@media (max-width: 1120px) {
  .app-shell { grid-template-columns: minmax(430px, .96fr) minmax(390px, 1.04fr); }
}

@media (max-width: 980px) {
  .app-shell { width: min(780px, calc(100% - 28px)); grid-template-columns: 1fr; gap: 22px; }
  .canvas-stage { min-height: 0; contain: none; }
  .footer { width: min(780px, calc(100% - 28px)); }
}

@media (max-width: 640px) {
  .navbar, .navbar-container { min-height: 64px; }
  .navbar-container { width: calc(100% - 30px); }
  .app-shell { margin-top: 16px; gap: 18px; }
  .editor-panel, .preview-panel { padding: 18px; border-radius: 17px; }
  .panel-heading { align-items: center; flex-wrap: wrap; }
  .editor-group { margin-top: 21px; }
  .editor-group + .editor-group { padding-top: 20px; }
  .form-grid, .display-settings-grid, .stamp-settings-grid { grid-template-columns: 1fr; }
  .field-span-2 { grid-column: auto; }
  .actions { grid-template-columns: 1fr; }
  .preview-toolbar { min-height: 0; margin-bottom: 14px; flex-wrap: wrap; }
  .canvas-stage { min-height: 0; padding: 14px; border-radius: 17px; }
  .canvas-surface { width: 100%; }
  .footer { flex-direction: column; gap: 4px; }
  .date-time-popover {
    position: fixed;
    top: 50%;
    left: 50%;
    width: min(360px, calc(100vw - 28px));
    max-height: calc(100dvh - 36px);
    transform: translate(-50%, -50%);
    border-radius: 18px;
  }
  .date-time-trigger-copy { gap: 6px; }
}

@media (max-width: 390px) {
  .editor-panel, .preview-panel { padding: 16px; }
  .switch-card { padding-inline: 10px; }
  .button.small { padding-inline: 12px; }
  .preview-actions { width: 100%; justify-content: flex-end; }
  .stamp-upload-row { grid-template-columns: 1fr; }
  .stamp-clear-button { width: 100%; }
  .date-time-clock-row { align-items: stretch; flex-direction: column; }
  .date-time-clock-inputs { justify-content: space-between; }
}


@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}