.scale-layout {
  display: grid;
  grid-template-columns: minmax(250px, 330px) minmax(0, 1fr);
  gap: 18px;
  max-width: 1180px;
  margin: 0 auto;
}

.scale-panel,
.scale-stage {
  padding: 18px;
}

.scale-panel {
  display: grid;
  align-content: start;
  gap: 16px;
}

.hint {
  margin: 0;
  color: #405363;
  font-size: 1.05rem;
  font-weight: 850;
  line-height: 1.55;
}

.scale-stage {
  display: grid;
  gap: 18px;
  background: linear-gradient(160deg, rgba(255, 224, 137, 0.86), rgba(255, 253, 245, 0.94));
}

.beam-wrap {
  position: relative;
  display: grid;
  grid-template-columns: minmax(130px, 1fr) 96px minmax(130px, 1fr);
  align-items: end;
  min-height: 360px;
  padding: 34px 18px 22px;
}

.beam {
  position: absolute;
  left: 12%;
  right: 12%;
  bottom: 158px;
  height: 18px;
  border-radius: 999px;
  background: #263238;
  transform: rotate(var(--tilt, 0deg));
  transform-origin: center;
  transition: transform 220ms ease;
}

.stand {
  position: relative;
  z-index: 1;
  justify-self: center;
  width: 28px;
  height: 178px;
  border-radius: 999px 999px 12px 12px;
  background: #263238;
}

.stand::after {
  position: absolute;
  left: 50%;
  bottom: -18px;
  width: 130px;
  height: 28px;
  border-radius: 999px;
  background: #263238;
  content: "";
  transform: translateX(-50%);
}

.pan {
  position: relative;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  align-content: center;
  justify-content: center;
  gap: 8px;
  min-height: 142px;
  padding: 16px;
  border: 4px solid rgba(255, 255, 255, 0.82);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 14px 26px rgba(71, 85, 105, 0.14);
  cursor: pointer;
  transition: transform 220ms ease, background 160ms ease;
}

.left-pan {
  transform: translateY(var(--left-drop, 0px));
}

.right-pan {
  transform: translateY(var(--right-drop, 0px));
}

.pan.is-target {
  background: #dff6ff;
}

.pan-item,
.shelf-item {
  display: grid;
  place-items: center;
  min-width: 56px;
  min-height: 56px;
  border-radius: 18px;
  background: var(--item-color, #bce8d6);
  color: #263238;
  font-size: 1.45rem;
  font-weight: 950;
  box-shadow: 0 10px 18px rgba(71, 85, 105, 0.12);
}

.item-shelf {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(82px, 1fr));
  gap: 10px;
}

.shelf-item {
  width: 100%;
  min-height: 76px;
  border: 3px solid rgba(255, 255, 255, 0.76);
  cursor: pointer;
}

.shelf-item.is-selected {
  outline: 5px solid rgba(77, 163, 199, 0.48);
}

.shelf-item:disabled {
  cursor: default;
  opacity: 0.35;
}

@media (max-width: 820px) {
  .scale-layout {
    grid-template-columns: 1fr;
  }

  .beam-wrap {
    grid-template-columns: minmax(110px, 1fr) 54px minmax(110px, 1fr);
    min-height: 300px;
    padding-inline: 0;
  }

  .beam {
    left: 6%;
    right: 6%;
  }

  .pan {
    min-height: 118px;
    padding: 10px;
  }
}