:root {
  --ink: #0C1718;
  --ink-2: #122426;
  --surface: #F5F7F6;
  --white: #FFFFFF;
  --soft: #EAF0EF;
  --text: #0C1724;
  --muted: #68767D;
  --green: #35E38A;
  --green-dark: #0E9F65;
  --blue: #2677FF;
  --apricot: #F2A65A;
  --cyan: #36D1C4;
  --line: #D4DEDC;
  --dark-line: #294043;
  --nav-height: 88px;
  --container: 1248px;
  --page-gutter: 24px;
  --font: "Hiragino Sans GB", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", Arial, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  background: var(--ink);
}

body {
  margin: 0;
  color: var(--text);
  background: var(--surface);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

p,
h1,
h2,
h3,
ol,
dl,
dd {
  margin: 0;
}

.container {
  width: min(var(--container), calc(100% - (var(--page-gutter) * 2)));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  color: var(--white);
  background: var(--ink);
  border-bottom: 1px solid transparent;
  transition: background-color 150ms ease-out, border-color 150ms ease-out;
}

.site-header.is-scrolled {
  background: rgba(12, 23, 24, .96);
  border-bottom-color: var(--dark-line);
}

.nav-inner {
  height: 100%;
  display: flex;
  align-items: center;
}

.brand {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  font-size: 24px;
  line-height: 1.3;
  font-weight: 700;
  white-space: nowrap;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 42px;
  margin-left: 94px;
}

.main-nav a,
.footer-nav a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.main-nav a {
  color: rgba(255, 255, 255, .72);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--white);
}

.main-nav a.active {
  font-weight: 700;
}

.nav-download {
  width: 184px;
  min-width: 184px;
  height: 48px;
  margin-left: auto;
}

.button {
  min-width: 180px;
  min-height: 56px;
  padding: 14px 24px;
  border: 1px solid transparent;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
  font-size: 16px;
  line-height: 26px;
  font-weight: 700;
  white-space: nowrap;
  cursor: pointer;
  transition: transform 150ms ease-out, background-color 150ms ease-out, border-color 150ms ease-out, opacity 150ms ease-out;
}

.button-primary {
  background: var(--green);
  color: var(--ink);
}

.button-primary:hover {
  background: #32D985;
  transform: translateY(-1px);
}

.button-primary:active {
  background: #18B66C;
  transform: none;
}

.button-outline {
  background: transparent;
  border-color: var(--line);
}

.button-outline:hover {
  background: rgba(12, 23, 36, .06);
  transform: translateY(-1px);
}

.button-outline:active {
  background: rgba(12, 23, 36, .10);
  transform: none;
}

.button-outline-light {
  color: var(--white);
}

.button-outline-light:hover {
  background: rgba(255, 255, 255, .06);
}

.button-outline-light:active {
  background: rgba(255, 255, 255, .10);
}

.button:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.button[aria-disabled="true"],
.button.is-loading {
  opacity: .45;
  pointer-events: none;
}

.button.is-loading::before {
  width: 16px;
  height: 16px;
  margin-right: 9px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  content: "";
  animation: spin .7s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.hero {
  position: relative;
  isolation: isolate;
  color: var(--white);
  background: var(--ink);
}

.hero::before {
  position: absolute;
  z-index: -1;
  inset: 0 0 0 auto;
  width: 55%;
  background: #123234;
  content: "";
}

.eyebrow {
  width: max-content;
  min-width: 172px;
  min-height: 34px;
  padding: 5px 18px;
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #BFEFE5;
  background: #193033;
  font-size: 14px;
  line-height: 21px;
  font-weight: 700;
}

h1,
h2,
h3 {
  font-weight: 700;
}

h1,
h2 {
  letter-spacing: -1.4px;
}

h1 {
  font-size: 64px;
  line-height: 1.14;
}

h2 {
  font-size: 42px;
  line-height: 1.2;
}

h3 {
  font-size: 24px;
  line-height: 1.3;
}

.hero-lead {
  color: #C8D6D5;
  font-size: 18px;
  line-height: 1.72;
}

.hero-points {
  color: var(--white);
  font-weight: 700;
}

.hero-actions {
  display: flex;
  gap: 16px;
}

.hero-meta,
.download-note,
.download-meta {
  color: #AFC2C2;
  font-size: 14px;
  line-height: 1.5;
}

.media-frame {
  overflow: hidden;
  border-radius: 16px;
}

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

.home-hero {
  min-height: calc(960px - var(--nav-height));
}

.home-hero-grid {
  min-height: calc(960px - var(--nav-height));
  display: grid;
  grid-template-columns: 500px 1fr;
  column-gap: 54px;
}

.home-hero-copy {
  padding-top: 60px;
}

.home-hero-copy h1 {
  margin-top: 56px;
}

.home-hero-copy .hero-lead {
  max-width: 530px;
  margin-top: 40px;
}

.home-hero-copy .hero-points {
  margin-top: 32px;
}

.home-hero-copy .hero-actions {
  margin-top: 28px;
}

.home-hero-copy .hero-meta {
  margin-top: 27px;
}

.home-hero-visual {
  padding-top: 32px;
}

.home-hero-media {
  height: 700px;
  border-radius: 18px;
  box-shadow: 0 18px 48px rgba(0, 18, 20, .16);
}

.journey {
  height: 72px;
  display: flex;
  align-items: center;
  color: #95AAA9;
  font-size: 14px;
}

.journey i {
  width: 104px;
  height: 1px;
  margin-inline: 22px;
  background: var(--cyan);
}

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

.section-heading {
  padding-top: 102px;
}

.section-heading p {
  margin-top: 16px;
  color: var(--muted);
}

.section-heading-dark h2,
.section-heading-dark p {
  color: var(--white);
}

.categories-section {
  min-height: 1110px;
  scroll-margin-top: 104px;
}

.categories-media {
  height: 620px;
  margin-top: 66px;
  border-radius: 14px;
}

.numbered-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.category-grid {
  margin-top: 48px;
}

.index {
  display: inline-block;
  color: var(--green);
  font-size: 12px;
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: 1.4px;
}

.category-card h3,
.social-card h3 {
  margin-top: 20px;
}

.category-card p,
.social-card p {
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.start-section {
  min-height: 900px;
  background: var(--soft);
}

.start-layout {
  margin-top: 63px;
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: 44px;
}

.start-cards {
  display: grid;
  gap: 20px;
}

.feature-card {
  min-height: 220px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--white);
}

.feature-card h3,
.dark-card h3 {
  margin-top: 22px;
}

.feature-card p,
.dark-card p {
  margin-top: 10px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.feature-card-blue .index,
.dark-card-blue .index {
  color: var(--blue);
}

.start-media {
  height: 540px;
}

.learning-section {
  min-height: 950px;
  color: var(--white);
  background: var(--ink);
}

.learning-layout {
  margin-top: 66px;
  display: grid;
  grid-template-columns: 680px 1fr;
  gap: 48px;
}

.learning-media {
  height: 510px;
}

.learning-media img {
  object-position: right center;
}

.learning-cards {
  display: grid;
  align-content: start;
  gap: 20px;
}

.dark-card {
  min-height: 180px;
  padding: 24px;
  border: 1px solid var(--dark-line);
  border-radius: 12px;
  background: var(--ink-2);
}

.dark-card p {
  color: #AFC2C2;
}

.rules-line {
  margin-top: 22px;
  color: #BFD0CF;
}

.social-section {
  min-height: 1120px;
}

.social-media {
  height: 620px;
  margin-top: 66px;
}

.social-grid {
  margin-top: 48px;
}

.stability-section {
  min-height: 1010px;
  background: var(--soft);
}

.stability-grid {
  margin-top: 68px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px 32px;
}

.stability-grid article {
  min-height: 148px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 12px;
  display: grid;
  grid-template-columns: 48px 1fr;
  align-content: center;
  background: var(--white);
}

.stability-grid h3 {
  grid-column: 2;
  grid-row: 1;
}

.stability-grid .index {
  grid-column: 1;
  grid-row: 1;
  padding-top: 8px;
}

.stability-grid p {
  grid-column: 2;
  margin-top: 10px;
  color: var(--muted);
}

.site-footer {
  min-height: 270px;
  color: #AFC2C2;
  background: var(--ink);
  font-size: 14px;
}

.footer-grid {
  position: relative;
  min-height: 270px;
  padding-top: 54px;
  display: grid;
  grid-template-columns: 520px 1fr;
}

.footer-grid::after {
  position: absolute;
  right: 0;
  bottom: 70px;
  left: 0;
  height: 1px;
  background: var(--dark-line);
  content: "";
}

.footer-brand {
  margin-bottom: 12px;
  color: var(--white);
  font-size: 24px;
  line-height: 1.3;
  font-weight: 700;
}

.footer-nav {
  display: flex;
  gap: 76px;
  color: var(--white);
  font-size: 16px;
}

.footer-grid > div:last-child > p {
  margin-top: 5px;
}

/* Download page */
.download-hero {
  min-height: calc(940px - var(--nav-height));
}

.download-hero-grid {
  min-height: calc(940px - var(--nav-height));
  display: grid;
  grid-template-columns: 550px 1fr;
  gap: 44px;
}

.download-hero-copy {
  padding-top: 60px;
}

.download-hero-copy .eyebrow {
  min-width: 188px;
}

.download-hero-copy h1 {
  margin-top: 64px;
}

.download-hero-copy .hero-lead {
  max-width: 510px;
  margin-top: 62px;
}

.download-trigger {
  width: 200px;
  margin-top: 60px;
}

.download-note {
  margin-top: 16px;
}

.download-meta {
  margin-top: 23px;
  color: #829797;
}

.download-hero-media {
  position: relative;
  height: 670px;
  margin-top: 32px;
  border-radius: 18px;
}

.download-hero-media img,
.version-media img {
  position: absolute;
  width: 185%;
  max-width: none;
  height: auto;
  top: -9.4%;
  right: -3%;
  object-fit: initial;
}

.version-section {
  min-height: 830px;
}

.version-layout {
  margin-top: 66px;
  display: grid;
  grid-template-columns: 580px 1fr;
  gap: 44px;
}

.version-table {
  height: 504px;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: var(--white);
}

.version-table > div {
  min-height: 72px;
  padding: 0 24px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.version-table > div:last-child {
  border-bottom: 0;
}

.version-table dt {
  color: var(--muted);
}

.version-table dd {
  color: var(--text);
  font-weight: 700;
  text-align: right;
}

.version-media {
  position: relative;
  height: 504px;
}

.version-media img {
  width: 183%;
  top: -14.8%;
  right: -2%;
}

.install-section {
  min-height: 880px;
  background: var(--soft);
}

.install-media {
  height: 560px;
  margin-top: 66px;
}

.install-media img {
  object-position: left center;
}

.install-steps {
  display: none;
}

.update-section {
  min-height: 760px;
}

.update-layout {
  margin-top: 45px;
  display: grid;
  grid-template-columns: 608px 1fr;
  gap: 44px;
}

.update-list,
.install-steps {
  padding: 0;
  list-style: none;
}

.update-list li,
.install-steps li {
  display: grid;
  grid-template-columns: 56px 1fr;
  align-items: start;
}

.update-list li + li {
  margin-top: 30px;
}

.update-list p,
.install-steps p {
  line-height: 1.65;
}

.update-media {
  height: 430px;
}

.update-media img {
  object-position: right center;
}

.faq-section {
  min-height: 840px;
  color: var(--white);
  background: var(--ink);
}

.faq-list {
  margin-top: 62px;
  display: grid;
  gap: 12px;
}

.faq-list details {
  min-height: 80px;
  border: 1px solid var(--dark-line);
  border-radius: 10px;
  overflow: hidden;
  background: var(--ink-2);
}

.faq-list summary {
  position: relative;
  min-height: 78px;
  padding: 0 56px 0 22px;
  display: flex;
  align-items: center;
  color: var(--white);
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}

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

.faq-list summary span,
.faq-list summary span::after {
  position: absolute;
  top: 50%;
  right: 22px;
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: var(--green);
  content: "";
  transition: transform 150ms ease-out;
}

.faq-list summary span::after {
  top: 0;
  right: 0;
  transform: rotate(90deg);
}

.faq-list details[open] summary {
  min-height: 44px;
}

.faq-list details[open] summary span::after {
  transform: rotate(0deg);
}

.answer {
  padding: 0 56px 14px 22px;
  color: #AFC2C2;
  font-size: 14px;
  line-height: 1.5;
}

.mobile-download-bar {
  display: none;
}

/* 404 page */
.error-hero {
  min-height: calc(920px - var(--nav-height));
}

.error-hero-grid {
  min-height: calc(920px - var(--nav-height));
  display: grid;
  grid-template-columns: 500px 1fr;
  gap: 54px;
}

.error-copy {
  grid-column: 1;
  grid-row: 1;
  padding-top: 50px;
}

.error-code {
  color: var(--green);
  font-size: 88px;
  line-height: 1;
  font-weight: 700;
  letter-spacing: -1.4px;
}

.error-copy h1 {
  margin-top: 53px;
  font-size: 54px;
  line-height: 1.22;
}

.error-copy .hero-lead {
  max-width: 500px;
  margin-top: 68px;
}

.error-copy .hero-actions {
  margin-top: 71px;
}

.error-visual {
  grid-column: 2;
  grid-row: 1;
  height: 600px;
  margin-top: 42px;
  border-radius: 18px;
}

.route-hint {
  width: 374px;
  margin-top: 112px;
  display: grid;
  grid-template-columns: 90px 1fr 70px 90px;
  align-items: center;
  color: #95AAA9;
  font-size: 14px;
}

.route-hint i {
  height: 1px;
  background: var(--cyan);
}

.shortcuts-section {
  min-height: 460px;
  background: var(--soft);
}

.shortcuts-section h2 {
  padding-top: 38px;
  font-size: 36px;
}

.shortcut-grid {
  margin-top: 34px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 48px;
}

.shortcut-card {
  min-height: 250px;
  padding: 28px 24px 24px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--white);
  box-shadow: 0 8px 24px rgba(0, 18, 20, .10);
}

.shortcut-card .accent {
  width: 48px;
  height: 8px;
  border-radius: 999px;
  display: block;
  background: var(--green);
}

.shortcut-download .accent {
  background: var(--blue);
}

.shortcut-card h3 {
  margin-top: 27px;
}

.shortcut-card p {
  max-width: 420px;
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.shortcut-card .button {
  min-width: 160px;
  min-height: 48px;
  margin-top: 20px;
  padding-block: 10px;
}

@media (min-width: 1200px) {
  .home-hero-visual,
  .home-hero-copy {
    transition: transform 150ms ease-out;
  }
}

@media (min-width: 768px) and (max-width: 1199px) {
  :root {
    --container: 754px;
    --page-gutter: 40px;
  }

  .main-nav {
    margin-left: 90px;
    gap: 42px;
  }

  h1 {
    font-size: 52px;
  }

  .home-hero {
    min-height: calc(1180px - var(--nav-height));
  }

  .home-hero-grid {
    min-height: calc(1180px - var(--nav-height));
    display: block;
  }

  .home-hero-copy {
    padding-top: 42px;
  }

  .home-hero-copy h1 {
    margin-top: 58px;
  }

  .home-hero-copy .hero-lead {
    margin-top: 38px;
  }

  .home-hero-copy .hero-points {
    margin-top: 31px;
  }

  .home-hero-copy .hero-actions {
    margin-top: 28px;
  }

  .home-hero-copy .hero-meta {
    margin-top: 26px;
  }

  .home-hero-visual {
    padding-top: 60px;
  }

  .home-hero-media {
    height: 390px;
  }

  .journey {
    display: none;
  }

  .section-heading {
    padding-top: 88px;
  }

  .categories-section {
    min-height: 1280px;
  }

  .categories-media {
    height: 420px;
    margin-top: 86px;
  }

  .category-grid {
    margin-top: 80px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px 22px;
  }

  .category-card {
    min-height: 164px;
    padding: 20px 22px;
    border-radius: 12px;
    background: var(--soft);
  }

  .category-card h3,
  .social-card h3 {
    margin-top: 12px;
  }

  .start-section {
    min-height: 1180px;
  }

  .start-layout {
    margin-top: 88px;
    display: flex;
    flex-direction: column;
    gap: 50px;
  }

  .start-media {
    order: -1;
    height: 420px;
  }

  .start-media img {
    object-position: left center;
  }

  .start-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 34px;
  }

  .feature-card {
    min-height: 250px;
  }

  .learning-section {
    min-height: 1220px;
  }

  .learning-layout {
    margin-top: 88px;
    display: block;
  }

  .learning-media {
    height: 430px;
  }

  .learning-cards {
    margin-top: 50px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 34px;
  }

  .dark-card {
    min-height: 270px;
  }

  .rules-line {
    display: none;
  }

  .social-section {
    min-height: 1260px;
  }

  .social-media {
    height: 500px;
    margin-top: 88px;
  }

  .social-grid {
    margin-top: 50px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px 22px;
  }

  .social-card {
    min-height: 144px;
    padding: 20px;
    border-radius: 12px;
    background: var(--soft);
  }

  .stability-section {
    min-height: 920px;
  }

  .stability-grid {
    margin-top: 88px;
    gap: 28px 22px;
  }

  .stability-grid article {
    min-height: 112px;
    padding: 18px;
    display: block;
  }

  .stability-grid article .index {
    display: none;
  }

  .stability-grid h3 {
    font-size: 16px;
  }

  .stability-grid p {
    margin-top: 6px;
    font-size: 14px;
  }

  .footer-grid {
    grid-template-columns: 520px 1fr;
  }

  .home-page .site-footer,
  .home-page .footer-grid {
    min-height: 300px;
  }

  .footer-nav {
    gap: 56px;
  }

  .download-hero {
    min-height: calc(1160px - var(--nav-height));
  }

  .download-hero-grid {
    min-height: calc(1160px - var(--nav-height));
    display: block;
  }

  .download-hero-copy {
    padding-top: 42px;
  }

  .download-hero-copy h1 {
    margin-top: 58px;
  }

  .download-hero-copy .hero-lead {
    margin-top: 32px;
  }

  .download-trigger {
    margin-top: 56px;
  }

  .download-hero-media {
    height: 390px;
    margin-top: 60px;
  }

  .download-hero-media img {
    width: 194.7%;
    top: -49%;
    right: -3.5%;
  }

  .version-section {
    min-height: 1080px;
  }

  .version-layout {
    margin-top: 68px;
    display: block;
  }

  .version-media {
    display: none;
  }

  .install-section {
    min-height: 900px;
  }

  .install-media {
    height: 540px;
    margin-top: 86px;
  }

  .update-section {
    min-height: 1040px;
  }

  .update-layout {
    margin-top: 80px;
    display: flex;
    flex-direction: column;
    gap: 54px;
  }

  .update-media {
    order: -1;
    height: 380px;
  }

  .update-list li + li {
    margin-top: 24px;
  }

  .faq-section {
    min-height: 1220px;
  }

  .faq-list {
    margin-top: 68px;
  }

  .faq-list details {
    min-height: 106px;
  }

  .faq-list summary {
    min-height: 104px;
  }

  .error-hero {
    min-height: calc(1160px - var(--nav-height));
  }

  .error-hero-grid {
    min-height: calc(1160px - var(--nav-height));
    display: flow-root;
  }

  .error-copy {
    padding-top: 40px;
  }

  .error-code {
    font-size: 76px;
  }

  .error-copy h1 {
    margin-top: 52px;
    font-size: 48px;
  }

  .error-copy .hero-lead {
    margin-top: 50px;
    font-size: 16px;
  }

  .error-copy .hero-actions {
    margin-top: 70px;
  }

  .error-visual {
    height: 430px;
    margin-top: 43px;
  }

  .route-hint {
    display: none;
  }

  .shortcuts-section {
    min-height: 300px;
  }

  .shortcuts-section h2 {
    display: none;
  }

  .shortcut-grid {
    margin-top: 0;
    padding-top: 40px;
    gap: 34px;
  }

  .shortcut-card {
    min-height: 250px;
  }
}

@media (max-width: 767px) {
  :root {
    --container: 350px;
    --page-gutter: 20px;
    --nav-height: 72px;
  }

  .site-header {
    height: 72px;
  }

  .brand {
    font-size: 24px;
  }

  .main-nav {
    display: none;
  }

  .nav-download {
    width: 154px;
    min-width: 154px;
    padding-inline: 12px;
  }

  h1 {
    font-size: 44px;
    line-height: 1.2;
  }

  h2 {
    font-size: 34px;
  }

  .hero::before {
    width: 49%;
  }

  .button {
    width: 100%;
  }

  .eyebrow {
    min-width: 172px;
  }

  .home-hero {
    min-height: calc(1040px - var(--nav-height));
  }

  .home-hero-grid {
    min-height: calc(1040px - var(--nav-height));
    display: block;
  }

  .home-hero-copy {
    padding-top: 33px;
  }

  .home-hero-copy h1 {
    margin-top: 53px;
  }

  .home-hero-copy .hero-lead {
    margin-top: 69px;
    font-size: 16px;
    line-height: 1.75;
  }

  .home-hero-copy .hero-points {
    max-width: 300px;
    margin-top: 40px;
  }

  .home-hero-copy .hero-actions {
    margin-top: 52px;
    display: grid;
    gap: 14px;
  }

  .home-hero-copy .hero-meta {
    margin-top: 18px;
  }

  .home-hero-visual {
    padding-top: 42px;
  }

  .home-hero-media {
    height: 220px;
    border-radius: 14px;
  }

  .journey {
    display: none;
  }

  .section-heading {
    padding-top: 70px;
  }

  .section-heading p {
    margin-top: 16px;
  }

  .categories-section {
    min-height: 1610px;
    scroll-margin-top: 80px;
  }

  .categories-media {
    height: 270px;
    margin-top: 66px;
    border-radius: 12px;
  }

  .category-grid {
    margin-top: 60px;
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .category-card {
    min-height: 188px;
    padding: 20px;
    border-radius: 12px;
    background: var(--soft);
  }

  .category-card h3,
  .social-card h3 {
    margin-top: 20px;
  }

  .start-section {
    min-height: 1490px;
  }

  .start-layout {
    margin-top: 94px;
    display: flex;
    flex-direction: column;
    gap: 60px;
  }

  .start-media {
    order: -1;
    height: 250px;
    border-radius: 12px;
  }

  .start-media img {
    object-position: left center;
  }

  .start-cards {
    gap: 40px;
  }

  .feature-card {
    min-height: 280px;
    padding: 24px;
  }

  .learning-section {
    min-height: 1450px;
  }

  .learning-layout {
    margin-top: 94px;
    display: block;
  }

  .learning-media {
    height: 250px;
    border-radius: 12px;
  }

  .learning-cards {
    margin-top: 60px;
    gap: 40px;
  }

  .dark-card {
    min-height: 290px;
    padding: 24px;
  }

  .dark-card:nth-child(2) {
    min-height: 300px;
  }

  .rules-line {
    display: none;
  }

  .social-section {
    min-height: 1880px;
  }

  .social-media {
    height: 300px;
    margin-top: 94px;
    border-radius: 12px;
  }

  .social-grid {
    margin-top: 60px;
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .social-card {
    min-height: 238px;
    padding: 20px;
    border-radius: 12px;
    background: var(--soft);
  }

  .stability-section {
    min-height: 1310px;
  }

  .stability-grid {
    margin-top: 92px;
    grid-template-columns: 1fr;
    gap: 29px;
  }

  .stability-grid article {
    min-height: 116px;
    padding: 16px;
    display: flex;
    align-items: center;
  }

  .stability-grid .index {
    display: none;
  }

  .stability-grid h3 {
    width: 104px;
    flex: 0 0 auto;
    font-size: 14px;
    line-height: 1.5;
  }

  .stability-grid p {
    margin: 0;
    font-size: 14px;
    line-height: 1.5;
  }

  .site-footer {
    min-height: 360px;
  }

  .footer-grid {
    min-height: 360px;
    padding-top: 55px;
    display: block;
  }

  .footer-grid > div:first-child > p:not(.footer-brand) {
    display: none;
  }

  .footer-grid > div:last-child {
    display: flex;
    flex-direction: column;
  }

  .footer-grid > div:last-child > p:first-of-type {
    order: -2;
    margin-top: 12px;
  }

  .footer-grid > div:last-child > p:last-of-type {
    order: -1;
    margin-top: 3px;
  }

  .footer-nav {
    margin-top: 29px;
    gap: 52px;
  }

  .footer-grid::after {
    bottom: 70px;
  }

  .download-hero {
    min-height: calc(1160px - var(--nav-height));
  }

  .download-hero-grid {
    min-height: calc(1160px - var(--nav-height));
    display: block;
  }

  .download-hero-copy {
    padding-top: 33px;
  }

  .download-hero-copy .eyebrow {
    min-width: 188px;
  }

  .download-hero-copy h1 {
    margin-top: 53px;
    font-size: 42px;
  }

  .download-hero-copy .hero-lead {
    max-width: 320px;
    margin-top: 64px;
    font-size: 16px;
    line-height: 1.75;
  }

  .download-trigger {
    width: 100%;
    margin-top: 49px;
  }

  .download-note {
    max-width: 270px;
    margin-top: 26px;
  }

  .download-meta {
    max-width: 330px;
    margin-top: 33px;
  }

  .download-hero-media {
    height: 360px;
    margin-top: 48px;
    border-radius: 14px;
  }

  .download-hero-media img {
    width: 189.6%;
    top: -8.5%;
    right: -3.2%;
  }

  .version-section {
    min-height: 1030px;
  }

  .version-layout {
    margin-top: 92px;
    display: block;
  }

  .version-table {
    height: 574px;
  }

  .version-table > div {
    min-height: 82px;
    padding: 13px 18px;
    display: block;
  }

  .version-table dt {
    font-size: 14px;
    line-height: 21px;
  }

  .version-table dd {
    margin-top: 5px;
    line-height: 26px;
    text-align: left;
  }

  .version-media {
    display: none;
  }

  .install-section {
    min-height: 830px;
  }

  .install-media {
    height: 300px;
    margin-top: 92px;
    border-radius: 12px;
  }

  .install-steps {
    margin-top: 56px;
    display: grid;
    gap: 25px;
  }

  .install-steps li {
    grid-template-columns: 48px 1fr;
  }

  .install-steps p {
    font-size: 14px;
    line-height: 1.5;
  }

  .update-section {
    min-height: 1420px;
  }

  .update-layout {
    margin-top: 94px;
    display: flex;
    flex-direction: column;
    gap: 60px;
  }

  .update-media {
    order: -1;
    height: 300px;
    border-radius: 12px;
  }

  .update-list {
    display: grid;
    gap: 26px;
  }

  .update-list li {
    min-height: 104px;
    padding: 18px;
    border-radius: 10px;
    display: block;
    background: var(--soft);
  }

  .update-list li + li {
    margin-top: 0;
  }

  .update-list p {
    margin-top: 18px;
    font-size: 14px;
    line-height: 1.5;
  }

  .faq-section {
    min-height: 1910px;
  }

  .faq-list {
    margin-top: 87px;
    gap: 12px;
  }

  .faq-list details {
    min-height: 106px;
  }

  .faq-list summary {
    min-height: 104px;
    padding-left: 22px;
  }

  .faq-list details[open] summary {
    min-height: 50px;
  }

  .answer {
    padding-bottom: 17px;
  }

  .mobile-download-bar {
    position: fixed;
    z-index: 120;
    right: 12px;
    bottom: max(10px, env(safe-area-inset-bottom));
    left: 12px;
    height: 76px;
    padding: 10px 12px;
    border: 1px solid #2D4748;
    border-radius: 16px;
    display: block;
    background: rgba(16, 36, 38, .98);
    box-shadow: 0 8px 24px rgba(0, 18, 20, .10);
  }

  .mobile-download-bar .button {
    min-height: 54px;
    margin: 0;
  }

  .error-hero {
    min-height: calc(1230px - var(--nav-height));
  }

  .error-hero-grid {
    min-height: calc(1230px - var(--nav-height));
    display: flex;
    flex-direction: column;
  }

  .error-visual {
    order: 1;
    height: 260px;
    margin-top: 38px;
    border-radius: 14px;
  }

  .error-copy {
    order: 2;
    padding-top: 0;
  }

  .error-code {
    margin-top: 26px;
    font-size: 72px;
  }

  .error-copy h1 {
    margin-top: 42px;
    font-size: 40px;
    line-height: 1.35;
  }

  .error-copy .hero-lead {
    margin-top: 61px;
    font-size: 16px;
    line-height: 1.8;
  }

  .error-copy .hero-actions {
    margin-top: 80px;
    display: grid;
    gap: 14px;
  }

  .route-hint {
    width: 100%;
    margin-top: 50px;
    grid-template-columns: 68px 102px 1fr;
    gap: 0;
  }

  .route-hint span:last-child {
    display: none;
  }

  .route-hint span:nth-of-type(2)::after {
    content: " / 下载页面";
  }

  .shortcuts-section {
    min-height: 690px;
  }

  .shortcuts-section h2 {
    padding-top: 40px;
    font-size: 34px;
  }

  .shortcut-grid {
    margin-top: 32px;
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .shortcut-card {
    min-height: 250px;
    padding: 28px 24px 24px;
  }

  .shortcut-card .button {
    width: auto;
  }
}

@media (max-width: 389px) {
  :root {
    --container: calc(100% - 32px);
    --page-gutter: 16px;
  }

  body {
    font-size: 14px;
  }

  .brand {
    font-size: 21px;
  }

  .nav-download {
    width: 148px;
    min-width: 148px;
    font-size: 14px;
  }

  h1 {
    font-size: 42px;
  }

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

  .stability-grid article {
    padding: 14px;
  }

  .stability-grid h3 {
    width: 96px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
  }
}

/* SEO content and trust pages */
picture {
  width: 100%;
  height: 100%;
  display: block;
}

.site-footer,
.footer-grid {
  min-height: 340px;
}

.footer-grid {
  grid-template-columns: 360px 1fr;
}

.footer-nav {
  flex-wrap: wrap;
  gap: 8px 34px;
}

.footer-nav-secondary {
  margin-top: 12px;
  color: #AFC2C2;
  font-size: 14px;
}

.footer-grid::after {
  bottom: 48px;
}

.content-main {
  background: var(--surface);
}

.content-hero {
  min-height: 430px;
}

.content-hero::before {
  width: 42%;
}

.content-hero-inner {
  min-height: 430px;
  padding-block: 52px 66px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.breadcrumb {
  margin-bottom: 34px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: #9FB1B0;
  font-size: 14px;
}

.breadcrumb a:hover {
  color: var(--white);
}

.content-hero h1 {
  max-width: 860px;
  font-size: 52px;
}

.content-hero .hero-lead {
  max-width: 800px;
  margin-top: 24px;
}

.article-section {
  padding-block: 88px;
  background: var(--white);
}

.article-section:nth-child(odd) {
  background: var(--soft);
}

.article-heading {
  max-width: 820px;
}

.article-heading p {
  margin-top: 14px;
  color: var(--muted);
}

.article-grid {
  margin-top: 40px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

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

.article-card,
.legal-copy {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--white);
}

.article-card h2,
.article-card h3,
.legal-copy h2 {
  font-size: 24px;
  letter-spacing: -.4px;
}

.article-card p,
.legal-copy p,
.legal-copy li {
  margin-top: 12px;
  color: var(--muted);
}

.article-card ul,
.legal-copy ul,
.legal-copy ol {
  margin: 16px 0 0;
  padding-left: 22px;
}

.article-card li + li,
.legal-copy li + li {
  margin-top: 8px;
}

.article-card .index {
  margin-bottom: 18px;
}

.article-actions {
  margin-top: 36px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.legal-layout {
  max-width: 900px;
}

.legal-copy + .legal-copy {
  margin-top: 22px;
}

.updated-date {
  margin-top: 18px;
  color: #AFC2C2;
  font-size: 14px;
}

.trust-callout {
  padding: 24px;
  border-left: 4px solid var(--green);
  border-radius: 0 12px 12px 0;
  background: #E8F8F0;
}

.trust-callout p + p {
  margin-top: 10px;
}

.footer-consent-button {
  min-height: 44px;
  padding: 0;
  border: 0;
  color: inherit;
  background: transparent;
  font: inherit;
  cursor: pointer;
}

.footer-consent-button:hover {
  color: var(--white);
}

.consent-banner {
  position: fixed;
  z-index: 500;
  right: 24px;
  bottom: 24px;
  left: 24px;
  max-width: 920px;
  margin-inline: auto;
  padding: 20px;
  border: 1px solid var(--dark-line);
  border-radius: 14px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: center;
  color: #C8D6D5;
  background: rgba(12, 23, 24, .98);
  box-shadow: 0 18px 48px rgba(0, 0, 0, .28);
  font-size: 14px;
}

.consent-title {
  margin-bottom: 4px;
  color: var(--white);
  font-size: 17px;
  font-weight: 700;
}

.consent-actions {
  display: flex;
  gap: 10px;
}

.consent-actions .button {
  min-width: 104px;
  min-height: 46px;
  padding: 9px 18px;
  color: var(--white);
}

.consent-actions .button-primary {
  color: var(--ink);
}

@media (min-width: 768px) and (max-width: 1199px) {
  .main-nav {
    display: none;
  }

  .site-footer,
  .footer-grid,
  .home-page .site-footer,
  .home-page .footer-grid {
    min-height: 400px;
  }

  .footer-grid {
    grid-template-columns: 240px 1fr;
  }

  .article-grid-three {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 767px) {
  .site-footer,
  .footer-grid {
    min-height: 520px;
  }

  .footer-nav {
    gap: 6px 24px;
  }

  .footer-nav-secondary {
    margin-top: 18px;
  }

  .content-hero,
  .content-hero-inner {
    min-height: 400px;
  }

  .content-hero-inner {
    padding-block: 42px 54px;
  }

  .content-hero h1 {
    font-size: 38px;
  }

  .article-section {
    padding-block: 60px;
  }

  .article-grid,
  .article-grid-three {
    grid-template-columns: 1fr;
  }

  .article-card,
  .legal-copy {
    padding: 22px;
  }

  .consent-banner {
    right: 12px;
    bottom: 12px;
    left: 12px;
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .consent-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }
}