:root {
  --calc-ink: #17212f;
  --calc-muted: #627184;
  --calc-line: rgba(23, 33, 47, .12);
  --calc-paper: #fffdf7;
  --calc-teal: #126a72;
  --calc-amber: #d9822b;
  --calc-green: #2f7d57;
  --calc-red: #b44d3b;
}

.calculator-page {
  display: grid;
  gap: 1.6rem;
}

.calc-hero {
  background:
    radial-gradient(circle at top left, rgba(217, 130, 43, .22), transparent 32rem),
    radial-gradient(circle at bottom right, rgba(18, 106, 114, .18), transparent 30rem),
    linear-gradient(135deg, #fffaf0 0%, #eef7f5 100%);
}

.calc-trust-row,
.source-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: .85rem;
}

.calc-trust-row {
  margin-top: 1.1rem;
}

.calc-trust-card,
.source-card,
.calc-card {
  min-width: 0;
  border: 1px solid var(--calc-line);
  background: #fff;
  box-shadow: 0 14px 34px rgba(23, 33, 47, .08);
}

.calc-trust-card {
  border-radius: 18px;
  padding: .95rem;
  background: rgba(255, 255, 255, .72);
}

.calc-trust-card span,
.calc-main-result span,
.calc-metric span {
  display: block;
  color: var(--calc-muted);
  font-size: .82rem;
  font-weight: 800;
}

.calc-trust-card span,
.calc-main-result span {
  letter-spacing: .05em;
  text-transform: uppercase;
}

.calc-trust-card strong {
  display: block;
  margin-top: .25rem;
  color: var(--calc-ink);
  font-size: 1.12rem;
  line-height: 1.2;
}

.calculator-nav {
  position: sticky;
  top: .5rem;
  z-index: 5;
  display: flex;
  gap: .7rem;
  overflow-x: auto;
  padding: .75rem;
  border: 1px solid var(--calc-line);
  border-radius: 20px;
  background: rgba(255, 255, 255, .9);
  box-shadow: 0 12px 30px rgba(23, 33, 47, .08);
  backdrop-filter: blur(12px);
}

.calculator-nav a {
  flex: 0 0 auto;
  padding: .72rem .95rem;
  border-radius: 999px;
  background: #f3f7f7;
  color: var(--calc-ink);
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}

.calculator-nav a:hover {
  background: var(--calc-teal);
  color: #fff;
}

.calc-card {
  border-radius: 28px;
  overflow: hidden;
}

.calc-card__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: start;
  padding: 1.45rem;
  background: linear-gradient(135deg, rgba(18, 106, 114, .1), rgba(217, 130, 43, .11)), var(--calc-paper);
  border-bottom: 1px solid var(--calc-line);
}

.calc-card__head h2 {
  margin: .25rem 0 .45rem;
  color: var(--calc-ink);
}

.calc-card__head p,
.source-card p {
  margin: 0;
  color: var(--calc-muted);
  line-height: 1.6;
}

.calc-badge {
  display: inline-flex;
  padding: .45rem .7rem;
  border-radius: 999px;
  background: var(--calc-teal);
  color: #fff;
  font-weight: 900;
  font-size: .82rem;
  letter-spacing: .03em;
  text-transform: uppercase;
}

.calc-body {
  display: grid;
  grid-template-columns: minmax(280px, .92fr) minmax(280px, 1.08fr);
  gap: 1.2rem;
  padding: 1.45rem;
}

.calc-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .9rem;
  align-content: start;
}

.calc-field {
  display: grid;
  gap: .35rem;
}

.calc-field.is-wide,
.calc-check {
  grid-column: 1 / -1;
}

.calc-field label {
  color: #30455d;
  font-weight: 850;
}

.calc-field small {
  color: var(--calc-muted);
  line-height: 1.45;
}

.calc-field input,
.calc-field select {
  width: 100%;
  min-width: 0;
  border: 1px solid #d8e0e4;
  border-radius: 14px;
  padding: .82rem .9rem;
  background: #fbfcfc;
  color: var(--calc-ink);
  font: inherit;
}

.calc-field input:focus,
.calc-field select:focus {
  outline: 3px solid rgba(18, 106, 114, .16);
  border-color: var(--calc-teal);
  background: #fff;
}

.calc-check {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: .85rem .95rem;
  border-radius: 16px;
  background: #f5f9f7;
  color: #34536a;
  font-weight: 800;
}

.calc-check input {
  width: auto;
  accent-color: var(--calc-teal);
}

.calc-result {
  display: grid;
  gap: .9rem;
  align-content: start;
}

.calc-main-result {
  padding: 1.2rem;
  border-radius: 24px;
  background:
    radial-gradient(circle at 15% 15%, rgba(255, 255, 255, .22), transparent 12rem),
    linear-gradient(135deg, #143b43, #17212f);
  color: #fff;
  box-shadow: 0 18px 34px rgba(23, 33, 47, .2);
}

.calc-main-result span {
  color: rgba(255, 255, 255, .72);
}

.calc-main-result strong {
  display: block;
  margin-top: .25rem;
  font-size: clamp(1.65rem, 4vw, 2.55rem);
  line-height: 1.08;
}

.calc-main-result p {
  margin: .65rem 0 0;
  color: rgba(255, 255, 255, .82);
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.calc-metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .75rem;
}

.calc-metric {
  border: 1px solid var(--calc-line);
  border-radius: 18px;
  padding: .95rem;
  background: #fffdf8;
}

.calc-metric strong {
  display: block;
  margin-top: .2rem;
  color: var(--calc-ink);
  font-size: 1.13rem;
  overflow-wrap: anywhere;
}

.calc-note,
.calc-disclaimer {
  margin: 0;
  border-radius: 18px;
  line-height: 1.62;
}

.calc-note {
  border-left: 4px solid var(--calc-amber);
  padding: .9rem 1rem;
  background: #fff7ea;
  color: #634521;
}

.calc-note.is-green {
  border-left-color: var(--calc-green);
  background: #eff9f2;
  color: #244c34;
}

.calc-note.is-red {
  border-left-color: var(--calc-red);
  background: #fff2ef;
  color: #6a3329;
}

.calc-disclaimer {
  padding: 1rem 1.1rem;
  border: 1px solid rgba(180, 77, 59, .25);
  background: #fff5f2;
  color: #63372f;
}

.source-card {
  border-radius: 18px;
  padding: 1rem;
}

.source-card strong {
  display: block;
  color: var(--calc-ink);
  margin-bottom: .35rem;
}

.source-card p {
  margin-bottom: .55rem;
}

.source-card a {
  color: var(--calc-teal);
  font-weight: 850;
}

.calc-card__head,
.calc-body,
.calc-result,
.calc-metric,
.source-card {
  min-width: 0;
}

@media (max-width: 980px) {
  .calc-body {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  .calc-card__head,
  .calc-body {
    padding: 1.1rem;
  }

  .calc-card__head,
  .calc-form,
  .calc-metric-grid {
    grid-template-columns: 1fr;
  }

  .calculator-nav {
    border-radius: 16px;
  }

  .calc-field input,
  .calc-field select {
    font-size: 16px;
  }
}

@media (max-width: 480px) {
  .calculator-page {
    gap: 1rem;
  }

  .calculator-nav {
    position: static;
    gap: .5rem;
    padding: .55rem;
    border-radius: 14px;
  }

  .calculator-nav a {
    padding: .62rem .78rem;
    font-size: .92rem;
  }

  .calc-trust-row,
  .source-grid {
    grid-template-columns: 1fr;
  }

  .calc-card {
    border-radius: 20px;
  }

  .calc-main-result strong {
    font-size: 1.5rem;
  }

  .calc-note,
  .calc-disclaimer {
    border-radius: 14px;
    padding: .85rem .9rem;
  }
}