:root {
  --calculator-radius: 0.625rem;
  --calculator-shadow: 0 20px 52px rgba(28, 49, 82, 0.1);
}

.calculator-nav,
.mobile-calculator-nav {
  position: relative;
}

.calculator-nav summary,
.mobile-calculator-nav summary {
  min-height: 2.5rem;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  cursor: pointer;
  list-style: none;
  color: var(--ink-muted);
  font-size: 0.875rem;
  font-weight: 500;
}

.calculator-nav summary::-webkit-details-marker,
.mobile-calculator-nav summary::-webkit-details-marker {
  display: none;
}

.calculator-nav summary::after,
.mobile-calculator-nav summary::after {
  content: "";
  width: 0.42rem;
  height: 0.42rem;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-0.12rem);
  transition: transform 160ms ease;
}

.calculator-nav[open] summary,
.mobile-calculator-nav[open] summary {
  color: var(--accent);
}

.calculator-nav summary:hover,
.mobile-calculator-nav summary:hover {
  color: var(--accent);
}

.calculator-nav[open] summary::after,
.mobile-calculator-nav[open] summary::after {
  transform: rotate(225deg) translate(-0.08rem, -0.08rem);
}

.calculator-menu {
  position: absolute;
  top: calc(100% + 0.7rem);
  left: 50%;
  z-index: 12;
  width: min(30rem, calc(100vw - 2rem));
  padding: 0.45rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--calculator-radius);
  background: var(--surface);
  box-shadow: var(--calculator-shadow);
  transform: translateX(-50%);
}

.calculator-menu a {
  min-height: 3.35rem;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 0.35rem 1rem;
  padding: 0.65rem 0.75rem;
  border-radius: 0.4rem;
  color: var(--ink);
  text-decoration: none;
}

.calculator-menu a:hover,
.calculator-menu a[aria-current="page"] {
  background: var(--surface-accent);
  color: var(--accent);
}

.calculator-menu strong,
.calculator-menu span {
  grid-column: 1;
}

.calculator-menu strong {
  font-size: 0.88rem;
}

.calculator-menu span {
  color: var(--ink-muted);
  font-size: 0.72rem;
}

.mobile-calculator-nav {
  display: none;
  justify-self: end;
}

.calculator-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(16rem, 0.7fr);
  gap: clamp(2.5rem, 8vw, 7rem);
  align-items: end;
  padding-block: clamp(3.8rem, 7vw, 6.5rem) 3.6rem;
}

.calculator-hero-copy h1 {
  max-width: 13ch;
  font-size: clamp(2.65rem, 5.5vw, 4.35rem);
}

.calculator-hero-copy > p:not(.context-label) {
  max-width: 38rem;
  margin: 1.25rem 0 0;
  color: var(--ink-muted);
  font-size: 1.06rem;
  line-height: 1.65;
  text-wrap: pretty;
}

.calculator-summary {
  padding: 1rem 0 0 1.2rem;
  border-left: 3px solid var(--accent);
}

.calculator-summary strong,
.calculator-summary span {
  display: block;
}

.calculator-summary strong {
  font-size: 0.9rem;
}

.calculator-summary span {
  margin-top: 0.45rem;
  color: var(--ink-muted);
  font-size: 0.82rem;
  line-height: 1.55;
}

.calculator-workspace {
  padding-bottom: 5.5rem;
}

.calculator-frame {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(17rem, 0.65fr);
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--calculator-radius);
  background: var(--surface);
  box-shadow: var(--calculator-shadow);
}

.calculator-form {
  min-width: 0;
  padding: clamp(1.15rem, 2.5vw, 2rem);
}

.calculator-form-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 1.5rem;
  padding-bottom: 1.3rem;
  border-bottom: 1px solid var(--line);
}

.calculator-form-header h2,
.calculator-form-header p {
  margin: 0;
}

.calculator-form-header h2 {
  font-size: clamp(1.35rem, 2.4vw, 1.85rem);
  letter-spacing: -0.025em;
}

.calculator-form-header p {
  max-width: 34rem;
  margin-top: 0.35rem;
  color: var(--ink-muted);
  font-size: 0.82rem;
}

.reset-calculator {
  flex: 0 0 auto;
  min-height: 2.5rem;
  padding: 0 0.2rem;
  border: 0;
  background: transparent;
  color: var(--ink-muted);
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 0.28em;
}

.reset-calculator:hover {
  color: var(--accent);
}

.reset-calculator:disabled {
  color: var(--line-strong);
  cursor: not-allowed;
  text-decoration: none;
}

.fixed-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.25rem;
  padding: 1rem;
  border-radius: 0.5rem;
  background: var(--surface-muted);
}

.fixed-fields.three-columns {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.field {
  min-width: 0;
}

.field label,
.row-field label {
  display: block;
  margin-bottom: 0.38rem;
  color: var(--ink-muted);
  font-size: 0.72rem;
  font-weight: 600;
}

.field input,
.field select,
.row-field input,
.row-field select {
  width: 100%;
  min-height: 2.85rem;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--line-strong);
  border-radius: 0.4rem;
  background: var(--surface);
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.field input:hover,
.field select:hover,
.row-field input:hover,
.row-field select:hover {
  border-color: var(--accent);
}

.field input[aria-invalid="true"],
.row-field input[aria-invalid="true"],
.row-field select[aria-invalid="true"] {
  border-color: var(--danger);
  box-shadow: 0 0 0 1px var(--danger);
}

.field-help {
  margin: 0.4rem 0 0;
  color: var(--ink-muted);
  font-size: 0.7rem;
}

.rows-head,
.calculator-row {
  display: grid;
  grid-template-columns: minmax(10rem, 1.4fr) minmax(6rem, 0.72fr) minmax(6.5rem, 0.75fr) 2.6rem;
  gap: 0.7rem;
  align-items: end;
}

.rows-head {
  margin-top: 1.45rem;
  padding: 0 0.2rem 0.45rem;
  color: var(--ink-muted);
  font-size: 0.68rem;
  font-weight: 600;
}

.rows-head.five,
.calculator-row.five {
  grid-template-columns: minmax(9rem, 1.25fr) minmax(5.5rem, 0.62fr) minmax(6.5rem, 0.75fr) minmax(5rem, 0.55fr) 2.6rem;
}

.rows-head.three,
.calculator-row.three {
  grid-template-columns: minmax(11rem, 1fr) minmax(7rem, 0.6fr) 2.6rem;
}

.calculator-row {
  padding: 0.55rem 0;
}

.row-field label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.remove-row {
  width: 2.6rem;
  min-height: 2.85rem;
  border: 0;
  border-radius: 0.4rem;
  background: transparent;
  color: var(--ink-muted);
  cursor: pointer;
  font-size: 1.35rem;
}

.remove-row:hover {
  background: var(--surface-muted);
  color: var(--danger);
}

.form-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.add-row {
  min-height: 2.65rem;
  padding: 0 0.85rem;
  border: 1px solid var(--accent);
  border-radius: 0.4rem;
  background: transparent;
  color: var(--accent);
  cursor: pointer;
  font-weight: 600;
}

.add-row::before {
  content: "+";
  margin-right: 0.45rem;
}

.add-row:hover {
  background: var(--surface-accent);
}

.form-footer p {
  max-width: 31rem;
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.7rem;
  text-align: right;
}

.calculator-result {
  min-width: 0;
  padding: clamp(1.4rem, 3vw, 2rem);
  border-left: 1px solid var(--line);
  background: var(--surface-accent);
}

.result-kicker {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.78rem;
  font-weight: 600;
}

.result-number {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  margin-top: 0.7rem;
}

.result-number strong {
  color: var(--accent);
  font-family: var(--mono);
  font-size: clamp(3.35rem, 6vw, 5rem);
  font-weight: 500;
  letter-spacing: -0.08em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.result-number span {
  color: var(--ink-muted);
  font-size: 0.72rem;
}

.result-breakdown {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 1.35rem 0 0;
  padding-top: 1.15rem;
  border-top: 1px solid var(--line-strong);
}

.result-breakdown div {
  min-width: 0;
}

.result-breakdown dt {
  color: var(--ink-muted);
  font-size: 0.68rem;
}

.result-breakdown dd {
  margin: 0.35rem 0 0;
  font-family: var(--mono);
  font-size: 1.1rem;
  font-variant-numeric: tabular-nums;
}

.calculation-box,
.result-message {
  margin-top: 1.3rem;
  padding: 1rem;
  border: 1px solid var(--line-strong);
  border-radius: 0.5rem;
  background: color-mix(in srgb, var(--surface) 74%, transparent);
}

.calculation-box strong,
.calculation-box span {
  display: block;
}

.calculation-box strong {
  font-size: 0.72rem;
}

.calculation-box span {
  margin-top: 0.45rem;
  color: var(--ink-muted);
  font-family: var(--mono);
  font-size: 0.74rem;
  line-height: 1.55;
  font-variant-numeric: tabular-nums;
}

.result-message {
  color: var(--ink-muted);
  font-size: 0.76rem;
  line-height: 1.55;
}

.result-error {
  min-height: 1.4rem;
  margin: 1rem 0 0;
  color: var(--danger);
  font-size: 0.75rem;
  font-weight: 600;
}

.calculator-explainer {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(16rem, 0.7fr);
  gap: clamp(3rem, 9vw, 8rem);
  padding-block: 5.5rem 6.5rem;
  border-top: 1px solid var(--line-strong);
}

.calculator-explainer h2,
.calculator-related h2 {
  margin: 0;
  font-size: clamp(1.8rem, 3.5vw, 2.65rem);
  letter-spacing: -0.035em;
}

.calculator-explainer p {
  max-width: 64ch;
  color: var(--ink-muted);
  line-height: 1.75;
  text-wrap: pretty;
}

.formula-note {
  align-self: start;
  padding: 1.25rem;
  border-radius: 0.5rem;
  background: var(--surface-muted);
}

.formula-note strong,
.formula-note code {
  display: block;
}

.formula-note strong {
  font-size: 0.8rem;
}

.formula-note code {
  margin-top: 0.75rem;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.6;
  white-space: normal;
}

.calculator-related {
  padding-block: 0 6rem;
}

.related-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 2rem;
  margin-top: 1.6rem;
  border-top: 1px solid var(--line-strong);
}

.related-list a {
  min-height: 5.25rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
}

.related-list a:hover strong {
  color: var(--accent);
}

.related-list span {
  margin-top: 0.3rem;
  color: var(--ink-muted);
  font-size: 0.76rem;
}

@media (max-width: 56rem) {
  .header-inner.has-calculator-nav {
    grid-template-columns: 1fr auto;
  }

  .header-inner.has-calculator-nav .header-action {
    display: none;
  }

  .mobile-calculator-nav {
    display: block;
  }

  .mobile-calculator-nav summary {
    padding: 0 0.8rem;
    border: 1px solid var(--line-strong);
    border-radius: 0.4rem;
    background: var(--surface);
    color: var(--ink);
    font-weight: 600;
  }

  .mobile-calculator-nav .calculator-menu {
    right: 0;
    left: auto;
    transform: none;
  }

  .calculator-hero,
  .calculator-frame,
  .calculator-explainer {
    grid-template-columns: 1fr;
  }

  .calculator-result {
    min-height: 24rem;
    border-top: 1px solid var(--line);
    border-left: 0;
  }
}

@media (max-width: 42.5rem) {
  .mobile-calculator-nav summary {
    min-height: 2.75rem;
    padding-inline: 0.65rem;
    font-size: 0.78rem;
  }

  .calculator-menu {
    width: min(22rem, calc(100vw - 1.5rem));
  }

  .calculator-menu a {
    min-height: 3.2rem;
  }

  .calculator-hero {
    gap: 2.2rem;
    padding-block: 3.4rem 3rem;
  }

  .calculator-hero-copy h1 {
    font-size: clamp(2.45rem, 12vw, 3.3rem);
  }

  .calculator-workspace {
    padding-bottom: 4rem;
  }

  .calculator-form {
    padding: 1rem 0.8rem 1.3rem;
  }

  .calculator-form-header {
    align-items: flex-start;
  }

  .fixed-fields,
  .fixed-fields.three-columns {
    grid-template-columns: 1fr;
  }

  .rows-head {
    display: none;
  }

  .calculator-row,
  .calculator-row.five,
  .calculator-row.three {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 0.6rem;
    padding: 0.9rem 0 1rem;
    border-bottom: 1px solid var(--line);
  }

  .calculator-row .row-field {
    grid-column: span 3;
  }

  .calculator-row .row-field:first-child {
    grid-column: 1 / 6;
  }

  .calculator-row.five .row-field:nth-child(2),
  .calculator-row.five .row-field:nth-child(3),
  .calculator-row.five .row-field:nth-child(4) {
    grid-column: span 2;
  }

  .calculator-row.three .row-field:nth-child(2) {
    grid-column: 1 / 6;
  }

  .calculator-row .remove-row {
    grid-column: 6;
    grid-row: 1;
  }

  .row-field label {
    position: static;
    width: auto;
    height: auto;
    overflow: visible;
    clip: auto;
    white-space: normal;
  }

  .form-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .form-footer p {
    text-align: left;
  }

  .calculator-result {
    padding: 1.35rem 1.15rem;
  }

  .calculator-explainer {
    gap: 2rem;
    padding-block: 4.5rem 5rem;
  }

  .related-list {
    grid-template-columns: 1fr;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --calculator-shadow: 0 20px 52px rgba(0, 0, 0, 0.28);
  }
}

@media (prefers-reduced-motion: reduce) {
  .calculator-nav summary::after,
  .mobile-calculator-nav summary::after {
    transition: none;
  }
}