CSS Responsive Layout & Media Query Generator

/* Mobile first layout */
.grid-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 768px) {
  .grid-container {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-container {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }
}

@container (min-width: 400px) {
  .card { padding: 1.5rem; }
}