:root {
  color-scheme: light;
  --ink: #161816;
  --ink-soft: #3f4440;
  --muted: #666c67;
  --paper: #f7f7f5;
  --white: #ffffff;
  --line: #d6dad6;
  --line-dark: #343b37;
  --red: #c2332d;
  --red-dark: #9e2924;
  --green: #1f6b4f;
  --blue: #245a87;
  --yellow: #f1c84b;
  --dark: #171a18;
  --dark-green: #1d2a25;
  --shell: 1160px;
  --header-height: 68px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 20px);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
}

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

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

button,
input,
select,
textarea {
  font: inherit;
  letter-spacing: 0;
}

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

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 8px;
  left: 8px;
  padding: 10px 14px;
  color: var(--white);
  background: var(--ink);
  border-radius: 4px;
  transform: translateY(-150%);
}

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

.section-shell,
.nav-shell,
.hero-inner {
  width: min(calc(100% - 48px), var(--shell));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  height: var(--header-height);
  background: rgba(247, 247, 245, 0.96);
  border-bottom: 1px solid rgba(22, 24, 22, 0.12);
  backdrop-filter: blur(12px);
}

.nav-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  color: var(--ink);
  font-size: 15px;
  font-weight: 760;
  white-space: nowrap;
}

.brand-mark {
  display: grid;
  flex: 0 0 34px;
  width: 34px;
  height: 34px;
  place-items: center;
  color: var(--white);
  background: var(--red);
  border-radius: 4px;
  font-family: "Songti SC", SimSun, serif;
  font-size: 19px;
  font-weight: 700;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 650;
}

.nav-links > a:not(.repo-link) {
  padding: 8px 0;
  border-bottom: 2px solid transparent;
}

.nav-links > a:not(.repo-link):hover,
.nav-links > a:not(.repo-link):focus-visible {
  color: var(--red);
  border-color: var(--red);
}

.repo-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 38px;
  padding: 0 14px;
  color: var(--white);
  background: var(--ink);
  border-radius: 4px;
}

.repo-link img,
.button img {
  filter: brightness(0) invert(1);
}

.hero {
  position: relative;
  display: flex;
  overflow: hidden;
  height: calc(100svh - 48px);
  min-height: 620px;
  max-height: 760px;
  align-items: center;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  isolation: isolate;
}

.hero::before {
  position: absolute;
  z-index: -1;
  inset: 0;
  background: url("assets/hero-decision-map.png") center center / cover no-repeat;
  content: "";
}

.hero-inner {
  padding-bottom: 32px;
}

.source-line {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 24px;
  color: var(--red-dark);
  font-size: 14px;
  font-weight: 760;
}

.source-line span {
  padding-left: 10px;
  color: var(--muted);
  border-left: 1px solid var(--line);
  font-weight: 600;
}

.hero h1 {
  max-width: 720px;
  margin: 0;
  color: var(--ink);
  font-family: Georgia, "Songti SC", SimSun, serif;
  font-size: 64px;
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: 0;
}

.hero-kicker {
  max-width: 650px;
  margin: 24px 0 0;
  color: var(--ink);
  font-size: 24px;
  font-weight: 720;
  line-height: 1.45;
}

.hero-copy {
  max-width: 620px;
  margin: 14px 0 0;
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 4px;
  font-size: 15px;
  font-weight: 740;
  line-height: 1;
  transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease, transform 160ms ease;
}

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

.button-primary {
  color: var(--white);
  background: var(--red);
  border-color: var(--red);
}

.button-primary:hover,
.button-primary:focus-visible {
  background: var(--red-dark);
  border-color: var(--red-dark);
}

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

.button-secondary img {
  filter: none;
}

.button-secondary:hover,
.button-secondary:focus-visible {
  color: var(--white);
  background: var(--ink);
}

.button-secondary:hover img,
.button-secondary:focus-visible img {
  filter: brightness(0) invert(1);
}

.hero-proof {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  max-width: 700px;
  margin: 34px 0 0;
}

.hero-proof div {
  min-width: 120px;
  padding: 0 22px;
  border-left: 1px solid var(--line);
}

.hero-proof div:first-child {
  padding-left: 0;
  border-left: 0;
}

.hero-proof dt {
  color: var(--ink);
  font-family: Georgia, "Songti SC", SimSun, serif;
  font-size: 25px;
  font-weight: 700;
  line-height: 1.1;
}

.hero-proof dd {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
}

.next-hint {
  position: absolute;
  right: 32px;
  bottom: 20px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
}

.next-hint:hover,
.next-hint:focus-visible {
  color: var(--red);
}

.proof-band {
  color: var(--white);
  background: var(--ink);
}

.proof-row {
  display: grid;
  min-height: 72px;
  grid-template-columns: 1.15fr repeat(3, 1fr) 1.15fr;
  align-items: center;
  text-align: center;
}

.proof-row span,
.proof-row strong {
  padding: 9px 16px;
  border-left: 1px solid var(--line-dark);
  font-size: 13px;
}

.proof-row > :first-child {
  border-left: 0;
}

.proof-row span {
  color: #b9c0bb;
  font-weight: 550;
}

.proof-row strong {
  color: var(--white);
  font-weight: 720;
}

.section {
  padding: 108px 0;
}

.section-heading {
  max-width: 800px;
  margin-bottom: 48px;
}

.section-heading.compact-heading {
  margin-bottom: 38px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--red);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.section-heading h2,
.closing-band h2 {
  margin: 0;
  font-family: Georgia, "Songti SC", SimSun, serif;
  font-size: 42px;
  font-weight: 700;
  line-height: 1.26;
  letter-spacing: 0;
}

.section-heading > p:last-child {
  max-width: 720px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 17px;
}

.example-section {
  background: var(--white);
}

.case-question {
  max-width: 920px;
  margin: 0 0 34px;
  padding: 18px 0 18px 24px;
  color: var(--ink);
  border-left: 4px solid var(--red);
  font-family: Georgia, "Songti SC", SimSun, serif;
  font-size: 22px;
  font-weight: 650;
  line-height: 1.6;
}

.product-preview {
  margin: 0;
}

.product-preview img {
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  box-shadow: 0 24px 70px rgba(22, 24, 22, 0.12);
}

.product-preview figcaption {
  margin-top: 14px;
  color: var(--muted);
  font-size: 13px;
}

.method-section {
  color: var(--white);
  background: var(--dark);
}

.light-heading h2 {
  color: var(--white);
}

.light-heading > p:last-child {
  color: #b8c0ba;
}

.method-section .eyebrow,
.install-section .eyebrow {
  color: var(--yellow);
}

.reasoning-flow {
  display: grid;
  margin: 12px 0 64px;
  padding: 0;
  grid-template-columns: repeat(5, 1fr);
  list-style: none;
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}

.reasoning-flow li {
  position: relative;
  min-height: 178px;
  padding: 26px 20px;
  border-left: 1px solid var(--line-dark);
}

.reasoning-flow li:first-child {
  border-left: 0;
}

.reasoning-flow span {
  display: block;
  margin-bottom: 20px;
  color: var(--yellow);
  font-size: 12px;
  font-weight: 800;
}

.reasoning-flow strong {
  display: block;
  color: var(--white);
  font-family: Georgia, "Songti SC", SimSun, serif;
  font-size: 25px;
}

.reasoning-flow small {
  display: block;
  margin-top: 9px;
  color: #aab2ac;
  font-size: 13px;
  line-height: 1.55;
}

.translation-grid {
  display: grid;
  margin-bottom: 30px;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}

.translation-grid > div {
  min-height: 130px;
  padding: 26px 28px;
  border-left: 1px solid var(--line-dark);
}

.translation-grid > div:first-child {
  border-left: 0;
}

.translation-grid p {
  margin: 0 0 8px;
  color: #9fa8a2;
  font-size: 13px;
}

.translation-grid strong {
  display: block;
  color: var(--white);
  font-size: 16px;
  line-height: 1.7;
}

.text-link {
  display: inline-block;
  padding: 7px 0 5px;
  color: var(--red-dark);
  border-bottom: 1px solid currentColor;
  font-size: 14px;
  font-weight: 740;
}

.text-link:hover,
.text-link:focus-visible {
  color: var(--blue);
}

.light-link {
  color: var(--yellow);
}

.light-link:hover,
.light-link:focus-visible {
  color: var(--white);
}

.difference-section {
  background: #f0f2ef;
}

.comparison-table {
  border-top: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
}

.comparison-row {
  display: grid;
  min-height: 72px;
  grid-template-columns: 1fr 1.25fr;
  align-items: center;
  border-top: 1px solid #cbd0cb;
}

.comparison-row:first-child {
  border-top: 0;
}

.comparison-row > span,
.comparison-row > strong {
  padding: 18px 24px;
}

.comparison-row > strong {
  color: var(--green);
  border-left: 1px solid #cbd0cb;
  font-weight: 720;
}

.comparison-head {
  min-height: 52px;
  color: var(--white);
  background: var(--ink);
  font-size: 13px;
  font-weight: 740;
}

.comparison-head > span:nth-child(2) {
  border-left: 1px solid var(--line-dark);
}

.scenarios-section {
  background: var(--white);
}

.scenario-columns {
  display: grid;
  margin-bottom: 38px;
  grid-template-columns: repeat(4, 1fr);
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--line);
}

.scenario-columns > div {
  padding: 28px 26px 32px;
  border-left: 1px solid var(--line);
}

.scenario-columns > div:first-child {
  border-left: 0;
}

.scenario-columns h3 {
  margin: 0 0 20px;
  color: var(--ink);
  font-family: Georgia, "Songti SC", SimSun, serif;
  font-size: 22px;
}

.scenario-columns p {
  margin: 0;
  padding: 9px 0;
  color: var(--ink-soft);
  border-top: 1px solid #e8eae7;
  font-size: 14px;
}

.scenario-columns a {
  display: block;
  color: var(--red-dark);
  font-weight: 720;
}

.scenario-columns a:hover,
.scenario-columns a:focus-visible {
  color: var(--blue);
}

.scenario-footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 28px;
}

.install-section {
  color: var(--white);
  background: var(--dark-green);
}

.install-shell {
  max-width: 1060px;
}

.install-tool {
  overflow: hidden;
  border: 1px solid #52615a;
  border-radius: 6px;
  background: #15201b;
}

.segmented-control {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: #22312b;
  border-bottom: 1px solid #52615a;
}

.segmented-control button {
  min-height: 52px;
  padding: 0 14px;
  color: #bbc5bf;
  background: transparent;
  border: 0;
  border-left: 1px solid #52615a;
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
}

.segmented-control button:first-child {
  border-left: 0;
}

.segmented-control button[aria-selected="true"] {
  color: var(--dark);
  background: var(--yellow);
}

.segmented-control button:focus-visible {
  outline: 2px solid var(--white);
  outline-offset: -4px;
}

.install-panels {
  min-height: 190px;
}

.install-panel {
  padding: 32px;
}

.install-panel > p {
  margin: 0 0 18px;
  color: #b9c4bd;
  font-size: 14px;
}

.code-line {
  display: grid;
  overflow: hidden;
  min-height: 82px;
  grid-template-columns: minmax(0, 1fr) 54px;
  align-items: stretch;
  color: #eff5f1;
  background: #0e1512;
  border: 1px solid #3f4d46;
  border-radius: 4px;
}

.code-line code {
  display: flex;
  overflow-x: auto;
  align-items: center;
  padding: 18px 20px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 13px;
  line-height: 1.55;
  white-space: nowrap;
  scrollbar-color: #63756b transparent;
}

.copy-button {
  display: grid;
  width: 54px;
  min-width: 54px;
  height: 100%;
  min-height: 54px;
  place-items: center;
  color: var(--white);
  background: #26362f;
  border: 0;
  border-left: 1px solid #3f4d46;
  cursor: pointer;
}

.copy-button:hover,
.copy-button:focus-visible {
  background: var(--green);
}

.copy-button img {
  width: 20px;
  height: 20px;
  filter: brightness(0) invert(1);
}

.install-note {
  margin: 22px 0 0;
  color: #b9c4bd;
  font-size: 13px;
}

.install-note code {
  color: var(--yellow);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

.faq-section {
  background: var(--paper);
}

.faq-shell {
  display: grid;
  grid-template-columns: minmax(260px, 0.75fr) minmax(0, 1.5fr);
  gap: 80px;
}

.faq-list {
  border-top: 2px solid var(--ink);
}

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

.faq-list summary {
  position: relative;
  padding: 22px 50px 22px 0;
  cursor: pointer;
  font-size: 17px;
  font-weight: 720;
  list-style: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  position: absolute;
  top: 50%;
  right: 4px;
  width: 26px;
  height: 26px;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 50%;
  content: "+";
  font-size: 18px;
  font-weight: 500;
  line-height: 23px;
  text-align: center;
  transform: translateY(-50%);
}

.faq-list details[open] summary::after {
  content: "−";
}

.faq-list details p {
  max-width: 760px;
  margin: -4px 0 24px;
  padding-right: 44px;
  color: var(--muted);
  font-size: 15px;
}

.closing-band {
  padding: 70px 0;
  color: var(--white);
  background: var(--red);
}

.closing-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.closing-band .eyebrow {
  color: #ffd99d;
}

.closing-band h2 {
  max-width: 680px;
  font-size: 34px;
}

.closing-actions {
  display: flex;
  flex: 0 0 auto;
  gap: 10px;
}

.closing-band .button-primary {
  color: var(--ink);
  background: var(--yellow);
  border-color: var(--yellow);
}

.closing-band .button-primary:hover,
.closing-band .button-primary:focus-visible {
  background: #f5d66e;
  border-color: #f5d66e;
}

.dark-secondary {
  color: var(--white);
  background: transparent;
  border-color: rgba(255, 255, 255, 0.72);
}

.dark-secondary:hover,
.dark-secondary:focus-visible {
  color: var(--ink);
  background: var(--white);
}

.site-footer {
  padding: 46px 0;
  color: #d0d6d2;
  background: var(--ink);
}

.footer-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 40px;
}

.footer-inner strong {
  color: var(--white);
  font-size: 15px;
}

.footer-inner p {
  margin: 7px 0 0;
  color: #929b95;
  font-size: 13px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 24px;
  font-size: 13px;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--yellow);
}

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

@media (max-width: 980px) {
  .nav-links {
    gap: 18px;
  }

  .hero::before {
    opacity: 0.58;
    background-position: 58% center;
  }

  .hero h1 {
    font-size: 54px;
  }

  .reasoning-flow {
    grid-template-columns: repeat(5, minmax(150px, 1fr));
    overflow-x: auto;
  }

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

  .scenario-columns > div:nth-child(3) {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .scenario-columns > div:nth-child(4) {
    border-top: 1px solid var(--line);
  }

  .faq-shell {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .closing-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 760px) {
  :root {
    --header-height: 62px;
  }

  .section-shell,
  .nav-shell,
  .hero-inner {
    width: min(calc(100% - 32px), var(--shell));
  }

  .brand {
    font-size: 13px;
  }

  .brand-mark {
    flex-basis: 32px;
    width: 32px;
    height: 32px;
    font-size: 17px;
  }

  .nav-links > a:not(.repo-link) {
    display: none;
  }

  .repo-link {
    min-height: 36px;
    padding: 0 12px;
    font-size: 13px;
  }

  .hero {
    height: calc(100svh - var(--header-height) - 24px);
    min-height: 480px;
    max-height: 700px;
  }

  .hero::before {
    opacity: 0.25;
    background-position: 62% center;
  }

  .hero-inner {
    padding-bottom: 18px;
  }

  .source-line {
    margin-bottom: 17px;
    font-size: 12px;
  }

  .hero h1 {
    font-size: 42px;
  }

  .hero-kicker {
    margin-top: 18px;
    font-size: 20px;
  }

  .hero-copy {
    max-width: 510px;
    margin-top: 10px;
    font-size: 15px;
    line-height: 1.7;
  }

  .hero-actions {
    margin-top: 20px;
  }

  .button {
    min-height: 44px;
    padding: 0 17px;
    font-size: 14px;
  }

  .hero-proof {
    display: grid;
    margin-top: 26px;
    grid-template-columns: repeat(4, 1fr);
  }

  .hero-proof div {
    min-width: 0;
    padding: 0 9px;
  }

  .hero-proof dt {
    font-size: 19px;
  }

  .hero-proof dd {
    font-size: 10px;
  }

  .next-hint {
    right: 16px;
    bottom: 13px;
    font-size: 11px;
  }

  .proof-row {
    min-height: 66px;
    grid-template-columns: repeat(3, 1fr);
  }

  .proof-row span {
    display: none;
  }

  .proof-row strong {
    padding: 8px;
    font-size: 12px;
  }

  .proof-row strong:first-of-type {
    border-left: 0;
  }

  .section {
    padding: 78px 0;
  }

  .section-heading {
    margin-bottom: 34px;
  }

  .section-heading h2,
  .closing-band h2 {
    font-size: 32px;
  }

  .section-heading > p:last-child {
    margin-top: 14px;
    font-size: 15px;
  }

  .case-question {
    margin-bottom: 26px;
    padding: 14px 0 14px 18px;
    font-size: 18px;
  }

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

  .translation-grid > div {
    min-height: 0;
    padding: 22px 0;
    border-top: 1px solid var(--line-dark);
    border-left: 0;
  }

  .translation-grid > div:first-child {
    border-top: 0;
  }

  .comparison-row {
    min-height: 0;
    grid-template-columns: 0.85fr 1.15fr;
  }

  .comparison-row > span,
  .comparison-row > strong {
    padding: 15px 12px;
    font-size: 13px;
    line-height: 1.55;
  }

  .scenario-columns > div {
    padding: 24px 18px;
  }

  .scenario-columns h3 {
    font-size: 19px;
  }

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

  .segmented-control button:nth-child(3),
  .segmented-control button:nth-child(4) {
    border-top: 1px solid #52615a;
  }

  .segmented-control button:nth-child(3) {
    border-left: 0;
  }

  .install-panels {
    min-height: 230px;
  }

  .install-panel {
    padding: 24px 18px;
  }

  .code-line code {
    padding: 16px;
    font-size: 12px;
  }

  .closing-band {
    padding: 58px 0;
  }

  .closing-actions {
    width: 100%;
    flex-wrap: wrap;
  }

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

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

@media (max-width: 480px) {
  .brand span:last-child {
    overflow: hidden;
    max-width: 180px;
    text-overflow: ellipsis;
  }

  .repo-link span {
    display: none;
  }

  .repo-link {
    width: 38px;
    padding: 0;
  }

  .hero {
    min-height: 480px;
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero-kicker {
    font-size: 18px;
  }

  .hero-copy {
    font-size: 14px;
  }

  .hero-proof div {
    padding: 0 6px;
  }

  .hero-proof dt {
    font-size: 17px;
  }

  .hero-proof dd {
    max-width: 58px;
    line-height: 1.3;
  }

  .section-heading h2,
  .closing-band h2 {
    font-size: 28px;
  }

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

  .scenario-columns > div {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .scenario-columns > div:first-child {
    border-top: 0;
  }

  .scenario-columns > div:nth-child(4) {
    border-left: 0;
  }

  .comparison-row {
    grid-template-columns: 1fr;
  }

  .comparison-row > strong,
  .comparison-head > span:nth-child(2) {
    border-top: 1px solid #cbd0cb;
    border-left: 0;
  }

  .comparison-head > span:nth-child(2) {
    border-top-color: var(--line-dark);
  }

  .footer-links {
    gap: 16px;
  }
}

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

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