/* ===== 火绒安全 - 官网蓝橙安全专业风 ===== */
:root {
  --bg: #ffffff;
  --bg2: #f6f8fb;
  --bg3: #edf0f5;
  --card: #ffffff;
  --card-hover: #fafbfd;
  --border: #e2e6ee;
  --border-light: #eef1f7;
  --text: #1a1d2e;
  --text2: #5a6072;
  --text3: #8f95ab;
  --blue: #2b6cb0;
  --blue-light: #3182ce;
  --blue-dark: #1e4e8a;
  --orange: #f04e23;
  --orange-light: #f5673f;
  --green: #2f855a;
  --green-light: #38a169;
  --grad: linear-gradient(135deg, #2b6cb0, #3182ce);
  --grad-warm: linear-gradient(135deg, #f04e23, #f59e0b);
  --grad-soft: linear-gradient(135deg, rgba(43,108,176,0.04), rgba(49,130,206,0.04));
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 4px 24px rgba(0,0,0,0.06);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.1);
  --trans: 0.3s cubic-bezier(0.4,0,0.2,1);
}
*,*::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(--text);line-height:1.65;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

/* 导航 - 白色专业风 */
.nav-bar{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  background:rgba(255,255,255,0.94);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid var(--border);box-shadow:0 1px 3px rgba(0,0,0,0.03);
}
.nav-inner{
  max-width:1240px;margin:0 auto;padding:0 32px;height:66px;
  display:flex;align-items:center;justify-content:space-between;
}
.nav-brand{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:800;letter-spacing:-0.3px}
.nav-brand img{width:30px;height:30px}
.nav-brand .accent{color:var(--blue)}
.nav-menu{display:flex;align-items:center;gap:4px}
.nav-menu a{padding:9px 18px;border-radius:8px;font-size:14px;font-weight:500;color:var(--text2);transition:all var(--trans)}
.nav-menu a:hover{color:var(--blue);background:rgba(43,108,176,0.04)}
.nav-menu a.btn-nav{background:var(--grad-warm);color:#fff;font-weight:600;border-radius:8px;padding:10px 22px;box-shadow:0 4px 14px rgba(240,78,35,0.3)}
.nav-menu a.btn-nav:hover{transform:translateY(-1px);box-shadow:0 6px 22px rgba(240,78,35,0.4)}
.nav-toggle{display:none;background:none;border:none;color:var(--text);font-size:24px;cursor:pointer}

/* Hero */
.hero{
  padding:140px 0 80px;position:relative;overflow:hidden;
  background:linear-gradient(180deg,#eff4fb 0%,#f6f8fb 50%,#fff 100%);
}
.hero-grid{
  max-width:1240px;margin:0 auto;padding:0 32px;
  display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:center;
  position:relative;z-index:1
}
.hero-text .tag{
  display:inline-flex;align-items:center;gap:8px;
  padding:5px 16px;border-radius:8px;
  background:rgba(47,133,90,0.06);border:1px solid rgba(47,133,90,0.12);
  color:var(--green);font-size:12px;font-weight:700;margin-bottom:28px
}
.hero-text .tag::before{content:"";width:6px;height:6px;background:var(--green-light);border-radius:50%;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:0.4}}
.hero-text h1{font-size:clamp(34px,5vw,52px);font-weight:900;line-height:1.08;letter-spacing:-1px;margin-bottom:20px}
.hero-text h1 .hl{color:var(--blue)}
.hero-text .desc{font-size:16px;color:var(--text3);line-height:1.8;margin-bottom:34px;max-width:480px}
.hero-btns{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.hero-btns .ver{font-size:12px;color:var(--text3);margin-left:8px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer;transition:all var(--trans);border:none;white-space:nowrap}
.btn-fill{background:var(--blue);color:#fff;box-shadow:0 8px 24px rgba(43,108,176,0.3)}
.btn-fill:hover{background:var(--blue-dark);transform:translateY(-2px);box-shadow:0 14px 36px rgba(43,108,176,0.4)}
.btn-line{background:var(--bg);color:var(--text);border:1px solid var(--border)}
.btn-line:hover{border-color:var(--blue);color:var(--blue)}
.btn-dark{background:#1a202c;color:#fff;box-shadow:0 8px 24px rgba(26,32,44,0.3)}
.btn-dark:hover{background:#2d3748;transform:translateY(-2px);box-shadow:0 14px 36px rgba(26,32,44,0.4)}
.btn-outline{background:var(--bg);color:var(--text);border:1px solid var(--border)}
.btn-outline:hover{border-color:var(--text2)}
.btn-muted{background:var(--bg2);color:var(--text);border:1px solid var(--border)}
.btn-muted:hover{background:var(--bg3)}

/* 安全面板mockup */
.sec-visual{position:relative}
.sec-window,.sec-panel{
  background:#fff;border:1px solid var(--border);
  border-radius:16px;overflow:hidden;box-shadow:var(--shadow-lg)
}
.sec-topbar{padding:14px 20px;background:linear-gradient(135deg,#1a2332,#2d3748);display:flex;align-items:center;gap:10px}
.sec-dot{width:10px;height:10px;border-radius:50%}
.sec-dot.r{background:#ff5f56}.sec-dot.y{background:#ffbd2e}.sec-dot.g{background:#27c93f}
.sec-topbar span{font-size:11px;color:rgba(255,255,255,0.7);margin-left:4px}
.sec-body{padding:24px}
.sec-status{
  display:flex;align-items:center;gap:12px;padding:16px 20px;
  background:rgba(47,133,90,0.06);border:1px solid rgba(47,133,90,0.12);
  border-radius:10px;margin-bottom:20px
}
.sec-status .ss-dot{width:10px;height:10px;background:var(--green-light);border-radius:50%;box-shadow:0 0 8px rgba(47,133,90,0.4);animation:pulse 2s infinite}
.sec-status .ss-text strong{display:block;font-size:14px;color:var(--green)}
.sec-status .ss-text span{font-size:11px;color:var(--text3)}
.sec-feat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.sec-feat{display:flex;align-items:center;gap:10px;padding:10px 14px;background:var(--bg2);border-radius:8px;font-size:12px;color:var(--text2)}
.sec-feat .sf-icon{font-size:16px;flex-shrink:0}
.sec-badge{
  position:absolute;bottom:-14px;right:-8px;
  background:#fff;border:1px solid var(--border);
  border-radius:10px;padding:12px 18px;box-shadow:var(--shadow);
  display:flex;align-items:center;gap:8px
}
.sec-badge strong{color:var(--green);font-size:12px}

/* 信任条 */
.trust-strip{
  max-width:1240px;margin:0 auto;padding:0 32px 72px;position:relative;z-index:1
}
.trust-inner{
  background:var(--grad-soft);border:1px solid var(--border);
  border-radius:var(--radius);padding:28px 44px;
  display:flex;align-items:center;justify-content:center;gap:48px;flex-wrap:wrap
}
.trust-inner .hi{text-align:center}
.hi .hin{font-size:28px;font-weight:900;color:var(--blue)}
.hi .hil{font-size:12px;color:var(--text3);margin-top:4px}

/* 区块 */
.sec{max-width:1240px;margin:0 auto;padding:80px 32px}
.sec-head{text-align:center;margin-bottom:56px}
.sec-head .label{
  display:inline-block;padding:5px 16px;border-radius:8px;
  background:rgba(43,108,176,0.06);border:1px solid rgba(43,108,176,0.12);
  color:var(--blue);font-size:12px;font-weight:700;letter-spacing:1px;margin-bottom:16px
}
.sec-head h2{font-size:clamp(28px,4vw,40px);font-weight:800;letter-spacing:-0.5px;margin-bottom:12px}
.sec-head p{color:var(--text3);font-size:16px;max-width:520px;margin:0 auto}

/* 功能卡片 */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feat-card{
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);padding:32px 26px;text-align:center;
  transition:all var(--trans);position:relative;overflow:hidden
}
.feat-card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:4px;
  background:linear-gradient(90deg,var(--blue),var(--green-light))
}
.feat-card:hover{border-color:rgba(43,108,176,0.2);transform:translateY(-3px);box-shadow:var(--shadow)}
.feat-card .fc-icon{font-size:36px;margin-bottom:14px;display:block}
.feat-card h3{font-size:16px;font-weight:700;margin-bottom:8px}
.feat-card p{font-size:13px;color:var(--text3);line-height:1.7}

/* 安全理念 - 深色区 */
.dark-zone{
  background:#1a202c;border-top:1px solid rgba(255,255,255,0.06);border-bottom:1px solid rgba(255,255,255,0.06)
}
.defense-row{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.defense-card{
  background:rgba(255,255,255,0.04);border:1px solid rgba(255,255,255,0.08);
  border-radius:var(--radius);padding:36px 28px;text-align:center;
  transition:all var(--trans);position:relative
}
.defense-card::before{
  content:attr(data-num);position:absolute;top:16px;right:20px;
  font-size:48px;font-weight:900;color:rgba(255,255,255,0.04);
  line-height:1
}
.defense-card:hover{border-color:rgba(47,133,90,0.3);transform:translateY(-2px);box-shadow:0 0 32px rgba(47,133,90,0.08)}
.defense-card .di{font-size:40px;margin-bottom:12px;display:block}
.defense-card h3{font-size:17px;font-weight:700;color:#fff;margin-bottom:8px}
.defense-card p{font-size:13px;color:rgba(255,255,255,0.45);line-height:1.7}

/* 安全层级 */
.layer-row{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.layer-card{
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);padding:28px 24px;display:flex;gap:16px;
  transition:all var(--trans)
}
.layer-card:hover{border-color:rgba(43,108,176,0.2);box-shadow:var(--shadow);transform:translateY(-2px)}
.layer-card .l-num{font-size:36px;font-weight:900;color:var(--border);flex-shrink:0;line-height:1}
.layer-card h3{font-size:15px;font-weight:700;margin-bottom:6px}
.layer-card p{font-size:12px;color:var(--text3);line-height:1.7}

/* 数据信任 */
.data-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.data-card{
  background:rgba(255,255,255,0.04);border:1px solid rgba(255,255,255,0.08);
  border-radius:var(--radius);padding:28px 20px;text-align:center
}
.data-card .d-num{font-size:34px;font-weight:900;color:var(--green-light);margin-bottom:4px}
.data-card .d-label{font-size:13px;color:rgba(255,255,255,0.7)}
.data-card .d-sub{font-size:11px;color:rgba(255,255,255,0.35);margin-top:4px}

/* FAQ */
.faq-wrap{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:10px}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden}
.faq-q{
  width:100%;padding:20px 24px;background:none;border:none;
  color:var(--text);font-size:15px;font-weight:600;text-align:left;
  cursor:pointer;display:flex;justify-content:space-between;align-items:center;
  font-family:inherit
}
.faq-q .arrow{font-size:11px;color:var(--blue);transition:transform var(--trans)}
.faq-a{padding:0 24px 20px;font-size:14px;color:var(--text3);line-height:1.8;display:none}
.faq-item.open .faq-a{display:block}
.faq-item.open .arrow{transform:rotate(180deg)}

/* CTA - 蓝绿渐变 */
.cta-box{
  background:linear-gradient(135deg,var(--blue-dark),#1a4a2e);border:1px solid rgba(255,255,255,0.08);
  border-radius:var(--radius);padding:64px 48px;text-align:center;color:#fff
}
.cta-box h2{font-size:clamp(28px,4vw,38px);font-weight:800;margin-bottom:12px;color:#fff}
.cta-box p{color:rgba(255,255,255,0.7);font-size:16px;margin-bottom:30px}
.cta-box .cta-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.cta-box .btn-fill{background:var(--grad-warm)}

/* Footer */
.footer{background:var(--bg2);border-top:1px solid var(--border)}
.footer-grid{
  max-width:1240px;margin:0 auto;padding:56px 32px 28px;
  display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:48px
}
.footer-brand .fl{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:800;margin-bottom:12px}
.footer-brand .fl img{width:28px;height:28px}
.footer-brand .fl .fc{color:var(--blue)}
.footer-brand p{font-size:13px;color:var(--text3);line-height:1.7;max-width:260px}
.footer-col h4{font-size:14px;font-weight:700;margin-bottom:16px}
.footer-col a{display:block;font-size:13px;color:var(--text3);padding:5px 0;transition:color var(--trans)}
.footer-col a:hover{color:var(--blue)}
.footer-bottom{
  max-width:1240px;margin:0 auto;padding:18px 32px;
  border-top:1px solid var(--border);
  display:flex;justify-content:space-between;font-size:12px;color:var(--text3);
  flex-wrap:wrap;gap:12px
}

/* Download */
.dl-hero{padding:132px 0 60px;text-align:center;background:linear-gradient(180deg,#eff4fb 0%,#f6f8fb 50%,#fff 100%)}
.dl-hero-inner{max-width:760px;margin:0 auto;padding:0 32px}
.dl-hero-inner h1{font-size:clamp(30px,5vw,46px);font-weight:900;margin-bottom:12px}
.dl-hero-inner .dl-sub{color:var(--text3);font-size:15px;margin-bottom:20px}
.dl-meta{display:inline-flex;gap:20px;font-size:13px;color:var(--text2);flex-wrap:wrap}
.dl-main{max-width:1240px;margin:0 auto 60px;padding:0 32px;display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.dl-grid{max-width:1240px;margin:0 auto 60px;padding:0 32px;display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.dl-card{
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);padding:36px 28px;text-align:center;
  transition:all var(--trans);display:flex;flex-direction:column;align-items:center;gap:14px
}
.dl-card:hover{border-color:var(--blue);transform:translateY(-2px);box-shadow:var(--shadow)}
.dl-card .dl-tag{display:inline-block;padding:4px 14px;border-radius:8px;font-size:12px;font-weight:700;background:rgba(43,108,176,0.08);color:var(--blue);align-self:center}
.dl-card h3{font-size:20px;font-weight:700}
.dl-card .dl-ver{font-size:13px;color:var(--text3)}
.dl-card .dl-info{font-size:13px;color:var(--text3);line-height:1.6}
.dl-card .dl-feats{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}
.dl-card .dl-feats span{padding:5px 12px;border-radius:6px;background:rgba(43,108,176,0.05);font-size:12px;color:var(--text2)}
.dl-card .dl-size{font-size:12px;color:var(--text3)}
.dl-card .btn{width:100%;justify-content:center}
.dl-check{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:14px}
.chk{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-sm);padding:20px;display:flex;gap:14px;align-items:flex-start}
.chk .chk-icon{font-size:24px;flex-shrink:0}
.chk strong{display:block;font-size:14px;margin-bottom:4px}
.chk p{font-size:12px;color:var(--text3);line-height:1.6}
.dl-tips{max-width:1240px;margin:0 auto 60px;padding:0 32px;display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.dl-tips .tp{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-sm);padding:24px 20px;display:flex;gap:14px;align-items:flex-start}
.tp .tp-num{width:30px;height:30px;border-radius:8px;background:rgba(43,108,176,0.08);color:var(--blue);display:grid;place-items:center;font-size:14px;font-weight:800;flex-shrink:0}
.tp strong{display:block;font-size:14px;margin-bottom:4px}
.tp p{font-size:12px;color:var(--text3);line-height:1.6}

.sec.sm{padding-top:0}
.specs-box{max-width:760px;margin:0 auto;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.sp-row{display:grid;grid-template-columns:160px 1fr;border-bottom:1px solid var(--border)}
.sp-row:last-child{border-bottom:none}
.sp-label{padding:15px 20px;background:var(--bg2);font-size:13px;font-weight:700;color:var(--blue)}
.sp-value{padding:15px 20px;font-size:13px;color:var(--text2)}
.specs-tbl{max-width:760px;margin:0 auto;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.specs-tbl .sr{display:grid;grid-template-columns:160px 1fr;border-bottom:1px solid var(--border)}
.specs-tbl .sr:last-child{border-bottom:none}
.specs-tbl .sl{padding:15px 20px;background:var(--bg2);font-size:13px;font-weight:700;color:var(--blue)}
.specs-tbl .sv{padding:15px 20px;font-size:13px;color:var(--text2)}

/* 404 */
.err-wrap{min-height:100vh;display:grid;place-items:center;padding:32px;background:var(--bg)}
.err-card{
  max-width:500px;text-align:center;
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);padding:60px 48px;box-shadow:var(--shadow-lg)
}
.err-card .err-num{font-size:clamp(90px,16vw,140px);font-weight:900;background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:0.9;margin-bottom:8px}
.err-card h1{font-size:21px;font-weight:700;margin-bottom:12px}
.err-card p{color:var(--text3);font-size:14px;line-height:1.7;margin-bottom:28px}
.err-card .err-btns{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}

@media(max-width:1024px){
  .hero-grid{grid-template-columns:1fr;gap:44px}
  .feat-grid{grid-template-columns:repeat(2,1fr)}
  .defense-row{grid-template-columns:1fr;max-width:420px;margin:0 auto}
  .dl-main,.dl-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .nav-menu{display:none}
  .nav-toggle{display:block}
  .nav-menu.open{display:flex;flex-direction:column;position:absolute;top:66px;left:0;right:0;background:#fff;border-bottom:1px solid var(--border);padding:12px 24px;gap:4px;z-index:99}
  .hero{padding:120px 0 50px}
  .feat-grid{grid-template-columns:1fr}
  .dl-main,.dl-grid,.dl-tips{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .sec{padding:52px 20px}
  .cta-box{padding:44px 24px}
}