diff --git a/backend/main.py b/backend/main.py
index dab5cff..0739cbb 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -527,7 +527,14 @@ async def api_file(vault_name: str, path: str = Query(..., description="Relative
     if not file_path.exists() or not file_path.is_file():
         raise HTTPException(status_code=404, detail=f"File not found: {path}")
 
-    raw = file_path.read_text(encoding="utf-8", errors="replace")
+    try:
+        raw = file_path.read_text(encoding="utf-8", errors="replace")
+    except PermissionError:
+        raise HTTPException(status_code=403, detail=f"Permission denied: cannot read file {path}")
+    except Exception as e:
+        logger.error(f"Error reading file {path}: {e}")
+        raise HTTPException(status_code=500, detail=f"Error reading file: {str(e)}")
+    
     ext = file_path.suffix.lower()
 
     if ext == ".md":
diff --git a/frontend/app.js b/frontend/app.js
index fb531f0..50efa53 100644
--- a/frontend/app.js
+++ b/frontend/app.js
@@ -1203,16 +1203,25 @@
     });
 
     // Action buttons
-    const copyBtn = el("button", { class: "btn-action", title: "Copier le chemin" }, [
+    const copyBtn = el("button", { class: "btn-action", title: "Copier la source" }, [
       icon("copy", 14),
       document.createTextNode("Copier"),
     ]);
-    copyBtn.addEventListener("click", () => {
-      navigator.clipboard.writeText(`${data.vault}/${data.path}`).then(() => {
-        copyBtn.querySelector("span") || (copyBtn.lastChild.textContent = "Copié !");
+    copyBtn.addEventListener("click", async () => {
+      try {
+        // Fetch raw content if not already cached
+        if (!cachedRawSource) {
+          const rawUrl = `/api/file/${encodeURIComponent(data.vault)}/raw?path=${encodeURIComponent(data.path)}`;
+          const rawData = await api(rawUrl);
+          cachedRawSource = rawData.raw;
+        }
+        await navigator.clipboard.writeText(cachedRawSource);
         copyBtn.lastChild.textContent = "Copié !";
         setTimeout(() => (copyBtn.lastChild.textContent = "Copier"), 1500);
-      });
+      } catch (err) {
+        console.error("Copy error:", err);
+        showToast("Erreur lors de la copie");
+      }
     });
 
     const sourceBtn = el("button", { class: "btn-action", title: "Voir la source" }, [
@@ -1903,12 +1912,13 @@
     try {
       await waitForCodeMirror();
 
-      const { EditorView, EditorState, basicSetup, markdown, oneDark, keymap } = window.CodeMirror;
+      const { EditorView, EditorState, basicSetup, markdown, python, javascript, html, css, json, xml, sql, php, cpp, java, rust, oneDark, keymap } = window.CodeMirror;
 
       const currentTheme = document.documentElement.getAttribute("data-theme");
+      const fileExt = filePath.split(".").pop().toLowerCase();
+      
       const extensions = [
         basicSetup,
-        markdown(),
         keymap.of([{
           key: "Mod-s",
           run: () => {
@@ -1919,6 +1929,45 @@
         EditorView.lineWrapping,
       ];
 
+      // Add language support based on file extension
+      const langMap = {
+        "md": markdown,
+        "markdown": markdown,
+        "py": python,
+        "js": javascript,
+        "jsx": javascript,
+        "ts": javascript,
+        "tsx": javascript,
+        "mjs": javascript,
+        "cjs": javascript,
+        "html": html,
+        "htm": html,
+        "css": css,
+        "scss": css,
+        "less": css,
+        "json": json,
+        "xml": xml,
+        "svg": xml,
+        "sql": sql,
+        "php": php,
+        "cpp": cpp,
+        "cc": cpp,
+        "cxx": cpp,
+        "c": cpp,
+        "h": cpp,
+        "hpp": cpp,
+        "java": java,
+        "rs": rust,
+        "sh": javascript, // Using javascript for shell scripts as fallback
+        "bash": javascript,
+        "zsh": javascript,
+      };
+
+      const langMode = langMap[fileExt];
+      if (langMode) {
+        extensions.push(langMode());
+      }
+
       if (currentTheme === "dark") {
         extensions.push(oneDark);
       }
diff --git a/frontend/index.html b/frontend/index.html
index c3d1a61..5521d28 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -26,6 +26,17 @@
     import { searchKeymap, highlightSelectionMatches } from "https://esm.sh/@codemirror/search@6.3.0?external=@codemirror/state";
     import { autocompletion, completionKeymap, closeBrackets, closeBracketsKeymap } from "https://esm.sh/@codemirror/autocomplete@6.5.0?external=@codemirror/state";
     import { markdown } from "https://esm.sh/@codemirror/lang-markdown@6.1.0?external=@codemirror/state";
+    import { python } from "https://esm.sh/@codemirror/lang-python@6.1.3?external=@codemirror/state";
+    import { javascript } from "https://esm.sh/@codemirror/lang-javascript@6.1.7?external=@codemirror/state";
+    import { html } from "https://esm.sh/@codemirror/lang-html@6.4.3?external=@codemirror/state";
+    import { css } from "https://esm.sh/@codemirror/lang-css@6.2.0?external=@codemirror/state";
+    import { json } from "https://esm.sh/@codemirror/lang-json@6.0.1?external=@codemirror/state";
+    import { xml } from "https://esm.sh/@codemirror/lang-xml@6.0.2?external=@codemirror/state";
+    import { sql } from "https://esm.sh/@codemirror/lang-sql@6.5.0?external=@codemirror/state";
+    import { php } from "https://esm.sh/@codemirror/lang-php@6.0.1?external=@codemirror/state";
+    import { cpp } from "https://esm.sh/@codemirror/lang-cpp@6.0.2?external=@codemirror/state";
+    import { java } from "https://esm.sh/@codemirror/lang-java@6.0.1?external=@codemirror/state";
+    import { rust } from "https://esm.sh/@codemirror/lang-rust@6.0.1?external=@codemirror/state";
     import { oneDark } from "https://esm.sh/@codemirror/theme-one-dark@6.1.0?external=@codemirror/state";
     
     const basicSetup = [
@@ -56,7 +67,7 @@
       ])
     ];
     
-    window.CodeMirror = { EditorView, EditorState, basicSetup, markdown, oneDark, keymap };
+    window.CodeMirror = { EditorView, EditorState, basicSetup, markdown, python, javascript, html, css, json, xml, sql, php, cpp, java, rust, oneDark, keymap };
   </script>
 </head>
 <body>