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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

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

.ser__card {
  display: grid;
  justify-items: center;
  gap: 4px;
  padding: 16px 24px;
  border-radius: 16px;
  background: #fff7e6;
  min-width: 160px;
}

.ser__label {
  font: 700 15px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: #c2361a;
}

.ser--out .ser__label {
  color: #17141a;
}

.ser__count {
  font: 600 12px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: rgba(23, 20, 26, 0.64);
  font-variant-numeric: tabular-nums;
}

.ser--out .ser__count {
  color: #c2361a;
}

.ser__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;
}
.ser__btn:active {
  transform: scale(0.96);
}

@media (max-width: 340px) {
  .ser__card {
    padding: 12px 20px;
    min-width: 140px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .ser__btn {
    transition: none;
  }
}