:root{
  --brand:#14b8a6;
  --brand-dark:#0f9688;
  --ink:#f9fafb;
  --muted:#9ca3af;
  --bg:#0f172a;
  --bg-card:#1e293b;
  --card:#334155;
  --border:#475569;
  --accent:#06b6d4;
  --radius:16px;
  --shadow:0 20px 50px rgba(0,0,0,.3);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:'Inter',-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,"Noto Sans","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.6}
a{color:var(--brand);text-decoration:none;transition:color .2s}
a:hover{color:var(--accent)}
.container{max-width:100%;margin:0 auto;padding:0 24px}
.topbar{display:flex;align-items:center;justify-content:space-between;padding:20px 24px;background:rgba(30,41,59,.6);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}
.brand{display:flex;align-items:center;gap:12px;font-weight:700;font-size:22px;color:var(--ink)}
.brand .logo{width:40px;height:40px;object-fit:contain;filter:drop-shadow(0 0 8px rgba(20,184,166,.5))}
.lang{display:flex;gap:8px;font-size:14px}
.lang a{padding:8px 14px;border-radius:8px;background:transparent;border:1px solid var(--border);color:var(--muted);transition:all .2s}
.lang a:hover{border-color:var(--brand);color:var(--brand)}
.lang a.active{background:var(--brand);color:#0f172a;border-color:var(--brand)}

/* HERO */
.hero{position:relative;padding:100px 0 80px;overflow:hidden}
.hero::before{content:"";position:absolute;top:-40%;left:50%;width:800px;height:800px;background:radial-gradient(circle,rgba(20,184,166,.15),transparent 70%);transform:translateX(-50%);pointer-events:none;filter:blur(80px)}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;position:relative;z-index:1}
h1{font-size:52px;line-height:1.15;margin:0 0 20px;letter-spacing:-.5px;font-weight:800;background:linear-gradient(135deg,#f9fafb 0%,#cbd5e1 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.kws{display:flex;flex-wrap:wrap;gap:10px;margin:20px 0 24px}
.kw{font-size:12px;padding:8px 14px;border-radius:20px;background:rgba(20,184,166,.1);border:1px solid rgba(20,184,166,.3);color:var(--brand);font-weight:500}
.lead{font-size:18px;color:var(--muted);max-width:560px;line-height:1.8;margin-bottom:32px}
.cta{display:flex;flex-wrap:wrap;gap:16px;margin-bottom:16px}
.btn{display:inline-flex;align-items:center;gap:10px;padding:16px 28px;border-radius:12px;border:2px solid transparent;background:var(--brand);color:#0f172a;font-weight:700;font-size:15px;box-shadow:0 8px 24px rgba(20,184,166,.3);transition:all .2s;cursor:pointer}
.btn:hover{transform:translateY(-2px);box-shadow:0 12px 32px rgba(20,184,166,.4)}
.btn:active{transform:translateY(0)}
.btn.outline{background:transparent;color:var(--brand);border-color:var(--brand);box-shadow:none}
.btn.outline:hover{background:rgba(20,184,166,.1)}
.note{font-size:13px;color:#64748b;font-style:italic}
.shot{display:flex;align-items:center;justify-content:center;position:relative}
.shot::before{content:"";position:absolute;inset:-20%;background:radial-gradient(circle,rgba(6,182,212,.2),transparent 60%);filter:blur(40px);z-index:-1}
.device-img{width:100%;max-width:480px;height:auto;object-fit:contain;filter:drop-shadow(0 20px 60px rgba(0,0,0,.5));transition:transform .4s ease}
.device-img:hover{transform:scale(1.05) rotateY(-5deg)}

/* FEATURES */
.section{padding:80px 0}
.sec-title{margin-bottom:48px;text-align:center}
.sec-title h2{font-size:36px;margin:0 0 12px;font-weight:800;color:var(--ink)}
.sec-title p{color:var(--muted);font-size:16px;margin:0}
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.card{background:var(--bg-card);border-radius:var(--radius);padding:32px;border:1px solid var(--border);position:relative;overflow:hidden;transition:all .3s}
.card::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--brand),var(--accent));opacity:0;transition:opacity .3s}
.card:hover{transform:translateY(-8px);border-color:var(--brand);box-shadow:0 20px 60px rgba(0,0,0,.4)}
.card:hover::before{opacity:1}
.icon{width:56px;height:56px;border-radius:14px;background:rgba(20,184,166,.1);display:grid;place-items:center;margin-bottom:20px;border:1px solid rgba(20,184,166,.2)}
.icon img{width:32px;height:32px}
.card h3{margin:0 0 12px;font-size:20px;font-weight:700;color:var(--ink)}
.card p{margin:0;color:#94a3b8;font-size:15px;line-height:1.7}

/* DOWNLOAD */
.dl{display:grid;grid-template-columns:1.2fr 1fr;gap:24px}
.panel{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:32px;position:relative;overflow:hidden}
.panel::before{content:"";position:absolute;top:0;right:0;width:200px;height:200px;background:radial-gradient(circle,rgba(20,184,166,.08),transparent 70%);pointer-events:none}
.dl h3{font-weight:700;font-size:22px;margin:0 0 24px;color:var(--ink)}
.dl .list{display:grid;gap:16px}
.item{display:flex;align-items:center;justify-content:space-between;padding:20px;border:1px solid var(--border);border-radius:12px;background:rgba(15,23,42,.4);transition:all .2s}
.item:hover{border-color:var(--brand);background:rgba(20,184,166,.05)}
.item strong{font-size:15px;font-weight:600;color:var(--ink)}
.safe{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
.badge{padding:8px 14px;border-radius:20px;background:rgba(20,184,166,.1);border:1px solid rgba(20,184,166,.2);color:var(--brand);font-size:12px;font-weight:500}

/* FAQ & SEO TEXT */
.faq{display:grid;gap:12px}
details{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:18px 20px;transition:all .2s}
details:hover{border-color:var(--brand)}
details[open]{background:rgba(20,184,166,.05)}
summary{cursor:pointer;font-weight:600;color:var(--ink);font-size:15px}
.seo-copy{color:#94a3b8;font-size:15px;line-height:1.9;background:var(--bg-card);padding:32px;border-radius:var(--radius);border:1px solid var(--border)}
.seo-copy strong{color:var(--brand)}
.seo-copy em{color:var(--accent);font-style:normal}

/* FOOTER */
footer{padding:60px 0 40px;background:var(--bg-card);border-top:1px solid var(--border)}
.footgrid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:40px;margin-bottom:32px}
.footgrid h4{margin:0 0 16px;font-weight:700;font-size:16px;color:var(--ink)}
.footgrid a{color:var(--muted)}
.footgrid a:hover{color:var(--brand)}
.mini{font-size:14px;line-height:1.8;color:var(--muted)}
.copyright{border-top:1px solid var(--border);padding-top:20px;text-align:center;color:#64748b;font-size:13px}

/* Responsive */
@media (max-width:1024px){
  h1{font-size:42px}
  .hero-grid{grid-template-columns:1fr;text-align:center;gap:48px}
  .shot{grid-row-start:1;margin-bottom:0}
  .kws{justify-content:center}
  .cta{justify-content:center}
  .lead{margin-left:auto;margin-right:auto}
  .device-img{transform:none}
  .cards{grid-template-columns:repeat(2,1fr)}
  .dl{grid-template-columns:1fr}
  .footgrid{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  .topbar{padding:16px 20px}
  .hero{padding:60px 0 40px}
  h1{font-size:32px;line-height:1.2}
  .lead{font-size:16px}
  .section{padding:48px 0}
  .sec-title h2{font-size:28px}
  .cards{grid-template-columns:1fr}
  .footgrid{grid-template-columns:1fr}
  .btn{width:100%;justify-content:center}
  .item{flex-direction:column;gap:12px;align-items:flex-start}
  .item .btn{margin-top:8px}
}