:root {
  color-scheme: light;
  --teal: oklch(55% 0.12 175);
  --teal-dark: oklch(35% 0.10 175);
  --teal-light: oklch(88% 0.05 175);
  --gold: oklch(70% 0.14 75);
  --gold-soft: oklch(88% 0.08 78);
  --cream: oklch(97% 0.01 80);
  --cream-raised: oklch(99% 0.005 80);
  --cream-subtle: oklch(94% 0.012 80);
  --ink: oklch(15% 0.01 60);
  --ink-secondary: oklch(36% 0.01 60);
  --ink-muted: oklch(55% 0.01 60);
  --rule: oklch(84% 0.008 60);
  --rule-strong: oklch(73% 0.01 60);
  --radius: 8px;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --wrap: 72rem;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quint: cubic-bezier(0.22, 1, 0.36, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  margin: 0;
  background: var(--cream);
  color: var(--ink);
  font-family: "Source Sans 3", "Avenir Next", "PingFang SC", "Hiragino Sans GB", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.55;
  letter-spacing: 0;
  overflow-x: hidden;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--teal-dark);
  text-decoration-color: color-mix(in oklch, var(--teal), transparent 45%);
  text-underline-offset: 0.18em;
}

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

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

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

h1,
h2,
h3,
strong {
  font-family: "Avenir Next", "Trebuchet MS", "PingFang SC", "Hiragino Sans GB", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
}

html[lang="zh-Hans"] body {
  font-family: "PingFang SC", "Hiragino Sans GB", "STHeiti", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  line-height: 1.68;
}

html[lang="zh-Hans"] h1,
html[lang="zh-Hans"] h2,
html[lang="zh-Hans"] h3,
html[lang="zh-Hans"] strong,
html[lang="zh-Hans"] .button {
  font-family: "PingFang SC", "Hiragino Sans GB", "STHeiti", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
}

html[lang="zh-Hans"] h1 {
  max-width: 12ch;
  font-size: 3.25rem;
  line-height: 1.1;
}

html[lang="zh-Hans"] .title-line {
  white-space: nowrap;
}

html[lang="zh-Hans"] h2 {
  max-width: 18ch;
}

.title-line {
  display: block;
}

h1 {
  max-width: 12ch;
  font-size: 3.45rem;
  line-height: 1.05;
  margin-bottom: var(--space-6);
}

h2 {
  max-width: 22ch;
  font-size: 2.25rem;
  line-height: 1.12;
  margin-bottom: var(--space-4);
}

h3 {
  font-size: 1rem;
  line-height: 1.25;
  margin-bottom: var(--space-3);
}

p {
  color: var(--ink-secondary);
}

small {
  color: var(--ink-muted);
  font-size: 0.875rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
  table-layout: fixed;
}

th,
td {
  padding: var(--space-4);
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--rule);
  overflow-wrap: anywhere;
}

th {
  background: var(--teal-dark);
  color: var(--cream-raised);
  font-size: 0.875rem;
}

tbody tr:nth-child(even) {
  background: var(--cream-subtle);
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: var(--space-4);
  z-index: 10;
  transform: translateY(-150%);
  background: var(--ink);
  color: var(--cream-raised);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius);
}

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

.wrap {
  width: min(100% - 2rem, var(--wrap));
  margin-inline: auto;
  min-width: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 3;
  background: color-mix(in oklch, var(--cream), transparent 8%);
  border-bottom: 1px solid var(--rule);
  backdrop-filter: blur(16px);
}

.header-inner,
.footer-inner {
  min-height: 4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 2.75rem;
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  width: 0.7rem;
  height: 0.7rem;
  background: var(--teal);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  font-size: 0.93rem;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  color: var(--ink-secondary);
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--ink);
}

.language-links {
  display: inline-flex;
  align-items: center;
  gap: 0;
  margin-left: auto;
  border: 1px solid var(--rule);
  background: var(--cream-raised);
}

.language-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 3.2rem;
  min-height: 2.25rem;
  color: var(--ink-secondary);
  font-size: 0.86rem;
  font-weight: 800;
  text-decoration: none;
}

.language-links a + a {
  border-left: 1px solid var(--rule);
}

.language-links a[aria-current="page"] {
  background: var(--teal-dark);
  color: var(--cream-raised);
}

.section-band {
  padding-block: var(--space-16);
}

.section-band.compact {
  padding-block: var(--space-12);
}

.section-band.muted {
  background: var(--cream-subtle);
  border-block: 1px solid var(--rule);
}

.hero {
  padding-top: var(--space-16);
}

.hero-grid,
.two-col,
.sources-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(20rem, 0.78fr);
  gap: var(--space-12);
  align-items: start;
}

.hero-copy,
.brief-panel,
.table-shell,
.section-head,
.layer,
.flow > div,
.cost-grid article,
.risk-grid article,
.funnel li,
.timeline li,
.scenario {
  min-width: 0;
}

.hero-copy {
  padding-top: var(--space-6);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--ink-muted);
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: var(--space-4);
}

.eyebrow::before {
  content: "";
  width: 0.7rem;
  height: 0.7rem;
  background: var(--teal);
}

.lede {
  max-width: 42rem;
  color: var(--ink-secondary);
  font-size: 1.2rem;
  line-height: 1.5;
  margin-bottom: var(--space-8);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  border-radius: var(--radius);
  border: 1px solid var(--rule);
  padding: 0.72rem 1rem;
  font-weight: 700;
  text-decoration: none;
  transition: transform 180ms var(--ease-out-expo), background-color 180ms var(--ease-out-expo), color 180ms var(--ease-out-expo), border-color 180ms var(--ease-out-expo);
}

.button:hover {
  transform: translateY(-1px);
}

.button:active {
  transform: translateY(0) scale(0.985);
}

.button.primary {
  background: var(--teal);
  border-color: var(--teal);
  color: var(--cream-raised);
}

.button.secondary {
  background: var(--cream-raised);
  color: var(--ink-secondary);
}

.brief-panel,
.table-shell,
.cost-grid article,
.risk-grid article {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--cream-raised);
}

.brief-panel {
  padding: var(--space-6);
}

.panel-label {
  color: var(--ink-secondary);
  font-weight: 800;
  margin-bottom: var(--space-5);
}

.ledger {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  font-variant-numeric: tabular-nums;
}

.ledger div {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-4) 0;
}

.ledger div:nth-child(odd) {
  padding-right: var(--space-4);
  border-right: 1px solid var(--rule);
}

.ledger div:nth-child(even) {
  padding-left: var(--space-4);
}

.ledger div:nth-child(n + 3) {
  border-top: 1px solid var(--rule);
}

.ledger strong {
  display: block;
  font-size: 1.55rem;
  line-height: 1.05;
}

.ledger span {
  display: block;
  color: var(--ink-secondary);
  font-size: 0.875rem;
  font-weight: 700;
}

.note {
  border-top: 1px solid var(--rule);
  color: var(--ink-muted);
  font-size: 0.94rem;
  margin: var(--space-6) 0 0;
  padding-top: var(--space-4);
}

.section-head {
  margin-bottom: var(--space-8);
}

.section-head p:not(.eyebrow) {
  max-width: 49rem;
  font-size: 1.08rem;
}

.section-head.inline {
  margin-bottom: 0;
}

.table-shell {
  max-width: min(100% - 2rem, var(--wrap));
  overflow-x: auto;
}

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

.signal {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-2) var(--space-4);
  align-items: baseline;
  border-bottom: 1px solid var(--rule);
  padding: var(--space-4) 0;
}

.signal span {
  color: var(--ink-secondary);
  font-weight: 700;
}

.signal strong {
  color: var(--teal-dark);
  font-size: 1.8rem;
  font-variant-numeric: tabular-nums;
}

.signal small {
  grid-column: 1 / -1;
}

.layer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-5);
}

.layer {
  min-height: 15rem;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: var(--space-5);
}

.layer span {
  color: var(--teal-dark);
  font-size: 1.4rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.layer h3 {
  margin-top: var(--space-6);
}

.layer p {
  margin-bottom: 0;
}

.layer.trust,
.layer.revenue {
  background: var(--gold-soft);
}

.layer.learning {
  background: var(--teal-light);
}

.layer.service {
  background: var(--cream-raised);
}

.flow {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-8);
  align-items: stretch;
}

.flow > div {
  border-top: 2px solid var(--teal);
  padding-top: var(--space-5);
}

.flow > div:nth-child(3) {
  border-top-color: var(--gold);
}

.flow ul,
.sources-grid ul {
  margin: 0;
  padding-left: 1.1rem;
}

.flow li,
.sources-grid li {
  margin-bottom: var(--space-2);
  color: var(--ink-secondary);
}

.scenario-bars {
  display: grid;
  gap: var(--space-5);
  margin-bottom: var(--space-8);
}

.scenario {
  display: grid;
  grid-template-columns: minmax(10rem, 0.24fr) minmax(12rem, 1fr);
  gap: var(--space-4);
  align-items: center;
}

.scenario-label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  font-variant-numeric: tabular-nums;
}

.scenario-label span {
  font-weight: 800;
}

.bar-track {
  height: 1.05rem;
  background: color-mix(in oklch, var(--rule), transparent 45%);
}

.bar-track span {
  display: block;
  height: 100%;
  background: var(--teal);
  transform-origin: left center;
}

.bar-track.gold span {
  background: var(--gold);
}

.scenario small {
  grid-column: 2;
}

.cost-grid,
.risk-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-5);
}

.cost-grid article,
.risk-grid article {
  padding: var(--space-5);
}

.cost-grid span {
  color: var(--teal-dark);
  display: block;
  font-size: 1.6rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  margin-bottom: var(--space-3);
}

.cost-grid article:nth-child(2) span {
  color: oklch(58% 0.13 75);
}

.cost-grid p,
.risk-grid p {
  margin-bottom: 0;
}

.funnel,
.timeline {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-5);
  list-style: none;
  padding-left: 0;
}

.funnel li,
.timeline li {
  min-height: 8.5rem;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--cream-raised);
  padding: var(--space-5);
}

.funnel span,
.timeline span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  background: var(--teal);
  color: var(--cream-raised);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  margin-bottom: var(--space-5);
}

.funnel li:nth-child(3),
.timeline li:nth-child(3),
.funnel li:nth-child(6),
.timeline li:nth-child(6) {
  background: color-mix(in oklch, var(--teal-light), var(--cream-raised) 25%);
}

.funnel li:nth-child(3) span,
.timeline li:nth-child(3) span,
.funnel li:nth-child(6) span,
.timeline li:nth-child(6) span {
  background: var(--gold);
  color: var(--ink);
}

.funnel strong,
.timeline strong {
  display: block;
  margin-bottom: var(--space-2);
}

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

.risk-grid article:nth-child(1) {
  background: var(--gold-soft);
}

.risk-grid article:nth-child(2) {
  background: var(--teal-light);
}

.sources-grid {
  align-items: start;
}

.sources-grid a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
}

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

.site-footer p {
  margin-bottom: 0;
  font-size: 0.94rem;
}

@media (max-width: 900px) {
  .nav-links {
    display: none;
  }

  .hero-grid,
  .two-col,
  .sources-grid {
    grid-template-columns: 1fr;
  }

  .section-head.inline {
    margin-bottom: var(--space-4);
  }

  .header-inner {
    flex-wrap: wrap;
  }

  .layer-grid,
  .flow,
  .cost-grid,
  .funnel,
  .timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.motion-ready .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 560ms var(--ease-out-expo), transform 560ms var(--ease-out-expo);
  transition-delay: var(--reveal-delay, 0ms);
}

.motion-ready .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.motion-ready .bar-track span {
  transform: scaleX(0);
  transition: transform 720ms var(--ease-out-quint);
}

.motion-ready .scenario.is-visible .bar-track span,
.motion-ready .section-band.is-visible .bar-track span {
  transform: scaleX(1);
}

@media (max-width: 640px) {
  h1 {
    font-size: 2.7rem;
  }

  html[lang="zh-Hans"] h1 {
    font-size: 2.25rem;
    max-width: none;
  }

  h2 {
    font-size: 1.85rem;
  }

  .section-band,
  .hero {
    padding-block: var(--space-12);
  }

  .ledger,
  .layer-grid,
  .flow,
  .cost-grid,
  .funnel,
  .timeline,
  .risk-grid {
    grid-template-columns: 1fr;
  }

  .ledger div,
  .ledger div:nth-child(odd),
  .ledger div:nth-child(even) {
    padding-inline: 0;
    border-right: 0;
  }

  .ledger div + div {
    border-top: 1px solid var(--rule);
  }

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

  .scenario small {
    grid-column: 1;
  }

  th,
  td {
    min-width: 0;
    padding: var(--space-3);
  }

  .table-shell {
    overflow-x: visible;
  }

  table,
  thead,
  tbody,
  tr,
  td {
    display: block;
    width: 100%;
  }

  thead {
    display: none;
  }

  tr {
    border-bottom: 1px solid var(--rule);
    padding: var(--space-3) 0;
  }

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

  td {
    border-bottom: 0;
    padding: var(--space-2) var(--space-4);
  }

  td::before {
    content: attr(data-label);
    display: block;
    color: var(--ink-muted);
    font-size: 0.76rem;
    font-weight: 800;
    margin-bottom: var(--space-1);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .motion-ready .reveal {
    opacity: 1 !important;
    transform: none !important;
  }

  .motion-ready .bar-track span {
    transform: none !important;
  }
}