.arc-cv {
  display: block;
  width: min(94vw, 360px);
  height: auto;
  margin: 12px auto;
  background: #1a2330;
  border-radius: 10px;
  touch-action: none;
}
.arc-ctrl {
  display: flex;
  gap: 12px;
  justify-content: center;
  align-items: center;
  margin-top: 8px;
}
.arc-ctrl > div { display: flex; gap: 8px; }
.arc-btn {
  width: 56px;
  height: 52px;
  font-size: 20px;
  border-radius: 12px;
  border: none;
  background: #2b3354;
  color: #fff;
  font-weight: 700;
}
.arc-btn:active { background: #4d96ff; }