:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #1d4ed8;
  --primary-soft: #dbeafe;
  --border: #e5e7eb;
  --success-bg: #dcfce7;
  --success-text: #166534;
  --error-bg: #fee2e2;
  --error-text: #991b1b;
  --seguranca: #fef3c7;
  --educacao: #dcfce7;
  --tecnologia: #e0e7ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container {
  width: min(960px, 92%);
  margin: 0 auto;
}

.topo {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 2rem 0 1.5rem;
  position: sticky;
  top: 0;
  z-index: 10;
}

.topo h1 {
  margin: 0 0 0.4rem;
  font-size: clamp(1.3rem, 2vw, 1.8rem);
}

.subtitulo {
  margin: 0 0 0.8rem;
  color: var(--muted);
  font-weight: 600;
}

.barra-progresso {
  width: 100%;
  height: 12px;
  background: #edf2f7;
  border-radius: 999px;
  overflow: hidden;
}

.barra-progresso-preenchimento {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), #2563eb);
  transition: width 0.25s ease;
}

.principal {
  padding: 2rem 0 3rem;
  display: grid;
  gap: 1.2rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.25rem;
}

.tag-aula {
  display: inline-flex;
  padding: 0.2rem 0.7rem;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.aula h2 {
  margin: 0 0 0.25rem;
}

.aula h3 {
  margin: 0 0 0.8rem;
  color: var(--muted);
  font-size: 1rem;
}

.grid-exemplos {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.exemplo h4 {
  margin: 0 0 0.55rem;
}

.exemplo-seguranca {
  background: var(--seguranca);
}

.exemplo-educacao {
  background: var(--educacao);
}

.exemplo-tecnologia {
  background: var(--tecnologia);
}

.quiz .pergunta {
  font-weight: 600;
}

.analise-especialista {
  border-left: 4px solid var(--primary);
}

.frase-destaque {
  margin: 1rem 0;
  padding: 1rem 1.2rem;
  border-left: 4px solid var(--primary);
  background: #eff6ff;
  border-radius: 8px;
  font-style: italic;
}

.grid-analise {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.grid-analise ul {
  margin: 0;
  padding-left: 1.2rem;
}

.grid-analise li + li {
  margin-top: 0.45rem;
}

.laboratorio-frases {
  border-left: 4px solid #0f766e;
}

.comando-lab {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.8rem;
}

.form-laboratorio {
  display: grid;
  gap: 0.8rem;
}

.acoes-laboratorio {
  display: flex;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.form-laboratorio textarea {
  width: 100%;
  resize: vertical;
  padding: 0.85rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  font: inherit;
  background: #fff;
  color: var(--text);
}

.feedback-lab {
  margin-top: 1rem;
  border-radius: 10px;
  padding: 0.9rem;
  border: 1px solid var(--border);
  background: #f8fafc;
}

.feedback-lab.aguardando {
  background: #eff6ff;
  color: #1e3a8a;
  border-color: #bfdbfe;
}

.feedback-lab.aprovado {
  background: var(--success-bg);
  color: var(--success-text);
  border-color: #86efac;
}

.feedback-lab.reprovado,
.feedback-lab.erro {
  background: var(--error-bg);
  color: var(--error-text);
  border-color: #fca5a5;
}

.form-quiz {
  display: grid;
  gap: 0.7rem;
}

.opcao-quiz {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  background: #f8fafc;
  border: 1px solid var(--border);
  padding: 0.7rem 0.8rem;
  border-radius: 10px;
}

.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 42px;
  padding: 0.65rem 1rem;
  border-radius: 10px;
  border: 1px solid transparent;
  text-decoration: none;
  font-weight: 600;
}

.btn-primario {
  background: var(--primary);
  color: #fff;
}

.btn-secundario {
  background: #fff;
  border-color: var(--border);
  color: var(--text);
}

.btn-desabilitado {
  background: #e5e7eb;
  color: #6b7280;
  cursor: not-allowed;
}

.btn-concluido {
  background: #d1fae5;
  color: #065f46;
}

.feedback {
  margin-top: 1rem;
  border-radius: 10px;
  padding: 0.8rem;
  font-weight: 600;
}

.feedback.sucesso {
  background: var(--success-bg);
  color: var(--success-text);
}

.feedback.erro {
  background: var(--error-bg);
  color: var(--error-text);
}

.navegacao {
  display: flex;
  gap: 0.8rem;
  justify-content: space-between;
  flex-wrap: wrap;
}

@media (max-width: 860px) {
  .grid-exemplos {
    grid-template-columns: 1fr;
  }

  .grid-analise {
    grid-template-columns: 1fr;
  }

  .topo {
    position: static;
  }

  .acoes-laboratorio .btn {
    width: 100%;
  }
}