315 lines
11 KiB
Markdown
315 lines
11 KiB
Markdown
---
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name: bento-ui
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description: Web and App implementation guide for Bento UI. Trigger when user wants modular grid cards, Apple-like dashboard style, or sections arranged like a bento box.
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date_added: "2026-06-17"
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risk: safe
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source: self
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source_type: self
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---
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# Bento UI
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> "Everything in its right place. A highly structured, modular grid of distinct compartments."
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## When to Use
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Use this sub-style when the user's request matches the aesthetic described above. This is a child reference of the `design-it` skill and is not meant to be triggered directly.
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## Core Principles
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1. **Strict Grid Structure**: The entire UI is built on a responsive, multi-column grid (usually 3x3, 4x4, or irregular masonry).
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2. **Rounded Compartments**: Every distinct piece of content lives inside a card (compartment) with consistent, usually large, border-radius.
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3. **Equal Spacing**: The gap between compartments must be perfectly consistent everywhere.
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## Visual DNA
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- **Colors**: Highly adaptable, but looks incredibly premium with **Minimalist Slate** or **Yacht Club**. Often uses a slightly off-white or light gray background to make the white compartments pop.
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- **Typography**: Apple-esque (e.g., `SF Pro`, `Inter`). Headlines are usually bold and placed at the top-left or bottom-left of each compartment.
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- **Visuals**: Often relies on high-quality, edge-to-edge images or single, large 3D icons inside specific grid cells to break up text-heavy cards.
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## Web Implementation
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- CSS Grid is mandatory. Flexbox is too difficult to maintain the strict 2D structure.
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- **CSS Example**:
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```css
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.bento-container {
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display: grid;
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grid-template-columns: repeat(4, 1fr);
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grid-auto-rows: 200px;
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gap: 24px;
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padding: 24px;
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background-color: var(--bg-primary); /* Slightly darker than cards */
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}
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.bento-card {
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background-color: #fff;
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border-radius: 32px; /* Very large border radius */
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padding: 32px;
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box-shadow: 0 4px 24px rgba(0,0,0,0.04);
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/* Optional: subtle 1px border for crispness */
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border: 1px solid rgba(0,0,0,0.05);
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display: flex;
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flex-direction: column;
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justify-content: space-between;
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}
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/* Creating spans for different bento sizes */
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.bento-span-2 { grid-column: span 2; }
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.bento-span-2-row { grid-row: span 2; }
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.bento-large { grid-column: span 2; grid-row: span 2; }
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```
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## App Implementation
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### SwiftUI
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```swift
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struct BentoGrid: View {
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let columns = [
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GridItem(.flexible(), spacing: 16),
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GridItem(.flexible(), spacing: 16)
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]
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var body: some View {
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ScrollView {
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LazyVGrid(columns: columns, spacing: 16) {
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// 2x1 Span (Full width)
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BentoCard(title: "Hero", color: .blue)
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.frame(height: 180)
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// 1x1 Spans
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BentoCard(title: "Stats", color: .green)
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.frame(height: 180)
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BentoCard(title: "Graph", color: .purple)
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.frame(height: 180)
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// 1x2 Span (Tall)
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BentoCard(title: "Activity", color: .orange)
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.frame(height: 376) // (180 * 2) + 16 spacing
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// 1x1 Spans next to the tall one
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VStack(spacing: 16) {
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BentoCard(title: "A", color: .pink).frame(height: 180)
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BentoCard(title: "B", color: .cyan).frame(height: 180)
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}
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}
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.padding(16)
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}
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.background(Color(.systemGroupedBackground))
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}
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}
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struct BentoCard: View {
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let title: String
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let color: Color
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var body: some View {
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RoundedRectangle(cornerRadius: 24)
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.fill(Color(.secondarySystemGroupedBackground))
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.overlay(
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Text(title).font(.headline).foregroundColor(color),
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alignment: .topLeading
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)
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.padding(16)
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// Soft bento shadow
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.shadow(color: .black.opacity(0.04), radius: 12, x: 0, y: 4)
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}
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}
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```
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- Use `LazyVGrid` for uniform grids.
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- For complex irregular bento layouts (like 1x2 spans), you often have to mix `VStack` and `HStack` inside the grid cells to fake the spans.
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- Maintain absolute consistency with `cornerRadius` (usually 24-32pt) and `spacing` (usually 16pt).
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### Flutter
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```dart
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import 'package:flutter_staggered_grid_view/flutter_staggered_grid_view.dart';
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class BentoScreen extends StatelessWidget {
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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backgroundColor: Colors.grey[100],
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body: SingleChildScrollView(
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padding: const EdgeInsets.all(16),
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child: StaggeredGrid.count(
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crossAxisCount: 4, // 4 columns total
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mainAxisSpacing: 16,
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crossAxisSpacing: 16,
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children: const [
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// 2x1 (Full width in a 2-col layout, spans 4)
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StaggeredGridTile.count(
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crossAxisCellCount: 4,
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mainAxisCellCount: 2,
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child: BentoCard(title: 'Hero'),
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),
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// 1x1
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StaggeredGridTile.count(
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crossAxisCellCount: 2,
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mainAxisCellCount: 2,
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child: BentoCard(title: 'Stats'),
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),
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// 1x1
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StaggeredGridTile.count(
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crossAxisCellCount: 2,
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mainAxisCellCount: 2,
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child: BentoCard(title: 'Graph'),
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),
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// 1x2 (Tall)
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StaggeredGridTile.count(
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crossAxisCellCount: 2,
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mainAxisCellCount: 4,
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child: BentoCard(title: 'Activity'),
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),
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],
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),
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),
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);
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}
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}
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class BentoCard extends StatelessWidget {
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final String title;
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const BentoCard({required this.title});
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@override
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Widget build(BuildContext context) {
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return Container(
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padding: const EdgeInsets.all(24),
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decoration: BoxDecoration(
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color: Colors.white,
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borderRadius: BorderRadius.circular(24),
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boxShadow: [
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BoxShadow(
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color: Colors.black.withOpacity(0.04),
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blurRadius: 12,
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offset: const Offset(0, 4),
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),
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],
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),
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alignment: Alignment.topLeft,
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child: Text(title, style: const TextStyle(fontWeight: FontWeight.bold)),
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);
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}
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}
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```
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- The `flutter_staggered_grid_view` package is practically mandatory for complex Bento grids in Flutter.
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- Use `StaggeredGridTile.count` to explicitly declare the `crossAxis` and `mainAxis` span of each compartment.
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### React Native
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```jsx
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const BentoScreen = () => {
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return (
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<ScrollView
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style={{ flex: 1, backgroundColor: '#F2F2F7' }}
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contentContainerStyle={{ padding: 16 }}
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>
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{/* 2x1 Span */}
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<View style={[styles.bentoCard, { height: 180, marginBottom: 16 }]}>
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<Text style={styles.title}>Hero</Text>
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</View>
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<View style={{ flexDirection: 'row', gap: 16, marginBottom: 16 }}>
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{/* 1x1 Spans */}
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<View style={[styles.bentoCard, { flex: 1, height: 180 }]}>
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<Text style={styles.title}>Stats</Text>
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</View>
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<View style={[styles.bentoCard, { flex: 1, height: 180 }]}>
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<Text style={styles.title}>Graph</Text>
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</View>
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</View>
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<View style={{ flexDirection: 'row', gap: 16 }}>
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{/* 1x2 Span (Tall) */}
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<View style={[styles.bentoCard, { flex: 1, height: 376 }]}>
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<Text style={styles.title}>Activity</Text>
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</View>
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<View style={{ flex: 1, gap: 16 }}>
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{/* Stacked 1x1s */}
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<View style={[styles.bentoCard, { height: 180 }]}>
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<Text style={styles.title}>A</Text>
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</View>
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<View style={[styles.bentoCard, { height: 180 }]}>
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<Text style={styles.title}>B</Text>
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</View>
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</View>
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</View>
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</ScrollView>
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);
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};
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const styles = StyleSheet.create({
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bentoCard: {
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backgroundColor: '#FFFFFF',
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borderRadius: 24,
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padding: 24,
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shadowColor: '#000',
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shadowOffset: { width: 0, height: 4 },
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shadowOpacity: 0.04,
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shadowRadius: 12,
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elevation: 2,
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},
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title: {
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fontWeight: '700',
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fontSize: 18,
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}
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});
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```
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- React Native lacks CSS Grid. You must manually compose the grid using `flexDirection: 'row'` and vertical stacks.
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- The `gap` property in React Native flexbox makes this significantly easier than using margins.
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### Jetpack Compose
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```kotlin
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@Composable
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fun BentoGrid() {
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Column(
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modifier = Modifier
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.fillMaxSize()
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.background(Color(0xFFF2F2F7))
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.verticalScroll(rememberScrollState())
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.padding(16.dp),
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verticalArrangement = Arrangement.spacedBy(16.dp)
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) {
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// Full width
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BentoCard(title = "Hero", modifier = Modifier.fillMaxWidth().height(180.dp))
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// Two columns
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Row(horizontalArrangement = Arrangement.spacedBy(16.dp)) {
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BentoCard(title = "Stats", modifier = Modifier.weight(1f).height(180.dp))
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BentoCard(title = "Graph", modifier = Modifier.weight(1f).height(180.dp))
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}
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// Complex span: 1x2 left, two 1x1s right
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Row(horizontalArrangement = Arrangement.spacedBy(16.dp)) {
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BentoCard(title = "Activity", modifier = Modifier.weight(1f).height(376.dp))
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Column(
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modifier = Modifier.weight(1f),
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verticalArrangement = Arrangement.spacedBy(16.dp)
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) {
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BentoCard(title = "A", modifier = Modifier.fillMaxWidth().height(180.dp))
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BentoCard(title = "B", modifier = Modifier.fillMaxWidth().height(180.dp))
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}
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}
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}
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}
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@Composable
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fun BentoCard(title: String, modifier: Modifier = Modifier) {
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Card(
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modifier = modifier,
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shape = RoundedCornerShape(24.dp),
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colors = CardDefaults.cardColors(containerColor = Color.White),
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elevation = CardDefaults.cardElevation(defaultElevation = 2.dp)
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) {
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Text(title, fontWeight = FontWeight.Bold, modifier = Modifier.padding(24.dp))
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}
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}
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```
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- While `LazyVerticalGrid` exists, for highly specific irregular bento layouts, manually building rows and columns with `weight(1f)` is often much more reliable.
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- Use `Arrangement.spacedBy(16.dp)` on both Columns and Rows to ensure mathematically perfect gutters.
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## Do's and Don'ts
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- **DO**: Mix sizes! A bento box is boring if every cell is 1x1. Use 2x1, 1x2, and 2x2 cells to create visual interest.
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- **DON'T**: Clutter the inside of a bento card. If it needs a lot of elements, break it into multiple cards.
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## Limitations
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- This is a styling reference and does not replace environment-specific validation, accessibility testing, or expert review.
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- Ensure appropriate contrast ratios and responsive behaviors are verified separately.
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