.calculator-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(280px, 0.82fr);
  gap: 22px;
  align-items: start;
  margin-top: 18px;
}

.calculator-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: 0 7px 18px rgba(23, 36, 43, 0.05);
  padding: 22px;
}

.calculator-form {
  display: grid;
  gap: 10px;
}

.field-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(84px, 112px);
  gap: 8px;
  align-items: end;
}

.input-field {
  display: grid;
  gap: 6px;
}

.calculator-form > .input-field {
  grid-template-columns: minmax(185px, 1fr) minmax(92px, 136px) auto;
  align-items: center;
  column-gap: 10px;
}

.field-grid .input-field:first-child {
  grid-template-columns: minmax(185px, 1fr) minmax(92px, 136px);
  align-items: center;
  column-gap: 10px;
}

.field-grid .input-field:last-child label {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.input-field label,
.result-label {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.input-field input,
.input-field select {
  width: 100%;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  font: inherit;
  padding: 7px 10px;
}

.input-field input {
  text-align: right;
}

.input-field input:focus,
.input-field select:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(31, 111, 139, 0.14);
  outline: 0;
}

.unit-suffix {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.range-note {
  display: none;
}

.result-stack {
  display: grid;
  gap: 10px;
}

.result-box {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(180deg, #f8fbfc, #fff);
  padding: 14px;
}

.result-value {
  margin-top: 4px;
  color: var(--blue-dark);
  font-size: clamp(24px, 2.6vw, 34px);
  font-weight: 700;
  line-height: 1.12;
  overflow-wrap: anywhere;
}

.result-subvalue {
  margin-top: 4px;
  color: var(--muted);
  font-size: 15px;
}

.formula-list {
  display: grid;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.formula-list li {
  border-left: 4px solid var(--blue-soft);
  padding-left: 12px;
  color: #263841;
}

.calculator-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

.button {
  min-height: 38px;
  border: 1px solid var(--blue);
  border-radius: 6px;
  background: var(--blue);
  color: #fff;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  padding: 7px 13px;
}

.button.secondary {
  background: #fff;
  color: var(--blue-dark);
}

.validation-message {
  min-height: 18px;
  margin: 0;
  color: #8a4d00;
  font-size: 14px;
}

.calculator-meta {
  margin-top: 18px;
}

.calculator-meta h2 {
  margin-top: 0;
}

.calculator-meta ul {
  margin-bottom: 0;
}

.related-grid {
  margin-top: 22px;
}

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

@media (max-width: 560px) {
  .field-grid,
  .calculator-form > .input-field,
  .field-grid .input-field:first-child {
    grid-template-columns: 1fr;
  }

  .field-grid .input-field:last-child label {
    position: static;
    width: auto;
    height: auto;
    margin: 0;
    overflow: visible;
    clip: auto;
  }

  .calculator-panel {
    padding: 18px;
  }
}

/* bookforge-ads:start */
.ad-slot {
  margin: 28px auto;
  padding: 0;
  width: min(100%, 728px);
  min-height: 90px;
}
.ad-slot ins {
  display: block;
}
@media (max-width: 760px) {
  .ad-slot {
    width: min(100%, 336px);
    min-height: 280px;
  }
}

.acronym-term,
.reference-term {
  position: relative;
  border-bottom: 1px dotted currentColor;
  cursor: help;
  text-decoration: none;
}
.acronym-term:focus,
.reference-term:focus {
  outline: 2px solid rgba(31, 111, 139, 0.28);
  outline-offset: 2px;
}
.acronym-term::after,
.reference-term::after {
  position: absolute;
  left: 50%;
  bottom: 1.55em;
  transform: translateX(-50%);
  z-index: 40;
  width: min(360px, 78vw);
  padding: 0.75rem 0.85rem;
  border: 1px solid #d7e3e8;
  border-radius: 8px;
  background: #ffffff;
  color: #17242b;
  box-shadow: 0 14px 32px rgba(23, 36, 43, 0.18);
  font-size: 0.86rem;
  font-weight: 400;
  line-height: 1.38;
  text-align: left;
  white-space: normal;
  opacity: 0;
  pointer-events: none;
}
.acronym-term::after {
  content: attr(data-definition);
}
.reference-term::after {
  content: attr(data-reference-preview);
}
.acronym-term:hover::after,
.acronym-term:focus::after,
.reference-term:hover::after,
.reference-term:focus::after {
  opacity: 1;
}

/* bookforge-ads:end */

.antenna-stack {
  display: grid;
  gap: 22px;
}

.antenna-tool h2 {
  margin-top: 0;
}

.antenna-tool-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.9fr);
  gap: 22px;
  align-items: start;
}

.antenna-tool .result-stack {
  align-self: start;
}

.antenna-tool .result-value {
  font-size: clamp(21px, 2.2vw, 30px);
}

@media (max-width: 900px) {
  .antenna-tool-grid {
    grid-template-columns: 1fr;
  }
}
.calculator-stack {
  display: grid;
  gap: 22px;
}

.multi-calculator-tool h2 {
  margin-top: 0;
}

.multi-calculator-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.9fr);
  gap: 22px;
  align-items: start;
}

.multi-calculator-tool .result-stack {
  align-self: start;
}

.multi-calculator-tool .result-value {
  font-size: clamp(21px, 2.2vw, 30px);
}

@media (max-width: 900px) {
  .multi-calculator-grid {
    grid-template-columns: 1fr;
  }
}
.nearfar-wavelength-output {
  margin: 18px 0 0;
}

.nearfar-wavelength-note {
  margin-top: 0;
}
.calculator-range {
  width: 100%;
  accent-color: var(--blue);
}

.motion-control {
  margin: 0;
  border: 0;
  padding: 0;
}

.motion-control legend {
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.segmented-control {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.segmented-control label {
  position: relative;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 10px;
  background: #fff;
  color: var(--ink);
  text-align: center;
  cursor: pointer;
  font-weight: 700;
}

.segmented-control input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.segmented-control label:has(input:checked) {
  border-color: var(--blue);
  background: var(--blue-soft);
  color: var(--blue-dark);
}