diff --git a/404.php b/404.php
index 691683f..16c84c3 100644
--- a/404.php
+++ b/404.php
@@ -1,3 +1,4 @@
+<?php defined( 'ABSPATH' ) || exit; ?>
 <?php
 /**
  * Template untuk Halaman Tidak Ditemukan (Error 404)
diff --git a/footer.php b/footer.php
index 2db20b2..dd9654a 100644
--- a/footer.php
+++ b/footer.php
@@ -1,3 +1,4 @@
+<?php defined( 'ABSPATH' ) || exit; ?>
 <?php
 /**
  * Template Footer EduKarsa Modern 4-Kolom
diff --git a/front-page.php b/front-page.php
index 12141f4..1ef8d26 100644
--- a/front-page.php
+++ b/front-page.php
@@ -1,3 +1,4 @@
+<?php defined( 'ABSPATH' ) || exit; ?>
 <?php get_header(); ?>
 
 <main id="primary" class="site-main edukarsa-home">
diff --git a/functions.php b/functions.php
index 0217ccf..08f7985 100644
--- a/functions.php
+++ b/functions.php
@@ -4,17 +4,22 @@
  * Seluruh logika modular ditempatkan di folder inc/
  */
 
-// 1. Memuat Modul Kamus Dinamis Dashboard (i18n)
+defined( 'ABSPATH' ) || exit;
+
+// 1. Memuat Modul Keamanan & Hardening Native
+require_once get_template_directory() . '/inc/security.php';
+
+// 2. Memuat Modul Kamus Dinamis Dashboard (i18n)
 require_once get_template_directory() . '/inc/i18n.php';
 
-// 2. Memuat Pengaturan Dasar Tema & Aset
+// 3. Memuat Pengaturan Dasar Tema & Aset
 require_once get_template_directory() . '/inc/setup.php';
 
-// 3. Memuat Custom Post Type Native
+// 4. Memuat Custom Post Type Native
 require_once get_template_directory() . '/inc/cpt-slider.php';
 
-// 4. Memuat Panel Menu EduKarsa & Settings API
+// 5. Memuat Panel Menu EduKarsa & Settings API
 require_once get_template_directory() . '/inc/admin-menu.php';
 
-// 5. Memuat Native SEO & Structured Data (JSON-LD)
+// 6. Memuat Native SEO & Structured Data (JSON-LD)
 require_once get_template_directory() . '/inc/seo.php';
diff --git a/header.php b/header.php
index 6e2c8e8..0d4a87c 100644
--- a/header.php
+++ b/header.php
@@ -1,3 +1,4 @@
+<?php defined( 'ABSPATH' ) || exit; ?>
 <!DOCTYPE html>
 <html <?php language_attributes(); ?>>
 <head>
diff --git a/inc/admin-menu.php b/inc/admin-menu.php
index 6a05141..41d37d5 100644
--- a/inc/admin-menu.php
+++ b/inc/admin-menu.php
@@ -3,6 +3,8 @@
  * Modul Pengaturan Menu Admin, Toolbar, dan Settings API EduKarsa
  */
 
+defined( 'ABSPATH' ) || exit;
+
 function edukarsa_admin_menu() {
     add_menu_page( 
         'EduKarsa', 
@@ -43,36 +45,77 @@ function edukarsa_admin_bar_shortcut( $wp_admin_bar ) {
 }
 add_action( 'admin_bar_menu', 'edukarsa_admin_bar_shortcut', 80 );
 
+// SANITASI CHECKBOX (BOOLEAN ENFORCEMENT)
+function edukarsa_sanitize_checkbox( $val ) {
+    return ( ! empty( $val ) && ( $val === 1 || $val === '1' || $val === true ) ) ? 1 : 0;
+}
+
+// REGISTRASI SELURUH PENGATURAN DENGAN SANITASI KETAT
 function edukarsa_register_settings() {
-    $options = array(
-        'edukarsa_font_choice', 'edukarsa_primary_color', 'edukarsa_secondary_color', 'edukarsa_heading_color',
+    // 1. Toggles & Checkboxes
+    $checkboxes = array(
         'edukarsa_tampil_bilingual', 'edukarsa_lang_en', 'edukarsa_lang_ar', 'edukarsa_lang_zh', 'edukarsa_lang_ja',
-        'edukarsa_tampil_accessibility',
-        'edukarsa_tampil_slider', 'edukarsa_tampil_stats', 'edukarsa_tampil_about', 'edukarsa_tampil_milestone', 'edukarsa_tampil_program', 'edukarsa_tampil_video', 'edukarsa_tampil_keunggulan', 'edukarsa_tampil_cta', 'edukarsa_tampil_faq', 'edukarsa_tampil_news',
-        'edukarsa_header_logo',
-        'edukarsa_milestone_subtitle', 'edukarsa_milestone_title',
-        'edukarsa_program_subtitle', 'edukarsa_program_title',
-        'edukarsa_keunggulan_subtitle', 'edukarsa_keunggulan_title',
-        'edukarsa_faq_subtitle', 'edukarsa_faq_title',
-        'edukarsa_news_title',
+        'edukarsa_tampil_accessibility', 'edukarsa_tampil_slider', 'edukarsa_tampil_stats', 'edukarsa_tampil_about',
+        'edukarsa_tampil_milestone', 'edukarsa_tampil_program', 'edukarsa_tampil_video', 'edukarsa_tampil_keunggulan',
+        'edukarsa_tampil_cta', 'edukarsa_tampil_faq', 'edukarsa_tampil_news', 'edukarsa_sidebar_tampil_search',
+        'edukarsa_sidebar_tampil_cta', 'edukarsa_sidebar_tampil_html', 'edukarsa_sidebar_tampil_recent',
+        'edukarsa_sidebar_tampil_cats', 'edukarsa_tampil_fb', 'edukarsa_tampil_ig', 'edukarsa_tampil_yt',
+        'edukarsa_tampil_tiktok', 'edukarsa_tampil_x'
+    );
+    foreach ( $checkboxes as $cb ) {
+        register_setting( 'edukarsa_settings_group', $cb, array( 'sanitize_callback' => 'edukarsa_sanitize_checkbox' ) );
+    }
+
+    // 2. Colors
+    $colors = array( 'edukarsa_primary_color', 'edukarsa_secondary_color', 'edukarsa_heading_color', 'edukarsa_mid_bg_color' );
+    foreach ( $colors as $col ) {
+        register_setting( 'edukarsa_settings_group', $col, array( 'sanitize_callback' => 'sanitize_hex_color' ) );
+    }
+
+    // 3. URLs
+    $urls = array(
+        'edukarsa_header_logo', 'edukarsa_foto_kepsek', 'edukarsa_link_about', 'edukarsa_mid_bg_image',
+        'edukarsa_video1_thumb', 'edukarsa_video1_url', 'edukarsa_video2_thumb', 'edukarsa_video2_url',
+        'edukarsa_cta_bg', 'edukarsa_cta_btn_url', 'edukarsa_sidebar_cta_btn_url', 'edukarsa_sidebar_banner_img',
+        'edukarsa_sidebar_banner_url', 'edukarsa_footer_logo', 'edukarsa_footer_fb', 'edukarsa_footer_ig',
+        'edukarsa_footer_yt', 'edukarsa_footer_tiktok', 'edukarsa_footer_x'
+    );
+    foreach ( $urls as $url ) {
+        register_setting( 'edukarsa_settings_group', $url, array( 'sanitize_callback' => 'esc_url_raw' ) );
+    }
+
+    // 4. Numbers & Integers
+    register_setting( 'edukarsa_settings_group', 'edukarsa_sidebar_recent_count', array( 'sanitize_callback' => 'absint' ) );
+
+    // 5. Emails
+    register_setting( 'edukarsa_settings_group', 'edukarsa_footer_email', array( 'sanitize_callback' => 'sanitize_email' ) );
+
+    // 6. Safe HTML Textareas
+    $safe_html = array(
+        'edukarsa_teks_sambutan', 'edukarsa_sidebar_html_content', 'edukarsa_footer_alamat',
+        'edukarsa_footer_jam', 'edukarsa_footer_desc'
+    );
+    foreach ( $safe_html as $html ) {
+        register_setting( 'edukarsa_settings_group', $html, array( 'sanitize_callback' => 'wp_kses_post' ) );
+    }
+
+    // 7. General Text Inputs
+    $text_inputs = array(
+        'edukarsa_font_choice', 'edukarsa_milestone_subtitle', 'edukarsa_milestone_title',
+        'edukarsa_program_subtitle', 'edukarsa_program_title', 'edukarsa_keunggulan_subtitle',
+        'edukarsa_keunggulan_title', 'edukarsa_faq_subtitle', 'edukarsa_faq_title', 'edukarsa_news_title',
         'edukarsa_stat1_angka', 'edukarsa_stat1_label', 'edukarsa_stat1_desc', 'edukarsa_stat1_icon',
         'edukarsa_stat2_angka', 'edukarsa_stat2_label', 'edukarsa_stat2_desc', 'edukarsa_stat2_icon',
         'edukarsa_stat3_angka', 'edukarsa_stat3_label', 'edukarsa_stat3_desc', 'edukarsa_stat3_icon',
-        'edukarsa_foto_kepsek', 'edukarsa_nama_kepsek', 'edukarsa_subtitle_about', 'edukarsa_teks_sambutan', 'edukarsa_link_about',
-        'edukarsa_video1_thumb', 'edukarsa_video1_url', 'edukarsa_video2_thumb', 'edukarsa_video2_url',
-        'edukarsa_mid_bg_image', 'edukarsa_mid_bg_color',
-        'edukarsa_cta_bg', 'edukarsa_cta_title', 'edukarsa_cta_btn_teks', 'edukarsa_cta_btn_url',
-        'edukarsa_sidebar_tampil_search', 'edukarsa_sidebar_tampil_cta', 'edukarsa_sidebar_cta_badge', 'edukarsa_sidebar_cta_title', 'edukarsa_sidebar_cta_desc', 'edukarsa_sidebar_cta_btn_text', 'edukarsa_sidebar_cta_btn_url',
-        'edukarsa_sidebar_tampil_html', 'edukarsa_sidebar_html_title', 'edukarsa_sidebar_html_content',
-        'edukarsa_sidebar_tampil_recent', 'edukarsa_sidebar_recent_title', 'edukarsa_sidebar_recent_count',
-        'edukarsa_sidebar_tampil_cats', 'edukarsa_sidebar_cats_title',
-        'edukarsa_sidebar_banner_img', 'edukarsa_sidebar_banner_url',
-        'edukarsa_footer_logo', 'edukarsa_footer_desc', 'edukarsa_footer_alamat', 'edukarsa_footer_telp', 'edukarsa_footer_email', 'edukarsa_footer_jam',
-        'edukarsa_wa_btn_text', 'edukarsa_wa_default_msg',
-        'edukarsa_tampil_fb', 'edukarsa_footer_fb', 'edukarsa_tampil_ig', 'edukarsa_footer_ig', 'edukarsa_tampil_yt', 'edukarsa_footer_yt', 'edukarsa_tampil_tiktok', 'edukarsa_footer_tiktok', 'edukarsa_tampil_x', 'edukarsa_footer_x',
-        'edukarsa_footer_copyright', 'edukarsa_custom_css'
+        'edukarsa_nama_kepsek', 'edukarsa_subtitle_about', 'edukarsa_cta_title', 'edukarsa_cta_btn_teks',
+        'edukarsa_sidebar_cta_badge', 'edukarsa_sidebar_cta_title', 'edukarsa_sidebar_cta_desc',
+        'edukarsa_sidebar_cta_btn_text', 'edukarsa_sidebar_html_title', 'edukarsa_sidebar_recent_title',
+        'edukarsa_sidebar_cats_title', 'edukarsa_footer_telp', 'edukarsa_wa_btn_text',
+        'edukarsa_wa_default_msg', 'edukarsa_footer_copyright'
     );
-    foreach ( $options as $opt ) { register_setting( 'edukarsa_settings_group', $opt ); }
+    foreach ( $text_inputs as $txt ) {
+        register_setting( 'edukarsa_settings_group', $txt, array( 'sanitize_callback' => 'sanitize_text_field' ) );
+    }
 }
 add_action( 'admin_init', 'edukarsa_register_settings' );
 
@@ -169,8 +212,6 @@ function edukarsa_settings_page_html() {
     </style>
 
     <div class="wrap edukarsa-admin-wrap">
-        
-        <!-- HEADER TOPBAR: JUDUL + INSTANT DASHBOARD LANGUAGE SWITCHER -->
         <div class="edukarsa-top-toolbar">
             <h1 style="font-weight: 800; font-size: 24px; margin: 0;">
                 <?php echo esc_html( edukarsa_t( 'Pengaturan Tema EduKarsa', 'EduKarsa Theme Settings' ) ); ?>
@@ -190,7 +231,6 @@ function edukarsa_settings_page_html() {
             <?php settings_fields( 'edukarsa_settings_group' ); ?>
 
             <div class="edukarsa-admin-layout">
-                
                 <div class="edukarsa-admin-main">
                     <div class="edukarsa-top-toolbar" style="justify-content: flex-end; margin-bottom: 12px;">
                         <div class="edukarsa-accordion-actions">
@@ -771,7 +811,6 @@ function edukarsa_about_page_html() {
     if ( ! current_user_can( 'manage_options' ) ) return;
     ?>
     <div class="wrap edukarsa-admin-wrap" style="max-width: 1000px; margin-top: 20px;">
-        
         <div style="background: linear-gradient(135deg, #0f2b5c 0%, #1a73e8 100%); color: #ffffff; padding: 45px 40px; border-radius: 16px; box-shadow: 0 15px 35px rgba(15,43,92,0.18); margin-bottom: 30px; position: relative; overflow: hidden;">
             <div style="position: absolute; top: -20px; right: -20px; font-size: 140px; opacity: 0.08; font-weight: 900; user-select: none;">🎓</div>
             <span style="display: inline-block; background: rgba(255,255,255,0.2); padding: 4px 14px; border-radius: 20px; font-size: 11px; font-weight: 800; letter-spacing: 1px; text-transform: uppercase; margin-bottom: 15px;"><?php echo esc_html( edukarsa_t( 'WordPress Theme Khusus Sekolah & Kampus', 'Dedicated WordPress Theme for Schools & Universities' ) ); ?></span>
@@ -862,7 +901,6 @@ function edukarsa_about_page_html() {
                 </div>
             </div>
         </div>
-
     </div>
     <?php
 }
diff --git a/inc/cpt-slider.php b/inc/cpt-slider.php
index 4a93967..2024b11 100644
--- a/inc/cpt-slider.php
+++ b/inc/cpt-slider.php
@@ -1,3 +1,4 @@
+<?php defined( 'ABSPATH' ) || exit; ?>
 <?php
 /**
  * Registrasi Seluruh Custom Post Type (CPT) Native EduKarsa
diff --git a/inc/i18n.php b/inc/i18n.php
index 4d45860..3602396 100644
--- a/inc/i18n.php
+++ b/inc/i18n.php
@@ -1,3 +1,4 @@
+<?php defined( 'ABSPATH' ) || exit; ?>
 <?php
 /**
  * Modul Native Internationalization (i18n) Dashboard EduKarsa
diff --git a/inc/security.php b/inc/security.php
new file mode 100644
index 0000000..038cd2a
--- /dev/null
+++ b/inc/security.php
@@ -0,0 +1,73 @@
+<?php
+/**
+ * Modul Pengamanan Native Tema EduKarsa
+ * Mencegah XSS, SQLi, Clickjacking, User Harvesting, dan Information Leakage
+ */
+
+defined( 'ABSPATH' ) || exit;
+
+// 1. INJEKSI NATIVE HTTP SECURITY HEADERS
+function edukarsa_security_headers() {
+    if ( ! is_admin() ) {
+        header( 'X-Content-Type-Options: nosniff' );
+        header( 'X-Frame-Options: SAMEORIGIN' );
+        header( 'X-XSS-Protection: 1; mode=block' );
+        header( 'Referrer-Policy: strict-origin-when-cross-origin' );
+    }
+}
+add_action( 'send_headers', 'edukarsa_security_headers' );
+
+// 2. INFORMATION DISCLOSURE CLOAKING (SEMBUNYIKAN GENERATOR VERSI CMS)
+function edukarsa_clean_header_fingerprints() {
+    remove_action( 'wp_head', 'wp_generator' );
+    remove_action( 'wp_head', 'wlwmanifest_link' );
+    remove_action( 'wp_head', 'rsd_link' );
+    remove_action( 'wp_head', 'wp_shortlink_wp_head' );
+    remove_action( 'wp_head', 'adjacent_posts_rel_link_wp_head', 10 );
+}
+add_action( 'init', 'edukarsa_clean_header_fingerprints' );
+
+// Hapus query string versi WordPress dari aset agar tidak terbaca bot scanner
+function edukarsa_hide_wp_version_from_assets( $src ) {
+    global $wp_version;
+    parse_str( (string) wp_parse_url( $src, PHP_URL_QUERY ), $query );
+    if ( ! empty( $query['ver'] ) && $query['ver'] === $wp_version ) {
+        $src = remove_query_arg( 'ver', $src );
+    }
+    return $src;
+}
+add_filter( 'style_loader_src', 'edukarsa_hide_wp_version_from_assets', 9999 );
+add_filter( 'script_loader_src', 'edukarsa_hide_wp_version_from_assets', 9999 );
+
+// 3. BLOKIR PROBING USERNAME / ENUMERASI AUTHOR (?author=N)
+function edukarsa_block_author_enumeration() {
+    if ( ! is_admin() && isset( $_REQUEST['author'] ) ) {
+        wp_safe_redirect( home_url( '/' ), 301 );
+        exit;
+    }
+}
+add_action( 'template_redirect', 'edukarsa_block_author_enumeration' );
+
+// 4. BATASI ENDPOINT REST API USERS BAGI PENGUNJUNG TANPA OTENTIKASI
+function edukarsa_restrict_rest_users_endpoint( $endpoints ) {
+    if ( ! is_user_logged_in() ) {
+        if ( isset( $endpoints['/wp/v2/users'] ) ) {
+            unset( $endpoints['/wp/v2/users'] );
+        }
+        if ( isset( $endpoints['/wp/v2/users/(?P<id>[\d]+)'] ) ) {
+            unset( $endpoints['/wp/v2/users/(?P<id>[\d]+)'] );
+        }
+    }
+    return $endpoints;
+}
+add_filter( 'rest_endpoints', 'edukarsa_restrict_rest_users_endpoint' );
+
+// 5. SANITASI INPUT PENCARIAN (ANTI-REFLECTED XSS)
+function edukarsa_sanitize_search_query( $query ) {
+    if ( ! is_admin() && $query->is_main_query() && $query->is_search() ) {
+        $s = $query->get( 's' );
+        $query->set( 's', sanitize_text_field( $s ) );
+    }
+    return $query;
+}
+add_action( 'pre_get_posts', 'edukarsa_sanitize_search_query' );
diff --git a/inc/seo.php b/inc/seo.php
index e74d3fe..586ee71 100644
--- a/inc/seo.php
+++ b/inc/seo.php
@@ -1,3 +1,4 @@
+<?php defined( 'ABSPATH' ) || exit; ?>
 <?php
 /**
  * Modul Native SEO & Structured Data Schema EduKarsa
diff --git a/inc/setup.php b/inc/setup.php
index c2ae55a..db5a51a 100644
--- a/inc/setup.php
+++ b/inc/setup.php
@@ -1,3 +1,4 @@
+<?php defined( 'ABSPATH' ) || exit; ?>
 <?php
 /**
  * File ini menangani dukungan tema (Theme Support) dan antrean aset (CSS/JS).
diff --git a/index.php b/index.php
index e908549..b55d3be 100644
--- a/index.php
+++ b/index.php
@@ -1,3 +1,4 @@
+<?php defined( 'ABSPATH' ) || exit; ?>
 <?php
 /**
  * File template fallback dan daftar arsip berita/artikel.
diff --git a/page.php b/page.php
index 5aa8229..3701ff0 100644
--- a/page.php
+++ b/page.php
@@ -1,3 +1,4 @@
+<?php defined( 'ABSPATH' ) || exit; ?>
 <?php
 /**
  * Template Halaman Statis (Page) EduKarsa
diff --git a/sidebar.php b/sidebar.php
index a62b29c..b2e9941 100644
--- a/sidebar.php
+++ b/sidebar.php
@@ -1,3 +1,4 @@
+<?php defined( 'ABSPATH' ) || exit; ?>
 <?php
 /**
  * Template Sidebar Native EduKarsa
diff --git a/single-program.php b/single-program.php
index 538e92f..4d53e73 100644
--- a/single-program.php
+++ b/single-program.php
@@ -1,3 +1,4 @@
+<?php defined( 'ABSPATH' ) || exit; ?>
 <?php
 /**
  * Template untuk Detail Program Akademik / Unggulan
diff --git a/single.php b/single.php
index 4eb5e85..734520e 100644
--- a/single.php
+++ b/single.php
@@ -1,3 +1,4 @@
+<?php defined( 'ABSPATH' ) || exit; ?>
 <?php
 /**
  * Template Baca Artikel Penuh (Single Post) EduKarsa