "Lightning Fast",
              description: "Optimized for performance",
              lucideIcon: Zap
            },
            {
              id: "secure",
              title: "Secure by Default",
              description: "Built with security in mind",
              lucideIcon: Shield
            },
            {
              id: "global",
              title: "Global Scale",
              description: "Deploy worldwide instantly",
              lucideIcon: Globe
            }
          ]
        }}
      />
    </>
  );
}

Content-Heavy Article Layout

Stack layout with custom content hooks for rich content:

import { LayoutBlock, createLayoutContentHook } from '@ui8kit/core';

const articleHooks = createLayoutContentHook({
  header: (content) => (
    <Stack gap="md" align="center" ta="center">
      <Badge>{content.category}</Badge>
      <Title order={1} size="4xl">{content.title}</Title>
      <Text c="muted" size="sm">
        {content.author} • {content.date}
      </Text>
    </Stack>
  ),
  item: (item, index) => (
    <Card p="xl" rounded="lg" shadow="sm">
      <Stack gap="lg">
        <Title order={2} size="2xl">{item.title}</Title>
        <Text>{item.content}</Text>
        {item.quote && (
          <Box p="lg" bg="muted" rounded="md" border="1px solid border">
            <Text size="lg" fw="medium">"{item.quote}"</Text>
          </Box>
        )}
      </Stack>
    </Card>
  )
});

function ArticlePage() {
  return (
    <LayoutBlock
      layout="stack"
      gap="2xl"
      containerSize="md"
      contentHooks={articleHooks}
      content={articleData}
    />
  );
}

Sources: README.md36-168 src/layouts/DashLayout.tsx53-96 src/layouts/LayoutBlock.tsx256-389 src/layouts/SplitBlock.tsx67-143

Getting started

Architecture

Components

Development Guide

​Layouts

​Layout Architecture Overview

​DashLayout - Dashboard Template

​Component Structure

​Key Interfaces and Props

​Implementation Details

​Usage Pattern

​LayoutBlock - Flexible Content Sections

​Layout Modes and Configuration

​Content Hook System

​Default Renderers

​Configuration Props

​Content Data Structure

​Layout Mode Rendering

​Usage Examples

​SplitBlock - Two-Column Split Layout

​Layout Modes

​Content Hook System

​Slots API

​Configuration Props

​Layout Rendering Logic

​Column Order

​Usage Examples

​Layout Primitives Integration

​Grid Component

​Stack Component

​Block Component

​Composition Patterns

​Pattern 1: Nested Layout Composition

​Pattern 2: Container Management

​Pattern 3: Content Hook Override

​Pattern 4: Slot-Based Overrides

​Pattern 5: Data-Driven Rendering

​Special Considerations

​Semantic HTML Structure

​Data-Class Attributes

​Responsive Behavior

​Performance Considerations

​External Dependencies

​Usage Examples

​Dashboard Application

​Marketing Landing Page

​Content-Heavy Article Layout

Layouts

Layout Architecture Overview

DashLayout - Dashboard Template

Component Structure

Key Interfaces and Props

Implementation Details

Usage Pattern

LayoutBlock - Flexible Content Sections

Layout Modes and Configuration

Content Hook System

Default Renderers

Configuration Props

Content Data Structure

Layout Mode Rendering

Usage Examples

SplitBlock - Two-Column Split Layout

Layout Modes

Content Hook System

Slots API

Configuration Props

Layout Rendering Logic

Column Order

Usage Examples

Layout Primitives Integration

Grid Component

Stack Component

Block Component

Composition Patterns

Pattern 1: Nested Layout Composition

Pattern 2: Container Management

Pattern 3: Content Hook Override

Pattern 4: Slot-Based Overrides

Pattern 5: Data-Driven Rendering

Special Considerations

Semantic HTML Structure

Data-Class Attributes

Responsive Behavior

Performance Considerations

External Dependencies

Usage Examples

Dashboard Application

Marketing Landing Page

Content-Heavy Article Layout