diff --git a/assets/global/localization.js b/assets/global/localization.js
index 82d1ca7..dfcc686 100644
--- a/assets/global/localization.js
+++ b/assets/global/localization.js
@@ -569,6 +569,46 @@ const translations = {
         kontrib_guideline_3: "Sertakan fakta dan data yang akurat dan dapat diverifikasi.",
         kontrib_guideline_4: "Hindari plagiarisme. Karya harus orisinal.",
         kontrib_guideline_5: "Tim redaksi berhak menyunting konten untuk keperluan editorial.",
+
+        // --- Group C4A: Staf Pendukung & SOP ---
+        grp_c4a_hero_tag: "LAYANAN AKADEMIK \u2022 INFORMATIKA UNTAN",
+        grp_c4a_hero_title: "Staf Pendukung &amp; <br/><span class=\"highlight-orange\">Standar Operasional Prosedur (SOP)</span>",
+        grp_c4a_hero_desc: "Halaman ini menampilkan informasi petugas layanan akademik serta prosedur administrasi mahasiswa Program Studi Informatika UNTAN.",
+        grp_c4a_stat_staf: "Staf Aktif",
+        grp_c4a_stat_sop: "Jenis SOP",
+        grp_c4a_staff_tag: "Tim Kami",
+        grp_c4a_staff_title: "Staf Pendukung",
+        grp_c4a_staff_subtitle: "Staf yang siap melayani kebutuhan akademik dan operasional laboratorium di Prodi Informatika UNTAN.",
+        grp_c4a_sop_tag: "Prosedur Resmi",
+        grp_c4a_sop_title: "Standar Operasional Prosedur (SOP)",
+        grp_c4a_sop_subtitle: "Standar Operasional Prosedur untuk berbagai kebutuhan administrasi akademik mahasiswa. Gunakan pencarian atau filter untuk menemukan SOP yang Anda butuhkan.",
+        grp_c4a_sop_search_placeholder: "Cari SOP berdasarkan judul...",
+        grp_c4a_sop_chip_semua: "Semua",
+        grp_c4a_sop_chip_akademik: "Akademik",
+        grp_c4a_sop_chip_praktikum: "Praktikum",
+        grp_c4a_sop_empty_title: "SOP tidak ditemukan",
+        grp_c4a_sop_empty_desc: "Coba kata kunci lain atau reset filter pencarian.",
+        grp_c4a_sop_reset_btn: "Reset Pencarian",
+        grp_c4a_faq_tag: "Pertanyaan Umum",
+        grp_c4a_faq_title: "Pertanyaan yang Sering Diajukan",
+        grp_c4a_faq_subtitle: "Temukan jawaban cepat atas pertanyaan umum mahasiswa seputar layanan akademik prodi.",
+        grp_c4a_empty_staff: "Data staf pendukung tidak tersedia saat ini.",
+        grp_c4a_empty_sop: "Data SOP tidak tersedia saat ini.",
+        grp_c4a_empty_faq: "Data FAQ tidak tersedia saat ini.",
+        grp_c4a_label_location: "Lokasi",
+        grp_c4a_label_service_hours: "Jam Layanan",
+        grp_c4a_label_wa_contact: "Kontak WhatsApp",
+        grp_c4a_label_tasks: "Tugas & Tanggung Jawab",
+        grp_c4a_label_send_wa: "Kirim Pesan WA",
+        grp_c4a_label_steps: "Langkah",
+        grp_c4a_label_view_detail: "Lihat Detail",
+        grp_c4a_label_responsible_staff: "Staf Bertanggung Jawab (Bersifat Opsional)",
+        grp_c4a_label_additional_info: "Informasi Tambahan (Bersifat Opsional):",
+        grp_c4a_label_purpose: "Tujuan",
+        grp_c4a_label_requirements: "Persyaratan",
+        grp_c4a_label_procedure: "Alur Prosedur",
+        grp_c4a_sop_showing_all: "Menampilkan {total} SOP",
+        grp_c4a_sop_showing_filtered: "Menampilkan {shown} dari {total} SOP",
     },
 
     en: {
@@ -1135,6 +1175,46 @@ const translations = {
         kontrib_guideline_3: "Include accurate and verifiable facts and data.",
         kontrib_guideline_4: "Avoid plagiarism. Work must be original.",
         kontrib_guideline_5: "The editorial team reserves the right to edit content for editorial purposes.",
+
+        // --- Group C4A: Supporting Staff & SOP ---
+        grp_c4a_hero_tag: "ACADEMIC SERVICES \u2022 INFORMATICS UNTAN",
+        grp_c4a_hero_title: "Supporting Staff &amp; <br/><span class=\"highlight-orange\">Standard Operating Procedures (SOP)</span>",
+        grp_c4a_hero_desc: "This page presents information about academic service officers and administrative procedures for students of the Informatics Study Program at UNTAN.",
+        grp_c4a_stat_staf: "Active Staff",
+        grp_c4a_stat_sop: "SOP Types",
+        grp_c4a_staff_tag: "Our Team",
+        grp_c4a_staff_title: "Supporting Staff",
+        grp_c4a_staff_subtitle: "Staff ready to serve academic and laboratory operational needs at the Informatics Study Program, UNTAN.",
+        grp_c4a_sop_tag: "Official Procedures",
+        grp_c4a_sop_title: "Standard Operating Procedures (SOP)",
+        grp_c4a_sop_subtitle: "Standard Operating Procedures for various student academic administration needs. Use search or filter to find the SOP you need.",
+        grp_c4a_sop_search_placeholder: "Search SOP by title...",
+        grp_c4a_sop_chip_semua: "All",
+        grp_c4a_sop_chip_akademik: "Academic",
+        grp_c4a_sop_chip_praktikum: "Practicum",
+        grp_c4a_sop_empty_title: "No SOP found",
+        grp_c4a_sop_empty_desc: "Try another keyword or reset the search filter.",
+        grp_c4a_sop_reset_btn: "Reset Search",
+        grp_c4a_faq_tag: "Frequently Asked",
+        grp_c4a_faq_title: "Frequently Asked Questions",
+        grp_c4a_faq_subtitle: "Find quick answers to common student questions about the study program's academic services.",
+        grp_c4a_empty_staff: "Staff data is currently unavailable.",
+        grp_c4a_empty_sop: "SOP data is currently unavailable.",
+        grp_c4a_empty_faq: "FAQ data is currently unavailable.",
+        grp_c4a_label_location: "Location",
+        grp_c4a_label_service_hours: "Service Hours",
+        grp_c4a_label_wa_contact: "WhatsApp Contact",
+        grp_c4a_label_tasks: "Tasks & Responsibilities",
+        grp_c4a_label_send_wa: "Send WA Message",
+        grp_c4a_label_steps: "Steps",
+        grp_c4a_label_view_detail: "View Details",
+        grp_c4a_label_responsible_staff: "Responsible Staff (Optional)",
+        grp_c4a_label_additional_info: "Additional Information (Optional):",
+        grp_c4a_label_purpose: "Purpose",
+        grp_c4a_label_requirements: "Requirements",
+        grp_c4a_label_procedure: "Procedure Flow",
+        grp_c4a_sop_showing_all: "Showing {total} SOP",
+        grp_c4a_sop_showing_filtered: "Showing {shown} of {total} SOP",
     }
 };
 
diff --git a/groups/C4A/README.md b/groups/C4A/README.md
new file mode 100644
index 0000000..abb90fa
--- /dev/null
+++ b/groups/C4A/README.md
@@ -0,0 +1,125 @@
+# Panduan Pengelolaan Data Kelompok C4A
+
+Dokumentasi ini dibuat untuk memudahkan pengembang atau pengguna berikutnya dalam mengelola data Staf Pendukung, SOP, dan FAQ pada halaman C4A.
+
+---
+
+## 📋 Aturan Umum Pengelolaan Data
+
+1. **Lokasi Berkas Data**:
+   Seluruh data disimpan dalam format JSON di direktori `groups/C4A/data/`:
+   - Data Staf: `groups/C4A/data/data-staff.json`
+   - Data SOP: `groups/C4A/data/data-sop.json`
+   - Data FAQ: `groups/C4A/data/data-faq.json`
+
+2. **Dukungan Bilingual (ID/EN)**:
+   Semua teks konten yang ditampilkan ke pengguna mendukung dua bahasa. Anda perlu menggunakan objek dengan properti `id` (Bahasa Indonesia) dan `en` (Bahasa Inggris) pada setiap field teks. Jika properti `en` tidak diisi atau data masih berupa *string* biasa, sistem akan otomatis menggunakan Bahasa Indonesia sebagai *fallback*.
+
+3. **Ikon FontAwesome (v4)**:
+   Jika ingin mengubah atau menambahkan logo/ikon pada data SOP, harap gunakan daftar ikon dari **FontAwesome v4** melalui tautan berikut:
+   👉 **[FontAwesome v4 Icons](https://fontawesome.com/v4/icons/)** (Contoh penggunaan: `fa-dot-circle-o`, `fa-graduation-cap`, `fa-flask`).
+
+4. **Field Opsional**:
+   Pada data SOP, properti **`staff_responsible`** (Staf Bertanggung Jawab) dan **`additional_info`** (Informasi Tambahan) bersifat **opsional**. Jika informasi tersebut tidak tersedia, kosongkan nilainya atau hapus propertinya dari JSON agar UI secara otomatis menyembunyikan bloknya.
+
+---
+
+## 🛠️ Template Penambahan Data
+
+Silakan salin-tempel (copy-paste) format di bawah ini ke dalam array JSON yang sesuai di folder `data/` untuk menambahkan data baru.
+
+### 1. Template Data Staf (`data-staff.json`)
+```json
+{
+    "id": 3,
+    "name": "Nama Staf Beserta Gelar",
+    "role": {
+        "id": "Peran / Jabatan Staf",
+        "en": "Staff Role / Title"
+    },
+    "image": "assets/images/nama-file-foto.png",
+    "location": {
+        "id": "Lokasi Ruang Kerja / Kantor Staf",
+        "en": "Staff Workspace / Office Location"
+    },
+    "contact_consent": true,
+    "phone": "628xxxxxxxxxx",
+    "schedule": [
+        {
+            "day": {
+                "id": "Hari Kerja (contoh: Senin – Jumat)",
+                "en": "Work Days (e.g., Monday – Friday)"
+            },
+            "time": "07.30–16.00 WIB",
+            "break": {
+                "id": "Jam Istirahat (contoh: istirahat 12.00–13.00 WIB)",
+                "en": "Break Time (e.g., break 12.00–13.00 WIB)"
+            }
+        }
+    ],
+    "tasks": [
+        {
+            "id": "Tugas dan tanggung jawab utama 1",
+            "en": "Main task and responsibility 1"
+        },
+        {
+            "id": "Tugas dan tanggung jawab utama 2",
+            "en": "Main task and responsibility 2"
+        }
+    ]
+}
+```
+*Catatan: Letakkan file gambar/foto staf ke dalam direktori `groups/C4A/assets/images/` dan masukkan nama berkas fotonya pada properti `image` di atas. Untuk nomor telepon (`phone`), Anda dapat menggunakan format `08xxxxxxxxxx` atau `628xxxxxxxxxx` karena skrip JavaScript akan melakukan normalisasi secara otomatis.*
+
+### 2. Template Data SOP (`data-sop.json`)
+```json
+{
+    "tab_id": "id-unik-sop-tanpa-spasi",
+    "tab_number": 9,
+    "category": "akademik", 
+    "icon": "fa-file-text",
+    "title": {
+        "id": "Judul Lengkap SOP",
+        "en": "Full SOP Title"
+    },
+    "description": {
+        "id": "Deskripsi singkat mengenai SOP ini.",
+        "en": "Brief description of this SOP."
+    },
+    "purpose": {
+        "id": "Tujuan dibuatnya standar operasional prosedur ini.",
+        "en": "The purpose of creating this standard operating procedure."
+    },
+    "requirements": [
+        { "id": "Persyaratan administratif/akademik 1", "en": "Administrative/academic requirement 1" },
+        { "id": "Persyaratan administratif/akademik 2", "en": "Administrative/academic requirement 2" }
+    ],
+    "procedures": [
+        { "id": "Langkah alur prosedur ke-1", "en": "Procedure flow step 1" },
+        { "id": "Langkah alur prosedur ke-2", "en": "Procedure flow step 2" }
+    ],
+    "staff_responsible": [
+        "👤 Staf Administrasi Informatika / Informatics Administrative Staff"
+    ],
+    "additional_info": {
+        "id": "Informasi tambahan penting.",
+        "en": "Important additional information."
+    }
+}
+```
+*Catatan: Properti `category` bernilai antara `"akademik"` atau `"praktikum"`. Properti `staff_responsible` dan `additional_info` bersifat opsional.*
+
+### 3. Template Data FAQ (`data-faq.json`)
+```json
+{
+    "id": 11,
+    "question": {
+        "id": "Pertanyaan yang sering diajukan?",
+        "en": "Frequently asked question?"
+    },
+    "answer": {
+        "id": "Jawaban dari pertanyaan tersebut. Boleh menggunakan tag HTML seperti <strong>tebal</strong>.",
+        "en": "Answer to the question. HTML tags like <strong>bold</strong> can be used."
+    }
+}
+```
diff --git a/groups/C4A/index.html b/groups/C4A/index.html
index c89bb6f..6652060 100644
--- a/groups/C4A/index.html
+++ b/groups/C4A/index.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!DOCTYPE html>
 <html lang="id" class="scroll-smooth">
 
 <head>
@@ -1160,13 +1160,13 @@
                 <!-- HERO SECTION -->
                 <section class="c4a-hero reveal">
                     <div class="c4a-hero-inner">
-                        <div class="c4a-hero-tag">LAYANAN AKADEMIK &bull; INFORMATIKA UNTAN
+                        <div class="c4a-hero-tag" data-i18n="grp_c4a_hero_tag">LAYANAN AKADEMIK &bull; INFORMATIKA UNTAN
                         </div>
-                        <h1 class="c4a-hero-title">
-                            Staf Pendukung &amp; <br />
+                        <h1 class="c4a-hero-title" data-i18n-html="grp_c4a_hero_title">
+                            Staf Pendukung &amp; <br/>
                             <span class="highlight-orange">Standar Operasional Prosedur (SOP)</span>
                         </h1>
-                        <p class="c4a-hero-desc">Halaman ini menampilkan informasi petugas
+                        <p class="c4a-hero-desc" data-i18n="grp_c4a_hero_desc">Halaman ini menampilkan informasi petugas
                             layanan akademik serta
                             prosedur administrasi
                             mahasiswa
@@ -1174,12 +1174,12 @@
                         <div class="hero-stats">
                             <div class="stat-item">
                                 <div class="stat-number" id="stat-staf">0</div>
-                                <div class="stat-label">Staf Aktif</div>
+                                <div class="stat-label" data-i18n="grp_c4a_stat_staf">Staf Aktif</div>
                             </div>
                             <div class="stat-divider"></div>
                             <div class="stat-item">
                                 <div class="stat-number" id="stat-sop">0</div>
-                                <div class="stat-label">Jenis SOP</div>
+                                <div class="stat-label" data-i18n="grp_c4a_stat_sop">Jenis SOP</div>
                             </div>
                         </div>
                     </div>
@@ -1188,10 +1188,10 @@
                 <!-- STAFF SECTION -->
                 <section class="content-section">
                     <div class="section-header">
-                        <div class="section-tag"><span class="dot"></span> <span>Tim
+                        <div class="section-tag"><span class="dot"></span> <span data-i18n="grp_c4a_staff_tag">Tim
                                 Kami</span></div>
-                        <h2 class="section-title">Staf Pendukung</h2>
-                        <p class="section-subtitle">Staf yang siap melayani kebutuhan
+                        <h2 class="section-title" data-i18n="grp_c4a_staff_title">Staf Pendukung</h2>
+                        <p class="section-subtitle" data-i18n="grp_c4a_staff_subtitle">Staf yang siap melayani kebutuhan
                             akademik dan operasional
                             laboratorium di Prodi Informatika UNTAN.</p>
                     </div>
@@ -1203,10 +1203,10 @@
                 <!-- SOP SECTION -->
                 <section class="sop-section">
                     <div class="section-header">
-                        <div class="section-tag"><span class="dot"></span> <span>Prosedur
+                        <div class="section-tag"><span class="dot"></span> <span data-i18n="grp_c4a_sop_tag">Prosedur
                                 Resmi</span></div>
-                        <h2 class="section-title">Standar Operasional Prosedur (SOP)</h2>
-                        <p class="section-subtitle">Standar Operasional Prosedur untuk
+                        <h2 class="section-title" data-i18n="grp_c4a_sop_title">Standar Operasional Prosedur (SOP)</h2>
+                        <p class="section-subtitle" data-i18n="grp_c4a_sop_subtitle">Standar Operasional Prosedur untuk
                             berbagai kebutuhan administrasi
                             akademik mahasiswa. Gunakan pencarian atau filter untuk menemukan SOP yang Anda butuhkan.
                         </p>
@@ -1217,6 +1217,7 @@
                         <div class="sop-search-wrap">
                             <i class="fas fa-search sop-search-icon"></i>
                             <input type="search" id="sop-search-input" class="sop-search-input"
+                                data-i18n-placeholder="grp_c4a_sop_search_placeholder"
                                 placeholder="Cari SOP berdasarkan judul..." autocomplete="off" aria-label="Cari SOP" />
                             <button class="sop-search-clear" id="sop-search-clear" aria-label="Hapus pencarian"
                                 style="display:none;">
@@ -1225,12 +1226,12 @@
                         </div>
                         <div class="sop-filter-chips" id="sop-filter-chips" role="group"
                             aria-label="Filter kategori SOP">
-                            <button class="sop-chip active" data-filter="semua" id="chip-semua">Semua</button>
+                            <button class="sop-chip active" data-filter="semua" id="chip-semua" data-i18n="grp_c4a_sop_chip_semua">Semua</button>
                             <button class="sop-chip" data-filter="akademik" id="chip-akademik">
-                                <i class="fas fa-graduation-cap"></i> <span>Akademik</span>
+                                <i class="fas fa-graduation-cap"></i> <span data-i18n="grp_c4a_sop_chip_akademik">Akademik</span>
                             </button>
                             <button class="sop-chip" data-filter="praktikum" id="chip-praktikum">
-                                <i class="fas fa-flask"></i> <span>Praktikum</span>
+                                <i class="fas fa-flask"></i> <span data-i18n="grp_c4a_sop_chip_praktikum">Praktikum</span>
                             </button>
                         </div>
                     </div>
@@ -1244,8 +1245,8 @@
                     <!-- EMPTY STATE -->
                     <div class="sop-empty-state" id="sop-empty-state" style="display:none;">
                         <i class="fas fa-search-minus sop-empty-icon"></i>
-                        <p class="sop-empty-title">SOP tidak ditemukan</p>
-                        <p class="sop-empty-desc">Coba kata kunci lain atau reset
+                        <p class="sop-empty-title" data-i18n="grp_c4a_sop_empty_title">SOP tidak ditemukan</p>
+                        <p class="sop-empty-desc" data-i18n="grp_c4a_sop_empty_desc">Coba kata kunci lain atau reset
                             filter pencarian.</p>
                         <button class="sop-empty-reset" id="sop-empty-reset">
                             <i class="fas fa-undo"></i> <span data-i18n="grp_c4a_sop_reset_btn">Reset Pencarian</span>
@@ -1268,12 +1269,13 @@
                 <section class="faq-section-wrap">
                     <div class="faq-section-inner">
                         <div class="faq-header reveal">
-                            <div class="section-tag"><span class="dot"></span> <span>Pertanyaan Umum</span></div>
-                            <h2>Pertanyaan yang Sering Diajukan</h2>
-                            <p>Temukan jawaban cepat atas pertanyaan umum mahasiswa
+                            <div class="section-tag"><span class="dot"></span> <span data-i18n="grp_c4a_faq_tag">Pertanyaan Umum</span></div>
+                            <h2 data-i18n="grp_c4a_faq_title">Pertanyaan yang Sering Diajukan</h2>
+                            <p data-i18n="grp_c4a_faq_subtitle">Temukan jawaban cepat atas pertanyaan umum mahasiswa
                                 seputar layanan akademik prodi.</p>
                         </div>
 
+
                         <div class="faq-wrap" id="faq-container">
                             <!-- Item FAQ diisi secara dinamis melalui main.js berdasarkan data-faq.json -->
                         </div>
diff --git a/groups/C4A/js/data.js b/groups/C4A/js/data.js
index d30e302..beb1b65 100644
--- a/groups/C4A/js/data.js
+++ b/groups/C4A/js/data.js
@@ -52,3 +52,5 @@ export async function getFaqData() {
         return [];
     }
 }
+
+
diff --git a/groups/C4A/js/main.js b/groups/C4A/js/main.js
index 8cee83e..56a0743 100644
--- a/groups/C4A/js/main.js
+++ b/groups/C4A/js/main.js
@@ -10,12 +10,14 @@ import {
     renderFaqSection,
     initSopInteraction,
     initAnimations,
-    initFaq
+    initFaq,
+    applySopFilter
 } from './ui.js';
 
 // Cache data secara global untuk mendukung rendering UI
 let cachedStaffData = [];
 let cachedSopData = [];
+let cachedFaqData = [];
 
 /**
  * Menginisialisasi aplikasi dengan mengambil seluruh data secara pararel,
@@ -32,10 +34,11 @@ async function initApp() {
 
         cachedStaffData = staffData || [];
         cachedSopData = sopData || [];
+        cachedFaqData = faqData || [];
 
         renderStaffCards(cachedStaffData);
         renderSopCards(cachedSopData);
-        renderFaqSection(faqData || []);
+        renderFaqSection(cachedFaqData);
 
         initSopInteraction();
         initFaq();
@@ -49,8 +52,20 @@ async function initApp() {
     }
 }
 
-// NOTE: Fitur bilingual sudah dihapus - languageChanged listener tidak lagi diperlukan
-// Silakan hapus atau archive jika ada implementasi global untuk bahasa
+// Re-render UI saat bahasa berubah (data tetap sama, hanya label UI yang berganti via t())
+document.addEventListener('languageChanged', () => {
+    renderStaffCards(cachedStaffData);
+    renderSopCards(cachedSopData);
+    renderFaqSection(cachedFaqData);
+    initFaq();
+    applySopFilter();
+
+    // Re-inisialisasi observer agar elemen .reveal yang baru di-render mendapat class .visible
+    setTimeout(() => {
+        initAnimations();
+    }, 100);
+});
 
 // Jalankan inisialisasi aplikasi saat DOM siap
 document.addEventListener('DOMContentLoaded', initApp);
+
diff --git a/groups/C4A/js/ui.js b/groups/C4A/js/ui.js
index 193ed38..10cdf4b 100644
--- a/groups/C4A/js/ui.js
+++ b/groups/C4A/js/ui.js
@@ -1,5 +1,31 @@
 // --- Helper Fungsi ---
 
+/**
+ * Helper untuk menerjemahkan string berdasarkan key dari localization.js.
+ * Menggunakan fallback jika key tidak ditemukan atau localization.js tidak aktif.
+ */
+function t(key, fallback) {
+    if (window.t) {
+        const val = window.t(key);
+        if (val !== key) return val;
+    }
+    return fallback;
+}
+
+/**
+ * Helper untuk melokalisasi teks dari objek bilingual {id, en} atau string biasa.
+ * @param {string|Object} field - Data teks (bisa string biasa atau objek {id, en})
+ * @returns {string} Teks terlokalisasi
+ */
+function loc(field) {
+    if (!field) return '';
+    if (typeof field === 'object') {
+        const lang = (window.getLang && typeof window.getLang === 'function') ? window.getLang() : 'id';
+        return field[lang] || field['id'] || '';
+    }
+    return String(field);
+}
+
 /**
  * Normalisasi nomor telepon ke format standard e.g. 628...
  * @param {string} phone - Nomor telepon mentah
@@ -36,6 +62,29 @@ function isValidWhatsAppNumber(phone) {
     return norm.startsWith('628') && norm.length >= 10 && norm.length <= 15;
 }
 
+/**
+ * Enkripsi nomor telepon menggunakan Base64 untuk keamanan kontak.
+ * @param {string} phone - Nomor telepon ternormalisasi
+ * @returns {string} Nomor telepon terenkripsi Base64
+ */
+function encodePhone(phone) {
+    return btoa(normalizePhone(phone));
+}
+
+/**
+ * Dekripsi nomor telepon dari Base64.
+ * @param {string} encoded - Nomor telepon terenkripsi Base64
+ * @returns {string} Nomor telepon terdekripsi
+ */
+function decodePhone(encoded) {
+    try {
+        return atob(encoded);
+    } catch (error) {
+        console.error('Gagal mendekripsi nomor telepon:', error);
+        return '';
+    }
+}
+
 /**
  * Merender daftar staf pendukung ke dalam container HTML.
  * @param {Array<Object>} staffs - Array data staf pendukung
@@ -47,7 +96,7 @@ export function renderStaffCards(staffs) {
     container.innerHTML = '';
 
     if (!staffs || staffs.length === 0) {
-        container.innerHTML = `<p class="empty-state-msg">Data staf pendukung tidak tersedia saat ini.</p>`;
+        container.innerHTML = `<p class="empty-state-msg">${t('grp_c4a_empty_staff', 'Data staf pendukung tidak tersedia saat ini.')}</p>`;
         return;
     }
 
@@ -58,18 +107,24 @@ export function renderStaffCards(staffs) {
             image,
             location,
             phone,
+            contact_consent: contactConsent,
             schedule,
             tasks
         } = staff;
 
         const scheduleHTML = schedule.map(sched =>
             `<div class="schedule-item">` +
-                `<span class="s-day">${sched.day}</span>` +
-                `<span class="s-time">${sched.time} <span class="s-break">| ${sched.break}</span></span>` +
+                `<span class="s-day">${loc(sched.day)}</span>` +
+                `<span class="s-time">${loc(sched.time)} <span class="s-break">| ${loc(sched.break)}</span></span>` +
             `</div>`
         ).join('');
 
-        const tasksHTML = tasks.map(task => `<li>${task}</li>`).join('');
+        const tasksHTML = tasks.map(task => `<li>${loc(task)}</li>`).join('');
+        const isPhoneValid = isValidWhatsAppNumber(phone);
+        const encodedPhone = isPhoneValid ? encodePhone(phone) : '';
+        const displayPhone = isPhoneValid ? formatPhoneForDisplay(phone) : '-';
+        const hideContactItemClass = contactConsent ? '' : 'is-hidden';
+        const hideContactActionClass = (contactConsent && isPhoneValid) ? '' : 'is-hidden';
         const initial = name ? name.charAt(0).toUpperCase() : '';
 
         const card = document.createElement('div');
@@ -82,29 +137,44 @@ export function renderStaffCards(staffs) {
           <img src="${image}" alt="${name}" onerror="this.style.display='none'"/>
         </div>
         <div>
-          <div class="staff-name">${name}</div>
-          <div class="staff-role">${role}</div>
+          <div class="staff-name">${loc(name)}</div>
+          <div class="staff-role">${loc(role)}</div>
         </div>
       </div>
       <div class="staff-card-body">
         <div class="staff-info-grid">
-          <div class="staff-info-item"><span class="icon">📍</span><div><span class="label">Lokasi</span><span class="val">${location}</span></div></div>
+          <div class="staff-info-item"><span class="icon">📍</span><div><span class="label">${t('grp_c4a_label_location', 'Lokasi')}</span><span class="val">${loc(location)}</span></div></div>
           <div class="staff-info-item">
             <span class="icon">🕒</span>
             <div style="flex:1">
-              <span class="label">Jam Layanan</span>
+              <span class="label">${t('grp_c4a_label_service_hours', 'Jam Layanan')}</span>
               <div class="schedule-list">${scheduleHTML}</div>
             </div>
           </div>
-          <div class="staff-info-item"><span class="icon">📞</span><div><span class="label">Kontak</span><span class="val">${phone}</span></div></div>
+          <div class="staff-info-item staff-contact-item ${hideContactItemClass}"><span class="icon">📞</span><div><span class="label">${t('grp_c4a_label_wa_contact', 'Kontak WhatsApp')}</span><span class="val">${displayPhone}</span></div></div>
         </div>
         <div class="staff-divider"></div>
-        <div class="staff-tasks-title">Tugas & Tanggung Jawab</div>
+        <div class="staff-tasks-title">${t('grp_c4a_label_tasks', 'Tugas & Tanggung Jawab')}</div>
         <ul class="staff-tasks">${tasksHTML}</ul>
       </div>
+      <div class="staff-card-actions staff-contact-actions ${hideContactActionClass}">
+        <button class="btn-staff btn-staff-wa" data-wa="${encodedPhone}" aria-label="${t('grp_c4a_label_send_wa', 'Kirim Pesan WA')} ${name}"><svg class="wa-icon" viewBox="0 0 24 24" fill="currentColor" xmlns="http://www.w3.org/2000/svg"><path d="M17.472 14.382c-.297-.149-1.758-.867-2.03-.967-.273-.099-.471-.148-.67.15-.197.297-.767.966-.94 1.164-.173.199-.347.223-.644.075-.297-.15-1.255-.463-2.39-1.475-.883-.788-1.48-1.761-1.653-2.059-.173-.297-.018-.458.13-.606.134-.133.298-.347.446-.52.149-.174.198-.298.298-.497.099-.198.05-.371-.025-.52-.075-.149-.669-1.612-.916-2.207-.242-.579-.487-.5-.669-.51-.173-.008-.371-.01-.57-.01-.198 0-.52.074-.792.372-.272.297-1.04 1.016-1.04 2.479 0 1.462 1.065 2.875 1.213 3.074.149.198 2.096 3.2 5.077 4.487.709.306 1.262.489 1.694.625.712.227 1.36.195 1.871.118.571-.085 1.758-.719 2.006-1.413.248-.694.248-1.289.173-1.413-.074-.124-.272-.198-.57-.347m-5.421 7.403h-.004a9.87 9.87 0 01-5.031-1.378l-.361-.214-3.741.982.998-3.648-.235-.374a9.86 9.86 0 01-1.51-5.26c.001-5.45 4.436-9.884 9.888-9.884 2.64 0 5.122 1.03 6.988 2.898a9.825 9.825 0 012.893 6.994c-.003 5.45-4.437 9.884-9.885 9.884m8.413-18.297A11.815 11.815 0 0012.05 0C5.495 0 .16 5.335.157 11.892c0 2.096.547 4.142 1.588 5.945L.057 24l6.305-1.654a11.882 11.882 0 005.683 1.448h.005c6.554 0 11.89-5.335 11.893-11.893a11.821 11.821 0 00-3.48-8.413z"/></svg> ${t('grp_c4a_label_send_wa', 'Kirim Pesan WA')}</button>
+      </div>
+
     `;
 
         container.appendChild(card);
+
+        // Setup WA button click handler dengan dekrips nomor
+        const waBtn = card.querySelector('[data-wa]');
+        if (waBtn) {
+            waBtn.addEventListener('click', () => {
+                const phoneNum = decodePhone(waBtn.dataset.wa);
+                if (phoneNum) {
+                    window.open(`https://wa.me/${phoneNum}`, '_blank', 'noopener,noreferrer');
+                }
+            });
+        }
     });
 }
 // ============================================================
@@ -122,8 +192,11 @@ const CATEGORY_COLORS = {
  * @returns {string} Label kategori
  */
 function getCatLabel(category) {
-    const map = { akademik: 'Akademik', praktikum: 'Praktikum' };
-    return map[category] || 'Akademik';
+    const map = {
+        akademik: t('grp_c4a_sop_chip_akademik', 'Akademik'),
+        praktikum: t('grp_c4a_sop_chip_praktikum', 'Praktikum')
+    };
+    return map[category] || t('grp_c4a_sop_chip_akademik', 'Akademik');
 }
 
 /**
@@ -143,28 +216,30 @@ function buildSopCard(sop) {
 
     const catLabel = getCatLabel(category);
     const catClass = CATEGORY_COLORS[category] || '';
+    const titleText = loc(title);
+    const descText = loc(description);
 
     return `
-    <article class="sop-grid-card reveal" data-tab-id="${tabId}" data-category="${category}" data-title="${title.toLowerCase()}">
+    <article class="sop-grid-card reveal" data-tab-id="${tabId}" data-category="${category}" data-title="${titleText.toLowerCase()}">
       <div class="sgc-header">
         <div class="sgc-icon-wrap">
           <i class="fas ${icon}"></i>
         </div>
         <div class="sgc-meta">
-          <h3 class="sgc-title">${title}</h3>
+          <h3 class="sgc-title">${titleText}</h3>
         </div>
       </div>
       <div class="sgc-category-row">
         <span class="sgc-category ${catClass}">${catLabel}</span>
       </div>
-      <p class="sgc-desc">${description}</p>
+      <p class="sgc-desc">${descText}</p>
       <div class="sgc-footer">
         <div class="sgc-steps">
           <i class="fas fa-list-ol"></i>
-          <span>${procedures.length} Langkah</span>
+          <span>${procedures.length} ${t('grp_c4a_label_steps', 'Langkah')}</span>
         </div>
-        <button class="sgc-detail-btn" data-tab-id="${tabId}" aria-label="Lihat Detail ${title}">
-          Lihat Detail <i class="fas fa-arrow-right"></i>
+        <button class="sgc-detail-btn" data-tab-id="${tabId}" aria-label="${t('grp_c4a_label_view_detail', 'Lihat Detail')} ${titleText}">
+          ${t('grp_c4a_label_view_detail', 'Lihat Detail')} <i class="fas fa-arrow-right"></i>
         </button>
       </div>
     </article>`;
@@ -191,26 +266,31 @@ function buildSopModalContent(sop) {
     const catLabel = getCatLabel(category);
     const catClass = CATEGORY_COLORS[category] || '';
 
-    const reqsHTML = requirements.map(req => `<li>${req}</li>`).join('');
-    const procsHTML = procedures.map(proc => `<li>${proc}</li>`).join('');
+    const titleText = loc(title);
+    const descText = loc(description);
+    const purposeText = loc(purpose);
+    const additionalInfoText = loc(additionalInfo);
+
+    const reqsHTML = requirements.map(req => `<li>${loc(req)}</li>`).join('');
+    const procsHTML = procedures.map(proc => `<li>${loc(proc)}</li>`).join('');
 
     // staffResponsible bersifat opsional — sembunyikan blok jika tidak ada
     const hasStaff = Array.isArray(staffResponsible) && staffResponsible.length > 0;
     const staffHTML = hasStaff
-        ? staffResponsible.map(staffName => `<span class="sop-staff-pill">${staffName}</span>`).join('')
+        ? staffResponsible.map(staffName => `<span class="sop-staff-pill">${loc(staffName)}</span>`).join('')
         : '';
     const staffBlockHTML = hasStaff
         ? `<div class="sop-staff-block">
-        <div class="sop-block-label">Staf Bertanggung Jawab (Bersifat Opsional)</div>
+        <div class="sop-block-label">${t('grp_c4a_label_responsible_staff', 'Staf Bertanggung Jawab (Bersifat Opsional)')}</div>
         <div class="sop-staff-pills">${staffHTML}</div>
       </div>`
         : '';
 
     // additionalInfo bersifat opsional — sembunyikan blok jika tidak ada
-    const additionalInfoHTML = additionalInfo
+    const additionalInfoHTML = additionalInfoText
         ? `<div class="sop-info-box">
         <span class="iico">ℹ️</span>
-        <p class="sop-info-box-text"><strong>Informasi Tambahan (Bersifat Opsional):</strong> ${additionalInfo}</p>
+        <p class="sop-info-box-text"><strong>${t('grp_c4a_label_additional_info', 'Informasi Tambahan (Bersifat Opsional):')}</strong> ${additionalInfoText}</p>
       </div>`
         : '';
 
@@ -224,23 +304,23 @@ function buildSopModalContent(sop) {
           <div class="sop-modal-badges">
             <span class="sgc-category ${catClass}">${catLabel}</span>
           </div>
-          <h2 class="sop-modal-title" id="sop-modal-title">${title}</h2>
-          <p class="sop-modal-desc">${description}</p>
+          <h2 class="sop-modal-title" id="sop-modal-title">${titleText}</h2>
+          <p class="sop-modal-desc">${descText}</p>
         </div>
       </div>
     </div>
     <div class="sop-modal-body">
       <div class="sop-block">
-        <div class="sop-block-label">Tujuan</div>
-        <p class="sop-block-text">${purpose}</p>
+        <div class="sop-block-label">${t('grp_c4a_label_purpose', 'Tujuan')}</div>
+        <p class="sop-block-text">${purposeText}</p>
       </div>
       <div class="sop-two-col">
         <div>
-          <div class="sop-block-label">Persyaratan</div>
+          <div class="sop-block-label">${t('grp_c4a_label_requirements', 'Persyaratan')}</div>
           <ul class="sop-list bullets">${reqsHTML}</ul>
         </div>
         <div>
-          <div class="sop-block-label">Alur Prosedur</div>
+          <div class="sop-block-label">${t('grp_c4a_label_procedure', 'Alur Prosedur')}</div>
           <ul class="sop-list numbered">${procsHTML}</ul>
         </div>
       </div>
@@ -260,15 +340,19 @@ export function renderSopCards(sops) {
     // simpan data global di element agar bisa diakses filter/search
     container._sopData = sops;
 
+    const emptyState = document.getElementById('sop-empty-state');
+
     // Tampilkan pesan jika data SOP kosong atau gagal dimuat
     if (!sops || sops.length === 0) {
-        container.innerHTML = `<p class="empty-state-msg">Data SOP tidak tersedia saat ini.</p>`;
+        container.innerHTML = `<p class="empty-state-msg">${t('grp_c4a_empty_sop', 'Data SOP tidak tersedia saat ini.')}</p>`;
         updateResultInfo(0, 0);
+        if (emptyState) emptyState.style.display = 'none';
         return;
     }
 
     container.innerHTML = sops.map(buildSopCard).join('');
     updateResultInfo(sops.length, sops.length);
+    if (emptyState) emptyState.style.display = 'none';
 }
 
 /** Update teks info jumlah hasil */
@@ -276,16 +360,18 @@ function updateResultInfo(shown, total) {
     const el = document.getElementById('sop-result-info');
     if (!el) return;
     if (shown === total) {
-        el.textContent = `Menampilkan ${total} SOP`;
+        const allTemplate = t('grp_c4a_sop_showing_all', 'Menampilkan {total} SOP');
+        el.textContent = allTemplate.replace('{total}', total);
     } else {
-        el.textContent = `Menampilkan ${shown} dari ${total} SOP`;
+        const filteredTemplate = t('grp_c4a_sop_showing_filtered', 'Menampilkan {shown} dari {total} SOP');
+        el.textContent = filteredTemplate.replace('{shown}', shown).replace('{total}', total);
     }
 }
 
 /**
  * Memfilter dan menyaring kartu SOP berdasarkan query pencarian dan chip filter aktif.
  */
-function applySopFilter() {
+export function applySopFilter() {
     const container = document.getElementById('sop-cards-container');
     if (!container) return;
 
@@ -310,11 +396,17 @@ function applySopFilter() {
     });
 
     const emptyState = document.getElementById('sop-empty-state');
-    if (emptyState) emptyState.style.display = visibleCount === 0 ? 'flex' : 'none';
+    if (emptyState) {
+        // Tampilkan "SOP tidak ditemukan" HANYA jika memang ada data SOP tetapi hasil filter 0.
+        // Jika data SOP memang kosong (tidak ada card sama sekali di data source), sembunyikan.
+        const hasData = container._sopData && container._sopData.length > 0;
+        emptyState.style.display = (hasData && visibleCount === 0) ? 'flex' : 'none';
+    }
 
     updateResultInfo(visibleCount, cards.length);
 }
 
+
 /**
  * Membuka modal detail untuk SOP tertentu berdasarkan tab_id.
  * @param {string} tabId - ID unik tab/SOP yang ingin ditampilkan
@@ -552,10 +644,11 @@ export function renderFaqSection(faqs) {
     if (!container) return;
 
     if (!faqs || faqs.length === 0) {
-        container.innerHTML = `<p class="empty-state-msg">Data FAQ tidak tersedia saat ini.</p>`;
+        container.innerHTML = `<p class="empty-state-msg">${t('grp_c4a_empty_faq', 'Data FAQ tidak tersedia saat ini.')}</p>`;
         return;
     }
 
+
     const delayClasses = ['reveal-delay-1', 'reveal-delay-2', 'reveal-delay-3'];
 
     const itemsHTML = faqs.map((faq, index) => {
@@ -563,11 +656,11 @@ export function renderFaqSection(faqs) {
         return `
         <div class="faq-item reveal ${delayClass}">
             <div class="faq-question">
-                <span class="faq-question-text">${faq.question}</span>
+                <span class="faq-question-text">${loc(faq.question)}</span>
                 <div class="faq-icon">+</div>
             </div>
             <div class="faq-answer">
-                <div class="faq-answer-inner">${faq.answer}</div>
+                <div class="faq-answer-inner">${loc(faq.answer)}</div>
             </div>
         </div>`;
     }).join('');