:root{
  --bg:#f7fbfe;--paper:#fff;--ink:#071a2b;--muted:#687f90;--line:#d8e5ed;--blue:#22b9e7;--navy:#092238;--soft:#eef6fa;
  --radius:28px;--max:1240px
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button{font:inherit}.hidden{display:none!important}

/* ===== Top bar ===== */
.topbar{height:74px;max-width:var(--max);margin:auto;padding:0 18px;display:flex;align-items:center;justify-content:space-between;position:relative;z-index:20}
.brand{display:flex;align-items:center;gap:12px}
.brand-mark{width:38px;height:38px;border-radius:50%;background:var(--navy);display:inline-block;position:relative;overflow:hidden}
.brand-mark:after{content:"";position:absolute;width:30px;height:30px;border-radius:50%;background:var(--bg);left:13px;top:-2px}
.brand-mark:before{content:"";position:absolute;width:6px;height:6px;border-radius:50%;background:var(--blue);right:2px;top:3px;z-index:2}
.brand-copy{display:flex;gap:9px;align-items:baseline}.brand-copy b{letter-spacing:.17em;font-size:15px}.brand-copy small{font-size:13px;color:var(--muted)}
.desktop-nav{display:flex;gap:34px;margin-left:auto;margin-right:38px}
.desktop-nav a{font-size:14px;color:#466174;transition:.2s;position:relative;padding:4px 2px}
.desktop-nav a:after{content:"";position:absolute;left:0;right:100%;bottom:-2px;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--blue),#7de1ff);transition:right .3s}
.desktop-nav a:hover:after,.desktop-nav a.active:after{right:0}
.desktop-nav a:hover,.desktop-nav a.active{color:var(--ink)}.desktop-nav a.active{font-weight:700}
.top-actions{display:flex;align-items:center;gap:10px}
.lang{border:0;background:transparent;padding:8px 10px;color:#4d687b;cursor:pointer;border-radius:10px;transition:color .2s,background .2s}
.lang:hover{color:var(--ink);background:rgba(34,185,231,.1)}
.top-download{background:var(--ink);color:#fff;padding:11px 18px;border-radius:999px;font-size:13px}
.menu-btn{display:none;background:none;border:0;width:42px;height:42px;position:relative}
.menu-btn span{position:absolute;left:10px;width:22px;height:1px;background:var(--ink)}.menu-btn span:first-child{top:16px}.menu-btn span:last-child{top:24px}
.mobile-menu{display:none}

/* ===== Shared ===== */
main{overflow:hidden}
.btn{min-height:50px;padding:0 22px;border-radius:999px;display:inline-flex;align-items:center;gap:16px;justify-content:center;font-weight:700;font-size:14px;transition:transform .2s,box-shadow .2s,background .2s}
.btn.primary{background:var(--ink);color:#fff}
.btn.ghost{border:1px solid #bdced9;background:rgba(255,255,255,.7)}
.btn:hover{transform:translateY(-2px)}.btn.primary:hover{box-shadow:0 14px 30px rgba(7,26,43,.18)}.btn:active{transform:translateY(0) scale(.985)}
.visual-shell{border:1px solid rgba(116,154,177,.22);background:#fff;border-radius:36px;box-shadow:0 26px 80px rgba(15,42,61,.12);overflow:hidden}
.visual-shell img{display:block;width:100%;height:auto}

/* ===== Hero: the visual carries the first screen ===== */
.hero{max-width:var(--max);min-height:min(860px,88vh);margin:0 auto;padding:40px 18px 92px;display:grid;grid-template-columns:.6fr 1.4fr;gap:52px;align-items:center}
.hero-copy{padding-left:6px}
.eyebrow{display:flex;align-items:center;gap:10px;color:#668296;font-size:12px;letter-spacing:.14em}
.eyebrow span{width:8px;height:8px;border-radius:50%;background:var(--blue);box-shadow:0 0 0 7px rgba(34,185,231,.1)}
.hero h1{margin:24px 0 20px;font-family:Georgia,"Noto Serif SC","Songti SC",serif;font-size:clamp(42px,4.6vw,72px);font-weight:500;line-height:1.04;letter-spacing:-.035em}
.hero-lead{margin:0;max-width:460px;font-size:17px;line-height:1.85;color:#536f82}
.hero-sub{margin:16px 0 0;font-size:15px;color:#7b93a3}
.hero-actions{display:flex;gap:12px;margin-top:32px}
.hero-beta{margin:22px 0 0;font-size:11px;letter-spacing:.16em;color:#8ba2b1}
.hero-media{position:relative}
.hero-shell{transform:rotate(.6deg)}

/* ===== Scenes ===== */
.scene{max-width:var(--max);margin:0 auto 40px;padding:56px 18px;display:grid;grid-template-columns:.44fr .56fr;gap:58px;align-items:center}
.scene.flip .scene-visual{order:-1}
.scene-copy h2{margin:0 0 26px;font-family:Georgia,"Noto Serif SC","Songti SC",serif;font-size:clamp(34px,4.2vw,58px);font-weight:500;line-height:1.1;letter-spacing:-.03em}
.scene-lines{margin:0;font-size:19px;line-height:2.05;color:#5b7688}
.scene-note{margin:30px 0 0;padding-top:24px;border-top:1px solid var(--line);font-size:17px;line-height:1.9;color:#2f5670}
.scene-action{margin-top:28px}
.scene-visual img{display:block;width:100%;height:auto;border-radius:28px;box-shadow:0 22px 62px rgba(15,42,61,.12)}
.scene.dark{background:#081d30;border-radius:36px;color:#fff;padding:70px 56px;box-shadow:0 30px 80px rgba(6,24,40,.22)}
.scene.dark .scene-lines{color:#a9c0cf}
.scene.dark .scene-note{border-top-color:rgba(255,255,255,.16);color:#e4f2fa}
.scene.dark .scene-visual img{box-shadow:0 28px 70px rgba(0,0,0,.32)}
.world-chips{list-style:none;display:flex;flex-wrap:wrap;gap:10px;margin:0;padding:0}
.world-chips li{padding:11px 18px;border:1px solid var(--line);border-radius:999px;background:#fff;font-size:15px;color:#3f6076}

/* ===== Community ===== */
.community{max-width:var(--max);margin:60px auto 110px;padding:66px 70px;border-radius:34px;background:#0a2136;color:#fff;display:grid;grid-template-columns:1fr .9fr;gap:70px;align-items:center}
.community-copy h2{font-family:Georgia,"Noto Serif SC",serif;font-size:clamp(38px,4.6vw,60px);font-weight:500;line-height:1.08;margin:0 0 20px}
.community-copy p{max-width:520px;color:#a7bdcc;line-height:1.85;margin:0}
.community-actions{display:flex;gap:18px;align-items:stretch;flex-wrap:wrap;margin-top:30px}
.community-actions .text-link{align-self:center}
.text-link{font-size:13px;color:#a9c6d8}
.contact-card{min-width:176px;border:1px solid rgba(255,255,255,.16);border-radius:16px;background:rgba(255,255,255,.08);color:#fff;padding:14px 16px;text-align:left;cursor:pointer;transition:background .2s,border-color .2s,transform .2s}
.contact-card:hover{background:rgba(255,255,255,.14);border-color:rgba(255,255,255,.28);transform:translateY(-2px)}
.contact-card small,.contact-card span{display:block;color:#8fb1c5;font-size:10px;letter-spacing:.08em}
.contact-card strong{display:block;margin:5px 0 6px;font-size:16px}
.contact-card:disabled{cursor:not-allowed;opacity:.5}
.community-feed{display:flex;flex-direction:column;gap:12px}
.community-feed div{padding:20px 22px;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.1);border-radius:18px}
.community-feed small{display:block;color:#769db5;font-size:10px;letter-spacing:.08em;margin-bottom:9px}
.community-feed b{font-size:14px;font-weight:600;line-height:1.5}

/* ===== Download ===== */
.download{max-width:var(--max);margin:0 auto 80px;padding:0 18px}
.download-card{background:#fff;border:1px solid #dce8ef;border-radius:34px;min-height:470px;display:grid;grid-template-columns:1fr .8fr;overflow:hidden}
.download-copy{padding:72px}
.download-copy h2{font-family:Georgia,"Noto Serif SC",serif;font-size:clamp(42px,5.4vw,68px);font-weight:500;margin:0 0 15px}
.download-copy p{color:#6a8293;line-height:1.7;margin:0}
.apk-button{margin-top:0;background:var(--ink);color:#fff;border-radius:20px;padding:18px 20px;display:flex;align-items:center;justify-content:space-between;max-width:420px;transition:transform .2s,box-shadow .2s}
.download-channels{display:flex;flex-direction:column;gap:12px;margin-top:28px;max-width:420px}
.apk-button.ghost{background:transparent;color:var(--ink);border:1px solid #bdced9}
.apk-button.ghost small{color:#7f98a8}
.apk-button.ghost:hover{box-shadow:0 16px 36px rgba(7,26,43,.08);background:#fff}
.apk-button small{display:block;color:#85a9bf;font-size:9px;letter-spacing:.12em}
.apk-button strong{display:block;font-size:18px;margin-top:4px}
.apk-button>b{font-size:26px;transition:transform .2s}
.apk-button:hover{transform:translateY(-2px);box-shadow:0 16px 36px rgba(7,26,43,.18)}.apk-button:hover>b{transform:translateY(2px)}
.release-meta{display:flex;gap:34px;margin-top:24px}
.release-meta span{display:flex;flex-direction:column;gap:4px}
.release-meta small{font-size:10px;color:#91a5b2}.release-meta b{font-size:12px;overflow-wrap:anywhere}
.download-art{position:relative;background:linear-gradient(145deg,#f4fafe,#e6f2f9)}
.download-logo{position:absolute;width:200px;height:200px;border-radius:50%;background:#0b2a45;left:50%;top:50%;transform:translate(-50%,-50%);box-shadow:0 25px 70px rgba(14,56,84,.2)}
.download-logo:after{content:"";position:absolute;width:170px;height:170px;border-radius:50%;background:#eaf5fb;left:74px;top:-12px}
.download-ring{position:absolute;border:1px solid #9cdcf3;border-radius:50%;left:50%;top:50%;transform:translate(-50%,-50%)}
.r1{width:330px;height:330px}.r2{width:460px;height:460px;opacity:.4}
.download-dot{position:absolute;width:12px;height:12px;border-radius:50%;background:var(--blue);box-shadow:0 0 22px #38c6ef}.d1{left:27%;top:33%}.d2{right:24%;bottom:28%}

/* ===== Footer & utilities ===== */
footer{max-width:var(--max);margin:auto;padding:30px 18px 44px;border-top:1px solid var(--line);display:grid;grid-template-columns:1fr auto auto;align-items:center;gap:28px;color:#6b8292}
.footer-brand{display:flex;align-items:center;gap:12px}
.footer-brand .brand-mark{width:31px;height:31px}
.footer-brand div{display:flex;flex-direction:column;gap:3px}
.footer-brand b{font-size:12px;color:var(--ink)}.footer-brand small{font-size:10px}
.footer-links{display:flex;gap:22px;font-size:11px}.footer-copy{font-size:10px}
.toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,20px);opacity:0;background:#071a2b;color:#fff;padding:10px 15px;border-radius:999px;font-size:12px;z-index:50;transition:.2s}
.toast.show{opacity:1;transform:translate(-50%,0)}
.reveal{opacity:0;transform:translateY(22px);transition:opacity .65s ease,transform .65s ease}
.reveal.visible{opacity:1;transform:none}
.to-top{position:fixed;z-index:60;right:22px;bottom:24px;width:46px;height:46px;border-radius:50%;border:1px solid rgba(34,185,231,.3);background:rgba(255,255,255,.95);color:var(--blue);font-size:19px;cursor:pointer;box-shadow:0 12px 28px rgba(7,26,43,.14);opacity:0;transform:translateY(14px);pointer-events:none;transition:opacity .3s,transform .3s}
.to-top.show{opacity:1;transform:none;pointer-events:auto}.to-top:hover{transform:translateY(-2px)}
.btn:focus-visible,.apk-button:focus-visible,.lang:focus-visible,.menu-btn:focus-visible,.to-top:focus-visible,.contact-card:focus-visible{outline:3px solid rgba(34,185,231,.4);outline-offset:2px}

@media(max-width:900px){
  .desktop-nav,.top-download{display:none}
  .menu-btn{display:block}
  .mobile-menu{position:fixed;top:68px;left:12px;right:12px;background:rgba(255,255,255,.97);border:1px solid var(--line);border-radius:18px;padding:8px;z-index:40;box-shadow:0 20px 60px rgba(8,28,43,.14);transform:translateY(-8px);opacity:0;pointer-events:none;transition:.2s}
  .mobile-menu.open{display:grid;opacity:1;transform:none;pointer-events:auto}
  .mobile-menu a{padding:14px 16px;border-bottom:1px solid #eef3f6}.mobile-menu a:last-child{border:0}
  .mobile-menu a.active{background:var(--soft);color:var(--ink);font-weight:700}
  .hero{grid-template-columns:1fr;padding:28px 18px 64px;gap:40px;min-height:auto}
  .hero-copy{max-width:680px}
  .scene{grid-template-columns:1fr;gap:38px;padding:44px 18px;margin-bottom:16px}
  .scene .scene-copy{order:-1}
  .scene.dark{padding:48px 28px;margin-left:14px;margin-right:14px}
  .community{margin:30px 14px 70px;padding:46px 30px;grid-template-columns:1fr;gap:40px}
  .download-card{grid-template-columns:1fr}
  .download-copy{padding:48px 34px}
  .download-art{min-height:330px}
  footer{grid-template-columns:1fr}.footer-links{flex-wrap:wrap}
}
@media(max-width:560px){
  .to-top{right:14px;bottom:16px;width:42px;height:42px}
  .topbar{height:66px}.brand-copy b{font-size:13px}.brand-copy small{font-size:11px}
  .hero{padding:20px 16px 52px}
  .hero h1{font-size:40px}
  .hero-lead{font-size:16px}
  .hero-actions{flex-direction:column;align-items:stretch}
  .btn{width:100%}
  .hero-shell{border-radius:22px}
  .scene{padding:36px 16px}
  .scene-copy h2{font-size:32px}
  .scene-lines{font-size:17px;line-height:1.95}
  .scene-note{font-size:16px}
  .scene-visual img{border-radius:20px}
  .scene.dark{border-radius:24px;padding:38px 22px}
  .community{border-radius:24px}
  .download{padding:0 14px}.download-card{border-radius:24px}.download-copy{padding:38px 24px}
  .release-meta{gap:18px;flex-wrap:wrap}
  .download-art{min-height:260px}
  .download-logo{width:130px;height:130px}.download-logo:after{width:112px;height:112px;left:48px}
  .r1{width:220px;height:220px}.r2{width:300px;height:300px}
  footer{padding:28px 16px 40px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.reveal{opacity:1;transform:none;transition:none}}