:root {
  color-scheme: light;
  --ink: #071b36;
  --muted: #52657a;
  --paper: #f8fbff;
  --surface: #ffffff;
  --surface-alt: #eef5fc;
  --line: #d6e2ef;
  --line-strong: #b9ccdf;
  --control-border: #7894af;
  --brand: #075bda;
  --brand-dark: #062e63;
  --accent: #0878ff;
  --accent-soft: #eaf4ff;
  --success: #176c55;
  --error: #a33b2b;
  --focus: #0878ff;
  --shadow: 0 14px 35px rgba(6, 46, 99, 0.11);
  --radius: 0.75rem;
  --radius-sm: 0.4rem;
  --content: 72rem;
  --measure: 46rem;
  --space-1: 0.35rem;
  --space-2: 0.65rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-width: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

img,
svg {
  display: block;
  max-width: 100%;
}

button,
input,
select {
  font: inherit;
}

button,
select {
  cursor: pointer;
}

a {
  color: var(--brand-dark);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.16em;
}

a:hover {
  color: var(--brand);
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

::selection {
  background: #dcecff;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.5rem;
  left: 0.5rem;
  transform: translateY(-150%);
  padding: 0.7rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--ink);
  color: #fff;
}

.skip-link:focus {
  transform: translateY(0);
}

.container {
  width: min(100% - 2rem, var(--content));
  margin-inline: auto;
}

.measure {
  max-width: var(--measure);
}

.eyebrow {
  margin: 0 0 var(--space-2);
  color: var(--brand);
  font-size: 0.77rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  line-height: 1.2;
  text-transform: uppercase;
}

.lede {
  max-width: 44rem;
  margin: 0;
  color: var(--muted);
  font-size: clamp(1.03rem, 1.8vw, 1.22rem);
  line-height: 1.55;
}

h1,
h2,
h3 {
  margin-top: 0;
  color: var(--ink);
  font-weight: 750;
  letter-spacing: -0.028em;
  line-height: 1.15;
}

h1 {
  max-width: 52rem;
  margin-bottom: var(--space-3);
  font-size: clamp(2.25rem, 7vw, 4.6rem);
}

h2 {
  margin-bottom: var(--space-3);
  font-size: clamp(1.65rem, 4vw, 2.55rem);
}

h3 {
  margin-bottom: 0.45rem;
  font-size: 1.16rem;
}

p,
ul,
ol {
  margin-top: 0;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(248, 251, 255, 0.97);
}

.header-inner {
  display: flex;
  min-height: 4.4rem;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
}

.brand {
  display: inline-flex;
  flex: 0 1 auto;
  min-width: 0;
  min-height: 2.75rem;
  align-items: center;
  color: var(--ink);
  line-height: 1;
  text-decoration: none;
}

.header-inner .brand-logo img {
  display: block;
  width: clamp(10.75rem, 65vw, 13rem);
  max-width: 100%;
  height: auto;
}

.footer-brand .brand-logo img {
  display: block;
  width: clamp(13rem, 60vw, 15rem);
  max-width: 100%;
  height: auto;
}

.nav-toggle {
  display: inline-flex;
  min-width: 2.8rem;
  min-height: 2.8rem;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--control-border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--ink);
  font-size: 0.92rem;
  font-weight: 750;
}

.site-nav {
  position: absolute;
  z-index: 20;
  top: 4.4rem;
  right: 1rem;
  left: 1rem;
  display: none;
  padding: 0.55rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.site-nav.is-open {
  display: block;
}

.nav-list {
  display: grid;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-list a {
  display: block;
  min-height: 2.75rem;
  padding: 0.65rem 0.8rem;
  border-radius: var(--radius-sm);
  color: var(--ink);
  font-size: 0.92rem;
  font-weight: 680;
  text-decoration: none;
}

.nav-list a:hover,
.nav-list a[aria-current="page"] {
  background: var(--surface-alt);
  color: var(--brand-dark);
}

.breadcrumbs {
  padding-top: var(--space-4);
  color: var(--muted);
  font-size: 0.85rem;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumbs li:not(:last-child)::after {
  margin-left: 0.35rem;
  color: var(--line-strong);
  content: "/";
}

.breadcrumbs [aria-current="page"] {
  color: var(--muted);
}

.page-hero,
.home-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.home-hero {
  padding: clamp(2.5rem, 7vw, 5.6rem) 0;
  background-color: #f5f9ff;
  background-image: linear-gradient(rgba(7, 91, 218, 0.06) 1px, transparent 1px), linear-gradient(90deg, rgba(7, 91, 218, 0.06) 1px, transparent 1px);
  background-size: 2.25rem 2.25rem;
}

.home-hero::after {
  position: absolute;
  z-index: 0;
  top: 0;
  bottom: 0;
  left: max(0px, calc(50% + 26rem));
  width: 0.38rem;
  background: var(--accent);
  content: "";
  pointer-events: none;
}

.page-hero {
  padding: var(--space-4) 0 var(--space-5);
  background: var(--paper);
}

.page-hero .calculator {
  margin-top: var(--space-5);
}

.home-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  align-items: center;
  gap: var(--space-5);
}

.hero-copy .trust-line {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.25rem;
  margin: var(--space-4) 0 0;
  padding: 0;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 650;
  list-style: none;
}

.trust-line li::before {
  margin-right: 0.4rem;
  color: var(--brand);
  content: "✓";
}

.section {
  padding: clamp(3rem, 7vw, 5.5rem) 0;
}

.section + .section {
  border-top: 1px solid var(--line);
}

.section-header {
  display: grid;
  gap: 0.5rem;
  margin-bottom: var(--space-5);
}

.section-header p {
  max-width: 42rem;
  margin-bottom: 0;
  color: var(--muted);
}

.calculator {
  position: relative;
  padding: clamp(1.15rem, 4vw, 2rem);
  border: 1px solid var(--line-strong);
  border-top: 0.3rem solid var(--brand);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.calculator-compact {
  max-width: 52rem;
}

.calculator h2 {
  margin-bottom: var(--space-4);
  font-size: 1.35rem;
}

.field-grid {
  display: grid;
  gap: var(--space-3);
}

.field {
  min-width: 0;
}

.field label,
.field-label {
  display: block;
  margin-bottom: 0.42rem;
  color: var(--ink);
  font-size: 0.88rem;
  font-weight: 760;
}

.input-wrap {
  display: flex;
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--control-border);
  border-radius: var(--radius-sm);
  background: #fff;
}

.input-wrap:focus-within {
  border-color: var(--focus);
  outline: 3px solid rgba(8, 120, 255, 0.2);
}

.input-wrap input,
.input-wrap select,
.field > input,
.field > select {
  width: 100%;
  min-width: 0;
  min-height: 3.25rem;
  border: 1px solid var(--control-border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--ink);
  font-size: 1rem;
}

.input-wrap input,
.input-wrap select {
  border: 0;
  border-radius: 0;
}

.input-wrap input:focus,
.input-wrap select:focus {
  outline: 0;
}

.input-wrap input,
.field > input {
  padding: 0.7rem 0.85rem;
  font-variant-numeric: tabular-nums;
}

.input-wrap select,
.field > select {
  padding: 0.7rem 2rem 0.7rem 0.75rem;
}

.unit {
  display: inline-flex;
  min-width: 3.5rem;
  align-items: center;
  justify-content: center;
  border-left: 1px solid var(--line);
  background: var(--surface-alt);
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 800;
}

.field-note,
.form-status {
  margin: 0.4rem 0 0;
  color: var(--muted);
  font-size: 0.81rem;
}

.form-status {
  min-height: 1.35rem;
}

.form-status[data-state="error"] {
  color: var(--error);
}

.calculator-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
  margin-top: var(--space-3);
}

.button-small {
  min-height: 2.7rem;
  padding: 0.56rem 0.8rem;
  font-size: 0.84rem;
}

.share-status {
  flex-basis: 100%;
  min-height: 1.3rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.81rem;
}

.button {
  display: inline-flex;
  min-height: 2.85rem;
  align-items: center;
  justify-content: center;
  padding: 0.68rem 1rem;
  border: 1px solid var(--brand);
  border-radius: var(--radius-sm);
  background: var(--brand);
  color: #fff;
  font-size: 0.92rem;
  font-weight: 780;
  text-decoration: none;
}

.button:hover {
  border-color: var(--brand-dark);
  background: var(--brand-dark);
  color: #fff;
}

.button-secondary {
  border-color: var(--control-border);
  background: var(--surface);
  color: var(--ink);
}

.button-secondary:hover {
  background: var(--surface-alt);
  color: var(--ink);
}

.results {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--line);
}

.result-lead {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.4rem 1rem;
  margin-bottom: var(--space-3);
}

.result-label {
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.result-value {
  overflow-wrap: anywhere;
  color: var(--brand-dark);
  font-size: clamp(1.65rem, 7vw, 2.55rem);
  font-variant-numeric: tabular-nums;
  font-weight: 820;
  letter-spacing: -0.04em;
  line-height: 1.1;
}

.result-value .result-unit {
  color: var(--muted);
  font-size: 0.48em;
  letter-spacing: 0;
}

.result-value-text {
  max-width: 100%;
  font-size: clamp(1.1rem, 4.4vw, 1.55rem);
  letter-spacing: -0.01em;
  text-align: right;
}

.comparison-result {
  margin: var(--space-3) 0 0;
  color: var(--brand-dark);
  font-weight: 780;
}

.utility-disclosure,
.utility-section {
  width: 100%;
  max-width: 52rem;
  margin-top: var(--space-4);
}

.utility-disclosure {
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
}

.utility-disclosure > summary {
  display: grid;
  gap: 0.18rem;
  min-height: 3.4rem;
  align-content: center;
  padding: 0.8rem 1rem;
  color: var(--ink);
  cursor: pointer;
  font-weight: 790;
}

.utility-disclosure > summary small {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 520;
}

.utility-disclosure[open] > summary {
  border-bottom: 1px solid var(--line);
  background: var(--surface-alt);
}

.utility-disclosure .calculator {
  max-width: none;
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

.utility-section > .section-header {
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
}

.utility-section > .section-header h2 {
  margin-bottom: 0;
  font-size: 1.55rem;
}

.comparison-grid {
  display: grid;
  gap: var(--space-3);
}

.comparison-grid fieldset {
  min-width: 0;
  margin: 0;
  padding: var(--space-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

.comparison-grid legend {
  padding: 0 0.35rem;
  color: var(--brand-dark);
  font-weight: 800;
}

.optional-label {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 520;
}

.precision-line {
  margin: 0.4rem 0 0;
  color: var(--muted);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.78rem;
  overflow-wrap: anywhere;
}

.result-grid {
  display: grid;
  gap: 0;
  margin: 0;
  border-top: 1px solid var(--line);
}

.result-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.72rem 0;
  border-bottom: 1px solid var(--line);
}

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

.result-row dd {
  margin: 0;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  font-weight: 760;
  text-align: right;
}

.formula {
  display: inline-block;
  max-width: 100%;
  padding: 0.72rem 0.9rem;
  border-left: 0.25rem solid var(--accent);
  background: var(--accent-soft);
  color: var(--ink);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: clamp(0.84rem, 2.6vw, 0.98rem);
  font-weight: 700;
  overflow-wrap: anywhere;
}

.content-grid {
  display: grid;
  gap: var(--space-6);
}

.content-grid > * {
  min-width: 0;
}

.prose {
  max-width: var(--measure);
}

.prose p,
.prose li {
  color: #2f4861;
}

.prose h2 {
  margin-top: var(--space-6);
}

.prose h3 {
  margin-top: var(--space-5);
}

.prose > :first-child {
  margin-top: 0;
}

.link-grid,
.tool-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  list-style: none;
}

.link-grid a,
.tool-list a {
  display: grid;
  min-height: 4.2rem;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-3);
  align-items: center;
  padding: 0.8rem 0.15rem;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-weight: 730;
  text-decoration: none;
}

.link-grid a::after,
.tool-list a::after {
  color: var(--accent);
  content: "→";
  font-size: 1.25rem;
}

.link-grid a:hover,
.tool-list a:hover {
  color: var(--brand);
}

.tool-list .tool-description {
  display: block;
  margin-top: 0.15rem;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 500;
}

.table-wrap {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  min-width: 30rem;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}

th,
td {
  padding: 0.72rem 0.9rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

th {
  background: var(--surface-alt);
  color: var(--ink);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

tr:last-child td {
  border-bottom: 0;
}

.chart-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: end;
  max-width: 52rem;
  margin-bottom: var(--space-4);
}

.chart-filter .field {
  flex: 1 1 16rem;
}

.chart-filter .form-status {
  flex-basis: 100%;
  margin: 0;
}

.chart-table-wrap {
  max-height: 42rem;
  overflow: auto;
}

.chart-table {
  min-width: 22rem;
}

.chart-table thead {
  position: sticky;
  z-index: 1;
  top: 0;
}

.chart-table tbody th {
  background: var(--surface);
  font-size: 0.9rem;
  font-weight: 760;
  letter-spacing: 0;
  text-transform: none;
}

.chart-table tbody tr:last-child th,
.chart-table tbody tr:last-child td {
  border-bottom: 0;
}

.chart-notes {
  margin-top: var(--space-5);
}

.number-list {
  display: grid;
  gap: var(--space-3);
  padding: 0;
  counter-reset: steps;
  list-style: none;
}

.number-list li {
  position: relative;
  padding-left: 2.7rem;
  counter-increment: steps;
}

.number-list li::before {
  position: absolute;
  top: -0.05rem;
  left: 0;
  display: grid;
  width: 1.8rem;
  height: 1.8rem;
  place-items: center;
  border-radius: 50%;
  background: var(--brand);
  color: #fff;
  content: counter(steps);
  font-size: 0.77rem;
  font-weight: 800;
}

.faq-list {
  border-top: 1px solid var(--line-strong);
}

.faq-list details {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  padding: 1rem 2rem 1rem 0;
  color: var(--ink);
  font-weight: 730;
}

.faq-list details p {
  max-width: 44rem;
  padding-bottom: 1rem;
  color: var(--muted);
}

.note {
  padding: 0.9rem 1rem;
  border-left: 0.25rem solid var(--brand);
  background: var(--surface-alt);
  color: #2f4861;
  font-size: 0.91rem;
}

.plate-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.plate-list li {
  padding: 0.48rem 0.68rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--surface);
  font-size: 0.84rem;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

.two-column {
  display: grid;
  gap: var(--space-5);
}

.mini-stat {
  padding: 1rem 0;
  border-top: 0.2rem solid var(--accent);
}

.mini-stat strong {
  display: block;
  color: var(--brand-dark);
  font-size: 1.4rem;
  font-variant-numeric: tabular-nums;
}

.site-footer {
  padding: var(--space-6) 0 var(--space-4);
  border-top: 1px solid var(--line-strong);
  background: #edf4fb;
}

.footer-grid {
  display: grid;
  gap: var(--space-5);
}

.footer-brand p {
  max-width: 25rem;
  margin: 0.8rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-links h2 {
  margin-bottom: 0.7rem;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.footer-links ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links li + li {
  margin-top: 0.35rem;
}

.footer-links a {
  color: #2f4861;
  font-size: 0.9rem;
  text-decoration: none;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.6rem 1rem;
  margin-top: var(--space-5);
  padding-top: var(--space-3);
  border-top: 1px solid var(--line-strong);
  color: var(--muted);
  font-size: 0.78rem;
}

.not-found {
  display: grid;
  min-height: 64vh;
  align-content: center;
  padding: var(--space-7) 0;
}

.not-found-code {
  margin: 0;
  color: var(--accent);
  font-size: clamp(4rem, 20vw, 9rem);
  font-weight: 900;
  letter-spacing: -0.08em;
  line-height: 0.85;
}

.noscript {
  margin: 0;
  padding: 0.75rem 1rem;
  background: #fff2cc;
  color: #4d3b00;
  text-align: center;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

@media (min-width: 40rem) {
  .container {
    width: min(100% - 3rem, var(--content));
  }

  .field-grid-2,
  .field-grid-3,
  .two-column,
  .link-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .comparison-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .link-grid a:nth-child(odd) {
    padding-right: 1.25rem;
  }

  .link-grid a:nth-child(even) {
    padding-left: 1.25rem;
  }

  .footer-grid {
    grid-template-columns: minmax(16rem, 2fr) repeat(2, minmax(9rem, 1fr));
  }
}

@media (min-width: 56rem) {
  .header-inner {
    gap: var(--space-3);
  }

  .header-inner .brand-logo img {
    width: clamp(13.75rem, 22vw, 15.5rem);
  }

  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    display: block;
    padding: 0;
    border: 0;
    background: transparent;
    box-shadow: none;
  }

  .nav-list {
    display: flex;
    align-items: center;
    gap: 0.2rem;
  }

  .home-hero-grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(25rem, 0.78fr);
    gap: clamp(3rem, 7vw, 7rem);
  }

  .home-hero h1 {
    font-size: clamp(3.6rem, 6vw, 5rem);
  }

  .page-hero {
    padding: var(--space-5) 0 var(--space-6);
  }

  .page-hero h1 {
    font-size: clamp(2.7rem, 5vw, 4.25rem);
  }

  .content-grid {
    grid-template-columns: minmax(0, 1fr) minmax(17rem, 0.4fr);
    align-items: start;
  }

  .sidebar {
    position: sticky;
    top: 1.5rem;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  .site-header,
  .site-footer,
  .breadcrumbs,
  .calculator-actions,
  .related-tools {
    display: none !important;
  }

  body {
    background: #fff;
  }

  .calculator {
    border: 1px solid #777;
    box-shadow: none;
  }
}