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);
}

.fg {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: 100%;
  max-width: 360px;
}

.fg__hint {
  margin: 0;
  font-weight: 700;
  font-size: clamp(10px, 2.8vw, 12px);
  line-height: 1.35;
  color: #17141a;
  text-align: center;
}

.fg__track {
  position: relative;
  width: 100%;
  height: 40px;
  display: flex;
  align-items: center;
  --pct: 50;
  --sweep: 0;
}

.fg__track::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 8px;
  margin-top: -4px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.12);
}

.fg__fill {
  position: absolute;
  left: 0;
  top: 50%;
  height: 8px;
  margin-top: -4px;
  width: calc(var(--pct) * 1%);
  border-radius: 999px;
  background: #0a4fe8;
  overflow: hidden;
}

.fg__gloss {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(115deg, transparent 40%, rgba(255, 247, 230, 0.65) 50%, transparent 60%);
  background-size: 260% 100%;
  background-position: calc(var(--sweep) * 1% - 80%) 0;
}

.fg__thumb {
  position: absolute;
  top: 50%;
  left: calc(var(--pct) * 1% - 20px / 2);
  width: 20px;
  height: 20px;
  margin-top: -10px;
  border-radius: 50%;
  background: #17141a;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
}

.fg__range {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  opacity: 0;
  cursor: pointer;
}

.fg__range:focus-visible {
  outline: 2px solid #0a4fe8;
  outline-offset: 2px;
  border-radius: 999px;
}

.fg__range::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
}

.fg__range::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border: 0;
  background: transparent;
}

.fg__meta {
  margin: 0;
  font-size: clamp(9px, 2.4vw, 11px);
  color: rgba(23, 20, 26, 0.82);
}

.fg__tag {
  font-weight: 700;
  color: #0a4fe8;
  font-variant-numeric: tabular-nums;
  margin-right: 4px;
}

.fg__unit {
  color: rgba(23, 20, 26, 0.72);
}

@media (max-width: 340px) {
  .fg {
    gap: 8px;
    max-width: 280px;
  }
  .fg__hint {
    font-size: 8px;
  }
  .fg__meta {
    font-size: 7px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .fg__gloss {
    background-position: -80% 0;
  }
}