:root {
  --canvas: #f7fbff;
  --surface: #ffffff;
  --surface-blue: #edf6ff;
  --ink: #102449;
  --ink-strong: #073a91;
  --muted: #53647e;
  --line: #cddff2;
  --blue: #075ee8;
  --blue-deep: #0449ba;
  --violet: #6537e8;
  --focus: #ffb000;
  --shadow: 0 18px 42px rgba(21, 75, 137, .18);
  color-scheme: light;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--canvas);
  font-family: "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; }
svg { display: block; }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 99;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  color: #fff;
  background: var(--blue-deep);
  transform: translateY(-180%);
}

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

.site-header {
  position: relative;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1420px, calc(100% - 48px));
  min-height: 74px;
  margin: 0 auto;
  border-bottom: 1px solid rgba(130, 168, 209, .35);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  color: #0b4ec2;
  font-size: 20px;
  font-weight: 750;
  letter-spacing: -.02em;
}

.brand b { color: var(--ink); font-weight: 680; }
.brand > span:not(.brand-mark) { color: #8ca1ba; font-weight: 500; }

.brand-mark {
  position: relative;
  width: 31px;
  height: 31px;
  border-radius: 10px 13px 9px 14px;
  background: var(--blue);
  transform: rotate(-7deg);
  box-shadow: 0 8px 16px rgba(7, 94, 232, .22);
}

.brand-mark i {
  position: absolute;
  width: 11px;
  height: 4px;
  border-radius: 99px;
  background: #fff;
  transform: rotate(7deg);
}

.brand-mark i:first-child { top: 9px; left: 8px; }
.brand-mark i:last-child { top: 17px; left: 12px; }

.site-header nav {
  display: flex;
  align-items: center;
  gap: 26px;
}

.site-header nav a,
.site-header nav button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  color: #18467f;
  font-size: 16px;
  font-weight: 650;
}

.site-header nav a:hover { color: var(--blue); }

.site-header nav button {
  gap: 8px;
  padding: 0;
  border: 0;
  color: var(--ink);
  background: transparent;
  cursor: pointer;
}

.site-header nav button svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
}

.download-hero {
  position: relative;
  isolation: isolate;
  display: grid;
  align-items: center;
  min-height: 720px;
  padding: 54px 24px 64px;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 24%, rgba(255, 255, 255, .96) 0 22%, rgba(247, 251, 255, .74) 48%, rgba(223, 240, 255, .88) 100%),
    linear-gradient(180deg, #f8fcff 0%, #edf7ff 100%);
}

.download-hero::before,
.download-hero::after {
  content: "";
  position: absolute;
  z-index: -2;
  width: 680px;
  height: 680px;
  border: 1px solid rgba(86, 168, 234, .25);
  border-radius: 48% 52% 54% 46%;
  transform: rotate(24deg);
}

.download-hero::before { left: -420px; top: 65px; }
.download-hero::after { right: -420px; top: 90px; transform: rotate(-28deg); }

.orbit {
  position: absolute;
  z-index: -1;
  width: 540px;
  height: 180px;
  border-top: 1px solid rgba(7, 94, 232, .17);
  border-radius: 50%;
  filter: blur(.1px);
}

.orbit-a { left: -160px; bottom: 95px; transform: rotate(18deg); }
.orbit-b { right: -160px; bottom: 105px; transform: rotate(-18deg); }

.hero-content {
  width: min(1180px, 100%);
  margin: 0 auto;
  text-align: center;
}

.hero-content h1 {
  max-width: 1000px;
  margin: 0 auto;
  color: #0b469f;
  font-size: clamp(42px, 5vw, 70px);
  line-height: 1.1;
  letter-spacing: -.035em;
  text-wrap: balance;
}

.hero-summary {
  max-width: 900px;
  margin: 22px auto 0;
  color: #3c4e68;
  font-size: clamp(18px, 1.7vw, 22px);
  line-height: 1.6;
  text-wrap: balance;
}

.benefits {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 18px 40px;
  margin: 29px 0 0;
  padding: 0;
  list-style: none;
}

.benefits li {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: #183b69;
  font-size: 16px;
  font-weight: 640;
}

.benefits svg {
  width: 21px;
  height: 21px;
  fill: none;
  stroke: var(--blue);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.download-action {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 32px;
}

.main-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  min-width: min(460px, 100%);
  min-height: 76px;
  margin-top: 0;
  padding: 13px 28px;
  border-radius: 14px;
  color: #fff;
  background: linear-gradient(135deg, var(--blue-deep), #087fe3);
  box-shadow: 0 13px 30px rgba(0, 84, 197, .28);
  transition: transform .18s ease-out, box-shadow .18s ease-out, filter .18s ease-out;
}

.main-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 17px 36px rgba(0, 84, 197, .34);
  filter: saturate(1.08);
}

.main-download svg { width: 38px; height: 38px; fill: currentColor; flex: 0 0 auto; }
.main-download span { display: grid; gap: 1px; text-align: left; }
.main-download strong { font-size: 24px; line-height: 1.35; }
.main-download small { color: #dfeeff; font-size: 14px; font-weight: 560; }

.download-status {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  max-width: 238px;
  margin: 0;
  color: #20456f;
  text-align: left;
}

.download-status strong,
.download-status small { display: block; }
.download-status strong { color: #164f3b; font-size: 15px; line-height: 1.45; }
.download-status small { margin-top: 2px; color: var(--muted); font-size: 13px; line-height: 1.5; }

.download-status__pulse {
  position: relative;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #168764;
  box-shadow: 0 4px 12px rgba(22, 135, 100, .24);
}

.download-status__pulse::after {
  content: "";
  position: absolute;
  inset: -5px;
  border: 1px solid rgba(22, 135, 100, .4);
  border-radius: inherit;
  animation: download-channel-pulse 1.8s cubic-bezier(.16, 1, .3, 1) 3;
}

.download-status.is-demo {
  padding: 10px 13px;
  border: 1px solid #b9ccec;
  border-radius: 12px;
  background: #f3f6ff;
}

.download-status.is-demo strong { color: #4c2db4; font-variant-numeric: tabular-nums; }
.download-status.is-demo .download-status__pulse { background: var(--violet); }
.download-status.is-demo .download-status__pulse::after { border-color: rgba(101, 55, 232, .38); }
.download-status.is-counting strong { animation: demo-number-pop .24s ease-out; }

@keyframes download-channel-pulse {
  from { opacity: .85; transform: scale(.55); }
  to { opacity: 0; transform: scale(1.45); }
}

@keyframes demo-number-pop {
  0% { opacity: .72; transform: translateY(2px); }
  100% { opacity: 1; transform: translateY(0); }
}

.release-facts {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 15px;
}

.release-facts span { padding: 0 6px; color: #9bb0c8; }

.alternative-downloads {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 19px;
  margin-top: 10px;
  color: var(--blue-deep);
  font-size: 15px;
  font-weight: 650;
}

.alternative-downloads > span { width: 1px; height: 18px; background: #a8bdd4; }
.alternative-downloads a { min-height: 44px; display: inline-flex; align-items: center; }
.alternative-downloads a:hover { text-decoration: underline; text-underline-offset: 4px; }

.install-strip {
  margin: 27px auto 0;
  padding-top: 18px;
  border-top: 1px solid rgba(136, 172, 211, .42);
}

.install-strip h2 {
  display: inline-block;
  position: relative;
  margin: -36px auto 10px;
  padding: 0 22px;
  color: #153e7c;
  background: #f4faff;
  font-size: 20px;
  line-height: 1.5;
}

.install-strip ol {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 0;
  padding: 19px 20px;
  border: 1px solid rgba(137, 175, 215, .42);
  border-radius: 16px;
  background: rgba(255, 255, 255, .72);
  box-shadow: 0 13px 32px rgba(48, 107, 164, .08);
  list-style: none;
}

.install-strip li {
  position: relative;
  display: grid;
  grid-template-columns: 30px 46px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  min-height: 70px;
  padding: 0 22px;
  text-align: left;
}

.install-strip li + li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: #c8d9ec;
}

.step-number {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  color: var(--blue-deep);
  background: #dceaff;
  font-size: 14px;
  font-weight: 800;
}

.install-strip li > svg {
  width: 44px;
  height: 44px;
  padding: 8px;
  border: 1px solid #bdd3eb;
  border-radius: 10px;
  fill: none;
  stroke: var(--blue-deep);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
  background: #f8fbff;
}

.install-strip strong { color: #142c51; font-size: 17px; }
.install-strip p { margin: 1px 0 0; color: var(--muted); font-size: 14px; line-height: 1.45; }

.download-note {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 14px 0 0;
  color: #50637c;
  font-size: 14px;
}

.download-note svg {
  width: 19px;
  height: 19px;
  fill: none;
  stroke: #3970ad;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.beginner-entry {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr) auto;
  gap: 28px;
  align-items: center;
  width: min(1240px, calc(100% - 48px));
  margin: 72px auto 0;
  padding: 28px 30px;
  border: 1px solid #bdd2ec;
  border-left: 5px solid var(--violet);
  border-radius: 16px;
  background: linear-gradient(115deg, #eef5ff 0%, #fff 60%);
  box-shadow: 0 16px 36px rgba(44, 78, 132, .1);
}

.beginner-entry__index {
  color: #6641d5;
  font-size: 24px;
  font-weight: 850;
  letter-spacing: .04em;
}

.beginner-entry__eyebrow {
  margin: 0 0 3px;
  color: var(--blue);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .08em;
}

.beginner-entry h2 { margin: 0; color: #133b75; font-size: 25px; line-height: 1.3; }
.beginner-entry div > p:last-child { max-width: 62ch; margin: 7px 0 0; color: var(--muted); font-size: 16px; }
.beginner-entry > a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 10px 18px;
  border-radius: 11px;
  color: #fff;
  background: var(--violet);
  font-size: 16px;
  font-weight: 760;
  white-space: nowrap;
}

.beginner-entry > a:hover { background: #5128cf; }

.product-proof {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: 64px;
  align-items: center;
  width: min(1240px, calc(100% - 48px));
  margin: 0 auto;
  padding: 96px 0;
}

.proof-copy h2 {
  margin: 0;
  color: #123b76;
  font-size: clamp(30px, 3vw, 46px);
  line-height: 1.2;
  letter-spacing: -.025em;
}

.proof-copy > p {
  max-width: 46ch;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 17px;
}

.proof-links {
  display: grid;
  gap: 0;
  margin-top: 30px;
  border-top: 1px solid var(--line);
}

.proof-links a {
  display: grid;
  gap: 3px;
  padding: 17px 34px 17px 0;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, transparent, transparent);
}

.proof-links a:hover strong { color: var(--blue); }
.proof-links strong { color: #113b76; font-size: 17px; }
.proof-links span { color: var(--muted); font-size: 14px; }

.product-proof figure { margin: 0; }

.product-proof img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 16px;
  box-shadow: var(--shadow);
}

.product-proof figcaption {
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
  text-align: right;
}

.publisher-boundary {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 32px;
  width: min(1240px, calc(100% - 48px));
  margin: 0 auto 72px;
  padding: 30px 0;
  border-top: 1px solid #c7daee;
  border-bottom: 1px solid #c7daee;
}

.publisher-boundary h2 { margin: 0; color: #143c76; font-size: 22px; }
.publisher-boundary p { margin: 0; color: var(--muted); }

footer {
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 76px;
  padding: 0 max(24px, calc((100vw - 1240px) / 2));
  color: #60718a;
  background: #eef5fc;
  font-size: 14px;
}

footer a { min-height: 44px; display: inline-flex; align-items: center; }
footer a:first-child { color: var(--violet); font-weight: 750; }
footer span { margin-left: auto; }

.share-card {
  display: grid;
  grid-template-columns: minmax(240px, .75fr) minmax(0, 1.25fr);
  gap: 38px;
  align-items: center;
  width: min(1240px, calc(100% - 48px));
  margin: 0 auto 52px;
  padding: 30px 34px;
  border: 1px solid #bfd6ee;
  border-radius: 16px;
  background: linear-gradient(135deg, #edf6ff, #fff);
  box-shadow: 0 14px 34px rgba(36, 93, 154, .1);
  scroll-margin-top: 24px;
}

.share-card__eyebrow {
  margin: 0 0 6px;
  color: var(--blue);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .08em;
}

.share-card h2 { margin: 0; color: #123b76; font-size: 24px; line-height: 1.3; }
.share-card div > p:last-child { margin: 10px 0 0; color: var(--muted); font-size: 15px; }

.share-card pre {
  margin: 0;
  padding: 18px 20px;
  overflow: auto;
  border: 1px solid #c8daed;
  border-radius: 12px;
  color: #17375f;
  background: #fff;
  font: 600 15px/1.7 "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  white-space: pre-wrap;
  user-select: text;
}

@media (max-width: 900px) {
  .site-header { width: calc(100% - 32px); }
  .brand > span:not(.brand-mark), .brand b { display: none; }
  .site-header nav { gap: 16px; }
  .site-header nav a:nth-child(2) { display: none; }
  .download-hero { min-height: auto; padding-top: 48px; }
  .install-strip ol { grid-template-columns: 1fr; padding: 10px 18px; }
  .install-strip li { padding: 15px 4px; }
  .install-strip li + li::before { top: 0; right: 0; bottom: auto; width: auto; height: 1px; }
  .product-proof { grid-template-columns: 1fr; gap: 38px; }
  .beginner-entry { grid-template-columns: 86px minmax(0, 1fr); }
  .beginner-entry > a { grid-column: 2; justify-self: start; }
  .proof-copy > p { max-width: none; }
  .share-card { grid-template-columns: 1fr; gap: 20px; }
}

@media (max-width: 620px) {
  body { font-size: 16px; }
  .site-header { min-height: 64px; }
  .brand { gap: 7px; font-size: 17px; }
  .brand-mark { width: 28px; height: 28px; }
  .site-header nav a { display: none; }
  .site-header nav button { font-size: 15px; }
  .download-hero { padding: 38px 16px 48px; }
  .hero-content h1 { font-size: clamp(38px, 12vw, 52px); line-height: 1.14; }
  .hero-summary { margin-top: 18px; font-size: 18px; }
  .benefits { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 8px; margin-top: 24px; }
  .benefits li { font-size: 14px; }
  .download-action { flex-direction: column; gap: 10px; margin-top: 26px; }
  .main-download { width: 100%; min-width: 0; min-height: 74px; padding: 12px 16px; }
  .download-status { max-width: none; }
  .main-download strong { font-size: 20px; }
  .main-download small { font-size: 13px; }
  .release-facts { font-size: 13px; }
  .alternative-downloads { display: grid; gap: 0; font-size: 14px; }
  .alternative-downloads > span { display: none; }
  .alternative-downloads a { justify-content: center; }
  .install-strip { margin-top: 22px; }
  .beginner-entry { grid-template-columns: 1fr; gap: 12px; width: calc(100% - 32px); margin-top: 48px; padding: 24px 20px; }
  .beginner-entry__index { font-size: 19px; }
  .beginner-entry h2 { font-size: 22px; }
  .beginner-entry > a { grid-column: auto; width: 100%; }
  .share-card { width: calc(100% - 32px); padding: 24px 20px; }
  .share-card pre { padding: 15px; font-size: 14px; }
  .install-strip h2 { font-size: 18px; }
  .install-strip li { grid-template-columns: 28px 42px minmax(0, 1fr); gap: 10px; }
  .install-strip li > svg { width: 40px; height: 40px; }
  .install-strip strong { font-size: 16px; }
  .install-strip p { font-size: 13px; }
  .download-note { align-items: flex-start; font-size: 13px; text-align: left; }
  .download-note svg { flex: 0 0 auto; margin-top: 2px; }
  .product-proof { width: calc(100% - 32px); padding: 66px 0; }
  .proof-copy h2 { font-size: 32px; }
  .proof-copy > p { font-size: 16px; }
  .publisher-boundary { grid-template-columns: 1fr; gap: 12px; width: calc(100% - 32px); margin-bottom: 48px; }
  footer { flex-wrap: wrap; gap: 4px 18px; padding: 16px; }
  footer span { width: 100%; margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .main-download { transition: none; }
  .download-status__pulse::after { animation: none; opacity: 0; }
  .download-status.is-counting strong { animation: none; }
}