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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.stage {
  position: relative;
}

.bph {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.bph__field {
  position: relative;
  width: 220px;
  height: 168px;
}

.bph__pivot {
  position: absolute;
  left: 50%;
  top: 0;
  width: 10px;
  height: 10px;
  margin-left: -5px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.5);
}

.bph__arm {
  position: absolute;
  left: 50%;
  top: 0;
  width: 2px;
  height: 110px;
  transform-origin: 50% 0%;
}

.bph__rod {
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 100%;
  background: rgba(255, 255, 255, 0.35);
}

.bph__btn {
  position: absolute;
  left: 50%;
  bottom: -22px;
  margin-left: -22px;
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 999px;
  background: #ff9ebb;
  color: #17141a;
  font-size: 15px;
  font-weight: 700;
  cursor: grab;
  touch-action: none;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}

.bph__hint {
  color: rgba(255, 255, 255, 0.72);
  font-size: 12px;
  text-align: center;
  max-width: 220px;
}

@media (max-width: 340px) {
  .bph__field {
    width: 160px;
    height: 96px;
  }
  .bph__arm {
    height: 56px;
  }
  .bph__btn {
    width: 32px;
    height: 32px;
    bottom: -16px;
    margin-left: -16px;
    font-size: 12px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .bph__arm {
    transition: none !important;
  }
}