diff --git a/packages/tailwindcss-language-server/src/project-locator.test.ts b/packages/tailwindcss-language-server/src/project-locator.test.ts
index 85a2dbef..ee62be76 100644
--- a/packages/tailwindcss-language-server/src/project-locator.test.ts
+++ b/packages/tailwindcss-language-server/src/project-locator.test.ts
@@ -152,6 +152,19 @@ testFixture('v4/auto-content', [
},
])
+testFixture('v4/auto-content-split', [
+ //
+ {
+ config: 'src/app.css',
+ content: [
+ '{URL}/package.json',
+ '{URL}/src/index.html',
+ '{URL}/src/components/example.html',
+ '{URL}/src/**/*.{py,tpl,js,vue,php,mjs,cts,jsx,tsx,rhtml,slim,handlebars,twig,rs,njk,svelte,liquid,pug,md,ts,heex,mts,astro,nunjucks,rb,eex,haml,cjs,html,hbs,jade,aspx,razor,erb,mustache,mdx}',
+ ],
+ },
+])
+
testFixture('v4/custom-source', [
//
{
diff --git a/packages/tailwindcss-language-server/src/project-locator.ts b/packages/tailwindcss-language-server/src/project-locator.ts
index e76033d3..0c025914 100644
--- a/packages/tailwindcss-language-server/src/project-locator.ts
+++ b/packages/tailwindcss-language-server/src/project-locator.ts
@@ -661,7 +661,7 @@ class FileEntry {
isMaybeTailwindRelated(): boolean {
if (!this.content) return false
- let HAS_IMPORT = /@import\s*('[^']+'|"[^"]+");/
+ let HAS_IMPORT = /@import\s*['"]/
let HAS_TAILWIND = /@tailwind\s*[^;]+;/
let HAS_DIRECTIVE = /@(theme|plugin|config|utility|variant|apply)\s*[^;{]+[;{]/
diff --git a/packages/tailwindcss-language-server/tests/fixtures/v4/auto-content-split/package-lock.json b/packages/tailwindcss-language-server/tests/fixtures/v4/auto-content-split/package-lock.json
new file mode 100644
index 00000000..bf53ae15
--- /dev/null
+++ b/packages/tailwindcss-language-server/tests/fixtures/v4/auto-content-split/package-lock.json
@@ -0,0 +1,200 @@
+{
+ "name": "auto-content-split",
+ "lockfileVersion": 3,
+ "requires": true,
+ "packages": {
+ "": {
+ "dependencies": {
+ "@tailwindcss/oxide": "^4.0.0-alpha.25",
+ "tailwindcss": "^4.0.0-alpha.25"
+ }
+ },
+ "node_modules/@tailwindcss/oxide": {
+ "version": "4.0.0-alpha.25",
+ "resolved": "https://registry.npmjs.org/@tailwindcss/oxide/-/oxide-4.0.0-alpha.25.tgz",
+ "integrity": "sha512-B5ynEG7AuiYrIY8a+IZZ23fPAzMfViemqtt6A0CBC1qdEXQoUfX9IuZ/s6eGAaUQ+Ify+5rfCPyUFZPQHC8kGQ==",
+ "license": "MIT",
+ "engines": {
+ "node": ">= 10"
+ },
+ "optionalDependencies": {
+ "@tailwindcss/oxide-android-arm64": "4.0.0-alpha.25",
+ "@tailwindcss/oxide-darwin-arm64": "4.0.0-alpha.25",
+ "@tailwindcss/oxide-darwin-x64": "4.0.0-alpha.25",
+ "@tailwindcss/oxide-freebsd-x64": "4.0.0-alpha.25",
+ "@tailwindcss/oxide-linux-arm-gnueabihf": "4.0.0-alpha.25",
+ "@tailwindcss/oxide-linux-arm64-gnu": "4.0.0-alpha.25",
+ "@tailwindcss/oxide-linux-arm64-musl": "4.0.0-alpha.25",
+ "@tailwindcss/oxide-linux-x64-gnu": "4.0.0-alpha.25",
+ "@tailwindcss/oxide-linux-x64-musl": "4.0.0-alpha.25",
+ "@tailwindcss/oxide-win32-x64-msvc": "4.0.0-alpha.25"
+ }
+ },
+ "node_modules/@tailwindcss/oxide-android-arm64": {
+ "version": "4.0.0-alpha.25",
+ "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-android-arm64/-/oxide-android-arm64-4.0.0-alpha.25.tgz",
+ "integrity": "sha512-3YOWSqtVRxw7cQMlkZsIax4J6+0oeCCZzl7bsJXdorHCW4UQuNZWsnGo3u58fON2/H6TM8O38LY18NS/ibPtog==",
+ "cpu": [
+ "arm64"
+ ],
+ "license": "MIT",
+ "optional": true,
+ "os": [
+ "android"
+ ],
+ "engines": {
+ "node": ">= 10"
+ }
+ },
+ "node_modules/@tailwindcss/oxide-darwin-arm64": {
+ "version": "4.0.0-alpha.25",
+ "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-darwin-arm64/-/oxide-darwin-arm64-4.0.0-alpha.25.tgz",
+ "integrity": "sha512-YlfFSA7HTFELwspc4jFF5e9SO/Yj2wXpMOHPLiXKix3ykK44703mSs/JHRIJApL0cLYL12Xk2cJDXu/kvf3zDA==",
+ "cpu": [
+ "arm64"
+ ],
+ "license": "MIT",
+ "optional": true,
+ "os": [
+ "darwin"
+ ],
+ "engines": {
+ "node": ">= 10"
+ }
+ },
+ "node_modules/@tailwindcss/oxide-darwin-x64": {
+ "version": "4.0.0-alpha.25",
+ "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-darwin-x64/-/oxide-darwin-x64-4.0.0-alpha.25.tgz",
+ "integrity": "sha512-Ml9nmmff/RXtQ3BWXmnMT+UuXa1zpDLv7tUe7Wk5Ji1Vzb+N98TeC307HjM4/nnq+2sivN7NQ0Bezuoc3zeoFQ==",
+ "cpu": [
+ "x64"
+ ],
+ "license": "MIT",
+ "optional": true,
+ "os": [
+ "darwin"
+ ],
+ "engines": {
+ "node": ">= 10"
+ }
+ },
+ "node_modules/@tailwindcss/oxide-freebsd-x64": {
+ "version": "4.0.0-alpha.25",
+ "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-freebsd-x64/-/oxide-freebsd-x64-4.0.0-alpha.25.tgz",
+ "integrity": "sha512-qE4BSZfamzpyX0pTNCGYPxK65v+BbyCP2LyJLLINCf95QDLKMjjHaheJ/VDtJ0t3Yx7fgv4uqkxsavmSYsModA==",
+ "cpu": [
+ "x64"
+ ],
+ "license": "MIT",
+ "optional": true,
+ "os": [
+ "freebsd"
+ ],
+ "engines": {
+ "node": ">= 10"
+ }
+ },
+ "node_modules/@tailwindcss/oxide-linux-arm-gnueabihf": {
+ "version": "4.0.0-alpha.25",
+ "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-linux-arm-gnueabihf/-/oxide-linux-arm-gnueabihf-4.0.0-alpha.25.tgz",
+ "integrity": "sha512-2lHD9BvBzAbxnSxpZ2CTIHTAOwImf78V7WFALoJLx7jpRw/NRkC4UhDdML/qBka2ARGr9C7cwKr7KsI+8FK88w==",
+ "cpu": [
+ "arm"
+ ],
+ "license": "MIT",
+ "optional": true,
+ "os": [
+ "linux"
+ ],
+ "engines": {
+ "node": ">= 10"
+ }
+ },
+ "node_modules/@tailwindcss/oxide-linux-arm64-gnu": {
+ "version": "4.0.0-alpha.25",
+ "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-linux-arm64-gnu/-/oxide-linux-arm64-gnu-4.0.0-alpha.25.tgz",
+ "integrity": "sha512-X8nohOQ/0u1bGoG25/4kZGV2N0aYBuvztTh/iAJwKj2zfZtZ082kv+6Ye4heDIGk2pZslsQchw9mtBkcA8rHVA==",
+ "cpu": [
+ "arm64"
+ ],
+ "license": "MIT",
+ "optional": true,
+ "os": [
+ "linux"
+ ],
+ "engines": {
+ "node": ">= 10"
+ }
+ },
+ "node_modules/@tailwindcss/oxide-linux-arm64-musl": {
+ "version": "4.0.0-alpha.25",
+ "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-linux-arm64-musl/-/oxide-linux-arm64-musl-4.0.0-alpha.25.tgz",
+ "integrity": "sha512-OFb6hRpFD9WgV1EtYifxcB/KuqzUOsEebEAvT7OGu6CaLc0EMTWFOy0vaiF8flp67oofyqoj65Q12p305+SzSw==",
+ "cpu": [
+ "arm64"
+ ],
+ "license": "MIT",
+ "optional": true,
+ "os": [
+ "linux"
+ ],
+ "engines": {
+ "node": ">= 10"
+ }
+ },
+ "node_modules/@tailwindcss/oxide-linux-x64-gnu": {
+ "version": "4.0.0-alpha.25",
+ "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-linux-x64-gnu/-/oxide-linux-x64-gnu-4.0.0-alpha.25.tgz",
+ "integrity": "sha512-hnAWqYGqsjoC2kxJAEMKQoNK4lQfd/k/EZJw7Ep8ETMwEF7Y0bIuT/0IWwQ/JnFkRsYKYYuPt+6VwpJ6nGXclQ==",
+ "cpu": [
+ "x64"
+ ],
+ "license": "MIT",
+ "optional": true,
+ "os": [
+ "linux"
+ ],
+ "engines": {
+ "node": ">= 10"
+ }
+ },
+ "node_modules/@tailwindcss/oxide-linux-x64-musl": {
+ "version": "4.0.0-alpha.25",
+ "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-linux-x64-musl/-/oxide-linux-x64-musl-4.0.0-alpha.25.tgz",
+ "integrity": "sha512-LpE7gYpHZPMHaHivri3bMau/ib3uqSGzsEoKZmMF1FAahsqXS6gjoxlH2zlrQUYSHwcopIJ+uTS2LKn+7SvOiA==",
+ "cpu": [
+ "x64"
+ ],
+ "license": "MIT",
+ "optional": true,
+ "os": [
+ "linux"
+ ],
+ "engines": {
+ "node": ">= 10"
+ }
+ },
+ "node_modules/@tailwindcss/oxide-win32-x64-msvc": {
+ "version": "4.0.0-alpha.25",
+ "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-win32-x64-msvc/-/oxide-win32-x64-msvc-4.0.0-alpha.25.tgz",
+ "integrity": "sha512-LafwWEuJl/2Jba6yArcE49GGA/bGT9GeLo1NyKqi0n7sGAdQwUXKVFWyL3OimNGS335l4cH8uuv3AnstsVm3Bw==",
+ "cpu": [
+ "x64"
+ ],
+ "license": "MIT",
+ "optional": true,
+ "os": [
+ "win32"
+ ],
+ "engines": {
+ "node": ">= 10"
+ }
+ },
+ "node_modules/tailwindcss": {
+ "version": "4.0.0-alpha.25",
+ "resolved": "https://registry.npmjs.org/tailwindcss/-/tailwindcss-4.0.0-alpha.25.tgz",
+ "integrity": "sha512-nysTVicWw8JC06+EAJvT8+4RAV7qZpuKwz0QOpfL88/+XKG+HIrawSz5XxXigF48l37ehZfREbqGiS7cCN90jg==",
+ "license": "MIT"
+ }
+ }
+}
diff --git a/packages/tailwindcss-language-server/tests/fixtures/v4/auto-content-split/package.json b/packages/tailwindcss-language-server/tests/fixtures/v4/auto-content-split/package.json
new file mode 100644
index 00000000..593b6296
--- /dev/null
+++ b/packages/tailwindcss-language-server/tests/fixtures/v4/auto-content-split/package.json
@@ -0,0 +1,6 @@
+{
+ "dependencies": {
+ "tailwindcss": "^4.0.0-alpha.25",
+ "@tailwindcss/oxide": "^4.0.0-alpha.25"
+ }
+}
diff --git a/packages/tailwindcss-language-server/tests/fixtures/v4/auto-content-split/src/app.css b/packages/tailwindcss-language-server/tests/fixtures/v4/auto-content-split/src/app.css
new file mode 100644
index 00000000..7b4dcc31
--- /dev/null
+++ b/packages/tailwindcss-language-server/tests/fixtures/v4/auto-content-split/src/app.css
@@ -0,0 +1,3 @@
+@import "tailwindcss/preflight" layer(base);
+@import "tailwindcss/theme" layer(theme);
+@import "tailwindcss/utilities" layer(utilities);
diff --git a/packages/tailwindcss-language-server/tests/fixtures/v4/auto-content-split/src/components/example.html b/packages/tailwindcss-language-server/tests/fixtures/v4/auto-content-split/src/components/example.html
new file mode 100644
index 00000000..788b45c9
--- /dev/null
+++ b/packages/tailwindcss-language-server/tests/fixtures/v4/auto-content-split/src/components/example.html
@@ -0,0 +1 @@
+Test
diff --git a/packages/tailwindcss-language-server/tests/fixtures/v4/auto-content-split/src/index.html b/packages/tailwindcss-language-server/tests/fixtures/v4/auto-content-split/src/index.html
new file mode 100644
index 00000000..a108a449
--- /dev/null
+++ b/packages/tailwindcss-language-server/tests/fixtures/v4/auto-content-split/src/index.html
@@ -0,0 +1 @@
+Test