:root {
  color-scheme: light;
  --paper: #f3efe6;
  --ink: #17211b;
  --muted: #687266;
  --panel: #fffdfa;
  --line: #d9d0c0;
  --green: #285f50;
  --green-soft: #d6f2ad;
  --gold: #d9a846;
  --rust: #a65335;
  --shadow: 0 28px 80px rgba(30, 32, 26, 0.16);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: ui-serif, Georgia, "Times New Roman", "Noto Serif TC", serif;
  color: var(--ink);
  background:
    linear-gradient(135deg, rgba(40, 95, 80, 0.13), transparent 42%),
    linear-gradient(315deg, rgba(217, 168, 70, 0.2), transparent 44%),
    var(--paper);
}

button,
input,
a {
  font: inherit;
}

.demo-shell {
  width: min(1220px, 100%);
  margin: 0 auto;
  padding: 28px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  margin-bottom: 24px;
  color: var(--muted);
  font-size: 15px;
}

.topbar a {
  color: var(--green);
  font-weight: 700;
  text-decoration: none;
}

.demo-panel {
  min-height: 460px;
  display: grid;
  grid-template-columns: minmax(240px, 300px) minmax(0, 1fr);
  gap: 24px;
  align-items: stretch;
}

.demo-copy,
.range-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 253, 250, 0.94);
  box-shadow: var(--shadow);
}

.demo-copy {
  display: grid;
  align-content: start;
  gap: 24px;
  padding: 24px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--rust);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  max-width: 100%;
  font-size: clamp(32px, 3vw, 46px);
  line-height: 1.02;
  letter-spacing: 0;
}

.readout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.readout div {
  min-height: 92px;
  display: grid;
  align-content: space-between;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8f3e8;
}

.readout span,
.number-row span {
  color: var(--muted);
  font-size: 14px;
}

.readout strong {
  font-size: 34px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.range-card {
  display: grid;
  align-content: center;
  gap: 28px;
  min-height: 460px;
  padding: clamp(28px, 5vw, 58px);
}

.range-meter {
  --lower: 30%;
  --upper: 75%;
  position: relative;
  height: 84px;
}

.range-meter::before,
.range-meter #rangeFill {
  content: "";
  position: absolute;
  top: 38px;
  height: 10px;
  border-radius: 999px;
}

.range-meter::before {
  left: 0;
  right: 0;
  background: #ded6c6;
  box-shadow: inset 0 1px 2px rgba(23, 33, 27, 0.18);
}

.range-meter #rangeFill {
  left: var(--lower);
  right: calc(100% - var(--upper));
  background: linear-gradient(90deg, var(--green), var(--gold));
}

.range-meter input[type="range"] {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 84px;
  margin: 0;
  appearance: none;
  background: transparent;
  pointer-events: none;
}

.range-meter input[type="range"]::-webkit-slider-runnable-track {
  height: 10px;
  background: transparent;
}

.range-meter input[type="range"]::-webkit-slider-thumb {
  width: 34px;
  height: 34px;
  margin-top: -12px;
  appearance: none;
  border: 3px solid #fffdfa;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 7px 18px rgba(23, 33, 27, 0.26);
  cursor: grab;
  pointer-events: auto;
}

.range-meter input[type="range"]::-moz-range-track {
  height: 10px;
  background: transparent;
}

.range-meter input[type="range"]::-moz-range-thumb {
  width: 30px;
  height: 30px;
  border: 3px solid #fffdfa;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 7px 18px rgba(23, 33, 27, 0.26);
  cursor: grab;
  pointer-events: auto;
}

#upperRange::-webkit-slider-thumb {
  background: var(--gold);
}

#upperRange::-moz-range-thumb {
  background: var(--gold);
}

.tick-row {
  position: relative;
  min-height: 18px;
  color: var(--muted);
  font-size: 13px;
}

.tick-row span {
  position: absolute;
  top: 0;
  transform: translateX(-50%);
  white-space: nowrap;
}

.number-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.number-row label {
  display: grid;
  gap: 8px;
}

.number-row input {
  width: 100%;
  min-height: 52px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fffdfa;
  color: var(--ink);
  font-size: 22px;
  font-variant-numeric: tabular-nums;
}

.range-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding-top: 4px;
}

.range-summary span {
  color: var(--green);
  font-size: 22px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.range-summary span::before {
  content: "範圍 ";
  color: var(--muted);
  font-size: 15px;
  font-weight: 400;
}

.range-summary button {
  min-width: 96px;
  min-height: 44px;
  border: 0;
  border-radius: 6px;
  background: var(--ink);
  color: #fffdfa;
  cursor: pointer;
}

@media (max-width: 760px) {
  .demo-shell {
    padding: 16px;
  }

  .demo-panel {
    grid-template-columns: 1fr;
  }

  .demo-copy {
    min-height: 0;
  }

  h1 {
    font-size: 42px;
  }

  .readout {
    grid-template-columns: 1fr 1fr;
  }
}