From 08daceab47e645a599512f68fcc7a4c19606b56a Mon Sep 17 00:00:00 2001
From: Quang Khai Nguyen <quang_khai.nguyen2@sbb.ch>
Date: Mon, 12 Oct 2026 14:22:01 +0200
Subject: [PATCH] Add seach engine optimization

---
 Dockerfile  |  1 +
 index.html  | 50 +++++++++++++++++++++++++++++++++++++++++++++++---
 robots.txt  |  4 ++++
 sitemap.xml |  6 ++++++
 4 files changed, 58 insertions(+), 3 deletions(-)
 create mode 100644 robots.txt
 create mode 100644 sitemap.xml

diff --git a/Dockerfile b/Dockerfile
index 9a8be86..db45ac9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,6 +8,7 @@ COPY nginx.conf /etc/nginx/conf.d/default.conf
 
 # Copy source code web và thư mục ảnh vào
 COPY index.html /usr/share/nginx/html/
+COPY robots.txt sitemap.xml /usr/share/nginx/html/
 COPY images/ /usr/share/nginx/html/images/
 
 EXPOSE 80
diff --git a/index.html b/index.html
index 697557c..d969e13 100755
--- a/index.html
+++ b/index.html
@@ -4,6 +4,23 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title data-i18n="page_title">Nha Trang — Thiên đường du lịch biển Việt Nam | 芽庄 | Nha Trang | Нячанг</title>
+    <meta name="description" content="Khám phá Nha Trang: các điểm tham quan nổi bật, thời tiết theo mùa, ẩm thực địa phương và tour du lịch.">
+    <link rel="canonical" href="https://kyduyen.duckdns.org/">
+    <meta property="og:type" content="website">
+    <meta property="og:title" content="Nha Trang — Cẩm nang du lịch">
+    <meta property="og:description" content="Khám phá điểm đến, thời tiết, ẩm thực và trải nghiệm tại Nha Trang, Việt Nam.">
+    <meta property="og:url" content="https://kyduyen.duckdns.org/">
+    <meta property="og:locale" content="vi_VN">
+    <script type="application/ld+json">
+        {
+            "@context": "https://schema.org",
+            "@type": "WebSite",
+            "name": "Nha Trang Travel Guide",
+            "url": "https://kyduyen.duckdns.org/",
+            "description": "A travel guide to attractions, seasonal weather, cuisine, and tours in Nha Trang, Vietnam.",
+            "inLanguage": ["vi", "ru", "en", "zh", "de", "fr"]
+        }
+    </script>
     <!-- Tailwind CSS CDN -->
     <script src="https://cdn.tailwindcss.com"></script>
     <!-- FontAwesome Icons -->
@@ -332,7 +349,7 @@
                 <p class="text-brand-100 text-lg" data-i18n="book_desc">Hãy để chúng tôi giúp bạn lên kế hoạch cho chuyến đi hoàn hảo nhất.</p>
             </div>
 
-            <form onsubmit="handleBooking(event)" class="bg-white text-gray-800 p-8 sm:p-12 rounded-3xl shadow-2xl space-y-6">
+            <form action="https://formspree.io/f/YOUR_FORM_ID" method="POST" onsubmit="handleBooking(event)" class="bg-white text-gray-800 p-8 sm:p-12 rounded-3xl shadow-2xl space-y-6">
                 <div class="grid grid-cols-1 sm:grid-cols-2 gap-6">
                     <div>
                         <label for="booking-name" class="block text-sm font-bold text-gray-700 mb-2" data-i18n="form_name">Họ và tên</label>
@@ -367,6 +384,7 @@
                 <button type="submit" class="w-full py-4 bg-brand-500 hover:bg-brand-600 text-white font-bold rounded-xl shadow-lg shadow-brand-500/30 transition text-lg" data-i18n="form_submit">
                     Gửi yêu cầu đặt tour
                 </button>
+                <p id="form-status" role="alert" class="hidden text-sm text-red-600" data-i18n="form_error"></p>
             </form>
         </div>
     </section>
@@ -476,6 +494,7 @@
                 pkg_3: "Nghỉ dưỡng & Tắm bùn khoáng",
                 form_notes: "Yêu cầu đặc biệt",
                 form_submit: "Gửi yêu cầu đặt tour",
+                form_error: "Không thể gửi yêu cầu lúc này. Vui lòng thử lại sau.",
                 footer_copy: "© 2026 Nha Trang Travel Guide. All rights reserved.",
                 modal_title: "Thành công!",
                 modal_desc: "Yêu cầu của bạn đã được gửi. Chúng tôi sẽ liên hệ lại sớm nhất.",
@@ -552,6 +571,7 @@
                 pkg_3: "Спа-отдых & Термальные источники",
                 form_notes: "Пожелания / Заметки",
                 form_submit: "Отправить заявку",
+                form_error: "Не удалось отправить заявку. Пожалуйста, попробуйте позже.",
                 footer_copy: "© 2026 Nha Trang Travel Guide. Все права защищены.",
                 modal_title: "Успешно!",
                 modal_desc: "Ваша заявка отправлена. Мы свяжемся с вами в ближайшее время.",
@@ -628,6 +648,7 @@
                 pkg_3: "Wellness Spa & Mineral Mud Baths",
                 form_notes: "Special Requests",
                 form_submit: "Submit Request",
+                form_error: "Your request could not be sent. Please try again later.",
                 footer_copy: "© 2026 Nha Trang Travel Guide. All rights reserved.",
                 modal_title: "Success!",
                 modal_desc: "Your booking request has been sent. We will contact you shortly.",
@@ -704,6 +725,7 @@
                 pkg_3: "温泉泥浴 & 养生SPA",
                 form_notes: "特殊需求 / 备注",
                 form_submit: "提交预订申请",
+                form_error: "暂时无法发送您的请求，请稍后重试。",
                 footer_copy: "© 2026 Nha Trang Travel Guide. 保留所有权利。",
                 modal_title: "提交成功！",
                 modal_desc: "您的预订申请已成功发送，我们将尽快与您联系。",
@@ -780,6 +802,7 @@
                 pkg_3: "Wellness und Mineral-Schlammbäder",
                 form_notes: "Besondere Wünsche",
                 form_submit: "Anfrage senden",
+                form_error: "Ihre Anfrage konnte nicht gesendet werden. Bitte versuchen Sie es später erneut.",
                 footer_copy: "© 2026 Nha Trang Travel Guide. Alle Rechte vorbehalten.",
                 modal_title: "Erfolgreich!",
                 modal_desc: "Ihre Anfrage wurde gesendet. Wir melden uns in Kürze bei Ihnen.",
@@ -856,6 +879,7 @@
                 pkg_3: "Spa et bains de boue minérale",
                 form_notes: "Demandes particulières",
                 form_submit: "Envoyer la demande",
+                form_error: "Votre demande n'a pas pu être envoyée. Veuillez réessayer plus tard.",
                 footer_copy: "© 2026 Nha Trang Travel Guide. Tous droits réservés.",
                 modal_title: "Demande envoyée !",
                 modal_desc: "Votre demande a bien été envoyée. Nous vous contacterons bientôt.",
@@ -911,9 +935,29 @@
             });
         }
 
-        function handleBooking(event) {
+        async function handleBooking(event) {
             event.preventDefault();
-            document.getElementById('success-modal').classList.remove('hidden');
+            const form = event.currentTarget;
+            const submitButton = form.querySelector('[type="submit"]');
+            const status = document.getElementById('form-status');
+            status.classList.add('hidden');
+            submitButton.disabled = true;
+
+            try {
+                const response = await fetch(form.action, {
+                    method: form.method,
+                    body: new FormData(form),
+                    headers: { Accept: 'application/json' }
+                });
+                if (!response.ok) throw new Error('Form submission failed');
+
+                form.reset();
+                document.getElementById('success-modal').classList.remove('hidden');
+            } catch {
+                status.classList.remove('hidden');
+            } finally {
+                submitButton.disabled = false;
+            }
         }
 
         function closeModal() {
diff --git a/robots.txt b/robots.txt
new file mode 100644
index 0000000..ba996b4
--- /dev/null
+++ b/robots.txt
@@ -0,0 +1,4 @@
+User-agent: *
+Allow: /
+
+Sitemap: https://kyduyen.duckdns.org/sitemap.xml
diff --git a/sitemap.xml b/sitemap.xml
new file mode 100644
index 0000000..b48c8e8
--- /dev/null
+++ b/sitemap.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+    <url>
+        <loc>https://kyduyen.duckdns.org/</loc>
+    </url>
+</urlset>