:root {
  --color-paper: #f4f1e8;
  --color-paper-deep: #ece7d9;
  --color-ink: #1c1b18;
  --color-ink-soft: #6b665b;
  --color-line: #d9d3c3;
  --color-accent: #d8442a;
  --color-accent-deep: #b0331d;
  --color-mark: #e0a92e;
  --font-display: Inter, Noto Sans TC, sans-serif;
  --font-body: Inter, Noto Sans TC, sans-serif;
  --font-mono: Inter, Noto Sans TC, sans-serif;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

.tool-intro {
  max-width: 64ch;
  margin-block: 24px 16px;
  color: #6b665b;
}

.mode-tabs {
  display: inline-flex;
  gap: 0;
  margin-bottom: 24px;
  border: 1.5px solid #1c1b18;
  border-radius: 2px;
  overflow: hidden;
}

.mode-tab {
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  letter-spacing: 0.04em;
  padding: 8px 24px;
  background: transparent;
  color: #6b665b;
  transition: background-color 0.4s cubic-bezier(0.22, 0.61, 0.36, 1), color 0.4s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.mode-tab + .mode-tab {
  border-left: 1.5px solid #1c1b18;
}
.mode-tab:hover {
  color: #1c1b18;
}
.mode-tab.is-active {
  background: #1c1b18;
  color: #f4f1e8;
}

.sim-layout {
  display: grid;
  grid-template-columns: minmax(260px, 320px) 1fr;
  gap: 40px;
  align-items: start;
}
@media (max-width: 760px) {
  .sim-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

.sim-controls {
  display: grid;
  gap: 24px;
}

.control-group {
  display: grid;
  gap: 8px;
}

.control-label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  letter-spacing: 0.04em;
  color: #1c1b18;
}

.control-value {
  color: #d8442a;
}

.seg {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.seg-btn {
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  padding: 4px 8px;
  background: #ece7d9;
  border: 1px solid #d9d3c3;
  border-radius: 2px;
  color: #6b665b;
  transition: border-color 0.4s cubic-bezier(0.22, 0.61, 0.36, 1), color 0.4s cubic-bezier(0.22, 0.61, 0.36, 1), background-color 0.4s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.seg-btn:hover {
  color: #1c1b18;
  border-color: #1c1b18;
}
.seg-btn.is-active {
  color: #d8442a;
  border-color: #d8442a;
  background: color-mix(in srgb, #d8442a 8%, #ece7d9);
}

.control-range {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 2px;
  background: #d9d3c3;
  cursor: pointer;
}
.control-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #d8442a;
  border: 2px solid #f4f1e8;
}
.control-range::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border: 2px solid #f4f1e8;
  border-radius: 50%;
  background: #d8442a;
}

.stage-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.count-control {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.count-label {
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  letter-spacing: 0.04em;
  color: #6b665b;
}

.count-btn {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1.25rem;
  line-height: 1;
  background: transparent;
  border: 1.5px solid #1c1b18;
  border-radius: 2px;
  transition: background-color 0.4s cubic-bezier(0.22, 0.61, 0.36, 1), color 0.4s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.count-btn:hover {
  background: #1c1b18;
  color: #f4f1e8;
}

.count-value {
  min-width: 1.5em;
  text-align: center;
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  color: #d8442a;
}

.sim-stage {
  min-height: 300px;
  padding: 16px;
  background: #ece7d9;
  border: 1.5px solid #1c1b18;
  border-radius: 2px;
  background-image: linear-gradient(45deg, #d9d3c3 25%, transparent 25%), linear-gradient(-45deg, #d9d3c3 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #d9d3c3 75%), linear-gradient(-45deg, transparent 75%, #d9d3c3 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}

.stage-box {
  display: grid;
  place-items: center;
  min-width: 48px;
  min-height: 48px;
  padding: 8px 16px;
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  color: #f4f1e8;
  background: #d8442a;
  border-radius: 2px;
  box-shadow: 2px 2px 0 #1c1b18;
}

.code-block {
  position: relative;
}

.code-copy {
  position: absolute;
  top: 16px;
  right: 16px;
}

.code-out {
  margin: 0;
  padding: 24px;
  padding-right: 140px;
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  color: #1c1b18;
  background: #ece7d9;
  border: 1px solid #d9d3c3;
  border-radius: 2px;
  white-space: pre-wrap;
  word-break: break-word;
}