:root {
  --canvas: #fff;
  --ink: #202222;
  --muted: #606968;
  --line: #dce0df;
  --stage: #deebf1;
  --action: #245b47;
  font-family:
    "Avenir Next", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--canvas);
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
}
a {
  color: inherit;
  text-decoration: none;
}
button,
input,
select {
  font: inherit;
}
button,
a,
select,
input {
  -webkit-tap-highlight-color: transparent;
}
button,
select {
  cursor: pointer;
}
button {
  color: inherit;
}
a:hover {
  text-decoration: underline;
  text-underline-offset: 5px;
}
button:disabled {
  cursor: default;
}
img {
  display: block;
  max-width: 100%;
  height: auto;
}
h1,
h2,
h3,
h4,
p {
  margin: 0;
}
h1,
h2 {
  font-weight: 500;
  letter-spacing: -0.055em;
  text-wrap: balance;
}
p {
  line-height: 1.65;
}
h2 {
  font-size: clamp(34px, 4.5vw, 62px);
  line-height: 1.12;
}
h3 {
  font-size: 22px;
  line-height: 1.3;
  font-weight: 550;
  letter-spacing: -0.025em;
}
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--action);
  outline-offset: 5px;
}
section[id],
main[id],
.demo-panel {
  scroll-margin-top: 90px;
}
[hidden] {
  display: none !important;
}
.wrap {
  width: calc(100% - 112px);
  max-width: 1328px;
  margin-inline: auto;
}
.skip {
  position: fixed;
  top: -100px;
  left: 12px;
  z-index: 10;
  background: #fff;
  padding: 12px;
}
.skip:focus {
  top: 10px;
}
.header {
  height: 86px;
  padding: 0 42px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #edf0ef;
  background: rgba(255, 255, 255, 0.96);
  position: sticky;
  top: 0;
  z-index: 5;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 21px;
  font-weight: 600;
  letter-spacing: -0.045em;
  white-space: nowrap;
}
.brand img {
  border-radius: 8px;
}
.header nav {
  display: flex;
  align-items: center;
  gap: 30px;
  font-size: 14px;
  font-weight: 500;
}
.nav-download {
  padding: 10px 19px;
  background: var(--ink);
  color: #fff;
  border-radius: 24px;
}
.hero {
  padding-block: 102px 76px;
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 60px;
  align-items: start;
}
.hero h1 {
  font-size: clamp(54px, 6.3vw, 92px);
  line-height: 1.04;
}
.hero-copy {
  padding-top: 5px;
  max-width: 365px;
  justify-self: end;
}
.hero-copy .intro {
  font-size: 20px;
  color: var(--ink);
  line-height: 1.4;
  margin-bottom: 14px;
}
.hero-copy > p {
  font-size: 17px;
  color: var(--muted);
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 22px;
  min-height: 45px;
  padding: 12px 21px;
  border: 1px solid var(--ink);
  border-radius: 28px;
  font-size: 14px;
  font-weight: 550;
  background: #fff;
  line-height: 1.2;
  white-space: nowrap;
}
.button:hover {
  background: #edf2ef;
  text-decoration: none;
}
.button.primary {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}
.button.primary:hover {
  background: var(--action);
  border-color: var(--action);
}
.hero .primary {
  margin-top: 25px;
}
.text-link {
  font-size: 15px;
  font-weight: 500;
  display: inline-block;
  line-height: 1.5;
}
.hero .text-link {
  display: block;
  margin-top: 18px;
}
.hero small {
  display: block;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
  margin-top: 20px;
}
.showcase-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: center;
  margin-bottom: 20px;
}
.tabs {
  display: flex;
  gap: 5px;
  background: #f1f3f2;
  border-radius: 30px;
  padding: 5px;
}
.tab {
  display: block;
  min-height: 40px;
  padding: 10px 22px;
  border-radius: 25px;
  font-size: 14px;
  line-height: 20px;
  white-space: nowrap;
}
.tab[aria-selected="true"] {
  background: #fff;
  box-shadow: 0 1px 4px #00000012;
}
.tab:hover {
  text-decoration: none;
  background: #ffffffa0;
}
.sample {
  font-size: 12px;
  color: var(--muted);
}
.demo-panel + .demo-panel {
  margin-top: 30px;
}
.enhanced .demo-panel + .demo-panel {
  margin-top: 0;
}
.overview {
  padding-block: 130px 120px;
}
.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 60px;
}
.section-heading > p {
  max-width: 350px;
  font-size: 17px;
  color: var(--muted);
}
.feature-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 65px;
  margin-top: 60px;
}
.feature-columns article {
  border-top: 1px solid var(--line);
  padding-top: 25px;
}
.feature-columns p {
  font-size: 15px;
  color: var(--muted);
  margin-top: 16px;
}
.mobile-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 90px;
  align-items: center;
  padding-bottom: 120px;
}
.mobile-art {
  background: #e9eee7;
  border-radius: 20px;
  padding: 46px 30px 23px;
  display: flex;
  align-items: center;
  flex-direction: column;
  max-height: 650px;
  overflow: hidden;
}
.phone {
  width: 246px;
  border: 7px solid #202222;
  border-radius: 37px;
  overflow: hidden;
  box-shadow: 0 18px 35px #233e2826;
}
.phone img {
  width: 100%;
}
.mobile-art > p {
  font-size: 11px;
  color: var(--muted);
  margin-top: 20px;
}
.mobile-copy {
  max-width: 400px;
}
.mobile-copy > p {
  font-size: 17px;
  color: var(--muted);
  margin-top: 28px;
}
.mobile-copy ul {
  list-style: none;
  padding: 0;
  margin: 25px 0 30px;
  font-size: 15px;
}
.mobile-copy li {
  margin-top: 14px;
  padding-left: 24px;
  position: relative;
}
.mobile-copy li:before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--action);
}
.download-section {
  padding-block: 95px;
  background: #f4f6f5;
}
.download-source {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin: 42px 0 22px;
  font-size: 13px;
}
.download-source label {
  font-weight: 550;
}
.download-source select {
  padding: 9px 35px 9px 12px;
  border: 1px solid #c6cfca;
  border-radius: 8px;
  background: #fff;
  max-width: 100%;
}
.download-source p {
  flex-basis: 100%;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}
.downloads {
  border-top: 1px solid #cdd4d0;
}
.download-row {
  padding: 28px 0;
  border-bottom: 1px solid #cdd4d0;
  display: grid;
  grid-template-columns: 1fr 1.1fr 1.5fr;
  gap: 30px;
  align-items: center;
}
.platform {
  display: flex;
  align-items: center;
  gap: 17px;
}
.platform h3 {
  font-size: 24px;
}
.architecture strong {
  font-size: 14px;
  font-weight: 550;
  display: block;
}
.architecture span {
  font-size: 12px;
  display: block;
  margin-top: 4px;
  color: var(--muted);
}
.download-actions {
  display: flex;
  justify-content: end;
  gap: 12px;
  flex-wrap: wrap;
}
.download-link {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
}
.fallback {
  font-size: 11px;
  text-decoration: underline;
}
.release-link {
  margin-top: 27px;
}
.linux-help {
  margin-top: 25px;
  border-top: 1px solid var(--line);
  padding-top: 18px;
  max-width: 750px;
  font-size: 13px;
}
.linux-help pre {
  overflow-x: auto;
  background: #e8edea;
  border-radius: 6px;
  padding: 16px;
  font-size: 13px;
  line-height: 1.8;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.linux-help p {
  color: var(--muted);
  font-size: 13px;
}
.getting-started {
  padding-block: 110px;
}
.getting-started h2 {
  font-size: 44px;
}
.getting-started ol {
  list-style: none;
  counter-reset: step;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 65px;
  margin: 48px 0 0;
  padding: 0;
}
.getting-started li {
  counter-increment: step;
}
.getting-started li:before {
  content: counter(step);
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid #c8cfcb;
  border-radius: 50%;
  font-size: 14px;
  margin-bottom: 24px;
}
.getting-started p {
  font-size: 15px;
  color: var(--muted);
  margin-top: 15px;
}
.faq {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 65px;
  padding-block: 30px 110px;
}
.faq h2 {
  font-size: 44px;
  max-width: 350px;
}
.faq details {
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}
.faq details:first-child {
  border-top: 1px solid var(--line);
}
summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  font-size: 16px;
  line-height: 1.5;
}
summary::-webkit-details-marker {
  display: none;
}
summary span {
  font-size: 22px;
  font-weight: 400;
}
details[open] > summary span {
  transform: rotate(45deg);
}
.faq details p {
  font-size: 14px;
  color: var(--muted);
  padding-top: 17px;
  max-width: 590px;
}
.closing {
  background: var(--stage);
  padding: 66px;
  border-radius: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 35px;
}
.closing h2 {
  font-size: 48px;
}
footer {
  padding-block: 70px 32px;
}
.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}
.footer-top > div {
  display: flex;
  gap: 25px;
  font-size: 13px;
}
footer > p {
  font-size: 11px;
  color: var(--muted);
  margin-top: 26px;
}
html[lang="zh-CN"] h1,
html[lang="zh-CN"] h2 {
  letter-spacing: -0.055em;
  line-height: 1.25;
}
html[lang="zh-CN"] .hero h1 {
  font-size: clamp(46px, 5.6vw, 80px);
}
html[lang="zh-CN"] .hero-copy .intro {
  font-size: 19px;
}
@media (min-width: 1600px) {
  .hero {
    padding-top: 115px;
  }
}
@media (max-width: 1050px) {
  .wrap {
    width: calc(100% - 64px);
  }
  .header {
    padding-inline: 28px;
  }
  .hero {
    gap: 32px;
    padding-block: 70px 55px;
    grid-template-columns: 1.3fr 1fr;
  }
  .hero h1 {
    font-size: 60px;
  }
  .hero-copy .intro {
    font-size: 18px;
  }
  .hero-copy > p {
    font-size: 15px;
  }
  .sample {
    display: none;
  }
  .feature-columns,
  .getting-started ol {
    gap: 30px;
  }
  .mobile-section {
    gap: 45px;
  }
  .section-heading {
    gap: 35px;
  }
  .section-heading > p {
    max-width: 280px;
  }
  .download-row {
    gap: 20px;
    grid-template-columns: 0.8fr 1fr 1.3fr;
  }
  .architecture span {
    max-width: 180px;
  }
  .faq {
    gap: 35px;
  }
  .closing {
    padding: 45px;
  }
  .closing h2 {
    font-size: 40px;
  }
}
@media (max-width: 740px) {
  .wrap {
    width: calc(100% - 40px);
  }
  .header {
    height: 70px;
    padding-inline: 20px;
  }
  .brand {
    font-size: 19px;
    gap: 8px;
  }
  .brand img {
    width: 28px;
  }
  .header nav {
    gap: 17px;
    font-size: 13px;
  }
  .nav-explore,
  .nav-mobile {
    display: none;
  }
  .nav-download {
    padding: 9px 15px;
  }
  .hero {
    display: block;
    padding-block: 58px 40px;
  }
  .hero h1,
  html[lang="zh-CN"] .hero h1 {
    font-size: clamp(43px, 8.8vw, 65px);
  }
  .hero-copy {
    margin-top: 25px;
    max-width: 440px;
  }
  .hero-copy .intro {
    font-size: 18px;
  }
  .hero-copy > p {
    font-size: 16px;
  }
  .hero .primary {
    margin-top: 22px;
  }
  .hero .text-link {
    display: inline-block;
    margin: 0 0 0 18px;
    font-size: 13px;
  }
  .hero small {
    margin-top: 16px;
  }
  .showcase-toolbar {
    margin-bottom: 15px;
  }
  .tabs {
    width: 100%;
    gap: 2px;
    justify-content: space-between;
  }
  .tab {
    padding: 9px 12px;
    font-size: 12px;
    text-align: center;
    flex: 1;
  }
  .overview {
    padding-block: 74px 64px;
  }
  .section-heading {
    display: block;
  }
  .section-heading > p {
    max-width: 400px;
    margin-top: 23px;
    font-size: 16px;
  }
  h2 {
    font-size: 36px;
  }
  .feature-columns {
    display: block;
    margin-top: 33px;
  }
  .feature-columns article {
    padding-top: 22px;
    margin-top: 26px;
  }
  .feature-columns h3 {
    font-size: 21px;
  }
  .feature-columns p {
    margin-top: 10px;
    max-width: 480px;
  }
  .mobile-section {
    display: flex;
    flex-direction: column-reverse;
    gap: 30px;
    padding-bottom: 65px;
    align-items: stretch;
  }
  .mobile-copy {
    max-width: none;
  }
  .mobile-copy > p {
    font-size: 16px;
    margin-top: 22px;
  }
  .mobile-copy ul {
    font-size: 14px;
  }
  .mobile-art {
    max-height: 525px;
    padding-top: 32px;
    border-radius: 12px;
  }
  .phone {
    width: 212px;
    border-width: 6px;
    border-radius: 31px;
  }
  .mobile-art > p {
    margin-top: 16px;
  }
  .download-section {
    padding-block: 65px;
  }
  .download-source {
    margin-top: 30px;
  }
  .download-row {
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    padding-block: 24px;
  }
  .platform {
    gap: 12px;
  }
  .platform h3 {
    font-size: 23px;
  }
  .architecture strong {
    font-size: 13px;
  }
  .architecture span {
    font-size: 11px;
  }
  .download-actions {
    grid-column: 1/-1;
    justify-content: start;
  }
  .download-actions .button {
    min-width: 125px;
  }
  .getting-started {
    padding-block: 65px;
  }
  .getting-started h2,
  .faq h2 {
    font-size: 34px;
  }
  .getting-started ol {
    display: block;
    margin-top: 35px;
  }
  .getting-started li {
    position: relative;
    padding-left: 50px;
    margin-top: 30px;
  }
  .getting-started li:before {
    position: absolute;
    left: 0;
    top: 0;
  }
  .getting-started h3 {
    font-size: 21px;
  }
  .getting-started p {
    margin-top: 10px;
  }
  .faq {
    display: block;
    padding-block: 10px 65px;
  }
  .faq > div {
    margin-top: 28px;
  }
  .faq details {
    padding-block: 20px;
  }
  .faq summary {
    font-size: 15px;
  }
  .closing {
    display: block;
    padding: 35px 26px;
    border-radius: 12px;
  }
  .closing h2 {
    font-size: 34px;
  }
  .closing .button {
    margin-top: 28px;
  }
  .footer-top {
    align-items: start;
    flex-direction: column;
    gap: 25px;
  }
  .footer-top > div {
    flex-wrap: wrap;
    gap: 20px;
  }
  footer {
    padding-block: 45px 25px;
  }
}
@media (max-width: 380px) {
  .header {
    padding-inline: 14px;
  }
  .header nav {
    gap: 12px;
  }
  .wrap {
    width: calc(100% - 32px);
  }
  .hero .text-link {
    display: block;
    margin: 17px 0 0;
  }
  .tab {
    padding-inline: 7px;
  }
  .hero h1,
  html[lang="zh-CN"] .hero h1 {
    font-size: 39px;
  }
}
@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
  .button {
    transition:
      background 0.15s,
      border-color 0.15s;
  }
}
/* Current-product narrative: real workspace panels, no reconstructed approval UI. */
.hero {
  padding-block: 78px 64px;
  align-items: center;
}
.hero-copy {
  padding-top: 0;
}
.product-stage {
  background: #e3ecef;
  border-radius: 20px;
  padding: 36px 44px 0;
  overflow: hidden;
}
.product-window {
  border: 1px solid #d4dbd9;
  border-radius: 12px 12px 0 0;
  overflow: hidden;
  background: #f2f1ed;
  box-shadow: 0 16px 42px #354e4a14;
  max-height: 620px;
}
.product-window img {
  width: 125%;
  max-width: none;
  margin-left: -25%;
}
.stage-1 {
  background: #e8eee8;
  padding: 26px 44px;
}
.stage-1 .product-window {
  border-radius: 12px;
  max-height: none;
}
.stage-1 img {
  width: 100%;
  margin: 0;
}
.stage-2 {
  background: #ecebe5;
}
.stage-2 .product-window {
  min-height: 430px;
}
.panel-caption {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 70px;
  padding: 27px 0 0;
}
.panel-caption h3 {
  font-size: 22px;
  max-width: 450px;
  font-weight: 500;
}
.panel-caption p {
  font-size: 15px;
  color: var(--muted);
  max-width: 550px;
}
.mobile-sample {
  display: none;
}
.overview {
  padding-block: 110px 95px;
}
.mobile-art {
  max-height: 700px;
  background: #e9eee7;
}
.phone {
  width: 266px;
  border-radius: 34px;
  border-width: 6px;
}
.work-depth {
  padding-block: 0 110px;
}
.depth-list {
  margin-top: 48px;
}
.depth-list article {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 70px;
  padding: 27px 0;
  border-top: 1px solid var(--line);
}
.depth-list p {
  font-size: 15px;
  color: var(--muted);
  max-width: 560px;
}
.source-strip {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 70px;
  padding: 30px;
  margin-top: 20px;
  background: #f4f6f5;
  border-radius: 12px;
}
.source-strip p {
  font-size: 19px;
  font-weight: 500;
}
.source-strip span {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}
.version-note {
  font-size: 12px;
  color: var(--muted);
  margin-top: 28px;
}
.version-note + .download-source {
  margin-top: 25px;
}
@media (max-width: 1050px) {
  .hero {
    padding-block: 65px 50px;
  }
  .product-stage {
    padding: 27px 28px 0;
  }
  .stage-1 {
    padding-bottom: 25px;
  }
  .panel-caption {
    gap: 35px;
  }
  .panel-caption h3 {
    font-size: 20px;
  }
  .depth-list article,
  .source-strip {
    gap: 35px;
  }
}
@media (max-width: 740px) {
  .hero {
    padding-block: 48px 35px;
  }
  .hero h1,
  html[lang="zh-CN"] .hero h1 {
    font-size: clamp(41px, 8.8vw, 65px);
  }
  .hero-copy {
    margin-top: 26px;
  }
  .hero .text-link {
    display: block;
    margin: 18px 0 0;
    font-size: 14px;
  }
  .tabs {
    border-radius: 12px;
  }
  .tab {
    padding-inline: 9px;
    border-radius: 8px;
  }
  .product-stage {
    padding: 18px 14px 0;
    border-radius: 12px;
  }
  .product-window {
    border-radius: 7px 7px 0 0;
    max-height: 345px;
  }
  .product-window img {
    width: 760px;
    margin-left: -160px;
  }
  .stage-1 {
    padding-bottom: 18px;
  }
  .stage-1 .product-window {
    height: 460px;
  }
  .stage-1 img {
    width: 720px;
    height: 460px;
    margin-left: calc((100% - 720px) / 2);
  }
  .stage-2 .product-window {
    min-height: 270px;
  }
  .panel-caption {
    display: block;
    padding-top: 22px;
  }
  .panel-caption h3 {
    font-size: 21px;
    max-width: none;
  }
  .panel-caption p {
    font-size: 14px;
    margin-top: 12px;
  }
  .mobile-sample {
    display: block;
    font-size: 11px;
    color: var(--muted);
    margin-top: 14px;
  }
  .overview {
    padding-block: 70px 60px;
  }
  .mobile-art {
    max-height: 620px;
  }
  .phone {
    width: 235px;
    border-radius: 30px;
  }
  .work-depth {
    padding-block: 0 65px;
  }
  .depth-list {
    margin-top: 30px;
  }
  .depth-list article {
    display: block;
    padding-block: 24px;
  }
  .depth-list h3 {
    font-size: 21px;
  }
  .depth-list p {
    margin-top: 12px;
    font-size: 14px;
  }
  .source-strip {
    display: block;
    padding: 23px;
  }
  .source-strip p {
    font-size: 18px;
    margin-bottom: 12px;
  }
  .source-strip span {
    font-size: 13px;
  }
}
@media (max-width: 380px) {
  .tab {
    font-size: 11px;
    padding-inline: 5px;
  }
}
.stage-0 .product-window { height: 510px; }
.stage-0 .product-window img { margin-top: -110px; }
@media (max-width: 740px) {
  .stage-0 .product-window { height: 300px; }
  .stage-0 .product-window img { width: 780px; margin-left: calc(50% - 540px); margin-top: -100px; }
}