/* ── art preview: fixed height flex so iframe fills freed space ── */
.art-file-preview {
  background: var(--paper);
  border: 1px solid var(--bd);
  border-radius: 11px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, .05);
  display: flex;
  flex-direction: column;
  height: 540px
}

.art-file-preview iframe {
  width: 100%;
  flex: 1;
  border: none;
  display: block;
  min-height: 0
}

.art {
  display: flex;
  flex-direction: column
}

.art-body {
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex: 1
}

.art-hdr.art-hdr-collapsed {
  display: none
}