/* ===== 搜狗浏览器 - 智能浏览器·紫蓝渐变风 ===== */
:root {
  --bg: #ffffff;
  --bg2: #f6f7fb;
  --bg3: #eceef5;
  --card: #ffffff;
  --border: #e4e6f0;
  --border-light: #f0f2f8;
  --text: #181b2e;
  --text2: #555a72;
  --text3: #9094ae;
  --blue: #5b4df5;
  --blue-light: #7c6ff8;
  --purple: #8b5cf6;
  --orange: #f97316;
  --grad: linear-gradient(135deg, #5b4df5, #8b5cf6);
  --grad-soft: linear-gradient(135deg, rgba(91,77,245,0.04), rgba(139,92,246,0.04));
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 2px 20px rgba(0,0,0,0.05);
  --shadow-lg: 0 12px 44px rgba(0,0,0,0.08);
  --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}

/* Nav */
.nav-bar{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  background:rgba(255,255,255,0.9);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid var(--border);
}
.nav-inner{
  max-width:1240px;margin:0 auto;padding:0 32px;height:62px;
  display:flex;align-items:center;justify-content:space-between;
}
.nav-brand{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:800;letter-spacing:-0.3px}
.nav-brand .brand-icon{
  width:30px;height:30px;background:var(--grad);border-radius:8px;
  display:grid;place-items:center;font-size:15px;color:#fff
}
.nav-brand .accent{color:var(--blue)}
.nav-menu{display:flex;align-items:center;gap:4px}
.nav-menu a{padding:8px 16px;border-radius:8px;font-size:13px;font-weight:500;color:var(--text2);transition:all var(--trans)}
.nav-menu a:hover{color:var(--text);background:var(--bg2)}
.nav-menu a.btn-nav{background:var(--grad);color:#fff;font-weight:600;border-radius:8px;padding:9px 20px;box-shadow:0 4px 14px rgba(91,77,245,0.28)}
.nav-menu a.btn-nav:hover{transform:translateY(-1px);box-shadow:0 6px 22px rgba(91,77,245,0.38)}
.nav-toggle{display:none;background:none;border:none;color:var(--text);font-size:24px;cursor:pointer}

/* Hero */
.hero{
  padding:138px 0 76px;position:relative;overflow:hidden;
  background:
    radial-gradient(ellipse 75% 55% at 25% 18%,rgba(91,77,245,0.04) 0%,transparent 55%),
    radial-gradient(ellipse 45% 40% at 80% 72%,rgba(249,115,22,0.02) 0%,transparent 50%);
}
.hero-grid{
  max-width:1240px;margin:0 auto;padding:0 32px;
  display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center;
  position:relative;z-index:1
}
.hero-text .tag{
  display:inline-flex;align-items:center;gap:8px;
  padding:5px 14px;border-radius:6px;
  background:rgba(91,77,245,0.06);border:1px solid rgba(91,77,245,0.1);
  color:var(--blue);font-size:12px;font-weight:700;margin-bottom:24px
}
.hero-text h1{font-size:clamp(34px,5vw,52px);font-weight:900;line-height:1.06;letter-spacing:-1px;margin-bottom:18px}
.hero-text h1 .hl{background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-text .desc{font-size:15px;color:var(--text3);line-height:1.8;margin-bottom:32px;max-width:460px}
.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:13px 26px;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer;transition:all var(--trans);border:none;white-space:nowrap}
.btn-fill{background:var(--grad);color:#fff;box-shadow:0 6px 22px rgba(91,77,245,0.28)}
.btn-fill:hover{transform:translateY(-2px);box-shadow:0 12px 34px rgba(91,77,245,0.38)}
.btn-line{background:var(--bg);color:var(--text);border:1px solid var(--border)}
.btn-line:hover{border-color:var(--blue);color:var(--blue)}
.btn-muted{background:var(--bg2);color:var(--text);border:1px solid var(--border)}
.btn-muted:hover{background:var(--bg3)}

/* Browser window mockup */
.br-visual{position:relative}
.br-window{
  background:#fff;border:1px solid var(--border);
  border-radius:12px;overflow:hidden;box-shadow:var(--shadow-lg)
}
.br-topbar{
  padding:10px 14px;background:var(--bg2);border-bottom:1px solid var(--border);
  display:flex;align-items:center;gap:7px
}
.br-dot{width:9px;height:9px;border-radius:50%}
.br-dot.r{background:#ff5f56}.br-dot.y{background:#ffbd2e}.br-dot.g{background:#27c93f}
.br-url{
  flex:1;margin:0 10px;padding:6px 12px;background:#fff;border:1px solid var(--border);
  border-radius:6px;font-size:11px;color:var(--text3);display:flex;align-items:center;gap:6px
}
.br-url .br-lock{font-size:10px;color:#22c55e}
.br-content{padding:24px 20px}
.br-tab-row{display:flex;gap:2px;margin-bottom:18px;background:var(--bg2);border-radius:8px;padding:3px}
.br-tab{
  padding:7px 16px;border-radius:6px;font-size:11px;color:var(--text3);font-weight:500;cursor:pointer
}
.br-tab.active{background:#fff;color:var(--text);font-weight:600;box-shadow:0 1px 3px rgba(0,0,0,0.06)}
.br-card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.br-card{padding:16px 12px;border-radius:10px;text-align:center}
.br-card:nth-child(1){background:linear-gradient(135deg,#eef0ff,#e2e4ff)}
.br-card:nth-child(2){background:linear-gradient(135deg,#fff4ee,#ffe4d2)}
.br-card:nth-child(3){background:linear-gradient(135deg,#eefaf2,#d8f5e4)}
.br-card .bri{font-size:22px;margin-bottom:4px;display:block}
.br-card .brt{font-size:10px;font-weight:600}
.br-badge{
  position:absolute;bottom:-16px;right:-10px;
  background:#fff;border:1px solid var(--border);
  border-radius:10px;padding:12px 18px;box-shadow:var(--shadow);
  display:flex;align-items:center;gap:8px
}
.br-badge strong{font-size:12px;color:var(--blue)}

/* Highlight strip */
.hl-strip{max-width:1240px;margin:0 auto;padding:0 32px 68px;position:relative;z-index:1}
.hl-inner{
  background:var(--grad-soft);border:1px solid var(--border);
  border-radius:var(--radius);padding:26px 40px;
  display:flex;align-items:center;justify-content:center;gap:44px;flex-wrap:wrap
}
.hl-inner .hi{text-align:center}
.hi .hin{font-size:28px;font-weight:900;color:var(--blue)}
.hi .hil{font-size:11px;color:var(--text3);margin-top:4px}

/* Sections */
.sec{max-width:1240px;margin:0 auto;padding:76px 32px}
.sec-head{text-align:center;margin-bottom:52px}
.sec-head .label{
  display:inline-block;padding:4px 14px;border-radius:6px;
  background:rgba(91,77,245,0.05);border:1px solid rgba(91,77,245,0.1);
  color:var(--blue);font-size:12px;font-weight:700;letter-spacing:0.8px;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:15px;max-width:520px;margin:0 auto}

/* Features */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.feat-card{
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);padding:30px 24px;
  transition:all var(--trans);display:flex;gap:16px;align-items:flex-start
}
.feat-card:hover{border-color:var(--blue);box-shadow:var(--shadow);transform:translateY(-2px)}
.feat-card .fc-icon{
  width:44px;height:44px;border-radius:10px;display:grid;place-items:center;
  font-size:20px;flex-shrink:0
}
.feat-card .fci-1{background:rgba(91,77,245,0.07)}
.feat-card .fci-2{background:rgba(249,115,22,0.07)}
.feat-card .fci-3{background:rgba(34,197,94,0.07)}
.feat-card .fc-body h3{font-size:15px;font-weight:700;margin-bottom:6px}
.feat-card .fc-body p{font-size:12px;color:var(--text3);line-height:1.7}

/* Scene area */
.dark-zone{background:var(--bg2);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.scene-row{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.scene-card{
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);padding:28px 20px;text-align:center;
  transition:all var(--trans)
}
.scene-card:hover{border-color:#d4d6e8;transform:translateY(-2px);box-shadow:var(--shadow)}
.scene-card .si{font-size:32px;margin-bottom:10px;display:block}
.scene-card h3{font-size:15px;font-weight:700;margin-bottom:4px}
.scene-card p{font-size:11px;color:var(--text3);line-height:1.6}

/* VS */
.vs-wrap{max-width:780px;margin:0 auto;display:grid;grid-template-columns:1fr 1fr;gap:26px}
.vs-card{
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);padding:32px 28px;text-align:center
}
.vs-card.featured{border:2px solid var(--blue);box-shadow:0 0 0 6px rgba(91,77,245,0.04)}
.vs-card .vs-badge{display:inline-block;padding:3px 12px;border-radius:4px;font-size:11px;font-weight:700;margin-bottom:16px}
.vs-badge.grey{background:var(--bg2);color:var(--text3)}
.vs-badge.accent{background:rgba(91,77,245,0.08);color:var(--blue)}
.vs-card h3{font-size:18px;font-weight:700;margin-bottom:12px}
.vs-card ul{list-style:none;text-align:left;font-size:12px;color:var(--text2)}
.vs-card ul li{padding:7px 0;border-bottom:1px solid var(--border-light)}
.vs-card ul li:last-child{border-bottom:none}
.vs-card ul li::before{content:"✓ ";color:var(--blue);font-weight:700}

/* 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:13px;color:var(--text3);line-height:1.8;display:none}
.faq-item.open .faq-a{display:block}
.faq-item.open .arrow{transform:rotate(180deg)}

/* CTA */
.cta-box{
  background:var(--grad-soft);border:1px solid var(--border);
  border-radius:var(--radius);padding:60px 48px;text-align:center
}
.cta-box h2{font-size:clamp(28px,4vw,36px);font-weight:800;margin-bottom:12px}
.cta-box p{color:var(--text3);font-size:15px;margin-bottom:28px}
.cta-box .cta-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* 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:16px;font-weight:800;margin-bottom:12px}
.footer-brand .fl .ficon{width:26px;height:26px;background:var(--grad);border-radius:7px;display:grid;place-items:center;color:#fff;font-size:13px}
.footer-brand .fl .fc{color:var(--blue)}
.footer-brand p{font-size:12px;color:var(--text3);line-height:1.7;max-width:250px}
.footer-col h4{font-size:13px;font-weight:700;margin-bottom:16px}
.footer-col a{display:block;font-size:12px;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:128px 0 56px;text-align:center;background:radial-gradient(ellipse 60% 50% at 50% 30%,rgba(91,77,245,0.03) 0%,transparent 55%)}
.dl-hero-inner{max-width:760px;margin:0 auto;padding:0 32px}
.dl-hero-inner h1{font-size:clamp(30px,5vw,44px);font-weight:900;margin-bottom:12px}
.dl-hero-inner .dl-sub{color:var(--text3);font-size:14px;margin-bottom:18px}
.dl-meta{display:inline-flex;gap:18px;font-size:12px;color:var(--text2);flex-wrap:wrap}
.dl-grid{max-width:1240px;margin:0 auto 56px;padding:0 32px;display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.dl-card{
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);padding:32px 26px;text-align:center;
  transition:all var(--trans);display:flex;flex-direction:column;gap:14px
}
.dl-card:hover{border-color:var(--blue);transform:translateY(-2px);box-shadow:var(--shadow)}
.dl-card .dl-tag{display:inline-block;padding:3px 12px;border-radius:6px;font-size:11px;font-weight:700;background:rgba(91,77,245,0.06);color:var(--blue);align-self:center}
.dl-card h3{font-size:18px;font-weight:700}
.dl-card .dl-info{font-size:12px;color:var(--text3);line-height:1.6}
.dl-card .dl-size{font-size:11px;color:var(--text3)}
.dl-tips{max-width:1240px;margin:0 auto 56px;padding:0 32px;display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.dl-tips .tp{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-sm);padding:22px 18px;display:flex;gap:14px;align-items:flex-start}
.tp .tp-num{width:28px;height:28px;border-radius:6px;background:rgba(91,77,245,0.06);color:var(--blue);display:grid;place-items:center;font-size:13px;font-weight:800;flex-shrink:0}
.tp strong{display:block;font-size:13px;margin-bottom:4px}
.tp p{font-size:11px;color:var(--text3);line-height:1.6}

.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:150px 1fr;border-bottom:1px solid var(--border)}
.specs-tbl .sr:last-child{border-bottom:none}
.specs-tbl .sl{padding:14px 18px;background:var(--bg2);font-size:12px;font-weight:700;color:var(--blue)}
.specs-tbl .sv{padding:14px 18px;font-size:12px;color:var(--text2)}

/* 404 */
.err-wrap{min-height:100vh;display:grid;place-items:center;padding:32px;background:var(--bg)}
.err-card{
  max-width:480px;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:20px;font-weight:700;margin-bottom:12px}
.err-card p{color:var(--text3);font-size:13px;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)}
  .scene-row{grid-template-columns:repeat(2,1fr)}
  .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:62px;left:0;right:0;background:#fff;border-bottom:1px solid var(--border);padding:12px 24px;gap:4px;z-index:99}
  .hero{padding:116px 0 48px}
  .feat-grid,.scene-row{grid-template-columns:1fr}
  .vs-wrap{grid-template-columns:1fr}
  .dl-grid,.dl-tips{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .sec{padding:50px 20px}
  .cta-box{padding:44px 24px}
}