shadcn/Tailwind 布局指南：解决CSS高度、Flex/Grid滚动问题，实现首次渲染正确

shadcn-layouts by jwynia/agent-skills

172 周安装量

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安装命令

npx skills add https://github.com/jwynia/agent-skills --skill shadcn-layouts

UI组件库 CSS 前端架构

🇨🇳中文介绍

shadcn/Tailwind 布局

帮助生成首次渲染即正确的 shadcn/Tailwind 组件。大多数由智能体生成的 UI 失败的原因并非语法错误，而是由于缺乏对 CSS 布局工作原理的心智模型——即假设上的差距。

何时使用此技能

在以下情况使用此技能：

创建 shadcn/Tailwind 布局时
调试高度/滚动问题时
修复 flex/grid 问题时
设置全页面应用外壳时

在以下情况不要使用此技能：

编写后端代码时
处理非 Tailwind CSS 项目时
进行设计时（请先使用 frontend-design 技能）

核心原则

CSS 布局源于约束。高度从显式祖先元素向下传递。宽度从内容向上传递。智能体失败是因为它们在应用类时没有理解约束链。

关键心智模型

模型 1：高度继承链

h-full 意味着 height: 100%。100% 的什么？100% 的父元素的计算高度。

错误（链不完整）：
<html>                        <!-- 无高度 -->
  <body>                      <!-- 无高度 -->
    <div class="h-full">      <!-- 100% 的 0 = 0 -->

正确（链完整）：
<html class="h-full">         <!-- 视口的 100% -->
  <body class="h-full">       <!-- html 的 100% -->
    <div class="h-full">      <!-- body 的 100% = 生效 -->

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模型 2：Flex 溢出陷阱

Flex 子元素具有隐式的 min-height: auto，这阻止了其缩小到内容尺寸以下。

// 错误（不会滚动）
<div className="flex flex-col h-screen">
  <main className="flex-1 overflow-y-auto">  {/* 无法缩小！ */}

// 正确（正确滚动）
<div className="flex flex-col h-screen">
  <main className="flex-1 overflow-y-auto min-h-0">  {/* 可以缩小 */}

规则： 需要滚动的 Flex 子元素需要 min-h-0。不应缩小的子元素需要 shrink-0。

模型 3：Grid 父/子分离

Grid 定义在父元素上。子元素只是占据单元格。

// 错误
<div className="grid-cols-3">           {/* 缺少 'grid'！ */}

// 正确
<div className="grid grid-cols-3">      {/* 'grid' 启用 grid-cols-* */}

规则： 必须在父元素上声明 flex 或 grid，方向/模板类才能生效。

模型 4：滚动容器尺寸

滚动容器需要显式尺寸才能知道何时滚动。

// 错误（从不滚动）
<ScrollArea>  {/* 无高度约束 */}

// 正确（受 flex 约束）
<div className="flex flex-col h-screen">
  <ScrollArea className="flex-1 min-h-0">

SL1：高度链断裂

症状： 元素折叠，h-full 不生效 修复： 向上追溯到 html，添加高度或使用 h-screen

SL2：Flex 溢出被阻止

症状： 滚动不生效，内容溢出 修复： 为需要滚动的 flex 子元素添加 min-h-0

SL3：Grid 结构错误

症状： 项目垂直堆叠而不是分列 修复： 确保父元素上有 grid grid-cols-*

SL4：样式未应用

症状： 组件未样式化，颜色错误 修复： 检查 Tailwind 内容路径，globals.css 中的 CSS 变量

SL5：组件依赖缺失

症状： "Module not found"，功能损坏 修复： npx shadcn add [component]，安装 peer 依赖

全页面应用外壳

// layout.tsx
<html lang="en" className="h-full">
  <body className="h-full">{children}</body>
</html>

// page.tsx
<div className="flex h-full">
  <aside className="w-64 shrink-0 border-r overflow-y-auto">
    <nav>...</nav>
  </aside>
  <main className="flex-1 min-w-0 overflow-y-auto">
    {children}
  </main>
</div>

带标题的仪表板

<div className="flex flex-col h-screen">
  <header className="h-16 shrink-0 border-b">...</header>
  <div className="flex flex-1 min-h-0">
    <aside className="w-64 shrink-0 border-r overflow-y-auto">...</aside>
    <main className="flex-1 min-w-0 overflow-y-auto p-6">
      {children}
    </main>
  </div>
</div>

<div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
  {items.map(item => (
    <Card key={item.id}>
      <CardHeader><CardTitle>{item.title}</CardTitle></CardHeader>
      <CardContent>{item.content}</CardContent>
    </Card>
  ))}
</div>

使用 h-full 而不验证祖先链。修复： 向上追溯到 html。使用 h-screen 来打破链条。

在 flex 子元素上添加 overflow-y-auto 而没有 min-h-0。修复： Flex 子元素需要 min-h-0 才能缩小。

猜测导入路径，如 shadcn/ui。修复： 检查 components.json 中的别名。通常是 @/components/ui/*。

扁平化复合组件

扁平化复合组件（例如 Dialog 没有 DialogTrigger/DialogContent）。修复： 保持所需的嵌套结构。

生成前检查清单

已知导入别名（@/components/ui/*）
html 有 h-full
body 有 h-full 或 min-h-full
滚动容器有显式高度
需要滚动的 Flex 子元素有 min-h-0
固定元素有 shrink-0

frontend-design - 实现前的设计决策
react-pwa - React 应用的 PWA 功能

🇺🇸English

shadcn/Tailwind Layouts

Help generate shadcn/Tailwind components that render correctly the first time. Most agent-generated UI fails due to missing mental models about how CSS layout works—not syntax errors, but assumption gaps.

When to Use This Skill

Use this skill when:

Creating shadcn/Tailwind layouts
Debugging height/scroll issues
Fixing flex/grid problems
Setting up full-page app shells

Do NOT use this skill when:

Writing backend code
Working on non-Tailwind CSS projects
Designing (use frontend-design first)

Core Principle

CSS layout flows from constraints. Height flows down from explicit ancestors. Width flows up from content. Agents fail because they apply classes without understanding the constraint chain.

Critical Mental Models

Model 1: Height Inheritance Chain

h-full means height: 100%. 100% of what? 100% of the parent's computed height.

BROKEN (chain incomplete):
<html>                        <!-- no height -->
  <body>                      <!-- no height -->
    <div class="h-full">      <!-- 100% of nothing = 0 -->

WORKING (chain complete):
<html class="h-full">         <!-- 100% of viewport -->
  <body class="h-full">       <!-- 100% of html -->
    <div class="h-full">      <!-- 100% of body = works -->

Rule: Trace from element up to <html>. Every ancestor needs explicit height, OR use viewport units (h-screen) to break the chain.

Model 2: Flex Overflow Gotcha

Flex children have implicit min-height: auto, preventing shrinking below content size.

// BROKEN (won't scroll)
<div className="flex flex-col h-screen">
  <main className="flex-1 overflow-y-auto">  {/* Can't shrink! */}

// WORKING (scrolls correctly)
<div className="flex flex-col h-screen">
  <main className="flex-1 overflow-y-auto min-h-0">  {/* Can shrink */}

Rule: Flex children that scroll need min-h-0. Children that shouldn't shrink need shrink-0.

Model 3: Grid Parent/Child Separation

Grid is defined on the parent. Children just occupy cells.

// BROKEN
<div className="grid-cols-3">           {/* Missing 'grid'! */}

// WORKING
<div className="grid grid-cols-3">      {/* 'grid' enables grid-cols-* */}

Rule: flex or grid must be declared on parent before direction/template classes work.

Model 4: Scroll Container Dimensions

Scroll containers need explicit dimensions to know when to scroll.

// BROKEN (never scrolls)
<ScrollArea>  {/* No height constraint */}

// WORKING (flex-constrained)
<div className="flex flex-col h-screen">
  <ScrollArea className="flex-1 min-h-0">

Diagnostic States

SL1: Height Chain Broken

Symptoms: Elements collapse, h-full not working Fix: Trace to html, add heights or use h-screen

SL2: Flex Overflow Blocked

Symptoms: Scroll doesn't work, content overflows Fix: Add min-h-0 to flex children that scroll

SL3: Grid Structure Wrong

Symptoms: Items stack vertically instead of columns Fix: Ensure grid grid-cols-* on parent

SL4: Styles Not Applying

Symptoms: Unstyled components, colors wrong Fix: Check Tailwind content paths, CSS variables in globals.css

SL5: Component Dependencies Missing

Symptoms: "Module not found", functionality broken Fix: npx shadcn add [component], install peer deps

Common Layout Patterns

Full-Page App Shell

// layout.tsx
<html lang="en" className="h-full">
  <body className="h-full">{children}</body>
</html>

// page.tsx
<div className="flex h-full">
  <aside className="w-64 shrink-0 border-r overflow-y-auto">
    <nav>...</nav>
  </aside>
  <main className="flex-1 min-w-0 overflow-y-auto">
    {children}
  </main>
</div>

Dashboard with Header

<div className="flex flex-col h-screen">
  <header className="h-16 shrink-0 border-b">...</header>
  <div className="flex flex-1 min-h-0">
    <aside className="w-64 shrink-0 border-r overflow-y-auto">...</aside>
    <main className="flex-1 min-w-0 overflow-y-auto p-6">
      {children}
    </main>
  </div>
</div>

Card Grid

<div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
  {items.map(item => (
    <Card key={item.id}>
      <CardHeader><CardTitle>{item.title}</CardTitle></CardHeader>
      <CardContent>{item.content}</CardContent>
    </Card>
  ))}
</div>

Anti-Patterns

The Height Assumption

Using h-full without verifying ancestor chain. Fix: Trace to html. Use h-screen to break chain.

The Overflow Ignorance

Adding overflow-y-auto without min-h-0 on flex children. Fix: Flex children need min-h-0 to shrink.

The Import Guess

Guessing import paths like shadcn/ui. Fix: Check components.json for alias. Usually @/components/ui/*.

The Flat Compound

Flattening compound components (Dialog without DialogTrigger/DialogContent). Fix: Maintain required nesting structure.

Pre-Generation Checklist

Import alias known (@/components/ui/*)
html has h-full
body has h-full or min-h-full
Scroll containers have explicit height
Flex scroll children have min-h-0
Fixed elements have shrink-0

Related Skills

frontend-design - Design decisions before implementation
react-pwa - PWA features for React apps

Weekly Installs

145

Repository

jwynia/agent-skills

GitHub Stars

First Seen

Jan 20, 2026

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