.app-header {
  position: sticky;
  z-index: 10;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1rem, 3vw, 2.25rem);
  border-bottom: 1px solid var(--color-border);
  background: color-mix(in srgb, var(--color-panel-solid) 88%, transparent);
  box-shadow: 0 8px 24px var(--color-shadow);
  backdrop-filter: blur(16px);
}

.header-actions,
.editor-actions,
.artwork-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(20rem, 0.9fr) minmax(22rem, 1.1fr);
  gap: 1.25rem;
  width: min(92rem, 100%);
  margin: 0 auto;
  padding: 1.25rem;
}

.preview-column {
  display: grid;
  align-content: start;
  gap: 1.25rem;
}

.form-grid,
.slider-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
}

.form-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.field--wide {
  grid-column: 1 / -1;
}

@media (max-width: 920px) {
  .app-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

  .app-shell {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 580px) {
  .app-shell {
    padding: 0.75rem;
  }

  .form-grid,
  .slider-grid {
    grid-template-columns: 1fr;
  }

  .field--wide {
    grid-column: auto;
  }

  .header-actions {
    width: 100%;
  }
}

.version-footer {
  width: 100%;
  box-sizing: border-box;
  padding: 0.75rem 1rem 1rem;
  color: var(--color-muted);
  font-size: 0.7rem;
  line-height: 1.2;
  text-align: center;
  opacity: 0.8;
}

.version-footer[hidden] {
  display: none;
}