git:20260913.4cedcda to v3.0.0

+ ---

+ name: design-system-architect

+ description: "Expert guide for designing, building, and maintaining scalable UI design systems with design tokens, headless primitives, Material Design 3 (M3), Tailwind v4 @theme, and WCAG 2.2 accessibility."

+ author: "Roedy Rustam"

+ version: "3.0.0"

+ ---

+

+ # Design System Architect (2026 Edition — shadcn/ui Registry)

+

+ [English](#english) | [Bahasa Indonesia](#bahasa-indonesia)

+

+ ---

+

+ <a name="english"></a>

+ ## English

+

+ ### Description

+ Expert guide for building and maintaining scalable UI design systems. Covers design tokens with OKLCH and Tailwind v4 `@theme`, **Material Design 3 (M3)** integration, headless component primitives (Radix UI, **Base UI 1.x**), **shadcn/ui registry** for distributable component libraries, CVA for type-safe variants, and WCAG 2.2 accessibility compliance.

+

+ ### Trigger Conditions

+ - Building a shared UI component library from scratch.

+ - Setting up design tokens (colors, typography, spacing) with Tailwind v4.

+ - Applying Material Design 3 (M3) principles (https://m3.material.io/).

+ - Using headless primitives (Radix UI, Base UI 1.x) with custom styling.

+ - Distributing components via the **shadcn/ui registry** format.

+ - Auditing a component library for WCAG 2.2 accessibility compliance.

+

+ ### Design Token Foundation (Tailwind v4 + OKLCH)

+

+ ```css

+ /* packages/ui/src/tokens.css */

+ @import "tailwindcss";

+

+ @theme {

+ /* --- Color System (OKLCH for wide-gamut P3 displays) --- */

+ /* Brand */

+ --color-brand-50: oklch(97% 0.015 250);

+ --color-brand-100: oklch(93% 0.04 250);

+ --color-brand-500: oklch(55% 0.22 250);

+ --color-brand-700: oklch(40% 0.18 250);

+ --color-brand-900: oklch(20% 0.10 250);

+

+ /* Semantic (maps to brand in light/dark automatically) */

+ --color-primary: var(--color-brand-500);

+ --color-primary-fg: oklch(100% 0 0); /* White */

+ --color-surface: oklch(100% 0 0); /* White */

+ --color-surface-2: oklch(97% 0.005 250);

+ --color-border: oklch(90% 0.01 250);

+ --color-text: oklch(15% 0.02 250);

+ --color-text-muted: oklch(50% 0.015 250);

+ --color-destructive: oklch(55% 0.22 25); /* Red */

+

+ /* --- Fluid Typography (clamp) --- */

+ --font-sans: "Inter Variable", "Inter", ui-sans-serif, system-ui, sans-serif;

+ --font-mono: "JetBrains Mono", "Fira Code", ui-monospace, monospace;

+ --font-size-xs: clamp(0.7rem, 0.17vi + 0.66rem, 0.75rem);

+ --font-size-sm: clamp(0.8rem, 0.17vi + 0.76rem, 0.875rem);

+ --font-size-base: clamp(0.9rem, 0.17vi + 0.86rem, 1rem);

+ --font-size-lg: clamp(1rem, 0.17vi + 0.96rem, 1.125rem);

+ --font-size-xl: clamp(1.1rem, 0.34vi + 1.02rem, 1.25rem);

+ --font-size-2xl: clamp(1.2rem, 0.69vi + 1.03rem, 1.5rem);

+ --font-size-3xl: clamp(1.5rem, 0.86vi + 1.29rem, 1.875rem);

+ --font-size-4xl: clamp(1.8rem, 1.03vi + 1.54rem, 2.25rem);

+

+ /* --- Spacing & Radius --- */

+ --radius-sm: 0.25rem;

+ --radius-md: 0.5rem;

+ --radius-lg: 0.75rem;

+ --radius-xl: 1rem;

+ --radius-full: 9999px;

+

+ /* --- Animation --- */

+ --animate-fade-in: fade-in 0.2s ease-out;

+ --animate-slide-up: slide-up 0.3s cubic-bezier(0.16, 1, 0.3, 1);

+ --animate-scale-in: scale-in 0.2s ease-out;

+ }

+

+ /* Dark mode tokens */

+ @variant dark {

+ :root {

+ --color-surface: oklch(10% 0.015 250);

+ --color-surface-2: oklch(15% 0.015 250);

+ --color-border: oklch(25% 0.02 250);

+ --color-text: oklch(95% 0.005 250);

+ --color-text-muted: oklch(60% 0.01 250);

+ }

+ }

+ ```

+

+ ### Material Design 3 (M3) Integration

+ When requested to follow **Material Design 3 (https://m3.material.io/)**, implement the following M3 token principles in your design system:

+ 1. **Color Roles**: Map Tailwind colors to M3 roles (`Primary`, `Secondary`, `Tertiary`, `Error`, `Surface`, `Outline`). Implement `On-*` colors for text/icons on top of those roles, and `*-Container` / `On-*-Container` for lower emphasis. Support Dynamic Color if applicable.

+ 2. **Typography Scale**: Use M3 naming conventions: `Display`, `Headline`, `Title`, `Body`, `Label` (each with `Large`, `Medium`, `Small` sizes).

+ 3. **Elevation & Surface**: Use M3 Elevation levels (0 to 5) implemented via subtle shadows and surface tint colors, not just heavy drop shadows.

+ 4. **Shapes**: Map `--radius-*` to M3 shape families: `None`, `Extra Small`, `Small`, `Medium`, `Large`, `Extra Large`, `Full`.

+

+ ### Component Architecture

+

+ #### Headless + Styled Pattern (Base UI 1.x / Radix UI)

+ Use headless primitives for accessibility, apply styles via Tailwind + CVA:

+

+ ```typescript

+ // packages/ui/src/button.tsx

+ import * as React from 'react';

+ import { cva, type VariantProps } from 'class-variance-authority';

+ import { cn } from '@/lib/utils';

+

+ const buttonVariants = cva(

+ // Base styles

+ 'inline-flex items-center justify-center gap-2 rounded-md font-medium transition-all focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-brand-500 focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50 select-none',

+ {

+ variants: {

+ variant: {

+ default: 'bg-primary text-primary-fg shadow-sm hover:brightness-110 active:brightness-90',

+ secondary: 'bg-surface-2 text-text border border-border hover:bg-surface hover:border-brand-300',

+ destructive: 'bg-destructive text-white hover:brightness-110',

+ ghost: 'hover:bg-surface-2 text-text',

+ link: 'text-primary underline-offset-4 hover:underline p-0 h-auto',

+ },

+ size: {

+ sm: 'h-8 px-3 text-xs',

+ md: 'h-9 px-4 text-sm',

+ lg: 'h-11 px-6 text-base',

+ icon: 'h-9 w-9',

+ },

+ },

+ defaultVariants: { variant: 'default', size: 'md' },

+ }

+ );

+

+ export interface ButtonProps

+ extends React.ButtonHTMLAttributes<HTMLButtonElement>,

+ VariantProps<typeof buttonVariants> {

+ asChild?: boolean;

+ }

+

+ const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(

+ ({ className, variant, size, ...props }, ref) => (

+ <button

+ ref={ref}

+ className={cn(buttonVariants({ variant, size }), className)}

+ {...props}

+ />

+ )

+ );

+ Button.displayName = 'Button';

+

+ export { Button, buttonVariants };

+ ```

+

+ ### Component Layout (Container Queries over Media Queries)

+ Avoid `@media` queries for internal component styling. Use **CSS Container Queries (`@container`)** so components respond to their wrapper, not the viewport. This makes components truly reusable anywhere.

+ ```tsx

+ // Example of a container-aware component using Tailwind v4

+ <div className="@container">

+ <div className="flex flex-col @md:flex-row gap-4">

+ <div className="p-4 bg-surface rounded-xl">Fluid Card</div>

+ </div>

+ </div>

+ ```

+

+ ### shadcn/ui Registry — Distributable Components (2026)

+

+ shadcn/ui v2 introduces a **registry** system — distribute your components as a shareable library that others can `npx shadcn add` into their projects:

+

+ ```json

+ // registry.json — defines your component library

+ {

+ "$schema": "https://ui.shadcn.com/schema/registry.json",

+ "name": "my-ui",

+ "homepage": "https://ui.myapp.com",

+ "items": [

+ {

+ "name": "button",

+ "type": "registry:ui",

+ "title": "Button",

+ "description": "Multi-variant button component with CVA",

+ "files": [

+ { "path": "registry/ui/button.tsx", "type": "registry:ui" }

+ ],

+ "tailwind": {

+ "config": {

+ "theme": {

+ "extend": {

+ "colors": { "primary": "hsl(var(--primary))" }

+ }

+ }

+ }

+ }

+ }

+ ]

+ }

+ ```

+

+ ```bash

+ # Users install your components directly

+ npx shadcn add https://ui.myapp.com/registry.json button

+ npx shadcn add https://ui.myapp.com/registry.json card dialog

+ ```

+

+ ### Base UI 1.x — Unstyled Accessibility Primitives

+ Base UI (from MUI team) is the 2026 alternative to Radix UI with React 19 native support:

+ ```typescript

+ import { Dialog, Button, Select } from '@base-ui-components/react';

+

+ // Fully unstyled — apply any className/Tailwind styles

+ <Dialog.Root>

+ <Dialog.Trigger render={<Button />}>Open Dialog</Dialog.Trigger>

+ <Dialog.Portal>

+ <Dialog.Backdrop className="fixed inset-0 bg-black/50 animate-fade-in" />

+ <Dialog.Popup className="fixed inset-0 m-auto h-fit max-w-md rounded-xl bg-surface p-6 shadow-xl animate-slide-up">

+ <Dialog.Title className="text-lg font-semibold">Title</Dialog.Title>

+ <Dialog.Close className="absolute right-4 top-4">✕</Dialog.Close>

+ </Dialog.Popup>

+ </Dialog.Portal>

+ </Dialog.Root>

+ ```

+

+ ### The 4 Pillars of UI Components Catalog

+

+ #### 1. Input Controls (Buttons, Inputs, Selects)

+ - **Visual States**: Explicitly define `default`, `hover`, `active`, `focus`, `disabled`, and `error`.

+ - **Validation**: Display inline validation on blur using `aria-invalid` and `aria-describedby` (React Hook Form + Zod).

+ - **Touch Targets**: Minimum 44×44px (WCAG 2.5.8), M3 recommends 48×48px.

+ - **M3 Integration**: Use M3 button tiers (Filled, Tonal, Elevated, Outlined, Text) and FABs for primary actions.

+

+ #### 2. Navigation (Navbars, Tabs, Command Palettes)

+ - **Command Palette**: Add `⌘K` command menu via `cmdk`.

+ - **Responsive Layout**: Bottom nav (<768px), collapsible rail (tablet), full sidebar (desktop).

+ - **Smooth Page Transitions**: In Next.js 15, leverage `<Link viewTransition>` for layout morphing.

+ - **Active State**: Clear high-contrast indicator with `role="navigation"` and `aria-current="page"`.

+

+ #### 3. Information & Feedback (Toasts, Skeletons, Empty States)

+ - **Toasts**: Use **Sonner**; cap at max 3 concurrent visible toasts. Auto-dismiss success, keep errors persistent.

+ - **Loading UX**: Use layout-matching Skeletons over spinners to eliminate Cumulative Layout Shift (CLS).

+ - **Empty States**: Clear illustration, contextual message, and primary CTA.

+

+ #### 4. Containers & Layout (Cards, Modals, Sheets)

+ - **Modals & Dialogs**: Radix UI / Base UI Dialog with automatic focus trapping and background scroll lock.

+ - **Sheets / Drawers**: Bottom sheet for mobile secondary actions; side sheet on desktop.

+ - **Cards**: Flat border or subtle shadow (`shadow-sm`); avoid heavy drop shadows in light mode.

+

+ ### WCAG 2.2 Accessibility Checklist

+ - [ ] All interactive elements have visible focus indicators (`ring-2`).

+ - [ ] Color contrast ≥ 4.5:1 (text), ≥ 3:1 (large text / UI components).

+ - [ ] All images have `alt` text; decorative images have `alt=""`.

+ - [ ] All form inputs have associated `<label>` elements.

+ - [ ] Keyboard navigation works for all interactions (Tab, Enter, Space, Escape, Arrow keys).

+ - [ ] `aria-label` or `aria-labelledby` on icon buttons.

+ - [ ] Modals trap focus and restore it on close.

+ - [ ] No content relies on color alone to convey information.

+ - [ ] Touch targets ≥ 24×24px (WCAG 2.2 new requirement).

+

+ ---

+

+ <a name="bahasa-indonesia"></a>

+ ## Bahasa Indonesia

+

+ ### Integrasi Orkestrasi

+ Terhubung dan mengorkestrasi skill domain yang relevan seperti `brainstorming`, `zero-to-prod-orchestrator`, dan `session-memory-manager` untuk memastikan eksekusi yang kohesif.

+

+ ### Deskripsi

+ Panduan ahli untuk membangun dan memelihara design system UI yang skalabel. Mencakup design token dengan OKLCH dan `@theme` Tailwind v4, primitif komponen headless (Radix UI, **Base UI 1.x**), **registry shadcn/ui** untuk distribusi library komponen, CVA untuk varian type-safe, dan kepatuhan aksesibilitas WCAG 2.2.

+

+ ### Kondisi Pemicu

+ - Membangun library komponen UI bersama dari awal.

+ - Menyiapkan design token (warna, tipografi, spacing) dengan Tailwind v4.

+ - Menerapkan prinsip Material Design 3 (M3) (https://m3.material.io/).

+ - Menggunakan primitif headless (Radix UI, Base UI 1.x) dengan styling kustom.

+ - Mendistribusikan komponen via format **registry shadcn/ui**.

+ - Mengaudit library komponen untuk kepatuhan aksesibilitas WCAG 2.2.

+

+ ### Fondasi Design Token (Tailwind v4 + OKLCH)

+ Definisikan semua token di CSS menggunakan direktif `@theme`. Gunakan warna OKLCH untuk tampilan P3 wide-gamut. Definisikan token semantik (`--color-primary`, `--color-surface`, `--color-border`) yang secara otomatis beradaptasi antara mode terang/gelap melalui `@variant dark`.

+

+ ### Integrasi Material Design 3 (M3)

+ Jika diminta mengikuti **Material Design 3 (https://m3.material.io/)**, terapkan prinsip token M3 berikut:

+ 1. **Peran Warna (Color Roles)**: Petakan warna ke peran M3 (`Primary`, `Secondary`, `Tertiary`, `Error`, `Surface`, `Outline`). Gunakan warna `On-*` untuk teks di atasnya, dan `*-Container` / `On-*-Container` untuk penekanan lebih rendah.

+ 2. **Skala Tipografi**: Gunakan penamaan M3: `Display`, `Headline`, `Title`, `Body`, `Label` (dengan ukuran `Large`, `Medium`, `Small`).

+ 3. **Elevasi & Permukaan**: Gunakan tingkat Elevasi M3 (0 hingga 5) melalui bayangan halus dan warna tint permukaan (surface tint).

+ 4. **Bentuk (Shapes)**: Petakan `--radius-*` ke keluarga bentuk M3: `None`, `Extra Small`, `Small`, `Medium`, `Large`, `Extra Large`, `Full`.

+

+ ### Arsitektur Komponen

+ Gunakan pola Headless + Styled: primitif headless (Base UI/Radix) untuk aksesibilitas, gaya melalui Tailwind + CVA (class-variance-authority) untuk varian type-safe.

+

+ **Container Queries (`@container`)**: DILARANG keras menggunakan `@media` query (misal `md:`, `lg:`) untuk layout di dalam sebuah komponen. Gunakan **Container Queries (`@md:`, `@lg:`)** agar komponen dapat menyesuaikan diri dengan lebar pembungkusnya, bukan lebar layar secara keseluruhan. Ini membuat komponen Anda 100% *reusable*.

+

+ ### Registry shadcn/ui — Komponen yang Dapat Didistribusikan (2026)

+ shadcn/ui v2 memperkenalkan sistem registry — distribusikan komponen Anda sebagai library yang dapat dibagikan sehingga orang lain dapat menginstalnya dengan `npx shadcn add [url] [komponen]`.

+

+ ### Base UI 1.x — Primitif Aksesibilitas Tanpa Gaya

+ Base UI (dari tim MUI) adalah alternatif Radix UI untuk 2026 dengan dukungan native React 19. Sepenuhnya tanpa gaya — terapkan className/Tailwind apapun.

+

+ ### Katalog 4 Pilar Komponen UI

+ 1. **Input Controls (Tombol, Input, Select)**: Definisikan status visual (`default`, `hover`, `active`, `focus`, `disabled`, `error`). Tampilkan validasi inline on-blur (`aria-invalid`, `aria-describedby` via React Hook Form + Zod). Target sentuh minimal 44x44px.

+ 2. **Navigasi (Navbar, Tab, Command Palette)**: Sediakan menu perintah `⌘K` dengan `cmdk`. Layout responsif (navigasi bawah di mobile, rail di tablet, sidebar penuh di desktop). Transisi halaman halus via `<Link viewTransition>` di Next.js 15.

+ 3. **Informasi & Feedback (Toast, Skeleton, Empty State)**: Gunakan **Sonner** untuk toast (maksimal 3 bersamaan). Gunakan Skeleton sesuai tata letak untuk mencegah CLS dibanding spinner.

+ 4. **Wadah & Layout (Card, Modal, Sheet)**: Dialog/Modal dengan penguncian scroll dan focus trapping otomatis (Base UI/Radix). Gunakan bottom sheet di mobile dan side sheet di desktop.

+

+ ### Checklist Aksesibilitas WCAG 2.2

+ - Semua elemen interaktif memiliki indikator fokus yang terlihat.

+ - Kontras warna ≥ 4.5:1 (teks), ≥ 3:1 (komponen UI).

+ - Semua input form memiliki elemen `<label>` terkait.

+ - Navigasi keyboard berfungsi untuk semua interaksi.

+ - Modal menjebak fokus dan memulihkannya saat ditutup.

+ - Target sentuh ≥ 24×24px (persyaratan baru WCAG 2.2).

+

+

+ ## Orchestration & Integration