diff --git a/src/lib/data/import-metadata/utils.ts b/src/lib/data/import-metadata/utils.ts
index daac9b1a..6efed71f 100644
--- a/src/lib/data/import-metadata/utils.ts
+++ b/src/lib/data/import-metadata/utils.ts
@@ -57,7 +57,7 @@ export const fixMetadataJson = (metadataJson: string): string => {
 
             /* eslint-disable-next-line no-useless-escape */
             .replace(/\"/g, '___ESCAPED_QUOTE___') // Temporarily replace empty strings
-            .replace(/(?<=:\s*)""(?=\s*[,}])/g, '___EMPTY___') // Temporarily replace empty strings
+            .replace(/(:\s*)""(?=\s*[,}])/g, '$1___EMPTY___') // Temporarily replace empty strings (Safari-compatible)
             .replace(/""/g, '"') // Replace remaining double quotes
             .replace(/___ESCAPED_QUOTE___/g, '"') // Restore empty strings
             .replace(/___EMPTY___/g, '""') // Restore empty strings
diff --git a/src/main.tsx b/src/main.tsx
index c0884698..eaf62656 100644
--- a/src/main.tsx
+++ b/src/main.tsx
@@ -1,3 +1,6 @@
+// Polyfills must be imported first for Safari compatibility
+import './polyfills';
+
 import React from 'react';
 import ReactDOM from 'react-dom/client';
 import './index.css';
diff --git a/src/pages/editor-page/canvas/note-node/note-node.tsx b/src/pages/editor-page/canvas/note-node/note-node.tsx
index c48cfe73..9671ddb6 100644
--- a/src/pages/editor-page/canvas/note-node/note-node.tsx
+++ b/src/pages/editor-page/canvas/note-node/note-node.tsx
@@ -13,6 +13,7 @@ import { useTheme } from '@/hooks/use-theme';
 import ReactMarkdown from 'react-markdown';
 import remarkGfm from 'remark-gfm';
 import rehypeRaw from 'rehype-raw';
+import { getIsOldSafari } from '@/safari-compat';
 
 export interface NoteNodeProps extends NodeProps {
     data: {
@@ -193,7 +194,9 @@ export const NoteNode: React.FC<NoteNodeProps> = ({
                     <div className="h-full overflow-auto break-words text-sm leading-relaxed text-gray-700 dark:text-gray-300">
                         {note.content ? (
                             <ReactMarkdown
-                                remarkPlugins={[remarkGfm]}
+                                remarkPlugins={
+                                    getIsOldSafari() ? [] : [remarkGfm]
+                                }
                                 rehypePlugins={[rehypeRaw]}
                                 components={{
                                     h1: (props) => (
diff --git a/src/polyfills.ts b/src/polyfills.ts
new file mode 100644
index 00000000..b4ea58eb
--- /dev/null
+++ b/src/polyfills.ts
@@ -0,0 +1,55 @@
+/**
+ * Polyfills for Safari compatibility
+ * Safari 15.3 and earlier don't support these modern JavaScript features
+ */
+
+// Polyfill for structuredClone (Safari < 15.4)
+if (typeof globalThis.structuredClone === 'undefined') {
+    globalThis.structuredClone = <T>(obj: T): T => {
+        // For simple cases, use JSON parse/stringify
+        // This doesn't handle all edge cases (like circular refs, Map, Set, etc.)
+        // but works for most common use cases
+        if (obj === undefined) return undefined as T;
+        if (obj === null) return null as T;
+
+        try {
+            return JSON.parse(JSON.stringify(obj));
+        } catch {
+            // Fallback for objects that can't be JSON serialized
+            return obj;
+        }
+    };
+}
+
+// Polyfill for Array.prototype.at (Safari < 15.4)
+if (!Array.prototype.at) {
+    Array.prototype.at = function <T>(this: T[], index: number): T | undefined {
+        const length = this.length;
+        const relativeIndex = index >= 0 ? index : length + index;
+        if (relativeIndex < 0 || relativeIndex >= length) {
+            return undefined;
+        }
+        return this[relativeIndex];
+    };
+}
+
+// Polyfill for String.prototype.at (Safari < 15.4)
+if (!String.prototype.at) {
+    String.prototype.at = function (index: number): string | undefined {
+        const length = this.length;
+        const relativeIndex = index >= 0 ? index : length + index;
+        if (relativeIndex < 0 || relativeIndex >= length) {
+            return undefined;
+        }
+        return this[relativeIndex];
+    };
+}
+
+// Polyfill for Object.hasOwn (Safari < 15.4)
+if (!Object.hasOwn) {
+    Object.hasOwn = function (obj: object, prop: PropertyKey): boolean {
+        return Object.prototype.hasOwnProperty.call(obj, prop);
+    };
+}
+
+export {};
diff --git a/src/safari-compat.ts b/src/safari-compat.ts
new file mode 100644
index 00000000..eddeb581
--- /dev/null
+++ b/src/safari-compat.ts
@@ -0,0 +1,48 @@
+/**
+ * Safari compatibility utilities
+ */
+
+/**
+ * Detect if the current browser is Safari
+ */
+const isSafari = (): boolean => {
+    if (typeof window === 'undefined' || typeof navigator === 'undefined') {
+        return false;
+    }
+
+    const ua = navigator.userAgent;
+    // Safari but not Chrome (Chrome UA also contains "Safari")
+    return (
+        ua.includes('Safari') &&
+        !ua.includes('Chrome') &&
+        !ua.includes('Chromium')
+    );
+};
+
+/**
+ * Test if the browser supports the regex features used by remark-gfm.
+ * remark-gfm uses unicode property escapes (\p{P}) which older Safari
+ * misinterprets as named capture groups, throwing "invalid group specifier name"
+ */
+const hasRemarkGfmRegexIssue = (): boolean => {
+    try {
+        // Test the pattern remark-gfm uses in transformGfmAutolinkLiterals
+        new RegExp('(?<=\\p{P})a', 'u');
+        return false; // Regex works fine
+    } catch {
+        return true; // Regex throws error
+    }
+};
+
+/**
+ * Returns true if remarkGfm should be disabled.
+ * Only disables for Safari browsers that have the regex issue.
+ */
+let shouldDisableCached: boolean | null = null;
+
+export const getIsOldSafari = (): boolean => {
+    if (shouldDisableCached === null) {
+        shouldDisableCached = isSafari() && hasRemarkGfmRegexIssue();
+    }
+    return shouldDisableCached;
+};