.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin: 40px auto;
}
.btn {
  display: block;
  padding: 16px;
  background: #161a22;
  color: #e8eaf0;
  text-decoration: none;
  border-radius: 10px;
  border: 1px solid #263041;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  text-align: center;
  font-weight: bold;
  transition: background 0.3s, transform 0.2s;
}
.btn:hover {
  background: #00e5a8;
  color: #0f1115;
  transform: translateY(-3px);
}