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Antigravity Agent 504fd5fb42 [G1-Sync] Manual knowledge update

2026-05-10 22:08:15 +09:00

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title

단일 코드베이스를 통한 멀티 디바이스(모바일-데스크톱) 웹 인터페이스 구축

매 한 줄

"매 한 코드베이스, 매 device-aware rendering". 2026 modern web 은 매 mobile/desktop 분리 코드 X — 매 container query + adaptive component + capability-based fork 로 매 한 React/Svelte/Solid app 이 매 모든 viewport, 매 input modality (touch/mouse/pen), 매 connection (5G/3G) 에 매 최적화. Responsive(rule-based) 에서 Adaptive(behavior-based) 로 진화.

매 핵심

매 3-tier 전략

Layout (CSS): container query, clamp(), dvh/svh, logical property (inline-size).
Component: 매 same component, 매 different rendering — useMediaQuery + <Show>.
Capability fork: 매 touch vs mouse, 매 hover-capable, 매 prefers-reduced-motion.

매 결정 트리

Viewport-only difference?  → CSS container query (no JS)
Behavior different?        → Adaptive component (JS branching)
Entire flow different?     → Route-level fork (e.g. /m/checkout vs /checkout)
Feature unsupported?       → Progressive enhancement

매 응용

SaaS dashboard (admin desktop, support mobile).
E-commerce (mobile-first, desktop dense).
Internal tool (desktop primary, mobile read-only).

💻 패턴

Container query (modern, 2026 표준)

.card-host { container-type: inline-size; }

.card { display: grid; gap: 8px; }
@container (min-width: 480px) {
  .card { grid-template-columns: 120px 1fr; }
}
@container (min-width: 800px) {
  .card { grid-template-columns: 200px 1fr 200px; }
}

Adaptive component (capability-based)

import { useMediaQuery } from '@/hooks/useMediaQuery';

export function Navigation() {
  const isCoarse = useMediaQuery('(pointer: coarse)');
  const isWide   = useMediaQuery('(min-width: 1024px)');

  if (isWide && !isCoarse) return <DesktopSidebar />;
  if (isCoarse)            return <MobileBottomTabs />;  // thumb-reach
  return <CompactTopBar />;
}

Logical property + dvh (mobile keyboard 안전)

.modal {
  block-size: 100dvh;       /* 매 dynamic viewport — keyboard 등장 시 reflow */
  padding-inline: clamp(16px, 4vw, 32px);
  padding-block: env(safe-area-inset-top) env(safe-area-inset-bottom);
}

Input-aware interaction

function Tooltip({ children, label }: Props) {
  const canHover = useMediaQuery('(hover: hover)');
  // 매 touch 에선 hover X — long-press 로 fallback
  return canHover
    ? <HoverTooltip label={label}>{children}</HoverTooltip>
    : <LongPressTooltip label={label}>{children}</LongPressTooltip>;
}

Route-level adaptive (Next.js App Router)

// middleware.ts
import { userAgent } from 'next/server';
export function middleware(req) {
  const { device } = userAgent(req);
  if (device.type === 'mobile' && req.nextUrl.pathname === '/dashboard') {
    return NextResponse.rewrite(new URL('/m/dashboard', req.url));
  }
}

Network-aware loading

function HeroImage() {
  const conn = (navigator as any).connection;
  const slow = conn?.effectiveType === '2g' || conn?.saveData;
  return (
    <picture>
      {!slow && <source srcSet="/hero-2x.avif" type="image/avif" />}
      <img src={slow ? '/hero-low.jpg' : '/hero.jpg'} alt="" loading="lazy" />
    </picture>
  );
}

Density-aware list (virtualization)

import { useVirtualizer } from '@tanstack/react-virtual';

function ItemList({ items }) {
  const isMobile = useMediaQuery('(max-width: 768px)');
  const rowHeight = isMobile ? 72 : 48;          // touch target ≥ 44px
  const v = useVirtualizer({
    count: items.length,
    estimateSize: () => rowHeight,
    overscan: 8,
  });
  return /* virtualized rows */;
}

Server-side device hints (Client Hints, 2026)

Accept-CH: Sec-CH-UA-Mobile, Sec-CH-Viewport-Width, Sec-CH-DPR

// 매 server 가 매 mobile-optimized HTML 우선 stream
const isMobile = req.headers.get('Sec-CH-UA-Mobile') === '?1';

Reduced motion + prefers-color-scheme

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; transition: none !important; }
}

매 결정 기준

상황	Approach
Layout 크기만 차이	container query (JS X)
동작 (nav, modal) 차이	adaptive component
매 device 별 user journey 자체 다름	route-level fork or 별도 app
Email / SEO landing	server-rendered + Client Hints
Native-feel mobile + desktop	PWA + responsive
매 truly native	React Native Web + Tamagui (univ. UI)

기본값: container query first, useMediaQuery for behavior, route fork only when flows truly diverge.

🔗 Graph

부모: Frontend Architecture · Responsive Design
변형: Adaptive UI · Progressive Enhancement · PWA
응용: Large_Frontend_Projects · Tamagui · React Native Web
Adjacent: Container Queries · Client Hints · Core Web Vitals

🤖 LLM 활용

언제: design spec → component variant 자동 생성, breakpoint heuristic 추천, accessibility audit. 언제 X: 매 actual visual layout 결정 — designer 의 감각 + user testing 의 사용.

❌ 안티패턴

User-agent sniffing 만: 매 brittle, 매 future-proof X — Client Hints + capability query 의 사용.
Mobile-only / desktop-only fork 코드 2배: 매 maintenance 폭발 — adaptive component 우선.
Fixed vh: mobile address bar / keyboard 시 깨짐 — dvh/svh 의 사용.
Hover 전제 design: 매 touch user 에 매 hidden interaction.
44px 미만 touch target: WCAG fail.

🧪 검증 / 중복

Verified (W3C container queries Lvl 1, MDN 2026, web.dev responsive guide, Tamagui 1.x docs).
신뢰도 A.

🕓 Changelog

날짜	변경
2026-05-08	Phase 1
2026-05-10	Manual cleanup — full content (container queries, adaptive components, capability fork)

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