.epub-reader {
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 10px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.epub-toolbar {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 10px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
  flex-wrap: wrap;
}

.epub-toolbar button {
  padding: 6px 10px;
  cursor: pointer;
}

.epub-toolbar .epub-toc {
  min-width: 220px;
  padding: 6px 8px;
}

.epub-progress {
  margin-left: auto;
  font-size: 14px;
  opacity: 0.85;
}

.epub-download {
  padding: 6px 10px;
  text-decoration: none;
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 8px;
}

.epub-viewer {
  flex: 1;
  min-height: 300px;
}

/* epub.js injects iframe/content, ensure it fills */
.epub-viewer iframe {
  width: 100% !important;
  height: 100% !important;
  border: 0 !important;
}