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Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-20 23:52:15 +09:00

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title

유지보수 가능한 CSS 아키텍처(CSS Modules & Tailwind)

매 한 줄

"매 utility-first × scoped-modules 의 hybrid 가 매 2026 의 default". CSS Modules 의 file-scoped 격리와 Tailwind v4 의 utility token system 을 결합하면, global cascade 의 fragility 없이도 매 design system consistency 를 확보할 수 있다. CSS-in-JS 의 runtime cost 없이 build-time 으로 모든 게 resolve 된다.

매 핵심

매 layering

Tokens layer: Tailwind v4 @theme directive — colors, spacing, type scale.
Utilities layer: flex, gap-4, text-sm — 90% 의 styling.
Components layer: CSS Modules .button { ... } — 매 multi-property cluster 의 reuse.
Overrides layer: page-specific 의 minimal exception.

매 결정 트리

1-3 utilities → inline className.
4+ utilities 의 repeated 사용 → CSS Module class + @apply (Tailwind v4) or extract component.
complex states (hover, focus-within, group) → CSS Module + &:hover nested.
design token (color, spacing) → @theme 의 single source.

매 응용

Next.js App Router 의 *.module.css 와 Tailwind 병행.
Vite + React 의 component-scoped styles.
Storybook 의 visual regression 안정화.

💻 패턴

Tailwind v4 `@theme` setup

/* app/globals.css */
@import "tailwindcss";

@theme {
  --color-brand-50: oklch(97% 0.02 250);
  --color-brand-500: oklch(60% 0.18 250);
  --color-brand-900: oklch(25% 0.10 250);
  --spacing-gutter: 1.5rem;
  --font-display: "Inter Display", sans-serif;
}

CSS Module + Tailwind `@apply`

/* Button.module.css */
.primary {
  @apply inline-flex items-center justify-center
         px-4 py-2 rounded-lg
         bg-brand-500 text-white font-medium
         hover:bg-brand-600 active:bg-brand-700
         disabled:opacity-50 disabled:cursor-not-allowed
         transition-colors;
}

.iconLeft { @apply -ml-1 mr-2 h-4 w-4; }

// Button.tsx
import styles from "./Button.module.css";
import clsx from "clsx";

export function Button({ icon, children, className, ...rest }) {
  return (
    <button className={clsx(styles.primary, className)} {...rest}>
      {icon && <span className={styles.iconLeft}>{icon}</span>}
      {children}
    </button>
  );
}

Variant pattern (CVA)

import { cva } from "class-variance-authority";

export const button = cva(
  "inline-flex items-center justify-center rounded-lg font-medium transition-colors",
  {
    variants: {
      intent: {
        primary: "bg-brand-500 text-white hover:bg-brand-600",
        ghost:   "bg-transparent text-brand-700 hover:bg-brand-50",
        danger:  "bg-red-600 text-white hover:bg-red-700",
      },
      size: {
        sm: "h-8 px-3 text-sm",
        md: "h-10 px-4 text-base",
        lg: "h-12 px-6 text-lg",
      },
    },
    defaultVariants: { intent: "primary", size: "md" },
  }
);

Nested module styles

/* Card.module.css */
.card {
  @apply rounded-2xl bg-white shadow-md p-6;

  & > .title {
    @apply text-lg font-semibold mb-2;
  }

  &:hover .title {
    @apply text-brand-600;
  }
}

Container queries (2026 default)

.grid {
  @apply grid gap-4;
  container-type: inline-size;
}

@container (min-width: 640px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
}
@container (min-width: 1024px) {
  .grid { grid-template-columns: repeat(4, 1fr); }
}

Naming convention

features/checkout/
  CheckoutForm.tsx
  CheckoutForm.module.css   ← scoped to feature
shared/ui/
  Button.tsx
  Button.module.css         ← reusable primitives

매 결정 기준

상황	Approach
one-off utility cluster	inline Tailwind classes
reused 3+ places, simple	extract React component
reused, complex states	CSS Module + `@apply`
design token	`@theme` directive
dynamic runtime values	CSS variables on element
framework-agnostic	CSS Modules only (no Tailwind dep)

기본값: Tailwind v4 utilities + CSS Modules for multi-state primitives.

🔗 Graph

부모: CSS_Architecture_and_Styling · CSS_Architecture_and_Styling
변형: Tailwind CSS v4 · CSS_Architecture_and_Styling
응용: Storybook · Next.js
Adjacent: CSS_Architecture_and_Styling · CSS_Architecture_and_Styling

🤖 LLM 활용

언제: design system 의 component library scaffold, variant matrix 생성, refactor of legacy global CSS. 언제 X: extreme custom animation timeline (use Framer Motion), CSS art (use raw CSS).

❌ 안티패턴

Global override soup: !important chains in globals.css — cascade hell.
Atomic CSS without tokens: utilities referencing magic numbers mt-[17px] everywhere.
CSS-in-JS runtime in 2026: emotion/styled-components 의 runtime cost — prefer build-time (vanilla-extract, Tailwind).
Module + Tailwind 의 random mix: same component 에 styled-jsx, .module.css, inline 모두 사용.

🧪 검증 / 중복

Verified (Tailwind v4 docs 2026, Next.js 15 patterns, MDN CSS Modules).
신뢰도 A.

🕓 Changelog

날짜	변경
2026-05-08	Phase 1
2026-05-10	Manual cleanup — Tailwind v4 + CSS Modules hybrid 의 substantive content.

5.8 KiB Raw Blame History Unescape Escape