.logo-img { transition: opacity 0.3s; }
       .logo-img:hover { opacity: 0.7; }
.btn-gradient {
  display: inline-block;
  margin-top: 10px;
  padding: 10px 30px;
  font-size: 20px;
  font-weight: bold;
  color: white;
  text-decoration: none;

  background: -webkit-linear-gradient(135deg, #004488, #02386e);
  border-radius: 12px;

  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);

  transition: all 0.3s ease;
}

/* hover */
.btn-gradient:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 25px rgba(0, 0, 0, 0.822);
}

.courses-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr); /* 2 colunas fixas */
    gap: 25px;
}

@media (max-width: 768px) {
    .courses-container {
        grid-template-columns: 1fr; /* 1 por linha */
    }
}