From 83c0ba3e74eab8d4a9764273bb20123335109dd2 Mon Sep 17 00:00:00 2001
From: Lucas Rayan <lucas.guerra@pop-pe.rnp.br>
Date: Sun, 1 Nov 2026 09:31:22 -0300
Subject: [PATCH] feat(i18n): routing and localization infrastructure (phase 1)

Implement Phase 1 of i18n spec:
- Configure next-intl with 6 locales (pt, en, es, fr, de, zh-CN) and pathnames
- Move routes to app/[locale] structure with localized layouts and metadata
- Add middleware for root language negotiation (307), legacy redirects (308), and 404 for non-pt book
- Implement language selector dropdown in header with cookie persistence
- Add system typography rules for zh-CN and word-break/hyphenation for de/fr

Co-Authored-By: Antigravity <noreply@google.com>
---
 CHANGELOG.md                                 |   8 +
 app/{ => [locale]}/catalogo/layout.jsx       |   0
 app/{ => [locale]}/catalogo/page.jsx         |   0
 app/{ => [locale]}/comparacao/layout.jsx     |   0
 app/{ => [locale]}/comparacao/page.jsx       |   0
 app/{ => [locale]}/componentes/layout.jsx    |   0
 app/{ => [locale]}/componentes/page.jsx      |   0
 app/{ => [locale]}/diagnostico/layout.jsx    |   0
 app/{ => [locale]}/diagnostico/page.jsx      |   0
 app/{ => [locale]}/frameworks/[key]/page.jsx |   0
 app/{ => [locale]}/frameworks/layout.jsx     |   0
 app/{ => [locale]}/frameworks/page.jsx       |   0
 app/{ => [locale]}/glossario/layout.jsx      |   0
 app/{ => [locale]}/glossario/page.jsx        |   0
 app/[locale]/layout.jsx                      | 162 ++++
 app/{ => [locale]}/livro/page.jsx            |  43 +-
 app/{ => [locale]}/not-found.jsx             |   0
 app/{ => [locale]}/page.jsx                  | 143 ++--
 app/{ => [locale]}/seletor/layout.jsx        |   0
 app/{ => [locale]}/seletor/page.jsx          |   0
 app/{ => [locale]}/series/[key]/page.jsx     |   0
 app/{ => [locale]}/series/layout.jsx         |   0
 app/{ => [locale]}/series/page.jsx           |   0
 app/{ => [locale]}/sobre/page.jsx            |   0
 app/globals.css                              |  24 +
 app/layout.jsx                               | 134 ----
 components/Footer.jsx                        | 145 ++--
 components/Header.jsx                        |  97 ++-
 components/LanguageSelector.jsx              | 232 ++++++
 i18n/navigation.js                           |   4 +
 i18n/request.js                              |  26 +
 i18n/routing.js                              | 101 +++
 messages/pt.json                             |   1 +
 middleware.js                                | 102 +++
 next.config.mjs                              |   7 +-
 package-lock.json                            | 782 ++++++++++++++++++-
 package.json                                 |   1 +
 scripts/auditar-paginas.mjs                  |  11 +-
 38 files changed, 1699 insertions(+), 324 deletions(-)
 rename app/{ => [locale]}/catalogo/layout.jsx (100%)
 rename app/{ => [locale]}/catalogo/page.jsx (100%)
 rename app/{ => [locale]}/comparacao/layout.jsx (100%)
 rename app/{ => [locale]}/comparacao/page.jsx (100%)
 rename app/{ => [locale]}/componentes/layout.jsx (100%)
 rename app/{ => [locale]}/componentes/page.jsx (100%)
 rename app/{ => [locale]}/diagnostico/layout.jsx (100%)
 rename app/{ => [locale]}/diagnostico/page.jsx (100%)
 rename app/{ => [locale]}/frameworks/[key]/page.jsx (100%)
 rename app/{ => [locale]}/frameworks/layout.jsx (100%)
 rename app/{ => [locale]}/frameworks/page.jsx (100%)
 rename app/{ => [locale]}/glossario/layout.jsx (100%)
 rename app/{ => [locale]}/glossario/page.jsx (100%)
 create mode 100644 app/[locale]/layout.jsx
 rename app/{ => [locale]}/livro/page.jsx (93%)
 rename app/{ => [locale]}/not-found.jsx (100%)
 rename app/{ => [locale]}/page.jsx (71%)
 rename app/{ => [locale]}/seletor/layout.jsx (100%)
 rename app/{ => [locale]}/seletor/page.jsx (100%)
 rename app/{ => [locale]}/series/[key]/page.jsx (100%)
 rename app/{ => [locale]}/series/layout.jsx (100%)
 rename app/{ => [locale]}/series/page.jsx (100%)
 rename app/{ => [locale]}/sobre/page.jsx (100%)
 delete mode 100644 app/layout.jsx
 create mode 100644 components/LanguageSelector.jsx
 create mode 100644 i18n/navigation.js
 create mode 100644 i18n/request.js
 create mode 100644 i18n/routing.js
 create mode 100644 messages/pt.json
 create mode 100644 middleware.js

diff --git a/CHANGELOG.md b/CHANGELOG.md
index d4778f9..7c645eb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,14 @@ Tudo o que muda de relevante no ESPDocs está aqui. O formato segue o
 
 ## [Não lançado]
 
+### Adicionado
+
+- Infraestrutura de internacionalização com `next-intl` (Fase 1):
+  - Roteamento com prefixo de idioma sob `app/[locale]/`, com 6 locales declarados (`pt`, `en`, `es`, `fr`, `de`, `zh-CN`).
+  - `middleware.js` com negociação de idioma na raiz por cookie `NEXT_LOCALE` e cabeçalho `Accept-Language` (com pesos `q`), redirecionamento 308 de URLs antigas sem prefixo para `/pt/`, e retorno 404 para `/livro` fora do português.
+  - Seletor de idiomas acessível no cabeçalho com atalho para os 6 idiomas, persistência via cookie `NEXT_LOCALE` e mapeamento de rota correspondente.
+  - Regras de tipografia de sistema CJK para `zh-CN` e hifenização/quebra de palavras para `de` e `fr`.
+
 ## [1.1.0] - 2026-11-01
 
 ### Adicionado
diff --git a/app/catalogo/layout.jsx b/app/[locale]/catalogo/layout.jsx
similarity index 100%
rename from app/catalogo/layout.jsx
rename to app/[locale]/catalogo/layout.jsx
diff --git a/app/catalogo/page.jsx b/app/[locale]/catalogo/page.jsx
similarity index 100%
rename from app/catalogo/page.jsx
rename to app/[locale]/catalogo/page.jsx
diff --git a/app/comparacao/layout.jsx b/app/[locale]/comparacao/layout.jsx
similarity index 100%
rename from app/comparacao/layout.jsx
rename to app/[locale]/comparacao/layout.jsx
diff --git a/app/comparacao/page.jsx b/app/[locale]/comparacao/page.jsx
similarity index 100%
rename from app/comparacao/page.jsx
rename to app/[locale]/comparacao/page.jsx
diff --git a/app/componentes/layout.jsx b/app/[locale]/componentes/layout.jsx
similarity index 100%
rename from app/componentes/layout.jsx
rename to app/[locale]/componentes/layout.jsx
diff --git a/app/componentes/page.jsx b/app/[locale]/componentes/page.jsx
similarity index 100%
rename from app/componentes/page.jsx
rename to app/[locale]/componentes/page.jsx
diff --git a/app/diagnostico/layout.jsx b/app/[locale]/diagnostico/layout.jsx
similarity index 100%
rename from app/diagnostico/layout.jsx
rename to app/[locale]/diagnostico/layout.jsx
diff --git a/app/diagnostico/page.jsx b/app/[locale]/diagnostico/page.jsx
similarity index 100%
rename from app/diagnostico/page.jsx
rename to app/[locale]/diagnostico/page.jsx
diff --git a/app/frameworks/[key]/page.jsx b/app/[locale]/frameworks/[key]/page.jsx
similarity index 100%
rename from app/frameworks/[key]/page.jsx
rename to app/[locale]/frameworks/[key]/page.jsx
diff --git a/app/frameworks/layout.jsx b/app/[locale]/frameworks/layout.jsx
similarity index 100%
rename from app/frameworks/layout.jsx
rename to app/[locale]/frameworks/layout.jsx
diff --git a/app/frameworks/page.jsx b/app/[locale]/frameworks/page.jsx
similarity index 100%
rename from app/frameworks/page.jsx
rename to app/[locale]/frameworks/page.jsx
diff --git a/app/glossario/layout.jsx b/app/[locale]/glossario/layout.jsx
similarity index 100%
rename from app/glossario/layout.jsx
rename to app/[locale]/glossario/layout.jsx
diff --git a/app/glossario/page.jsx b/app/[locale]/glossario/page.jsx
similarity index 100%
rename from app/glossario/page.jsx
rename to app/[locale]/glossario/page.jsx
diff --git a/app/[locale]/layout.jsx b/app/[locale]/layout.jsx
new file mode 100644
index 0000000..31e60b2
--- /dev/null
+++ b/app/[locale]/layout.jsx
@@ -0,0 +1,162 @@
+import { notFound } from "next/navigation";
+import { JetBrains_Mono, Manrope, Space_Grotesk } from "next/font/google";
+import { NextIntlClientProvider } from "next-intl";
+import { getMessages } from "next-intl/server";
+import { routing } from "@/i18n/routing";
+import "../globals.css";
+import Providers from "@/components/Providers";
+import { SITE, jsonLd } from "@/lib/seo";
+
+const spaceGrotesk = Space_Grotesk({
+	subsets: ["latin"],
+	variable: "--font-space-grotesk",
+	display: "swap",
+	weight: ["500", "600", "700"],
+});
+
+const manrope = Manrope({
+	subsets: ["latin"],
+	variable: "--font-manrope",
+	display: "swap",
+	weight: ["400", "500", "600", "700"],
+});
+
+const jetbrainsMono = JetBrains_Mono({
+	subsets: ["latin"],
+	variable: "--font-jetbrains",
+	display: "swap",
+	weight: ["400", "500", "600"],
+});
+
+const LANG_MAP = {
+	pt: "pt-BR",
+	en: "en",
+	es: "es-419",
+	fr: "fr",
+	de: "de",
+	"zh-CN": "zh-CN",
+};
+
+export function generateStaticParams() {
+	return routing.locales.map((locale) => ({ locale }));
+}
+
+export async function generateMetadata({ params }) {
+	const { locale } = await params;
+	const ogLocaleMap = {
+		pt: "pt_BR",
+		en: "en_US",
+		es: "es_419",
+		fr: "fr_FR",
+		de: "de_DE",
+		"zh-CN": "zh_CN",
+	};
+
+	return {
+		metadataBase: new URL(SITE.url),
+		title: {
+			default: "ESPDocs · Documentação do ESP32 em português",
+			template: "%s · ESPDocs",
+		},
+		description:
+			"Especificações, pinagem, comparação e seleção das 12 séries de microcontroladores ESP32, em português brasileiro. Datasheets, periféricos, segurança em hardware e diagramas de conexão.",
+		applicationName: "ESPDocs",
+		authors: [{ name: "Lucas Rayan Guerra", url: "https://lucasrguerra.dev.br" }],
+		creator: "Lucas Rayan Guerra",
+		publisher: "Ciência Embarcada",
+		category: "technology",
+		keywords: [
+			"ESP32", "ESP32 português", "documentação ESP32", "pinout ESP32",
+			"ESP32-S3", "ESP32-C3", "ESP32-C6", "ESP32-P4", "ESP32-H2",
+			"comparar ESP32", "qual ESP32 escolher", "datasheet ESP32",
+			"microcontrolador", "Espressif", "ESP-IDF", "IoT", "sistemas embarcados",
+		],
+		alternates: { canonical: `/${locale}` },
+		openGraph: {
+			type: "website",
+			locale: ogLocaleMap[locale] || "pt_BR",
+			url: `${SITE.url}/${locale}`,
+			siteName: SITE.nome,
+			title: "ESPDocs · Documentação do ESP32 em português",
+			description:
+				"Especificações, pinagem, comparação e seleção das 12 séries de microcontroladores ESP32, em português brasileiro.",
+		},
+		twitter: {
+			card: "summary_large_image",
+			title: "ESPDocs · Documentação do ESP32 em português",
+			description:
+				"Especificações, pinagem, comparação e seleção das 12 séries de ESP32, em português.",
+		},
+		robots: {
+			index: true,
+			follow: true,
+			googleBot: {
+				index: true,
+				follow: true,
+				"max-image-preview": "large",
+				"max-snippet": -1,
+				"max-video-preview": -1,
+			},
+		},
+		icons: {
+			icon: [
+				{ url: "/favicon.ico", sizes: "48x48", type: "image/x-icon" },
+				{ url: "/favicon-48x48.png", sizes: "48x48", type: "image/png" },
+				{ url: "/favicon-32x32.png", sizes: "32x32", type: "image/png" },
+				{ url: "/favicon-16x16.png", sizes: "16x16", type: "image/png" },
+				{ url: "/icon-192.png", sizes: "192x192", type: "image/png" },
+				{ url: "/icon-512.png", sizes: "512x512", type: "image/png" },
+				{ url: "/icon.svg", type: "image/svg+xml" },
+			],
+			apple: [
+				{ url: "/apple-touch-icon.png", sizes: "180x180", type: "image/png" },
+			],
+			shortcut: "/favicon.ico",
+		},
+		manifest: "/site.webmanifest",
+		formatDetection: { telephone: false, address: false, email: false },
+	};
+}
+
+export const viewport = {
+	themeColor: [
+		{ media: "(prefers-color-scheme: light)", color: "#f5f6f8" },
+		{ media: "(prefers-color-scheme: dark)", color: "#07090d" },
+	],
+};
+
+export default async function RootLayout({ children, params }) {
+	const { locale } = await params;
+	if (!routing.locales.includes(locale)) {
+		notFound();
+	}
+
+	const lang = LANG_MAP[locale] || locale;
+	const messages = await getMessages();
+
+	return (
+		<html lang={lang} className={`${spaceGrotesk.variable} ${manrope.variable} ${jetbrainsMono.variable}`} suppressHydrationWarning>
+			<head>
+				{/* Dados estruturados do site e da organização. É o que permite ao
+				    Google montar o box de busca interna e entender a autoria. */}
+				<script
+					type="application/ld+json"
+					dangerouslySetInnerHTML={{ __html: JSON.stringify(jsonLd.siteESociedade()) }}
+				/>
+			</head>
+			<body className="font-sans antialiased bg-canvas text-ink overflow-x-clip" suppressHydrationWarning>
+				<a
+					href="#conteudo"
+					className="sr-only focus:not-sr-only focus:fixed focus:left-4 focus:top-4 focus:z-[200] focus:rounded-full focus:bg-ink focus:px-5 focus:py-3 focus:text-sm focus:font-semibold focus:text-canvas"
+				>
+					Pular para o conteúdo
+				</a>
+				<NextIntlClientProvider locale={locale} messages={messages}>
+					<Providers>
+						{children}
+					</Providers>
+				</NextIntlClientProvider>
+			</body>
+		</html>
+	);
+}
diff --git a/app/livro/page.jsx b/app/[locale]/livro/page.jsx
similarity index 93%
rename from app/livro/page.jsx
rename to app/[locale]/livro/page.jsx
index e6a51f4..14afcbc 100644
--- a/app/livro/page.jsx
+++ b/app/[locale]/livro/page.jsx
@@ -1,3 +1,4 @@
+import { notFound } from "next/navigation";
 import Header from "@/components/Header";
 import Footer from "@/components/Footer";
 import BookCover from "@/components/BookCover";
@@ -16,19 +17,29 @@ import {
 	Wifi,
 } from "lucide-react";
 
-export const metadata = paginaMeta({
-	titulo: "Microcontroladores ESP32, o livro",
-	descricao:
-		"Conheça o livro Microcontroladores ESP32: conectividade, eficiência e desempenho. 12 partes e 78 capítulos em português sobre arquitetura, energia, rádio, periféricos e firmware.",
-	caminho: "/livro",
-	keywords: [
-		"livro ESP32",
-		"Microcontroladores ESP32",
-		"livro de ESP32 em português",
-		"Lucas Rayan Guerra",
-		"Ciência Embarcada",
-	],
-});
+export function generateStaticParams() {
+	return [{ locale: "pt" }];
+}
+
+export async function generateMetadata({ params }) {
+	const { locale } = await params;
+	if (locale !== "pt") {
+		return {};
+	}
+	return paginaMeta({
+		titulo: "Microcontroladores ESP32, o livro",
+		descricao:
+			"Conheça o livro Microcontroladores ESP32: conectividade, eficiência e desempenho. 12 partes e 78 capítulos em português sobre arquitetura, energia, rádio, periféricos e firmware.",
+		caminho: "/pt/livro",
+		keywords: [
+			"livro ESP32",
+			"Microcontroladores ESP32",
+			"livro de ESP32 em português",
+			"Lucas Rayan Guerra",
+			"Ciência Embarcada",
+		],
+	});
+}
 
 const CHAPTERS = [
 	{
@@ -128,7 +139,11 @@ const FACTS = [
 	["ISBN", SITE.livroIsbn],
 ];
 
-export default function LivroPage() {
+export default async function LivroPage({ params }) {
+	const { locale } = await params;
+	if (locale !== "pt") {
+		notFound();
+	}
 	return (
 		<div className="site-canvas min-h-screen">
 			<script
diff --git a/app/not-found.jsx b/app/[locale]/not-found.jsx
similarity index 100%
rename from app/not-found.jsx
rename to app/[locale]/not-found.jsx
diff --git a/app/page.jsx b/app/[locale]/page.jsx
similarity index 71%
rename from app/page.jsx
rename to app/[locale]/page.jsx
index bf376fb..1fbb4a1 100644
--- a/app/page.jsx
+++ b/app/[locale]/page.jsx
@@ -5,6 +5,7 @@ import Link from "next/link";
 import seriesData from "@/public/series.json";
 import frameworksData from "@/public/frameworks.json";
 import { SITE } from "@/lib/seo";
+import { getLocalizedHref } from "@/components/LanguageSelector";
 import {
 	AlertTriangle,
 	ArrowRight,
@@ -87,7 +88,11 @@ const ERRORS = [
 	},
 ];
 
-export default function Home() {
+export default async function Home({ params }) {
+	const { locale } = await params;
+	const isPt = locale === "pt";
+	const getLinkHref = (href) => getLocalizedHref(`/${locale}${href}`, locale);
+
 	const seriesCount = Object.keys(seriesData).length;
 	const frameworkCount = Object.keys(frameworksData).length;
 	const featured = FEATURED.map((key) => [key, seriesData[key]]).filter(([, serie]) => Boolean(serie));
@@ -113,11 +118,11 @@ export default function Home() {
 						</p>
 
 						<div className="mt-8 flex flex-col items-center justify-center gap-3 sm:flex-row">
-							<Link href="/seletor" className="btn btn-primary w-full sm:w-auto">
+							<Link href={getLinkHref("/seletor")} className="btn btn-primary w-full sm:w-auto">
 								<SlidersHorizontal className="h-4 w-4" aria-hidden="true" />
 								Escolher meu chip
 							</Link>
-							<Link href="/series" className="btn btn-ghost w-full sm:w-auto">
+							<Link href={getLinkHref("/series")} className="btn btn-ghost w-full sm:w-auto">
 								Explorar as {seriesCount} séries
 								<ArrowRight className="h-4 w-4" aria-hidden="true" />
 							</Link>
@@ -127,10 +132,14 @@ export default function Home() {
 							<span><strong className="font-semibold text-ink">{seriesCount}</strong> séries</span>
 							<span aria-hidden="true" className="text-line-strong">·</span>
 							<span><strong className="font-semibold text-ink">{frameworkCount}</strong> frameworks</span>
-							<span aria-hidden="true" className="text-line-strong">·</span>
-							<span><strong className="font-semibold text-ink">78</strong> capítulos no livro</span>
-							<span aria-hidden="true" className="text-line-strong">·</span>
-							<span>100% em português</span>
+							{isPt && (
+								<>
+									<span aria-hidden="true" className="text-line-strong">·</span>
+									<span><strong className="font-semibold text-ink">78</strong> capítulos no livro</span>
+									<span aria-hidden="true" className="text-line-strong">·</span>
+									<span>100% em português</span>
+								</>
+							)}
 						</p>
 					</div>
 
@@ -176,72 +185,74 @@ export default function Home() {
 					</div>
 				</section>
 
-				<section className="shell section pt-8 sm:pt-12" aria-labelledby="livro-titulo">
-					<div className="relative isolate overflow-hidden rounded-[2rem] bg-[#0b0d10] ring-1 ring-white/10 dark:bg-[#05070a] dark:ring-white/15 sm:rounded-[2.5rem]">
-						<div
-							className="pointer-events-none absolute -left-24 top-1/2 -z-10 h-80 w-80 -translate-y-1/2 rounded-full bg-[#2dd4bf]/15 blur-3xl"
-							aria-hidden="true"
-						/>
-						<div className="grid lg:grid-cols-[0.82fr_1.18fr]">
-							<div className="order-1 flex flex-col justify-center p-7 sm:p-10 lg:order-2 lg:p-14">
-								<span className="inline-flex w-fit items-center gap-2 rounded-full border border-white/15 bg-white/5 px-3 py-1 text-xs font-semibold text-[#75cdc1]">
-									<BookOpen className="h-3.5 w-3.5" aria-hidden="true" />
-									Livro novo
-								</span>
-								<h2 id="livro-titulo" className="mt-5 font-display text-[clamp(2rem,4.2vw,3.2rem)] font-semibold leading-[1.05] tracking-[-0.04em] text-[#f4f6f8]">
-									{SITE.livroTitulo}
-								</h2>
-								<p className="mt-2 text-base text-[#a6afbd]">{SITE.livroSubtitulo}</p>
-								<p className="mt-5 max-w-xl text-sm leading-relaxed text-[#c4cbd5]">
-									Um percurso completo pelo hardware e pelo firmware do ESP32: da arquitetura do chip
-									à implantação de produtos conectados. São 12 partes e 78 capítulos sobre Arduino,
-									ESP-IDF, FreeRTOS, Wi-Fi, BLE, Thread e Matter, periféricos, depuração, baixo consumo
-									e segurança.
-								</p>
+				{isPt && (
+					<section className="shell section pt-8 sm:pt-12" aria-labelledby="livro-titulo">
+						<div className="relative isolate overflow-hidden rounded-[2rem] bg-[#0b0d10] ring-1 ring-white/10 dark:bg-[#05070a] dark:ring-white/15 sm:rounded-[2.5rem]">
+							<div
+								className="pointer-events-none absolute -left-24 top-1/2 -z-10 h-80 w-80 -translate-y-1/2 rounded-full bg-[#2dd4bf]/15 blur-3xl"
+								aria-hidden="true"
+							/>
+							<div className="grid lg:grid-cols-[0.82fr_1.18fr]">
+								<div className="order-1 flex flex-col justify-center p-7 sm:p-10 lg:order-2 lg:p-14">
+									<span className="inline-flex w-fit items-center gap-2 rounded-full border border-white/15 bg-white/5 px-3 py-1 text-xs font-semibold text-[#75cdc1]">
+										<BookOpen className="h-3.5 w-3.5" aria-hidden="true" />
+										Livro novo
+									</span>
+									<h2 id="livro-titulo" className="mt-5 font-display text-[clamp(2rem,4.2vw,3.2rem)] font-semibold leading-[1.05] tracking-[-0.04em] text-[#f4f6f8]">
+										{SITE.livroTitulo}
+									</h2>
+									<p className="mt-2 text-base text-[#a6afbd]">{SITE.livroSubtitulo}</p>
+									<p className="mt-5 max-w-xl text-sm leading-relaxed text-[#c4cbd5]">
+										Um percurso completo pelo hardware e pelo firmware do ESP32: da arquitetura do chip
+										à implantação de produtos conectados. São 12 partes e 78 capítulos sobre Arduino,
+										ESP-IDF, FreeRTOS, Wi-Fi, BLE, Thread e Matter, periféricos, depuração, baixo consumo
+										e segurança.
+									</p>
 
-								<p className="mt-6 flex flex-wrap items-center gap-x-3 gap-y-1.5 text-xs text-[#a6afbd]">
-									<span>12 partes</span>
-									<span aria-hidden="true" className="text-white/20">·</span>
-									<span>78 capítulos</span>
-									<span aria-hidden="true" className="text-white/20">·</span>
-									<span>ISBN {SITE.livroIsbn}</span>
-								</p>
+									<p className="mt-6 flex flex-wrap items-center gap-x-3 gap-y-1.5 text-xs text-[#a6afbd]">
+										<span>12 partes</span>
+										<span aria-hidden="true" className="text-white/20">·</span>
+										<span>78 capítulos</span>
+										<span aria-hidden="true" className="text-white/20">·</span>
+										<span>ISBN {SITE.livroIsbn}</span>
+									</p>
 
-								<div className="mt-7 flex flex-col gap-3 sm:flex-row sm:flex-wrap sm:items-center">
-									<a
-										href={SITE.livroAmazon}
-										target="_blank"
-										rel="noopener noreferrer"
-										className="inline-flex min-h-11 items-center justify-center gap-2 rounded-full bg-[#2dd4bf] px-5 text-sm font-semibold text-[#06201d] transition-colors duration-300 hover:bg-[#5eead4]"
-									>
-										Comprar digital
-										<ArrowUpRight className="h-4 w-4" aria-hidden="true" />
-									</a>
-									<a
-										href={SITE.livroUiclap}
-										target="_blank"
-										rel="noopener noreferrer"
-										className="inline-flex min-h-11 items-center justify-center gap-2 rounded-full border border-white/20 px-5 text-sm font-semibold text-[#f4f6f8] transition-colors duration-300 hover:border-white/40 hover:bg-white/5"
-									>
-										Comprar impresso
-										<ArrowUpRight className="h-4 w-4" aria-hidden="true" />
-									</a>
-									<Link href="/livro" className="inline-flex min-h-11 items-center justify-center gap-1.5 rounded-full px-3 text-sm font-medium text-[#a6afbd] transition-colors duration-300 hover:text-[#f4f6f8]">
-										Ficha completa
-										<ArrowRight className="h-4 w-4" aria-hidden="true" />
-									</Link>
+									<div className="mt-7 flex flex-col gap-3 sm:flex-row sm:flex-wrap sm:items-center">
+										<a
+											href={SITE.livroAmazon}
+											target="_blank"
+											rel="noopener noreferrer"
+											className="inline-flex min-h-11 items-center justify-center gap-2 rounded-full bg-[#2dd4bf] px-5 text-sm font-semibold text-[#06201d] transition-colors duration-300 hover:bg-[#5eead4]"
+										>
+											Comprar digital
+											<ArrowUpRight className="h-4 w-4" aria-hidden="true" />
+										</a>
+										<a
+											href={SITE.livroUiclap}
+											target="_blank"
+											rel="noopener noreferrer"
+											className="inline-flex min-h-11 items-center justify-center gap-2 rounded-full border border-white/20 px-5 text-sm font-semibold text-[#f4f6f8] transition-colors duration-300 hover:border-white/40 hover:bg-white/5"
+										>
+											Comprar impresso
+											<ArrowUpRight className="h-4 w-4" aria-hidden="true" />
+										</a>
+										<Link href="/pt/livro" className="inline-flex min-h-11 items-center justify-center gap-1.5 rounded-full px-3 text-sm font-medium text-[#a6afbd] transition-colors duration-300 hover:text-[#f4f6f8]">
+											Ficha completa
+											<ArrowRight className="h-4 w-4" aria-hidden="true" />
+										</Link>
+									</div>
 								</div>
-							</div>
 
-							<div className="order-2 flex items-center justify-center border-t border-white/10 p-8 sm:p-12 lg:order-1 lg:border-r lg:border-t-0 lg:p-14">
-								<div className="relative w-[min(15.5rem,68%)] lg:w-[min(17rem,100%)]">
-									<div className="absolute -inset-10 -z-10 rounded-full bg-[#2dd4bf]/10 blur-3xl" aria-hidden="true" />
-									<BookCover />
+								<div className="order-2 flex items-center justify-center border-t border-white/10 p-8 sm:p-12 lg:order-1 lg:border-r lg:border-t-0 lg:p-14">
+									<div className="relative w-[min(15.5rem,68%)] lg:w-[min(17rem,100%)]">
+										<div className="absolute -inset-10 -z-10 rounded-full bg-[#2dd4bf]/10 blur-3xl" aria-hidden="true" />
+										<BookCover />
+									</div>
 								</div>
 							</div>
 						</div>
-					</div>
-				</section>
+					</section>
+				)}
 
 				<section className="shell section" aria-labelledby="ferramentas-titulo">
 					<div className="mx-auto max-w-2xl text-center">
diff --git a/app/seletor/layout.jsx b/app/[locale]/seletor/layout.jsx
similarity index 100%
rename from app/seletor/layout.jsx
rename to app/[locale]/seletor/layout.jsx
diff --git a/app/seletor/page.jsx b/app/[locale]/seletor/page.jsx
similarity index 100%
rename from app/seletor/page.jsx
rename to app/[locale]/seletor/page.jsx
diff --git a/app/series/[key]/page.jsx b/app/[locale]/series/[key]/page.jsx
similarity index 100%
rename from app/series/[key]/page.jsx
rename to app/[locale]/series/[key]/page.jsx
diff --git a/app/series/layout.jsx b/app/[locale]/series/layout.jsx
similarity index 100%
rename from app/series/layout.jsx
rename to app/[locale]/series/layout.jsx
diff --git a/app/series/page.jsx b/app/[locale]/series/page.jsx
similarity index 100%
rename from app/series/page.jsx
rename to app/[locale]/series/page.jsx
diff --git a/app/sobre/page.jsx b/app/[locale]/sobre/page.jsx
similarity index 100%
rename from app/sobre/page.jsx
rename to app/[locale]/sobre/page.jsx
diff --git a/app/globals.css b/app/globals.css
index 3584787..a79106d 100644
--- a/app/globals.css
+++ b/app/globals.css
@@ -759,4 +759,28 @@
 	.no-scrollbar::-webkit-scrollbar {
 		display: none;
 	}
+
+	/* ------------------------------------------------------------------------
+	   Tipografia e layout internacionalizados (seção 9b da spec)
+	   ------------------------------------------------------------------------ */
+	html[lang="zh-CN"] {
+		font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Noto Sans SC", sans-serif;
+		letter-spacing: 0;
+		line-height: 1.7;
+	}
+
+	html[lang="zh-CN"] code,
+	html[lang="zh-CN"] pre,
+	html[lang="zh-CN"] kbd {
+		font-family: var(--font-mono);
+	}
+
+	html[lang="de"],
+	html[lang="fr"] {
+		hyphens: auto;
+	}
+
+	p, li, dd {
+		overflow-wrap: anywhere;
+	}
 }
diff --git a/app/layout.jsx b/app/layout.jsx
deleted file mode 100644
index 879cb9d..0000000
--- a/app/layout.jsx
+++ /dev/null
@@ -1,134 +0,0 @@
-import { JetBrains_Mono, Manrope, Space_Grotesk } from "next/font/google";
-import "./globals.css";
-import Providers from "@/components/Providers";
-import { SITE, jsonLd } from "@/lib/seo";
-
-const spaceGrotesk = Space_Grotesk({
-	subsets: ["latin"],
-	variable: "--font-space-grotesk",
-	display: "swap",
-	weight: ["500", "600", "700"],
-});
-
-const manrope = Manrope({
-	subsets: ["latin"],
-	variable: "--font-manrope",
-	display: "swap",
-	weight: ["400", "500", "600", "700"],
-});
-
-const jetbrainsMono = JetBrains_Mono({
-	subsets: ["latin"],
-	variable: "--font-jetbrains",
-	display: "swap",
-	weight: ["400", "500", "600"],
-});
-
-export const metadata = {
-	// metadataBase é o que transforma caminhos relativos em URLs absolutas nas
-	// tags canonical e og:image. Sem ele, o Google recebe og:image quebrado.
-	metadataBase: new URL(SITE.url),
-
-	title: {
-		default: "ESPDocs · Documentação do ESP32 em português",
-		// Cada página fornece só o próprio nome; o sufixo entra automaticamente.
-		template: "%s · ESPDocs",
-	},
-	description:
-		"Especificações, pinagem, comparação e seleção das 12 séries de microcontroladores ESP32, em português brasileiro. Datasheets, periféricos, segurança em hardware e diagramas de conexão.",
-
-	applicationName: "ESPDocs",
-	authors: [{ name: "Lucas Rayan Guerra", url: "https://lucasrguerra.dev.br" }],
-	creator: "Lucas Rayan Guerra",
-	publisher: "Ciência Embarcada",
-	category: "technology",
-
-	keywords: [
-		"ESP32", "ESP32 português", "documentação ESP32", "pinout ESP32",
-		"ESP32-S3", "ESP32-C3", "ESP32-C6", "ESP32-P4", "ESP32-H2",
-		"comparar ESP32", "qual ESP32 escolher", "datasheet ESP32",
-		"microcontrolador", "Espressif", "ESP-IDF", "IoT", "sistemas embarcados",
-	],
-
-	alternates: { canonical: "/" },
-
-	openGraph: {
-		type: "website",
-		locale: "pt_BR",
-		url: SITE.url,
-		siteName: "ESPDocs",
-		title: "ESPDocs · Documentação do ESP32 em português",
-		description:
-			"Especificações, pinagem, comparação e seleção das 12 séries de microcontroladores ESP32, em português brasileiro.",
-	},
-
-	twitter: {
-		card: "summary_large_image",
-		title: "ESPDocs · Documentação do ESP32 em português",
-		description:
-			"Especificações, pinagem, comparação e seleção das 12 séries de ESP32, em português.",
-	},
-
-	robots: {
-		index: true,
-		follow: true,
-		googleBot: {
-			index: true,
-			follow: true,
-			"max-image-preview": "large",
-			"max-snippet": -1,
-			"max-video-preview": -1,
-		},
-	},
-
-	icons: {
-		icon: [
-			{ url: "/favicon.ico", sizes: "48x48", type: "image/x-icon" },
-			{ url: "/favicon-48x48.png", sizes: "48x48", type: "image/png" },
-			{ url: "/favicon-32x32.png", sizes: "32x32", type: "image/png" },
-			{ url: "/favicon-16x16.png", sizes: "16x16", type: "image/png" },
-			{ url: "/icon-192.png", sizes: "192x192", type: "image/png" },
-			{ url: "/icon-512.png", sizes: "512x512", type: "image/png" },
-			{ url: "/icon.svg", type: "image/svg+xml" },
-		],
-		apple: [
-			{ url: "/apple-touch-icon.png", sizes: "180x180", type: "image/png" },
-		],
-		shortcut: "/favicon.ico",
-	},
-	manifest: "/site.webmanifest",
-	formatDetection: { telephone: false, address: false, email: false },
-};
-
-export const viewport = {
-	themeColor: [
-		{ media: "(prefers-color-scheme: light)", color: "#f5f6f8" },
-		{ media: "(prefers-color-scheme: dark)", color: "#07090d" },
-	],
-};
-
-export default function RootLayout({ children }) {
-	return (
-		<html lang="pt-BR" className={`${spaceGrotesk.variable} ${manrope.variable} ${jetbrainsMono.variable}`} suppressHydrationWarning>
-			<head>
-				{/* Dados estruturados do site e da organização. É o que permite ao
-				    Google montar o box de busca interna e entender a autoria. */}
-				<script
-					type="application/ld+json"
-					dangerouslySetInnerHTML={{ __html: JSON.stringify(jsonLd.siteESociedade()) }}
-				/>
-			</head>
-			<body className="font-sans antialiased bg-canvas text-ink overflow-x-clip" suppressHydrationWarning>
-				<a
-					href="#conteudo"
-					className="sr-only focus:not-sr-only focus:fixed focus:left-4 focus:top-4 focus:z-[200] focus:rounded-full focus:bg-ink focus:px-5 focus:py-3 focus:text-sm focus:font-semibold focus:text-canvas"
-				>
-					Pular para o conteúdo
-				</a>
-				<Providers>
-					{children}
-				</Providers>
-			</body>
-		</html>
-	);
-}
diff --git a/components/Footer.jsx b/components/Footer.jsx
index 00d7125..821c88d 100644
--- a/components/Footer.jsx
+++ b/components/Footer.jsx
@@ -1,17 +1,21 @@
+"use client";
+
 import Link from "next/link";
+import { usePathname } from "next/navigation";
 import Logo from "@/components/Logo";
 import GiteaMark from "@/components/GiteaMark";
 import { ArrowUpRight } from "lucide-react";
 import { SITE } from "@/lib/seo";
+import { LOCALES, getLocalizedHref } from "@/components/LanguageSelector";
 
-const COLUMNS = [
+const BASE_COLUMNS = [
 	{
 		title: "Explorar",
 		links: [
 			{ href: "/series", label: "Séries ESP32" },
 			{ href: "/comparacao", label: "Comparador" },
 			{ href: "/catalogo", label: "Catálogo de placas" },
-			{ href: "/livro", label: "O livro" },
+			{ href: "/livro", label: "O livro", livroOnly: true },
 		],
 	},
 	{
@@ -35,14 +39,26 @@ const COLUMNS = [
 ];
 
 export default function Footer() {
+	const pathname = usePathname() || "";
 	const year = new Date().getFullYear();
 
+	const currentLocale =
+		LOCALES.find((l) => pathname === `/${l.code}` || pathname.startsWith(`/${l.code}/`))?.code || "pt";
+	const isPt = currentLocale === "pt";
+
+	const getLinkHref = (href) => getLocalizedHref(`/${currentLocale}${href}`, currentLocale);
+
+	const columns = BASE_COLUMNS.map((col) => ({
+		...col,
+		links: col.links.filter((l) => !l.livroOnly || isPt),
+	}));
+
 	return (
 		<footer className="mt-20 border-t border-line md:mt-28" aria-label="Rodapé do ESPDocs">
 			<div className="shell py-14 md:py-20">
 				<div className="grid gap-12 lg:grid-cols-[1.1fr_2fr]">
 					<div>
-						<Link href="/" className="inline-flex min-h-11 items-center gap-2.5" aria-label="ESPDocs, página inicial">
+						<Link href={getLinkHref("/")} className="inline-flex min-h-11 items-center gap-2.5" aria-label="ESPDocs, página inicial">
 							<Logo className="h-7 w-7" />
 							<span className="font-display text-2xl font-semibold tracking-[-0.045em] text-ink">ESPDocs</span>
 						</Link>
@@ -51,41 +67,45 @@ export default function Footer() {
 							Dados públicos, curadoria editorial e links para as fontes oficiais.
 						</p>
 
-						<Link
-							href="/livro"
-							className="group mt-7 grid grid-cols-[3rem_1fr_auto] items-center gap-3.5 rounded-2xl border border-line bg-surface p-3.5 transition-colors duration-300 hover:border-line-strong"
-						>
-							{/* eslint-disable-next-line @next/next/no-img-element */}
-							<img
-								src={SITE.livroCapa}
-								alt=""
-								aria-hidden="true"
-								width={48}
-								height={72}
-								className="h-[72px] w-12 rounded-md object-cover shadow-md"
-							/>
-							<span className="min-w-0">
-								<span className="text-xs font-semibold text-accent">Livro novo</span>
-								<span className="mt-0.5 block font-display text-base font-semibold leading-tight text-ink">Microcontroladores ESP32</span>
-								<span className="mt-1 block text-xs text-muted">Conectividade, eficiência e desempenho</span>
-							</span>
-							<ArrowUpRight className="h-4 w-4 text-faint transition-transform duration-300 group-hover:-translate-y-0.5 group-hover:translate-x-0.5 group-hover:text-accent" aria-hidden="true" />
-						</Link>
+						{isPt && (
+							<>
+								<Link
+									href="/pt/livro"
+									className="group mt-7 grid grid-cols-[3rem_1fr_auto] items-center gap-3.5 rounded-2xl border border-line bg-surface p-3.5 transition-colors duration-300 hover:border-line-strong"
+								>
+									{/* eslint-disable-next-line @next/next/no-img-element */}
+									<img
+										src={SITE.livroCapa}
+										alt=""
+										aria-hidden="true"
+										width={48}
+										height={72}
+										className="h-[72px] w-12 rounded-md object-cover shadow-md"
+									/>
+									<span className="min-w-0">
+										<span className="text-xs font-semibold text-accent">Livro novo</span>
+										<span className="mt-0.5 block font-display text-base font-semibold leading-tight text-ink">Microcontroladores ESP32</span>
+										<span className="mt-1 block text-xs text-muted">Conectividade, eficiência e desempenho</span>
+									</span>
+									<ArrowUpRight className="h-4 w-4 text-faint transition-transform duration-300 group-hover:-translate-y-0.5 group-hover:translate-x-0.5 group-hover:text-accent" aria-hidden="true" />
+								</Link>
 
-						<div className="mt-4 flex flex-wrap gap-x-5 gap-y-2 text-sm">
-							<a href={SITE.livroAmazon} target="_blank" rel="noopener noreferrer" className="inline-flex min-h-11 items-center gap-1 text-muted transition-colors hover:text-accent">
-								Amazon
-								<ArrowUpRight className="h-3.5 w-3.5" aria-hidden="true" />
-							</a>
-							<a href={SITE.livroUiclap} target="_blank" rel="noopener noreferrer" className="inline-flex min-h-11 items-center gap-1 text-muted transition-colors hover:text-accent">
-								UICLAP
-								<ArrowUpRight className="h-3.5 w-3.5" aria-hidden="true" />
-							</a>
-						</div>
+								<div className="mt-4 flex flex-wrap gap-x-5 gap-y-2 text-sm">
+									<a href={SITE.livroAmazon} target="_blank" rel="noopener noreferrer" className="inline-flex min-h-11 items-center gap-1 text-muted transition-colors hover:text-accent">
+										Amazon
+										<ArrowUpRight className="h-3.5 w-3.5" aria-hidden="true" />
+									</a>
+									<a href={SITE.livroUiclap} target="_blank" rel="noopener noreferrer" className="inline-flex min-h-11 items-center gap-1 text-muted transition-colors hover:text-accent">
+										UICLAP
+										<ArrowUpRight className="h-3.5 w-3.5" aria-hidden="true" />
+									</a>
+								</div>
+							</>
+						)}
 					</div>
 
 					<div className="grid grid-cols-2 gap-8 sm:grid-cols-4">
-						{COLUMNS.map((column) => (
+						{columns.map((column) => (
 							<nav key={column.title} aria-label={column.title}>
 								<h2 className="text-sm font-semibold text-ink">{column.title}</h2>
 								<ul className="mt-2 space-y-0">
@@ -102,7 +122,7 @@ export default function Footer() {
 													<ArrowUpRight className="h-3 w-3" aria-hidden="true" />
 												</a>
 											) : (
-												<Link href={link.href} className="inline-flex min-h-11 min-w-11 items-center text-sm text-muted transition-colors hover:text-accent">
+												<Link href={getLinkHref(link.href)} className="inline-flex min-h-11 min-w-11 items-center text-sm text-muted transition-colors hover:text-accent">
 													{link.label}
 												</Link>
 											)}
@@ -119,45 +139,40 @@ export default function Footer() {
 								<br />
 								<span className="text-xs text-faint">Ciência Embarcada</span>
 							</p>
-							<div className="mt-4 flex items-center gap-2">
-								<a
-									href={SITE.repositorio}
-									target="_blank"
-									rel="noopener noreferrer"
-									aria-label="Gitea do projeto (abre em nova aba)"
-									className="grid h-11 w-11 place-items-center rounded-full border border-line text-ink transition-colors hover:border-line-strong hover:bg-surface"
-								>
-									<GiteaMark className="h-4 w-4" />
+							<div className="mt-2 flex flex-wrap gap-x-4 gap-y-1 text-sm">
+								<a href={SITE.autorUrl} target="_blank" rel="noopener noreferrer" className="inline-flex min-h-11 items-center text-muted transition-colors hover:text-accent">
+									Site pessoal
 								</a>
-								<a
-									href={SITE.autorLinkedin}
-									target="_blank"
-									rel="noopener noreferrer"
-									aria-label="LinkedIn do autor (abre em nova aba)"
-									className="grid h-11 w-11 place-items-center rounded-full border border-line text-ink transition-colors hover:border-line-strong hover:bg-surface"
-								>
-									<svg className="h-4 w-4" viewBox="0 0 24 24" fill="currentColor" aria-hidden="true">
-										<path d="M4.98 3.5a2.5 2.5 0 1 1 0 5.001 2.5 2.5 0 0 1 0-5zM3 8.98h4v12H3v-12zm6.5 0h3.8v1.6h.1c.5-.9 1.8-1.9 3.6-1.9 3.8 0 4.5 2.5 4.5 5.8v6.5h-4v-5.8c0-1.4-.1-3.2-2-3.2-2 0-2.3 1.6-2.3 3.1v5.9h-4v-12z" />
-									</svg>
+								<a href={SITE.autorLinkedin} target="_blank" rel="noopener noreferrer" className="inline-flex min-h-11 items-center text-muted transition-colors hover:text-accent">
+									LinkedIn
 								</a>
 							</div>
 						</div>
 					</div>
 				</div>
 
-				<div className="mt-14 flex flex-col gap-4 border-t border-line pt-6 text-xs leading-relaxed text-faint md:flex-row md:items-center md:justify-between">
-					<p>© {year} ESPDocs. Projeto independente, sem afiliação com a Espressif Systems.</p>
-					<p className="flex flex-wrap items-center gap-x-5 gap-y-2">
-						<a href={SITE.blog} target="_blank" rel="noopener noreferrer" className="inline-flex min-h-11 items-center gap-1 transition-colors hover:text-accent">
+				<div className="mt-12 flex flex-col items-center justify-between gap-4 border-t border-line pt-8 text-xs text-muted sm:flex-row">
+					<p>© {year} ESPDocs · Conteúdo sob licença MIT. Feito para a comunidade de sistemas embarcados.</p>
+					<div className="flex items-center gap-6">
+						<a
+							href={SITE.repositorio}
+							target="_blank"
+							rel="noopener noreferrer"
+							className="inline-flex min-h-11 items-center gap-1.5 transition-colors hover:text-accent"
+						>
+							<GiteaMark className="h-4 w-4" aria-hidden="true" />
+							<span>Gitea</span>
+						</a>
+						<span>·</span>
+						<a
+							href={SITE.blog}
+							target="_blank"
+							rel="noopener noreferrer"
+							className="inline-flex min-h-11 items-center transition-colors hover:text-accent"
+						>
 							Ciência Embarcada
-							<ArrowUpRight className="h-3 w-3" aria-hidden="true" />
 						</a>
-						<a href={SITE.autorUrl} target="_blank" rel="noopener noreferrer" className="inline-flex min-h-11 items-center gap-1 transition-colors hover:text-accent">
-							lucasrguerra.dev.br
-							<ArrowUpRight className="h-3 w-3" aria-hidden="true" />
-						</a>
-						<span>Fontes oficiais: Espressif Systems.</span>
-					</p>
+					</div>
 				</div>
 			</div>
 		</footer>
diff --git a/components/Header.jsx b/components/Header.jsx
index 67c72ff..309fa63 100644
--- a/components/Header.jsx
+++ b/components/Header.jsx
@@ -5,6 +5,7 @@ import { createPortal } from "react-dom";
 import Link from "next/link";
 import Logo from "@/components/Logo";
 import SearchDialog from "@/components/SearchDialog";
+import LanguageSelector, { LOCALES, getLocalizedHref } from "@/components/LanguageSelector";
 import { usePathname } from "next/navigation";
 import { useTheme } from "next-themes";
 import {
@@ -69,12 +70,16 @@ const MOBILE_LINKS = [
 	{ href: "/sobre", label: "Sobre" },
 ];
 
-function isActivePath(pathname, href) {
-	return href === "/" ? pathname === "/" : pathname === href || String(pathname).startsWith(`${href}/`);
+function isActivePath(pathname, href, currentLocale) {
+	const localized = getLocalizedHref(`/${currentLocale}${href}`, currentLocale);
+	if (href === "/" || localized === `/${currentLocale}/` || localized === `/${currentLocale}`) {
+		return pathname === `/${currentLocale}` || pathname === `/${currentLocale}/`;
+	}
+	return pathname === localized || String(pathname).startsWith(`${localized}/`);
 }
 
 export default function Header() {
-	const pathname = usePathname();
+	const pathname = usePathname() || "";
 	const [mounted, setMounted] = useState(false);
 	const [openMenu, setOpenMenu] = useState(null);
 	const [drawerOpen, setDrawerOpen] = useState(false);
@@ -82,6 +87,12 @@ export default function Header() {
 	const closeRef = useRef(null);
 	const menuButtonRef = useRef(null);
 
+	const currentLocale =
+		LOCALES.find((l) => pathname === `/${l.code}` || pathname.startsWith(`/${l.code}/`))?.code || "pt";
+	const isPt = currentLocale === "pt";
+
+	const getLinkHref = (href) => getLocalizedHref(`/${currentLocale}${href}`, currentLocale);
+
 	useEffect(() => setMounted(true), []);
 
 	useEffect(() => {
@@ -118,18 +129,20 @@ export default function Header() {
 		};
 	}, [drawerOpen]);
 
+	const visibleMobileLinks = isPt ? MOBILE_LINKS : MOBILE_LINKS.filter((l) => l.href !== "/livro");
+
 	return (
 		<header className="sticky top-0 z-50 pt-3 sm:pt-4">
 			<div className="shell">
 				<div className="nav-pill flex h-16 items-center justify-between gap-3 rounded-full px-3 sm:px-4">
-					<Link href="/" className="flex min-h-11 shrink-0 items-center gap-2.5 rounded-full pl-1 pr-2" aria-label="ESPDocs, página inicial">
+					<Link href={getLinkHref("/")} className="flex min-h-11 shrink-0 items-center gap-2.5 rounded-full pl-1 pr-2" aria-label="ESPDocs, página inicial">
 						<Logo className="h-[30px] w-[30px]" />
 						<span className="font-display text-[1.3rem] font-semibold leading-none tracking-[-0.045em] text-ink">ESPDocs</span>
 					</Link>
 
 					<nav ref={navRef} className="hidden items-center gap-0.5 lg:flex" aria-label="Navegação principal">
 						{MENUS.map((menu) => {
-							const active = menu.items.some((item) => isActivePath(pathname, item.href));
+							const active = menu.items.some((item) => isActivePath(pathname, item.href, currentLocale));
 							const expanded = openMenu === menu.id;
 							return (
 								<div key={menu.id} className="relative">
@@ -150,12 +163,13 @@ export default function Header() {
 										>
 											{menu.items.map((item) => {
 												const Icon = item.icon;
+												const localizedHref = getLinkHref(item.href);
 												return (
 													<Link
 														key={item.href}
-														href={item.href}
+														href={localizedHref}
 														className="group flex items-start gap-3 rounded-2xl px-3 py-3 transition-colors hover:bg-surface-2"
-														aria-current={isActivePath(pathname, item.href) ? "page" : undefined}
+														aria-current={isActivePath(pathname, item.href, currentLocale) ? "page" : undefined}
 													>
 														<span className="mt-0.5 grid h-9 w-9 shrink-0 place-items-center rounded-xl bg-accent-soft text-accent transition-colors group-hover:bg-surface">
 															<Icon className="h-4 w-4" aria-hidden="true" />
@@ -173,20 +187,23 @@ export default function Header() {
 							);
 						})}
 
-						<Link href="/livro" className={`nav-link ${isActivePath(pathname, "/livro") ? "is-active" : ""}`} aria-current={isActivePath(pathname, "/livro") ? "page" : undefined}>
-							Livro
-						</Link>
-						<Link href="/sobre" className={`nav-link ${isActivePath(pathname, "/sobre") ? "is-active" : ""}`} aria-current={isActivePath(pathname, "/sobre") ? "page" : undefined}>
+						{isPt && (
+							<Link href={getLinkHref("/livro")} className={`nav-link ${isActivePath(pathname, "/livro", currentLocale) ? "is-active" : ""}`} aria-current={isActivePath(pathname, "/livro", currentLocale) ? "page" : undefined}>
+								Livro
+							</Link>
+						)}
+						<Link href={getLinkHref("/sobre")} className={`nav-link ${isActivePath(pathname, "/sobre", currentLocale) ? "is-active" : ""}`} aria-current={isActivePath(pathname, "/sobre", currentLocale) ? "page" : undefined}>
 							Sobre
 						</Link>
 					</nav>
 
 					<div className="flex items-center gap-1.5">
-						<Link href="/seletor" className="btn btn-primary btn-sm hidden lg:inline-flex">
+						<Link href={getLinkHref("/seletor")} className="btn btn-primary btn-sm hidden lg:inline-flex">
 							<SlidersHorizontal className="h-4 w-4" aria-hidden="true" />
 							Selecionar chip
 						</Link>
 						<SearchDialog />
+						<LanguageSelector />
 						<ThemeToggle />
 						<button
 							ref={menuButtonRef}
@@ -238,38 +255,40 @@ export default function Header() {
 								</button>
 							</div>
 
-							<div className="px-4 pb-2">
-								<Link
-									href="/livro"
-									onClick={() => setDrawerOpen(false)}
-									className="group grid grid-cols-[3.25rem_1fr_auto] items-center gap-3 rounded-2xl bg-[#0b0d10] p-3 text-[#f4f6f8] ring-1 ring-white/10"
-								>
-									{/* eslint-disable-next-line @next/next/no-img-element */}
-									<img
-										src="/livro/capa.jpg"
-										alt=""
-										aria-hidden="true"
-										width={52}
-										height={78}
-										className="h-[78px] w-[52px] rounded-md object-cover shadow-lg"
-									/>
-									<span className="min-w-0">
-										<span className="text-[0.6875rem] font-semibold text-[#75cdc1]">Livro novo</span>
-										<span className="mt-1 block font-display text-lg font-semibold leading-tight">Microcontroladores ESP32</span>
-										<span className="mt-1 block text-xs text-[#a6afbd]">Conectividade, eficiência e desempenho</span>
-									</span>
-									<ArrowRight className="h-4 w-4 shrink-0 text-[#75cdc1] transition-transform duration-300 group-hover:translate-x-1" aria-hidden="true" />
-								</Link>
-							</div>
+							{isPt && (
+								<div className="px-4 pb-2">
+									<Link
+										href="/pt/livro"
+										onClick={() => setDrawerOpen(false)}
+										className="group grid grid-cols-[3.25rem_1fr_auto] items-center gap-3 rounded-2xl bg-[#0b0d10] p-3 text-[#f4f6f8] ring-1 ring-white/10"
+									>
+										{/* eslint-disable-next-line @next/next/no-img-element */}
+										<img
+											src="/livro/capa.jpg"
+											alt=""
+											aria-hidden="true"
+											width={52}
+											height={78}
+											className="h-[78px] w-[52px] rounded-md object-cover shadow-lg"
+										/>
+										<span className="min-w-0">
+											<span className="text-[0.6875rem] font-semibold text-[#75cdc1]">Livro novo</span>
+											<span className="mt-1 block font-display text-lg font-semibold leading-tight">Microcontroladores ESP32</span>
+											<span className="mt-1 block text-xs text-[#a6afbd]">Conectividade, eficiência e desempenho</span>
+										</span>
+										<ArrowRight className="h-4 w-4 shrink-0 text-[#75cdc1] transition-transform duration-300 group-hover:translate-x-1" aria-hidden="true" />
+									</Link>
+								</div>
+							)}
 
 							<nav className="flex-1 overflow-y-auto px-3 py-2" aria-label="Navegação móvel">
-								{MOBILE_LINKS.map((link) => (
+								{visibleMobileLinks.map((link) => (
 									<Link
 										key={link.href}
-										href={link.href}
+										href={getLinkHref(link.href)}
 										onClick={() => setDrawerOpen(false)}
 										className="group flex min-h-11 items-center justify-between gap-3 rounded-xl px-3 text-sm font-medium text-ink-soft transition-colors hover:bg-surface-2 hover:text-ink"
-										aria-current={isActivePath(pathname, link.href) ? "page" : undefined}
+										aria-current={isActivePath(pathname, link.href, currentLocale) ? "page" : undefined}
 									>
 										{link.label}
 										<ArrowRight className="h-4 w-4 text-faint transition-transform duration-300 group-hover:translate-x-0.5 group-hover:text-accent" aria-hidden="true" />
@@ -278,7 +297,7 @@ export default function Header() {
 							</nav>
 
 							<div className="p-4 pt-2">
-								<Link href="/seletor" onClick={() => setDrawerOpen(false)} className="btn btn-primary w-full">
+								<Link href={getLinkHref("/seletor")} onClick={() => setDrawerOpen(false)} className="btn btn-primary w-full">
 									<SlidersHorizontal className="h-4 w-4" aria-hidden="true" />
 									Selecionar meu chip
 								</Link>
diff --git a/components/LanguageSelector.jsx b/components/LanguageSelector.jsx
new file mode 100644
index 0000000..5d43e9a
--- /dev/null
+++ b/components/LanguageSelector.jsx
@@ -0,0 +1,232 @@
+"use client";
+
+import { useEffect, useRef, useState } from "react";
+import { usePathname } from "next/navigation";
+import { ChevronDown, Globe } from "lucide-react";
+
+export const LOCALES = [
+	{ code: "pt", label: "Português", short: "PT", lang: "pt-BR" },
+	{ code: "en", label: "English", short: "EN", lang: "en" },
+	{ code: "es", label: "Español", short: "ES", lang: "es-419" },
+	{ code: "fr", label: "Français", short: "FR", lang: "fr" },
+	{ code: "de", label: "Deutsch", short: "DE", lang: "de" },
+	{ code: "zh-CN", label: "简体中文", short: "中", lang: "zh-CN" },
+];
+
+const CANONICAL_ROUTES = [
+	{
+		id: "series_item",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/(?:series|serien)\/([^/]+)/,
+		getSlug: (loc, key) => (loc === "de" ? `/serien/${key}` : `/series/${key}`),
+	},
+	{
+		id: "frameworks_item",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/frameworks\/([^/]+)/,
+		getSlug: (loc, key) => `/frameworks/${key}`,
+	},
+	{
+		id: "series",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/(?:series|serien)(?:\/|$)/,
+		getSlug: (loc) => (loc === "de" ? "/serien" : "/series"),
+	},
+	{
+		id: "catalogo",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/(?:catalogo|catalog|catalogue|katalog)(?:\/|$)/,
+		getSlug: (loc) => {
+			if (loc === "de") return "/katalog";
+			if (loc === "fr") return "/catalogue";
+			if (loc === "en" || loc === "zh-CN") return "/catalog";
+			return "/catalogo";
+		},
+	},
+	{
+		id: "comparacao",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/(?:comparacao|compare|comparacion|comparaison|vergleich)(?:\/|$)/,
+		getSlug: (loc) => {
+			if (loc === "en" || loc === "zh-CN") return "/compare";
+			if (loc === "es") return "/comparacion";
+			if (loc === "fr") return "/comparaison";
+			if (loc === "de") return "/vergleich";
+			return "/comparacao";
+		},
+	},
+	{
+		id: "componentes",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/(?:componentes|components|composants|komponenten)(?:\/|$)/,
+		getSlug: (loc) => {
+			if (loc === "en" || loc === "zh-CN") return "/components";
+			if (loc === "fr") return "/composants";
+			if (loc === "de") return "/komponenten";
+			return "/componentes";
+		},
+	},
+	{
+		id: "diagnostico",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/(?:diagnostico|diagnostics|diagnostic|diagnose)(?:\/|$)/,
+		getSlug: (loc) => {
+			if (loc === "en" || loc === "zh-CN") return "/diagnostics";
+			if (loc === "fr") return "/diagnostic";
+			if (loc === "de") return "/diagnose";
+			return "/diagnostico";
+		},
+	},
+	{
+		id: "frameworks",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/frameworks(?:\/|$)/,
+		getSlug: () => "/frameworks",
+	},
+	{
+		id: "glossario",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/(?:glossario|glossary|glosario|glossaire|glossar)(?:\/|$)/,
+		getSlug: (loc) => {
+			if (loc === "en" || loc === "zh-CN") return "/glossary";
+			if (loc === "es") return "/glosario";
+			if (loc === "fr") return "/glossaire";
+			if (loc === "de") return "/glossar";
+			return "/glossario";
+		},
+	},
+	{
+		id: "seletor",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/(?:seletor|selector|selecteur|auswahl)(?:\/|$)/,
+		getSlug: (loc) => {
+			if (loc === "en" || loc === "es" || loc === "zh-CN") return "/selector";
+			if (loc === "fr") return "/selecteur";
+			if (loc === "de") return "/auswahl";
+			return "/seletor";
+		},
+	},
+	{
+		id: "sobre",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/(?:sobre|about|acerca|a-propos|ueber-uns)(?:\/|$)/,
+		getSlug: (loc) => {
+			if (loc === "en" || loc === "zh-CN") return "/about";
+			if (loc === "es") return "/acerca";
+			if (loc === "fr") return "/a-propos";
+			if (loc === "de") return "/ueber-uns";
+			return "/sobre";
+		},
+	},
+	{
+		id: "livro",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/livro(?:\/|$)/,
+		getSlug: (loc) => (loc === "pt" ? "/livro" : ""),
+	},
+];
+
+export function getLocalizedHref(pathname, targetLocale) {
+	if (!pathname || pathname === "/" || pathname === `/${targetLocale}` || pathname === `/${targetLocale}/`) {
+		return `/${targetLocale}/`;
+	}
+
+	for (const route of CANONICAL_ROUTES) {
+		const m = pathname.match(route.match);
+		if (m) {
+			const slug = route.getSlug(targetLocale, m[1]);
+			return slug ? `/${targetLocale}${slug}` : `/${targetLocale}/`;
+		}
+	}
+	return `/${targetLocale}/`;
+}
+
+export default function LanguageSelector() {
+	const pathname = usePathname() || "";
+	const [open, setOpen] = useState(false);
+	const [hash, setHash] = useState("");
+	const containerRef = useRef(null);
+
+	// Detecta locale da URL atual
+	const currentLocaleCode =
+		LOCALES.find((l) => pathname === `/${l.code}` || pathname.startsWith(`/${l.code}/`))?.code || "pt";
+
+	const currentLocale = LOCALES.find((l) => l.code === currentLocaleCode) || LOCALES[0];
+
+	useEffect(() => {
+		if (typeof window !== "undefined") {
+			setHash(window.location.hash || "");
+		}
+	}, [pathname]);
+
+	useEffect(() => {
+		function onPointerDown(e) {
+			if (containerRef.current && !containerRef.current.contains(e.target)) {
+				setOpen(false);
+			}
+		}
+		function onKeyDown(e) {
+			if (e.key === "Escape") {
+				setOpen(false);
+			}
+		}
+		document.addEventListener("mousedown", onPointerDown);
+		document.addEventListener("keydown", onKeyDown);
+		return () => {
+			document.removeEventListener("mousedown", onPointerDown);
+			document.removeEventListener("keydown", onKeyDown);
+		};
+	}, []);
+
+	const handleSelect = (code) => {
+		if (typeof document !== "undefined") {
+			document.cookie = `NEXT_LOCALE=${code}; path=/; max-age=31536000; SameSite=Lax`;
+		}
+		setOpen(false);
+	};
+
+	return (
+		<div ref={containerRef} className="relative">
+			<button
+				type="button"
+				onClick={() => setOpen(!open)}
+				className="flex h-11 min-w-[44px] items-center gap-1.5 rounded-full border border-line bg-surface px-3 text-sm font-semibold text-ink transition-colors hover:bg-surface-2 focus-visible:outline-2 focus-visible:outline-accent"
+				aria-haspopup="listbox"
+				aria-expanded={open}
+				aria-label={`Idioma atual: ${currentLocale.label}. Clique para trocar de idioma.`}
+				title={`Idioma: ${currentLocale.label}`}
+			>
+				<Globe className="h-4 w-4 text-muted" aria-hidden="true" />
+				<span className="font-semibold">{currentLocale.short}</span>
+				<ChevronDown
+					className={`h-3 w-3 text-muted transition-transform duration-200 ${open ? "rotate-180" : ""}`}
+					aria-hidden="true"
+				/>
+			</button>
+
+			{open && (
+				<div
+					role="listbox"
+					aria-label="Idiomas disponíveis"
+					className="absolute right-0 top-full mt-2 w-48 rounded-2xl border border-line bg-surface p-1.5 shadow-[0_24px_60px_-20px_rgba(15,23,42,0.35)] dark:shadow-[0_24px_60px_-20px_rgba(0,0,0,0.8)] z-50"
+				>
+					{LOCALES.map((loc) => {
+						const isActive = loc.code === currentLocaleCode;
+						const href = `${getLocalizedHref(pathname, loc.code)}${hash}`;
+
+						return (
+							<a
+								key={loc.code}
+								href={href}
+								lang={loc.lang}
+								hrefLang={loc.lang}
+								role="option"
+								aria-selected={isActive}
+								aria-current={isActive ? "true" : undefined}
+								onClick={() => handleSelect(loc.code)}
+								className={`flex min-h-[44px] items-center justify-between rounded-xl px-3 py-2 text-sm transition-colors ${
+									isActive
+										? "bg-accent-soft text-accent font-semibold"
+										: "text-ink-soft hover:bg-surface-2 hover:text-ink"
+								}`}
+							>
+								<span>{loc.label}</span>
+								<span className={`text-xs ${isActive ? "text-accent" : "text-muted"}`}>
+									{loc.short}
+								</span>
+							</a>
+						);
+					})}
+				</div>
+			)}
+		</div>
+	);
+}
diff --git a/i18n/navigation.js b/i18n/navigation.js
new file mode 100644
index 0000000..84e08a7
--- /dev/null
+++ b/i18n/navigation.js
@@ -0,0 +1,4 @@
+import { createNavigation } from "next-intl/navigation";
+import { routing } from "./routing";
+
+export const { Link, redirect, usePathname, useRouter, getPathname } = createNavigation(routing);
diff --git a/i18n/request.js b/i18n/request.js
new file mode 100644
index 0000000..9b0e2ad
--- /dev/null
+++ b/i18n/request.js
@@ -0,0 +1,26 @@
+import { getRequestConfig } from "next-intl/server";
+import { hasLocale } from "next-intl";
+import { routing } from "./routing";
+
+export default getRequestConfig(async ({ requestLocale }) => {
+	let locale = await requestLocale;
+	if (!locale || !hasLocale(routing.locales, locale)) {
+		locale = routing.defaultLocale;
+	}
+
+	let messages = {};
+	try {
+		messages = (await import(`../messages/${locale}.json`)).default;
+	} catch {
+		try {
+			messages = (await import("../messages/pt.json")).default;
+		} catch {
+			messages = {};
+		}
+	}
+
+	return {
+		locale,
+		messages,
+	};
+});
diff --git a/i18n/routing.js b/i18n/routing.js
new file mode 100644
index 0000000..5c26bd6
--- /dev/null
+++ b/i18n/routing.js
@@ -0,0 +1,101 @@
+import { defineRouting } from "next-intl/routing";
+
+export const routing = defineRouting({
+	locales: ["pt", "en", "es", "fr", "de", "zh-CN"],
+	defaultLocale: "en",
+	localePrefix: "always",
+	pathnames: {
+		"/": "/",
+		"/series": {
+			pt: "/series",
+			en: "/series",
+			es: "/series",
+			fr: "/series",
+			de: "/serien",
+			"zh-CN": "/series",
+		},
+		"/series/[key]": {
+			pt: "/series/[key]",
+			en: "/series/[key]",
+			es: "/series/[key]",
+			fr: "/series/[key]",
+			de: "/serien/[key]",
+			"zh-CN": "/series/[key]",
+		},
+		"/catalogo": {
+			pt: "/catalogo",
+			en: "/catalog",
+			es: "/catalogo",
+			fr: "/catalogue",
+			de: "/katalog",
+			"zh-CN": "/catalog",
+		},
+		"/comparacao": {
+			pt: "/comparacao",
+			en: "/compare",
+			es: "/comparacion",
+			fr: "/comparaison",
+			de: "/vergleich",
+			"zh-CN": "/compare",
+		},
+		"/componentes": {
+			pt: "/componentes",
+			en: "/components",
+			es: "/componentes",
+			fr: "/composants",
+			de: "/komponenten",
+			"zh-CN": "/components",
+		},
+		"/diagnostico": {
+			pt: "/diagnostico",
+			en: "/diagnostics",
+			es: "/diagnostico",
+			fr: "/diagnostic",
+			de: "/diagnose",
+			"zh-CN": "/diagnostics",
+		},
+		"/frameworks": {
+			pt: "/frameworks",
+			en: "/frameworks",
+			es: "/frameworks",
+			fr: "/frameworks",
+			de: "/frameworks",
+			"zh-CN": "/frameworks",
+		},
+		"/frameworks/[key]": {
+			pt: "/frameworks/[key]",
+			en: "/frameworks/[key]",
+			es: "/frameworks/[key]",
+			fr: "/frameworks/[key]",
+			de: "/frameworks/[key]",
+			"zh-CN": "/frameworks/[key]",
+		},
+		"/glossario": {
+			pt: "/glossario",
+			en: "/glossary",
+			es: "/glosario",
+			fr: "/glossaire",
+			de: "/glossar",
+			"zh-CN": "/glossary",
+		},
+		"/seletor": {
+			pt: "/seletor",
+			en: "/selector",
+			es: "/selector",
+			fr: "/selecteur",
+			de: "/auswahl",
+			"zh-CN": "/selector",
+		},
+		"/sobre": {
+			pt: "/sobre",
+			en: "/about",
+			es: "/acerca",
+			fr: "/a-propos",
+			de: "/ueber-uns",
+			"zh-CN": "/about",
+		},
+		"/livro": {
+			pt: "/livro",
+		},
+	},
+});
diff --git a/messages/pt.json b/messages/pt.json
new file mode 100644
index 0000000..0967ef4
--- /dev/null
+++ b/messages/pt.json
@@ -0,0 +1 @@
+{}
diff --git a/middleware.js b/middleware.js
new file mode 100644
index 0000000..cf26897
--- /dev/null
+++ b/middleware.js
@@ -0,0 +1,102 @@
+import createMiddleware from "next-intl/middleware";
+import { NextResponse } from "next/server";
+import { routing } from "./i18n/routing";
+
+const intlMiddleware = createMiddleware(routing);
+
+const SUPPORTED_LOCALES = routing.locales;
+
+function parseAcceptLanguage(header) {
+	if (!header) return [];
+	return header
+		.split(",")
+		.map((part) => {
+			const [langRange, qPart] = part.trim().split(";");
+			let q = 1.0;
+			if (qPart) {
+				const match = qPart.match(/q=([\d.]+)/);
+				if (match) {
+					const parsed = parseFloat(match[1]);
+					if (!isNaN(parsed)) q = parsed;
+				}
+			}
+			return { lang: langRange.trim().toLowerCase(), q };
+		})
+		.sort((a, b) => b.q - a.q);
+}
+
+function matchLocale(lang) {
+	if (lang.startsWith("pt")) return "pt";
+	if (lang.startsWith("es")) return "es";
+	if (lang.startsWith("fr")) return "fr";
+	if (lang.startsWith("de")) return "de";
+	if (lang.startsWith("zh")) return "zh-CN";
+	if (lang.startsWith("en")) return "en";
+	return null;
+}
+
+function resolveRootLocale(request) {
+	const cookieValue = request.cookies.get("NEXT_LOCALE")?.value;
+	if (cookieValue && SUPPORTED_LOCALES.includes(cookieValue)) {
+		return cookieValue;
+	}
+	const acceptLang = request.headers.get("accept-language");
+	const parsed = parseAcceptLanguage(acceptLang);
+	for (const { lang } of parsed) {
+		const matched = matchLocale(lang);
+		if (matched) return matched;
+	}
+	return "en";
+}
+
+export default function middleware(request) {
+	const { pathname, search } = request.nextUrl;
+
+	// Exclusões de caminhos e arquivos estáticos
+	if (
+		pathname.startsWith("/api") ||
+		pathname.startsWith("/_next") ||
+		pathname === "/robots.txt" ||
+		pathname === "/sitemap.xml" ||
+		pathname === "/google21a790a2c23c0ec5.html" ||
+		/\.[a-zA-Z0-9]+$/.test(pathname)
+	) {
+		return NextResponse.next();
+	}
+
+	// 1. Raiz: negociação de idioma (307)
+	if (pathname === "/") {
+		const targetLocale = resolveRootLocale(request);
+		const url = new URL(`/${targetLocale}/`, request.url);
+		url.search = search;
+		const response = NextResponse.redirect(url, 307);
+		response.headers.set("Vary", "Accept-Language, Cookie");
+		response.headers.set("Cache-Control", "private, no-store");
+		return response;
+	}
+
+	// 2. Livro fora do português: 404
+	if (/^\/(en|es|fr|de|zh-CN)\/livro(\/.*)?$/.test(pathname)) {
+		return new NextResponse(null, { status: 404 });
+	}
+
+	// 3. URLs antigas sem prefixo reconhecido: redirecionamento 308 para /pt/<caminho>
+	const hasLocalePrefix = SUPPORTED_LOCALES.some(
+		(loc) => pathname === `/${loc}` || pathname.startsWith(`/${loc}/`)
+	);
+
+	if (!hasLocalePrefix) {
+		const url = new URL(`/pt${pathname}`, request.url);
+		url.search = search;
+		return NextResponse.redirect(url, 308);
+	}
+
+	// 4. Delegação para o roteamento do next-intl
+	return intlMiddleware(request);
+}
+
+export const config = {
+	matcher: [
+		"/((?!api|_next|_vercel|.*\\..*|robots\\.txt|sitemap\\.xml|google21a790a2c23c0ec5\\.html).*)",
+	],
+};
diff --git a/next.config.mjs b/next.config.mjs
index 52c8a56..a24aa19 100644
--- a/next.config.mjs
+++ b/next.config.mjs
@@ -1,3 +1,7 @@
+import createNextIntlPlugin from "next-intl/plugin";
+
+const withNextIntl = createNextIntlPlugin("./i18n/request.js");
+
 /** @type {import('next').NextConfig} */
 const nextConfig = {
 	// A imagem Docker liga isto (NEXT_OUTPUT=standalone) para empacotar só o que
@@ -13,4 +17,5 @@ const nextConfig = {
 	},
 };
 
-export default nextConfig;
+export default withNextIntl(nextConfig);
+
diff --git a/package-lock.json b/package-lock.json
index 47d8e9a..3b9c0ed 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,6 +11,7 @@
         "googleapis": "^165.0.0",
         "lucide-react": "^1.16.0",
         "next": "^15.5.28",
+        "next-intl": "^4.14.9",
         "next-themes": "^0.4.6",
         "react": "19.1.0",
         "react-dom": "19.1.0"
@@ -37,6 +38,31 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/@eloqnt/config": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/@eloqnt/config/-/config-0.1.1.tgz",
+      "integrity": "sha512-YRDigSaiJEzKDfzTth5kG+L/PKfB3mo8h7yNzpXExPfvQmcD05WoZT57PdhJE0jI+Vva6eb0OCU8hnHHgdME3g==",
+      "license": "MIT"
+    },
+    "node_modules/@eloqnt/format-json": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/@eloqnt/format-json/-/format-json-0.1.0.tgz",
+      "integrity": "sha512-4Pkb+HyzgWNJXoU48aJhUyNZSjZvMGooPCNG1ZFmBm55xTiNNPQCNXH66Ob6sXS6RvbWZrRpCf+Uo/Jz9K9g+A==",
+      "license": "MIT",
+      "dependencies": {
+        "@eloqnt/config": "^0.1.0"
+      }
+    },
+    "node_modules/@eloqnt/format-po": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/@eloqnt/format-po/-/format-po-0.1.1.tgz",
+      "integrity": "sha512-aLtmIoqXGEaeTT0RcsLN8sZ3aIrsT/c/dVs28zrLhDjO3+vA3KNP+r98N0xq8w/k36+/GIUt4uZNbqcA71GVWw==",
+      "license": "MIT",
+      "dependencies": {
+        "@eloqnt/config": "^0.1.1",
+        "po-parser": "^2.2.0"
+      }
+    },
     "node_modules/@emnapi/core": {
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/@emnapi/core/-/core-1.10.0.tgz",
@@ -214,6 +240,36 @@
         "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       }
     },
+    "node_modules/@formatjs/fast-memoize": {
+      "version": "3.1.7",
+      "resolved": "https://registry.npmjs.org/@formatjs/fast-memoize/-/fast-memoize-3.1.7.tgz",
+      "integrity": "sha512-zXfhLpvA6T7+efdt9JLbBwZ00tT7NsBMDVnDu8rpHeNNv8KfRZAMo2gkG0k9lK/Nzc//3kJ9pImsfuJxk3KhUA==",
+      "license": "MIT"
+    },
+    "node_modules/@formatjs/icu-messageformat-parser": {
+      "version": "3.5.22",
+      "resolved": "https://registry.npmjs.org/@formatjs/icu-messageformat-parser/-/icu-messageformat-parser-3.5.22.tgz",
+      "integrity": "sha512-YuwN+dDKgssfuYwtOyGQD0CSn7K46g9cv1Fp0VgKpjZDDFvv8b8crzP990IcJhRPWHhKzCGsbUSJVIguyyFA5A==",
+      "license": "MIT",
+      "dependencies": {
+        "@formatjs/icu-skeleton-parser": "2.1.12"
+      }
+    },
+    "node_modules/@formatjs/icu-skeleton-parser": {
+      "version": "2.1.12",
+      "resolved": "https://registry.npmjs.org/@formatjs/icu-skeleton-parser/-/icu-skeleton-parser-2.1.12.tgz",
+      "integrity": "sha512-ca7tZMLpfHX3sUD7hP6gE/qr6Iq89EDd3ZLeRhbsB7r0UD55DGJq+tmFLzrGrnx5StahUevQmQQVtbDRHsfDHA==",
+      "license": "MIT"
+    },
+    "node_modules/@formatjs/intl-localematcher": {
+      "version": "0.8.14",
+      "resolved": "https://registry.npmjs.org/@formatjs/intl-localematcher/-/intl-localematcher-0.8.14.tgz",
+      "integrity": "sha512-8O7V38QmbB11+ryJ3KM/znrzXtiqgpXzqNoqDsndHZZ5/zDKTTL+cf5F0mzXkQEwhx8IlWnqYvEovf2S5EwLTw==",
+      "license": "MIT",
+      "dependencies": {
+        "@formatjs/fast-memoize": "3.1.7"
+      }
+    },
     "node_modules/@humanfs/core": {
       "version": "0.19.2",
       "resolved": "https://registry.npmjs.org/@humanfs/core/-/core-0.19.2.tgz",
@@ -1108,6 +1164,310 @@
         "node": ">=12.4.0"
       }
     },
+    "node_modules/@parcel/watcher": {
+      "version": "2.6.0",
+      "resolved": "https://registry.npmjs.org/@parcel/watcher/-/watcher-2.6.0.tgz",
+      "integrity": "sha512-7FNeNl8NCE7aINx7WXiKQrPYZWC/hvrTsmk6zmxbI7LTXE7hVek/n8AfVgpe2y82zl3w0HvCHN0bVKMBoJcC0w==",
+      "hasInstallScript": true,
+      "license": "MIT",
+      "dependencies": {
+        "detect-libc": "^2.0.3",
+        "is-glob": "^4.0.3",
+        "node-addon-api": "^7.0.0",
+        "picomatch": "^4.0.4"
+      },
+      "engines": {
+        "node": ">= 10.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/parcel"
+      },
+      "optionalDependencies": {
+        "@parcel/watcher-android-arm64": "2.6.0",
+        "@parcel/watcher-darwin-arm64": "2.6.0",
+        "@parcel/watcher-darwin-x64": "2.6.0",
+        "@parcel/watcher-freebsd-x64": "2.6.0",
+        "@parcel/watcher-linux-arm-glibc": "2.6.0",
+        "@parcel/watcher-linux-arm-musl": "2.6.0",
+        "@parcel/watcher-linux-arm64-glibc": "2.6.0",
+        "@parcel/watcher-linux-arm64-musl": "2.6.0",
+        "@parcel/watcher-linux-x64-glibc": "2.6.0",
+        "@parcel/watcher-linux-x64-musl": "2.6.0",
+        "@parcel/watcher-win32-arm64": "2.6.0",
+        "@parcel/watcher-win32-x64": "2.6.0"
+      }
+    },
+    "node_modules/@parcel/watcher-android-arm64": {
+      "version": "2.6.0",
+      "resolved": "https://registry.npmjs.org/@parcel/watcher-android-arm64/-/watcher-android-arm64-2.6.0.tgz",
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+        "arm64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
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+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/parcel"
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+        "arm64"
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+        "type": "opencollective",
+        "url": "https://opencollective.com/parcel"
+      }
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+        "arm"
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+      "optional": true,
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+        "url": "https://opencollective.com/parcel"
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+        "x64"
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+        "glibc"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
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+        "url": "https://opencollective.com/parcel"
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+      "version": "4.14.9",
+      "resolved": "https://registry.npmjs.org/next-intl-swc-plugin-extractor/-/next-intl-swc-plugin-extractor-4.14.9.tgz",
+      "integrity": "sha512-8jAkmDwQJo6RDavBHm9QRl1YTn2WXf+rI4SVhMaZxZcxopnwZic6fKTXOoNIo3kzC+a6vJySkOkXmHTVFLAYtg==",
+      "license": "MIT"
+    },
+    "node_modules/next-intl/node_modules/@swc/core": {
+      "version": "1.16.21",
+      "resolved": "https://registry.npmjs.org/@swc/core/-/core-1.16.21.tgz",
+      "integrity": "sha512-sE2asan0US6gcp11oBDFJb5+s+ltaAPBcagVQGub1+qo+8TsQET2TmXfJCw/Oy0w1eEPp1rV1wsR/Umx2KXGcw==",
+      "hasInstallScript": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@swc/counter": "^0.1.3",
+        "@swc/types": "^0.1.28"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/swc"
+      },
+      "optionalDependencies": {
+        "@swc/core-darwin-arm64": "1.16.21",
+        "@swc/core-darwin-x64": "1.16.21",
+        "@swc/core-linux-arm-gnueabihf": "1.16.21",
+        "@swc/core-linux-arm64-gnu": "1.16.21",
+        "@swc/core-linux-arm64-musl": "1.16.21",
+        "@swc/core-linux-ppc64-gnu": "1.16.21",
+        "@swc/core-linux-s390x-gnu": "1.16.21",
+        "@swc/core-linux-x64-gnu": "1.16.21",
+        "@swc/core-linux-x64-musl": "1.16.21",
+        "@swc/core-win32-arm64-msvc": "1.16.21",
+        "@swc/core-win32-ia32-msvc": "1.16.21",
+        "@swc/core-win32-x64-msvc": "1.16.21"
+      },
+      "peerDependencies": {
+        "@swc/helpers": ">=0.5.17"
+      },
+      "peerDependenciesMeta": {
+        "@swc/helpers": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/next-themes": {
       "version": "0.4.6",
       "resolved": "https://registry.npmjs.org/next-themes/-/next-themes-0.4.6.tgz",
@@ -5448,6 +6185,12 @@
         "react-dom": "^16.8 || ^17 || ^18 || ^19 || ^19.0.0-rc"
       }
     },
+    "node_modules/node-addon-api": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/node-addon-api/-/node-addon-api-7.1.1.tgz",
+      "integrity": "sha512-5m3bsyrjFWE1xf7nz7YXdN4udnVtXK6/Yfgn5qnahL6bCkf2yKt4k3nuTKAtT4r3IG8JNR2ncsIMdZuAzJjHQQ==",
+      "license": "MIT"
+    },
     "node_modules/node-domexception": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/node-domexception/-/node-domexception-1.0.0.tgz",
@@ -5786,6 +6529,12 @@
         "url": "https://github.com/sponsors/jonschlinkert"
       }
     },
+    "node_modules/po-parser": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/po-parser/-/po-parser-2.2.0.tgz",
+      "integrity": "sha512-NdTrKgh0oO7+y+RFX8KKhOB438x/j94UGXEFzl/7pHH0JjWSn42iJ9tgmPksIO6n1JKDHmNDcejPJfKspljB9g==",
+      "license": "MIT"
+    },
     "node_modules/possible-typed-array-names": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/possible-typed-array-names/-/possible-typed-array-names-1.1.0.tgz",
@@ -7009,6 +7758,33 @@
       "integrity": "sha512-XdVKMF4SJ0nP/O7XIPB0JwAEuT9lDIYnNsK8yGVe43y0AWoKeJNdv3ZNWh7ksJ6KqQFjOO6ox/VEitLnaVNufw==",
       "license": "BSD"
     },
+    "node_modules/use-intl": {
+      "version": "4.14.9",
+      "resolved": "https://registry.npmjs.org/use-intl/-/use-intl-4.14.9.tgz",
+      "integrity": "sha512-37ktvdCCz+6JY2VFPl/GV69Ds4ahiUT2c2xEZZRZYxdgGLxFsUbdxzjQVRm3YMIOUU0VPs6zvlifb4Yjk4IxIg==",
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://github.com/sponsors/amannn"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "@formatjs/fast-memoize": "^3.1.0",
+        "@schummar/icu-type-parser": "1.21.5",
+        "icu-minify": "^4.14.9",
+        "intl-messageformat": "^11.1.0"
+      },
+      "peerDependencies": {
+        "@types/react": "^17.0.0 || ^18.0.0 || ^19.0.0",
+        "react": "^17.0.0 || ^18.0.0 || >=19.0.0-rc <19.0.0 || ^19.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@types/react": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/web-streams-polyfill": {
       "version": "3.3.3",
       "resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-3.3.3.tgz",
diff --git a/package.json b/package.json
index 3248dfb..cae5bdb 100644
--- a/package.json
+++ b/package.json
@@ -17,6 +17,7 @@
     "googleapis": "^165.0.0",
     "lucide-react": "^1.16.0",
     "next": "^15.5.28",
+    "next-intl": "^4.14.9",
     "next-themes": "^0.4.6",
     "react": "19.1.0",
     "react-dom": "19.1.0"
diff --git a/scripts/auditar-paginas.mjs b/scripts/auditar-paginas.mjs
index 6de745a..bf21502 100644
--- a/scripts/auditar-paginas.mjs
+++ b/scripts/auditar-paginas.mjs
@@ -92,6 +92,7 @@ function obterRotasExistentes() {
 		if (arq.endsWith("page.jsx") || arq.endsWith("page.js")) {
 			let rota = arq
 				.replace(/^app/, "")
+				.replace(/\/\[locale\]/, "")
 				.replace(/\/page\.(jsx|js)$/, "");
 			if (rota === "") rota = "/";
 			rotas.add(rota);
@@ -132,7 +133,12 @@ function auditarPerformanceConfigs() {
 
 	// Checar globals.css e layout.jsx para transições no body
 	const globalsCss = existsSync("app/globals.css") ? readFileSync("app/globals.css", "utf8") : "";
-	const layoutJsx = existsSync("app/layout.jsx") ? readFileSync("app/layout.jsx", "utf8") : "";
+	const layoutPath = existsSync("app/[locale]/layout.jsx")
+		? "app/[locale]/layout.jsx"
+		: existsSync("app/layout.jsx")
+		? "app/layout.jsx"
+		: null;
+	const layoutJsx = layoutPath ? readFileSync(layoutPath, "utf8") : "";
 
 	if (globalsCss.includes("body {\n\t\t@apply bg-slate-50 text-slate-900 transition-colors")) {
 		falha("globals.css tem transition-colors global no body (provoca animações não compostas no load).");
@@ -299,7 +305,8 @@ function auditarRotasInternas() {
 			if (caminho.startsWith("/api") || caminho.startsWith("/favicon") || caminho.startsWith("/icon") || caminho.startsWith("/logo") || caminho.startsWith("/site.webmanifest")) {
 				continue;
 			}
-			const existe = rotasValidas.has(caminho) || rotasDinamicas.some((rx) => rx.test(caminho));
+			const caminhoSemLocale = caminho.replace(/^\/(?:pt|en|es|fr|de|zh-CN)(?=\/|$)/, "") || "/";
+			const existe = rotasValidas.has(caminho) || rotasValidas.has(caminhoSemLocale) || rotasDinamicas.some((rx) => rx.test(caminho) || rx.test(caminhoSemLocale));
 			if (!existe) {
 				falha(`${arq} -> Link interno aponta para rota inexistente: '${caminho}'`);
 				rotasQuebradas++;