:root {
  color-scheme: light dark;
  --background: #fafafa;
  --surface: #ffffff;
  --surface-soft: #f4f5f6;
  --text: #17191c;
  --muted: #5f6670;
  --border: #e5e7eb;
  --shadow: 0 14px 36px rgba(17, 24, 39, 0.09);
  --accent: #475569;
  --accent-soft: #eef2f6;
  --accent-contrast: #ffffff;
  --danger: #b42318;
  --radius: 14px;
  --content: 680px;
  --wide: 860px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
}

html[data-cluster="investing"] {
  --accent: #0f766e;
  --accent-soft: #e8f5f3;
}

html[data-cluster="health"] {
  --accent: #e05d44;
  --accent-soft: #fbece8;
  --accent-contrast: #17191c;
}

html[data-cluster="dates"] {
  --accent: #4f46e5;
  --accent-soft: #eeedff;
}

html[data-cluster="travel"] {
  --accent: #d97706;
  --accent-soft: #fff2df;
  --accent-contrast: #17191c;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  text-rendering: optimizeLegibility;
}

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

a:hover {
  text-decoration-thickness: 0.14em;
}

button,
input,
select {
  color: inherit;
  font: inherit;
}

button,
input,
select,
a {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

[hidden] {
  display: none !important;
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: 8px;
  left: 8px;
  padding: 8px 12px;
  border-radius: 8px;
  background: var(--surface);
  transform: translateY(-160%);
}

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

.site-header {
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--background) 94%, transparent);
}

.header-inner,
.footer-inner {
  width: min(calc(100% - 32px), var(--wide));
  margin-inline: auto;
}

.header-inner {
  min-height: 54px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.site-brand {
  color: var(--text);
  font-size: 0.94rem;
  font-weight: 760;
  letter-spacing: -0.015em;
  text-decoration: none;
}

.site-brand::after {
  content: "";
  display: block;
  width: 28px;
  height: 2px;
  margin-top: 1px;
  background: var(--accent);
}

.top-nav,
.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
}

.top-nav a {
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 650;
  text-decoration: none;
}

.page {
  width: min(calc(100% - 32px), var(--content));
  margin-inline: auto;
  padding: 28px 0 64px;
}

.page.wide {
  width: min(calc(100% - 32px), var(--wide));
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 8px;
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.78rem;
}

.breadcrumbs a {
  color: inherit;
}

h1,
h2,
h3 {
  line-height: 1.18;
  letter-spacing: -0.025em;
}

h1 {
  max-width: 18ch;
  margin: 0 0 12px;
  font-size: clamp(2rem, 8vw, 3rem);
}

h2 {
  margin: 42px 0 12px;
  font-size: clamp(1.45rem, 4vw, 1.85rem);
}

h3 {
  margin: 24px 0 7px;
  font-size: 1.08rem;
}

p,
ul,
ol {
  margin: 0 0 16px;
}

.snippet {
  margin: 0 0 18px;
  padding-left: 14px;
  border-left: 3px solid var(--accent);
  color: var(--muted);
  font-size: 1rem;
}

.calculator {
  margin: 0;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.calculator-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.calculator-header h2 {
  margin: 0;
  font-size: 1rem;
  letter-spacing: 0;
}

.calculator-header p {
  margin: 0;
  color: var(--muted);
  font-size: 0.76rem;
}

.segmented {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  gap: 4px;
  margin-bottom: 12px;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-soft);
}

.segmented input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.segmented label {
  min-height: 44px;
  display: grid;
  place-items: center;
  padding: 6px 9px;
  border: 1px solid transparent;
  border-radius: 7px;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 700;
  text-align: center;
}

.segmented input:checked + label {
  border-color: var(--border);
  background: var(--surface);
  color: var(--text);
}

.segmented input:focus-visible + label {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.compact-toggle-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 12px;
}

.compact-toggle-row .segmented,
.field-stack > .segmented {
  margin-bottom: 0;
}

.field-stack {
  display: grid;
  gap: 10px;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.control > label,
.control > .label-row {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 4px;
  font-size: 0.78rem;
  font-weight: 710;
}

.unit {
  color: var(--muted);
  font-weight: 500;
}

.range-row {
  display: grid;
  grid-template-columns: minmax(70px, 1fr) 88px;
  align-items: center;
  gap: 10px;
}

input[type="number"],
input[type="date"],
select {
  width: 100%;
  min-height: 42px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--background);
}

input:invalid {
  border-color: color-mix(in srgb, var(--danger) 55%, var(--border));
}

input[type="range"] {
  width: 100%;
  height: 32px;
  margin: 0;
  accent-color: var(--accent);
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb:active {
  transform: scale(1.12);
}

.helper {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 0.73rem;
}

.inline-check {
  min-height: 44px;
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 0.86rem;
  font-weight: 650;
}

.inline-check input {
  width: 20px;
  height: 20px;
  accent-color: var(--accent);
}

.result-card {
  position: relative;
  min-height: 190px;
  margin-top: 12px;
  padding: 18px;
  border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--border));
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.result-label {
  display: block;
  margin-bottom: 3px;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.09em;
}

.result-value {
  display: inline-block;
  color: var(--accent);
  font-size: clamp(2rem, 6vw, 3rem);
  font-variant-numeric: tabular-nums;
  font-weight: 790;
  line-height: 1.05;
  letter-spacing: -0.045em;
  transition: background-color 150ms ease;
}

.result-value.is-updated {
  animation: result-pulse 300ms ease;
}

@keyframes result-pulse {
  0% { background: transparent; }
  35% { background: var(--accent-soft); }
  100% { background: transparent; }
}

.result-context {
  margin: 6px 0 12px;
  color: var(--muted);
  font-size: 0.82rem;
}

.result-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 0 0 13px;
}

.result-stats div {
  padding-top: 7px;
  border-top: 1px solid var(--border);
}

.result-stats dt {
  color: var(--muted);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.result-stats dd {
  margin: 1px 0 0;
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
  font-weight: 720;
}

.result-stats.three-up {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.result-stats.three-up dt,
.result-stats.three-up dd {
  white-space: normal;
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.ghost-button {
  min-height: 44px;
  padding: 6px 11px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  cursor: pointer;
  font-size: 0.76rem;
  font-weight: 700;
}

.ghost-button:hover {
  border-color: var(--accent);
}

.affiliate-cta {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 12px;
  padding: 9px 14px;
  border-radius: 9px;
  background: var(--accent);
  color: var(--accent-contrast);
  font-size: 0.88rem;
  font-weight: 760;
  text-decoration: none;
}

.tool-error {
  margin: 9px 0 0;
  color: var(--danger);
  font-size: 0.8rem;
  font-weight: 650;
}

.disclaimer-note {
  margin: 8px 2px 0;
  color: var(--muted);
  font-size: 0.7rem;
}

.ad-slot {
  min-height: 90px;
  display: grid;
  place-items: center;
  margin: 22px 0;
  border: 1px dashed var(--border);
  border-radius: 8px;
  color: var(--muted);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.formula {
  overflow-x: auto;
  margin: 12px 0 18px;
  padding: 12px 14px;
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
  background: var(--surface-soft);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.86rem;
  white-space: pre-wrap;
}

.table-scroll {
  overflow-x: auto;
  margin: 14px 0 22px;
  border: 1px solid var(--border);
  border-radius: 10px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
}

th,
td {
  padding: 9px 10px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  white-space: nowrap;
}

th {
  background: var(--surface-soft);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
}

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

tr.is-current td,
tr.is-current th {
  background: var(--accent-soft);
}

.faq-item {
  padding: 15px 0;
  border-top: 1px solid var(--border);
}

.faq-item h3,
.faq-item p {
  margin-top: 0;
}

.faq-item p {
  margin-bottom: 0;
  color: var(--muted);
}

.citations {
  padding-left: 20px;
  color: var(--muted);
  font-size: 0.85rem;
}

.related-tools {
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.related-tools h2 {
  margin-top: 0;
  font-size: 1.25rem;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 22px 0 34px;
}

.tool-card {
  min-height: 150px;
  display: flex;
  flex-direction: column;
  padding: 18px;
  border: 1px solid var(--border);
  border-top: 3px solid var(--card-accent, var(--accent));
  border-radius: 12px;
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
}

.tool-card:hover {
  border-color: var(--card-accent, var(--accent));
}

.tool-card strong {
  margin-bottom: 7px;
  font-size: 1.08rem;
}

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

.tool-card.investing { --card-accent: #0f766e; }
.tool-card.health { --card-accent: #e05d44; }
.tool-card.dates { --card-accent: #4f46e5; }
.tool-card.travel { --card-accent: #d97706; }

.trust-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  padding: 0;
  list-style: none;
}

.trust-list li {
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  font-size: 0.84rem;
}

.site-footer {
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 0 32px;
  color: var(--muted);
  font-size: 0.75rem;
}

.footer-inner p {
  margin: 0;
}

.site-footer a {
  color: inherit;
}

noscript p {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-soft);
  font-size: 0.82rem;
}

@media (max-width: 560px) {
  .page {
    padding-top: 20px;
  }

  h1 {
    font-size: clamp(1.9rem, 9vw, 2.45rem);
  }

  .calculator {
    padding: 13px;
  }

  .field-grid {
    gap: 8px;
  }

  .range-row {
    grid-template-columns: minmax(60px, 1fr) 80px;
    gap: 7px;
  }

  .result-card {
    min-height: 176px;
    padding: 16px;
  }

  .tool-grid,
  .trust-list {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #111418;
    --surface: #181c21;
    --surface-soft: #20252b;
    --text: #f3f4f6;
    --muted: #b0b7c1;
    --border: #2a2f36;
    --shadow: 0 16px 38px rgba(0, 0, 0, 0.28);
    --accent-contrast: #111418;
  }

  html[data-cluster="investing"] { --accent: #44c5b8; --accent-soft: #183b38; }
  html[data-cluster="health"] { --accent: #ff8c73; --accent-soft: #452821; }
  html[data-cluster="dates"] { --accent: #9994ff; --accent-soft: #28264a; }
  html[data-cluster="travel"] { --accent: #f1aa54; --accent-soft: #402f1c; }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}