diff --git a/src/pages/contacto.astro b/src/pages/contacto.astro
index 516ebf6..e6b3a8b 100644
--- a/src/pages/contacto.astro
+++ b/src/pages/contacto.astro
@@ -84,9 +84,13 @@ const reCAPTCHA_site_key = '6LeOxaEaAAAAAPD8rQQLqw4woxn1dMjvF_Ooy0BG';
                 required
                 autocomplete="name"
                 maxlength="100"
+                pattern="[A-Za-záéíóúüñÁÉÍÓÚÜÑçÇ\s]+"
+                inputmode="text"
+                aria-describedby="name-error"
                 class="w-full px-3.5 py-2.5 rounded-md outline-none transition-colors"
                 style="background: var(--hds-bg); color: var(--hds-fg); border: 1px solid var(--hds-line);"
               />
+              <div id="name-error" class="hidden text-xs mt-1" style="color: var(--color-hds-error);" aria-live="polite"></div>
             </div>
 
             <div>
@@ -100,9 +104,11 @@ const reCAPTCHA_site_key = '6LeOxaEaAAAAAPD8rQQLqw4woxn1dMjvF_Ooy0BG';
                 required
                 autocomplete="email"
                 maxlength="200"
+                aria-describedby="email-error"
                 class="w-full px-3.5 py-2.5 rounded-md outline-none transition-colors"
                 style="background: var(--hds-bg); color: var(--hds-fg); border: 1px solid var(--hds-line);"
               />
+              <div id="email-error" class="hidden text-xs mt-1" style="color: var(--color-hds-error);" aria-live="polite"></div>
             </div>
 
             <div>
@@ -153,6 +159,47 @@ const reCAPTCHA_site_key = '6LeOxaEaAAAAAPD8rQQLqw4woxn1dMjvF_Ooy0BG';
       const successMsg = isEn ? 'Message sent. We will reply soon.' : 'Mensaje enviado. Te respondemos pronto.';
       const errorMsg = isEn ? 'Could not send. Please try again or contact us via WhatsApp.' : 'No se pudo enviar. Probá de nuevo o contactanos por WhatsApp.';
 
+      const nameInput = document.getElementById('name');
+      const emailInput = document.getElementById('email');
+      const nameError = document.getElementById('name-error');
+      const emailError = document.getElementById('email-error');
+      const nameRegex = /[^a-záéíóúüñç\s]/gi;
+      const emailRegex = /^[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,}$/;
+      const nameErrMsg = isEn ? 'Letters and spaces only' : 'Solo letras y espacios';
+      const emailErrMsg = isEn ? 'Invalid email address' : 'Dirección de correo no válida';
+
+      function showFieldError(input, errorEl, msg) {
+        errorEl.textContent = msg;
+        errorEl.classList.remove('hidden');
+        input.style.borderColor = 'var(--color-hds-error)';
+      }
+      function clearFieldError(input, errorEl) {
+        errorEl.classList.add('hidden');
+        errorEl.textContent = '';
+        input.style.borderColor = '';
+      }
+
+      nameInput.addEventListener('beforeinput', (e) => {
+        if (e.data && nameRegex.test(e.data)) {
+          e.preventDefault();
+        }
+      });
+      nameInput.addEventListener('input', () => {
+        const clean = nameInput.value.replace(nameRegex, '');
+        if (clean !== nameInput.value) {
+          nameInput.value = clean;
+        }
+      });
+      emailInput.addEventListener('input', () => {
+        emailInput.value = emailInput.value.toLowerCase();
+      });
+      [nameInput, emailInput].forEach(input => {
+        input.addEventListener('focus', () => {
+          const err = document.getElementById(input.id + '-error');
+          if (err) clearFieldError(input, err);
+        });
+      });
+
       window.addEventListener('load', () => {
         if (window.grecaptcha && window.grecaptcha.ready) {
           window.grecaptcha.ready();
@@ -169,6 +216,22 @@ const reCAPTCHA_site_key = '6LeOxaEaAAAAAPD8rQQLqw4woxn1dMjvF_Ooy0BG';
         status.textContent = '';
         status.style.color = 'var(--hds-fg-soft)';
 
+        let hasError = false;
+        if (nameInput.value.trim() && nameRegex.test(nameInput.value)) {
+          showFieldError(nameInput, nameError, nameErrMsg);
+          hasError = true;
+        }
+        const emailVal = emailInput.value.trim();
+        if (emailVal && !emailRegex.test(emailVal)) {
+          showFieldError(emailInput, emailError, emailErrMsg);
+          hasError = true;
+        }
+        if (hasError) {
+          label.textContent = originalLabel;
+          submit.disabled = false;
+          return;
+        }
+
         try {
           let token = '';
           if (window.grecaptcha && window.grecaptcha.execute) {
diff --git a/src/pages/en/contact.astro b/src/pages/en/contact.astro
index 516ebf6..e6b3a8b 100644
--- a/src/pages/en/contact.astro
+++ b/src/pages/en/contact.astro
@@ -84,9 +84,13 @@ const reCAPTCHA_site_key = '6LeOxaEaAAAAAPD8rQQLqw4woxn1dMjvF_Ooy0BG';
                 required
                 autocomplete="name"
                 maxlength="100"
+                pattern="[A-Za-záéíóúüñÁÉÍÓÚÜÑçÇ\s]+"
+                inputmode="text"
+                aria-describedby="name-error"
                 class="w-full px-3.5 py-2.5 rounded-md outline-none transition-colors"
                 style="background: var(--hds-bg); color: var(--hds-fg); border: 1px solid var(--hds-line);"
               />
+              <div id="name-error" class="hidden text-xs mt-1" style="color: var(--color-hds-error);" aria-live="polite"></div>
             </div>
 
             <div>
@@ -100,9 +104,11 @@ const reCAPTCHA_site_key = '6LeOxaEaAAAAAPD8rQQLqw4woxn1dMjvF_Ooy0BG';
                 required
                 autocomplete="email"
                 maxlength="200"
+                aria-describedby="email-error"
                 class="w-full px-3.5 py-2.5 rounded-md outline-none transition-colors"
                 style="background: var(--hds-bg); color: var(--hds-fg); border: 1px solid var(--hds-line);"
               />
+              <div id="email-error" class="hidden text-xs mt-1" style="color: var(--color-hds-error);" aria-live="polite"></div>
             </div>
 
             <div>
@@ -153,6 +159,47 @@ const reCAPTCHA_site_key = '6LeOxaEaAAAAAPD8rQQLqw4woxn1dMjvF_Ooy0BG';
       const successMsg = isEn ? 'Message sent. We will reply soon.' : 'Mensaje enviado. Te respondemos pronto.';
       const errorMsg = isEn ? 'Could not send. Please try again or contact us via WhatsApp.' : 'No se pudo enviar. Probá de nuevo o contactanos por WhatsApp.';
 
+      const nameInput = document.getElementById('name');
+      const emailInput = document.getElementById('email');
+      const nameError = document.getElementById('name-error');
+      const emailError = document.getElementById('email-error');
+      const nameRegex = /[^a-záéíóúüñç\s]/gi;
+      const emailRegex = /^[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,}$/;
+      const nameErrMsg = isEn ? 'Letters and spaces only' : 'Solo letras y espacios';
+      const emailErrMsg = isEn ? 'Invalid email address' : 'Dirección de correo no válida';
+
+      function showFieldError(input, errorEl, msg) {
+        errorEl.textContent = msg;
+        errorEl.classList.remove('hidden');
+        input.style.borderColor = 'var(--color-hds-error)';
+      }
+      function clearFieldError(input, errorEl) {
+        errorEl.classList.add('hidden');
+        errorEl.textContent = '';
+        input.style.borderColor = '';
+      }
+
+      nameInput.addEventListener('beforeinput', (e) => {
+        if (e.data && nameRegex.test(e.data)) {
+          e.preventDefault();
+        }
+      });
+      nameInput.addEventListener('input', () => {
+        const clean = nameInput.value.replace(nameRegex, '');
+        if (clean !== nameInput.value) {
+          nameInput.value = clean;
+        }
+      });
+      emailInput.addEventListener('input', () => {
+        emailInput.value = emailInput.value.toLowerCase();
+      });
+      [nameInput, emailInput].forEach(input => {
+        input.addEventListener('focus', () => {
+          const err = document.getElementById(input.id + '-error');
+          if (err) clearFieldError(input, err);
+        });
+      });
+
       window.addEventListener('load', () => {
         if (window.grecaptcha && window.grecaptcha.ready) {
           window.grecaptcha.ready();
@@ -169,6 +216,22 @@ const reCAPTCHA_site_key = '6LeOxaEaAAAAAPD8rQQLqw4woxn1dMjvF_Ooy0BG';
         status.textContent = '';
         status.style.color = 'var(--hds-fg-soft)';
 
+        let hasError = false;
+        if (nameInput.value.trim() && nameRegex.test(nameInput.value)) {
+          showFieldError(nameInput, nameError, nameErrMsg);
+          hasError = true;
+        }
+        const emailVal = emailInput.value.trim();
+        if (emailVal && !emailRegex.test(emailVal)) {
+          showFieldError(emailInput, emailError, emailErrMsg);
+          hasError = true;
+        }
+        if (hasError) {
+          label.textContent = originalLabel;
+          submit.disabled = false;
+          return;
+        }
+
         try {
           let token = '';
           if (window.grecaptcha && window.grecaptcha.execute) {