.gear-tool {
  --n-paper: #f4f1ed;
  --n-surface: #fffdf9;
  --n-surface-soft: #f1e8e0;
  --n-ink: #2c2520;
  --n-muted: #746b64;
  --n-line: #d9ccc0;
  --n-accent: #a85437;
  --n-accent-soft: #f0d8cc;
  --n-accent-strong: #7e3b29;
  --n-on-accent: #fff;
  --n-warm: #d78d4e;
  --n-warm-soft: #f5e0c6;
  --n-danger: #b1433e;
  --n-danger-soft: #f3d8d4;
  --n-shadow: rgba(44, 37, 32, 0.12);

  background: var(--n-paper);
  border: 1px solid var(--n-line);
  border-radius: 1.35rem;
  box-shadow: 0 1rem 2.5rem var(--n-shadow);
  color: var(--n-ink);
  display: grid;
  gap: 1.25rem;
  padding: clamp(1rem, 2.5vw, 1.75rem);
}

.theme-dark .gear-tool {
  --n-paper: #111315;
  --n-surface: #191b1e;
  --n-surface-soft: #242629;
  --n-ink: #f4efe9;
  --n-muted: #b8afa7;
  --n-line: #45413e;
  --n-accent: #df8b61;
  --n-accent-soft: #503126;
  --n-accent-strong: #ffc0a0;
  --n-on-accent: #fff;
  --n-warm: #e4af65;
  --n-warm-soft: #4a3826;
  --n-danger: #ff9385;
  --n-danger-soft: #542d2b;
  --n-shadow: rgba(0, 0, 0, 0.35);
}

.gear-tool-intro {
  display: grid;
  gap: 0.3rem;
  max-width: 50rem;
}

.tool-kicker,
.eyebrow,
.scene-label {
  color: var(--n-accent);
  font-size: 0.68rem;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.gear-tool-intro p,
.educational-notice {
  color: var(--n-muted);
  font-size: 0.9rem;
  line-height: 1.5;
  margin: 0;
}

.gear-layout {
  align-items: start;
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(17rem, 0.78fr) minmax(25rem, 1.22fr);
}

.gear-controls,
.gear-visual {
  background: var(--n-surface);
  border: 1px solid var(--n-line);
  border-radius: 1.05rem;
  min-width: 0;
}

.gear-controls {
  align-self: start;
  display: grid;
  gap: 0.9rem;
  padding: 0.9rem;
}

.control-block {
  display: grid;
  gap: 0.6rem;
}

.control-block + .control-block {
  border-top: 1px solid var(--n-line);
  padding-top: 0.85rem;
}

.control-heading {
  align-items: center;
  display: flex;
  font-size: 0.78rem;
  font-weight: 850;
  gap: 0.7rem;
  justify-content: space-between;
}

.control-note {
  color: var(--n-muted);
  font-size: 0.68rem;
  font-weight: 650;
  text-align: right;
}

.profile-chips,
.unit-switch {
  display: flex;
  gap: 0.4rem;
}

.profile-chip,
.unit-button,
.reset-button {
  appearance: none;
  border: 1px solid var(--n-line);
  color: var(--n-ink);
  cursor: pointer;
  font: inherit;
}

.profile-chip {
  align-items: center;
  background: var(--n-surface-soft);
  border-radius: 0.65rem;
  display: flex;
  flex: 1;
  font-size: 0.78rem;
  gap: 0.45rem;
  justify-content: center;
  min-height: 2.45rem;
  padding: 0.45rem;
}

.profile-chip.is-active {
  background: var(--n-accent);
  border-color: var(--n-accent);
  color: var(--n-on-accent);
}

.profile-chip-mark {
  align-items: center;
  background: var(--n-paper);
  border-radius: 0.3rem;
  color: var(--n-accent-strong);
  display: inline-flex;
  font-size: 0.65rem;
  font-weight: 900;
  height: 1.25rem;
  justify-content: center;
  width: 1.25rem;
}

.unit-switch {
  background: var(--n-surface-soft);
  border: 1px solid var(--n-line);
  border-radius: 0.5rem;
  padding: 0.16rem;
}

.unit-button {
  background: transparent;
  border-color: transparent;
  border-radius: 0.32rem;
  color: var(--n-ink);
  font-size: 0.68rem;
  font-weight: 850;
  min-width: 4.1rem;
  padding: 0.36rem 0.5rem;
}

.unit-button.is-active {
  background: var(--n-accent);
  border-color: var(--n-accent);
  color: var(--n-on-accent);
}

.control-grid {
  display: grid;
  gap: 0.65rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.input-field,
.gear-input {
  color: var(--n-muted);
  display: grid;
  font-size: 0.67rem;
  font-weight: 750;
  gap: 0.28rem;
}

.input-with-unit {
  align-items: center;
  background: var(--n-surface-soft);
  border: 1px solid var(--n-line);
  border-radius: 0.55rem;
  display: flex;
  min-height: 2.45rem;
  overflow: hidden;
}

.input-with-unit input,
.gear-input input {
  background: transparent;
  border: 0;
  color: var(--n-ink);
  font: inherit;
  min-width: 0;
  outline: 0;
  padding: 0.55rem;
  width: 100%;
}

.input-with-unit:focus-within,
.gear-input:focus-within {
  border-color: var(--n-accent);
  box-shadow: 0 0 0 3px var(--n-accent-soft);
}

.input-with-unit b {
  color: var(--n-accent-strong);
  font-size: 0.62rem;
  padding-right: 0.5rem;
  white-space: nowrap;
}

.gear-input-grid {
  display: grid;
  gap: 0.45rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.gear-input {
  background: var(--n-surface-soft);
  border: 1px solid var(--n-line);
  border-radius: 0.55rem;
  gap: 0;
  overflow: hidden;
}

.gear-input span {
  border-bottom: 1px solid var(--n-line);
  color: var(--n-accent-strong);
  font-size: 0.6rem;
  padding: 0.3rem 0.45rem;
}

.reset-button {
  background: transparent;
  border-radius: 0.55rem;
  color: var(--n-muted);
  font-size: 0.68rem;
  justify-self: start;
  padding: 0.45rem 0.6rem;
}

.gear-visual {
  display: grid;
  gap: 0.85rem;
  padding: 0.9rem;
}

.gear-results {
  border-top: 1px solid var(--n-line);
  display: grid;
  gap: 0.85rem;
  padding-top: 1rem;
}

.transmission-scene {
  background: var(--n-surface-soft);
  border: 1px solid var(--n-line);
  border-radius: 0.85rem;
  overflow: hidden;
}

.scene-svg {
  display: block;
  height: auto;
  width: 100%;
}

.scene-svg text {
  fill: var(--n-muted);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.scene-road {
  fill: none;
  stroke: var(--n-line);
  stroke-width: 8;
}

.scene-shaft,
.scene-final-drive {
  fill: none;
  stroke: var(--n-accent);
  stroke-linecap: round;
  stroke-width: 13;
}

.scene-shaft {
  animation: shaft-flow var(--engine-duration, 3s) linear infinite;
  stroke-dasharray: 2 22;
}

.scene-engine {
  fill: var(--n-warm-soft);
  stroke: var(--n-warm);
  stroke-width: 8;
}

.scene-engine-core,
.scene-gear {
  fill: var(--n-accent-soft);
  stroke: var(--n-accent);
  stroke-width: 7;
}

.scene-gear {
  stroke-dasharray: 2 15;
  transform-box: fill-box;
  transform-origin: center;
}

.scene-gear-large {
  animation: gear-turn var(--engine-duration, 3s) linear infinite;
}

.scene-gear-mid {
  animation: gear-turn-reverse var(--engine-duration, 3s) linear infinite;
}

.scene-gear-small {
  animation: gear-turn var(--engine-duration, 3s) linear infinite;
}

.scene-wheel {
  animation: wheel-turn var(--wheel-duration, 2.8s) linear infinite;
  fill: var(--n-surface);
  stroke: var(--n-warm);
  stroke-width: 12;
  transform-box: fill-box;
  transform-origin: center;
}

.scene-wheel-inner,
.scene-spoke {
  fill: none;
  stroke: var(--n-warm);
  stroke-width: 4;
}

.scene-readout {
  border-top: 1px solid var(--n-line);
  padding: 0.7rem 0.9rem 0.8rem;
}

.scene-readout-row {
  display: grid;
  gap: 0.6rem;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 0.35rem;
}

.scene-readout-row span {
  color: var(--n-muted);
  display: grid;
  font-size: 0.63rem;
  gap: 0.15rem;
}

.scene-readout-row b {
  color: var(--n-ink);
  font-size: 0.82rem;
}

.motion-hint {
  border-top: 1px solid var(--n-line);
  color: var(--n-muted);
  display: flex;
  font-size: 0.65rem;
  gap: 0.5rem;
  line-height: 1.4;
  padding: 0.6rem 0.9rem 0.7rem;
}

.motion-hint strong {
  color: var(--n-accent-strong);
  white-space: nowrap;
}

.results-head {
  align-items: end;
  display: flex;
  gap: 0.75rem;
  justify-content: space-between;
}

.results-head strong {
  display: block;
  font-size: clamp(2.2rem, 5vw, 3.7rem);
  letter-spacing: -0.06em;
  line-height: 0.98;
  margin-top: 0.25rem;
}

.results-context {
  color: var(--n-muted);
  display: block;
  font-size: 0.72rem;
  margin-top: 0.35rem;
}

.status-badge {
  border-radius: 999px;
  font-size: 0.65rem;
  font-weight: 850;
  padding: 0.4rem 0.6rem;
  white-space: nowrap;
}

.status-normal {
  background: var(--n-accent-soft);
  color: var(--n-accent-strong);
}

.status-warning {
  background: var(--n-warm-soft);
  color: var(--n-warm);
}

.status-critical {
  background: var(--n-danger-soft);
  color: var(--n-danger);
}

.answer-card {
  background: var(--n-accent-soft);
  border-left: 4px solid var(--n-accent);
  border-radius: 0.75rem;
  display: grid;
  gap: 0.6rem;
  padding: 0.8rem 0.9rem;
}

.answer-grid {
  display: grid;
  gap: 0.7rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.answer-primary,
.answer-secondary {
  display: grid;
  gap: 0.15rem;
}

.answer-primary span,
.answer-secondary span {
  color: var(--n-muted);
  font-size: 0.65rem;
}

.answer-primary strong,
.answer-secondary strong {
  color: var(--n-ink);
  font-size: 1.35rem;
  letter-spacing: -0.03em;
}

.answer-primary strong small,
.answer-secondary strong small {
  font-size: 0.7rem;
  letter-spacing: 0;
}

.answer-primary b,
.answer-secondary b {
  color: var(--n-accent-strong);
  font-size: 0.68rem;
}

.answer-card p {
  border-top: 1px solid var(--n-line);
  color: var(--n-muted);
  font-size: 0.68rem;
  line-height: 1.4;
  margin: 0;
  padding-top: 0.55rem;
}

.ladder-heading {
  align-items: baseline;
  display: flex;
  gap: 0.6rem;
  justify-content: space-between;
}

.ladder-heading > span {
  color: var(--n-ink);
  font-size: 0.75rem;
  font-weight: 850;
}

.ladder-heading small {
  color: var(--n-muted);
  font-size: 0.63rem;
  text-align: right;
}

.gear-result-list {
  display: grid;
  gap: 0.35rem;
}

.gear-row {
  align-items: center;
  background: var(--n-surface-soft);
  border: 1px solid transparent;
  border-radius: 0.55rem;
  color: var(--n-muted);
  display: grid;
  font-size: 0.68rem;
  gap: 0.6rem;
  grid-template-columns: 4.3rem 1fr auto auto;
  padding: 0.55rem 0.65rem;
}

.gear-row-active {
  border-color: var(--n-accent);
  box-shadow: inset 3px 0 0 var(--n-accent);
}

.gear-number {
  color: var(--n-accent-strong);
  font-weight: 850;
}

.gear-speed,
.gear-rpm {
  text-align: right;
  white-space: nowrap;
}

.gear-row b {
  color: var(--n-ink);
}

.educational-notice {
  border-top: 1px solid var(--n-line);
  font-size: 0.72rem;
  padding-top: 0.75rem;
}

@keyframes wheel-turn {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes gear-turn {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes gear-turn-reverse {
  from { transform: rotate(360deg); }
  to { transform: rotate(0deg); }
}

@keyframes shaft-flow {
  from { stroke-dashoffset: 0; }
  to { stroke-dashoffset: -48; }
}

@media (max-width: 860px) {
  .gear-layout {
    grid-template-columns: 1fr;
  }

  .gear-controls,
  .gear-visual {
    padding: 0.8rem;
  }
}

@media (max-width: 520px) {
  .gear-tool {
    border-radius: 1rem;
    padding: 0.75rem;
  }

  .gear-layout,
  .gear-results {
    gap: 0.75rem;
  }

  .gear-results {
    padding-top: 0.85rem;
  }

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

  .gear-input-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .results-head {
    align-items: start;
    display: grid;
    gap: 0.4rem;
  }

  .status-badge {
    justify-self: start;
  }

  .results-head strong {
    font-size: 2.45rem;
  }

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

  .ladder-heading {
    align-items: start;
    flex-direction: column;
    gap: 0.2rem;
  }

  .ladder-heading small {
    text-align: left;
  }

  .gear-row {
    gap: 0.35rem;
    grid-template-columns: 3.7rem minmax(0, 1fr) auto;
  }

  .gear-rpm {
    grid-column: 3;
    grid-row: 1;
  }

  .motion-hint {
    display: grid;
    gap: 0.2rem;
  }
}