html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffffff;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.sdc {
  display: grid;
  justify-items: center;
  gap: 16px;
}

.sdc__dots {
  display: flex;
  gap: 12px;
}

.sdc__dot {
  width: 16px;
  height: 16px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.14);
  transition: background 300ms ease-out, transform 300ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.sdc__dot--idle {
  background: rgba(23, 20, 26, 0.14);
  transform: scale(1);
}

.sdc__dot--busy {
  background: #0a4fe8;
  transform: scale(1.18);
}

.sdc__dot--done {
  background: #4cd4a6;
  transform: scale(1);
}

.sdc__label {
  font: 600 13px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: rgba(23, 20, 26, 0.64);
}

.sdc__btn {
  border: 0;
  border-radius: 12px;
  padding: 8px 16px;
  background: #17141a;
  color: #fff7e6;
  font: 700 13px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  cursor: pointer;
  transition: transform 140ms ease-out;
}
.sdc__btn:active {
  transform: scale(0.96);
}

@media (max-width: 340px) {
  .sdc__dot {
    width: 12px;
    height: 12px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .sdc__dot {
    transition: none;
  }
  .sdc__btn {
    transition: none;
  }
}