/* =========================
   RESET GLOBAL
========================= */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

/* =========================
   BASE
========================= */
body {
  background: #0f172a;
  color: #ffffff;
  line-height: 1.6;
}

main {
  padding: 20px;
}

/* =========================
   HEADER (COMPARTILHADO)
========================= */
header {
  text-align: center;
  padding: 40px;
  background: linear-gradient(90deg, #1e3a8a, #9333ea);
}

header h1 {
  font-size: 2.5rem;
}

header p {
  margin-top: 10px;
  opacity: 0.9;
}

/* =========================
   FOOTER
========================= */
footer {
  text-align: center;
  padding: 20px;
  background: #020617;
  margin-top: 40px;
}

/* =========================
   BOTÕES
========================= */
.btn {
  display: inline-block;
  text-decoration: none;
  background: #22c55e;
  color: #000;
  padding: 10px 15px;
  border-radius: 8px;
  font-weight: bold;
  transition: 0.3s;
}

.btn:hover {
  background: #16a34a;
}

/* =========================
   ===== HOME (CARDS) =====
========================= */

.categoria {
  margin-bottom: 40px;
}

.categoria h2 {
  margin-bottom: 15px;
}

.cards {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.card {
  background: #1e293b;
  padding: 20px;
  border-radius: 15px;
  width: 250px;
  transition: 0.3s;
}

.card:hover {
  transform: scale(1.05);
  background: #334155;
}

.card h3 {
  margin-bottom: 10px;
}

.card p {
  font-size: 0.9rem;
  margin-bottom: 15px;
  opacity: 0.85;
}

/* =========================
   ===== AULAS =====
========================= */

.container {
  max-width: 900px;
  margin: auto;
}

/* Seções */
section {
  margin-bottom: 40px;
}

section h2 {
  margin-bottom: 15px;
  color: #22c55e;
}

/* Caixa de conteúdo */
.box {
  background: #1e293b;
  padding: 20px;
  border-radius: 15px;
}

/* Imagens */
img {
  width: 100%;
  border-radius: 10px;
  margin: 15px 0;
}

/* Listas */
ul {
  padding-left: 20px;
}

li {
  margin-bottom: 8px;
}

/* Destaque */
.highlight {
  background: #334155;
  padding: 15px;
  border-left: 5px solid #22c55e;
  border-radius: 10px;
  margin-top: 10px;
}

/* Botão voltar */
.voltar {
  margin-top: 20px;
}

/* =========================
   RESPONSIVO
========================= */

@media (max-width: 768px) {
  header h1 {
    font-size: 2rem;
  }

  .cards {
    flex-direction: column;
    align-items: center;
  }

  .card {
    width: 90%;
  }
}