:root{
  --bg:#07091f;
  --bg2:#0d1236;
  --line:rgba(255,255,255,.08);
  --txt:#e8ebff;
  --sub:#9aa4d0;
  --gold:#ffb547;
  --gold2:#ff6b35;
  --cyan:#38e1ff;
  --purple:#7c5cff;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","WenQuanYi Micro Hei",system-ui,sans-serif;
  background:var(--bg);
  color:var(--txt);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
.container{max-width:1160px;margin:0 auto;padding:0 20px}
.section{padding:88px 0;position:relative}
.sec-head{text-align:center;margin-bottom:56px}
.sec-head h2{font-size:34px;letter-spacing:1px;background:linear-gradient(90deg,#fff,#ffd28a);-webkit-background-clip:text;background-clip:text;color:transparent}
.sec-head p{color:var(--sub);margin-top:12px;font-size:16px}

/* 导航 */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  backdrop-filter:blur(14px);
  background:rgba(7,9,31,.72);
  border-bottom:1px solid var(--line);
  transition:.3s;
}
.nav-inner{display:flex;align-items:center;height:68px;gap:32px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;letter-spacing:.5px}
.logo-mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--gold),var(--gold2));position:relative}
.logo-mark::after{content:"";position:absolute;inset:6px;border:2px solid #2a1508;border-radius:5px}
.logo-sub{color:var(--gold);font-size:14px;margin-left:2px}
.nav-links{display:flex;gap:26px;margin-left:auto}
.nav-links a{font-size:15px;color:var(--sub);transition:.2s;position:relative}
.nav-links a:hover{color:#fff}
.nav-links a::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;background:var(--gold);transition:.3s}
.nav-links a:hover::after{width:100%}
.nav-btn{padding:9px 22px;border-radius:30px;background:linear-gradient(90deg,var(--gold),var(--gold2));color:#1a0c04;font-weight:700;font-size:14px}
.nav-btn:hover{transform:translateY(-2px);box-shadow:0 8px 22px rgba(255,107,53,.4)}

/* Hero */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;justify-content:center;padding:120px 0 80px;overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:-2;
  background:
    radial-gradient(600px 400px at 78% 22%,rgba(124,92,255,.35),transparent 60%),
    radial-gradient(500px 420px at 15% 70%,rgba(56,225,255,.18),transparent 60%),
    linear-gradient(160deg,#050712 0%,#0b1030 55%,#140a2e 100%);
}
.hero-bg::before{content:"";position:absolute;inset:0;z-index:-1;opacity:.5;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:52px 52px;mask-image:radial-gradient(circle at 50% 40%,#000 30%,transparent 75%)}
.hero-inner{display:grid;grid-template-columns:1fr 1.05fr;gap:40px;align-items:center}
.hero-phone{position:relative;display:flex;justify-content:center}
.hero-phone img{width:300px;height:auto;border-radius:38px;box-shadow:0 30px 70px rgba(0,0,0,.6),0 0 0 1px rgba(255,255,255,.12)}
.hero-phone::before{content:"";position:absolute;width:340px;height:680px;border-radius:60px;background:linear-gradient(135deg,var(--gold),var(--purple));filter:blur(60px);opacity:.35;z-index:-1;top:50%;left:50%;transform:translate(-50%,-50%)}
.badge{display:inline-block;padding:6px 16px;border-radius:30px;font-size:13px;font-weight:700;color:#2a1508;background:linear-gradient(90deg,var(--gold),var(--gold2));margin-bottom:18px}
.hero h1{font-size:48px;line-height:1.25;font-weight:800;letter-spacing:1px}
.hero-desc{color:var(--sub);font-size:17px;margin:20px 0 26px;max-width:520px}
.hero-desc b{color:var(--gold)}
.hero-stats{display:flex;gap:36px;margin-bottom:34px}
.hero-stats div{display:flex;flex-direction:column;gap:4px}
.hero-stats span{font-size:13px;color:var(--sub)}
.hero-stats b{font-size:24px;color:#fff;font-weight:800}

/* 悬浮按钮 —— 核心要求：居中、显眼、无其它文字 */
.hero-actions{display:flex;gap:20px;justify-content:center;align-items:center;flex-wrap:wrap;position:relative;z-index:5}
.float-btn{
  display:flex;align-items:center;gap:12px;
  padding:20px 44px;border-radius:60px;font-size:20px;font-weight:800;letter-spacing:2px;
  color:#fff;position:relative;overflow:hidden;
  box-shadow:0 18px 40px rgba(0,0,0,.45);
  transition:transform .25s,box-shadow .25s;
  animation:floaty 3.2s ease-in-out infinite;
}
.float-btn.android{background:linear-gradient(120deg,#1ed760,#0fb850);text-shadow:0 2px 8px rgba(0,0,0,.25)}
.float-btn.ios{background:linear-gradient(120deg,#ffb547,#ff6b35);text-shadow:0 2px 8px rgba(0,0,0,.25);animation-delay:.6s}
.float-btn::after{content:"";position:absolute;top:0;left:-60%;width:50%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.35),transparent);transform:skewX(-22deg);transition:none}
.float-btn:hover{transform:translateY(-5px) scale(1.04)}
.float-btn:hover::after{animation:shine 1.1s}
.float-btn.android:hover{box-shadow:0 24px 50px rgba(15,184,80,.5)}
.float-btn.ios:hover{box-shadow:0 24px 50px rgba(255,107,53,.5)}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-7px)}}
@keyframes shine{100%{left:120%}}
.scroll-hint{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);width:26px;height:42px;border:2px solid rgba(255,255,255,.35);border-radius:20px}
.scroll-hint::before{content:"";position:absolute;top:8px;left:50%;transform:translateX(-50%);width:4px;height:8px;border-radius:4px;background:var(--gold);animation:scroll 1.6s infinite}
@keyframes scroll{0%{opacity:1;top:8px}100%{opacity:0;top:22px}}

/* 特色卡片 */
.features{background:linear-gradient(180deg,transparent,rgba(124,92,255,.05))}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.card{background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.02));border:1px solid var(--line);border-radius:20px;padding:32px 24px;transition:.3s}
.card:hover{transform:translateY(-8px);border-color:var(--c);box-shadow:0 20px 40px rgba(0,0,0,.35)}
.card-ic{width:60px;height:60px;border-radius:16px;display:grid;place-items:center;font-size:30px;background:color-mix(in srgb,var(--c) 18%,transparent);margin-bottom:18px}
.card h3{font-size:19px;margin-bottom:10px}
.card p{color:var(--sub);font-size:14.5px}

/* 界面预览 */
.screens{background:var(--bg2)}
.screen-row{display:flex;gap:26px;justify-content:center;flex-wrap:wrap}
.screen-row figure{text-align:center}
.screen-row img{width:230px;height:auto;border-radius:26px;box-shadow:0 22px 50px rgba(0,0,0,.5);transition:.35s;border:1px solid var(--line)}
.screen-row img:hover{transform:translateY(-12px) scale(1.03);box-shadow:0 30px 60px rgba(56,225,255,.18)}
.screen-row figcaption{margin-top:16px;color:var(--sub);font-size:15px}

/* 数据 */
.stats{background:linear-gradient(90deg,#0b1030,#1a1030,#0b1030);padding:60px 0}
.stat{text-align:center}
.stat b{display:block;font-size:46px;font-weight:800;background:linear-gradient(90deg,#fff,#ffd28a);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat span{color:var(--sub);font-size:15px}

/* 下载指南 */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:48px}
.step{text-align:center;padding:30px 20px;border-radius:18px;background:rgba(255,255,255,.03);border:1px solid var(--line)}
.step i{display:grid;place-items:center;width:56px;height:56px;margin:0 auto 16px;border-radius:50%;font-size:24px;font-weight:800;background:linear-gradient(135deg,var(--gold),var(--gold2));color:#1a0c04}
.step h3{font-size:18px;margin-bottom:8px}
.step p{color:var(--sub);font-size:14.5px}
.sys-switch{display:grid;grid-template-columns:1fr 1fr;gap:26px}
.sys-card{border-radius:22px;padding:38px;text-align:center;border:1px solid var(--line);background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.015))}
.sys-card.android{border-top:3px solid #0fb850}
.sys-card.ios{border-top:3px solid var(--gold)}
.sys-card h3{font-size:22px;margin-bottom:8px}
.sys-card p{color:var(--sub);font-size:14px;margin-bottom:22px}
.dl-btn{display:inline-block;padding:14px 40px;border-radius:40px;font-weight:800;letter-spacing:1px;background:linear-gradient(90deg,var(--gold),var(--gold2));color:#1a0c04;transition:.25s}
.dl-btn:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(255,107,53,.4)}

/* FAQ */
.faq details{background:rgba(255,255,255,.03);border:1px solid var(--line);border-radius:14px;padding:18px 22px;margin-bottom:12px;transition:.2s}
.faq details[open]{border-color:var(--gold);background:rgba(255,181,71,.06)}
.faq summary{cursor:pointer;font-size:17px;font-weight:600;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"＋";color:var(--gold);font-size:22px}
.faq details[open] summary::after{content:"－"}
.faq p{color:var(--sub);font-size:15px;margin-top:12px;padding-top:12px;border-top:1px dashed var(--line)}

/* 页脚 */
.footer{background:#04060f;border-top:1px solid var(--line);padding:60px 0 26px}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1.4fr 1.2fr;gap:32px;margin-bottom:36px}
.foot-slogan{color:var(--sub);margin-top:14px;font-size:14px}
.foot-grid h4{font-size:16px;margin-bottom:14px;color:var(--gold)}
.foot-grid a,.foot-grid p{display:block;color:var(--sub);font-size:14px;margin-bottom:8px;transition:.2s}
.foot-grid a:hover{color:#fff}
.qrcode{width:120px;height:120px;margin:6px 0 10px;border-radius:12px;background:
  radial-gradient(circle at 50% 50%,#fff 1.6px,transparent 1.6px) 0 0/10px 10px,
  #fff;}
.qr-tip{font-size:13px;color:var(--sub)}
.foot-bottom{text-align:center;border-top:1px solid var(--line);padding-top:22px;color:var(--sub);font-size:13px}
.foot-warn{margin-top:8px;color:#ff8f8f}

/* 响应式 */
@media(max-width:900px){
  .hero-inner{grid-template-columns:1fr;text-align:center}
  .hero-phone{order:-1}
  .hero h1{font-size:34px}
  .hero-stats{justify-content:center}
  .grid-4,.steps{grid-template-columns:repeat(2,1fr)}
  .sys-switch{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .nav-links{display:none}
}
@media(max-width:520px){
  .section{padding:60px 0}
  .sec-head h2{font-size:26px}
  .grid-4,.steps{grid-template-columns:1fr}
  .float-btn{padding:16px 30px;font-size:17px;width:100%;justify-content:center}
  .hero-actions{flex-direction:column;width:100%}
  .foot-grid{grid-template-columns:1fr}
}