/* CSS Puro - Variáveis e Reset */
/* CSS Puro - Variáveis e Modo Escuro */
:root {
  --bg-color: #f8fafc;
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --text-main: #1f2937;
  --text-muted: #6b7280;
  --card-bg: #ffffff;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --gray-light: #e5e7eb;
  --nav-height: 60px;
}

body.dark-mode {
  --bg-color: #0f172a; /* Fundo principal escuro */
  --card-bg: #1e293b;  /* Fundo de elementos e balões */
  --text-main: #f8fafc; /* Texto claro */
  --text-muted: #94a3b8; /* Texto secundário */
  --gray-light: #334155; /* Bordas no modo escuro */
  --primary-color: #3b82f6; /* Azul ligeiramente mais claro para contraste */
  --primary-hover: #60a5fa;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Poppins', sans-serif;
}

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Utilitários */
.hidden { display: none !important; }
.fade-in { animation: fadeIn 0.3s ease-in-out; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* Header */
header {
  background-color: var(--card-bg);
  padding: 15px 20px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 10;
}

.user-info { display: flex; flex-direction: column; }
.user-name { font-weight: 600; font-size: 1.1rem; color: var(--primary-color); }
.user-class { font-size: 0.8rem; color: var(--text-muted); }

.btn {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 500;
  transition: background 0.2s;
}
.btn:hover { background-color: var(--primary-hover); }
.btn-outline { background: transparent; border: 1px solid var(--primary-color); color: var(--primary-color); }
.btn-outline:hover { background: var(--primary-color); color: white; }

/* Layout Principal */
main {
  flex: 1;
  padding: 20px;
  padding-bottom: calc(var(--nav-height) + 20px);
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}

/* View: Login */
#view-login {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 80vh;
  text-align: center;
}
.login-box {
  background: var(--card-bg);
  padding: 40px;
  border-radius: 16px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.05);
  width: 100%;
  max-width: 400px;
}
.login-box h1 { color: var(--primary-color); margin-bottom: 20px; font-size: 1.5rem; }
.input-group { margin-bottom: 15px; text-align: left; }
.input-group label { display: block; font-size: 0.9rem; margin-bottom: 5px; font-weight: 500; }
.input-group input, .input-group select {
  width: 100%; padding: 10px; border: 1px solid var(--gray-light); border-radius: 8px; font-size: 1rem;
}
.login-box button { width: 100%; margin-top: 10px; padding: 12px; font-size: 1rem; }

/* View: Home (Mapa de Habilidades) */
.motivational-msg {
  background: linear-gradient(135deg, var(--primary-color), #60a5fa);
  color: white;
  padding: 15px 20px;
  border-radius: 12px;
  margin-bottom: 20px;
  font-weight: 500;
}

.section-title { font-size: 1.2rem; font-weight: 600; margin-bottom: 15px; }

.skills-grid { display: grid; grid-template-columns: 1fr; gap: 15px; }
@media(min-width: 600px) { .skills-grid { grid-template-columns: 1fr 1fr; } }

.skill-card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 15px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  position: relative;
  border-left: 5px solid var(--gray-light);
}
.skill-card:hover:not(.locked) { transform: translateY(-3px); box-shadow: 0 4px 8px rgba(0,0,0,0.1); }
.skill-card.status-novo { border-left-color: var(--warning); }
.skill-card.status-revisar { border-left-color: var(--danger); }
.skill-card.status-concluido { border-left-color: var(--success); }

.skill-card.locked { opacity: 0.6; cursor: not-allowed; }
.skill-title { font-weight: 600; font-size: 1rem; margin-bottom: 5px; padding-right: 20px; }
.skill-desc { font-size: 0.8rem; color: var(--text-muted); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.badge { display: inline-block; padding: 3px 8px; border-radius: 12px; font-size: 0.7rem; font-weight: 600; margin-top: 10px; color: white; }
.badge.novo { background: var(--warning); color: #fff; }
.badge.revisar { background: var(--danger); }
.badge.concluido { background: var(--success); }
.lock-icon { position: absolute; top: 15px; right: 15px; font-size: 1.2rem; }

/* View: Tutor Socrático (Chat) */
/* Formato geral dos balões */
/* Contentor do Chat (Controla o espaço entre as mensagens) */
.chat-container {
  display: flex;
  flex-direction: column;
  gap: 15px; /* É ESTE NÚMERO QUE CONTROLA O ESPAÇO VERTICAL */
  padding-bottom: 20px; /* Dá um pequeno respiro no final das mensagens */
}

.chat-bubble {
  padding: 14px 18px; 
  border-radius: 18px; 
  font-size: 1rem;
  line-height: 1.5;
  animation: fadeIn 0.3s ease-out;
  box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

/* O Balão do Tutor com o Avatar do Robô */
.chat-bubble.tutor {
  background: var(--card-bg);
  color: var(--text-main);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
  border: 1px solid var(--gray-light);
  position: relative;
  margin-left: 45px; /* Espaço para o avatar */
  max-width: calc(90% - 45px); /* Previne cortes no ecrã */
}

/* Criar a "foto" do robô via CSS */
.chat-bubble.tutor::before {
  content: "🤖";
  position: absolute;
  left: -45px;
  bottom: 0px;
  width: 36px;
  height: 36px;
  background: var(--card-bg);
  border: 2px solid var(--primary-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* O Balão do Aluno */
.chat-bubble.user {
  background: linear-gradient(135deg, var(--primary-color), #3b82f6);
  color: white;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
  position: relative;
  margin-right: 45px;
  max-width: calc(90% - 45px);
}

/* Avatar do Aluno */
.chat-bubble.user::after {
  content: "🎓"; /* Ícone do aluno */
  position: absolute;
  right: -45px;
  bottom: 0px;
  width: 36px;
  height: 36px;
  background: var(--primary-color);
  border: 2px solid var(--card-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Botões de Múltipla Escolha (Adaptados para o Dark Mode) */
/* Container das opções (Empurra os botões para o lado direito) */
.options-container { 
  display: flex; 
  flex-direction: column; 
  align-items: flex-end; /* Joga as opções para a direita */
  gap: 10px; 
  margin-top: 10px; 
}

/* Botões de Múltipla Escolha (Restaurando o Azul) */
.option-btn {
  background: var(--card-bg);
  border: 1px solid var(--primary-color); /* Volta para a borda Azul */
  color: var(--primary-color); /* Texto Azul */
  padding: 12px 16px;
  border-radius: 16px;
  border-bottom-right-radius: 4px; /* Canto reto para combinar com o balão do aluno */
  text-align: left; /* Mantém o texto alinhado à esquerda para facilitar a leitura */
  cursor: pointer;
  transition: all 0.2s ease-in-out;
  font-size: 0.95rem;
  font-weight: 500;
  max-width: 90%; /* Limita a largura para não colar no lado do tutor */
}

/* Efeito ao passar o rato (Hover) */
.option-btn:hover {
  background: var(--primary-color); /* Preenche de azul sólido */
  color: #ffffff; /* O texto fica branco */
  border-color: var(--primary-color);
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(37, 99, 235, 0.25); /* Sombra azulada */
}

/* Formatação de listas dentro do chat (Estilo Word) */
.chat-bubble ul, .chat-bubble ol {
  margin-top: 10px;
  margin-bottom: 10px;
  padding-left: 25px; /* Cria o recuo da lista */
}

.chat-bubble li {
  margin-bottom: 8px; /* Dá um respiro entre um tópico e outro */
  line-height: 1.5;
}

/* Negrito mais elegante no chat */
.chat-bubble strong {
  color: var(--primary-color); /* Deixa as palavras em negrito com a cor azul do tema */
}

/* View: Dashboard */
.stats-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin-bottom: 20px; }
.stat-card { background: var(--card-bg); padding: 15px; border-radius: 12px; text-align: center; box-shadow: 0 1px 3px rgba(0,0,0,0.05); }
.stat-value { font-size: 1.5rem; font-weight: 700; color: var(--primary-color); }
.stat-label { font-size: 0.8rem; color: var(--text-muted); }

.chart-container { background: var(--card-bg); padding: 15px; border-radius: 12px; margin-bottom: 20px; position: relative; height: 300px; width: 100%; }

.history-table { width: 100%; border-collapse: collapse; background: var(--card-bg); border-radius: 12px; overflow: hidden; font-size: 0.85rem; }
.history-table th, .history-table td { padding: 10px; text-align: left; border-bottom: 1px solid var(--gray-light); }
.history-table th { background: var(--gray-light); font-weight: 600; }

.achievements-container { display: flex; gap: 10px; overflow-x: auto; padding: 10px 0; }
.achievement { background: var(--card-bg); padding: 10px; border-radius: 8px; display: flex; flex-direction: column; align-items: center; min-width: 100px; opacity: 0.5; filter: grayscale(1); transition: all 0.3s; }
.achievement.unlocked { opacity: 1; filter: grayscale(0); box-shadow: 0 2px 4px rgba(0,0,0,0.1); }
.achievement-icon { font-size: 1.5rem; margin-bottom: 5px; }
.achievement-text { font-size: 0.7rem; text-align: center; }

/* Navegação Inferior Corrigida */
nav {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: var(--card-bg);
  /* Altura fixa rigorosa considerando bordas de telemóveis */
  height: calc(var(--nav-height) + env(safe-area-inset-bottom, 0px));
  padding-bottom: env(safe-area-inset-bottom, 0px);
  display: flex;
  justify-content: space-around;
  align-items: center;
  box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
  z-index: 100;
  box-sizing: border-box;
}

.nav-item { 
  display: flex; 
  flex-direction: column; 
  align-items: center; 
  justify-content: center;
  color: var(--text-muted); 
  text-decoration: none; 
  font-size: 0.75rem; 
  cursor: pointer; 
  transition: color 0.2s; 
  flex: 1; 
  height: 100%; 
}

.nav-item.active { 
  color: var(--primary-color); 
  /* Substituímos o font-weight:600 por text-shadow. 
     O bold engrossava o botão e fazia a barra tremer! */
  text-shadow: 0 0 0.5px var(--primary-color);
}

.nav-item { display: flex; flex-direction: column; align-items: center; color: var(--text-muted); text-decoration: none; font-size: 0.75rem; cursor: pointer; transition: color 0.2s; flex: 1; padding: 10px 0; }
.nav-item.active { color: var(--primary-color); font-weight: 600; }
.nav-icon { font-size: 1.2rem; margin-bottom: 2px; }
/* ============================================================
   ADIÇÕES DA REESTRUTURAÇÃO
   ============================================================ */

/* View: Estudo — cabeçalho e barra de progresso (existiam no HTML/JS
   mas não tinham nenhuma regra CSS, então a barra era invisível) */
.study-header {
  position: sticky;
  top: var(--nav-height, 0px);
  background: var(--bg-color);
  padding: 10px 0 15px 0;
  margin-bottom: 5px;
  z-index: 5;
}
.progress-bar-container {
  width: 100%;
  height: 8px;
  background: var(--gray-light);
  border-radius: 999px;
  margin-top: 8px;
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  width: 10%;
  background: linear-gradient(90deg, var(--primary-color), var(--success));
  border-radius: 999px;
  transition: width 0.4s ease-out;
}

/* Balão do "Desafio Final" — antes era um background inline fixo (#e0f2fe)
   que ficava claro demais / ilegível no modo escuro. */
.chat-bubble.desafio-final {
  background: color-mix(in srgb, var(--primary-color) 12%, var(--card-bg));
  border-color: var(--primary-color);
}

/* Overlay de carregamento inicial (busca de conteúdo/progresso) */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-color);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.loading-box { text-align: center; color: var(--text-muted); }
.loading-spinner {
  width: 40px; height: 40px;
  border: 4px solid var(--gray-light);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  margin: 0 auto 15px auto;
  animation: girar 0.8s linear infinite;
}
@keyframes girar { to { transform: rotate(360deg); } }

/* Indicador de sincronização com a planilha (header) */
.sync-status {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 2px;
}
.sync-status.sync-ok { color: var(--success); }
.sync-status.sync-off { color: var(--text-muted); }
.sync-status.sync-pending { color: var(--warning); }