# Split Mosaic

> A split mosaic layout — a tall main hero-detail panel, a top context strip, and a three-tile mosaic (analytics with a bottom-anchored chart, an activity feed with progress, and a captioned gallery). Skeleton-only, mobile-first, and design-system agnostic.

- Category: Layout
- Frameworks: Vanilla, React + CSS, React + Tailwind
- Design system: Aperture
- Dark mode: no
- Access: premium (Atheros AI Pass)
- Tags: grid-areas, skeleton
- Page: https://builder.atheros.ai/components/split-mosaic
- Preview: https://d17nmjscumqk5d.cloudfront.net/builder/templates/tpl_builder_split_mosaic/preview-8b7f412acdce.webp

## Features

- `grid-template-areas` split mosaic — a tall main panel, a top context strip, and a three-tile mosaic that re-composes across breakpoints
- Five distinct regions, each a card role (main hero-detail, top strip, analytics, activity feed, captioned gallery)
- Skeleton wireframe placeholders with color-mixed accents derived from design tokens
- Rows grow to content with `minmax(<min>, auto)` so nothing clips and the page scrolls
- Mosaic recomposes at 560px (stacked → two-column) and 900px (main splits to a full-height left column)
- All colors, spacing, and radii driven by design-system tokens
- Prefers-reduced-motion support for accessibility
- Per-region accent colors computed via oklch color-mix from semantic palette tokens

## Accessibility

- **ARIA label** — `.bento` grid has `aria-label="Split mosaic layout"`
- **Busy state** — `.bento` starts `aria-busy="true"` and is cleared to `false` by `markReady()` once rendered
- **Reduced motion** — `prefers-reduced-motion: reduce` kills all animations and transitions
- **Focus-visible** — Interactive focus styling relies on `:focus-visible` from the design tokens
- **Dynamic viewport** — Uses `100dvh` for proper mobile viewport height

## Common questions

**Which frameworks is Split Mosaic available in?**

Split Mosaic ships as Vanilla, React + CSS and React + Tailwind — HTML, CSS, JS and React source you can copy, download or clone into Atheros AI Builder.

**Is the Split Mosaic layout component free?**

Split Mosaic is a premium component. Anyone can preview it; the source, downloads and AI customisation are included with Atheros AI Pass.

**Does Split Mosaic support dark mode?**

Split Mosaic ships a single light theme, drawn from the Aperture design system's tokens.

## Get the code

Preview Split Mosaic live, then sign in to copy or download the source, apply another design system, or ask the AI assistant to change it: https://builder.atheros.ai/components/split-mosaic

Every component on https://builder.atheros.ai is also reachable from Claude Code, Cursor and Codex through the Atheros MCP server (paid plans). Component index: https://builder.atheros.ai/llms-components.txt