diff --git a/docs/DEPENDENCIES.md b/docs/DEPENDENCIES.md
new file mode 100644
index 0000000..0104d50
--- /dev/null
+++ b/docs/DEPENDENCIES.md
@@ -0,0 +1,99 @@
+# 📦 Dependencies Documentation
+
+This document provides information about the core dependencies used in GhostPaste and their edge runtime compatibility.
+
+## Core Dependencies
+
+### ID Generation
+
+- **nanoid** (v5.1.5) - Secure, URL-safe unique ID generator
+  - ✅ Edge compatible
+  - Used for generating unique gist IDs
+  - Generates 21-character IDs by default
+
+### Code Editor
+
+- **CodeMirror 6** - Modern code editor framework
+  - ✅ Edge compatible (when using state-only features)
+  - Core packages:
+    - `codemirror` - Core editor framework
+    - `@codemirror/state` - Editor state management
+    - `@codemirror/view` - Editor view (use carefully in edge runtime)
+
+### Language Support
+
+Installed language modes for syntax highlighting:
+
+- `@codemirror/lang-javascript` - JavaScript/TypeScript
+- `@codemirror/lang-python` - Python
+- `@codemirror/lang-html` - HTML
+- `@codemirror/lang-css` - CSS
+- `@codemirror/lang-json` - JSON
+- `@codemirror/lang-markdown` - Markdown
+- `@codemirror/lang-sql` - SQL
+- `@codemirror/lang-xml` - XML
+- `@codemirror/lang-yaml` - YAML
+
+### Themes
+
+- `@codemirror/theme-one-dark` - One Dark theme
+- `@uiw/codemirror-theme-github` - GitHub light/dark themes
+
+### UI Framework
+
+- **shadcn/ui** - Component library built on Radix UI
+  - `@radix-ui/react-slot` - Composition primitive
+  - `class-variance-authority` - Variant styling
+  - `clsx` - Class name utility
+  - `tailwind-merge` - Tailwind class merging
+  - `lucide-react` - Icon library
+
+### Theme Management
+
+- **next-themes** - Theme switching for Next.js
+  - ✅ Edge compatible
+  - Handles dark/light mode with system preference support
+
+### Type Definitions
+
+- **@cloudflare/workers-types** - TypeScript types for Cloudflare Workers
+  - Provides types for R2, KV, Durable Objects, etc.
+
+## Edge Runtime Compatibility
+
+All core dependencies have been tested and verified to work in Cloudflare Workers edge runtime:
+
+1. **nanoid** - Fully compatible, uses Web Crypto API
+2. **CodeMirror** - State management is compatible, DOM operations should be client-side only
+3. **UI libraries** - React components work in SSR/edge runtime
+4. **Type definitions** - Development only, no runtime impact
+
+## Usage Notes
+
+### CodeMirror in Edge Runtime
+
+When using CodeMirror in edge runtime (SSR), only use state-related features:
+
+```typescript
+// ✅ Safe for edge runtime
+import { EditorState } from "@codemirror/state";
+const state = EditorState.create({ doc: "code" });
+
+// ❌ Not safe for edge runtime (requires DOM)
+import { EditorView } from "@codemirror/view";
+// Only use EditorView on client-side
+```
+
+### nanoid Usage
+
+```typescript
+import { nanoid } from "nanoid";
+const id = nanoid(); // Generates 21-char ID
+const customId = nanoid(10); // Custom length
+```
+
+## Bundle Size Considerations
+
+- CodeMirror language modes are modular - only import what you need
+- Consider dynamic imports for large language modes
+- Tree-shaking will remove unused exports
diff --git a/docs/TODO.md b/docs/TODO.md
index 05184b3..06876a0 100644
--- a/docs/TODO.md
+++ b/docs/TODO.md
@@ -22,8 +22,8 @@ This document tracks the implementation progress of GhostPaste. Check off tasks
 - [x] Install @cloudflare/next-on-pages for Workers deployment - [#6](https://github.com/nullcoder/ghostpaste/issues/6)
 - [x] Install wrangler for local development - [#6](https://github.com/nullcoder/ghostpaste/issues/6)
 - [x] Install and configure shadcn/ui (using official CLI) - [#8](https://github.com/nullcoder/ghostpaste/issues/8)
-- [ ] Install CodeMirror 6 and language modes - [#9](https://github.com/nullcoder/ghostpaste/issues/9)
-- [ ] Install nanoid for ID generation - [#9](https://github.com/nullcoder/ghostpaste/issues/9)
+- [x] Install CodeMirror 6 and language modes - [#9](https://github.com/nullcoder/ghostpaste/issues/9)
+- [x] Install nanoid for ID generation - [#9](https://github.com/nullcoder/ghostpaste/issues/9)
 - [x] Install @cloudflare/workers-types for type definitions - [#9](https://github.com/nullcoder/ghostpaste/issues/9)
 - [ ] Install development dependencies (vitest, @testing-library/react) - [#10](https://github.com/nullcoder/ghostpaste/issues/10)
 - [x] Install next-themes for theme management - [#8](https://github.com/nullcoder/ghostpaste/issues/8)
diff --git a/package-lock.json b/package-lock.json
index d51bae6..340e188 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,10 +8,23 @@
       "name": "ghostpaste",
       "version": "0.1.0",
       "dependencies": {
+        "@codemirror/lang-css": "^6.3.1",
+        "@codemirror/lang-html": "^6.4.9",
+        "@codemirror/lang-javascript": "^6.2.4",
+        "@codemirror/lang-json": "^6.0.1",
+        "@codemirror/lang-markdown": "^6.3.2",
+        "@codemirror/lang-python": "^6.2.1",
+        "@codemirror/lang-sql": "^6.9.0",
+        "@codemirror/lang-xml": "^6.1.0",
+        "@codemirror/lang-yaml": "^6.1.2",
+        "@codemirror/theme-one-dark": "^6.1.2",
         "@radix-ui/react-slot": "^1.2.3",
+        "@uiw/codemirror-theme-github": "^4.23.12",
         "class-variance-authority": "^0.7.1",
         "clsx": "^2.1.1",
+        "codemirror": "^6.0.1",
         "lucide-react": "^0.513.0",
+        "nanoid": "^5.1.5",
         "next": "15.3.3",
         "next-themes": "^0.4.6",
         "react": "^19.0.0",
@@ -8067,6 +8080,225 @@
       "dev": true,
       "license": "MIT OR Apache-2.0"
     },
+    "node_modules/@codemirror/autocomplete": {
+      "version": "6.18.6",
+      "resolved": "https://registry.npmjs.org/@codemirror/autocomplete/-/autocomplete-6.18.6.tgz",
+      "integrity": "sha512-PHHBXFomUs5DF+9tCOM/UoW6XQ4R44lLNNhRaW9PKPTU0D7lIjRg3ElxaJnTwsl/oHiR93WSXDBrekhoUGCPtg==",
+      "license": "MIT",
+      "dependencies": {
+        "@codemirror/language": "^6.0.0",
+        "@codemirror/state": "^6.0.0",
+        "@codemirror/view": "^6.17.0",
+        "@lezer/common": "^1.0.0"
+      }
+    },
+    "node_modules/@codemirror/commands": {
+      "version": "6.8.1",
+      "resolved": "https://registry.npmjs.org/@codemirror/commands/-/commands-6.8.1.tgz",
+      "integrity": "sha512-KlGVYufHMQzxbdQONiLyGQDUW0itrLZwq3CcY7xpv9ZLRHqzkBSoteocBHtMCoY7/Ci4xhzSrToIeLg7FxHuaw==",
+      "license": "MIT",
+      "dependencies": {
+        "@codemirror/language": "^6.0.0",
+        "@codemirror/state": "^6.4.0",
+        "@codemirror/view": "^6.27.0",
+        "@lezer/common": "^1.1.0"
+      }
+    },
+    "node_modules/@codemirror/lang-css": {
+      "version": "6.3.1",
+      "resolved": "https://registry.npmjs.org/@codemirror/lang-css/-/lang-css-6.3.1.tgz",
+      "integrity": "sha512-kr5fwBGiGtmz6l0LSJIbno9QrifNMUusivHbnA1H6Dmqy4HZFte3UAICix1VuKo0lMPKQr2rqB+0BkKi/S3Ejg==",
+      "license": "MIT",
+      "dependencies": {
+        "@codemirror/autocomplete": "^6.0.0",
+        "@codemirror/language": "^6.0.0",
+        "@codemirror/state": "^6.0.0",
+        "@lezer/common": "^1.0.2",
+        "@lezer/css": "^1.1.7"
+      }
+    },
+    "node_modules/@codemirror/lang-html": {
+      "version": "6.4.9",
+      "resolved": "https://registry.npmjs.org/@codemirror/lang-html/-/lang-html-6.4.9.tgz",
+      "integrity": "sha512-aQv37pIMSlueybId/2PVSP6NPnmurFDVmZwzc7jszd2KAF8qd4VBbvNYPXWQq90WIARjsdVkPbw29pszmHws3Q==",
+      "license": "MIT",
+      "dependencies": {
+        "@codemirror/autocomplete": "^6.0.0",
+        "@codemirror/lang-css": "^6.0.0",
+        "@codemirror/lang-javascript": "^6.0.0",
+        "@codemirror/language": "^6.4.0",
+        "@codemirror/state": "^6.0.0",
+        "@codemirror/view": "^6.17.0",
+        "@lezer/common": "^1.0.0",
+        "@lezer/css": "^1.1.0",
+        "@lezer/html": "^1.3.0"
+      }
+    },
+    "node_modules/@codemirror/lang-javascript": {
+      "version": "6.2.4",
+      "resolved": "https://registry.npmjs.org/@codemirror/lang-javascript/-/lang-javascript-6.2.4.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "@codemirror/autocomplete": "^6.0.0",
+        "@codemirror/language": "^6.6.0",
+        "@codemirror/lint": "^6.0.0",
+        "@codemirror/state": "^6.0.0",
+        "@codemirror/view": "^6.17.0",
+        "@lezer/common": "^1.0.0",
+        "@lezer/javascript": "^1.0.0"
+      }
+    },
+    "node_modules/@codemirror/lang-json": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/@codemirror/lang-json/-/lang-json-6.0.1.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+        "@lezer/json": "^1.0.0"
+      }
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+      "version": "6.3.2",
+      "resolved": "https://registry.npmjs.org/@codemirror/lang-markdown/-/lang-markdown-6.3.2.tgz",
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+      "dependencies": {
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+        "@codemirror/lang-html": "^6.0.0",
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+        "@codemirror/state": "^6.0.0",
+        "@codemirror/view": "^6.0.0",
+        "@lezer/common": "^1.2.1",
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+      "version": "6.2.1",
+      "resolved": "https://registry.npmjs.org/@codemirror/lang-python/-/lang-python-6.2.1.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+        "@codemirror/language": "^6.8.0",
+        "@codemirror/state": "^6.0.0",
+        "@lezer/common": "^1.2.1",
+        "@lezer/python": "^1.1.4"
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+    },
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+      "version": "6.9.0",
+      "resolved": "https://registry.npmjs.org/@codemirror/lang-sql/-/lang-sql-6.9.0.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "@codemirror/autocomplete": "^6.0.0",
+        "@codemirror/language": "^6.0.0",
+        "@codemirror/state": "^6.0.0",
+        "@lezer/common": "^1.2.0",
+        "@lezer/highlight": "^1.0.0",
+        "@lezer/lr": "^1.0.0"
+      }
+    },
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+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/@codemirror/lang-xml/-/lang-xml-6.1.0.tgz",
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+        "@codemirror/view": "^6.0.0",
+        "@lezer/common": "^1.0.0",
+        "@lezer/xml": "^1.0.0"
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+        "@lezer/yaml": "^1.0.0"
+      }
+    },
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+      "resolved": "https://registry.npmjs.org/@codemirror/language/-/language-6.11.1.tgz",
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+        "@lezer/common": "^1.1.0",
+        "@lezer/highlight": "^1.0.0",
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+      }
+    },
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+        "crelt": "^1.0.5"
+      }
+    },
+    "node_modules/@codemirror/search": {
+      "version": "6.5.11",
+      "resolved": "https://registry.npmjs.org/@codemirror/search/-/search-6.5.11.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "@codemirror/state": "^6.0.0",
+        "@codemirror/view": "^6.0.0",
+        "crelt": "^1.0.5"
+      }
+    },
+    "node_modules/@codemirror/state": {
+      "version": "6.5.2",
+      "resolved": "https://registry.npmjs.org/@codemirror/state/-/state-6.5.2.tgz",
+      "integrity": "sha512-FVqsPqtPWKVVL3dPSxy8wEF/ymIEuVzF1PK3VbUgrxXpJUSHQWWZz4JMToquRxnkw+36LTamCZG2iua2Ptq0fA==",
+      "license": "MIT",
+      "dependencies": {
+        "@marijn/find-cluster-break": "^1.0.0"
+      }
+    },
+    "node_modules/@codemirror/theme-one-dark": {
+      "version": "6.1.2",
+      "resolved": "https://registry.npmjs.org/@codemirror/theme-one-dark/-/theme-one-dark-6.1.2.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "@codemirror/language": "^6.0.0",
+        "@codemirror/state": "^6.0.0",
+        "@codemirror/view": "^6.0.0",
+        "@lezer/highlight": "^1.0.0"
+      }
+    },
+    "node_modules/@codemirror/view": {
+      "version": "6.37.1",
+      "resolved": "https://registry.npmjs.org/@codemirror/view/-/view-6.37.1.tgz",
+      "integrity": "sha512-Qy4CAUwngy/VQkEz0XzMKVRcckQuqLYWKqVpDDDghBe5FSXSqfVrJn49nw3ePZHxRUz4nRmb05Lgi+9csWo4eg==",
+      "license": "MIT",
+      "dependencies": {
+        "@codemirror/state": "^6.5.0",
+        "crelt": "^1.0.6",
+        "style-mod": "^4.1.0",
+        "w3c-keyname": "^2.2.4"
+      }
+    },
     "node_modules/@cspotcode/source-map-support": {
       "version": "0.8.1",
       "resolved": "https://registry.npmjs.org/@cspotcode/source-map-support/-/source-map-support-0.8.1.tgz",
@@ -9380,6 +9612,123 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
+    "node_modules/@lezer/common": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/@lezer/common/-/common-1.2.3.tgz",
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+      "license": "MIT"
+    },
+    "node_modules/@lezer/css": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/@lezer/css/-/css-1.2.1.tgz",
+      "integrity": "sha512-2F5tOqzKEKbCUNraIXc0f6HKeyKlmMWJnBB0i4XW6dJgssrZO/YlZ2pY5xgyqDleqqhiNJ3dQhbrV2aClZQMvg==",
+      "license": "MIT",
+      "dependencies": {
+        "@lezer/common": "^1.2.0",
+        "@lezer/highlight": "^1.0.0",
+        "@lezer/lr": "^1.3.0"
+      }
+    },
+    "node_modules/@lezer/highlight": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/@lezer/highlight/-/highlight-1.2.1.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "@lezer/common": "^1.0.0"
+      }
+    },
+    "node_modules/@lezer/html": {
+      "version": "1.3.10",
+      "resolved": "https://registry.npmjs.org/@lezer/html/-/html-1.3.10.tgz",
+      "integrity": "sha512-dqpT8nISx/p9Do3AchvYGV3qYc4/rKr3IBZxlHmpIKam56P47RSHkSF5f13Vu9hebS1jM0HmtJIwLbWz1VIY6w==",
+      "license": "MIT",
+      "dependencies": {
+        "@lezer/common": "^1.2.0",
+        "@lezer/highlight": "^1.0.0",
+        "@lezer/lr": "^1.0.0"
+      }
+    },
+    "node_modules/@lezer/javascript": {
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/@lezer/javascript/-/javascript-1.5.1.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "@lezer/common": "^1.2.0",
+        "@lezer/highlight": "^1.1.3",
+        "@lezer/lr": "^1.3.0"
+      }
+    },
+    "node_modules/@lezer/json": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/@lezer/json/-/json-1.0.3.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "@lezer/common": "^1.2.0",
+        "@lezer/highlight": "^1.0.0",
+        "@lezer/lr": "^1.0.0"
+      }
+    },
+    "node_modules/@lezer/lr": {
+      "version": "1.4.2",
+      "resolved": "https://registry.npmjs.org/@lezer/lr/-/lr-1.4.2.tgz",
+      "integrity": "sha512-pu0K1jCIdnQ12aWNaAVU5bzi7Bd1w54J3ECgANPmYLtQKP0HBj2cE/5coBD66MT10xbtIuUr7tg0Shbsvk0mDA==",
+      "license": "MIT",
+      "dependencies": {
+        "@lezer/common": "^1.0.0"
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+        "@lezer/highlight": "^1.0.0",
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@@ -12028,6 +12377,37 @@
         "url": "https://opencollective.com/typescript-eslint"
       }
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+    "node_modules/@uiw/codemirror-theme-github": {
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+      "resolved": "https://registry.npmjs.org/@uiw/codemirror-theme-github/-/codemirror-theme-github-4.23.12.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+      },
+      "funding": {
+        "url": "https://jaywcjlove.github.io/#/sponsor"
+      }
+    },
+    "node_modules/@uiw/codemirror-themes": {
+      "version": "4.23.12",
+      "resolved": "https://registry.npmjs.org/@uiw/codemirror-themes/-/codemirror-themes-4.23.12.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+        "@codemirror/state": "^6.0.0",
+        "@codemirror/view": "^6.0.0"
+      },
+      "funding": {
+        "url": "https://jaywcjlove.github.io/#/sponsor"
+      },
+      "peerDependencies": {
+        "@codemirror/language": ">=6.0.0",
+        "@codemirror/state": ">=6.0.0",
+        "@codemirror/view": ">=6.0.0"
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     "node_modules/@unrs/resolver-binding-darwin-arm64": {
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@@ -12963,6 +13343,21 @@
         "node": ">=6"
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+    "node_modules/codemirror": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/codemirror/-/codemirror-6.0.1.tgz",
+      "integrity": "sha512-J8j+nZ+CdWmIeFIGXEFbFPtpiYacFMDR8GlHK3IyHQJMCaVRfGx9NT+Hxivv1ckLWPvNdZqndbr/7lVhrf/Svg==",
+      "license": "MIT",
+      "dependencies": {
+        "@codemirror/autocomplete": "^6.0.0",
+        "@codemirror/commands": "^6.0.0",
+        "@codemirror/language": "^6.0.0",
+        "@codemirror/lint": "^6.0.0",
+        "@codemirror/search": "^6.0.0",
+        "@codemirror/state": "^6.0.0",
+        "@codemirror/view": "^6.0.0"
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       "resolved": "https://registry.npmjs.org/color/-/color-4.2.3.tgz",
@@ -13075,6 +13470,12 @@
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+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/crelt/-/crelt-1.0.6.tgz",
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+      "license": "MIT"
+    },
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@@ -13094,7 +13495,7 @@
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-      "dev": true,
+      "devOptional": true,
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@@ -16420,9 +16821,9 @@
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+      "version": "5.1.5",
+      "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-5.1.5.tgz",
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@@ -16431,10 +16832,10 @@
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       "license": "MIT",
       "bin": {
-        "nanoid": "bin/nanoid.cjs"
+        "nanoid": "bin/nanoid.js"
       },
       "engines": {
-        "node": "^10 || ^12 || ^13.7 || ^14 || >=15.0.1"
+        "node": "^18 || >=20"
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@@ -16534,6 +16935,24 @@
         "react-dom": "^16.8 || ^17 || ^18 || ^19 || ^19.0.0-rc"
       }
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+    "node_modules/next/node_modules/nanoid": {
+      "version": "3.3.11",
+      "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.11.tgz",
+      "integrity": "sha512-N8SpfPUnUp1bK+PMYW8qSWdl9U+wwNWI4QKxOYDy9JAro3WMX7p2OeVRF9v+347pnakNevPmiHhNmZ2HbFA76w==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/ai"
+        }
+      ],
+      "license": "MIT",
+      "bin": {
+        "nanoid": "bin/nanoid.cjs"
+      },
+      "engines": {
+        "node": "^10 || ^12 || ^13.7 || ^14 || >=15.0.1"
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@@ -16988,6 +17407,25 @@
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+    "node_modules/postcss/node_modules/nanoid": {
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+      "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.11.tgz",
+      "integrity": "sha512-N8SpfPUnUp1bK+PMYW8qSWdl9U+wwNWI4QKxOYDy9JAro3WMX7p2OeVRF9v+347pnakNevPmiHhNmZ2HbFA76w==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/ai"
+        }
+      ],
+      "license": "MIT",
+      "bin": {
+        "nanoid": "bin/nanoid.cjs"
+      },
+      "engines": {
+        "node": "^10 || ^12 || ^13.7 || ^14 || >=15.0.1"
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@@ -18182,6 +18620,12 @@
       ],
       "license": "MIT"
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+      "resolved": "https://registry.npmjs.org/style-mod/-/style-mod-4.1.2.tgz",
+      "integrity": "sha512-wnD1HyVqpJUI2+eKZ+eo1UwghftP6yuFheBqqe+bWCotBjC2K1YnteJILRMs3SM4V/0dLEW1SC27MWP5y+mwmw==",
+      "license": "MIT"
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@@ -18693,6 +19137,12 @@
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+    "node_modules/w3c-keyname": {
+      "version": "2.2.8",
+      "resolved": "https://registry.npmjs.org/w3c-keyname/-/w3c-keyname-2.2.8.tgz",
+      "integrity": "sha512-dpojBhNsCNN7T82Tm7k26A6G9ML3NkhDsnw9n/eoxSRlVBB4CEtIQ/KTCLI2Fwf3ataSXRhYFkQi3SlnFwPvPQ==",
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diff --git a/package.json b/package.json
index 6078528..1e68748 100644
--- a/package.json
+++ b/package.json
@@ -17,10 +17,23 @@
     "prepare": "husky"
   },
   "dependencies": {
+    "@codemirror/lang-css": "^6.3.1",
+    "@codemirror/lang-html": "^6.4.9",
+    "@codemirror/lang-javascript": "^6.2.4",
+    "@codemirror/lang-json": "^6.0.1",
+    "@codemirror/lang-markdown": "^6.3.2",
+    "@codemirror/lang-python": "^6.2.1",
+    "@codemirror/lang-sql": "^6.9.0",
+    "@codemirror/lang-xml": "^6.1.0",
+    "@codemirror/lang-yaml": "^6.1.2",
+    "@codemirror/theme-one-dark": "^6.1.2",
     "@radix-ui/react-slot": "^1.2.3",
+    "@uiw/codemirror-theme-github": "^4.23.12",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
+    "codemirror": "^6.0.1",
     "lucide-react": "^0.513.0",
+    "nanoid": "^5.1.5",
     "next": "15.3.3",
     "next-themes": "^0.4.6",
     "react": "^19.0.0",