diff --git a/app/Filament/Admin/Resources/InternApplications/InternApplicationResource.php b/app/Filament/Admin/Resources/InternApplications/InternApplicationResource.php
index fca75f2..ecdafc7 100644
--- a/app/Filament/Admin/Resources/InternApplications/InternApplicationResource.php
+++ b/app/Filament/Admin/Resources/InternApplications/InternApplicationResource.php
@@ -203,12 +203,22 @@ class InternApplicationResource extends Resource
                                         foreach ($days as $d) {
                                             $dayNum = $d['day_number'];
                                             $dateF = $d['formatted_date'];
-                                            $content = isset($saved[$dayNum]) ? $saved[$dayNum]->content : '';
+                                            $entry = $saved->get($dayNum);
+                                            $content = $entry ? $entry->content : '';
+                                            $isRetro = $entry ? $entry->is_retroactive : false;
+                                            $updatedAt = $entry ? $entry->updated_at->format('d.m.Y H:i') : null;
                                             
                                             $html .= '<div style="margin-bottom: 12px; padding: 12px; border: 1px solid #e2e8f0; border-radius: 8px; background: #f8fafc;">';
                                             $html .= '  <div style="display:flex; justify-content:between; font-size:11px; font-weight:700; color:#475569; border-bottom:1px solid #e2e8f0; padding-bottom:6px; margin-bottom:8px;">';
                                             $html .= '    <span style="font-weight: 800; color: #2563eb;">' . $dayNum . '. Gün Raporu</span>';
-                                            $html .= '    <span style="margin-left: auto;">' . $dateF . '</span>';
+                                            if ($isRetro) {
+                                                $html .= '    <span style="margin-left: 10px; background: #fee2e2; color: #991b1b; padding: 1px 6px; border-radius: 4px; font-size: 9px; font-weight: 800;">GERİYE DÖNÜK KAYIT</span>';
+                                            }
+                                            if ($updatedAt) {
+                                                $html .= '    <span style="margin-left: auto;">Son Güncelleme: ' . $updatedAt . '</span>';
+                                            } else {
+                                                $html .= '    <span style="margin-left: auto;">' . $dateF . '</span>';
+                                            }
                                             $html .= '  </div>';
                                             $html .= '  <div style="font-size:12px; color:#1e293b; white-space:pre-wrap; line-height:1.5;">' . ($content ? e($content) : '<em style="color:#94a3b8;">Rapor yazılmamış</em>') . '</div>';
                                             $html .= '</div>';
diff --git a/app/Http/Controllers/CareerController.php b/app/Http/Controllers/CareerController.php
index 91b4785..627b265 100644
--- a/app/Http/Controllers/CareerController.php
+++ b/app/Http/Controllers/CareerController.php
@@ -472,21 +472,32 @@ class CareerController extends Controller
         ]);
 
         $dateObj = \Carbon\Carbon::parse($request->date);
+
+        // 1. Prevent future entries
+        if ($dateObj->isFuture()) {
+            return response()->json(['success' => false, 'message' => 'İleriye dönük staj günleri için defter doldurulamaz.'], 422);
+        }
+
+        // 2. Prevent weekend entries
         if ($dateObj->isWeekend()) {
             return response()->json(['success' => false, 'message' => 'Hafta sonu günlerine staj günlüğü girilemez.'], 422);
         }
 
+        // 3. Determine if retroactive
+        $isRetroactive = $dateObj->lt(\Carbon\Carbon::today());
+
         $entry = \App\Models\InternshipJournalEntry::updateOrCreate([
             'career_application_id' => $intern->id,
             'day_number' => $request->day_number,
             'date' => $request->date,
         ], [
             'content' => $request->content,
+            'is_retroactive' => $isRetroactive,
         ]);
 
         return response()->json([
             'success' => true,
-            'message' => $request->day_number . '. Gün kaydı başarıyla kaydedildi.',
+            'message' => $request->day_number . '. Gün kaydı başarıyla kaydedildi.' . ($isRetroactive ? ' (Geriye Dönük Kayıt)' : ''),
             'entry' => $entry
         ]);
     }
diff --git a/app/Models/InternshipJournalEntry.php b/app/Models/InternshipJournalEntry.php
index dbbb949..8afa936 100644
--- a/app/Models/InternshipJournalEntry.php
+++ b/app/Models/InternshipJournalEntry.php
@@ -14,6 +14,11 @@ class InternshipJournalEntry extends Model
         'day_number',
         'date',
         'content',
+        'is_retroactive',
+    ];
+
+    protected $casts = [
+        'is_retroactive' => 'boolean',
     ];
 
     /**
diff --git a/database/migrations/2026_07_01_180002_add_retroactive_fields_to_internship_journal_entries.php b/database/migrations/2026_07_01_180002_add_retroactive_fields_to_internship_journal_entries.php
new file mode 100644
index 0000000..c0169d6
--- /dev/null
+++ b/database/migrations/2026_07_01_180002_add_retroactive_fields_to_internship_journal_entries.php
@@ -0,0 +1,28 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('internship_journal_entries', function (Blueprint $table) {
+            $table->boolean('is_retroactive')->default(false);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('internship_journal_entries', function (Blueprint $table) {
+            $table->dropColumn('is_retroactive');
+        });
+    }
+};
diff --git a/resources/views/front/career/intern_dashboard.blade.php b/resources/views/front/career/intern_dashboard.blade.php
index a8bcfca..dc57a8a 100644
--- a/resources/views/front/career/intern_dashboard.blade.php
+++ b/resources/views/front/career/intern_dashboard.blade.php
@@ -722,14 +722,20 @@
                           </div>
 
                           <div class="space-y-4">
-                              <div>
+                              <div id="future-warning" class="hidden p-4 bg-amber-50/50 border border-amber-200 rounded-2xl text-xs text-amber-700 font-semibold leading-relaxed">
+                                  <i class="uil uil-exclamation-triangle text-sm mr-1"></i> Bu staj günü henüz gerçekleşmediği için staj günlüğü yazılamaz veya düzenlenemez.
+                              </div>
+
+                              <div id="editor-wrapper">
                                   <label class="block text-xs font-extrabold text-slate-500 uppercase tracking-wider mb-2">Günlük Çalışma Raporu</label>
-                                  <textarea id="editor-content" rows="10" placeholder="Bu staj gününde yaptığınız çalışmaları detaylıca yazın..." class="w-full px-4 py-3 rounded-xl border border-slate-200 focus:border-blue-400 focus:ring-1 focus:ring-blue-400 focus:outline-none text-sm font-semibold text-slate-700 bg-white transition-all"></textarea>
+                                  <div id="quill-editor-container" class="rounded-xl border border-slate-200 overflow-hidden">
+                                      <div id="editor-content-quill" style="height: 250px;"></div>
+                                  </div>
                               </div>
 
                               <div class="flex justify-between items-center">
                                   <div id="save-status" class="text-xs font-semibold text-slate-400"></div>
-                                  <button type="button" onclick="saveActiveDay()" class="px-5 py-2.5 bg-blue-600 hover:bg-blue-700 text-white font-bold rounded-xl text-xs transition-all shadow-md shadow-blue-500/10">
+                                  <button type="button" id="save-btn" onclick="saveActiveDay()" class="px-5 py-2.5 bg-blue-600 hover:bg-blue-700 text-white font-bold rounded-xl text-xs transition-all shadow-md shadow-blue-500/10">
                                       Deftere Kaydet
                                   </button>
                               </div>
@@ -789,6 +795,8 @@
 </div>
 
 @push('styles')
+<link href="https://cdn.jsdelivr.net/npm/quill@2.0.2/dist/quill.snow.css" rel="stylesheet" />
+<script src="https://cdn.jsdelivr.net/npm/quill@2.0.2/dist/quill.js"></script>
 <script src="https://cdn.tailwindcss.com"></script>
 <script>
   // Tab Switch Logic
@@ -828,6 +836,57 @@
       });
     });
 
+  let quill;
+
+  // Tab Switch Logic
+  document.addEventListener('DOMContentLoaded', function() {
+    // Initialize Quill editor
+    quill = new Quill('#editor-content-quill', {
+      theme: 'snow',
+      modules: {
+        toolbar: [
+          ['bold', 'italic', 'underline', 'strike'],        // toggled buttons
+          [{ 'list': 'ordered'}, { 'list': 'bullet' }],
+          ['clean']                                         // remove formatting button
+        ]
+      }
+    });
+
+    const tabButtons = document.querySelectorAll('.tab-btn');
+    const tabPanels = document.querySelectorAll('.tab-panel');
+
+    tabButtons.forEach(button => {
+      button.addEventListener('click', () => {
+        // Deactivate active tab
+        tabButtons.forEach(btn => {
+          btn.classList.remove('active', 'bg-blue-50', 'border-blue-100', 'text-blue-900');
+          btn.classList.add('bg-transparent', 'border-transparent', 'text-slate-600');
+          btn.querySelector('.tab-icon').classList.remove('bg-blue-600', 'text-white');
+          btn.querySelector('.tab-icon').classList.add('bg-slate-50', 'text-slate-500');
+          btn.setAttribute('aria-selected', 'false');
+        });
+
+        // Hide active panels
+        tabPanels.forEach(panel => {
+          panel.classList.add('hidden');
+        });
+
+        // Activate clicked tab
+        button.classList.add('active', 'bg-blue-50', 'border-blue-100', 'text-blue-900');
+        button.classList.remove('bg-transparent', 'border-transparent', 'text-slate-600');
+        button.querySelector('.tab-icon').classList.add('bg-blue-600', 'text-white');
+        button.querySelector('.tab-icon').classList.remove('bg-slate-50', 'text-slate-500');
+        button.setAttribute('aria-selected', 'true');
+
+        // Show targets panel
+        const targetId = button.getAttribute('data-tab-target');
+        const targetPanel = document.getElementById(targetId + '-panel');
+        if (targetPanel) {
+          targetPanel.classList.remove('hidden');
+        }
+      });
+    });
+
     // Handle initial state of date logic
     calculateEndDateFrontend();
     
@@ -906,8 +965,40 @@
 
       document.getElementById('editor-day-title').textContent = `${dayNum}. Gün`;
       document.getElementById('editor-day-date').textContent = dateFormatted;
-      document.getElementById('editor-content').value = savedContent;
+      
+      quill.root.innerHTML = savedContent || '';
       document.getElementById('save-status').textContent = '';
+
+      // Future validation
+      const dateParts = dateVal.split('-');
+      const selectedDate = new Date(dateParts[0], dateParts[1] - 1, dateParts[2]);
+      const today = new Date();
+      today.setHours(0,0,0,0);
+      
+      const isFuture = selectedDate > today;
+      const warningBlock = document.getElementById('future-warning');
+      const saveBtn = document.getElementById('save-btn');
+      const gitBtn = document.querySelector('button[onclick="fillFromGithub()"]');
+
+      if (isFuture) {
+          warningBlock.classList.remove('hidden');
+          quill.enable(false);
+          saveBtn.disabled = true;
+          saveBtn.classList.add('opacity-50', 'cursor-not-allowed');
+          if (gitBtn) {
+              gitBtn.disabled = true;
+              gitBtn.classList.add('opacity-50', 'cursor-not-allowed');
+          }
+      } else {
+          warningBlock.classList.add('hidden');
+          quill.enable(true);
+          saveBtn.disabled = false;
+          saveBtn.classList.remove('opacity-50', 'cursor-not-allowed');
+          if (gitBtn) {
+              gitBtn.disabled = false;
+              gitBtn.classList.remove('opacity-50', 'cursor-not-allowed');
+          }
+      }
     }
   }
 
@@ -923,25 +1014,26 @@
       return;
     }
 
-    let commitText = "";
+    let commitHtml = "<ul>";
     const sorted = [...dayCommits].reverse();
     sorted.forEach(c => {
       const msg = c.commit.message;
       const sha = c.sha.substring(0, 7);
       const authorDate = new Date(c.commit.author.date);
       const time = authorDate.toLocaleTimeString('tr-TR', { hour: '2-digit', minute: '2-digit' });
-      commitText += `- [${time}] (${sha}) ${msg}\n`;
+      commitHtml += `<li><strong>[${time}]</strong> (<em>${sha}</em>) ${msg}</li>`;
     });
+    commitHtml += "</ul>";
 
-    const textarea = document.getElementById('editor-content');
-    if (textarea.value.trim() !== "") {
+    const currentHtml = quill.root.innerHTML.trim();
+    if (currentHtml !== "" && currentHtml !== "<p><br></p>") {
       if (confirm("Mevcut rapor içeriğinizin sonuna bu günün commitlerini eklemek ister misiniz? (Hayır derseniz mevcut içerik silinip commitler yazılır.)")) {
-        textarea.value = textarea.value.trim() + "\n\n" + commitText.trim();
+        quill.root.innerHTML = currentHtml + "<br><br>" + commitHtml;
       } else {
-        textarea.value = commitText.trim();
+        quill.root.innerHTML = commitHtml;
       }
     } else {
-      textarea.value = commitText.trim();
+      quill.root.innerHTML = commitHtml;
     }
   }
 
@@ -951,7 +1043,10 @@
 
     const dayNum = btn.getAttribute('data-day-num');
     const dateVal = btn.getAttribute('data-date');
-    const contentVal = document.getElementById('editor-content').value;
+    let contentVal = quill.root.innerHTML;
+    if (contentVal === '<p><br></p>') {
+        contentVal = '';
+    }
     const statusText = document.getElementById('save-status');
 
     statusText.textContent = "Kaydediliyor...";
diff --git a/resources/views/front/career/print.blade.php b/resources/views/front/career/print.blade.php
index d5bf795..3bf3ea8 100644
--- a/resources/views/front/career/print.blade.php
+++ b/resources/views/front/career/print.blade.php
@@ -207,11 +207,25 @@
             background: #ffffff;
             margin-bottom: 20px;
             min-height: 250px;
-            white-space: pre-wrap;
             line-height: 1.6;
             color: #334155;
             font-size: 13px;
         }
+        .content-area ul {
+            list-style-type: disc !important;
+            padding-left: 20px !important;
+            margin-top: 8px !important;
+            margin-bottom: 8px !important;
+        }
+        .content-area ol {
+            list-style-type: decimal !important;
+            padding-left: 20px !important;
+            margin-top: 8px !important;
+            margin-bottom: 8px !important;
+        }
+        .content-area li {
+            margin-bottom: 4px !important;
+        }
         
         .empty-content {
             color: #94a3b8;
@@ -383,7 +397,7 @@
                 <!-- Content Area -->
                 <div class="content-area">
                     @if($entry && trim($entry->content))
-                        {!! nl2br(e($entry->content)) !!}
+                        {!! $entry->content !!}
                     @else
                         <div class="empty-content">Bu gün için herhangi bir staj raporu girilmemiştir.</div>
                     @endif
diff --git a/resources/views/front/career/verify.blade.php b/resources/views/front/career/verify.blade.php
index 211ec1b..b774290 100644
--- a/resources/views/front/career/verify.blade.php
+++ b/resources/views/front/career/verify.blade.php
@@ -22,11 +22,8 @@
                 <button onclick="downloadPDF()" id="pdf-btn" class="px-4 py-2 bg-orange-600 hover:bg-orange-700 text-white text-sm font-bold rounded-lg transition-all shadow-sm flex items-center gap-1.5 whitespace-nowrap">
                     <i class="uil uil-file-download text-base" id="pdf-icon"></i>
                     <span class="spinner-border spinner-border-sm hidden animate-spin w-3.5 h-3.5 border-2 border-white border-t-transparent rounded-full" id="pdf-spinner" role="status"></span>
-                    <span id="pdf-btn-text">PDF İndir</span>
-                </button>
             </div>
-              </div>
-        @endif
+        </div>
 
     </div>
 </div>
@@ -218,7 +215,7 @@
                                         <span class="text-xs font-extrabold text-slate-800">{{ $day['day_number'] }}. Gün Raporu</span>
                                         <span class="text-[10px] text-slate-400 font-bold">{{ $day['formatted_date'] }}</span>
                                     </div>
-                                    <p class="text-xs text-slate-600 whitespace-pre-wrap leading-relaxed" style="font-size: 11px;">{{ $entry->content }}</p>
+                                    <div class="text-xs text-slate-600 leading-relaxed verify-log-content" style="font-size: 11px;">{!! $entry->content !!}</div>
                                 </div>
                                 @endif
                             @endforeach
@@ -268,6 +265,21 @@
         /* Global scale factor for transcript page fonts. Adjust this easily (e.g. 1.0, 1.10, 1.20) */
         --transcript-font-scale: 1.30;
     }
+    .verify-log-content ul {
+        list-style-type: disc !important;
+        padding-left: 18px !important;
+        margin-top: 5px !important;
+        margin-bottom: 5px !important;
+    }
+    .verify-log-content ol {
+        list-style-type: decimal !important;
+        padding-left: 18px !important;
+        margin-top: 5px !important;
+        margin-bottom: 5px !important;
+    }
+    .verify-log-content li {
+        margin-bottom: 3px !important;
+    }
 
     body {
         font-family: 'Inter', sans-serif;