Construire la couche des jetons et de la configuration
Implémentez vos jetons de conception sous forme de variables CSS, reliez-les à la configuration Tailwind et testez-les en mode clair et en mode sombre.
Construire la couche des jetons et de la configuration est une leçon Tailwind CSS Academy gratuite sur CoddyKit. Ceci est la leçon 2 sur 4. Tu peux lire la leçon complète ci-dessous gratuitement — puis la pratiquer en direct dans le navigateur avec un éditeur de code intégré et un tuteur IA 24/7. Elle fait partie du parcours d'apprentissage Tailwind CSS Academy, et ta progression se synchronise sur le web et l'application CoddyKit. Le cours Tailwind CSS Academy comprend 4 leçons au total.
Certaines parties de cette leçon n'ont pas encore été traduites et s'affichent en anglais.
Token Layer Overview
The token layer is the bridge between your design decisions and Tailwind's utility generation. It consists of CSS custom properties (design tokens at the CSS level) and the Tailwind config that references those properties. When implemented correctly, swapping a theme requires only changing the CSS variable values — no Tailwind class names change, no component code changes.
Defining Primitive Tokens
Start by defining all raw color, spacing, and typography values in a tokens/primitives.css file using CSS custom properties. These primitives are not used directly by components — they exist only to feed the semantic token layer. Use a structured naming convention like --color-blue-500 for colors and --space-4 for spacing values.
/* tokens/primitives.css */
:root {
/* Color primitives */
--color-blue-50: #eff6ff;
--color-blue-100: #dbeafe;
--color-blue-500: #3b82f6;
--color-blue-600: #2563eb;
--color-blue-700: #1d4ed8;
--color-blue-900: #1e3a8a;
--color-gray-50: #f9fafb;
--color-gray-100: #f3f4f6;
--color-gray-500: #6b7280;
--color-gray-900: #111827;
--color-white: #ffffff;
--color-black: #000000;
/* Spacing primitives */
--space-1: 0.25rem;
--space-4: 1rem;
--space-8: 2rem;
}Defining Semantic Tokens
Semantic tokens give meaning to primitive values. Define them in a separate tokens/semantic.css file. Each semantic token references a primitive token and represents a purpose rather than a value. The same semantic token is overridden in a dark mode scope or a different brand scope to achieve theme switching.
/* tokens/semantic.css */
:root {
/* Brand colors */
--color-primary: var(--color-blue-600);
--color-primary-hover: var(--color-blue-700);
--color-primary-light: var(--color-blue-50);
/* Surface colors */
--color-surface: var(--color-white);
--color-surface-elevated: var(--color-gray-50);
/* Text colors */
--color-text-primary: var(--color-gray-900);
--color-text-secondary: var(--color-gray-500);
/* Border colors */
--color-border: var(--color-gray-100);
}Dark Mode Token Override
Override semantic tokens under the .dark class (for class strategy) or @media (prefers-color-scheme: dark) (for media strategy). Only semantic tokens change — primitive definitions remain unchanged. This is the power of the two-tier system: dark mode is implemented entirely in the token layer, with zero changes to component CSS or Tailwind classes.
/* tokens/semantic.css (dark mode overrides) */
:root {
--color-surface: #ffffff;
--color-text-primary: #111827;
--color-border: #f3f4f6;
}
.dark {
--color-surface: #111827; /* was white */
--color-text-primary: #f9fafb; /* was dark gray */
--color-border: #1f2937; /* was light gray */
--color-surface-elevated: #1f2937;
/* --color-primary unchanged: blue works in both modes */
}Wiring Tokens Into Tailwind Config
Reference CSS custom properties inside the Tailwind config's theme extension. Use var(--token-name) as the value. This means every Tailwind utility that references the theme token will use the CSS variable at runtime, enabling live theme switching without recompilation. The JIT engine generates classes with var() values in the output CSS.
// tailwind.config.js
module.exports = {
theme: {
extend: {
colors: {
primary: {
DEFAULT: 'var(--color-primary)',
hover: 'var(--color-primary-hover)',
light: 'var(--color-primary-light)',
},
surface: 'var(--color-surface)',
'text-primary': 'var(--color-text-primary)',
'text-secondary': 'var(--color-text-secondary)',
border: 'var(--color-border)',
},
},
},
};Using Token-Based Utilities in Components
With tokens wired into the config, you use them like any other Tailwind color. bg-surface applies the --color-surface CSS variable as a background. When the user switches to dark mode, the CSS variable value changes, and the background updates automatically without any component changes. Token-based classes look identical to built-in Tailwind classes in the markup.
<!-- Token-based Tailwind classes look just like built-in ones -->
<div class="bg-surface border border-border rounded-xl p-6">
<h2 class="text-text-primary font-semibold">Card Title</h2>
<p class="mt-2 text-text-secondary text-sm">Card description</p>
<button class="mt-4 rounded-lg bg-primary px-4 py-2 font-semibold text-white
hover:bg-primary-hover transition">
Primary Action
</button>
</div>Typography Tokens
Define font family, font size, line height, and font weight as tokens. Font families should reference a CSS variable so switching brand typefaces requires only a variable change. Font sizes can be extended in the Tailwind config with semantic names like text-display and text-caption alongside the default numeric scale.
/* tokens/semantic.css */
:root {
--font-sans: 'Inter', ui-sans-serif, system-ui, sans-serif;
--font-display: 'Cal Sans', var(--font-sans);
--font-mono: 'JetBrains Mono', ui-monospace, monospace;
}
// tailwind.config.js
theme: {
extend: {
fontFamily: {
sans: ['var(--font-sans)'],
display: ['var(--font-display)'],
mono: ['var(--font-mono)'],
},
fontSize: {
display: ['3.75rem', { lineHeight: '1.1', fontWeight: '700' }],
caption: ['0.75rem', { lineHeight: '1.5' }],
},
},
},Spacing and Radius Tokens
Extend the spacing and border radius scales with semantic names for component-level constants. Rather than remembering that cards use rounded-xl and badges use rounded-full, define radius.card: xl and radius.badge: full in the config. This makes component code self-documenting and ensures all cards use the same radius even when the value changes.
// tailwind.config.js
theme: {
extend: {
borderRadius: {
card: '0.75rem', // 12px — used by Card, Dialog
input: '0.5rem', // 8px — used by Input, Select
badge: '9999px', // pill — used by Badge, Tag
button: '0.5rem', // 8px — used by all Button variants
},
spacing: {
18: '4.5rem',
22: '5.5rem',
128: '32rem',
},
},
},Shadow Tokens
Define consistent shadow levels in the Tailwind config using semantic names. Shadows communicate visual hierarchy: none for flat elements, card for surface elements, elevated for dropdowns and modals, focus for interactive state indicators. This prevents arbitrary shadow values scattered across the codebase.
// tailwind.config.js
theme: {
extend: {
boxShadow: {
card: '0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1)',
elevated: '0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1)',
focus: '0 0 0 3px var(--color-primary-light)',
},
},
},
<!-- Use semantic shadow names -->
<div class="shadow-card hover:shadow-elevated transition-shadow">Validating Tokens in CI
Add a CI step that validates token integrity — checking that every semantic token references a primitive that exists, and that no semantic token is a raw hex value (which would bypass the two-tier system). A simple Node.js script that parses the CSS variable file and checks references can catch token drift before it reaches production.
// scripts/validate-tokens.js
const fs = require('fs');
const semanticCss = fs.readFileSync('tokens/semantic.css', 'utf8');
const primitiveCss = fs.readFileSync('tokens/primitives.css', 'utf8');
// Extract all var() references in semantic.css
const refs = [...semanticCss.matchAll(/var\(([^)]+)\)/g)].map(m => m[1].trim());
// Check each ref exists in primitives.css
const missing = refs.filter(ref => !primitiveCss.includes(ref + ':'));
if (missing.length > 0) {
console.error('Undefined primitive tokens:', missing);
process.exit(1);
}
console.log('All tokens valid.');Testing Dark Mode Token Switching
Test dark mode visually at the token level by toggling the .dark class on html and verifying that every semantic color surface, text, and border renders correctly. Use Playwright or Cypress to take screenshots with dark applied and compare against light mode baselines. Run this test suite whenever the token file changes to catch visual regressions immediately.
// playwright/dark-mode.spec.ts
import { test, expect } from '@playwright/test';
test('tokens switch correctly in dark mode', async ({ page }) => {
await page.goto('/tokens-preview');
// Light mode screenshot
await expect(page).toHaveScreenshot('tokens-light.png');
// Enable dark mode
await page.evaluate(() =>
document.documentElement.classList.add('dark')
);
// Dark mode screenshot
await expect(page).toHaveScreenshot('tokens-dark.png');
});Quick Check
Test your understanding of Tailwind CSS Mastery concepts from this lesson.
Lesson Recap
In this lesson you learned: defining primitive and semantic tokens as CSS custom properties in separate files, wiring semantic tokens into the Tailwind config using var() so they update at runtime, and implementing dark mode by overriding only semantic tokens under the .dark class. Next up we build the component library using these tokens.
Questions Fréquemment Posées
La leçon « Construire la couche des jetons et de la configuration » est-elle gratuite ?
Oui — le texte complet de « Construire la couche des jetons et de la configuration » est gratuit à lire ici sur le web. Pour la pratiquer de manière interactive (un éditeur de code intégré et un tuteur IA 24/7) et déverrouiller le reste du cours Tailwind CSS Academy, passe à CoddyKit PRO. Le cours Tailwind CSS Academy comprend 4 leçons au total.
Qu'est-ce que j'apprendrai dans « Construire la couche des jetons et de la configuration » ?
Implémentez vos jetons de conception sous forme de variables CSS, reliez-les à la configuration Tailwind et testez-les en mode clair et en mode sombre. Tu pratiques Tailwind CSS Academy avec du code pratique que tu exécutes directement dans le navigateur, et un tuteur IA 24/7 répond à tes questions au fur et à mesure que tu avances dans la leçon.
Dois-je avoir de l'expérience pour commencer Tailwind CSS Academy ?
Aucune expérience préalable n'est requise. Tailwind CSS Academy sur CoddyKit est structuré pour les débutants jusqu'aux apprenants avancés, donc tu peux commencer ici ou depuis le début et avancer à ton rythme. Ceci est la leçon 2 sur 4.
Combien de temps prend la leçon « Construire la couche des jetons et de la configuration » ?
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Peux-tu écrire et exécuter du code dans cette leçon Tailwind CSS Academy ?
Oui. Chaque leçon Tailwind CSS Academy inclut un éditeur de code intégré, tu écris et exécutes du vrai code directement dans ton navigateur et tu reçois des retours IA instantanés — aucune configuration locale requise.
Toutes les leçons de ce cours
- Planifier le système de conception
- Construire la couche des jetons et de la configuration
- Construire une bibliothèque de composants
- Documentation et transmission à l’équipe