@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;600;700;800;900&display=swap");

:root {
  --ink: #171525;
  --muted: #696579;
  --paper: #fbfaf6;
  --violet: #6c4ff8;
  --pink: #ed3f8d;
  --blue: #3389ff;
  --soft-violet: #eeeafd;
  --soft-pink: #fff0f6;
  --soft-blue: #eaf5ff;
  --content: 1220px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 12% 4%, rgba(108, 79, 248, .11), transparent 25rem),
    radial-gradient(circle at 93% 17%, rgba(237, 63, 141, .10), transparent 28rem),
    var(--paper);
  color: var(--ink);
  font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  overflow-x: hidden;
}

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

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

.topbar {
  width: min(calc(100% - 44px), var(--content));
  min-height: 92px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 48px;
  position: relative;
  z-index: 20;
}

.wordmark,
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -.03em;
}

.wordmark img,
.footer-brand img {
  width: 38px;
  height: 38px;
  object-fit: contain;
}

.topnav {
  display: flex;
  justify-content: center;
  gap: 34px;
  font-size: 14px;
  font-weight: 600;
  color: #514d62;
}

.topnav a {
  transition: color .2s ease, transform .2s ease;
}

.topnav a:hover {
  color: var(--violet);
  transform: translateY(-2px);
}

.top-download,
.main-action,
.install-download,
.closing a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--ink);
  color: #fff;
  font-weight: 800;
  border-radius: 999px;
  transition: transform .2s ease, box-shadow .2s ease;
}

.top-download {
  min-height: 46px;
  padding: 0 23px;
  font-size: 14px;
}

.top-download:hover,
.main-action:hover,
.install-download:hover,
.closing a:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 35px rgba(23, 21, 37, .18);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  color: var(--ink);
  font-size: 20px;
  cursor: pointer;
}

.opening {
  width: min(calc(100% - 44px), 1380px);
  min-height: 720px;
  margin: 18px auto 90px;
  display: grid;
  grid-template-columns: .88fr 1.12fr;
  align-items: center;
  gap: 58px;
  position: relative;
}

.opening::before {
  content: "";
  position: absolute;
  width: 620px;
  height: 620px;
  right: -165px;
  top: 32px;
  background: radial-gradient(circle, rgba(51, 137, 255, .18), rgba(237, 63, 141, .08) 48%, transparent 70%);
  border-radius: 50%;
  filter: blur(6px);
  pointer-events: none;
}

.opening-copy {
  padding-left: clamp(0px, 3vw, 60px);
  position: relative;
  z-index: 2;
}

.eyebrow,
.section-kicker {
  margin: 0 0 22px;
  color: var(--violet);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.eyebrow span {
  display: inline-block;
  margin-right: 14px;
  padding: 7px 13px;
  background: var(--soft-violet);
  border-radius: 999px;
  letter-spacing: .05em;
}

.opening h1 {
  max-width: 650px;
  margin: 0;
  font-size: clamp(58px, 6.8vw, 104px);
  line-height: .98;
  letter-spacing: -.075em;
  font-weight: 900;
}

.opening-text {
  max-width: 610px;
  margin: 34px 0 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.95;
}

.opening-actions {
  margin-top: 38px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 24px;
}

.main-action {
  min-height: 58px;
  padding: 0 31px;
  font-size: 16px;
}

.guide-action {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 800;
}

.guide-action i {
  transition: transform .2s ease;
}

.guide-action:hover i {
  transform: translateX(5px);
}

.opening-note {
  margin: 24px 0 0;
  color: #797487;
  font-size: 13px;
}

.opening-note i {
  margin-right: 8px;
  color: #2ba66a;
}

.opening-image {
  margin: 0;
  position: relative;
  z-index: 1;
  transform: translateX(4%);
}

.opening-image img {
  width: 100%;
  max-height: 660px;
  object-fit: cover;
  object-position: center;
  clip-path: polygon(8% 2%, 100% 0, 96% 88%, 72% 100%, 0 92%, 3% 14%);
  filter: drop-shadow(0 35px 45px rgba(49, 39, 83, .16));
}

.download-stage,
.product-story,
.release-stage,
.install-stage,
.trust-stage,
.safety-stage,
.faq-stage {
  width: min(calc(100% - 44px), var(--content));
  margin-left: auto;
  margin-right: auto;
}

.download-stage {
  padding: 95px 0 120px;
}

.stage-intro {
  max-width: 750px;
}

.stage-intro h2,
.story-copy h2,
.release-title h2,
.install-heading h2,
.trust-copy h2,
.safety-copy h2,
.faq-heading h2 {
  margin: 0;
  font-size: clamp(42px, 5vw, 72px);
  line-height: 1.12;
  letter-spacing: -.055em;
  font-weight: 900;
}

.stage-intro > p:last-child,
.release-title > p:last-child,
.trust-copy > p:last-child,
.safety-copy > p:last-child {
  max-width: 700px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.9;
}

.systems {
  margin-top: 76px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 48px;
}

.systems article {
  min-width: 0;
}

.systems article > i {
  font-size: 33px;
  color: var(--violet);
}

.systems h3 {
  margin: 24px 0 12px;
  font-size: 25px;
  letter-spacing: -.025em;
}

.systems p {
  min-height: 88px;
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
}

.systems a {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-top: 21px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 800;
}

.systems a i {
  transition: transform .2s ease;
}

.systems a:hover i {
  transform: translateX(5px);
}

.product-story {
  padding: 130px 0;
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  align-items: center;
  gap: 110px;
  position: relative;
}

.product-story::before {
  content: "";
  position: absolute;
  inset: 4% 42% 7% -20vw;
  background: linear-gradient(135deg, var(--soft-blue), var(--soft-violet) 70%, transparent);
  border-radius: 0 55% 55% 0;
  z-index: -1;
}

.story-image img {
  width: 100%;
  max-width: 560px;
  margin: 0 auto;
  filter: drop-shadow(0 32px 35px rgba(74, 66, 111, .14));
}

.story-copy h2 {
  max-width: 710px;
}

.story-point {
  margin-top: 40px;
  display: grid;
  grid-template-columns: 55px 1fr;
  gap: 22px;
}

.story-point > strong {
  color: var(--pink);
  font-size: 13px;
  letter-spacing: .12em;
}

.story-point h3 {
  margin: 0 0 10px;
  font-size: 21px;
}

.story-point p {
  margin: 0;
  color: var(--muted);
  line-height: 1.85;
}

.release-stage {
  padding: 130px 0;
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 100px;
  align-items: start;
}

.release-content {
  padding-top: 22px;
}

.release-number {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 18px;
  align-items: end;
}

.release-number span {
  color: var(--pink);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: .14em;
}

.release-number strong {
  grid-row: span 2;
  color: var(--violet);
  font-size: clamp(72px, 10vw, 150px);
  line-height: .85;
  letter-spacing: -.08em;
}

.release-number em {
  color: var(--muted);
  font-size: 13px;
  font-style: normal;
}

.release-content ul {
  margin: 48px 0 0;
  padding: 0;
  display: grid;
  gap: 25px;
  list-style: none;
}

.release-content li {
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: 15px;
  color: var(--muted);
  line-height: 1.75;
}

.release-content li i {
  margin-top: 5px;
  color: #2ba66a;
}

.release-content li b {
  display: block;
  margin-bottom: 4px;
  color: var(--ink);
}

.install-stage {
  padding: 135px 0;
}

.install-heading {
  max-width: 700px;
}

.install-flow {
  margin: 84px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 70px;
  list-style: none;
}

.install-flow li {
  position: relative;
}

.install-flow span {
  display: block;
  margin-bottom: 32px;
  color: rgba(108, 79, 248, .18);
  font-size: 104px;
  line-height: .75;
  font-weight: 900;
  letter-spacing: -.08em;
}

.install-flow h3 {
  margin: 0 0 14px;
  font-size: 23px;
}

.install-flow p {
  margin: 0;
  color: var(--muted);
  line-height: 1.85;
}

.install-download {
  min-height: 58px;
  margin-top: 58px;
  padding: 0 30px;
}

.trust-stage {
  margin-top: 70px;
  margin-bottom: 110px;
  padding: 105px 8vw;
  background:
    radial-gradient(circle at 20% 30%, rgba(255,255,255,.18), transparent 14rem),
    linear-gradient(125deg, #1a1830, #382e71 55%, #6d3a78);
  color: #fff;
  border-radius: 54% 46% 50% 50% / 14% 16% 12% 15%;
}

.trust-copy {
  max-width: 750px;
}

.trust-copy .section-kicker {
  color: #bfb4ff;
}

.trust-copy > p:last-child {
  color: rgba(255,255,255,.68);
}

.trust-numbers {
  margin-top: 80px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
}

.trust-numbers strong {
  display: block;
  font-size: clamp(45px, 5vw, 72px);
  line-height: 1;
  letter-spacing: -.06em;
}

.trust-numbers strong span {
  font-size: .42em;
  letter-spacing: -.02em;
}

.trust-numbers p {
  margin: 13px 0 0;
  color: rgba(255,255,255,.7);
  font-size: 14px;
}

.safety-stage {
  padding: 120px 0 135px;
  display: grid;
  grid-template-columns: 1fr .92fr;
  column-gap: 90px;
  align-items: start;
  position: relative;
}

.safety-copy {
  max-width: 650px;
}

.safety-list {
  margin-top: 48px;
  display: grid;
  gap: 28px;
}

.safety-list p {
  margin: 0;
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 17px;
  color: var(--muted);
  line-height: 1.8;
}

.safety-list i {
  margin-top: 5px;
  color: var(--violet);
}

.safety-list b {
  display: block;
  margin-bottom: 3px;
  color: var(--ink);
}

.safety-stage > img {
  grid-column: 2;
  grid-row: 1 / span 2;
  width: min(100%, 520px);
  justify-self: end;
  align-self: center;
  clip-path: circle(47% at 50% 50%);
  filter: drop-shadow(0 28px 42px rgba(50, 43, 83, .16));
}

.faq-stage {
  padding: 110px 0 145px;
  display: grid;
  grid-template-columns: .78fr 1.22fr;
  gap: 115px;
  align-items: start;
}

.faq-heading {
  position: sticky;
  top: 95px;
}

.faq-items {
  display: grid;
  gap: 34px;
}

.faq-items details {
  padding: 0;
}

.faq-items summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  color: var(--ink);
  font-size: 20px;
  font-weight: 800;
  line-height: 1.5;
  cursor: pointer;
  list-style: none;
}

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

.faq-items summary i {
  margin-top: 7px;
  color: var(--violet);
  font-size: 14px;
  transition: transform .2s ease;
}

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

.faq-items p {
  max-width: 760px;
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.85;
}

.closing {
  min-height: 520px;
  padding: 95px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  background:
    radial-gradient(circle at 20% 20%, rgba(255,255,255,.8), transparent 15rem),
    linear-gradient(135deg, #e9f6ff, #f5ebff 48%, #ffe8f2);
}

.closing > p {
  margin: 0 0 18px;
  color: var(--violet);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: .15em;
}

.closing h2 {
  max-width: 900px;
  margin: 0;
  font-size: clamp(48px, 7vw, 94px);
  line-height: 1;
  letter-spacing: -.07em;
  font-weight: 900;
}

.closing a {
  min-height: 62px;
  margin-top: 40px;
  padding: 0 34px;
  font-size: 17px;
}

.closing > span {
  margin-top: 20px;
  color: #6d6678;
  font-size: 13px;
  letter-spacing: .08em;
}

.footer {
  width: min(calc(100% - 44px), var(--content));
  min-height: 128px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 38px;
  color: #716c7e;
  font-size: 13px;
}

.footer-brand {
  color: var(--ink);
  font-size: 18px;
}

.footer-brand img {
  width: 31px;
  height: 31px;
}

@media (max-width: 1020px) {
  .topnav {
    display: none;
    position: fixed;
    inset: 76px 0 auto;
    width: 100%;
    padding: 34px 24px 38px;
    align-items: center;
    flex-direction: column;
    gap: 24px;
    background: rgba(251,250,246,.98);
    backdrop-filter: blur(18px);
  }

  .topnav.is-open {
    display: flex;
  }

  .nav-toggle {
    display: inline-grid;
    place-items: center;
  }

  .top-download {
    justify-self: end;
  }

  .topbar {
    grid-template-columns: auto 1fr auto auto;
    gap: 16px;
  }

  .opening {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 50px;
  }

  .opening-copy {
    max-width: 780px;
  }

  .opening-image {
    max-width: 850px;
    margin: 0 auto;
    transform: none;
  }

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

  .product-story,
  .release-stage,
  .safety-stage,
  .faq-stage {
    grid-template-columns: 1fr;
    gap: 70px;
  }

  .product-story::before {
    inset: 3% 22% 52% -30vw;
  }

  .story-image {
    order: 2;
  }

  .safety-stage > img {
    grid-column: 1;
    grid-row: auto;
    justify-self: center;
  }

  .faq-heading {
    position: static;
  }

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

@media (max-width: 720px) {
  .topbar {
    width: min(calc(100% - 28px), var(--content));
    min-height: 76px;
  }

  .top-download {
    display: none;
  }

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

  .opening,
  .download-stage,
  .product-story,
  .release-stage,
  .install-stage,
  .trust-stage,
  .safety-stage,
  .faq-stage,
  .footer {
    width: min(calc(100% - 30px), var(--content));
  }

  .opening {
    margin-top: 0;
    margin-bottom: 45px;
    gap: 42px;
  }

  .opening-copy {
    padding-left: 0;
  }

  .eyebrow {
    line-height: 1.8;
  }

  .eyebrow span {
    display: table;
    margin: 0 0 6px;
  }

  .opening h1 {
    font-size: clamp(52px, 16vw, 72px);
  }

  .opening-text {
    margin-top: 25px;
    font-size: 16px;
    line-height: 1.85;
  }

  .opening-actions {
    align-items: stretch;
    flex-direction: column;
    gap: 18px;
  }

  .main-action {
    width: 100%;
  }

  .guide-action {
    justify-content: center;
  }

  .opening-image img {
    min-height: 270px;
    object-fit: cover;
    clip-path: polygon(6% 2%, 100% 0, 96% 90%, 70% 100%, 0 93%, 3% 14%);
  }

  .download-stage,
  .product-story,
  .release-stage,
  .install-stage,
  .safety-stage,
  .faq-stage {
    padding-top: 82px;
    padding-bottom: 90px;
  }

  .systems {
    margin-top: 55px;
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .systems p {
    min-height: 0;
  }

  .product-story {
    gap: 45px;
  }

  .product-story::before {
    inset: 54% -10vw 3% -20vw;
    border-radius: 50% 0 0 50%;
  }

  .story-point {
    grid-template-columns: 40px 1fr;
  }

  .release-stage {
    gap: 45px;
  }

  .release-number {
    grid-template-columns: auto 1fr;
  }

  .release-number strong {
    font-size: 82px;
  }

  .install-flow {
    margin-top: 60px;
    grid-template-columns: 1fr;
    gap: 55px;
  }

  .install-flow span {
    font-size: 76px;
    margin-bottom: 20px;
  }

  .install-download {
    width: 100%;
  }

  .trust-stage {
    margin-top: 30px;
    margin-bottom: 60px;
    padding: 78px 30px;
    border-radius: 45% 55% 48% 52% / 5% 6% 5% 6%;
  }

  .trust-numbers {
    margin-top: 58px;
    grid-template-columns: 1fr 1fr;
    gap: 36px 20px;
  }

  .trust-numbers strong {
    font-size: 44px;
  }

  .safety-stage {
    gap: 45px;
  }

  .faq-stage {
    gap: 52px;
  }

  .faq-items summary {
    font-size: 18px;
  }

  .closing {
    min-height: 430px;
    padding: 75px 20px;
  }

  .closing h2 {
    font-size: clamp(46px, 14vw, 68px);
  }

  .footer {
    padding: 36px 0;
    grid-template-columns: 1fr;
    gap: 13px;
    text-align: center;
  }

  .footer-brand {
    justify-content: center;
  }
}

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

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}