diff --git a/2048_Audio.js b/2048_Audio.js
index 807377b..39ac26e 100644
--- a/2048_Audio.js
+++ b/2048_Audio.js
@@ -1,25 +1,43 @@
-/* ------------------------
-   2. AUDIO MANAGER
-   ------------------------ */
+/* ==========================================
+   2048 AUDIO - SOUND MANAGEMENT SYSTEM
+   ========================================== 
+   fitur:
+   1. 3 Audio objects (bg, pop, merge)
+   2. Volume control terpisah untuk setiap audio
+   3. Icon dinamis sesuai level volume
+   4. Panel volume dengan inputLock integration
+   ========================================== */
+
+/* ==========================================
+   AUDIO OBJECTS
+   ========================================== */
 const audio = {
-  bg: new Audio("Background_Music.mp3"),
-  pop: new Audio("Pop.mp3"),
-  merge: new Audio("Merge.mp3")
+  bg: new Audio("Background_Music.mp3"),    // Background music
+  pop: new Audio("Pop.mp3"),                // Sound saat tile spawn
+  merge: new Audio("Merge.mp3")             // Sound saat tile merge
 };
 
-audio.bg.loop = true;
+audio.bg.loop = true; // Background music loop terus
 
-// Update audio volumes based on state & sliders
+/* ==========================================
+   UPDATE VOLUME DARI STATE & SLIDERS
+   ========================================== */
 function updateAudioVolumes() {
+  // Formula: volume = enabled ? (slider / 100) : 0
   audio.bg.volume = soundState.bg ? (volumeState.music / 100) : 0;
   audio.pop.volume = soundState.pop ? (volumeState.pop / 100) : 0;
   audio.merge.volume = soundState.merge ? (volumeState.merge / 100) : 0;
 }
 
+/* ==========================================
+   PLAY BACKGROUND MUSIC (dengan unlock)
+   ========================================== */
 function tryPlayBg() {
   if (!soundState.bg || volumeState.music === 0) return;
   
+  // Coba play, kalau di-block browser (autoplay policy)
   audio.bg.play().catch(() => {
+    // Setup unlock: tunggu user interaction
     const unlock = () => {
       if (soundState.bg && volumeState.music > 0) audio.bg.play().catch(()=>{});
       window.removeEventListener("keydown", unlock);
@@ -30,19 +48,24 @@ function tryPlayBg() {
   });
 }
 
-/* Safe playSound with mute check */
+/* ==========================================
+   PLAY SOUND (dengan mute check)
+   ========================================== */
 function playSound(soundObj) {
   try {
+    // Guard: cek mute state sebelum play
     if (soundObj === audio.pop && (!soundState.pop || volumeState.pop === 0)) return;
     if (soundObj === audio.merge && (!soundState.merge || volumeState.merge === 0)) return;
     if (soundObj === audio.bg && (!soundState.bg || volumeState.music === 0)) return;
     
-    soundObj.currentTime = 0;
-    soundObj.play().catch(() => {});
+    soundObj.currentTime = 0; // Restart dari awal
+    soundObj.play().catch(() => {}); // Play with error handling
   } catch (e) {}
 }
 
-// Initialize Volume Sliders
+/* ==========================================
+   INIT VOLUME SLIDERS - Setup Event Listeners
+   ========================================== */
 function initVolumeControl() {
   updateAudioVolumes();
   
@@ -50,28 +73,33 @@ function initVolumeControl() {
   const popSlider = document.getElementById('vol-pop');
   const mergeSlider = document.getElementById('vol-merge');
   
+  /* --- MUSIC SLIDER --- */
   if (musicSlider) {
+    // Load nilai dari localStorage
     musicSlider.value = volumeState.music;
     updateSliderFill(musicSlider, volumeState.music);
     document.getElementById('vol-music-display').textContent = volumeState.music + '%';
     
+    // Event listener saat slider digeser
     musicSlider.addEventListener('input', (e) => {
       const val = parseInt(e.target.value);
-      volumeState.music = val;
-      audio.bg.volume = val / 100; // Direct update
-      localStorage.setItem('vol_music', val);
+      volumeState.music = val;           // Update state
+      audio.bg.volume = val / 100;        // Set volume langsung
+      localStorage.setItem('vol_music', val); // Save ke browser
       document.getElementById('vol-music-display').textContent = val + '%';
-      updateSliderFill(e.target, val);
-      updateMainSoundIcon();
+      updateSliderFill(e.target, val);    // Update visual fill
+      updateMainSoundIcon();              // Update icon
       
+      // Auto play/pause background music
       if (val > 0 && audio.bg.paused && soundState.bg) {
-        tryPlayBg();
+        tryPlayBg(); // Play kalau volume > 0
       } else if (val === 0) {
-        audio.bg.pause();
+        audio.bg.pause(); // Pause kalau volume = 0 (muted)
       }
     });
   }
   
+  /* --- POP SLIDER (sama seperti music) --- */
   if (popSlider) {
     popSlider.value = volumeState.pop;
     updateSliderFill(popSlider, volumeState.pop);
@@ -88,6 +116,7 @@ function initVolumeControl() {
     });
   }
   
+  /* --- MERGE SLIDER (sama seperti music) --- */
   if (mergeSlider) {
     mergeSlider.value = volumeState.merge;
     updateSliderFill(mergeSlider, volumeState.merge);
@@ -105,86 +134,110 @@ function initVolumeControl() {
   }
   
   updateMainSoundIcon();
-  setupVolumePanelEvents();
+  setupVolumePanelEvents(); // Setup panel interactions
 }
 
+/* ==========================================
+   SETUP PANEL EVENTS - Open/Close Logic
+   ========================================== 
+   Ini yang nge-link dengan inputLocked di Controls
+   ========================================== */
 function setupVolumePanelEvents() {
     const btnSoundMain = document.getElementById('btn-sound-main');
     const volumePanel = document.getElementById('volume-panel');
     const volumeBackdrop = document.getElementById('volume-backdrop');
     
     if (btnSoundMain && volumePanel) {
+      // Event: Klik tombol sound main
       btnSoundMain.addEventListener('click', (e) => {
-        e.stopPropagation();
+        e.stopPropagation(); // Jangan trigger event di parent
         const isActive = volumePanel.classList.contains('active');
         
         if (isActive) {
+          // TUTUP PANEL
           volumePanel.classList.remove('active');
-        if (volumeBackdrop) volumeBackdrop.classList.remove('active');
-          inputLocked = false; // 🔓 buka panel -> input kembali
+          if (volumeBackdrop) volumeBackdrop.classList.remove('active');
+          inputLocked = false; //  UNLOCK - game input aktif lagi
         } else {
+          // BUKA PANEL
           volumePanel.classList.add('active');
           if (volumeBackdrop) volumeBackdrop.classList.add('active');
-          inputLocked = true;  // 🔒 panel sound aktif -> swipe & keyboard mati
+          inputLocked = true;  //  LOCK - blokir swipe & keyboard
         }
       });
       
-      // Close when clicking backdrop
+      // Event: Klik backdrop (tutup panel)
       volumeBackdrop.addEventListener('click', () => {
         volumePanel.classList.remove('active');
         volumeBackdrop.classList.remove('active');
-        inputLocked = false; // 🔓 unlock
-        });
-
+        inputLocked = false; //  UNLOCK
+      });
       
-      // Close when clicking outside (desktop)
+      // Event: Klik di luar panel (desktop)
       document.addEventListener('click', (e) => {
         if (!volumePanel.contains(e.target) && 
             !btnSoundMain.contains(e.target) &&
             (!volumeBackdrop || !volumeBackdrop.contains(e.target))) {
           volumePanel.classList.remove('active');
           if (volumeBackdrop) volumeBackdrop.classList.remove('active');
-          inputLocked = false; // 🔓 unlock input
+          inputLocked = false; //  UNLOCK
         }
       });
       
+      // Event: Klik di dalam panel (jangan tutup)
       volumePanel.addEventListener('click', (e) => {
-        e.stopPropagation();
+        e.stopPropagation(); // Prevent close
       });
     }
 }
 
+/* ==========================================
+   UPDATE VISUAL FILL SLIDER
+   ========================================== */
 function updateSliderFill(slider, value) {
+  // Set CSS custom property untuk animasi fill
+  // Dipakai di CSS: background: linear-gradient(...)
   slider.style.setProperty('--value', value + '%');
 }
 
+/* ==========================================
+   UPDATE ICON DINAMIS - Sesuai Volume Level
+   ========================================== */
 function updateMainSoundIcon() {
   const btnMain = document.getElementById('btn-sound-main');
   if (!btnMain) return;
   
+  // Ambil semua icon
   const iconFull = btnMain.querySelector('.sound-full');
   const iconMedium = btnMain.querySelector('.sound-medium');
   const iconLow = btnMain.querySelector('.sound-low');
   const iconMuted = btnMain.querySelector('.sound-muted');
   
+  // Hitung rata-rata volume dari 3 slider
   const totalVolume = volumeState.music + volumeState.pop + volumeState.merge;
   const avgVolume = totalVolume / 3;
   
+  // Hide semua icon dulu
   if (iconFull) iconFull.style.display = 'none';
   if (iconMedium) iconMedium.style.display = 'none';
   if (iconLow) iconLow.style.display = 'none';
   if (iconMuted) iconMuted.style.display = 'none';
   
+  // Show icon yang sesuai dengan level volume
   if (totalVolume === 0) {
+    // Semua muted
     if (iconMuted) iconMuted.style.display = 'block';
     btnMain.classList.add('all-muted');
   } else {
     btnMain.classList.remove('all-muted');
     if (avgVolume >= 60) {
+      // Volume tinggi (≥60%)
       if (iconFull) iconFull.style.display = 'block';
     } else if (avgVolume >= 30) {
+      // Volume sedang (30-59%)
       if (iconMedium) iconMedium.style.display = 'block';
     } else {
+      // Volume rendah (1-29%)
       if (iconLow) iconLow.style.display = 'block';
     }
   }
diff --git a/2048_Floating_Particles.js b/2048_Floating_Particles.js
index c08ce20..1a520fb 100644
--- a/2048_Floating_Particles.js
+++ b/2048_Floating_Particles.js
@@ -1,48 +1,75 @@
+/* ==========================================
+   2048 FLOATING PARTICLES - BACKGROUND DECORATION
+   ========================================== 
+   fungsi
+   - createParticle() - Buat partikel yang naik dari bawah
+   - Self-recycling system (partikel hilang → buat baru)
+   - Efek drift horizontal untuk gerakan natural
+   ========================================== */
+
 // Floating Particles System - Particles rising from bottom
 (function() {
+    // Ambil container untuk partikel
     const container = document.getElementById('floating-particles');
-    if (!container) return;
-
+    if (!container) return; // Guard: kalau container nggak ada, skip
+    
+    // Config warna partikel (5 warna neon)
     const particleColors = ['cyan', 'pink', 'purple', 'green', 'orange'];
-    const particleCount = 25; // Number of particles
+    const particleCount = 25; // Total partikel yang muncul
 
+    /* ==========================================
+       CREATE PARTICLE - Buat 1 partikel
+       ========================================== */
     function createParticle() {
+        // Buat element div untuk partikel
         const particle = document.createElement('div');
-        particle.className = `floating-particle ${particleColors[Math.floor(Math.random() * particleColors.length)]}`;
         
-        // Random horizontal position
+        // Pilih warna random dari array
+        const randomColor = particleColors[Math.floor(Math.random() * particleColors.length)];
+        particle.className = `floating-particle ${randomColor}`;
+        
+        //  POSISI HORIZONTAL RANDOM (0-100%)
         const leftPos = Math.random() * 100;
         particle.style.left = leftPos + '%';
         
-        // Random drift amount (horizontal movement during float)
-        const drift = (Math.random() - 0.5) * 150; // -75px to +75px
+        //  DRIFT HORIZONTAL (gerakan ke kiri/kanan saat naik)
+        // Range: -75px sampai +75px
+        const drift = (Math.random() - 0.5) * 150;
         particle.style.setProperty('--drift', drift + 'px');
         
-        // Random animation duration (slower = more dramatic)
-        const duration = 8 + Math.random() * 10; // 8-18 seconds
+        //  DURASI ANIMASI RANDOM (8-18 detik)
+        // Semakin lama = semakin smooth & dramatis
+        const duration = 8 + Math.random() * 10;
         particle.style.animationDuration = duration + 's';
         
-        // Random delay for staggered effect
+        //  DELAY RANDOM (0-5 detik)
+        // Biar nggak semua partikel muncul bareng (staggered)
         const delay = Math.random() * 5;
         particle.style.animationDelay = delay + 's';
         
-        // Random size variation
-        const size = 6 + Math.random() * 8; // 6-14px
+        //  UKURAN RANDOM (6-14px)
+        const size = 6 + Math.random() * 8;
         particle.style.width = size + 'px';
         particle.style.height = size + 'px';
         
+        // Append ke container
         container.appendChild(particle);
         
-        // Remove and recreate after animation completes
+        // ♻️ SELF-RECYCLING SYSTEM
+        // Setelah animasi selesai → hapus & buat baru
         setTimeout(() => {
-            particle.remove();
-            createParticle();
-        }, (duration + delay) * 1000);
+            particle.remove(); // Hapus partikel lama
+            createParticle(); // Buat partikel baru (infinite loop)
+        }, (duration + delay) * 1000); // Total waktu = duration + delay
     }
 
-    // Initialize particles
+    /* ==========================================
+       INITIALIZE - Buat semua partikel awal
+       ========================================== */
+    // Loop buat 25 partikel
     for (let i = 0; i < particleCount; i++) {
-        // Stagger initial creation
+        // Stagger creation: jeda 200ms per partikel
+        // Biar nggak semua muncul sekaligus (smooth)
         setTimeout(() => createParticle(), i * 200);
     }
-})();
\ No newline at end of file
+})(); // IIFE (Immediately Invoked Function Expression) - langsung jalan
\ No newline at end of file
diff --git a/2048_Visual_Effects.js b/2048_Visual_Effects.js
index e09c380..c0f2af4 100644
--- a/2048_Visual_Effects.js
+++ b/2048_Visual_Effects.js
@@ -1,23 +1,42 @@
-/* ------------------------
-   3. VISUAL EFFECTS
-   ------------------------ */
+/* ==========================================
+   2048 VISUAL EFFECTS - ANIMATION SYSTEM
+   ========================================== 
+   fungsi utama:
+   1. triggerComboEffect() - Efek saat tile merge
+   2. showComboPopup() - Popup combo text (x2, x3, x4+)
+   3. createParticleBurst() - Ledakan partikel dari tile
+   4. createScorePopup() - Score yang terbang ke atas
+   5. getTileColor() - Warna sesuai nilai tile
+   ========================================== */
+
+/* ==========================================
+   TRIGGER COMBO EFFECT - Main Visual Handler
+   ========================================== 
+   Dipanggil dari move functions di 2048_Logic.js
+   ========================================== */
 function triggerComboEffect(mergedCells, comboCount) {
+  // Guard: kalau nggak ada tile yang merge, skip
   if (mergedCells.length === 0) return;
   
+  // Loop setiap tile yang di-merge
   mergedCells.forEach(cell => {
     const tile = document.getElementById(`${cell.r}-${cell.c}`);
     if (!tile) return;
     
+    // Efek 1: Animasi "merge" (scale + glow)
     tile.classList.add('merge');
     setTimeout(() => tile.classList.remove('merge'), 300);
     
+    // Efek 2: Ledakan partikel
     createParticleBurst(tile);
     
+    // Efek 3: Box shadow glow
     tile.style.boxShadow = '0 0 40px currentColor';
     setTimeout(() => {
-      tile.style.boxShadow = '';
+      tile.style.boxShadow = ''; // Reset setelah 300ms
     }, 300);
     
+    // Efek 4: Score popup yang terbang ke atas
     const rect = tile.getBoundingClientRect();
     const centerX = rect.left + rect.width / 2;
     const centerY = rect.top + rect.height / 2;
@@ -25,42 +44,54 @@ function triggerComboEffect(mergedCells, comboCount) {
     createScorePopup(centerX, centerY, tileValue);
   });
   
+  // Efek 5: Combo popup kalau merge ≥2 tile sekaligus
   if (comboCount >= 2) {
     showComboPopup(comboCount);
   }
 }
 
+/* ==========================================
+   COMBO POPUP - Text "COMBO x2!", "AMAZING x3!", dst
+   ========================================== */
 function showComboPopup(comboCount) {
   const board = document.getElementById('board');
   if (!board) return;
   
+  // Hitung posisi tengah board
   const rect = board.getBoundingClientRect();
   const centerX = rect.left + rect.width / 2;
   const centerY = rect.top + rect.height / 2;
   
+  // Buat element popup
   const popup = document.createElement('div');
   popup.className = 'combo-popup';
   popup.style.left = centerX + 'px';
   popup.style.top = centerY + 'px';
   popup.style.position = 'fixed';
   popup.style.fontWeight = '900';
-  popup.style.pointerEvents = 'none';
-  popup.style.zIndex = '9999';
-  popup.style.transform = 'translate(-50%, -50%)';
+  popup.style.pointerEvents = 'none'; // Nggak bisa diklik
+  popup.style.zIndex = '9999'; // Di depan semua
+  popup.style.transform = 'translate(-50%, -50%)'; // Center alignment
   popup.style.textTransform = 'uppercase';
   popup.style.letterSpacing = '3px';
   
+  // Styling berbeda sesuai combo level
   if (comboCount === 2) {
+    // COMBO x2 - Hijau neon
     popup.textContent = 'COMBO x2!';
     popup.style.fontSize = '36px';
     popup.style.color = '#00ff99';
     popup.style.textShadow = '0 0 30px rgba(0, 255, 153, 1), 0 0 50px rgba(0, 255, 153, 0.5)';
+    
   } else if (comboCount === 3) {
+    // AMAZING x3 - Pink magenta
     popup.textContent = 'AMAZING x3!';
     popup.style.fontSize = '42px';
     popup.style.color = '#ff00ff';
     popup.style.textShadow = '0 0 35px rgba(255, 0, 255, 1), 0 0 60px rgba(255, 0, 255, 0.6)';
+    
   } else if (comboCount >= 4) {
+    // PERFECT x4+ - Gold
     popup.textContent = 'PERFECT x' + comboCount + '!';
     popup.style.fontSize = '48px';
     popup.style.color = '#ffd700';
@@ -69,6 +100,7 @@ function showComboPopup(comboCount) {
   
   document.body.appendChild(popup);
   
+  // Animasi: muncul → bounce → hilang
   popup.animate([
     { transform: 'translate(-50%, -50%) scale(0.3) rotate(-10deg)', opacity: 0 },
     { transform: 'translate(-50%, -50%) scale(1.3) rotate(5deg)', opacity: 1, offset: 0.3 },
@@ -76,54 +108,66 @@ function showComboPopup(comboCount) {
     { transform: 'translate(-50%, -50%) scale(0.8) rotate(0deg)', opacity: 0 }
   ], {
     duration: 1200,
-    easing: 'cubic-bezier(0.34, 1.56, 0.64, 1)'
-  }).onfinish = () => popup.remove();
+    easing: 'cubic-bezier(0.34, 1.56, 0.64, 1)' // Bounce effect
+  }).onfinish = () => popup.remove(); // Auto cleanup
 }
 
+/* ==========================================
+   PARTICLE BURST - Ledakan partikel dari tile
+   ========================================== */
 function createParticleBurst(tileElement) {
+  // Ambil posisi tengah tile
   const rect = tileElement.getBoundingClientRect();
   const centerX = rect.left + rect.width / 2;
   const centerY = rect.top + rect.height / 2;
   
+  // Ambil warna tile sesuai nilainya
   const tileValue = parseInt(tileElement.textContent);
   const tileColor = getTileColor(tileValue);
   
+  // Jumlah partikel random (8-12)
   const particleCount = 8 + Math.floor(Math.random() * 5);
   
+  // Buat partikel dalam lingkaran (360°)
   for (let i = 0; i < particleCount; i++) {
     const particle = document.createElement('div');
     particle.className = 'merge-particle';
     particle.style.left = centerX + 'px';
     particle.style.top = centerY + 'px';
-    particle.style.background = tileColor;
+    particle.style.background = tileColor; // Warna sama dengan tile
     
     document.body.appendChild(particle);
     
+    // Hitung sudut & kecepatan untuk ledakan melingkar
     const angle = (Math.PI * 2 * i) / particleCount + (Math.random() - 0.5) * 0.5;
-    const velocity = 60 + Math.random() * 40;
-    const tx = Math.cos(angle) * velocity;
-    const ty = Math.sin(angle) * velocity;
+    const velocity = 60 + Math.random() * 40; // 60-100px
+    const tx = Math.cos(angle) * velocity; // Posisi X
+    const ty = Math.sin(angle) * velocity; // Posisi Y
     
+    // Animasi: meledak keluar sambil mengecil
     particle.animate([
       { transform: 'translate(0, 0) scale(1)', opacity: 1 },
       { transform: `translate(${tx}px, ${ty}px) scale(0)`, opacity: 0 }
     ], {
-      duration: 500 + Math.random() * 200,
-      easing: 'cubic-bezier(0.25, 0.46, 0.45, 0.94)'
-    }).onfinish = () => particle.remove();
+      duration: 500 + Math.random() * 200, // 500-700ms
+      easing: 'cubic-bezier(0.25, 0.46, 0.45, 0.94)' // Smooth ease-out
+    }).onfinish = () => particle.remove(); // Auto cleanup
   }
 }
 
+/* ==========================================
+   SCORE POPUP - Angka score yang terbang ke atas
+   ========================================== */
 function createScorePopup(x, y, score) {
   const popup = document.createElement('div');
   popup.className = 'score-popup';
-  popup.textContent = '+' + score;
+  popup.textContent = '+' + score; // Contoh: "+16", "+32"
   popup.style.left = x + 'px';
   popup.style.top = y + 'px';
   popup.style.position = 'fixed';
   popup.style.fontSize = '24px';
   popup.style.fontWeight = '900';
-  popup.style.color = '#ffd700';
+  popup.style.color = '#ffd700'; // Gold
   popup.style.textShadow = '0 0 20px rgba(255, 215, 0, 0.8)';
   popup.style.pointerEvents = 'none';
   popup.style.zIndex = '9999';
@@ -131,21 +175,36 @@ function createScorePopup(x, y, score) {
   
   document.body.appendChild(popup);
   
+  // Animasi: terbang ke atas sambil fade out
   popup.animate([
     { transform: 'translate(-50%, -50%) scale(0.5)', opacity: 0 },
     { transform: 'translate(-50%, -70px) scale(1.2)', opacity: 1, offset: 0.3 },
     { transform: 'translate(-50%, -120px) scale(1)', opacity: 0 }
   ], {
     duration: 1000,
-    easing: 'cubic-bezier(0.34, 1.56, 0.64, 1)'
+    easing: 'cubic-bezier(0.34, 1.56, 0.64, 1)' // Bounce ease
   }).onfinish = () => popup.remove();
 }
 
+/* ==========================================
+   GET TILE COLOR - Warna sesuai nilai tile
+   ========================================== 
+   Dipakai untuk partikel biar warnanya match
+   ========================================== */
 function getTileColor(value) {
   const colors = {
-    2: '#00eaff', 4: '#00ff99', 8: '#ff00ff', 16: '#ff0066',
-    32: '#ffaa00', 64: '#ff0000', 128: '#5f00ff', 256: '#00ffea',
-    512: '#ff00aa', 1024: '#00ffaa', 2048: '#ffd700'
+    2: '#00eaff',    // Cyan
+    4: '#00ff99',    // Green
+    8: '#ff00ff',    // Magenta
+    16: '#ff0066',   // Pink
+    32: '#ffaa00',   // Orange
+    64: '#ff0000',   // Red
+    128: '#5f00ff',  // Purple
+    256: '#00ffea',  // Cyan bright
+    512: '#ff00aa',  // Pink bright
+    1024: '#00ffaa', // Green bright
+    2048: '#ffd700'  // Gold (winning tile!)
   };
+  // Return warna sesuai value, default cyan kalau nggak ada
   return colors[value] || '#00eaff';
 }
\ No newline at end of file
diff --git a/Animation_Homepage.js b/Animation_Homepage.js
index 944e56c..c05a115 100644
--- a/Animation_Homepage.js
+++ b/Animation_Homepage.js
@@ -1,7 +1,20 @@
+/* ==========================================
+   ANIMATION HOMEPAGE - Homepage Controller
+   ==========================================
+   fitur utama:
+   1. updateAuthButton() - Toggle LOGIN/LOGOUT button
+   2. handleLogout() - Logout logic dengan PHP
+   3. Event listeners untuk semua button & keyboard
+   4. Smooth scroll & responsive handling
+   ========================================== */
+
+// Animation Homepage.js
 (function() {
     'use strict';
     
-    // ==================== DOM ELEMENTS ====================
+    /* ==========================================
+       DOM ELEMENTS - Cache semua element penting
+       ========================================== */
     const elements = {
         logo: null,
         authBtn: null,
@@ -13,33 +26,37 @@
         logoutFailedOverlay: null
     };
     
-    // ==================== INITIALIZE ====================
+    /* ==========================================
+       INITIALIZE - Setup saat page load
+       ========================================== */
     function init() {
         if (document.readyState === 'loading') {
+            // Kalau DOM belum ready, tunggu event
             document.addEventListener('DOMContentLoaded', initAll);
         } else {
+            // Kalau sudah ready, langsung init
             initAll();
         }
     }
     
     function initAll() {
         try {
-            // Cache DOM elements
+            // Step 1: Cache semua DOM elements
             cacheElements();
             
-            // Validate elements
+            // Step 2: Validasi element wajib ada
             if (!validateElements()) {
                 console.error('Some required elements are missing');
                 return;
             }
             
-            // Setup event listeners
+            // Step 3: Setup event listeners
             setupEventListeners();
             
-            // Initialize smooth scroll
+            // Step 4: Initialize smooth scroll
             initSmoothScroll();
             
-            // Check login status and update button
+            // Step 5: Update button LOGIN/LOGOUT sesuai status
             updateAuthButton();
             
             console.log('✅ Homepage initialized successfully');
@@ -48,7 +65,11 @@
         }
     }
     
-    // ==================== CACHE ELEMENTS ====================
+    /* ==========================================
+       CACHE ELEMENTS - Simpan reference ke variable
+       ========================================== 
+       Kenapa? Biar nggak query DOM berkali-kali (performa)
+       ========================================== */
     function cacheElements() {
         elements.logo = document.querySelector('.logo');
         elements.authBtn = document.getElementById('auth-button');
@@ -60,50 +81,60 @@
         elements.logoutFailedOverlay = document.getElementById('logout-failed-overlay');
     }
     
-    // ==================== VALIDATE ELEMENTS ====================
+    /* ==========================================
+       VALIDATE ELEMENTS - Cek element wajib ada
+       ========================================== */
     function validateElements() {
+        // Element yang HARUS ada: logo, authBtn, playBtn
         const requiredElements = ['logo', 'authBtn', 'playBtn'];
         const missingElements = requiredElements.filter(key => !elements[key]);
         
         if (missingElements.length > 0) {
             console.warn('Missing elements:', missingElements);
-            return false;
+            return false; // Gagal validasi
         }
         
-        return true;
+        return true; // Semua element ada
     }
     
-    // ==================== UPDATE AUTH BUTTON ====================
+    /* ==========================================
+       UPDATE AUTH BUTTON - Toggle LOGIN/LOGOUT
+       ========================================== 
+       Cek dari localStorage & sessionStorage
+       ========================================== */
     function updateAuthButton() {
-        // Cek dari localStorage (authToken & username) atau sessionStorage
+        // Cek apakah user sudah login
+        // 3 cara cek: authToken, username, atau loggedInUser
         const authToken = localStorage.getItem('authToken');
         const username = localStorage.getItem('username');
         const loggedInUser = sessionStorage.getItem('loggedInUser');
         
         if (authToken || username || loggedInUser) {
-            // User is logged in - show LOGOUT button
+            //  User SUDAH LOGIN → show LOGOUT button
             elements.authBtn.textContent = 'LOGOUT';
             elements.authBtn.classList.add('logout-mode');
         } else {
-            // User is not logged in - show LOGIN button
+            //  User BELUM LOGIN → show LOGIN button
             elements.authBtn.textContent = 'LOGIN';
             elements.authBtn.classList.remove('logout-mode');
         }
     }
     
-    // ==================== EVENT LISTENERS ====================
+    /* ==========================================
+       SETUP EVENT LISTENERS - Bind semua event
+       ========================================== */
     function setupEventListeners() {
-        // Logo click - reload page
+        // Logo click → reload homepage
         if (elements.logo) {
             elements.logo.addEventListener('click', handleLogoClick);
         }
         
-        // Auth button (Login/Logout)
+        // Auth button → login/logout
         if (elements.authBtn) {
             elements.authBtn.addEventListener('click', handleAuthClick);
         }
         
-        // Play button
+        // Play button → go to game
         if (elements.playBtn) {
             elements.playBtn.addEventListener('click', handlePlayClick);
         }
@@ -113,7 +144,7 @@
             elements.leaderboardBtn.addEventListener('click', handleLeaderboardClick);
         }
         
-        // Keyboard shortcuts
+        // Keyboard shortcuts (P, L, B)
         document.addEventListener('keydown', handleKeyPress);
         
         // Window events
@@ -121,54 +152,64 @@
         window.addEventListener('beforeunload', handleBeforeUnload);
     }
     
-    // ==================== EVENT HANDLERS ====================
+    /* ==========================================
+       EVENT HANDLERS
+       ========================================== */
+    
     function handleLogoClick(e) {
         e.preventDefault();
         window.location.href = 'Homepage.html';
     }
     
+    /* ==========================================
+       HANDLE AUTH CLICK - Login atau Logout
+       ========================================== */
     function handleAuthClick(e) {
-        // Cek dari localStorage atau sessionStorage
+        // Cek status login dari localStorage & sessionStorage
         const authToken = localStorage.getItem('authToken');
         const username = localStorage.getItem('username');
         const loggedInUser = sessionStorage.getItem('loggedInUser');
         
         if (authToken || username || loggedInUser) {
-            // User is logged in - perform logout
+            // User sudah login → LOGOUT
             handleLogout();
         } else {
-            // User is not logged in - go to login page
+            // User belum login → ke halaman LOGIN
             window.location.href = 'Login.html';
         }
     }
     
+    /* ==========================================
+       HANDLE LOGOUT - Logout Logic dengan PHP
+       ========================================== */
     async function handleLogout() {
         try {
-            // Panggil PHP untuk hapus session
+            // Step 1: Panggil PHP untuk hapus session di server
             const response = await fetch("http://localhost/Kelompok06_2048/Logout.php", {
                 method: "POST"
             });
             
             const data = await response.json();
             
-            // Hapus token & username dari localStorage
+            // Step 2: Hapus token & username dari localStorage
             localStorage.removeItem("authToken");
             localStorage.removeItem("username");
             
-            // Hapus juga dari sessionStorage (jika ada)
+            // Step 3: Hapus juga dari sessionStorage
             sessionStorage.removeItem('loggedInUser');
             sessionStorage.removeItem('showTutorial');
             
-            // Show success modal
+            // Step 4: Show success modal
             if (elements.logoutOverlay) {
                 elements.logoutOverlay.style.display = 'flex';
                 
-                // Auto close after 2 seconds and redirect to homepage
+                // Auto close setelah 2 detik & redirect
                 setTimeout(() => {
                     elements.logoutOverlay.style.display = 'none';
                     window.location.href = "Homepage.html";
                 }, 2000);
             }
+            
         } catch (error) {
             console.error('Logout failed:', error);
             
@@ -182,7 +223,7 @@
             if (elements.logoutFailedOverlay) {
                 elements.logoutFailedOverlay.style.display = 'flex';
                 
-                // Auto close after 2.5 seconds and redirect anyway
+                // Auto close setelah 2.5 detik
                 setTimeout(() => {
                     elements.logoutFailedOverlay.style.display = 'none';
                     window.location.href = "Homepage.html";
@@ -192,31 +233,34 @@
     }
     
     function handlePlayClick(e) {
-        // Allow default behavior (navigate to 2048.html)
+        // Allow default behavior (navigate ke 2048.html)
         console.log('Starting game...');
     }
     
     function handleLeaderboardClick(e) {
-        // Allow default behavior (navigate to leaderboard.html)
+        // Allow default behavior (navigate ke leaderboard.html)
         console.log('Opening leaderboard...');
     }
     
+    /* ==========================================
+       KEYBOARD SHORTCUTS
+       ========================================== */
     function handleKeyPress(e) {
-        // Press 'P' to play
+        // Press 'P' → Play game
         if (e.key === 'p' || e.key === 'P') {
             if (elements.playBtn) {
                 elements.playBtn.click();
             }
         }
         
-        // Press 'L' for login/logout
+        // Press 'L' → Login/Logout
         if (e.key === 'l' || e.key === 'L') {
             if (elements.authBtn) {
                 elements.authBtn.click();
             }
         }
         
-        // Press 'B' for leaderboard
+        // Press 'B' → Leaderboard (Board)
         if (e.key === 'b' || e.key === 'B') {
             if (elements.leaderboardBtn) {
                 elements.leaderboardBtn.click();
@@ -225,7 +269,7 @@
     }
     
     function handleResize() {
-        // Handle responsive behavior if needed
+        // Handle responsive behavior (mobile, tablet, desktop)
         const width = window.innerWidth;
         
         if (width < 768) {
@@ -238,11 +282,13 @@
     }
     
     function handleBeforeUnload(e) {
-        // Cleanup before page unload
+        // Cleanup sebelum page unload
         console.log('Page unloading...');
     }
     
-    // ==================== SMOOTH SCROLL ====================
+    /* ==========================================
+       SMOOTH SCROLL - Untuk anchor links (#)
+       ========================================== */
     function initSmoothScroll() {
         document.querySelectorAll('a[href^="#"]').forEach(anchor => {
             anchor.addEventListener('click', function(e) {
@@ -262,7 +308,9 @@
         });
     }
     
-    // ==================== UTILITY FUNCTIONS ====================
+    /* ==========================================
+       UTILITY FUNCTIONS
+       ========================================== */
     function checkBrowserSupport() {
         const features = {
             localStorage: typeof(Storage) !== 'undefined',
@@ -278,7 +326,9 @@
         return /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent);
     }
     
-    // ==================== PUBLIC API ====================
+    /* ==========================================
+       PUBLIC API - Fungsi yang bisa dipanggil dari luar
+       ========================================== */
     window.Homepage = {
         init: initAll,
         isMobile: isMobile,
@@ -286,9 +336,11 @@
         updateAuthButton: updateAuthButton
     };
     
-    // ==================== CLEANUP ====================
+    /* ==========================================
+       CLEANUP - Remove semua event listener
+       ========================================== */
     window.cleanupHomepage = function() {
-        // Remove event listeners
+        // Remove event listeners (untuk prevent memory leak)
         if (elements.logo) {
             elements.logo.removeEventListener('click', handleLogoClick);
         }
@@ -312,7 +364,7 @@
         console.log('Homepage cleaned up');
     };
     
-    // Start initialization
+    // Start initialization saat script load
     init();
     
-})();
\ No newline at end of file
+})(); // IIFE - langsung execute
\ No newline at end of file
diff --git a/Animation_Login.js b/Animation_Login.js
index 9a24f9f..2354766 100644
--- a/Animation_Login.js
+++ b/Animation_Login.js
@@ -1,81 +1,150 @@
-// Particle System
-const particlesContainer = document.getElementById('particles');
-const particleCount = 150;
-const particles = [];
+/* ==========================================
+   ANIMATION LOGIN - PARTICLE BACKGROUND SYSTEM
+   ========================================== 
+  fungsi:
+   - Class Particle: Objek partikel dengan posisi & kecepatan
+   - Even Distribution: Distribusi partikel merata (15x10 grid)
+   - Animate Loop: Pergerakan smooth dengan requestAnimationFrame
+   ========================================== */
 
+
+/* ==========================================
+   SETUP CONTAINER & CONFIG
+   ========================================== */
+const particlesContainer = document.getElementById('particles');
+const particleCount = 150; // Total partikel yang dibuat
+const particles = []; // Array untuk simpan semua partikel
+
+/* ==========================================
+   CLASS PARTICLE - Blueprint untuk setiap partikel
+   ========================================== 
+   Properties:
+   - x, y: Posisi partikel
+   - vx, vy: Kecepatan horizontal & vertikal (velocity)
+   - size: Ukuran partikel (2-5px)
+   - color: Warna neon random
+   ========================================== */
 class Particle {
     constructor() {
+        // Buat element DOM untuk partikel
         this.element = document.createElement('div');
         this.element.className = 'particle';
-        this.reset();
+        this.reset(); // Initialize posisi & properti
         particlesContainer.appendChild(this.element);
     }
 
+    /* ==========================================
+       RESET - Set/reset properti partikel
+       ========================================== */
     reset() {
+        // Posisi random di seluruh layar
         this.x = Math.random() * window.innerWidth;
         this.y = Math.random() * window.innerHeight;
+        
+        // Kecepatan random (-0.6 sampai +0.6 pixel/frame)
         this.vx = (Math.random() - 0.5) * 1.2;
         this.vy = (Math.random() - 0.5) * 1.2;
+        
+        // Ukuran random (2-5px)
         this.size = Math.random() * 3 + 2;
 
+        // Array warna neon untuk partikel
         const colors = [
-            '#00d9ff', '#ff00ff', '#00ffff',
-            '#ff0080', '#9d00ff', '#00ff88'
+            '#00d9ff', // Cyan
+            '#ff00ff', // Magenta
+            '#00ffff', // Cyan bright
+            '#ff0080', // Pink
+            '#9d00ff', // Purple
+            '#00ff88'  // Green
         ];
 
+        // Pilih warna random dari array
         const color = colors[Math.floor(Math.random() * colors.length)];
         this.element.style.background = color;
-        this.element.style.boxShadow = `0 0 15px ${color}`;
+        this.element.style.boxShadow = `0 0 15px ${color}`; // Glow effect
         this.element.style.width = `${this.size}px`;
         this.element.style.height = `${this.size}px`;
 
-        this.updatePosition();
+        this.updatePosition(); // Update posisi di DOM
     }
 
+    /* ==========================================
+       UPDATE POSITION - Sync posisi ke DOM
+       ========================================== */
     updatePosition() {
         this.element.style.left = `${this.x}px`;
         this.element.style.top = `${this.y}px`;
     }
 
+    /* ==========================================
+       MOVE - Update posisi berdasarkan velocity
+       ========================================== 
+       Fitur: Wrap-around screen (partikel keluar = muncul sisi lain)
+       ========================================== */
     move() {
+        // Update posisi berdasarkan kecepatan
         this.x += this.vx;
         this.y += this.vy;
 
+        // ♻️ WRAP-AROUND LOGIC
+        // Kalau keluar dari kiri → muncul dari kanan
         if (this.x < -10) this.x = window.innerWidth + 10;
+        // Kalau keluar dari kanan → muncul dari kiri
         if (this.x > window.innerWidth + 10) this.x = -10;
+        // Kalau keluar dari atas → muncul dari bawah
         if (this.y < -10) this.y = window.innerHeight + 10;
+        // Kalau keluar dari bawah → muncul dari atas
         if (this.y > window.innerHeight + 10) this.y = -10;
 
-        this.updatePosition();
+        this.updatePosition(); // Sync ke DOM
     }
 }
 
-// Create particles with even distribution
-const cols = 15;
-const rows = 10;
-let particleIndex = 0;
+/* ==========================================
+   EVEN DISTRIBUTION - Distribusi Partikel Merata
+   ========================================== 
+   Konsep: Grid 15 kolom x 10 baris (total 150 partikel)
+   Biar nggak menumpuk di satu area
+   ========================================== */
+const cols = 15; // Jumlah kolom
+const rows = 10; // Jumlah baris
+let particleIndex = 0; // Counter partikel yang sudah dibuat
 
+// Loop baris
 for (let i = 0; i < rows; i++) {
+    // Loop kolom
     for (let j = 0; j < cols; j++) {
+        // Guard: stop kalau sudah 150 partikel
         if (particleIndex >= particleCount) break;
 
         const particle = new Particle();
 
-        // Even distribution + slight random offset
+        // ⚙️ DISTRIBUSI MERATA + RANDOM OFFSET
+        // Formula: (index / total) × lebar/tinggi layar
         particle.x = (j / cols) * window.innerWidth + (Math.random() - 0.5) * 100;
         particle.y = (i / rows) * window.innerHeight + (Math.random() - 0.5) * 100;
         particle.updatePosition();
 
-        particles.push(particle);
+        particles.push(particle); // Simpan ke array
         particleIndex++;
     }
     if (particleIndex >= particleCount) break;
 }
 
-// Animate
+/* ==========================================
+   ANIMATE - Main Animation Loop
+   ========================================== 
+   Menggunakan requestAnimationFrame untuk performa optimal
+   (60 FPS, smooth, GPU-accelerated)
+   ========================================== */
 function animate() {
+    // Loop semua partikel dan gerakkan
     particles.forEach(p => p.move());
+    
+    // Request next frame (recursive call)
+    // Browser otomatis sync dengan refresh rate monitor
     requestAnimationFrame(animate);
 }
 
+// Start animation loop
 animate();
\ No newline at end of file