@media (max-width: 900px) {
  .app {
    padding: 10px 10px 20px;
  }

  .app-header {
    flex-direction: column;
    align-items: stretch;
  }

  .header-controls {
    flex-direction: column;
    align-items: stretch;
  }

  .lens-block select,
  .slider-block input[type="range"] {
    width: 100%;
    min-width: 0;
  }

  .tab-grid.two {
    grid-template-columns: minmax(0, 1fr);
  }

  .tabs {
    padding: 12px 10px 16px;
  }

  input[type="range"] {
    width: 100%;
  }
}

@media (max-width: 600px) {
  .tabs-nav {
    gap: 4px;
  }

  .tab-btn {
    font-size: 0.72rem;
    padding: 6px 2px;
  }

  .app-header {
    padding: 12px;
  }

  .title-area h1 {
    font-size: 1.2rem;
  }
}