/* === 火绒安全 - 暗夜极客绿风 === */
:root {
  --bg: #0b0e11;
  --bg2: #14181e;
  --bg3: #1c2129;
  --card: #161b22;
  --bdr: #252a33;
  --bdr-l: #2d3340;
  --txt: #e8ecf1;
  --txt2: #9ba3af;
  --txt3: #5f6878;
  --grn: #22c55e;
  --grn-d: #16a34a;
  --grn-l: rgba(34,197,94,.08);
  --r: 16px;
  --rs: 10px;
  --sh: 0 2px 12px rgba(0,0,0,.4);
  --sh-lg: 0 8px 36px rgba(0,0,0,.5);
  --fx: cubic-bezier(.34,1.56,.64,1);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--txt);line-height:1.7;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}img{max-width:100%}

/* Nav */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:999;
  background:rgba(11,14,17,.92);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid var(--bdr);
}
.nav-in{
  max-width:1280px;margin:0 auto;padding:0 36px;height:64px;
  display:flex;align-items:center;justify-content:space-between;
}
.nav-logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:17px;letter-spacing:-.3px}
.nav-logo .lg{width:32px;height:32px;border-radius:8px;background:var(--grn);display:grid;place-items:center;color:#0b0e11;font-size:14px;font-weight:900}
.nav-logo span{color:var(--grn)}
.nav-links{display:flex;align-items:center;gap:2px}
.nav-links a{padding:7px 14px;border-radius:8px;font-size:13px;font-weight:500;color:var(--txt2);transition:all .25s}
.nav-links a:hover{color:var(--txt);background:var(--bg3)}
.nav-links a.btn-nav{background:var(--grn);color:#0b0e11;font-weight:700;padding:9px 20px;border-radius:24px;box-shadow:0 4px 16px rgba(34,197,94,.25)}
.nav-links a.btn-nav:hover{background:var(--grn-d);transform:translateY(-1px);box-shadow:0 8px 24px rgba(34,197,94,.4)}
.nav-tgl{display:none;background:none;border:none;color:var(--txt);font-size:24px;cursor:pointer}

/* Hero */
.hero{
  padding:160px 0 100px;position:relative;overflow:hidden;
  background:
    radial-gradient(ellipse 60% 40% at 30% 10%,rgba(34,197,94,.04) 0%,transparent 55%),
    radial-gradient(ellipse 30% 30% at 70% 80%,rgba(34,197,94,.03) 0%,transparent 50%);
}
.hero::after{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.02'/%3E%3C/svg%3E");pointer-events:none;z-index:0}
.hero-in{
  max-width:1280px;margin:0 auto;padding:0 36px;
  display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:center;position:relative;z-index:1;
}
.hero-l .tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 14px;border-radius:20px;background:var(--grn-l);border:1px solid rgba(34,197,94,.12);
  color:var(--grn);font-size:12px;font-weight:700;margin-bottom:28px;
}
.hero-l .tag .dot{width:6px;height:6px;border-radius:50%;background:var(--grn);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.3}}
.hero-l h1{font-size:clamp(34px,5.5vw,54px);font-weight:900;line-height:1.06;letter-spacing:-1.2px;margin-bottom:20px}
.hero-l h1 em{font-style:normal;color:var(--grn)}
.hero-l .desc{font-size:15px;color:var(--txt2);line-height:1.75;margin-bottom:36px;max-width:460px}
.hero-btns{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.hero-btns .tip{font-size:12px;color:var(--txt3)}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 28px;border-radius:24px;font-size:14px;font-weight:600;transition:all .3s var(--fx);cursor:pointer;border:none;white-space:nowrap}
.btn-pri{background:var(--grn);color:#0b0e11;font-weight:700;box-shadow:0 6px 20px rgba(34,197,94,.25)}
.btn-pri:hover{background:var(--grn-d);transform:translateY(-2px);box-shadow:0 12px 30px rgba(34,197,94,.4)}
.btn-out{background:transparent;color:var(--txt);border:1.5px solid var(--bdr-l)}
.btn-out:hover{border-color:var(--grn);color:var(--grn)}
.btn-ghost{background:var(--bg3);color:var(--txt2)}
.btn-ghost:hover{background:var(--bdr);color:var(--txt)}

/* Hero Visual */
.hero-r{position:relative;display:flex;justify-content:center}
.term{
  background:var(--card);border:1px solid var(--bdr);border-radius:12px;
  overflow:hidden;width:100%;max-width:380px;box-shadow:var(--sh-lg);
}
.term-bar{padding:8px 14px;background:var(--bg3);border-bottom:1px solid var(--bdr);display:flex;align-items:center;gap:6px}
.term-bar .td{width:10px;height:10px;border-radius:50%}
.term-bar .td:nth-child(1){background:#ef4444}
.term-bar .td:nth-child(2){background:#f59e0b}
.term-bar .td:nth-child(3){background:#22c55e}
.term-bar span:last-child{margin-left:10px;font-size:10px;color:var(--txt3)}
.term-body{padding:16px 18px;font-family:"SF Mono","Fira Code","Consolas",monospace;font-size:11px;line-height:2;color:var(--grn)}
.term-body .prompt{color:var(--txt3)}
.term-body .cmd{color:var(--grn);font-weight:700}
.term-body .ok{color:#22c55e}
.term-body .dim{color:var(--txt3)}
.float-card{
  position:absolute;bottom:-16px;right:-10px;
  background:var(--card);border:1px solid var(--bdr);border-radius:10px;
  padding:12px 18px;box-shadow:var(--sh);display:flex;align-items:center;gap:10px;
}
.float-card .fc-i{width:34px;height:34px;border-radius:8px;background:var(--grn-l);display:grid;place-items:center;font-size:16px}
.float-card .fc-t strong{display:block;font-size:11px;color:var(--txt)}
.float-card .fc-t span{font-size:9px;color:var(--txt3)}

/* Stats */
.strip{max-width:1280px;margin:0 auto;padding:0 36px 80px;position:relative;z-index:1}
.strip-in{
  display:flex;align-items:center;justify-content:center;gap:48px;flex-wrap:wrap;
  background:var(--card);border:1px solid var(--bdr);border-radius:var(--r);
  padding:32px 48px;box-shadow:var(--sh);
}
.st{padding:0 28px;text-align:center;border-right:1px solid var(--bdr)}
.st:last-child{border-right:none}
.st .st-num{font-size:32px;font-weight:900;color:var(--grn);letter-spacing:-.5px}
.st .st-lbl{font-size:11px;color:var(--txt3);margin-top:4px}

/* Sections */
.sec{max-width:1280px;margin:0 auto;padding:60px 36px}
.sec-hd{text-align:center;margin-bottom:52px}
.sec-hd .badge{display:inline-block;padding:5px 14px;border-radius:20px;background:var(--grn-l);color:var(--grn);font-size:12px;font-weight:700;letter-spacing:.6px;margin-bottom:16px}
.sec-hd h2{font-size:clamp(26px,4vw,38px);font-weight:800;letter-spacing:-.5px;margin-bottom:10px}
.sec-hd p{color:var(--txt3);font-size:14px;max-width:500px;margin:0 auto}

/* Features */
.feat-wrap{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.feat{
  background:var(--card);border:1px solid var(--bdr);border-radius:var(--r);
  padding:32px 28px;display:flex;gap:18px;transition:all .3s var(--fx);
}
.feat:hover{transform:translateY(-3px);border-color:rgba(34,197,94,.18);box-shadow:var(--sh-lg)}
.feat .f-ico{width:48px;height:48px;border-radius:10px;background:var(--grn-l);display:grid;place-items:center;font-size:20px;flex-shrink:0}
.feat h3{font-size:16px;font-weight:700;margin-bottom:6px}
.feat p{font-size:12px;color:var(--txt3);line-height:1.7}

/* Why section - dark zone */
.dark-zone{background:var(--bg2);border-top:1px solid var(--bdr);border-bottom:1px solid var(--bdr)}
.why-row{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.why{
  background:var(--card);border:1px solid var(--bdr);border-radius:var(--r);
  padding:32px 24px;text-align:center;transition:all .3s
}
.why:hover{transform:translateY(-3px);border-color:rgba(34,197,94,.14);box-shadow:var(--sh)}
.why .w-ico{font-size:36px;margin-bottom:12px;display:block}
.why h3{font-size:15px;font-weight:700;margin-bottom:6px}
.why p{font-size:12px;color:var(--txt3);line-height:1.6}

/* Layers */
.layers{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.layer{
  background:var(--card);border:1px solid var(--bdr);border-radius:var(--r);
  padding:30px 24px;transition:all .3s;position:relative;overflow:hidden
}
.layer:hover{border-color:rgba(34,197,94,.15);box-shadow:var(--sh)}
.layer .l-num{font-size:56px;font-weight:900;color:rgba(34,197,94,.06);position:absolute;top:10px;right:18px;line-height:1}
.layer h3{font-size:16px;font-weight:700;margin-bottom:8px;position:relative;z-index:1}
.layer p{font-size:12px;color:var(--txt3);line-height:1.7;position:relative;z-index:1}
.layer .l-tag{display:inline-block;padding:3px 10px;border-radius:4px;font-size:10px;font-weight:700;background:var(--grn-l);color:var(--grn);margin-bottom:10px}

/* Data */
.data-row{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.dc{background:var(--card);border:1px solid var(--bdr);border-radius:var(--r);padding:28px 20px;text-align:center;transition:all .3s}
.dc:hover{transform:translateY(-2px);border-color:rgba(34,197,94,.12);box-shadow:var(--sh)}
.dc .d-num{font-size:30px;font-weight:900;color:var(--grn)}
.dc .d-lbl{font-size:11px;color:var(--txt3);margin-top:6px}

/* FAQ */
.faq{max-width:720px;margin:0 auto;display:flex;flex-direction:column;gap:8px}
.faq-item{background:var(--card);border:1px solid var(--bdr);border-radius:var(--rs);overflow:hidden;transition:all .25s}
.faq-q{
  width:100%;padding:18px 24px;background:none;border:none;
  font-family:inherit;font-size:14px;font-weight:600;color:var(--txt);
  text-align:left;cursor:pointer;display:flex;justify-content:space-between;align-items:center;
}
.faq-q .arr{font-size:12px;color:var(--grn);transition:transform .3s}
.faq-a{font-size:13px;color:var(--txt2);line-height:1.8;padding:0 24px 18px;display:none}
.faq-item.open .faq-a{display:block}
.faq-item.open .arr{transform:rotate(180deg)}

/* CTA */
.cta-wrap{max-width:1280px;margin:0 auto;padding:60px 36px}
.cta{
  background:linear-gradient(135deg,var(--card) 0%,rgba(34,197,94,.04) 100%);
  border:1px solid rgba(34,197,94,.08);border-radius:var(--r);
  padding:64px 48px;text-align:center;
}
.cta h2{font-size:clamp(26px,4vw,34px);font-weight:800;margin-bottom:12px}
.cta p{color:var(--txt2);font-size:15px;margin-bottom:28px}
.cta-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* Footer */
.ft{background:var(--bg2);border-top:1px solid var(--bdr)}
.ft-grid{
  max-width:1280px;margin:0 auto;padding:56px 36px 32px;
  display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:48px;
}
.ft-b .ft-logo{display:flex;align-items:center;gap:8px;font-size:16px;font-weight:800;margin-bottom:12px}
.ft-b .ft-logo .fl{width:28px;height:28px;border-radius:8px;background:var(--grn);display:grid;place-items:center;color:#0b0e11;font-size:12px;font-weight:900}
.ft-b .ft-logo em{font-style:normal;color:var(--grn)}
.ft-b p{font-size:12px;color:var(--txt3);line-height:1.7;max-width:240px}
.ft-c h4{font-size:12px;font-weight:700;margin-bottom:14px;text-transform:uppercase;letter-spacing:.6px;color:var(--txt2)}
.ft-c a{display:block;font-size:12px;color:var(--txt3);padding:5px 0;transition:color .2s}
.ft-c a:hover{color:var(--grn)}
.ft-btm{
  max-width:1280px;margin:0 auto;padding:16px 36px;border-top:1px solid var(--bdr);
  display:flex;justify-content:space-between;font-size:11px;color:var(--txt3);flex-wrap:wrap;gap:8px;
}

/* ============= Download ============= */
.dl-hero{padding:140px 0 60px;text-align:center}
.dl-hero h1{font-size:clamp(28px,4vw,40px);font-weight:900;margin-bottom:12px}
.dl-hero .dl-sub{color:var(--txt2);font-size:15px;margin-bottom:20px;max-width:560px;margin-inline:auto}
.dl-meta{display:inline-flex;gap:20px;font-size:12px;color:var(--txt3);flex-wrap:wrap;justify-content:center}
.dl-grid{max-width:1280px;margin:0 auto 56px;padding:0 36px;display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.dl-card{
  background:var(--card);border:1px solid var(--bdr);border-radius:var(--r);
  padding:32px 26px;text-align:center;transition:all .3s var(--fx);
  display:flex;flex-direction:column;gap:14px
}
.dl-card:hover{transform:translateY(-4px);border-color:var(--grn);box-shadow:var(--sh-lg)}
.dl-card .dl-tag{padding:4px 14px;border-radius:20px;font-size:11px;font-weight:700;background:var(--grn-l);color:var(--grn);align-self:center}
.dl-card h3{font-size:17px;font-weight:700}
.dl-card .dl-feats{display:flex;flex-wrap:wrap;gap:6px;justify-content:center}
.dl-card .dl-feats span{padding:3px 10px;font-size:10px;border-radius:4px;background:var(--bg3);color:var(--txt3)}
.dl-card .dl-size{font-size:11px;color:var(--txt3)}
.dl-steps{max-width:1280px;margin:0 auto 56px;padding:0 36px;display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.dl-step{display:flex;gap:14px;align-items:flex-start;background:var(--card);border:1px solid var(--bdr);border-radius:var(--rs);padding:22px 20px}
.dl-step .step-n{width:32px;height:32px;border-radius:8px;background:var(--grn);color:#0b0e11;display:grid;place-items:center;font-size:13px;font-weight:800;flex-shrink:0}
.dl-step .step-txt strong{display:block;font-size:13px;margin-bottom:4px}
.dl-step .step-txt p{font-size:11px;color:var(--txt3);line-height:1.5}
.dl-spec{max-width:800px;margin:0 auto;background:var(--card);border:1px solid var(--bdr);border-radius:var(--r);overflow:hidden}
.dl-spec .sr{display:grid;grid-template-columns:140px 1fr;border-bottom:1px solid var(--bdr)}
.dl-spec .sr:last-child{border-bottom:none}
.dl-spec .sl{padding:14px 20px;background:var(--bg3);font-size:12px;font-weight:700;color:var(--grn)}
.dl-spec .sv{padding:14px 20px;font-size:12px;color:var(--txt2)}
.dl-check{max-width:800px;margin:0 auto;display:flex;flex-direction:column;gap:14px}
.chk{display:flex;gap:16px;align-items:flex-start;background:var(--card);border:1px solid var(--bdr);border-radius:var(--rs);padding:22px 20px}
.chk .chk-icon{font-size:22px;flex-shrink:0}
.chk strong{display:block;font-size:13px;margin-bottom:4px}
.chk p{font-size:11px;color:var(--txt3);line-height:1.5}

/* ============= 404 ============= */
.err-page{min-height:100vh;display:grid;place-items:center;background:var(--bg);padding:24px}
.err-box{
  max-width:500px;text-align:center;background:var(--card);
  border:1px solid var(--bdr);border-radius:var(--r);padding:60px 48px;box-shadow:var(--sh-lg)
}
.err-box .e404{font-size:clamp(80px,14vw,130px);font-weight:900;color:var(--grn);line-height:1;margin-bottom:4px}
.err-box h1{font-size:20px;font-weight:700;margin-bottom:10px}
.err-box p{color:var(--txt3);font-size:13px;line-height:1.7;margin-bottom:28px}
.err-box .e-btns{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}

/* ============= Responsive ============= */
@media(max-width:1024px){
  .hero-in{grid-template-columns:1fr;gap:48px;text-align:center}
  .hero-l .desc{margin-inline:auto}
  .hero-btns{justify-content:center}
  .hero-r{display:none}
  .feat-wrap{grid-template-columns:1fr}
  .why-row,.layers{grid-template-columns:repeat(2,1fr)}
  .data-row{grid-template-columns:repeat(2,1fr)}
  .ft-grid{grid-template-columns:repeat(2,1fr)}
  .dl-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .nav-links{display:none}
  .nav-tgl{display:block}
  .nav-links.open{display:flex;flex-direction:column;position:absolute;top:64px;left:0;right:0;background:var(--card);border-bottom:1px solid var(--bdr);padding:12px 20px;gap:4px;z-index:99}
  .hero{padding:130px 0 60px}
  .feat-wrap,.why-row,.layers,.dl-grid,.dl-steps{grid-template-columns:1fr}
  .data-row{grid-template-columns:repeat(2,1fr)}
  .ft-grid{grid-template-columns:1fr;gap:32px}
  .sec{padding:48px 20px}
  .cta{padding:44px 24px}
  .strip-in{flex-direction:column;gap:24px;padding:28px 32px}
  .st{border-right:none;border-bottom:1px solid var(--bdr);padding:12px 0}
  .st:last-child{border-bottom:none}
}