:root {
  --black: #000;
  --white: #f7f7f4;
  --panel: #151515;
  --panel-soft: #0d0d0d;
  --line: rgba(247, 247, 244, 0.16);
  --line-strong: rgba(247, 247, 244, 0.3);
  --muted: rgba(247, 247, 244, 0.58);
  --faint: rgba(247, 247, 244, 0.34);
  --pink: #f37698;
  --violet: #9787ed;
  --aqua: #72d9ce;
  --sans: Arial, "Helvetica Neue", Helvetica, "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 70px;
  background: var(--black);
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--black);
  color: var(--white);
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
}

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

.shell {
  width: min(calc(100% - 48px), 1240px);
  margin: 0 auto;
}

.brand-star {
  display: inline-block;
  width: 17px;
  height: 17px;
  flex: 0 0 auto;
  background: currentColor;
  clip-path: polygon(
    48% 0,
    55% 39%,
    100% 48%,
    55% 56%,
    48% 100%,
    40% 56%,
    0 48%,
    40% 39%
  );
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: 64px;
  border-bottom: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.94);
  backdrop-filter: blur(18px);
}

.header-inner {
  height: 100%;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  width: fit-content;
  font-size: 12px;
  letter-spacing: -0.03em;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 38px;
  color: rgba(255, 255, 255, 0.64);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.main-nav a {
  transition: color 150ms ease;
}

.main-nav a:hover {
  color: #fff;
}

.header-actions {
  display: flex;
  justify-content: flex-end;
}

.language-switcher {
  display: flex;
}

.language-switcher a {
  min-width: 58px;
  height: 28px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.54);
  color: rgba(255, 255, 255, 0.74);
  font-family: var(--mono);
  font-size: 8px;
}

.language-switcher a + a {
  border-left: 0;
}

.language-switcher a[aria-current="page"] {
  background: #fff;
  color: #000;
}

.hero-media {
  width: 100%;
  aspect-ratio: 1915 / 900;
  overflow: hidden;
  background: #05030a;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-copy {
  max-width: 700px;
  margin: 0 auto;
  padding: 76px 20px 148px;
  text-align: center;
}

.kicker,
.section-index,
.micro {
  color: var(--faint);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.hero-copy h1 {
  margin: 24px auto 22px;
  font-size: clamp(48px, 5vw, 72px);
  font-weight: 400;
  letter-spacing: -0.065em;
  line-height: 0.98;
}

.hero-copy h1 span,
.brand-panel-copy h2 span {
  display: block;
}

html[lang="zh-CN"] .hero-copy h1 {
  letter-spacing: -0.075em;
  line-height: 1.04;
}

.hero-dek {
  max-width: 540px;
  margin: 0 auto;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}

.hero-meta {
  max-width: 540px;
  display: flex;
  justify-content: center;
  gap: 22px;
  margin: 26px auto 0;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.chapter {
  padding-top: 144px;
}

.chapter-head {
  max-width: 750px;
  margin: 0 auto 60px;
  text-align: center;
}

.chapter-head h2 {
  margin: 20px auto 18px;
  font-size: clamp(38px, 4vw, 56px);
  font-weight: 400;
  letter-spacing: -0.06em;
  line-height: 1.02;
}

html[lang="zh-CN"] .chapter-head h2 {
  letter-spacing: -0.07em;
  line-height: 1.08;
}

.chapter-head p {
  max-width: 570px;
  margin: 0 auto;
  color: var(--muted);
}

.manifesto {
  max-width: 900px;
  margin: 0 auto;
  padding: 138px 0;
  text-align: center;
}

.manifesto p {
  margin: 0;
  font-size: clamp(42px, 5.2vw, 74px);
  letter-spacing: -0.065em;
  line-height: 1;
}

html[lang="zh-CN"] .manifesto p {
  letter-spacing: -0.075em;
  line-height: 1.08;
}

.manifesto em {
  color: var(--pink);
  font-style: normal;
}

.metric-grid {
  max-width: 920px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 0 auto;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.metric {
  min-height: 164px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 24px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #0b0b0b;
}

.metric strong {
  font-size: 30px;
  font-weight: 400;
  letter-spacing: -0.055em;
}

.metric span {
  color: var(--faint);
  font-family: var(--mono);
  font-size: 8px;
  line-height: 1.45;
  text-transform: uppercase;
}

.status-note {
  max-width: 920px;
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 28px;
  margin: 18px auto 0;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  color: var(--faint);
  font-size: 11px;
}

.status-note strong {
  color: var(--pink);
  font-family: var(--mono);
  font-size: 8px;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.prose {
  max-width: 610px;
  margin: 0 auto;
  color: rgba(247, 247, 244, 0.72);
}

.prose p {
  margin: 0 0 22px;
}

.prose .large {
  margin-bottom: 36px;
  color: #fff;
  font-size: 25px;
  letter-spacing: -0.035em;
  line-height: 1.25;
}

.prose.spaced {
  margin-top: 58px;
}

.question {
  max-width: 840px;
  margin: 76px auto 0;
  padding: 44px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.question strong {
  display: block;
  margin-bottom: 18px;
  color: var(--pink);
  font-family: var(--mono);
  font-size: 8px;
  font-weight: 400;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.question p {
  margin: 0;
  color: #fff;
  font-size: clamp(28px, 3vw, 42px);
  letter-spacing: -0.05em;
  line-height: 1.08;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.card {
  min-height: 225px;
  display: flex;
  flex-direction: column;
  padding: 28px 30px;
  background: var(--panel);
}

.card .micro {
  color: var(--pink);
}

.card strong {
  margin-top: auto;
  color: #fff;
  font-size: 24px;
  font-weight: 400;
  letter-spacing: -0.045em;
  line-height: 1.08;
}

.card p {
  max-width: 390px;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.brand-panel {
  min-height: 650px;
  display: grid;
  grid-template-columns: minmax(0, 0.46fr) minmax(0, 0.54fr);
  margin-top: 150px;
  border: 1px solid var(--line);
  background: #000;
  overflow: hidden;
}

.brand-panel-media {
  min-height: 650px;
  border-right: 1px solid var(--line);
}

.brand-panel-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.brand-panel-copy {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 58px 64px;
}

.brand-panel-copy .brand-star {
  width: 30px;
  height: 30px;
  margin-bottom: 68px;
}

.brand-panel-copy h2 {
  max-width: 560px;
  margin: 0;
  font-size: clamp(42px, 4.6vw, 66px);
  font-weight: 400;
  letter-spacing: -0.065em;
  line-height: 0.98;
}

html[lang="zh-CN"] .brand-panel-copy h2 {
  letter-spacing: -0.075em;
  line-height: 1.04;
}

.panel-bottom {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 22px;
  margin-top: auto;
}

.index-stack {
  padding-left: 10px;
  border-left: 1px solid rgba(255, 255, 255, 0.58);
  color: var(--faint);
  font-family: var(--mono);
  font-size: 8px;
  line-height: 1.7;
  white-space: pre-line;
}

.panel-bottom p {
  max-width: 430px;
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

.step-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.step {
  min-height: 260px;
  display: flex;
  flex-direction: column;
  padding: 25px 26px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #0c0c0c;
}

.step .micro {
  color: var(--pink);
}

.step strong {
  margin-top: auto;
  color: #fff;
  font-size: 22px;
  font-weight: 400;
  letter-spacing: -0.04em;
}

.step p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 11px;
}

.formula-stack {
  margin-top: 16px;
}

.formula {
  padding: 38px 42px;
  background: #f2f1ed;
  color: #000;
}

.formula + .formula {
  margin-top: 12px;
}

.formula code {
  display: block;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: clamp(14px, 1.7vw, 22px);
  white-space: nowrap;
}

.formula small {
  display: block;
  margin-top: 18px;
  color: rgba(0, 0, 0, 0.56);
  font-size: 9px;
}

.method-list {
  max-width: 900px;
  margin: 68px auto 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
  counter-reset: methods;
}

.method-list li {
  position: relative;
  min-height: 88px;
  padding: 24px 20px 24px 78px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  counter-increment: methods;
}

.method-list li::before {
  content: "0" counter(methods);
  position: absolute;
  top: 26px;
  left: 0;
  color: var(--pink);
  font-family: var(--mono);
  font-size: 8px;
}

.method-list strong {
  color: #fff;
  font-weight: 400;
}

.explorer {
  border: 1px solid var(--line);
  background: #050505;
}

.explorer-head {
  min-height: 104px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 28px 32px;
  border-bottom: 1px solid var(--line);
}

.explorer-head h3 {
  margin: 0;
  font-size: 28px;
  font-weight: 400;
  letter-spacing: -0.045em;
}

.tabs {
  display: flex;
  margin: 0;
  padding: 0;
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  list-style: none;
}

.tab {
  flex: 0 0 auto;
  min-width: 82px;
  height: 46px;
  border: 0;
  border-right: 1px solid var(--line);
  background: transparent;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 8px;
  cursor: pointer;
}

.tab:hover {
  color: #fff;
}

.tab[aria-selected="true"] {
  background: #fff;
  color: #000;
}

.explorer-stage {
  min-height: 540px;
  display: grid;
  grid-template-columns: minmax(280px, 0.34fr) minmax(0, 0.66fr);
}

.axis-copy {
  display: flex;
  flex-direction: column;
  padding: 48px;
  border-right: 1px solid var(--line);
}

.axis-copy .micro {
  color: var(--pink);
}

.axis-copy h4 {
  margin: auto 0 14px;
  font-size: clamp(38px, 4vw, 58px);
  font-weight: 400;
  letter-spacing: -0.06em;
  line-height: 1;
}

.axis-copy p {
  max-width: 350px;
  margin: 0 0 22px;
  color: var(--muted);
  font-size: 12px;
}

.axis-badge {
  width: fit-content;
  padding: 7px 9px;
  border: 1px solid var(--line);
  color: var(--faint);
  font-family: var(--mono);
  font-size: 8px;
}

.chart-side {
  padding: 48px;
}

.chart {
  position: relative;
  min-height: 370px;
}

.chart-grid {
  position: absolute;
  inset: 26px 38px 58px;
  background:
    linear-gradient(var(--line), var(--line)) 0 0 / 100% 1px no-repeat,
    linear-gradient(var(--line-strong), var(--line-strong)) 0 50% / 100% 1px no-repeat,
    linear-gradient(var(--line), var(--line)) 0 100% / 100% 1px no-repeat;
}

.chart-grid::before,
.chart-grid::after {
  position: absolute;
  left: -38px;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 8px;
}

.chart-grid::before {
  content: "+0.65";
  top: -7px;
}

.chart-grid::after {
  content: "−0.65";
  bottom: -7px;
}

.baseline {
  position: absolute;
  top: calc(50% - 16px);
  color: var(--faint);
  font-family: var(--mono);
  font-size: 8px;
}

.chart-line {
  position: absolute;
  z-index: 2;
  height: 1px;
  background: rgba(255, 255, 255, 0.58);
  transform-origin: left center;
  transition: 260ms ease;
}

.point {
  position: absolute;
  z-index: 3;
  width: 14px;
  height: 14px;
  border: 3px solid #050505;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 1px currentColor;
  transform: translate(-50%, -50%);
  transition: left 260ms ease, top 260ms ease;
}

.point.g {
  color: var(--pink);
}

.point.v3 {
  color: var(--violet);
}

.point.v35 {
  color: var(--aqua);
}

.point-label {
  position: absolute;
  z-index: 4;
  min-width: 90px;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 8px;
  text-align: center;
  bottom: 6px;
  transform: translateX(-50%);
  transition: left 260ms ease;
}

.point-label strong {
  display: block;
  margin-top: 4px;
  color: #fff;
  font-size: 17px;
  font-weight: 400;
}

.transition-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border: 1px solid var(--line);
  background: #101010;
}

.transition-row div {
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  border-right: 1px solid var(--line);
}

.transition-row div:last-child {
  border-right: 0;
}

.transition-row span,
.transition-row strong {
  font-family: var(--mono);
  font-size: 8px;
  font-weight: 400;
}

.transition-row span {
  color: var(--faint);
}

.results-wrap {
  margin-top: 16px;
  overflow-x: auto;
}

.results {
  width: 100%;
  min-width: 820px;
  border-collapse: collapse;
  background: #050505;
}

.results th,
.results td {
  padding: 16px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.results th {
  color: var(--faint);
  font-family: var(--mono);
  font-size: 8px;
  font-weight: 400;
  text-transform: uppercase;
}

.results td {
  color: rgba(255, 255, 255, 0.72);
  font-size: 11px;
}

.results .pass {
  color: var(--aqua);
}

.results .stable {
  color: #bcaaff;
}

.claim-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.claim {
  min-height: 230px;
  display: flex;
  flex-direction: column;
  padding: 28px 30px;
  background: var(--panel);
}

.claim-status {
  width: fit-content;
  padding: 5px 7px;
  background: #fff;
  color: #000;
  font-family: var(--mono);
  font-size: 8px;
  text-transform: uppercase;
}

.claim-status.open {
  border: 1px solid rgba(255, 255, 255, 0.46);
  background: transparent;
  color: var(--pink);
}

.claim strong {
  margin-top: auto;
  color: #fff;
  font-size: 22px;
  font-weight: 400;
  letter-spacing: -0.04em;
  line-height: 1.08;
}

.claim p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 11px;
}

.closing {
  max-width: 900px;
  margin: 0 auto;
  padding: 170px 0 180px;
  text-align: center;
}

.closing p {
  margin: 22px 0 0;
  font-size: clamp(42px, 5vw, 70px);
  letter-spacing: -0.065em;
  line-height: 1;
}

html[lang="zh-CN"] .closing p {
  letter-spacing: -0.075em;
  line-height: 1.08;
}

.references {
  max-width: 900px;
  margin: 0 auto 140px;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.references li {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  color: var(--faint);
  font-size: 10px;
}

.references a {
  color: var(--muted);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

.footer-inner {
  min-height: 260px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: start;
  padding: 34px 0;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 12px;
}

.footer-meta {
  display: flex;
  justify-content: flex-end;
  gap: 40px;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 8px;
  text-transform: uppercase;
}

.copyright {
  align-self: end;
  color: rgba(255, 255, 255, 0.28);
  font-family: var(--mono);
  font-size: 8px;
}

@media (max-width: 800px) {
  .shell {
    width: min(calc(100% - 32px), 1240px);
  }

  .header-inner {
    grid-template-columns: 1fr auto;
  }

  .main-nav {
    display: none;
  }

  .site-header {
    height: 58px;
  }

  .language-switcher a {
    min-width: 46px;
    height: 26px;
  }

  .hero-media {
    aspect-ratio: 0.86;
  }

  .hero-media img {
    object-position: center;
  }

  .hero-copy {
    padding: 64px 18px 110px;
  }

  .hero-copy h1 {
    font-size: 47px;
  }

  html[lang="zh-CN"] .hero-copy h1 {
    font-size: 44px;
  }

  .hero-meta {
    flex-wrap: wrap;
    gap: 8px 18px;
  }

  .chapter {
    padding-top: 110px;
  }

  .manifesto {
    padding: 105px 0;
  }

  .manifesto p {
    font-size: 44px;
  }

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

  .metric {
    min-height: 140px;
  }

  .status-note {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .chapter-head {
    margin-bottom: 48px;
  }

  .chapter-head h2 {
    font-size: 40px;
  }

  .card-grid,
  .claim-list {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .brand-panel {
    grid-template-columns: 1fr;
    margin-right: -16px;
    margin-left: -16px;
    border-right: 0;
    border-left: 0;
  }

  .brand-panel-media {
    min-height: 72vh;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .brand-panel-copy {
    min-height: 560px;
    padding: 42px 22px;
  }

  .brand-panel-copy h2 {
    font-size: 45px;
  }

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

  .step {
    min-height: 210px;
  }

  .formula {
    margin-right: -16px;
    margin-left: -16px;
    padding: 30px 22px;
  }

  .method-list li {
    padding-left: 48px;
  }

  .explorer {
    margin-right: -16px;
    margin-left: -16px;
    border-right: 0;
    border-left: 0;
  }

  .explorer-head {
    min-height: 92px;
    padding: 24px 20px;
  }

  .explorer-head .micro {
    display: none;
  }

  .explorer-stage {
    grid-template-columns: 1fr;
  }

  .axis-copy {
    min-height: 340px;
    padding: 34px 22px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .axis-copy h4 {
    font-size: 44px;
  }

  .chart-side {
    padding: 30px 20px;
  }

  .chart {
    min-height: 360px;
  }

  .results-wrap {
    margin-right: -16px;
    margin-left: -16px;
  }

  .closing {
    padding: 130px 0 140px;
  }

  .closing p {
    font-size: 44px;
  }

  .footer-inner {
    min-height: 230px;
    grid-template-columns: 1fr;
    gap: 60px;
  }

  .footer-meta {
    justify-content: flex-start;
  }
}

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

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