:root {
  --night: #17142a;
  --night-2: #211d39;
  --paper: #fffdf7;
  --cream: #f2efe4;
  --ink: #272337;
  --muted: #6d6879;
  --line: #d9d4c8;
  --lime: #c9f15c;
  --lime-dark: #a9d233;
  --violet: #7563e7;
  --violet-light: #e5e0ff;
  --coral: #f27862;
  --white: #ffffff;
  --shell: 1180px;
  --shadow: 0 34px 95px rgba(23, 20, 42, 0.2);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

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

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

button {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: -90px;
  left: 18px;
  z-index: 1000;
  padding: 11px 16px;
  color: var(--night);
  background: var(--lime);
  font-weight: 850;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 18px;
}

.header-shell,
.hero-shell,
.selector-shell,
.section-shell,
.final-shell,
.footer-shell {
  width: min(calc(100% - 40px), var(--shell));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  color: var(--white);
  background: rgba(23, 20, 42, 0.96);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(18px);
}

.header-shell {
  min-height: 76px;
  display: grid;
  grid-template-columns: 210px 1fr 150px;
  gap: 27px;
  align-items: center;
}

.brand {
  width: max-content;
}

.brand img,
.footer-brand img {
  width: auto;
  height: 38px;
  object-fit: contain;
  filter: brightness(0) invert(1);
}

.site-nav {
  display: flex;
  justify-content: center;
  gap: 29px;
  color: #b8b3cf;
  font-size: 13px;
  font-weight: 780;
}

.site-nav a {
  padding: 25px 0 23px;
  transition: color 0.2s ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--lime);
}

.header-cta {
  justify-self: end;
  min-width: 145px;
  padding: 11px 15px;
  color: var(--night);
  background: var(--lime);
  border: 1px solid var(--lime);
  text-align: center;
  font-size: 13px;
  font-weight: 900;
  transition: background 0.2s ease;
}

.header-cta:hover,
.header-cta:focus-visible {
  background: #dcff78;
}

.menu-button {
  display: none;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.22);
  cursor: pointer;
}

.menu-button span {
  display: block;
  width: 19px;
  height: 2px;
  margin: 4px auto;
  background: var(--white);
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 112px 0 220px;
  color: var(--white);
  background:
    radial-gradient(circle at 12% 18%, rgba(117, 99, 231, 0.38), transparent 28%),
    radial-gradient(circle at 85% 35%, rgba(201, 241, 92, 0.12), transparent 25%),
    linear-gradient(140deg, #151126 0%, #211b3b 60%, #17142a 100%);
}

.hero::before {
  content: "";
  position: absolute;
  width: 620px;
  height: 620px;
  left: 50%;
  bottom: -480px;
  transform: translateX(-50%);
  border: 1px solid rgba(201, 241, 92, 0.16);
  border-radius: 50%;
  box-shadow:
    0 0 0 70px rgba(201, 241, 92, 0.025),
    0 0 0 140px rgba(201, 241, 92, 0.014);
}

.hero-noise {
  position: absolute;
  inset: 0;
  opacity: 0.12;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.1) 1px, transparent 1px);
  background-size: 62px 62px;
  mask-image: linear-gradient(to bottom, #000, transparent 88%);
}

.hero-shell {
  position: relative;
  z-index: 2;
  max-width: 980px;
  text-align: center;
}

.eyebrow,
.section-label {
  margin: 0 0 16px;
  color: var(--lime);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(52px, 7.4vw, 92px);
  line-height: 1;
  letter-spacing: -0.06em;
}

.hero-lead {
  max-width: 800px;
  margin: 29px auto 0;
  color: #c8c2db;
  font-size: 18px;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-top: 35px;
}

.button {
  min-height: 57px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 23px;
  padding: 14px 22px;
  border: 1px solid transparent;
  font-weight: 900;
  transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.button-primary {
  min-width: 250px;
  color: var(--night);
  background: var(--lime);
  box-shadow: 0 16px 38px rgba(201, 241, 92, 0.17);
}

.button-primary:hover,
.button-primary:focus-visible {
  transform: translateY(-2px);
  background: #ddff79;
  box-shadow: 0 21px 46px rgba(201, 241, 92, 0.23);
}

.button-primary b {
  font-size: 20px;
}

.button-outline {
  color: var(--white);
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.23);
}

.button-outline:hover,
.button-outline:focus-visible {
  background: rgba(255, 255, 255, 0.09);
}

.hero-answer {
  max-width: 800px;
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 20px;
  margin: 39px auto 0;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  text-align: left;
}

.hero-answer strong {
  color: var(--lime);
  font-size: 13px;
}

.hero-answer p {
  margin: 0;
  color: #aea8c3;
  font-size: 14px;
}

.selector-wrap {
  position: relative;
  z-index: 7;
  margin-top: -145px;
}

.selector-shell {
  overflow: hidden;
  background: var(--paper);
  border: 1px solid rgba(23, 20, 42, 0.14);
  box-shadow: var(--shadow);
}

.selector-heading {
  min-height: 95px;
  display: flex;
  justify-content: space-between;
  gap: 30px;
  align-items: center;
  padding: 22px 30px;
  color: var(--white);
  background: var(--night);
}

.selector-heading p {
  margin: 0 0 5px;
  color: var(--lime);
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 0.15em;
}

.selector-heading h2 {
  margin: 0;
  font-size: 27px;
  line-height: 1.2;
}

.selector-heading > span {
  padding: 8px 12px;
  color: var(--night);
  background: var(--lime);
  font-size: 11px;
  font-weight: 900;
}

.device-switch {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 1px solid var(--line);
}

.device-switch button {
  min-height: 132px;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 4px;
  padding: 16px;
  color: #696477;
  background: var(--cream);
  border: 0;
  border-right: 1px solid var(--line);
  cursor: pointer;
}

.device-switch button:last-child {
  border-right: 0;
}

.device-switch button.is-active {
  color: var(--white);
  background: var(--violet);
}

.device-symbol {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  margin-bottom: 6px;
  color: var(--night);
  background: var(--lime);
  border-radius: 50%;
  font-size: 18px;
  font-weight: 950;
}

.device-switch strong {
  font-size: 15px;
}

.device-switch small {
  color: inherit;
  opacity: 0.72;
  font-size: 10px;
}

.client-panel {
  display: grid;
  grid-template-columns: 1.1fr 1fr 180px;
  gap: 28px;
  align-items: center;
  padding: 32px;
}

.client-identity {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 18px;
  align-items: center;
}

.client-identity img {
  width: 72px;
  height: 72px;
  border-radius: 17px;
}

.client-identity small {
  display: block;
  color: var(--violet);
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 0.13em;
}

.client-identity h3 {
  margin: 3px 0 4px;
  color: var(--night);
  font-size: 23px;
}

.client-identity p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

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

.client-data div {
  padding: 6px 18px;
  border-right: 1px solid var(--line);
}

.client-data dt {
  color: #938c9e;
  font-size: 9px;
  font-weight: 850;
}

.client-data dd {
  margin: 4px 0 0;
  color: var(--night);
  font-size: 13px;
  font-weight: 900;
}

.client-download {
  min-height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--night);
  background: var(--lime);
  font-size: 12px;
  font-weight: 900;
}

.section {
  padding: 106px 0;
}

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

.intro-grid {
  display: grid;
  grid-template-columns: 0.66fr 1.34fr;
  gap: 88px;
  align-items: start;
}

.section-heading {
  position: sticky;
  top: 112px;
}

.section-heading h2,
.requirements-heading h2,
.steps-copy h2,
.platform-heading h2,
.help-heading h2,
.faq-heading h2 {
  margin: 0;
  color: var(--night);
  font-size: clamp(32px, 4.2vw, 53px);
  line-height: 1.15;
  letter-spacing: -0.04em;
}

.intro-copy .intro-lead {
  margin: 0;
  color: var(--night);
  font-size: 23px;
  font-weight: 680;
  line-height: 1.65;
}

.intro-columns {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
  margin-top: 34px;
  padding-top: 33px;
  border-top: 1px solid var(--line);
}

.intro-columns p {
  margin: 0;
  color: var(--muted);
}

.system-rule {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 23px;
  margin-top: 40px;
  padding: 24px 26px;
  color: var(--white);
  background: var(--night);
}

.system-rule span {
  color: var(--lime);
  font-size: 12px;
  font-weight: 900;
}

.system-rule p {
  margin: 0;
  color: #c0bad1;
  font-size: 14px;
}

.requirements-section {
  background: var(--cream);
}

.requirements-heading {
  display: grid;
  grid-template-columns: 1fr 0.72fr;
  gap: 80px;
  align-items: end;
}

.requirements-heading > p {
  margin: 0;
  color: var(--muted);
}

.requirements-table {
  margin-top: 49px;
  background: var(--paper);
  border-top: 3px solid var(--night);
  border-left: 1px solid var(--line);
}

.requirements-head,
.requirements-table article {
  display: grid;
  grid-template-columns: 1.1fr 1fr 0.72fr 0.72fr 1.55fr;
}

.requirements-head {
  min-height: 52px;
  color: var(--white);
  background: var(--night);
}

.requirements-head span {
  display: flex;
  align-items: center;
  padding: 12px 18px;
  border-right: 1px solid rgba(255, 255, 255, 0.14);
  font-size: 10px;
  font-weight: 900;
}

.requirements-table article {
  min-height: 100px;
  border-bottom: 1px solid var(--line);
}

.requirements-table article > * {
  display: flex;
  align-items: center;
  margin: 0;
  padding: 18px;
  border-right: 1px solid var(--line);
}

.requirements-table article > div {
  gap: 13px;
}

.requirements-table b {
  min-width: 38px;
  color: var(--violet);
  font-size: 10px;
}

.requirements-table strong {
  color: var(--night);
  font-size: 15px;
}

.requirements-table article > span {
  color: #514a68;
  font-size: 13px;
  font-weight: 800;
}

.requirements-table article > p {
  color: var(--muted);
  font-size: 12px;
}

.compatibility-note {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 23px;
  margin-top: 23px;
  padding: 22px 25px;
  color: var(--white);
  background: var(--violet);
}

.compatibility-note strong {
  color: var(--lime);
  font-size: 12px;
}

.compatibility-note p {
  margin: 0;
  color: #e8e5ff;
  font-size: 13px;
}

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

.steps-layout {
  display: grid;
  grid-template-columns: 0.67fr 1.33fr;
  gap: 90px;
  align-items: start;
}

.steps-copy {
  position: sticky;
  top: 112px;
}

.steps-copy > p:not(.section-label) {
  margin: 22px 0 0;
  color: var(--muted);
}

.steps-cta {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 26px;
  padding: 11px 19px;
  color: var(--night);
  background: var(--lime);
  font-size: 13px;
  font-weight: 900;
}

.steps-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--night);
}

.steps-list li {
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: 22px;
  padding: 29px 0;
  border-bottom: 1px solid var(--line);
}

.steps-list > li > span {
  color: var(--violet);
  font-size: 11px;
  font-weight: 900;
}

.steps-list h3 {
  margin: -5px 0 8px;
  color: var(--night);
  font-size: 20px;
}

.steps-list p {
  margin: 0;
  color: var(--muted);
}

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

.platform-heading {
  display: grid;
  grid-template-columns: 1fr 0.72fr;
  gap: 80px;
  align-items: end;
}

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

.platform-heading > p {
  margin: 0;
  color: #a9a3bc;
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 47px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  border-left: 1px solid rgba(255, 255, 255, 0.15);
}

.platform-grid article {
  min-height: 290px;
  padding: 27px 24px;
  border-right: 1px solid rgba(255, 255, 255, 0.15);
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.platform-grid article:nth-child(2) {
  background: rgba(117, 99, 231, 0.14);
}

.platform-grid article:nth-child(3) {
  background: rgba(201, 241, 92, 0.06);
}

.platform-grid span {
  color: var(--lime);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.13em;
}

.platform-grid h3 {
  margin: 62px 0 12px;
  font-size: 20px;
}

.platform-grid p {
  margin: 0;
  color: #aaa4bd;
  font-size: 13px;
}

.help-section {
  background: var(--cream);
}

.help-layout {
  display: grid;
  grid-template-columns: 0.62fr 1.38fr;
  gap: 80px;
  align-items: start;
}

.help-heading {
  position: sticky;
  top: 112px;
}

.help-heading > p:not(.section-label) {
  margin: 22px 0 0;
  color: var(--muted);
}

.help-list {
  border-top: 2px solid var(--night);
}

.help-list article {
  display: grid;
  grid-template-columns: 90px 1fr 1.1fr;
  gap: 26px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.help-list span {
  color: var(--violet);
  font-size: 10px;
  font-weight: 900;
}

.help-list h3 {
  margin: -4px 0 0;
  color: var(--night);
  font-size: 18px;
  line-height: 1.4;
}

.help-list p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

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

.faq-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.65fr) minmax(0, 1.35fr);
  gap: 90px;
  align-items: start;
}

.faq-heading {
  position: sticky;
  top: 112px;
}

.faq-heading > p:not(.section-label) {
  margin: 22px 0 0;
  color: var(--muted);
}

.faq-cta {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 26px;
  padding: 11px 19px;
  color: var(--night);
  background: var(--lime);
  font-size: 13px;
  font-weight: 900;
}

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

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

.faq-list summary {
  position: relative;
  padding: 25px 56px 25px 0;
  color: var(--night);
  font-size: 17px;
  font-weight: 850;
  cursor: pointer;
  list-style: none;
}

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

.faq-list summary span {
  position: absolute;
  right: 5px;
  top: 23px;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  color: var(--violet);
  border: 1px solid var(--line);
  border-radius: 50%;
  transition: transform 0.2s ease;
}

.faq-list details[open] summary span {
  transform: rotate(45deg);
}

.faq-list details p {
  max-width: 760px;
  margin: -4px 0 25px;
  color: var(--muted);
}

.final-section {
  padding: 0 0 94px;
  background: var(--paper);
}

.final-shell {
  min-height: 280px;
  display: grid;
  grid-template-columns: 1fr 250px;
  gap: 60px;
  align-items: center;
  padding: 55px 60px;
  color: var(--white);
  background:
    linear-gradient(115deg, rgba(23, 20, 42, 0.98), rgba(53, 42, 99, 0.96)),
    var(--night);
}

.final-shell p {
  margin: 0 0 13px;
  color: var(--lime);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.16em;
}

.final-shell h2 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(28px, 3.6vw, 46px);
  line-height: 1.18;
  letter-spacing: -0.04em;
}

.final-shell > div > span {
  display: block;
  margin-top: 18px;
  color: #aaa4bd;
  font-size: 12px;
}

.final-button {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 22px;
  color: var(--night);
  background: var(--lime);
  font-weight: 900;
  transition: transform 0.2s ease, background 0.2s ease;
}

.final-button:hover,
.final-button:focus-visible {
  transform: translateY(-3px);
  background: #ddff79;
}

.final-button b {
  font-size: 23px;
}

.site-footer {
  padding: 58px 0 36px;
  color: #aaa4bd;
  background: #100e1d;
}

.footer-shell {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 35px 60px;
  align-items: start;
}

.footer-brand p {
  max-width: 680px;
  margin: 18px 0 0;
  color: #706a83;
  font-size: 12px;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(2, auto);
  gap: 8px 27px;
  font-size: 12px;
  font-weight: 760;
}

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

.copyright {
  grid-column: 1 / -1;
  margin: 8px 0 0;
  padding-top: 23px;
  color: #554f67;
  border-top: 1px solid rgba(255, 255, 255, 0.09);
  font-size: 11px;
}

.mobile-download {
  display: none;
}

@media (max-width: 1020px) {
  .header-shell {
    grid-template-columns: 190px 1fr 145px;
  }

  .site-nav {
    gap: 18px;
  }

  .client-panel {
    grid-template-columns: 1fr 1fr;
  }

  .client-download {
    grid-column: 1 / -1;
  }

  .intro-grid,
  .steps-layout,
  .help-layout,
  .faq-layout {
    gap: 50px;
  }
}

@media (max-width: 840px) {
  html {
    scroll-padding-top: 72px;
  }

  .header-shell {
    min-height: 70px;
    grid-template-columns: 1fr auto;
  }

  .brand img {
    height: 34px;
  }

  .header-cta {
    display: none;
  }

  .menu-button {
    display: block;
  }

  .site-nav {
    position: absolute;
    left: 20px;
    right: 20px;
    top: calc(100% + 8px);
    display: none;
    padding: 10px;
    background: var(--night-2);
    border: 1px solid rgba(255, 255, 255, 0.13);
    box-shadow: 0 22px 55px rgba(0, 0, 0, 0.28);
  }

  .site-nav.is-open {
    display: grid;
  }

  .site-nav a {
    padding: 12px 13px;
  }

  .hero {
    padding: 80px 0 205px;
  }

  .hero-answer {
    grid-template-columns: 1fr;
    gap: 7px;
    text-align: center;
  }

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

  .device-switch button:nth-child(2) {
    border-right: 0;
  }

  .device-switch button:nth-child(n+3) {
    border-top: 1px solid var(--line);
  }

  .intro-grid,
  .requirements-heading,
  .steps-layout,
  .platform-heading,
  .help-layout,
  .faq-layout {
    grid-template-columns: 1fr;
  }

  .section-heading,
  .steps-copy,
  .help-heading,
  .faq-heading {
    position: static;
  }

  .requirements-heading,
  .platform-heading {
    gap: 22px;
  }

  .requirements-head,
  .requirements-table article {
    grid-template-columns: 1.1fr 1fr 0.7fr 0.7fr;
  }

  .requirements-head span:last-child {
    display: none;
  }

  .requirements-table article > p {
    grid-column: 1 / -1;
    border-top: 1px solid var(--line);
  }

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

  .help-list article {
    grid-template-columns: 90px 1fr;
  }

  .help-list p {
    grid-column: 2;
  }

  .final-shell {
    grid-template-columns: 1fr;
  }

  .final-button {
    width: min(100%, 290px);
  }

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

  .copyright {
    grid-column: auto;
  }
}

@media (max-width: 600px) {
  .header-shell,
  .hero-shell,
  .selector-shell,
  .section-shell,
  .final-shell,
  .footer-shell {
    width: min(calc(100% - 28px), var(--shell));
  }

  body {
    padding-bottom: 72px;
  }

  .hero {
    padding: 64px 0 175px;
  }

  .hero h1 {
    font-size: clamp(43px, 13vw, 61px);
  }

  .hero-lead {
    font-size: 16px;
  }

  .hero-actions {
    display: grid;
  }

  .button {
    width: 100%;
  }

  .selector-wrap {
    margin-top: -125px;
  }

  .selector-heading {
    display: block;
    padding: 20px;
  }

  .selector-heading h2 {
    font-size: 22px;
  }

  .selector-heading > span {
    display: inline-flex;
    margin-top: 13px;
  }

  .device-switch button {
    min-height: 112px;
  }

  .client-panel {
    grid-template-columns: 1fr;
    padding: 22px 18px;
  }

  .client-identity {
    grid-template-columns: 60px 1fr;
  }

  .client-identity img {
    width: 60px;
    height: 60px;
    border-radius: 14px;
  }

  .client-identity h3 {
    font-size: 19px;
  }

  .client-data {
    border-top: 1px solid var(--line);
    border-left: 0;
    padding-top: 15px;
  }

  .client-data div:first-child {
    padding-left: 0;
  }

  .client-data div:last-child {
    padding-right: 0;
    border-right: 0;
  }

  .section {
    padding: 68px 0;
  }

  .section-heading h2,
  .requirements-heading h2,
  .steps-copy h2,
  .platform-heading h2,
  .help-heading h2,
  .faq-heading h2 {
    font-size: clamp(30px, 10vw, 40px);
  }

  .intro-copy .intro-lead {
    font-size: 19px;
  }

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

  .system-rule,
  .compatibility-note {
    grid-template-columns: 1fr;
    gap: 7px;
  }

  .requirements-head {
    display: none;
  }

  .requirements-table article {
    grid-template-columns: 1fr;
    padding: 17px;
  }

  .requirements-table article > * {
    padding: 8px 0;
    border-right: 0;
  }

  .requirements-table article > p {
    grid-column: auto;
    border-top: 1px solid var(--line);
  }

  .requirements-table article > span::before {
    display: inline-block;
    width: 80px;
    color: #948e9c;
    font-size: 9px;
  }

  .requirements-table article > span:nth-child(2)::before {
    content: "系统设备";
  }

  .requirements-table article > span:nth-child(3)::before {
    content: "最低内存";
  }

  .requirements-table article > span:nth-child(4)::before {
    content: "最低空间";
  }

  .steps-list li {
    grid-template-columns: 42px 1fr;
    gap: 14px;
  }

  .steps-list h3 {
    font-size: 18px;
  }

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

  .platform-grid article {
    min-height: 0;
  }

  .platform-grid h3 {
    margin-top: 30px;
  }

  .help-list article {
    grid-template-columns: 1fr;
    gap: 7px;
  }

  .help-list p {
    grid-column: auto;
  }

  .faq-list summary {
    font-size: 15px;
  }

  .final-section {
    padding-bottom: 70px;
  }

  .final-shell {
    padding: 38px 24px;
  }

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

  .mobile-download {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 120;
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 9px 14px;
    color: var(--white);
    background: rgba(16, 14, 29, 0.97);
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(16px);
  }

  .mobile-download > div {
    min-width: 0;
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .mobile-download img {
    width: 44px;
    height: 44px;
    border-radius: 11px;
  }

  .mobile-download small,
  .mobile-download strong {
    display: block;
    line-height: 1.2;
  }

  .mobile-download small {
    color: #7c758f;
    font-size: 10px;
  }

  .mobile-download strong {
    margin-top: 3px;
    font-size: 13px;
  }

  .mobile-download > a {
    flex: 0 0 auto;
    padding: 11px 15px;
    color: var(--night);
    background: var(--lime);
    font-size: 13px;
    font-weight: 900;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}