:root {
  color-scheme: dark;
  --background: #0b100e;
  --surface: #131a17;
  --surface-raised: #18221d;
  --line: rgba(202, 238, 220, 0.12);
  --accent: #a8f1ca;
  --accent-strong: #68dfa5;
  --text: #f2f6f3;
  --muted: #a0aaa4;
  --soft: #66726b;
}

* { box-sizing: border-box; }
html { min-width: 320px; scroll-behavior: smooth; background: var(--background); }
body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(ellipse at 50% -28%, rgba(72, 137, 100, 0.17), transparent 50rem),
    var(--background);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}
button, a { font: inherit; }
a { color: inherit; }
.page { width: min(1280px, calc(100% - 72px)); margin: 0 auto; }
.topbar { display: flex; min-height: 88px; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--text); font-size: 16px; font-weight: 600; letter-spacing: -0.03em; text-decoration: none; }
.brand strong { color: var(--accent); font-weight: 700; }
.brand-mark { display: grid; width: 36px; height: 36px; place-items: center; border: 1px solid rgba(168, 241, 202, 0.38); border-radius: 12px; color: #102018; background: var(--accent); font-size: 20px; font-weight: 800; }
.channel-switch { display: inline-flex; gap: 4px; padding: 4px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255, 255, 255, 0.025); }
.channel { min-width: 82px; padding: 9px 16px; border: 0; border-radius: 999px; color: var(--muted); background: transparent; cursor: pointer; font-size: 12px; font-weight: 700; letter-spacing: 0.08em; transition: color 160ms ease, background 160ms ease; }
.channel:hover { color: var(--text); }
.channel.active { color: #112017; background: var(--accent); }
.hero { position: relative; display: grid; min-height: 484px; grid-template-columns: 1fr 0.82fr; align-items: center; gap: clamp(44px, 8vw, 120px); padding: 58px 3.5% 82px; overflow: hidden; }
.hero-copy { position: relative; z-index: 1; padding-top: 8px; }
.eyebrow { display: flex; align-items: center; gap: 9px; margin: 0 0 22px; color: var(--accent); font-size: 11px; font-weight: 700; letter-spacing: 0.17em; }
.live-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent-strong); box-shadow: 0 0 15px rgba(104, 223, 165, 0.8); }
h1 { margin: 0; font-size: clamp(48px, 6vw, 76px); font-weight: 650; letter-spacing: -0.075em; line-height: 1.13; }
h1 span { color: var(--accent); }
.hero-intro { max-width: 435px; margin: 24px 0 0; color: #a9b3ad; font-size: 15px; line-height: 1.9; }
.hero-link { display: inline-flex; align-items: center; gap: 12px; margin-top: 30px; color: var(--text); font-size: 13px; font-weight: 600; text-decoration: none; }
.hero-link span { display: grid; width: 28px; height: 28px; place-items: center; border: 1px solid rgba(255,255,255,.24); border-radius: 50%; color: var(--accent); }
.hero-art { position: relative; height: 342px; overflow: hidden; border: 1px solid rgba(255,255,255,.14); border-radius: 5px 100px 5px 5px; background: radial-gradient(ellipse at 50% 46%, rgba(86, 161, 119, .18), transparent 58%), linear-gradient(140deg, #1b2d23, #101713 72%); box-shadow: 0 28px 90px rgba(0,0,0,.36); }
.hero-art::before { position: absolute; right: -115px; bottom: -174px; width: 370px; height: 370px; border: 1px solid rgba(168,241,202,.13); border-radius: 50%; content: ""; }
.hero-art::after { position: absolute; top: 36px; left: 35px; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 24px 5px rgba(168,241,202,.26); content: ""; }
.platform-visual { position: absolute; inset: 0; display: grid; place-items: center; }
.visual-window { position: relative; z-index: 1; width: min(76%, 430px); padding: 19px 21px 15px; transform: rotate(-3deg); border: 1px solid rgba(211,241,222,.19); border-radius: 13px; background: linear-gradient(145deg, rgba(26,39,32,.97), rgba(15,23,18,.98)); box-shadow: 0 22px 55px rgba(0,0,0,.42); }
.window-bar, .window-dots, .visual-heading, .visual-foot { display: flex; align-items: center; }
.window-bar { justify-content: space-between; color: #7f9185; font-size: 8px; font-weight: 700; letter-spacing: .12em; }
.window-dots { gap: 4px; }
.window-dots i { width: 5px; height: 5px; border-radius: 50%; background: #6b8373; }
.window-mark { color: var(--accent); font-size: 13px; }
.visual-heading { justify-content: space-between; margin: 25px 0 11px; color: #dfece3; font-size: 9px; font-weight: 700; letter-spacing: .13em; }
.visual-heading span:last-child { color: #718277; font-variant-numeric: tabular-nums; }
.visual-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; }
.visual-tile { display: flex; min-height: 75px; align-items: center; justify-content: center; flex-direction: column; gap: 9px; border: 1px solid rgba(168,241,202,.12); border-radius: 7px; color: #b7c7bc; background: rgba(168,241,202,.035); font-size: 9px; }
.tile-icon { position: relative; display: block; width: 17px; height: 17px; border: 1.5px solid var(--accent); opacity: .9; }
.phone-icon { width: 12px; height: 19px; border-radius: 3px; }
.phone-icon::after { position: absolute; bottom: 2px; left: 4px; width: 2px; height: 2px; border-radius: 50%; background: var(--accent); content: ""; }
.android-icon { width: 17px; height: 16px; border-radius: 5px 5px 3px 3px; }
.android-icon::before { position: absolute; top: 4px; left: 4px; width: 2px; height: 2px; border-radius: 50%; background: var(--accent); box-shadow: 6px 0 var(--accent); content: ""; }
.windows-icon { background: linear-gradient(90deg, transparent 46%, var(--accent) 47%, var(--accent) 53%, transparent 54%), linear-gradient(0deg, transparent 46%, var(--accent) 47%, var(--accent) 53%, transparent 54%); }
.web-icon { border-radius: 50%; }
.visual-progress { height: 2px; margin-top: 15px; overflow: hidden; background: rgba(255,255,255,.08); }
.visual-progress span { display: block; width: 68%; height: 100%; background: var(--accent-strong); }
.visual-foot { justify-content: space-between; margin-top: 12px; color: #829187; font-size: 8px; letter-spacing: .04em; }
.download-symbol { display: grid; width: 20px; height: 20px; place-items: center; border: 1px solid rgba(168,241,202,.3); border-radius: 50%; color: var(--accent); font-size: 12px; }
.visual-orbit { position: absolute; width: 280px; height: 280px; border: 1px solid rgba(168,241,202,.07); border-radius: 50%; }
.orbit-one { transform: scaleX(1.24) rotate(-23deg); }
.orbit-two { width: 205px; height: 205px; border-style: dashed; opacity: .7; }
.art-caption { position: absolute; z-index: 2; right: 22px; bottom: 20px; left: 22px; display: flex; justify-content: space-between; color: #f3f8f4; font-size: 10px; font-weight: 700; letter-spacing: .14em; }
.hero-index { position: absolute; right: 3.5%; bottom: 26px; color: var(--accent); font-size: 12px; font-weight: 700; letter-spacing: .12em; }
.hero-index span { margin-left: 8px; color: var(--soft); font-size: 10px; }
.downloads { padding: 35px 0 50px; border-top: 1px solid var(--line); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin: 0 0 25px; }
.section-heading .eyebrow { margin-bottom: 10px; }
h2 { margin: 0; font-size: clamp(27px, 3vw, 36px); font-weight: 650; letter-spacing: -0.06em; }
.channel-caption { margin: 0 0 5px; color: var(--muted); font-size: 12px; }
.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.card { display: flex; min-width: 0; min-height: 340px; flex-direction: column; padding: 22px 23px 20px; border: 1px solid var(--line); border-radius: 5px; background: linear-gradient(145deg, rgba(24,34,29,.9), rgba(17,24,20,.78)); transition: border-color 180ms ease, transform 180ms ease, background 180ms ease; }
.card:hover { transform: translateY(-3px); border-color: rgba(168,241,202,.33); background: linear-gradient(145deg, rgba(30,43,36,.96), rgba(17,24,20,.9)); }
.card-head { display: flex; align-items: center; justify-content: space-between; }
.platform-icon { display: grid; width: 38px; height: 38px; place-items: center; border: 1px solid rgba(168,241,202,.2); border-radius: 12px; color: var(--accent); background: rgba(168,241,202,.08); font-size: 19px; }
.tag { padding: 6px 9px; border: 1px solid rgba(168,241,202,.19); border-radius: 999px; color: var(--accent); font-size: 9px; font-weight: 800; letter-spacing: .11em; }
.platform-detail { margin: 21px 0 5px; color: var(--soft); font-size: 11px; letter-spacing: .04em; }
.card-title { margin: 0; font-size: 19px; font-weight: 620; letter-spacing: -.04em; }
.meta { display: grid; grid-template-columns: 1fr 1.25fr .75fr; gap: 8px; margin: 19px 0 0; padding: 14px 0 13px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.meta-item { min-width: 0; }
.meta-item dt { margin-bottom: 5px; color: var(--soft); font-size: 10px; }
.meta-item dd { overflow-wrap: anywhere; margin: 0; color: #d8e0da; font-size: 11px; font-variant-numeric: tabular-nums; }
.release-note { min-height: 39px; margin: 12px 0 16px; color: var(--muted); font-size: 11px; line-height: 1.7; }
.action { display: flex; min-height: 43px; align-items: center; justify-content: space-between; gap: 10px; margin-top: auto; padding: 0 14px; border: 1px solid var(--accent); border-radius: 4px; color: #0b1710; background: var(--accent); font-size: 12px; font-weight: 750; text-decoration: none; transition: background 160ms ease, border-color 160ms ease; }
.action:hover { border-color: #c6f8dc; background: #c6f8dc; }
.action-arrow { font-size: 16px; line-height: 1; }
.action.disabled { border-color: var(--line); color: var(--soft); background: #1b2520; }
.status { min-height: 18px; margin: 18px 2px 0; color: var(--soft); font-size: 11px; }
.state-message { grid-column: 1 / -1; margin: 0; padding: 50px 24px; border: 1px dashed var(--line); color: var(--muted); text-align: center; font-size: 13px; }
.retry-button { margin-left: 9px; padding: 0; border: 0; color: var(--accent); background: transparent; cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.footer { display: flex; justify-content: space-between; gap: 20px; padding: 20px 0 27px; border-top: 1px solid var(--line); color: var(--soft); font-size: 10px; letter-spacing: .04em; }
.wechat-hint[hidden] { display: none; }
.wechat-hint { position: fixed; z-index: 20; inset: 0; display: flex; align-items: center; justify-content: center; flex-direction: column; padding: 24px; background: rgba(3, 7, 5, .94); text-align: center; }
.wechat-hint img { display: block; width: min(565px, 100%); height: auto; }
.wechat-hint p { max-width: 400px; margin: 16px 0 0; color: var(--text); font-size: 14px; line-height: 1.7; }
.hint-close { position: absolute; top: max(18px, env(safe-area-inset-top)); right: max(18px, env(safe-area-inset-right)); display: grid; width: 40px; height: 40px; place-items: center; border: 1px solid var(--line); border-radius: 50%; color: var(--text); background: #18221d; cursor: pointer; font-size: 23px; }

@media (max-width: 960px) {
  .page { width: min(100% - 48px, 760px); }
  .hero { min-height: 425px; grid-template-columns: 1fr .72fr; gap: 30px; padding-right: 1%; padding-left: 1%; }
  .hero-art { height: 300px; }
  .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .card { min-height: 330px; }
}
@media (max-width: 620px) {
  .page { width: calc(100% - 36px); }
  .topbar { min-height: 72px; }
  .brand { gap: 9px; font-size: 14px; }
  .brand-mark { width: 32px; height: 32px; border-radius: 10px; }
  .channel { min-width: 69px; padding: 8px 12px; font-size: 10px; }
  .hero { min-height: 0; grid-template-columns: 1fr; gap: 28px; padding: 54px 0 65px; }
  .hero-copy { padding: 0 1px; }
  .eyebrow { margin-bottom: 16px; font-size: 10px; }
  h1 { font-size: clamp(43px, 12vw, 58px); }
  .hero-intro { max-width: 380px; margin-top: 17px; font-size: 13px; }
  .hero-link { margin-top: 21px; }
  .hero-art { width: 100%; height: clamp(220px, 63vw, 300px); border-top-right-radius: 74px; }
  .visual-window { width: min(82%, 360px); padding: 15px 15px 12px; }
  .visual-heading { margin-top: 19px; }
  .visual-tile { min-height: 64px; }
  .hero-index { right: 0; bottom: 21px; }
  .downloads { padding: 28px 0 34px; }
  .section-heading { align-items: flex-start; flex-direction: column; gap: 9px; margin-bottom: 18px; }
  .channel-caption { font-size: 11px; }
  .cards { grid-template-columns: minmax(0, 1fr); gap: 11px; }
  .card { min-height: 0; padding: 20px; }
  .platform-detail { margin-top: 16px; }
  .meta { grid-template-columns: 1fr 1.35fr .75fr; }
  .release-note { min-height: 0; margin-bottom: 15px; }
  .footer { align-items: center; }
}
@media (max-width: 360px) {
  .page { width: calc(100% - 28px); }
  .brand { font-size: 13px; }
  .channel { min-width: 62px; padding-right: 9px; padding-left: 9px; }
  .meta { grid-template-columns: .85fr 1.25fr .75fr; }
  .meta-item dd { font-size: 10px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}