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+<!-- ═══════════════ HMAC GENERATOR ═══════════════ -->
+<div class="page" id="page-hmac">
+  <button class="back-btn" onclick="showPage('home')">← Back to Tools</button>
+  <div class="section-header">
+    <h2><i class="fas fa-lock" style="color:var(--red)"></i> HMAC Generator</h2>
+    <p>Generate HMAC signatures from a message and secret key.</p>
+  </div>
+  <div style="max-width:720px;">
+    <div class="panel-label">Message</div>
+    <textarea id="hmacMessage" placeholder="Enter message to sign..." style="min-height:80px;"></textarea>
+    <div class="panel-label" style="margin-top:12px;">Secret Key</div>
+    <input type="text" id="hmacSecret" placeholder="Enter your secret key..." />
+    <div style="display:flex;align-items:center;gap:10px;margin-top:10px;">
+      <label style="font-size:0.8rem;color:var(--text-secondary);">Algorithm:</label>
+      <select id="hmacAlgo" style="width:140px;padding:6px 10px;">
+        <option value="sha256" selected>SHA-256</option>
+        <option value="sha512">SHA-512</option>
+        <option value="sha1">SHA-1</option>
+        <option value="md5">MD5</option>
+      </select>
+    </div>
+    <div class="btn-group">
+      <button class="btn btn-primary" onclick="generateHmac()"><i class="fas fa-lock"></i> Generate HMAC</button>
+    </div>
+    <div id="hmacResults"></div>
+    <div class="status" id="hmacStatus"></div>
+    <div class="api-usage">
+      <button class="api-usage-toggle" onclick="toggleApiUsage(this)"><span><i class="fas fa-terminal"></i> API Usage <span class="badge">REST</span></span><i class="fas fa-chevron-down"></i></button>
+      <div class="api-usage-body">
+        <div class="api-baseurl-note">All examples use <code>BASE_URL</code> — set it to your deployment URL.</div>
+        <div class="api-endpoint">
+          <span class="api-method post">POST</span><span class="api-path">/api/hmac</span>
+          <div class="api-desc">Generate an HMAC signature. Supports sha256, sha512, sha1, md5.</div>
+          <div class="api-code"><button class="api-code-copy" onclick="copyApiCode(this)">Copy</button><span class="kw">const</span> res = <span class="kw">await</span> <span class="fn">fetch</span>(<span class="var">`${BASE_URL}/api/hmac`</span>, {
+  method: <span class="str">"POST"</span>,
+  headers: { <span class="str">"Content-Type"</span>: <span class="str">"application/json"</span> },
+  body: JSON.<span class="fn">stringify</span>({
+    message: <span class="str">"hello world"</span>,
+    secret: <span class="str">"my-secret-key"</span>,
+    algorithm: <span class="str">"sha256"</span>
+  })
+});
+<span class="cm">// → { success: true, hmac: "734c...", algorithm: "sha256" }</span></div>
+        </div>
+      </div>
+    </div>
+  </div>
+</div>
+