.nav-back {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding-inline: 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-weight: 600;
}

nav .nav-back:hover {
  background: var(--tint);
  text-decoration: none;
}

.tool-intro {
  padding-block: clamp(46px, 6vw, 78px);
  border-bottom: 1px solid var(--line);
}

.tool-intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, .65fr);
  gap: clamp(38px, 7vw, 100px);
  align-items: end;
}

.tool-intro .eyebrow {
  margin-bottom: 20px;
}

.tool-intro h1 {
  max-width: 820px;
  font-size: clamp(2.7rem, 5vw, 4.7rem);
  font-weight: 700;
  letter-spacing: -.055em;
}

.tool-lead {
  padding-left: 22px;
  color: var(--muted);
  border-left: 2px solid #779c6e;
  font-size: 1.08rem;
}

.tool-lead strong {
  color: var(--ink);
  font-weight: 600;
}

.calculator-area {
  padding-block: clamp(60px, 7vw, 100px);
  background: var(--tint);
}

.calculator-layout {
  display: grid;
  grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
  gap: clamp(26px, 4.5vw, 64px);
  align-items: stretch;
}

.calculator-card,
.results-card {
  min-width: 0;
  overflow: hidden;
  border-radius: 16px;
}

.calculator-card {
  padding: clamp(26px, 3vw, 40px);
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 3px solid var(--ink);
}

.calculator-card-heading {
  margin-bottom: 30px;
}

.calculator-card-heading .eyebrow {
  margin-bottom: 15px;
}

.calculator-card-heading h2 {
  font-size: clamp(1.8rem, 2.6vw, 2.45rem);
}

.calculator-card-heading > p:last-child {
  margin-top: 14px;
  color: var(--muted);
  font-size: .88rem;
}

.calculator-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px 18px;
}

.calculator-field {
  min-width: 0;
}

.calculator-field.full {
  grid-column: 1 / -1;
}

.calculator-field label {
  display: block;
  margin-bottom: 8px;
  font-size: .8rem;
  font-weight: 600;
  line-height: 1.4;
}

.calculator-field input,
.calculator-field select {
  width: 100%;
  min-width: 0;
  min-height: 52px;
  padding: 11px 12px;
  color: var(--ink);
  background: #fff;
  border: 1px solid #9fac9a;
  border-radius: 5px;
  font: inherit;
  font-size: .93rem;
}

.calculator-field input::placeholder {
  color: #718078;
  opacity: 1;
}

.calculator-field input:focus,
.calculator-field select:focus {
  border-color: #557f48;
}

.field-help {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: .68rem;
  line-height: 1.45;
}

.input-affix {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  min-height: 52px;
  background: #fff;
  border: 1px solid #9fac9a;
  border-radius: 5px;
}

.input-affix:focus-within {
  border-color: #557f48;
  outline: 3px solid #557f48;
  outline-offset: 5px;
}

.input-affix > span {
  padding-left: 12px;
  color: var(--muted);
  font-size: .85rem;
}

.input-affix input {
  border: 0;
  outline: 0;
}

.input-affix input:focus {
  outline: 0;
}

.input-affix-suffix {
  grid-template-columns: minmax(0, 1fr) auto;
}

.input-affix-suffix > span {
  padding: 0 12px 0 0;
}

.calculator-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  margin-top: 30px;
}

.calculator-actions .button {
  flex: 1 1 235px;
  cursor: pointer;
}

.reset-button {
  min-height: 44px;
  padding: 8px 2px;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--muted);
  font: inherit;
  font-size: .8rem;
}

.reset-button:hover {
  color: var(--ink);
  border-color: var(--ink);
}

.calculator-message {
  margin-top: 18px;
  padding: 13px 15px;
  color: #7f3027;
  background: #fff2eb;
  border: 1px solid #bd8076;
  border-radius: 5px;
  font-size: .8rem;
}

.results-card {
  display: grid;
  grid-template-rows: auto 1fr auto;
  position: static;
  color: #f4f6ee;
  background: var(--dark);
  box-shadow: 0 24px 55px -42px rgba(5, 45, 32, .85);
}

.results-heading {
  padding: clamp(28px, 3.4vw, 42px);
  border-bottom: 1px solid #496859;
}

.results-heading .eyebrow {
  margin-bottom: 16px;
  color: #b4d1a8;
}

.results-heading h2 {
  max-width: 580px;
  color: #fff;
  font-size: clamp(2rem, 3.4vw, 3.1rem);
}

.results-heading > p:last-child {
  min-height: 1.55em;
  margin-top: 18px;
  color: #c7d5cc;
  font-size: .85rem;
}

.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.result-item {
  min-width: 0;
  padding: clamp(25px, 3vw, 36px);
  border-bottom: 1px solid #496859;
}

.result-item:nth-child(odd) {
  border-right: 1px solid #496859;
}

.result-item strong {
  display: block;
  white-space: nowrap;
  overflow-wrap: normal;
  word-break: normal;
  color: #d8efc8;
  font-size: clamp(2rem, 3.4vw, 3.4rem);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -.055em;
  line-height: 1.05;
}

.result-item span {
  display: block;
  margin-top: 9px;
  color: #d2dcd5;
  font-size: .8rem;
}

.results-action {
  padding: 24px clamp(28px, 3.4vw, 42px) 30px;
}

.results-action p {
  color: #b8cabd;
  font-size: .7rem;
  line-height: 1.55;
}

.results-action a {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 17px;
  min-height: 48px;
  padding: 11px 19px;
  color: var(--ink);
  background: var(--accent);
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: .82rem;
  font-weight: 600;
  line-height: 1.35;
  transition: background .2s, transform .2s;
}

.results-action a:hover {
  background: #98be91;
  transform: translateY(-1px);
}

.calculation-note {
  max-width: 1040px;
  margin-top: 24px;
  padding-top: 17px;
  color: var(--muted);
  border-top: 1px solid #bac7b6;
  font-size: .72rem;
  line-height: 1.6;
}

.calculation-note strong {
  color: var(--ink);
  font-weight: 600;
}

@media (max-width: 1000px) {
  .calculator-layout {
    grid-template-columns: 1fr;
  }

  .results-card {
    position: static;
  }
}

@media (max-width: 850px) {
  .tool-intro-grid {
    grid-template-columns: 1fr;
  }

  .tool-intro-grid {
    gap: 28px;
  }

  .tool-lead {
    max-width: 650px;
  }
}

@media (max-width: 560px) {
  .tool-intro {
    padding-block: 36px 44px;
  }

  .tool-intro h1 {
    font-size: 2.5rem;
  }

  .tool-lead {
    padding-left: 17px;
    font-size: 1rem;
  }

  .calculator-area {
    padding-block: 44px 58px;
  }

  .calculator-card {
    padding: 24px 20px;
  }

  .calculator-fields,
  .result-grid {
    grid-template-columns: 1fr;
  }

  .result-item:nth-child(odd) {
    border-right: 0;
  }

  .result-item strong {
    font-size: 2.45rem;
  }

  .results-action a {
    width: 100%;
  }
}

@media print {
  .calculator-area {
    background: white !important;
  }

  .results-card {
    position: static;
    color: black;
    background: white !important;
    border: 1px solid #aaa;
    box-shadow: none;
  }

  .results-heading h2,
  .results-heading > p:last-child,
  .result-item strong,
  .result-item span,
  .results-action p {
    color: black !important;
  }
}