diff --git a/packages/tailwindcss-language-server/tests/fixtures/custom-classes/package-lock.json b/packages/tailwindcss-language-server/tests/fixtures/custom-classes/package-lock.json
new file mode 100644
index 00000000..b88b9397
--- /dev/null
+++ b/packages/tailwindcss-language-server/tests/fixtures/custom-classes/package-lock.json
@@ -0,0 +1,1370 @@
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+      "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^8.0.0",
+        "is-fullwidth-code-point": "^3.0.0",
+        "strip-ansi": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/wrap-ansi-cjs/node_modules/strip-ansi": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/yaml": {
+      "version": "2.8.0",
+      "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.8.0.tgz",
+      "integrity": "sha512-4lLa/EcQCB0cJkyts+FpIRx5G/llPxfP6VQU5KByHEhLxY3IJCH0f0Hy1MHI8sClTvsIb8qwRJ6R/ZdlDJ/leQ==",
+      "license": "ISC",
+      "bin": {
+        "yaml": "bin.mjs"
+      },
+      "engines": {
+        "node": ">= 14.6"
+      }
+    }
+  }
+}
diff --git a/packages/tailwindcss-language-server/tests/fixtures/custom-classes/package.json b/packages/tailwindcss-language-server/tests/fixtures/custom-classes/package.json
new file mode 100644
index 00000000..2a200859
--- /dev/null
+++ b/packages/tailwindcss-language-server/tests/fixtures/custom-classes/package.json
@@ -0,0 +1,7 @@
+{
+  "name": "custom-classes-test",
+  "version": "1.0.0",
+  "dependencies": {
+    "tailwindcss": "3.4.17"
+  }
+}
diff --git a/packages/tailwindcss-language-server/tests/fixtures/custom-classes/styles.css b/packages/tailwindcss-language-server/tests/fixtures/custom-classes/styles.css
new file mode 100644
index 00000000..1b789b26
--- /dev/null
+++ b/packages/tailwindcss-language-server/tests/fixtures/custom-classes/styles.css
@@ -0,0 +1,27 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+.custom-button {
+  background-color: #1a9dd9;
+  color: white;
+  padding: 0.5rem 1rem;
+  border-radius: 0.25rem;
+  font-weight: 600;
+}
+
+.typography-h3 {
+  font-family: Montserrat;
+  font-size: 48px;
+  font-style: normal;
+  font-weight: 700;
+  line-height: 116.7%;
+}
+
+.card {
+  background-color: white;
+  border: 1px solid #e5e7eb;
+  border-radius: 0.5rem;
+  padding: 1.5rem;
+  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
+}
diff --git a/packages/tailwindcss-language-server/tests/fixtures/custom-classes/tailwind.config.js b/packages/tailwindcss-language-server/tests/fixtures/custom-classes/tailwind.config.js
new file mode 100644
index 00000000..bcc47b32
--- /dev/null
+++ b/packages/tailwindcss-language-server/tests/fixtures/custom-classes/tailwind.config.js
@@ -0,0 +1,7 @@
+module.exports = {
+  content: ['./**/*.{html,js,ts,jsx,tsx}'],
+  theme: {
+    extend: {},
+  },
+  plugins: [],
+}
diff --git a/packages/tailwindcss-language-service/src/completionProvider.ts b/packages/tailwindcss-language-service/src/completionProvider.ts
index 570ca535..de00405b 100644
--- a/packages/tailwindcss-language-service/src/completionProvider.ts
+++ b/packages/tailwindcss-language-service/src/completionProvider.ts
@@ -15,7 +15,12 @@ import removeMeta from './util/removeMeta'
 import { formatColor, getColor, getColorFromValue } from './util/color'
 import { isHtmlContext, isHtmlDoc } from './util/html'
 import { isCssContext } from './util/css'
-import { findLast, matchClassAttributes, matchClassFunctions } from './util/find'
+import {
+  findClassNamesInRange,
+  findLast,
+  matchClassAttributes,
+  matchClassFunctions,
+} from './util/find'
 import { stringifyConfigValue, stringifyCss } from './util/stringify'
 import { stringifyScreen, Screen } from './util/screens'
 import isObject from './util/isObject'
@@ -282,36 +287,44 @@ export function completionsFromClassList(
       }
     }
 
-    return withDefaults(
-      {
-        isIncomplete: false,
-        items: items.concat(
-          state.classList.reduce<CompletionItem[]>((items, [className, { color }], index) => {
-            if (state.blocklist?.includes([...existingVariants, className].join(state.separator))) {
-              return items
-            }
+    // Add custom CSS classes to completions
+    let allItems = items.concat(
+      state.classList.reduce<CompletionItem[]>((items, [className, { color }], index) => {
+        if (state.blocklist?.includes([...existingVariants, className].join(state.separator))) {
+          return items
+        }
 
-            let kind = color ? CompletionItemKind.Color : CompletionItemKind.Constant
-            let documentation: string | undefined
+        let kind = color ? CompletionItemKind.Color : CompletionItemKind.Constant
+        let documentation: string | undefined
 
-            if (color && typeof color !== 'string') {
-              documentation = formatColor(color)
-            }
+        if (color && typeof color !== 'string') {
+          documentation = formatColor(color)
+        }
 
-            if (prefix.length > 0 && existingVariants.length === 0) {
-              className = `${prefix}:${className}`
-            }
+        if (prefix.length > 0 && existingVariants.length === 0) {
+          className = `${prefix}:${className}`
+        }
+
+        items.push({
+          label: className,
+          kind,
+          ...(documentation ? { documentation } : {}),
+          sortText: naturalExpand(index, state.classList.length),
+        })
+
+        return items
+      }, [] as CompletionItem[]),
+    )
 
-            items.push({
-              label: className,
-              kind,
-              ...(documentation ? { documentation } : {}),
-              sortText: naturalExpand(index, state.classList.length),
-            })
+    // Add custom CSS classes if they exist
+    if (state.customCssClasses && state.customCssClasses.length > 0) {
+      allItems = allItems.concat(state.customCssClasses)
+    }
 
-            return items
-          }, [] as CompletionItem[]),
-        ),
+    return withDefaults(
+      {
+        isIncomplete: false,
+        items: allItems,
       },
       {
         data: {
@@ -2231,6 +2244,13 @@ export async function doComplete(
 ): Promise<CompletionList | null> {
   if (state === null) return { items: [], isIncomplete: false }
 
+  const customClassNames = await provideCustomClassNameCompletions(
+    state,
+    document,
+    position,
+    context,
+  )
+
   const result =
     (await provideClassNameCompletions(state, document, position, context)) ||
     (await provideThemeDirectiveCompletions(state, document, position)) ||
@@ -2264,6 +2284,22 @@ export async function resolveCompletionItem(
     return item
   }
 
+  // Handle custom CSS classes
+  if (item.data?._type === 'custom-css-class') {
+    const declarations = item.data.declarations as Record<string, string>
+    if (declarations) {
+      const cssRules = Object.entries(declarations)
+        .map(([prop, value]) => `  ${prop}: ${value};`)
+        .join('\n')
+
+      item.documentation = {
+        kind: 'markdown' as typeof MarkupKind.Markdown,
+        value: `\`\`\`css\n.${item.label} {\n${cssRules}\n}\n\`\`\``,
+      }
+    }
+    return item
+  }
+
   if (item.data?._type === 'screen') {
     let screens = dlv(state.config, ['theme', 'screens'], dlv(state.config, ['screens'], {}))
     if (!isObject(screens)) screens = {}
diff --git a/packages/tailwindcss-language-service/src/hoverProvider.ts b/packages/tailwindcss-language-service/src/hoverProvider.ts
index 583cc80f..9359c708 100644
--- a/packages/tailwindcss-language-service/src/hoverProvider.ts
+++ b/packages/tailwindcss-language-service/src/hoverProvider.ts
@@ -99,6 +99,27 @@ async function provideClassNameHover(
   let className = await findClassNameAtPosition(state, document, position)
   if (className === null) return null
 
+  // Check if this is a custom CSS class
+  if (state.customCssClasses && state.customCssClasses.length > 0) {
+    const customClass = state.customCssClasses.find((cls) => cls.label === className.className)
+    if (customClass) {
+      const declarations = customClass.data?.declarations as Record<string, string>
+      if (declarations) {
+        const cssRules = Object.entries(declarations)
+          .map(([prop, value]) => `  ${prop}: ${value};`)
+          .join('\n')
+
+        return {
+          contents: {
+            language: 'css',
+            value: `.${className.className} {\n${cssRules}\n}`,
+          },
+          range: className.range,
+        }
+      }
+    }
+  }
+
   if (state.v4) {
     let root = state.designSystem.compile([className.className])[0]
 
diff --git a/packages/tailwindcss-language-service/src/util/css-class-scanner.test.ts b/packages/tailwindcss-language-service/src/util/css-class-scanner.test.ts
new file mode 100644
index 00000000..ef16902d
--- /dev/null
+++ b/packages/tailwindcss-language-service/src/util/css-class-scanner.test.ts
@@ -0,0 +1,96 @@
+import { expect, test } from 'vitest'
+import { extractCustomClassesFromCss } from './css-class-scanner'
+
+test('extract custom CSS classes from CSS content', async ({ expect }) => {
+  const css = `
+    .typography-h3 {
+      font-family: Montserrat;
+      font-size: 48px;
+      font-style: normal;
+      font-weight: 700;
+      line-height: 116.7%;
+    }
+
+    .custom-button {
+      background-color: #1a9dd9;
+      color: white;
+      padding: 0.5rem 1rem;
+      border-radius: 0.25rem;
+    }
+
+    /* This should be ignored as it's a Tailwind utility */
+    .text-blue-500 {
+      color: #3b82f6;
+    }
+
+    /* This should be ignored as it has pseudo-selectors */
+    .hover\:bg-blue-500:hover {
+      background-color: #3b82f6;
+    }
+  `
+
+  const classes = extractCustomClassesFromCss(css, 'test.css')
+
+  expect(classes).toHaveLength(2)
+  expect(classes[0]).toEqual({
+    className: 'typography-h3',
+    source: 'test.css',
+    declarations: {
+      'font-family': 'Montserrat',
+      'font-size': '48px',
+      'font-style': 'normal',
+      'font-weight': '700',
+      'line-height': '116.7%',
+    },
+  })
+  expect(classes[1]).toEqual({
+    className: 'custom-button',
+    source: 'test.css',
+    declarations: {
+      'background-color': '#1a9dd9',
+      color: 'white',
+      padding: '0.5rem 1rem',
+      'border-radius': '0.25rem',
+    },
+  })
+})
+
+test('ignore Tailwind utility classes', async ({ expect }) => {
+  const css = `
+    .text-blue-500 {
+      color: #3b82f6;
+    }
+
+    .bg-red-500 {
+      background-color: #ef4444;
+    }
+
+    .p-4 {
+      padding: 1rem;
+    }
+  `
+
+  const classes = extractCustomClassesFromCss(css, 'test.css')
+
+  expect(classes).toHaveLength(0)
+})
+
+test('ignore complex selectors', async ({ expect }) => {
+  const css = `
+    .button:hover {
+      background-color: #1a9dd9;
+    }
+
+    .input[type="text"] {
+      border: 1px solid #ccc;
+    }
+
+    .nav > li {
+      display: inline-block;
+    }
+  `
+
+  const classes = extractCustomClassesFromCss(css, 'test.css')
+
+  expect(classes).toHaveLength(0)
+})
diff --git a/packages/tailwindcss-language-service/src/util/css-class-scanner.ts b/packages/tailwindcss-language-service/src/util/css-class-scanner.ts
new file mode 100644
index 00000000..753e5f9e
--- /dev/null
+++ b/packages/tailwindcss-language-service/src/util/css-class-scanner.ts
@@ -0,0 +1,167 @@
+import * as postcss from 'postcss'
+import selectorParser from 'postcss-selector-parser'
+import { CompletionItemKind } from 'vscode-languageserver'
+import * as fs from 'node:fs/promises'
+import type { State } from './state'
+
+interface ScannedClass {
+  className: string
+  source: string
+  declarations: Record<string, string>
+}
+
+/**
+ * Extract custom CSS classes from CSS content
+ */
+export function extractCustomClassesFromCss(css: string, source: string): ScannedClass[] {
+  const classes: ScannedClass[] = []
+
+  try {
+    const root = postcss.parse(css)
+
+    root.walkRules((rule) => {
+      // Skip Tailwind utility classes (they typically have many hyphens and are generated)
+      // Focus on custom classes that are more likely to be user-defined
+      if (isLikelyCustomClass(rule.selector)) {
+        const classNames = extractClassNamesFromSelector(rule.selector)
+
+        for (const className of classNames) {
+          const declarations: Record<string, string> = {}
+
+          rule.walkDecls((decl) => {
+            declarations[decl.prop] = decl.value
+          })
+
+          classes.push({
+            className,
+            source,
+            declarations,
+          })
+        }
+      }
+    })
+  } catch (error) {
+    console.error(`Error parsing CSS from ${source}:`, error)
+  }
+
+  return classes
+}
+
+/**
+ * Check if a selector is likely to be a custom class (not a Tailwind utility)
+ */
+function isLikelyCustomClass(selector: string): boolean {
+  // Skip if it's not a class selector
+  if (!selector.includes('.')) return false
+
+  // Skip if it's a Tailwind utility class (many hyphens, typically)
+  if (selector.includes('--')) return false
+
+  // Skip if it looks like a Tailwind utility (many hyphens in sequence)
+  if (/([a-z]+-){3,}/.test(selector)) return false
+
+  // Skip pseudo-selectors and complex selectors for now
+  if (selector.includes(':')) return false
+  if (selector.includes('[')) return false
+  if (selector.includes('>')) return false
+  if (selector.includes('+')) return false
+  if (selector.includes('~')) return false
+
+  // Skip if it has a pattern like color-number (e.g., blue-500, red-500)
+  const className = selector.replace(/^\./, '')
+  if (/^[a-z]+-\d+$/.test(className)) return false
+
+  // Skip if it has multiple hyphens and ends with a number (common Tailwind pattern)
+  // But allow patterns like typography-h3, button-primary, etc.
+  if (/^[a-z-]+\d+$/.test(className) && !/^[a-z]+-[a-z]+\d+$/.test(className)) return false
+
+  // Skip common Tailwind utility patterns
+  const tailwindPatterns = [
+    /^text-[a-z]+-\d+$/, // text-blue-500
+    /^bg-[a-z]+-\d+$/, // bg-red-500
+    /^p-\d+$/, // p-4
+    /^m-\d+$/, // m-4
+    /^w-\d+$/, // w-4
+    /^h-\d+$/, // h-4
+    /^flex-[a-z]+$/, // flex-row
+    /^grid-[a-z]+$/, // grid-cols-2
+    /^border-[a-z]+-\d+$/, // border-gray-200
+    /^rounded-[a-z]+$/, // rounded-lg
+    /^shadow-[a-z]+$/, // shadow-lg
+  ]
+
+  for (const pattern of tailwindPatterns) {
+    if (pattern.test(className)) return false
+  }
+
+  return true
+}
+
+/**
+ * Extract class names from a CSS selector
+ */
+function extractClassNamesFromSelector(selector: string): string[] {
+  const classNames: string[] = []
+
+  try {
+    const { nodes: subSelectors } = selectorParser().astSync(selector)
+
+    for (const subSelector of subSelectors) {
+      if (subSelector.type !== 'selector') continue
+
+      for (const node of subSelector.nodes) {
+        if (node.type === 'class') {
+          classNames.push(node.value.trim())
+        }
+      }
+    }
+  } catch (error) {
+    console.error(`Error parsing selector "${selector}":`, error)
+  }
+
+  return classNames
+}
+
+/**
+ * Scan CSS files for custom classes and add them to the state
+ */
+export async function scanCssFilesForCustomClasses(
+  state: State,
+  cssFiles: string[],
+): Promise<void> {
+  // This works for both v3 and v4 projects
+
+  const customClasses: ScannedClass[] = []
+
+  for (const cssFile of cssFiles) {
+    try {
+      const content = await fs.readFile(cssFile, 'utf-8')
+      const classes = extractCustomClassesFromCss(content, cssFile)
+      customClasses.push(...classes)
+    } catch (error) {
+      console.error(`Error reading CSS file ${cssFile}:`, error)
+    }
+  }
+
+  // Add custom classes to the state
+  if (customClasses.length > 0) {
+    // Create completion items for custom classes
+    const customClassItems = customClasses.map((cls, index) => ({
+      label: cls.className,
+      kind: CompletionItemKind.Constant,
+      detail: `Custom CSS class from ${cls.source}`,
+      sortText: `custom-${index.toString().padStart(6, '0')}`,
+      data: {
+        _type: 'custom-css-class',
+        source: cls.source,
+        declarations: cls.declarations,
+      },
+    }))
+
+    // Store custom classes in state for later use
+    if (!state.customCssClasses) {
+      state.customCssClasses = []
+    }
+    state.customCssClasses.push(...customClassItems)
+  }
+}
diff --git a/packages/tailwindcss-language-service/src/util/state.ts b/packages/tailwindcss-language-service/src/util/state.ts
index ecd9d0d8..30b1815c 100644
--- a/packages/tailwindcss-language-service/src/util/state.ts
+++ b/packages/tailwindcss-language-service/src/util/state.ts
@@ -145,6 +145,17 @@ export interface State {
   pluginVersions?: string
   completionItemData?: Record<string, any>
   features: Feature[]
+  customCssClasses?: Array<{
+    label: string
+    kind: import('vscode-languageserver').CompletionItemKind
+    detail: string
+    sortText: string
+    data: {
+      _type: string
+      source: string
+      declarations: Record<string, string>
+    }
+  }>
   // postcssPlugins?: { before: any[]; after: any[] }
 }