:root {
  color-scheme: dark;
  --ink: #f5f7fb;
  --muted: #9da8b8;
  --dim: #717c8d;
  --line: rgba(255, 255, 255, 0.11);
  --blue: #23b7ff;
  --violet: #9b54ff;
  --coral: #ff7050;
  --focus: #7dd9ff;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background: radial-gradient(circle at 72% 8%, rgba(67, 61, 155, 0.18), transparent 30rem), #080b12;
  font-family: Manrope, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  font-synthesis: none;
}

a { color: inherit; }

.skip-link {
  position: fixed;
  z-index: 20;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  color: #071018;
  background: var(--focus);
  border-radius: 8px;
  transform: translateY(-160%);
}

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

.site-header, main, footer {
  width: min(1180px, calc(100% - 48px));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 92px;
  border-bottom: 1px solid var(--line);
}

.brand, .footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 16px;
  font-weight: 720;
  letter-spacing: -0.02em;
}

.brand { text-decoration: none; }

.brand img, .footer-brand img {
  border-radius: 50%;
  box-shadow: 0 0 28px rgba(43, 157, 255, 0.16);
}

.header-link {
  font-size: 14px;
  color: #c5ccd6;
  text-underline-offset: 5px;
  text-decoration-color: rgba(197, 204, 214, 0.35);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(340px, 0.94fr);
  align-items: center;
  gap: clamp(32px, 7vw, 100px);
  min-height: 660px;
  padding: 72px 0 84px;
}

.eyebrow, .section-kicker, .platform-label {
  margin: 0;
  color: #aab4c2;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

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

.eyebrow span {
  width: 24px;
  height: 1px;
  background: linear-gradient(90deg, var(--blue), var(--violet));
}

h1 {
  max-width: 720px;
  margin: 27px 0 25px;
  font-size: clamp(48px, 6.4vw, 82px);
  font-weight: 780;
  line-height: 1.04;
  letter-spacing: -0.065em;
}

.hero-description {
  max-width: 570px;
  margin: 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.8;
}

.hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 34px;
}

.hero-facts span {
  padding: 7px 11px;
  color: #bac3cf;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 12px;
}

.flight-mark {
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  isolation: isolate;
}

.flight-mark::before {
  content: "";
  position: absolute;
  inset: 8%;
  z-index: -3;
  background: repeating-radial-gradient(circle, transparent 0 38px, rgba(255, 255, 255, 0.042) 39px 40px);
  mask-image: radial-gradient(circle, black 25%, transparent 72%);
}

.flight-mark > img {
  width: clamp(128px, 17vw, 184px);
  height: auto;
  border-radius: 50%;
  box-shadow: 0 18px 70px rgba(0, 0, 0, 0.5);
  animation: settle 900ms cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.kite-glow {
  position: absolute;
  z-index: -2;
  width: 54%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: conic-gradient(from 120deg, rgba(35, 183, 255, 0.3), rgba(155, 84, 255, 0.3), rgba(255, 112, 80, 0.25), rgba(35, 183, 255, 0.3));
  filter: blur(42px);
  opacity: 0.75;
}

.flight-orbit {
  position: absolute;
  z-index: -1;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  transform: rotate(-22deg);
}

.flight-orbit::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -4px;
  width: 7px;
  height: 7px;
  background: var(--blue);
  border-radius: 50%;
  box-shadow: 0 0 16px var(--blue);
}

.flight-orbit-one { width: 80%; height: 56%; }
.flight-orbit-two { width: 56%; height: 88%; transform: rotate(46deg); }

.flight-orbit-two::after {
  top: auto;
  right: auto;
  bottom: 10%;
  left: 7%;
  background: var(--coral);
  box-shadow: 0 0 16px var(--coral);
}

.flight-label {
  position: absolute;
  padding: 7px 10px;
  color: #c8d0db;
  background: rgba(8, 11, 18, 0.78);
  border: 1px solid var(--line);
  border-radius: 6px;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  backdrop-filter: blur(10px);
}

.flight-label-desktop { top: 18%; right: 2%; }
.flight-label-mobile { bottom: 19%; left: 1%; }

.download-section {
  padding: 88px 0 104px;
  border-top: 1px solid var(--line);
}

.section-heading, .product-note {
  display: grid;
  grid-template-columns: minmax(140px, 0.32fr) minmax(0, 1fr);
  gap: 40px;
}

.section-heading h2, .product-note h2 {
  margin: 0;
  font-size: clamp(32px, 4.5vw, 54px);
  line-height: 1.1;
  letter-spacing: -0.045em;
}

.section-heading > div > p, .product-note > div > p {
  max-width: 650px;
  margin: 18px 0 0;
  color: var(--muted);
  line-height: 1.75;
}

.release-rail {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 48px minmax(0, 1fr);
  align-items: center;
  margin-top: 64px;
}

.release-rail::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 25%;
  right: 25%;
  z-index: -1;
  height: 1px;
  background: linear-gradient(90deg, var(--blue), var(--violet) 50%, var(--coral));
}

.rail-node { display: grid; place-items: center; }

.rail-node span {
  width: 10px;
  height: 10px;
  background: var(--violet);
  border: 3px solid #080b12;
  border-radius: 50%;
  box-shadow: 0 0 0 1px var(--violet), 0 0 24px rgba(155, 84, 255, 0.65);
}

.release-card {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 22px;
  min-height: 356px;
  padding: clamp(28px, 4vw, 44px);
  overflow: hidden;
  background: linear-gradient(145deg, rgba(23, 30, 43, 0.96), rgba(13, 18, 27, 0.98));
  border: 1px solid var(--line);
  border-radius: 18px;
}

.release-card::after {
  content: "";
  position: absolute;
  top: -110px;
  right: -90px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  opacity: 0.16;
}

.release-card-windows::after { background: var(--blue); }
.release-card-android::after { background: var(--coral); }

.release-number {
  position: absolute;
  top: 20px;
  right: 24px;
  color: rgba(255, 255, 255, 0.08);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 72px;
  font-weight: 700;
  letter-spacing: -0.08em;
}

.platform-icon {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--line);
  border-radius: 13px;
}

.platform-icon svg { width: 25px; height: 25px; fill: currentColor; }

.release-card-android .platform-icon svg {
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.release-copy { position: relative; z-index: 1; }

.release-copy h3 {
  margin: 8px 0 5px;
  font-size: 30px;
  letter-spacing: -0.04em;
}

.release-copy > p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}

.release-version {
  grid-column: 1 / -1;
  align-self: end;
  min-height: 20px;
  margin: 20px 0 0;
  color: #aab4c2;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
}

.download-button {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 54px;
  padding: 0 18px;
  color: #071018;
  background: var(--ink);
  border-radius: 10px;
  font-size: 14px;
  font-weight: 760;
  text-decoration: none;
  transition: transform 180ms ease, background-color 180ms ease;
}

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

.download-button:not([aria-disabled="true"]):hover {
  background: #dff6ff;
  transform: translateY(-2px);
}

.download-button[aria-disabled="true"] {
  color: #707988;
  background: #242a34;
  cursor: wait;
}

.release-note {
  grid-column: 1 / -1;
  margin: -10px 0 0;
  color: var(--dim);
  font-size: 12px;
  text-align: center;
}

.product-note {
  padding: 86px 0 96px;
  border-top: 1px solid var(--line);
}

.product-note h2 { max-width: 760px; }

footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  min-height: 108px;
  color: var(--dim);
  border-top: 1px solid var(--line);
  font-size: 12px;
}

.footer-brand { color: #a9b2bf; font-size: 13px; }
.footer-brand small { color: var(--dim); font: inherit; }

.registrations {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.registrations a {
  display: inline-flex;
  align-items: center;
  color: var(--dim);
  text-decoration: none;
}

.registrations a:hover {
  color: #b8c1cd;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.beian-icon { margin-right: 4px; }
a:focus-visible { outline: 2px solid var(--focus); outline-offset: 4px; }

@keyframes settle {
  from { opacity: 0; transform: scale(0.88) rotate(-5deg); }
  to { opacity: 1; transform: scale(1) rotate(0); }
}

@media (max-width: 820px) {
  .hero { grid-template-columns: 1fr; min-height: auto; padding-top: 72px; }
  .flight-mark { width: min(460px, 100%); margin: -16px auto 0; }
  .section-heading, .product-note { grid-template-columns: 1fr; gap: 20px; }
  .release-rail { grid-template-columns: 1fr; gap: 22px; }
  .release-rail::before, .rail-node { display: none; }
}

@media (max-width: 560px) {
  .site-header, main, footer { width: min(100% - 32px, 1180px); }
  .site-header { min-height: 76px; }
  .brand img { width: 36px; height: 36px; }
  .header-link { font-size: 12px; }
  .hero { gap: 12px; padding: 56px 0 64px; }
  h1 { margin-top: 22px; font-size: clamp(42px, 13vw, 62px); }
  .hero-description { font-size: 16px; }
  .flight-mark { margin-top: 8px; }
  .download-section { padding: 64px 0 72px; }
  .section-heading h2, .product-note h2 { font-size: 36px; }
  .release-rail { margin-top: 42px; }
  .release-card { min-height: 342px; padding: 26px 22px; }
  .release-number { font-size: 58px; }
  .product-note { padding: 64px 0 72px; }
  footer { align-items: flex-start; flex-direction: column; justify-content: center; padding: 28px 0; }
  .registrations { justify-content: flex-start; }
}

@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;
  }
}