body {
  font-family: 'Segoe UI', sans-serif;
  margin: 0;
  padding: 0;
  background: #f8fafc;
  color: #111827;
}
h1, h2 {
  color: #1e3a8a;
}
a {
  text-decoration: none;
}
.btn {
  display: inline-block;
  margin-top: 15px;
  padding: 12px 20px;
  background: #1e3a8a;
  color: white;
  border-radius: 6px;
}
.btn:hover {
  background: #3b82f6;
}
.dashboard, .comprar {
  padding: 40px;
  text-align: center;
}
.dashboard-cards {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 30px;
  flex-wrap: wrap;
}
.card {
  background: white;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.05);
  width: 240px;
}
.comprar-form {
  margin-top: 20px;
}
select {
  padding: 10px;
  font-size: 16px;
  margin-bottom: 15px;
}