:root {
  --ink: #172838;
  --muted: #5c6872;
  --line: #d9e0e5;
  --soft: #f3f6f8;
  --paper: #ffffff;
  --accent: #b35c26;
  --accent-dark: #8e421a;
  --accent-soft: #fff3ea;
  --blue-soft: #eaf2f7;
  --error: #a12d2d;
  --error-soft: #fff0f0;
  --shadow: 0 20px 55px rgba(23, 40, 56, 0.09);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--soft);
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  background:
    linear-gradient(180deg, #ffffff 0, #ffffff 24rem, var(--soft) 24rem),
    var(--soft);
  font-size: 1rem;
  line-height: 1.55;
}

button,
input {
  font: inherit;
}

a {
  color: var(--accent-dark);
  text-underline-offset: 0.16em;
}

a:hover {
  text-decoration-thickness: 2px;
}

.site-header,
main,
footer {
  width: min(1180px, calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  color: var(--ink);
  text-decoration: none;
}

.brand-logo {
  display: block;
  width: clamp(13rem, 25vw, 17rem);
  height: auto;
}

.year-badge,
.status-pill {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  border: 1px solid #ccd7df;
  border-radius: 999px;
  padding: 0.38rem 0.7rem;
  color: #425463;
  background: white;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.intro {
  max-width: 850px;
  padding: clamp(2.2rem, 4vw, 3.8rem) 0 1.5rem;
}

.eyebrow,
.step-label {
  margin: 0 0 0.62rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2 {
  font-family: Georgia, "Times New Roman", serif;
  letter-spacing: -0.035em;
  line-height: 1.06;
}

h1 {
  max-width: 820px;
  margin-bottom: 0.85rem;
  font-size: clamp(2.4rem, 5.4vw, 4.2rem);
  font-weight: 700;
  overflow-wrap: anywhere;
}

h2 {
  margin-bottom: 0.5rem;
  font-size: clamp(1.65rem, 3vw, 2.45rem);
}

h3 {
  margin-bottom: 0.85rem;
  font-size: 1.05rem;
}

.lede {
  max-width: 730px;
  margin-bottom: 1.5rem;
  color: #40515f;
  font-size: clamp(1.08rem, 2vw, 1.28rem);
}

.privacy-note {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  width: fit-content;
  border-radius: 12px;
  padding: 0.75rem 0.9rem;
  color: #334c5e;
  background: var(--blue-soft);
}

.privacy-note p {
  margin: 0;
  font-size: 0.93rem;
}

.privacy-note svg {
  flex: 0 0 auto;
  margin-top: 0.05rem;
}

.calculator-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
  gap: 1.35rem;
  align-items: start;
  padding: 1.25rem 0 4.5rem;
}

.calculator-card,
.result-card,
.calculation-alert {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.calculator-card,
.result-card {
  padding: clamp(1.2rem, 3vw, 2rem);
}

.calculator-card {
  position: sticky;
  top: 1rem;
}

.card-heading {
  margin-bottom: 1.6rem;
}

.card-heading h2 {
  margin: 0;
}

.field-group {
  margin: 0 0 1.4rem;
  padding: 0;
  border: 0;
}

.field-group > label,
.field-group > legend {
  display: block;
  margin-bottom: 0.5rem;
  color: #263b4a;
  font-size: 0.94rem;
  font-weight: 750;
}

input[type="number"] {
  width: 100%;
  min-height: 48px;
  border: 1px solid #bdc9d2;
  border-radius: 10px;
  padding: 0.7rem 0.8rem;
  color: var(--ink);
  background: white;
  font-size: 1rem;
}

input:focus-visible,
button:focus-visible,
summary:focus-visible,
a:focus-visible {
  outline: 3px solid rgba(179, 92, 38, 0.32);
  outline-offset: 2px;
}

.money-input {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  border: 1px solid #bdc9d2;
  border-radius: 10px;
  overflow: hidden;
  background: white;
}

.money-input:focus-within {
  outline: 3px solid rgba(179, 92, 38, 0.32);
  outline-offset: 2px;
}

.money-input span {
  padding-left: 0.85rem;
  color: #5a6873;
  font-weight: 700;
}

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

.field-help {
  margin: 0.45rem 0 0;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.45;
}

.choice-card {
  display: grid !important;
  grid-template-columns: auto 1fr;
  gap: 0.7rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.85rem;
  cursor: pointer;
}

.choice-card + .choice-card {
  margin-top: 0.55rem;
}

.choice-card:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.choice-card input {
  margin-top: 0.2rem;
  accent-color: var(--accent);
}

.choice-card strong,
.choice-card small {
  display: block;
}

.choice-card small {
  margin-top: 0.16rem;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 450;
}

.divided-field {
  border-top: 1px solid var(--line);
  padding-top: 1.35rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
}

button {
  border: 0;
  cursor: pointer;
}

.primary-button {
  min-height: 48px;
  border-radius: 10px;
  padding: 0.78rem 1rem;
  color: white;
  background: var(--ink);
  font-weight: 750;
}

.primary-button:hover {
  background: #243f53;
}

.text-button {
  min-height: 44px;
  padding: 0.65rem 0.5rem;
  color: var(--accent-dark);
  background: transparent;
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

.result-column {
  min-width: 0;
}

.calculation-alert {
  margin-bottom: 1rem;
  border-color: #d9b48f;
  padding: 1rem 1.1rem;
  color: #70401e;
  background: #fff8f1;
  box-shadow: none;
}

.calculation-alert[data-tone="error"] {
  border-color: #e4b6b6;
  color: var(--error);
  background: var(--error-soft);
}

.result-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.headline-result {
  border-block: 1px solid var(--line);
  padding: 1.2rem 0;
}

.headline-result span,
.headline-result strong {
  display: block;
}

.headline-result span {
  color: var(--muted);
  font-size: 0.86rem;
}

.headline-result strong {
  margin-top: 0.2rem;
  color: var(--accent-dark);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.1;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
  margin: 1.1rem 0;
}

.result-grid article {
  border-radius: 12px;
  padding: 1rem;
  background: var(--soft);
}

dl,
dd {
  margin: 0;
}

dl > div {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.8rem;
  border-top: 1px solid #dce3e8;
  padding: 0.68rem 0;
}

dt {
  color: #53616c;
  font-size: 0.82rem;
}

dd {
  text-align: right;
  font-size: 0.86rem;
  font-weight: 750;
}

.calculation-steps {
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}

.calculation-steps summary {
  padding: 0.85rem 1rem;
  cursor: pointer;
  color: #2a4354;
  font-weight: 750;
}

.calculation-steps[open] summary {
  border-bottom: 1px solid var(--line);
}

.calculation-steps ol {
  margin: 0;
  padding: 0.4rem 1rem 0.65rem 2.6rem;
}

.calculation-steps li {
  padding: 0.62rem 0.2rem 0.62rem 0.25rem;
}

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

.calculation-steps li span {
  color: var(--muted);
  font-size: 0.84rem;
}

.calculation-steps li strong {
  margin-top: 0.1rem;
  font-size: 0.95rem;
}

.calculation-steps li strong span {
  display: inline;
  color: inherit;
  font-size: inherit;
}

.rounding-note {
  margin: 0;
  border-top: 1px solid var(--line);
  padding: 0.8rem 1rem;
  color: var(--muted);
  font-size: 0.82rem;
}

.compact-summary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.4rem 1rem;
  margin-top: 1.1rem;
}

.compact-summary div {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  border-bottom: 1px solid var(--line);
  padding: 0.55rem 0;
}

.compact-summary span {
  color: var(--muted);
  font-size: 0.8rem;
}

.compact-summary strong {
  text-align: right;
  font-size: 0.82rem;
}

.explanation,
.limits,
.sources {
  margin-bottom: 4.5rem;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 1.5rem;
}

.difference-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.difference-grid article {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1.15rem;
  background: white;
}

.number-mark {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  margin-bottom: 1.3rem;
  border-radius: 50%;
  color: white;
  background: var(--accent);
  font-size: 0.8rem;
  font-weight: 800;
}

.difference-grid p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.limits {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  gap: 2rem;
  border-radius: 18px;
  padding: clamp(1.4rem, 4vw, 2.5rem);
  color: white;
  background: var(--ink);
}

.limits .eyebrow {
  color: #f1a976;
}

.limits ul {
  margin: 0;
  padding-left: 1.2rem;
}

.limits li + li {
  margin-top: 0.65rem;
}

.sources {
  max-width: 800px;
}

.sources h2 {
  font-size: 1.55rem;
}

.sources p {
  color: var(--muted);
}

.source-meta {
  font-size: 0.86rem;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid var(--line);
  padding: 1.4rem 0 2.5rem;
  color: var(--muted);
  font-size: 0.82rem;
}

footer p {
  margin: 0;
}

[hidden] {
  display: none !important;
}

@media (max-width: 900px) {
  .calculator-layout {
    grid-template-columns: 1fr;
  }

  .calculator-card {
    position: static;
  }

  .difference-grid {
    grid-template-columns: 1fr;
  }

  .limits {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  body {
    background: var(--soft);
  }

  .site-header,
  main,
  footer {
    width: min(100% - 1.25rem, 1180px);
  }

  .site-header {
    min-height: 66px;
  }

  .brand-logo {
    width: clamp(10.8rem, 48vw, 13.3rem);
  }

  .year-badge {
    font-size: 0.68rem;
  }

  .intro {
    padding-top: 2.6rem;
  }

  h1 {
    font-size: clamp(2.25rem, 10.5vw, 3rem);
  }

  .calculator-layout {
    padding-top: 0.6rem;
  }

  .result-heading {
    display: block;
  }

  .status-pill {
    margin-top: 0.75rem;
  }

  .result-grid,
  .compact-summary {
    grid-template-columns: 1fr;
  }

  .button-row {
    align-items: stretch;
  }

  .primary-button {
    width: 100%;
  }

  footer {
    display: block;
  }

  footer p + p {
    margin-top: 0.45rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}