.sppv {
  width: 100%;
  height: var(--sppv-height);
  min-height: 400px;
  border: 1px solid #ccc;
  background: #525659;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  user-select: none;
}
.sppv-toolbar {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px;
  background: #333;
  color: #fff;
  font: 14px/1 sans-serif;
}
.sppv-toolbar button {
  border: 0;
  background: #555;
  color: #fff;
  min-width: 34px;
  height: 30px;
  border-radius: 3px;
  cursor: pointer;
  font-size: 18px;
}
.sppv-toolbar button:hover { background: #666; }
.sppv-page, .sppv-zoom { min-width: 65px; text-align: center; }
.sppv-status {
  padding: 20px;
  text-align: center;
  color: #fff;
  font: 14px sans-serif;
}
.sppv-pages {
  flex: 1 1 auto;
  overflow: auto;
  padding: 18px;
  text-align: center;
}
.sppv-canvas-wrap {
  display: inline-block;
  background: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,.35);
  margin: 0 auto;
}
.sppv-canvas-wrap canvas {
  display: block;
  max-width: none;
}
@media (max-width: 600px) {
  .sppv { height: 650px; }
  .sppv-toolbar { gap: 3px; padding: 5px; }
  .sppv-toolbar button { min-width: 30px; height: 28px; }
  .sppv-page, .sppv-zoom { min-width: 48px; font-size: 12px; }
}