:root {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --surface-soft: #eceef1;
  --ink: #13151a;
  --muted: #626773;
  --line: #d9dce2;
  --dark: #111318;
  --dark-soft: #1a1d24;
  --accent: #d8ff36;
  --accent-ink: #111318;
  --danger: #ff5a5f;
  --container: 1180px;
  --shadow: 0 24px 70px rgba(17, 19, 24, 0.13);
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  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: 1.7;
  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;
}

.skip-link {
  position: fixed;
  z-index: 999;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  color: #fff;
  background: #000;
  transform: translateY(-160%);
}

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

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

.section-space {
  padding: 92px 0;
}

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.09);
  background: rgba(17, 19, 24, 0.94);
  backdrop-filter: blur(16px);
}

.header-inner {
  min-height: 76px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 34px;
}

.brand {
  display: inline-flex;
  align-items: center;
}

.brand img {
  width: 174px;
  height: 46px;
  object-fit: contain;
  object-position: left center;
}

.main-nav {
  display: flex;
  justify-content: center;
  gap: 30px;
  color: #c7cad1;
  font-size: 14px;
}

.main-nav a,
.footer-links a {
  transition: color 160ms ease;
}

.main-nav a:hover,
.main-nav a:focus-visible,
.footer-links a:hover,
.footer-links a:focus-visible {
  color: #fff;
}

.header-cta {
  padding: 10px 17px;
  border: 1px solid rgba(216, 255, 54, 0.45);
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
  transition: background 160ms ease, color 160ms ease;
}

.header-cta:hover,
.header-cta:focus-visible {
  color: var(--accent-ink);
  background: var(--accent);
}

.hero {
  position: relative;
  overflow: hidden;
  min-height: 690px;
  color: #fff;
  background:
    radial-gradient(circle at 76% 20%, rgba(216, 255, 54, 0.12), transparent 24%),
    linear-gradient(135deg, #111318 0%, #151820 58%, #0c0e12 100%);
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  pointer-events: none;
}

.hero::before {
  inset: 0;
  opacity: 0.22;
  background-image:
    linear-gradient(rgba(255,255,255,0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.045) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: linear-gradient(to bottom, #000, transparent 90%);
}

.hero::after {
  width: 480px;
  height: 480px;
  right: -270px;
  bottom: -240px;
  border: 70px solid rgba(216, 255, 54, 0.08);
  border-radius: 50%;
}

.hero-shell {
  position: relative;
  z-index: 1;
  min-height: 690px;
  display: grid;
  grid-template-columns: minmax(0, 1.03fr) minmax(430px, 0.97fr);
  align-items: center;
  gap: 76px;
  padding: 82px 0;
}

.eyebrow,
.section-kicker {
  margin: 0 0 16px;
  color: #7b818d;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #c8ccd4;
}

.eyebrow span {
  width: 24px;
  height: 2px;
  background: var(--accent);
}

.hero h1 {
  max-width: 680px;
  margin: 0;
  font-size: clamp(48px, 6.3vw, 84px);
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.hero-summary {
  max-width: 650px;
  margin: 28px 0 0;
  color: #b9bdc6;
  font-size: 17px;
  line-height: 1.9;
}

.hero-actions,
.final-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 12px 22px;
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 800;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}

.button:hover,
.button:focus-visible,
.device-action:hover,
.device-action:focus-visible,
.inline-button:hover,
.inline-button:focus-visible {
  transform: translateY(-2px);
}

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

.button-primary:hover,
.button-primary:focus-visible {
  background: #e3ff65;
}

.button-secondary,
.button-ghost {
  border-color: rgba(255, 255, 255, 0.22);
  color: #fff;
  background: rgba(255, 255, 255, 0.04);
}

.button-secondary:hover,
.button-secondary:focus-visible,
.button-ghost:hover,
.button-ghost:focus-visible {
  border-color: rgba(255, 255, 255, 0.45);
  background: rgba(255, 255, 255, 0.08);
}

.button svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.hero-facts {
  display: flex;
  gap: 0;
  margin: 48px 0 0;
  padding: 0;
  list-style: none;
}

.hero-facts li {
  min-width: 126px;
  padding: 0 24px;
  border-left: 1px solid rgba(255, 255, 255, 0.13);
}

.hero-facts li:first-child {
  padding-left: 0;
  border-left: 0;
}

.hero-facts strong,
.hero-facts span {
  display: block;
}

.hero-facts strong {
  color: #fff;
  font-size: 22px;
  line-height: 1.2;
}

.hero-facts span {
  margin-top: 4px;
  color: #818692;
  font-size: 12px;
}

.client-visual {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.13);
  background: rgba(22, 25, 32, 0.92);
  box-shadow: 0 40px 90px rgba(0, 0, 0, 0.4);
}

.client-visual::before {
  content: "";
  position: absolute;
  width: 160px;
  height: 160px;
  top: -80px;
  right: -80px;
  border-radius: 50%;
  background: rgba(216, 255, 54, 0.14);
  filter: blur(4px);
}

.visual-topbar,
.visual-footer {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.09);
  color: #8d929e;
  font-size: 11px;
}

.visual-title {
  color: #f2f3f5;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.visual-status {
  display: flex;
  align-items: center;
  gap: 7px;
}

.visual-status i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(216, 255, 54, 0.1);
}

.visual-body {
  position: relative;
  z-index: 1;
  padding: 34px 28px 30px;
}

.visual-brandmark {
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  color: var(--dark);
  background: var(--accent);
  font-size: 19px;
  font-weight: 950;
  letter-spacing: -0.08em;
}

.visual-heading {
  margin: 20px 0 16px;
  color: #f3f4f6;
  font-size: 18px;
  font-weight: 800;
}

.visual-platforms {
  display: grid;
  gap: 8px;
}

.visual-platform {
  display: grid;
  grid-template-columns: 36px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 13px 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.03);
  transition: border-color 160ms ease, background 160ms ease;
}

.visual-platform:hover,
.visual-platform:focus-visible,
.visual-platform.is-recommended {
  border-color: rgba(216, 255, 54, 0.48);
  background: rgba(216, 255, 54, 0.06);
}

.platform-symbol {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255,255,255,0.12);
  color: var(--accent);
  font-size: 15px;
}

.visual-platform b,
.visual-platform small {
  display: block;
}

.visual-platform b {
  color: #f1f2f4;
  font-size: 13px;
}

.visual-platform small {
  margin-top: 1px;
  color: #717783;
  font-size: 10px;
}

.visual-platform em {
  color: #aab0ba;
  font-size: 11px;
  font-style: normal;
}

.visual-footer {
  border-top: 1px solid rgba(255, 255, 255, 0.09);
  border-bottom: 0;
}

.visual-footer strong {
  color: var(--accent);
  font-weight: 700;
}

.quick-strip {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.quick-strip-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.quick-strip p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.quick-strip strong {
  color: var(--ink);
}

.text-link {
  white-space: nowrap;
  color: var(--ink);
  font-size: 14px;
  font-weight: 800;
}

.text-link span {
  color: #8f9500;
}

.intro-grid {
  display: grid;
  grid-template-columns: 0.84fr 1.16fr;
  gap: 90px;
  align-items: start;
}

.section-kicker {
  color: #747a85;
}

.intro-grid h2,
.section-heading h2,
.requirements-intro h2,
.faq-intro h2,
.final-cta h2 {
  margin: 0;
  font-size: clamp(32px, 4vw, 52px);
  line-height: 1.13;
  letter-spacing: -0.04em;
}

.intro-copy {
  padding-top: 28px;
  border-top: 2px solid var(--ink);
}

.intro-copy p {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
}

.intro-copy p + p {
  margin-top: 20px;
}

.devices-section {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.section-heading {
  display: grid;
  grid-template-columns: 1fr minmax(320px, 0.58fr);
  gap: 70px;
  align-items: end;
  margin-bottom: 42px;
}

.section-heading.compact {
  grid-template-columns: 1fr;
}

.section-heading > p,
.requirements-intro > p,
.faq-intro > p,
.final-cta p {
  margin: 0;
  color: var(--muted);
}

.device-list {
  border-top: 1px solid var(--ink);
}

.device-row {
  display: grid;
  grid-template-columns: 64px minmax(250px, 1fr) minmax(280px, 0.95fr) auto;
  align-items: center;
  gap: 24px;
  min-height: 126px;
  border-bottom: 1px solid var(--line);
}

.device-index {
  color: #959aa4;
  font-size: 12px;
  font-weight: 800;
}

.device-name {
  display: flex;
  align-items: center;
  gap: 18px;
}

.device-name > span {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  color: var(--ink);
  background: var(--surface-soft);
  font-weight: 900;
}

.device-name h3,
.device-name p,
.device-check b,
.device-check span {
  margin: 0;
}

.device-name h3 {
  font-size: 17px;
  line-height: 1.3;
}

.device-name p,
.device-check span {
  color: var(--muted);
  font-size: 12px;
}

.device-check b,
.device-check span {
  display: block;
}

.device-check b {
  font-size: 11px;
  letter-spacing: 0.08em;
}

.device-action,
.inline-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 16px;
  color: var(--ink);
  border: 1px solid var(--ink);
  font-size: 13px;
  font-weight: 800;
  transition: transform 160ms ease, background 160ms ease, color 160ms ease;
}

.device-action:hover,
.device-action:focus-visible,
.inline-button:hover,
.inline-button:focus-visible {
  color: #fff;
  background: var(--ink);
}

.requirements-section {
  background: #e9ebee;
}

.requirements-grid {
  display: grid;
  grid-template-columns: minmax(280px, 0.72fr) minmax(0, 1.28fr);
  gap: 86px;
  align-items: start;
}

.requirements-intro {
  position: sticky;
  top: 112px;
}

.requirements-intro > p {
  margin-top: 24px;
}

.inline-button {
  margin-top: 30px;
}

.requirements-panel {
  border-top: 1px solid var(--ink);
}

.requirement-item {
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: 24px;
  padding: 30px 0;
  border-bottom: 1px solid #c9ccd2;
}

.requirement-number {
  color: #8b9099;
  font-size: 12px;
  font-weight: 800;
}

.requirement-item h3,
.requirement-item p {
  margin: 0;
}

.requirement-item h3 {
  font-size: 19px;
}

.requirement-item p {
  margin-top: 7px;
  color: var(--muted);
}

.steps-section {
  background: var(--dark);
  color: #fff;
}

.steps-section .section-kicker {
  color: #9096a1;
}

.steps-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin: 48px 0 0;
  padding: 1px;
  background: rgba(255, 255, 255, 0.13);
  list-style: none;
}

.steps-list li {
  min-height: 260px;
  padding: 32px;
  background: var(--dark);
}

.step-number {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  color: var(--dark);
  background: var(--accent);
  font-weight: 900;
}

.steps-list h3,
.steps-list p {
  margin: 0;
}

.steps-list h3 {
  margin-top: 52px;
  font-size: 20px;
}

.steps-list p {
  margin-top: 10px;
  color: #9ba0aa;
}

.faq-grid {
  display: grid;
  grid-template-columns: minmax(280px, 0.74fr) minmax(0, 1.26fr);
  gap: 86px;
}

.faq-intro p:last-child {
  margin-top: 24px;
}

.faq-list {
  border-top: 1px solid var(--ink);
}

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

.faq-list summary {
  position: relative;
  padding: 24px 50px 24px 0;
  cursor: pointer;
  font-size: 17px;
  font-weight: 800;
  list-style: none;
}

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

.faq-list summary span {
  position: absolute;
  right: 0;
  top: 23px;
  color: #7e838d;
  font-size: 22px;
  font-weight: 400;
  transition: transform 160ms ease;
}

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

.faq-list details p {
  margin: -4px 0 24px;
  padding-right: 42px;
  color: var(--muted);
}

.final-cta {
  padding: 82px 0;
  color: #fff;
  background: linear-gradient(115deg, #151820 0%, #111318 65%, #20251a 100%);
}

.final-cta-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 60px;
  align-items: center;
}

.final-cta .section-kicker {
  color: var(--accent);
}

.final-cta h2 {
  max-width: 720px;
}

.final-cta p {
  margin-top: 14px;
  color: #a9aeb7;
}

.final-actions {
  margin-top: 0;
  justify-content: flex-end;
}

.site-footer {
  color: #c8cbd2;
  background: #0b0d10;
}

.footer-main {
  min-height: 170px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 50px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand img {
  width: 156px;
  height: 42px;
  object-fit: contain;
  object-position: left center;
}

.footer-brand p {
  margin: 12px 0 0;
  color: #727884;
  font-size: 13px;
}

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

.footer-legal {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  padding-top: 24px;
  padding-bottom: 28px;
  color: #696f79;
  font-size: 11px;
}

.footer-legal p {
  max-width: 560px;
  margin: 0;
}

:focus-visible {
  outline: 3px solid rgba(216, 255, 54, 0.75);
  outline-offset: 3px;
}

@media (max-width: 980px) {
  .main-nav {
    display: none;
  }

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

  .hero-shell {
    grid-template-columns: 1fr;
    gap: 58px;
  }

  .hero-copy {
    max-width: 760px;
  }

  .client-visual {
    max-width: 680px;
  }

  .intro-grid,
  .requirements-grid,
  .faq-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .requirements-intro {
    position: static;
  }

  .device-row {
    grid-template-columns: 54px minmax(0, 1fr) auto;
  }

  .device-check {
    display: none;
  }

  .steps-list {
    grid-template-columns: 1fr;
  }

  .steps-list li {
    min-height: 0;
  }

  .steps-list h3 {
    margin-top: 30px;
  }

  .final-cta-inner {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .final-actions {
    justify-content: flex-start;
  }
}

@media (max-width: 720px) {
  .section-shell,
  .header-inner,
  .hero-shell {
    width: min(calc(100% - 28px), var(--container));
  }

  .section-space {
    padding: 68px 0;
  }

  .site-header {
    position: relative;
  }

  .header-inner {
    min-height: 68px;
  }

  .brand img {
    width: 142px;
    height: 40px;
  }

  .header-cta {
    padding: 8px 12px;
    font-size: 12px;
  }

  .hero,
  .hero-shell {
    min-height: auto;
  }

  .hero-shell {
    padding: 64px 0 58px;
    gap: 46px;
  }

  .hero h1 {
    font-size: clamp(43px, 14vw, 64px);
  }

  .hero-summary {
    font-size: 15px;
  }

  .hero-actions,
  .final-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .button {
    width: 100%;
  }

  .hero-facts {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
  }

  .hero-facts li {
    min-width: 0;
    padding: 0 12px;
  }

  .hero-facts strong {
    font-size: 17px;
  }

  .visual-topbar,
  .visual-footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
  }

  .visual-body {
    padding: 26px 18px 22px;
  }

  .quick-strip-inner {
    align-items: flex-start;
    flex-direction: column;
    padding-top: 18px;
    padding-bottom: 18px;
  }

  .intro-grid h2,
  .section-heading h2,
  .requirements-intro h2,
  .faq-intro h2,
  .final-cta h2 {
    font-size: 34px;
  }

  .section-heading {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .device-row {
    grid-template-columns: 34px 1fr;
    gap: 12px;
    padding: 24px 0;
  }

  .device-name {
    gap: 12px;
  }

  .device-name > span {
    width: 40px;
    height: 40px;
  }

  .device-action {
    grid-column: 2;
    width: 100%;
  }

  .requirement-item {
    grid-template-columns: 42px 1fr;
    gap: 14px;
  }

  .steps-list li {
    padding: 26px;
  }

  .faq-list details p {
    padding-right: 0;
  }

  .final-cta {
    padding: 68px 0;
  }

  .footer-main,
  .footer-legal {
    align-items: flex-start;
    flex-direction: column;
  }

  .footer-main {
    padding-top: 46px;
    padding-bottom: 38px;
  }

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

  .footer-legal {
    padding-top: 24px;
    padding-bottom: 30px;
  }
}

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

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