feat: implement core course platform UI and logic

- Add project configuration and git ignore rules
- Implement App router with protected routes
- Develop course player, grid, and card components
- Add state management for course progress and navigation
- Initialize database services for course and comment data

pages/ManageCourses.tsx

@@ -0,0 +1,905 @@
+import React, { useState, useEffect, useRef } from 'react';
+import { 
+  Plus, 
+  Settings, 
+  Users, 
+  BarChart, 
+  Trash2, 
+  Edit2, 
+  X, 
+  MessageSquare, 
+  Send, 
+  Image as ImageIcon, 
+  Video, 
+  Sparkles, 
+  Loader2, 
+  FileText, 
+  FileSpreadsheet,
+  FileArchive,
+  Link as LinkIcon, 
+  Paperclip, 
+  Lightbulb, 
+  ListVideo, 
+  Check, 
+  Lock, 
+  Unlock, 
+  UploadCloud, 
+  Globe,
+  Download
+} from 'lucide-react';
+import { Course, Comment, Attachment, Lesson, AttachmentType } from '../types';
+import { useToast } from '../context/ToastContext';
+import { getCourses, saveCourse, deleteCourse, getComments, saveComment } from '../services/db';
+import { generateStudentReply } from '../services/ai';
+import { CATEGORIES } from '../constants';
+import { getAttachmentIcon, getAttachmentBadge } from '../components/MaterialCard';
+
+// 1. Create/Edit Course Modal
+const CourseModal: React.FC<{
+  isOpen: boolean;
+  onClose: () => void;
+  onSave: (course: Course) => void;
+  initialData?: Course;
+}> = ({ isOpen, onClose, onSave, initialData }) => {
+  const [title, setTitle] = useState('');
+  const [description, setDescription] = useState('');
+  const [category, setCategory] = useState('');
+  const [thumbnailPreview, setThumbnailPreview] = useState<string>('');
+  const [instructor, setInstructor] = useState('Mário Morgado');
+  const [instructorRole, setInstructorRole] = useState('Especialista em Performance');
+  
+  // Lesson Management
+  const [lessons, setLessons] = useState<Lesson[]>([]);
+  
+  // New Lesson State
+  const [newLessonTitle, setNewLessonTitle] = useState('');
+  const [newLessonDuration, setNewLessonDuration] = useState('');
+  const [newLessonVideoUrl, setNewLessonVideoUrl] = useState('');
+  const [newLessonIsFree, setNewLessonIsFree] = useState(false);
+  const [videoSourceType, setVideoSourceType] = useState<'upload' | 'link'>('upload');
+  const [selectedFileName, setSelectedFileName] = useState('');
+  const lessonFileInputRef = useRef<HTMLInputElement>(null);
+
+  // Tips & Global Attachments
+  const [tips, setTips] = useState<string[]>([]);
+  const [newTip, setNewTip] = useState('');
+  const [attachments, setAttachments] = useState<Attachment[]>([]);
+  
+  // New Attachment State
+  const [newAttName, setNewAttName] = useState('');
+  const [newAttType, setNewAttType] = useState<AttachmentType>('pdf');
+  const [newAttUrl, setNewAttUrl] = useState('');
+  const [newAttSize, setNewAttSize] = useState('');
+  const [newAttDesc, setNewAttDesc] = useState('');
+  
+  const [isSubmitting, setIsSubmitting] = useState(false);
+  const fileInputRef = useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    if (isOpen) {
+      if (initialData) {
+        setTitle(initialData.title);
+        setDescription(initialData.description);
+        setCategory(initialData.category);
+        setThumbnailPreview(initialData.thumbnail);
+        setInstructor(initialData.instructor || 'Mário Morgado');
+        setInstructorRole(initialData.instructorRole || 'Especialista em Performance');
+        setTips(initialData.tips || []);
+        setAttachments(initialData.attachments || []);
+        setLessons(initialData.lessons || []);
+      } else {
+        setTitle('');
+        setDescription('');
+        setCategory(CATEGORIES[0]);
+        setThumbnailPreview('');
+        setInstructor('Mário Morgado');
+        setInstructorRole('Especialista em Performance');
+        setTips([]);
+        setAttachments([]);
+        setLessons([]);
+      }
+    }
+  }, [isOpen, initialData]);
+
+  const handleFileChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+    const file = e.target.files?.[0];
+    if (file) {
+      const objectUrl = URL.createObjectURL(file);
+      setThumbnailPreview(objectUrl);
+    }
+  };
+
+  const handleLessonVideoFileSelect = (e: React.ChangeEvent<HTMLInputElement>) => {
+    const file = e.target.files?.[0];
+    if (file) {
+      const objectUrl = URL.createObjectURL(file);
+      setNewLessonVideoUrl(objectUrl);
+      setSelectedFileName(file.name);
+      if (!newLessonDuration) setNewLessonDuration('15m');
+    }
+  };
+
+  const handleAddLesson = () => {
+    if (!newLessonTitle.trim()) {
+      alert("Digite um título para a aula.");
+      return;
+    }
+    if (!newLessonVideoUrl.trim()) {
+      alert("Selecione um vídeo ou insira um link.");
+      return;
+    }
+
+    const newLesson: Lesson = {
+      id: `lesson-${Date.now()}`,
+      title: newLessonTitle,
+      duration: newLessonDuration || '15m',
+      videoUrl: newLessonVideoUrl,
+      isFree: newLessonIsFree,
+      description: ''
+    };
+
+    setLessons([...lessons, newLesson]);
+    
+    setNewLessonTitle('');
+    setNewLessonDuration('');
+    setNewLessonVideoUrl('');
+    setSelectedFileName('');
+    setNewLessonIsFree(false);
+    if (lessonFileInputRef.current) lessonFileInputRef.current.value = '';
+  };
+
+  const removeLesson = (id: string) => {
+    setLessons(lessons.filter(l => l.id !== id));
+  };
+
+  const toggleLessonAccess = (id: string) => {
+    setLessons(lessons.map(l => l.id === id ? { ...l, isFree: !l.isFree } : l));
+  };
+
+  const handleAddTip = () => {
+    if (newTip.trim()) {
+      setTips([...tips, newTip.trim()]);
+      setNewTip('');
+    }
+  };
+
+  const removeTip = (idx: number) => {
+    setTips(tips.filter((_, i) => i !== idx));
+  };
+
+  const handleAddAttachment = () => {
+    if (!newAttName.trim()) {
+      alert("Informe o nome do arquivo para download.");
+      return;
+    }
+
+    const att: Attachment = {
+      id: `att-${Date.now()}`,
+      name: newAttName.trim(),
+      type: newAttType,
+      url: newAttUrl.trim() || '#',
+      size: newAttSize.trim() || '1.5 MB',
+      description: newAttDesc.trim()
+    };
+
+    setAttachments([...attachments, att]);
+    setNewAttName('');
+    setNewAttSize('');
+    setNewAttUrl('');
+    setNewAttDesc('');
+  };
+
+  const removeAttachment = (id: string) => {
+    setAttachments(attachments.filter(a => a.id !== id));
+  };
+
+  const handleSubmit = (e: React.FormEvent) => {
+    e.preventDefault();
+    if (lessons.length === 0) {
+      alert("Adicione pelo menos uma aula à trilha.");
+      return;
+    }
+
+    setIsSubmitting(true);
+    
+    const durationStr = `${lessons.length} Aulas`; 
+
+    onSave({
+      id: initialData?.id || `course-${Date.now()}`,
+      title,
+      description,
+      category: category || CATEGORIES[0],
+      thumbnail: thumbnailPreview || 'https://images.unsplash.com/photo-1460925895917-afdab827c52f?auto=format&fit=crop&w=800&q=80',
+      duration: durationStr,
+      instructor,
+      instructorRole,
+      views: initialData?.views || 0,
+      progress: initialData?.progress || 0,
+      lessons: lessons,
+      tips: tips,
+      attachments: attachments
+    });
+    
+    setIsSubmitting(false);
+    onClose();
+  };
+
+  if (!isOpen) return null;
+
+  return (
+    <div className="fixed inset-0 z-[100] flex items-center justify-center p-4">
+      <div className="absolute inset-0 bg-black/80 backdrop-blur-xl" onClick={onClose} />
+      <div className="relative w-full max-w-6xl bg-[#141416] rounded-3xl border border-white/10 p-6 md:p-8 shadow-2xl animate-fade-in-up max-h-[92vh] overflow-y-auto flex flex-col lg:flex-row gap-8">
+        
+        {/* Left Column: Course Details, Tips & Downloads */}
+        <div className="w-full lg:w-5/12 space-y-6">
+          <div className="flex justify-between items-center lg:hidden mb-2">
+            <h2 className="text-xl font-bold text-white">{initialData ? 'Editar Curso' : 'Criar Curso'}</h2>
+            <button onClick={onClose}><X className="text-white" /></button>
+          </div>
+
+          {/* Thumbnail */}
+          <div>
+            <label className="text-xs text-gray-400 uppercase font-bold tracking-wider mb-2 block">Imagem de Capa (16:9)</label>
+            <div 
+              className="w-full aspect-video rounded-2xl border-2 border-dashed border-white/10 bg-black/40 flex flex-col items-center justify-center cursor-pointer hover:border-orange-500/50 transition-colors relative overflow-hidden group"
+              onClick={() => fileInputRef.current?.click()}
+            >
+              {thumbnailPreview ? (
+                <>
+                  <img src={thumbnailPreview} alt="Preview" className="w-full h-full object-cover opacity-70 group-hover:opacity-40 transition-opacity" />
+                  <div className="absolute inset-0 flex items-center justify-center opacity-0 group-hover:opacity-100 transition-opacity">
+                    <span className="bg-orange-500 px-4 py-2 rounded-xl text-xs font-bold shadow-lg">Alterar Capa</span>
+                  </div>
+                </>
+              ) : (
+                <div className="text-center p-6">
+                  <ImageIcon className="w-10 h-10 text-orange-400/60 mx-auto mb-2" />
+                  <p className="text-gray-300 text-xs font-medium">Clique para selecionar imagem</p>
+                </div>
+              )}
+              <input 
+                ref={fileInputRef} 
+                type="file" 
+                accept="image/*" 
+                className="hidden" 
+                onChange={handleFileChange}
+              />
+            </div>
+          </div>
+
+          <div className="space-y-4">
+            <div>
+              <label className="text-xs text-gray-400 uppercase font-bold tracking-wider mb-1 block">Título do Curso</label>
+              <input
+                type="text"
+                value={title}
+                onChange={(e) => setTitle(e.target.value)}
+                placeholder="Ex: Masterclass: Escala de Tráfego Pago"
+                className="w-full bg-black/50 text-white text-base font-bold border border-white/10 rounded-xl px-4 py-3 focus:outline-none focus:border-orange-500/50"
+                required
+              />
+            </div>
+
+            <div className="grid grid-cols-2 gap-3">
+              <div>
+                <label className="text-xs text-gray-400 uppercase font-bold tracking-wider mb-1 block">Categoria</label>
+                <select
+                  value={category}
+                  onChange={(e) => setCategory(e.target.value)}
+                  className="w-full bg-black/50 text-white border border-white/10 rounded-xl px-3 py-2.5 text-xs focus:outline-none focus:border-orange-500/50"
+                >
+                  {CATEGORIES.map(cat => (
+                    <option key={cat} value={cat} className="bg-zinc-900">{cat}</option>
+                  ))}
+                </select>
+              </div>
+
+              <div>
+                <label className="text-xs text-gray-400 uppercase font-bold tracking-wider mb-1 block">Instrutor</label>
+                <input
+                  type="text"
+                  value={instructor}
+                  onChange={(e) => setInstructor(e.target.value)}
+                  placeholder="Nome do Instrutor"
+                  className="w-full bg-black/50 text-white border border-white/10 rounded-xl px-3 py-2.5 text-xs focus:outline-none focus:border-orange-500/50"
+                />
+              </div>
+            </div>
+
+            <div>
+              <label className="text-xs text-gray-400 uppercase font-bold tracking-wider mb-1 block">Descrição do Curso</label>
+              <textarea
+                value={description}
+                onChange={(e) => setDescription(e.target.value)}
+                rows={3}
+                placeholder="O que os alunos vão aprender e dominar neste curso?"
+                className="w-full bg-black/50 text-white border border-white/10 rounded-xl px-4 py-2.5 text-xs focus:outline-none focus:border-orange-500/50 resize-none leading-relaxed"
+              />
+            </div>
+          </div>
+
+          {/* Downloadable Materials Section */}
+          <div className="bg-black/40 p-4 rounded-2xl border border-white/10 space-y-3">
+            <div className="flex items-center justify-between">
+              <h3 className="text-xs font-bold text-orange-400 uppercase tracking-wider flex items-center gap-1.5">
+                <Download className="w-4 h-4" />
+                Materiais Complementares ({attachments.length})
+              </h3>
+            </div>
+
+            {/* Add attachment inputs */}
+            <div className="space-y-2 pt-1">
+              <div className="grid grid-cols-3 gap-2">
+                <input 
+                  type="text" 
+                  value={newAttName}
+                  onChange={(e) => setNewAttName(e.target.value)}
+                  placeholder="Nome do arquivo (ex: Planilha_ROAS.xlsx)"
+                  className="col-span-2 bg-white/5 border border-white/10 rounded-lg px-2.5 py-1.5 text-xs text-white focus:outline-none focus:border-orange-500/50"
+                />
+                <select
+                  value={newAttType}
+                  onChange={(e) => setNewAttType(e.target.value as AttachmentType)}
+                  className="bg-zinc-900 border border-white/10 rounded-lg px-2 py-1.5 text-xs text-white focus:outline-none"
+                >
+                  <option value="pdf">PDF</option>
+                  <option value="spreadsheet">Planilha</option>
+                  <option value="zip">Pacote ZIP</option>
+                  <option value="doc">Documento</option>
+                  <option value="link">Link</option>
+                </select>
+              </div>
+
+              <div className="flex gap-2">
+                <input 
+                  type="text" 
+                  value={newAttSize}
+                  onChange={(e) => setNewAttSize(e.target.value)}
+                  placeholder="Tamanho (ex: 2.4 MB)"
+                  className="w-28 bg-white/5 border border-white/10 rounded-lg px-2.5 py-1.5 text-xs text-white focus:outline-none"
+                />
+                <input 
+                  type="text" 
+                  value={newAttDesc}
+                  onChange={(e) => setNewAttDesc(e.target.value)}
+                  placeholder="Breve descrição do material..."
+                  className="flex-1 bg-white/5 border border-white/10 rounded-lg px-2.5 py-1.5 text-xs text-white focus:outline-none"
+                />
+                <button 
+                  type="button" 
+                  onClick={handleAddAttachment}
+                  className="bg-orange-500 hover:bg-orange-600 px-3 py-1.5 rounded-lg text-white text-xs font-bold shrink-0 transition-colors"
+                >
+                  Adicionar
+                </button>
+              </div>
+            </div>
+
+            {/* List of Attachments */}
+            <div className="space-y-1.5 max-h-36 overflow-y-auto pr-1 pt-1">
+              {attachments.map((att) => (
+                <div key={att.id} className="flex items-center justify-between p-2 rounded-lg bg-white/5 border border-white/5 text-xs">
+                  <div className="flex items-center gap-2 min-w-0 pr-2">
+                    {getAttachmentIcon(att.type)}
+                    <span className="text-gray-200 font-medium truncate">{att.name}</span>
+                    <span className="text-[10px] text-gray-500 font-mono">({att.size || '1 MB'})</span>
+                  </div>
+                  <button 
+                    type="button" 
+                    onClick={() => removeAttachment(att.id)}
+                    className="text-gray-500 hover:text-red-400 p-1"
+                  >
+                    <Trash2 className="w-3.5 h-3.5" />
+                  </button>
+                </div>
+              ))}
+            </div>
+          </div>
+        </div>
+
+        {/* Right Column: Lessons Builder */}
+        <div className="flex-1 flex flex-col justify-between">
+          <div>
+            <div className="hidden lg:flex justify-between items-center mb-6">
+              <h2 className="text-2xl font-extrabold text-white">
+                {initialData ? 'Gerenciar Trilha & Aulas' : 'Estruturar Grade de Aulas'}
+              </h2>
+              <button onClick={onClose} className="p-2 bg-white/5 rounded-full hover:bg-white/20 transition-colors">
+                <X className="w-5 h-5 text-white" />
+              </button>
+            </div>
+
+            <div className="bg-black/50 rounded-2xl border border-white/10 overflow-hidden mb-6">
+              <div className="p-4 border-b border-white/5 bg-zinc-900/50 flex items-center justify-between">
+                <div className="flex items-center gap-2">
+                  <ListVideo className="w-4 h-4 text-orange-400" />
+                  <h3 className="font-bold text-white text-sm">Grade do Curso</h3>
+                </div>
+                <span className="bg-orange-500/10 text-orange-400 border border-orange-500/20 px-3 py-0.5 rounded-full text-xs font-bold">
+                  {lessons.length} Aulas
+                </span>
+              </div>
+
+              {/* Lesson List */}
+              <div className="overflow-y-auto p-4 space-y-2.5 max-h-[300px]">
+                {lessons.length === 0 && (
+                  <div className="flex flex-col items-center justify-center py-10 text-gray-500 space-y-2">
+                    <ListVideo className="w-8 h-8 opacity-20 text-orange-400" />
+                    <p className="text-xs">Nenhuma aula cadastrada ainda. Adicione abaixo.</p>
+                  </div>
+                )}
+                {lessons.map((lesson, index) => (
+                  <div key={lesson.id} className="flex items-center gap-3 bg-white/[0.04] p-3 rounded-xl border border-white/5 group hover:border-orange-500/30 transition-all">
+                    <div className="flex items-center justify-center w-6 h-6 rounded-lg bg-white/10 text-gray-400 font-mono text-xs font-bold">
+                      {index + 1}
+                    </div>
+                    
+                    <div className="flex-1 min-w-0">
+                      <h4 className="text-white font-medium text-xs md:text-sm truncate">{lesson.title}</h4>
+                      <div className="flex items-center gap-2 text-[11px] text-gray-500 mt-0.5">
+                        <span className="flex items-center gap-1"><Video className="w-3 h-3 text-orange-400/70"/> {lesson.duration}</span>
+                        {lesson.isFree ? (
+                          <span className="text-emerald-400 font-bold bg-emerald-500/10 px-1.5 py-0.2 rounded text-[9px] uppercase">GRÁTIS</span>
+                        ) : (
+                          <span className="text-purple-400 font-bold bg-purple-500/10 px-1.5 py-0.2 rounded text-[9px] uppercase">EXCLUSIVA</span>
+                        )}
+                      </div>
+                    </div>
+
+                    <div className="flex items-center gap-1">
+                      <button 
+                        type="button"
+                        onClick={() => toggleLessonAccess(lesson.id)}
+                        className={`p-1.5 rounded-lg transition-colors ${lesson.isFree ? 'text-emerald-400 hover:bg-emerald-500/10' : 'text-purple-400 hover:bg-purple-500/10'}`}
+                        title={lesson.isFree ? "Tornar Exclusiva para Membros" : "Tornar Grátis"}
+                      >
+                        {lesson.isFree ? <Unlock className="w-4 h-4" /> : <Lock className="w-4 h-4" />}
+                      </button>
+                      <button 
+                        type="button"
+                        onClick={() => removeLesson(lesson.id)}
+                        className="p-1.5 text-gray-400 hover:text-red-400 hover:bg-red-500/10 rounded-lg transition-colors"
+                      >
+                        <Trash2 className="w-4 h-4" />
+                      </button>
+                    </div>
+                  </div>
+                ))}
+              </div>
+
+              {/* Add Lesson Form Box */}
+              <div className="p-4 bg-zinc-950 border-t border-white/5 space-y-3">
+                <h4 className="text-xs font-bold text-gray-400 uppercase tracking-wider flex items-center gap-1.5">
+                  <Plus className="w-3.5 h-3.5 text-orange-400" />
+                  Cadastrar Nova Aula
+                </h4>
+                
+                <div className="flex gap-2">
+                  <input 
+                    type="text"
+                    value={newLessonTitle}
+                    onChange={(e) => setNewLessonTitle(e.target.value)}
+                    placeholder="Título da Aula (ex: 01. Configuração do Pixel)"
+                    className="flex-1 bg-white/5 border border-white/10 rounded-xl px-3 py-2 text-xs text-white focus:outline-none focus:border-orange-500/50"
+                  />
+                  <input 
+                    type="text"
+                    value={newLessonDuration}
+                    onChange={(e) => setNewLessonDuration(e.target.value)}
+                    placeholder="Duração (ex: 25m)"
+                    className="w-28 bg-white/5 border border-white/10 rounded-xl px-3 py-2 text-xs text-white focus:outline-none focus:border-orange-500/50"
+                  />
+                </div>
+
+                {/* Video Source Tabs */}
+                <div className="flex gap-2 items-center">
+                  <div className="flex bg-white/5 p-0.5 rounded-lg border border-white/5">
+                    <button 
+                      type="button"
+                      onClick={() => setVideoSourceType('upload')}
+                      className={`px-3 py-1 rounded-md text-xs font-bold transition-all ${videoSourceType === 'upload' ? 'bg-orange-500 text-white' : 'text-gray-400'}`}
+                    >
+                      Vídeo MP4
+                    </button>
+                    <button 
+                      type="button"
+                      onClick={() => setVideoSourceType('link')}
+                      className={`px-3 py-1 rounded-md text-xs font-bold transition-all ${videoSourceType === 'link' ? 'bg-orange-500 text-white' : 'text-gray-400'}`}
+                    >
+                      URL Externa
+                    </button>
+                  </div>
+
+                  <div className="flex-1">
+                    {videoSourceType === 'upload' ? (
+                      <div 
+                        onClick={() => lessonFileInputRef.current?.click()}
+                        className="border border-dashed border-white/20 hover:border-orange-500/50 rounded-xl py-2 px-3 text-center cursor-pointer transition-all bg-white/[0.02]"
+                      >
+                        <input 
+                          ref={lessonFileInputRef}
+                          type="file"
+                          accept="video/*"
+                          className="hidden"
+                          onChange={handleLessonVideoFileSelect}
+                        />
+                        <span className="text-xs text-gray-300 truncate block">
+                          {selectedFileName ? `Arquivo: ${selectedFileName}` : 'Selecionar arquivo de vídeo'}
+                        </span>
+                      </div>
+                    ) : (
+                      <input 
+                        type="text"
+                        value={newLessonVideoUrl}
+                        onChange={(e) => setNewLessonVideoUrl(e.target.value)}
+                        placeholder="https://commondatastorage.googleapis.com/...mp4"
+                        className="w-full bg-white/5 border border-white/10 rounded-xl px-3 py-2 text-xs text-white focus:outline-none"
+                      />
+                    )}
+                  </div>
+
+                  <button 
+                    type="button"
+                    onClick={handleAddLesson}
+                    className="bg-white hover:bg-orange-500 hover:text-white text-black font-bold px-4 py-2 rounded-xl text-xs transition-all shrink-0"
+                  >
+                    Adicionar Aula
+                  </button>
+                </div>
+              </div>
+            </div>
+          </div>
+
+          {/* Submit Button */}
+          <div className="pt-4 border-t border-white/5">
+            <button
+              onClick={handleSubmit}
+              disabled={isSubmitting}
+              className="w-full bg-orange-500 hover:bg-orange-600 text-white font-extrabold text-base py-4 rounded-2xl active:scale-95 transition-all shadow-lg shadow-orange-500/25"
+            >
+              {isSubmitting ? 'Salvando...' : (initialData ? 'Salvar Alterações no Curso' : 'Publicar Curso & Materiais')}
+            </button>
+          </div>
+        </div>
+
+      </div>
+    </div>
+  );
+};
+
+export const ManageCourses: React.FC = () => {
+  const [courses, setCourses] = useState<Course[]>([]);
+  const [isModalOpen, setIsModalOpen] = useState(false);
+  const [editingCourse, setEditingCourse] = useState<Course | undefined>(undefined);
+  const [loading, setLoading] = useState(true);
+  const [activeTab, setActiveTab] = useState<'courses' | 'comments'>('courses');
+  const [allComments, setAllComments] = useState<{comment: Comment, courseTitle: string}[]>([]);
+  const [replyingTo, setReplyingTo] = useState<string | null>(null);
+  const [replyText, setReplyText] = useState('');
+  const [isGeneratingReply, setIsGeneratingReply] = useState(false);
+  
+  const { showToast } = useToast();
+
+  const loadData = async () => {
+    setLoading(true);
+    const data = await getCourses();
+    setCourses(data);
+    
+    // Load all comments
+    const commentsAccumulator: {comment: Comment, courseTitle: string}[] = [];
+    for (const c of data) {
+      const courseComments = await getComments(c.id);
+      courseComments.forEach(comm => {
+        commentsAccumulator.push({ comment: comm, courseTitle: c.title });
+      });
+    }
+    setAllComments(commentsAccumulator);
+    setLoading(false);
+  };
+
+  useEffect(() => {
+    loadData();
+  }, []);
+
+  const handleCreate = () => {
+    setEditingCourse(undefined);
+    setIsModalOpen(true);
+  };
+
+  const handleEdit = (course: Course) => {
+    setEditingCourse(course);
+    setIsModalOpen(true);
+  };
+
+  const handleDelete = async (id: string) => {
+    if (window.confirm('Tem certeza que deseja excluir este curso?')) {
+      await deleteCourse(id);
+      showToast('Curso removido com sucesso!', 'success');
+      loadData();
+    }
+  };
+
+  const handleSave = async (course: Course) => {
+    await saveCourse(course);
+    showToast('Curso e materiais salvos com sucesso!', 'success');
+    loadData();
+  };
+
+  const handleSendReply = async (commentId: string) => {
+    if (!replyText.trim()) return;
+
+    const target = allComments.find(c => c.comment.id === commentId);
+    if (target) {
+      const updatedComment: Comment = {
+        ...target.comment,
+        reply: replyText,
+        replyDate: new Date().toLocaleDateString('pt-BR')
+      };
+      await saveComment(updatedComment);
+      showToast('Resposta enviada com sucesso!', 'success');
+      setReplyingTo(null);
+      setReplyText('');
+      loadData();
+    }
+  };
+
+  const handleGenerateAIReply = async (commentText: string, courseTitle: string) => {
+    setIsGeneratingReply(true);
+    try {
+      const aiReply = await generateStudentReply(commentText, courseTitle);
+      setReplyText(aiReply);
+    } catch (e) {
+      showToast('Erro ao gerar resposta com IA.', 'error');
+    } finally {
+      setIsGeneratingReply(false);
+    }
+  };
+
+  // Metrics
+  const totalViews = courses.reduce((acc, c) => acc + (c.views || 0), 0);
+  const totalLessons = courses.reduce((acc, c) => acc + c.lessons.length, 0);
+  const totalMaterials = courses.reduce((acc, c) => {
+    const globalCount = c.attachments?.length || 0;
+    const lessonCount = c.lessons.reduce((lAcc, l) => lAcc + (l.attachments?.length || 0), 0);
+    return acc + globalCount + lessonCount;
+  }, 0);
+
+  return (
+    <div className="min-h-screen bg-[#09090b] text-white pt-24 pb-20 px-6 md:px-12 max-w-[1440px] mx-auto">
+      
+      {/* Header */}
+      <div className="flex flex-col md:flex-row md:items-center justify-between gap-6 pb-8 border-b border-white/10">
+        <div>
+          <div className="flex items-center gap-2 text-caption font-semibold uppercase tracking-caption text-orange-400 mb-2">
+            <span>Compor HUB</span>
+            <span>•</span>
+            <span>Painel do Instrutor</span>
+          </div>
+          <h1 className="font-display text-subheading sm:text-heading-sm md:text-heading font-bold tracking-heading leading-heading">
+            Gestão de Cursos & Materiais
+          </h1>
+          <p className="text-body-sm font-normal text-gray-400 mt-1 leading-body-sm tracking-body-sm">
+            Cadastre videoaulas, organize trilhas e disponibilize arquivos de apoio para download.
+          </p>
+        </div>
+
+        <div className="flex items-center gap-3">
+          <button
+            onClick={handleCreate}
+            className="flex items-center gap-2 bg-orange-500 hover:bg-orange-600 text-white text-body-sm font-semibold tracking-body-sm px-6 py-3 rounded-[980px] shadow-xl shadow-orange-500/20 transition-all active:scale-95"
+          >
+            <Plus className="w-4 h-4" />
+            <span>Novo Curso</span>
+          </button>
+        </div>
+      </div>
+
+      {/* Metrics Row */}
+      <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-4 my-8">
+        <div className="bg-zinc-900/60 border border-white/10 p-5 rounded-[8px] shadow-xl">
+          <span className="text-caption text-gray-400 font-semibold uppercase tracking-caption">Total de Cursos</span>
+          <p className="font-display text-subheading md:text-heading-sm font-bold text-white mt-1">{courses.length}</p>
+        </div>
+        <div className="bg-zinc-900/60 border border-white/10 p-5 rounded-[8px] shadow-xl">
+          <span className="text-caption text-gray-400 font-semibold uppercase tracking-caption">Total de Aulas</span>
+          <p className="font-display text-subheading md:text-heading-sm font-bold text-orange-400 mt-1">{totalLessons}</p>
+        </div>
+        <div className="bg-zinc-900/60 border border-white/10 p-5 rounded-[8px] shadow-xl">
+          <span className="text-caption text-gray-400 font-semibold uppercase tracking-caption">Materiais para Download</span>
+          <p className="font-display text-subheading md:text-heading-sm font-bold text-emerald-400 mt-1">{totalMaterials}</p>
+        </div>
+        <div className="bg-zinc-900/60 border border-white/10 p-5 rounded-[8px] shadow-xl">
+          <span className="text-caption text-gray-400 font-semibold uppercase tracking-caption">Visualizações Acumuladas</span>
+          <p className="font-display text-subheading md:text-heading-sm font-bold text-white mt-1">{totalViews.toLocaleString('pt-BR')}</p>
+        </div>
+      </div>
+
+      {/* Navigation Tabs */}
+      <div className="flex gap-4 border-b border-white/10 mb-8">
+        <button
+          onClick={() => setActiveTab('courses')}
+          className={`pb-3 text-body-sm font-semibold tracking-body-sm transition-all border-b-2 ${
+            activeTab === 'courses'
+              ? 'border-orange-500 text-white'
+              : 'border-transparent text-gray-500 hover:text-gray-300'
+          }`}
+        >
+          Cursos Cadastrados ({courses.length})
+        </button>
+        <button
+          onClick={() => setActiveTab('comments')}
+          className={`pb-3 text-body-sm font-semibold tracking-body-sm transition-all border-b-2 flex items-center gap-2 ${
+            activeTab === 'comments'
+              ? 'border-orange-500 text-white'
+              : 'border-transparent text-gray-500 hover:text-gray-300'
+          }`}
+        >
+          <MessageSquare className="w-4 h-4" />
+          Dúvidas dos Alunos ({allComments.length})
+        </button>
+      </div>
+
+      {/* Tab: Courses List */}
+      {activeTab === 'courses' && (
+        <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
+          {courses.map(course => {
+            const courseAttachments = (course.attachments?.length || 0) + course.lessons.reduce((acc, l) => acc + (l.attachments?.length || 0), 0);
+            
+            return (
+              <div 
+                key={course.id} 
+                className="bg-zinc-900/80 border border-white/10 rounded-[8px] overflow-hidden flex flex-col justify-between hover:border-orange-500/40 transition-all duration-300 group shadow-xl"
+              >
+                <div>
+                  {/* Thumbnail */}
+                  <div className="aspect-video relative overflow-hidden bg-black rounded-t-[8px]">
+                    <img 
+                      src={course.thumbnail} 
+                      alt={course.title} 
+                      className="w-full h-full object-cover group-hover:scale-105 transition-transform duration-500" 
+                    />
+                    <div className="absolute top-3 left-3 bg-black/70 backdrop-blur-md px-2.5 py-1 rounded-[980px] text-caption font-semibold uppercase tracking-caption text-white border border-white/10">
+                      {course.category}
+                    </div>
+                  </div>
+
+                  {/* Body */}
+                  <div className="p-5">
+                    <h3 className="font-display font-bold text-subheading text-white mb-2 line-clamp-1 group-hover:text-orange-400 transition-colors tracking-subheading leading-subheading">
+                      {course.title}
+                    </h3>
+                    <p className="text-caption text-gray-400 line-clamp-2 leading-caption tracking-caption font-normal mb-4">
+                      {course.description}
+                    </p>
+
+                    <div className="flex items-center gap-3 text-caption text-gray-400 pt-3 border-t border-white/5 font-semibold tracking-caption">
+                      <span className="flex items-center gap-1 text-gray-300 font-semibold">
+                        <Video className="w-3.5 h-3.5 text-orange-400" />
+                        {course.lessons.length} Aulas
+                      </span>
+                      <span>•</span>
+                      <span className="flex items-center gap-1 text-gray-300 font-semibold">
+                        <Download className="w-3.5 h-3.5 text-emerald-400" />
+                        {courseAttachments} Materiais
+                      </span>
+                    </div>
+                  </div>
+                </div>
+
+                {/* Actions */}
+                <div className="p-4 bg-black/40 border-t border-white/5 flex items-center justify-between gap-2">
+                  <button
+                    onClick={() => handleEdit(course)}
+                    className="flex-1 flex items-center justify-center gap-1.5 py-2.5 rounded-[980px] bg-white/5 hover:bg-orange-500 hover:text-white text-body-sm font-semibold tracking-body-sm transition-colors text-gray-200"
+                  >
+                    <Edit2 className="w-3.5 h-3.5" />
+                    Editar Conteúdo
+                  </button>
+
+                  <button
+                    onClick={() => handleDelete(course.id)}
+                    className="p-2.5 rounded-[980px] bg-white/5 hover:bg-red-500/20 text-gray-400 hover:text-red-400 transition-colors"
+                    title="Excluir Curso"
+                  >
+                    <Trash2 className="w-4 h-4" />
+                  </button>
+                </div>
+              </div>
+            );
+          })}
+        </div>
+      )}
+
+      {/* Tab: Comments / Questions */}
+      {activeTab === 'comments' && (
+        <div className="space-y-4 max-w-4xl">
+          {allComments.length === 0 ? (
+            <div className="text-center py-20 text-gray-500">
+              <MessageSquare className="w-12 h-12 mx-auto mb-3 opacity-30 text-orange-400" />
+              <p className="text-body-sm font-normal text-gray-400">Nenhuma dúvida enviada por alunos até o momento.</p>
+            </div>
+          ) : (
+            allComments.map(({ comment, courseTitle }) => (
+              <div key={comment.id} className="p-6 rounded-[8px] bg-zinc-900/60 border border-white/10 space-y-4 shadow-xl">
+                <div className="flex items-center justify-between">
+                  <div>
+                    <span className="text-caption text-orange-400 font-semibold uppercase tracking-caption">{courseTitle}</span>
+                    <h4 className="font-semibold text-white text-body-sm tracking-body-sm">{comment.user}</h4>
+                  </div>
+                  <span className="text-caption text-gray-500 font-mono">{comment.date}</span>
+                </div>
+
+                <p className="text-body-sm text-gray-300 bg-black/30 p-3.5 rounded-[8px] border border-white/5 leading-body-sm tracking-body-sm font-normal">
+                  {comment.text}
+                </p>
+
+                {comment.reply ? (
+                  <div className="pl-4 border-l-2 border-orange-500 bg-white/[0.02] p-3 rounded-r-[8px]">
+                    <span className="text-caption font-semibold text-orange-400 uppercase tracking-caption">Sua Resposta ({comment.replyDate}):</span>
+                    <p className="text-body-sm text-gray-200 mt-1 leading-body-sm">{comment.reply}</p>
+                  </div>
+                ) : (
+                  <div>
+                    {replyingTo === comment.id ? (
+                      <div className="space-y-3 pt-2">
+                        <textarea
+                          value={replyText}
+                          onChange={(e) => setReplyText(e.target.value)}
+                          placeholder="Escreva a resposta para o aluno..."
+                          className="w-full bg-black/60 border border-white/10 rounded-[8px] p-3 text-body-sm text-white focus:outline-none focus:border-orange-500/50 resize-none"
+                          rows={3}
+                        />
+                        <div className="flex items-center justify-between">
+                          <button
+                            type="button"
+                            onClick={() => handleGenerateAIReply(comment.text, courseTitle)}
+                            disabled={isGeneratingReply}
+                            className="inline-flex items-center gap-1.5 text-body-sm text-orange-400 hover:text-orange-300 font-semibold"
+                          >
+                            <Sparkles className="w-3.5 h-3.5" />
+                            {isGeneratingReply ? 'Gerando com IA...' : 'Sugerir Resposta com IA'}
+                          </button>
+
+                          <div className="flex gap-2">
+                            <button
+                              onClick={() => { setReplyingTo(null); setReplyText(''); }}
+                              className="px-3.5 py-2 rounded-[980px] text-body-sm text-gray-400 hover:text-white font-semibold"
+                            >
+                              Cancelar
+                            </button>
+                            <button
+                              onClick={() => handleSendReply(comment.id)}
+                              className="px-5 py-2 rounded-[980px] bg-orange-500 hover:bg-orange-600 text-white text-body-sm font-semibold tracking-body-sm shadow-xl"
+                            >
+                              Enviar Resposta
+                            </button>
+                          </div>
+                        </div>
+                      </div>
+                    ) : (
+                      <button
+                        onClick={() => setReplyingTo(comment.id)}
+                        className="text-body-sm font-semibold text-orange-400 hover:text-orange-300 tracking-body-sm"
+                      >
+                        Responder Dúvida &rarr;
+                      </button>
+                    )}
+                  </div>
+                )}
+              </div>
+            ))
+          )}
+        </div>
+      )}
+
+      {/* Create/Edit Modal */}
+      <CourseModal 
+        isOpen={isModalOpen}
+        onClose={() => setIsModalOpen(false)}
+        onSave={handleSave}
+        initialData={editingCourse}
+      />
+    </div>
+  );
+};