:root {
  --n-ink: #182333;
  --n-muted: #657084;
  --n-paper: #f7f4ee;
  --n-card: #fffdf8;
  --n-line: #d9d5cc;
  --n-blue: #1553c7;
  --n-blue-soft: #dce8ff;
  --n-orange: #e76b35;
  --n-orange-soft: #ffe5d6;
  --n-green: #18765d;
  --n-green-soft: #dff2e9;
  --n-red: #b84b43;
  --n-red-soft: #f8dfdb;
  --n-shadow: rgba(24, 35, 51, 0.12);
  --n-stage: #eaf1f3;
  --n-grid: rgba(24, 35, 51, 0.1);
  --n-white: #fff;
}

.theme-dark .drone-motor-tool {
  --n-ink: #edf2fb;
  --n-muted: #a4b0c3;
  --n-paper: #111824;
  --n-card: #192333;
  --n-line: #354156;
  --n-blue: #80a9ff;
  --n-blue-soft: #21385f;
  --n-orange: #ff9d69;
  --n-orange-soft: #513022;
  --n-green: #62caa4;
  --n-green-soft: #173b32;
  --n-red: #ff8f83;
  --n-red-soft: #4b2728;
  --n-shadow: rgba(0, 0, 0, 0.3);
  --n-stage: #1c2a36;
  --n-grid: rgba(255, 255, 255, 0.11);
  --n-white: #fff;
}

.drone-motor-tool {
  display: grid;
  gap: 0;
  overflow: hidden;
  border: 1px solid var(--n-line);
  border-radius: 1.25rem;
  background: var(--n-card);
  box-shadow: 0 18px 45px var(--n-shadow);
  color: var(--n-ink);
  padding: clamp(1rem, 3vw, 2rem);
}

.tool-controls {
  display: grid;
  gap: 0;
  grid-template-columns: 1fr;
}

.setup-card,
.results-card {
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.setup-card {
  padding: 0;
}

.presets-card,
.specs-card,
.bench-card {
  grid-column: 1 / -1;
  border-bottom: 1px solid var(--n-line);
  padding: 0 0 1.25rem;
}

.unit-card {
  align-self: stretch;
  min-width: 0;
  border-bottom: 1px solid var(--n-line);
  padding: 1.25rem 0;
}

.eyebrow {
  color: var(--n-orange);
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .15em;
  text-transform: uppercase;
}

.preset-row,
.unit-toggle,
.choice-row {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

.preset-row {
  margin-top: .75rem;
}

button {
  cursor: pointer;
  font: inherit;
}

.preset-button,
.unit-button,
.choice-row button {
  border: 1px solid var(--n-line);
  border-radius: 999px;
  background: var(--n-paper);
  color: var(--n-muted);
  font-size: .8rem;
  font-weight: 700;
  padding: .6rem .85rem;
  transition: border-color .2s ease, background .2s ease, color .2s ease, transform .2s ease;
}

.preset-button:hover,
.unit-button:hover,
.choice-row button:hover {
  border-color: var(--n-blue);
  color: var(--n-blue);
  transform: translateY(-1px);
}

.preset-button.is-selected,
.unit-button.is-selected,
.choice-row button.is-selected {
  border-color: var(--n-blue);
  background: var(--n-blue);
  color: var(--n-white);
}

.unit-toggle {
  margin-top: .75rem;
}

.section-heading,
.results-topline {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.section-heading {
  display: grid;
  justify-content: start;
}

h2 {
  margin: .25rem 0 0;
  color: var(--n-ink);
  font-size: clamp(1.25rem, 2vw, 1.65rem);
  line-height: 1.1;
}

h2 span {
  color: var(--n-muted);
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .05em;
  text-transform: uppercase;
}

.input-grid {
  display: grid;
  gap: .85rem;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 1rem;
}

.field,
.choice-field {
  display: grid;
  align-content: start;
  gap: .4rem;
  min-width: 0;
}

.field > span,
.choice-field > span {
  color: var(--n-muted);
  font-size: .75rem;
  font-weight: 700;
}

.field {
  position: relative;
}

.field input {
  width: 100%;
  box-sizing: border-box;
  border: 1px solid var(--n-line);
  border-radius: .75rem;
  background: var(--n-paper);
  color: var(--n-ink);
  font-size: 1.05rem;
  font-weight: 800;
  padding: .8rem 2.3rem .8rem .8rem;
}

.field input:focus-visible,
button:focus-visible {
  outline: 3px solid var(--n-orange);
  outline-offset: 2px;
}

.field small {
  position: absolute;
  right: .75rem;
  bottom: .83rem;
  color: var(--n-muted);
  font-size: .7rem;
  font-weight: 800;
}

.choice-row button {
  flex: 1;
  padding: .7rem .45rem;
  white-space: nowrap;
}

.field-wide {
  grid-column: span 2;
}

.fine-print,
.notes-row p {
  color: var(--n-muted);
  font-size: .76rem;
  line-height: 1.5;
}

.fine-print {
  margin: 1rem 0 0;
}

.bench-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.clear-button {
  flex: 0 0 auto;
  border: 0;
  background: transparent;
  color: var(--n-blue);
  font-size: .75rem;
  font-weight: 800;
  padding: .5rem 0;
  text-decoration: underline;
  text-underline-offset: .2rem;
}

.clear-button:hover {
  color: var(--n-orange);
}

.fine-print span {
  color: var(--n-blue);
  font-weight: 800;
}

.results-card {
  overflow: hidden;
  padding: 1.5rem 0 0;
}

.status-pill {
  border: 1px solid var(--n-green);
  border-radius: 999px;
  background: var(--n-green-soft);
  color: var(--n-green);
  font-size: .75rem;
  font-weight: 800;
  padding: .55rem .75rem;
  text-align: center;
}

[data-status="underpowered"] .status-pill {
  border-color: var(--n-red);
  background: var(--n-red-soft);
  color: var(--n-red);
}

[data-status="workable"] .status-pill {
  border-color: var(--n-orange);
  background: var(--n-orange-soft);
  color: var(--n-orange);
}

.wind-tunnel {
  position: relative;
  min-height: 18rem;
  margin: 1.5rem 0 1rem;
  overflow: hidden;
  border: 1px solid var(--n-line);
  border-radius: 1rem;
  background-color: var(--n-stage);
  background-image: linear-gradient(var(--n-grid) 1px, transparent 1px), linear-gradient(90deg, var(--n-grid) 1px, transparent 1px);
  background-size: 2rem 2rem;
}

.tunnel-label {
  position: absolute;
  z-index: 2;
  color: var(--n-muted);
  font-size: .65rem;
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.tunnel-label-top {
  top: 1rem;
  left: 1rem;
}

.rotor-stage {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 3;
  width: 10rem;
  height: 10rem;
  transform: translate(-50%, -50%);
}

.rotor-shadow {
  position: absolute;
  inset: 1rem;
  border-radius: 50%;
  background: var(--n-blue-soft);
  opacity: .7;
}

.rotor-disc {
  position: absolute;
  inset: 1.6rem;
  border: 2px solid var(--n-blue);
  border-radius: 50%;
  background: var(--n-card);
  box-shadow: 0 0 0 .7rem var(--n-blue-soft), 0 14px 28px var(--n-shadow);
  animation: rotor-spin var(--rotor-speed, 150ms) linear infinite;
}

.rotor-blade {
  position: absolute;
  top: 50%;
  left: 50%;
  width: .65rem;
  height: 3.7rem;
  border-radius: 999px 999px .35rem .35rem;
  background: var(--n-orange);
  transform: translate(-50%, -100%);
  transform-origin: 50% 100%;
}

.blade-two { transform: translate(-50%, -100%) rotate(90deg); }
.blade-three { transform: translate(-50%, -100%) rotate(180deg); }
.blade-four { transform: translate(-50%, -100%) rotate(270deg); }

.rotor-hub {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 1.3rem;
  height: 1.3rem;
  border: .25rem solid var(--n-blue);
  border-radius: 50%;
  background: var(--n-orange-soft);
  transform: translate(-50%, -50%);
}

.rotor-readout {
  position: absolute;
  right: 50%;
  bottom: -3.3rem;
  display: grid;
  gap: .15rem;
  width: 12rem;
  color: var(--n-ink);
  text-align: center;
  transform: translateX(50%);
}

.rotor-readout strong {
  font-size: 1rem;
}

.rotor-readout span {
  color: var(--n-muted);
  font-size: .7rem;
}

.thrust-stream {
  position: absolute;
  top: 50%;
  width: 35%;
  height: 1px;
  background: var(--n-orange);
  opacity: .7;
}

.stream-left {
  left: 3%;
  transform: translateY(-50%) rotate(-8deg);
}

.stream-right {
  right: 3%;
  transform: translateY(-50%) rotate(8deg);
}

.thrust-stream::after {
  position: absolute;
  top: -.2rem;
  width: .4rem;
  height: .4rem;
  border-top: 1px solid var(--n-orange);
  border-right: 1px solid var(--n-orange);
  content: '';
}

.stream-left::after {
  right: 0;
  transform: rotate(45deg);
}

.stream-right::after {
  left: 0;
  transform: rotate(-135deg);
}

.weight-marker {
  position: absolute;
  right: 1rem;
  bottom: 1rem;
  display: flex;
  align-items: center;
  gap: .4rem;
  color: var(--n-muted);
  font-size: .65rem;
  font-weight: 800;
  text-transform: uppercase;
}

.marker-line {
  display: block;
  width: 2.8rem;
  border-top: 2px dashed var(--n-red);
}

.lift-beam {
  position: absolute;
  top: 1.5rem;
  left: 50%;
  width: 2px;
  height: 30%;
  background: var(--n-blue);
  transform: translateX(-50%);
}

.lift-beam span {
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 12rem;
  height: .3rem;
  border-radius: 999px;
  background: var(--n-orange);
  transform: translateX(-50%) scaleX(var(--lift-ratio, .8));
  transform-origin: center;
}

.status-advice {
  margin: 0 0 1rem;
  color: var(--n-muted);
  font-size: .85rem;
  line-height: 1.5;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  border-top: 1px solid var(--n-line);
  border-left: 1px solid var(--n-line);
}

.result-cell {
  display: grid;
  gap: .4rem;
  min-height: 5.5rem;
  align-content: center;
  border-right: 1px solid var(--n-line);
  border-bottom: 1px solid var(--n-line);
  padding: .75rem;
}

.result-cell span {
  color: var(--n-muted);
  font-size: .67rem;
  font-weight: 700;
  line-height: 1.25;
}

.result-cell strong {
  color: var(--n-ink);
  font-size: 1rem;
}

.result-cell.accent {
  background: var(--n-blue-soft);
}

.result-cell.accent strong {
  color: var(--n-blue);
  font-size: 1.1rem;
}

.notes-row {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr 1fr;
  margin-top: 1rem;
}

.notes-row p { margin: 0; }

@keyframes rotor-spin {
  to { transform: rotate(360deg); }
}

@media (max-width: 850px) {
  .input-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .field-wide { grid-column: span 1; }
  .result-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (max-width: 540px) {
  .drone-motor-tool { border-radius: .9rem; }
  .input-grid,
  .notes-row { grid-template-columns: 1fr; }
  .bench-foot {
    align-items: flex-start;
    flex-direction: column;
    gap: .25rem;
  }
  .choice-row button { font-size: .7rem; }
  .wind-tunnel { min-height: 16rem; }
  .rotor-stage { transform: translate(-50%, -50%) scale(.82); }
  .result-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}