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auth.js

@@ -0,0 +1,23 @@
+document.addEventListener('DOMContentLoaded', () => {
+  const form = document.getElementById('auth-form');
+  const errorEl = document.getElementById('auth-error');
+  const isRegister = document.body.dataset.page === 'register';
+
+  form.addEventListener('submit', async (e) => {
+    e.preventDefault();
+    errorEl.textContent = '';
+    const email = document.getElementById('email').value.trim();
+    const password = document.getElementById('password').value;
+    const endpoint = isRegister ? '/api/auth/register' : '/api/auth/login';
+
+    try {
+      await API.request(endpoint, {
+        method: 'POST',
+        body: JSON.stringify({ email, password }),
+      });
+      window.location.href = '/';
+    } catch (err) {
+      errorEl.textContent = err.message;
+    }
+  });
+});