@media (min-width: 640px) {
  .app-shell {
    padding: 1.5rem;
  }

  .wizard-panel,
  .result-panel {
    padding: 1.35rem;
  }

  h1 {
    font-size: 3.4rem;
  }

  .option-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .format-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .app-shell {
    grid-template-columns: minmax(0, 1.35fr) minmax(20rem, 0.75fr);
    align-items: stretch;
    padding: 2rem;
  }

  .wizard-panel,
  .result-panel {
    padding: 1.5rem;
  }

  .result-panel {
    position: sticky;
    top: 2rem;
    max-height: calc(100vh - 4rem);
    overflow: auto;
  }
}

@media (min-width: 1280px) {
  h1 {
    font-size: 4rem;
  }
}