#stc-canvas {
  width: 100%;
  max-width: 380px;
  height: auto;
  aspect-ratio: 380 / 580;
  border-radius: var(--radius-md);
  box-shadow: inset 0 0 0 2px var(--color-border);
  display: block;
  margin: 0 auto;
  cursor: none;
}

.stc-controls {
  display: flex;
  gap: 14px;
  justify-content: center;
  margin-top: 14px;
}
.stc-btn {
  border: none;
  border-radius: 999px;
  padding: 16px 34px;
  font-weight: 800;
  font-size: 1.2rem;
  color: #fff;
  background: var(--color-primary-dark);
  cursor: pointer;
  user-select: none;
  touch-action: manipulation;
}
.stc-btn:active { filter: brightness(0.85); }

@media (max-width: 420px) {
  .stc-btn { padding: 14px 26px; font-size: 1.1rem; }
}