*{box-sizing:border-box}
:root{
  --blue:#2980FE;
  --blue-dark:#1768E8;
  --ink:#1f2937;
  --muted:#667085;
  --light:#f5f7fb;
  --line:#e6eaf2;
  --card:#ffffff;
  --gradient:linear-gradient(90deg,#3558F2 0%,#7B4EF1 50%,#B84DDA 100%);
  --shadow:0 18px 45px rgba(34,52,112,.12);
  --radius:28px;
}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC",Arial,sans-serif;
  color:var(--ink);
  background:#f8fafc;
  line-height:1.7;
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
.container{width:min(1120px,calc(100% - 36px));margin:0 auto}
.site-header{
  position:sticky;
  top:0;
  z-index:20;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(14px);
  border-bottom:1px solid rgba(230,234,242,.9);
}
.nav-wrap{
  width:min(1180px,calc(100% - 28px));
  margin:0 auto;
  min-height:68px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;color:#172033}
.brand img{width:38px;height:38px;border-radius:12px;object-fit:cover}
.site-nav{
  display:none;
  width:100%;
  position:absolute;
  top:68px;
  left:0;
  padding:12px 18px 18px;
  background:#fff;
  border-bottom:1px solid var(--line);
  box-shadow:0 18px 30px rgba(28,38,68,.08);
}
.site-nav.is-open{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.site-nav a{
  padding:10px 12px;
  border-radius:14px;
  color:#4b5563;
  font-weight:650;
  font-size:14px;
  background:#f8fafc;
}
.site-nav a:hover{color:var(--blue);background:#eef5ff}
.nav-toggle{
  display:inline-flex;
  flex-direction:column;
  gap:5px;
  width:42px;
  height:42px;
  align-items:center;
  justify-content:center;
  border:1px solid var(--line);
  border-radius:14px;
  background:#fff;
}
.nav-toggle span{width:18px;height:2px;background:#24324b;border-radius:99px}
.download-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:48px;
  padding:0 26px;
  border-radius:999px;
  background:var(--blue);
  color:#fff;
  font-weight:800;
  box-shadow:0 14px 26px rgba(41,128,254,.25);
  transition:.2s ease;
}
.download-btn:hover{background:var(--blue-dark);transform:translateY(-1px)}
.badge{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:7px 12px;
  border-radius:999px;
  background:#eef5ff;
  color:var(--blue);
  font-weight:750;
  font-size:13px;
}
.section{padding:64px 0}
.section-head{margin-bottom:24px}
.section-head h2,.split h2,.panel-title{font-size:30px;line-height:1.2;margin:10px 0;color:#101828}
.section-head p,.split p,.page-lead{color:var(--muted);margin:0}
.network-manager-hero{
  width:min(1180px,calc(100% - 28px));
  margin:24px auto 0;
  padding:28px;
  border-radius:34px;
  background:var(--gradient);
  color:#fff;
  position:relative;
  overflow:hidden;
}
.network-manager-hero:before{
  content:"";
  position:absolute;
  inset:-30% -10% auto auto;
  width:420px;
  height:420px;
  background:rgba(255,255,255,.18);
  border-radius:50%;
  filter:blur(4px);
}
.hero-grid{position:relative;display:grid;gap:30px;align-items:center}
.hero-copy h1{font-size:38px;line-height:1.12;margin:14px 0}
.hero-copy p{font-size:17px;color:rgba(255,255,255,.88);margin:0 0 22px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
.hero-tags span,.float-card{
  display:inline-flex;
  border:1px solid rgba(255,255,255,.28);
  background:rgba(255,255,255,.16);
  color:#fff;
  border-radius:999px;
  padding:8px 12px;
  font-size:13px;
  font-weight:700;
  backdrop-filter:blur(12px);
}
.hero-visual{
  position:relative;
  min-height:320px;
  display:flex;
  align-items:center;
  justify-content:center;
}
.hero-visual img{
  max-height:420px;
  object-fit:contain;
  filter:drop-shadow(0 24px 40px rgba(10,20,70,.24));
}
.float-card{position:absolute;background:rgba(255,255,255,.92);color:#263148;border-color:rgba(255,255,255,.6);box-shadow:0 15px 35px rgba(16,24,40,.12)}
.float-one{left:2%;top:12%}.float-two{right:0;top:26%}.float-three{left:6%;bottom:18%}.float-four{right:4%;bottom:8%}
.daily-scenes,.risk-grid,.faq-grid,.card-grid{display:grid;gap:16px}
.scene-card,.bento-card,.risk-card,.faq-item,.info-card,.step-card,.side-card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:24px;
  padding:22px;
  box-shadow:0 12px 26px rgba(31,41,55,.05);
}
.scene-card strong,.bento-card strong,.risk-card strong,.info-card strong{display:block;font-size:18px;margin:8px 0;color:#111827}
.scene-card p,.bento-card p,.risk-card p,.info-card p,.step-card p{color:var(--muted);margin:0 0 12px}
.text-link{color:var(--blue);font-weight:800}
.bento-feature-center{
  display:grid;
  grid-template-columns:1fr;
  gap:16px;
}
.bento-card{min-height:180px;position:relative;overflow:hidden}
.bento-card:after{
  content:"";
  position:absolute;
  right:-40px;
  bottom:-50px;
  width:130px;
  height:130px;
  border-radius:38px;
  background:linear-gradient(135deg,rgba(41,128,254,.14),rgba(123,78,241,.12));
  transform:rotate(18deg);
}
.bento-large{min-height:230px}
.feature-split,.smart-route-section,.safe-browsing-section,.multi-device-section,.account-security-section{
  display:grid;
  gap:24px;
  align-items:center;
}
.image-panel,.white-panel,.safety-panel{
  background:#fff;
  border:1px solid var(--line);
  border-radius:32px;
  padding:22px;
  box-shadow:var(--shadow);
}
.image-panel img{margin:auto;max-height:430px;object-fit:contain}
.point-list{display:grid;gap:10px;margin:18px 0}
.point-list span{
  display:flex;
  gap:10px;
  align-items:flex-start;
  padding:12px 14px;
  background:#f6f9ff;
  border:1px solid #e4efff;
  border-radius:16px;
  color:#445066;
}
.point-list span:before{content:"";width:8px;height:8px;border-radius:50%;background:var(--blue);margin-top:9px;flex:0 0 auto}
.gradient-band{
  background:linear-gradient(135deg,#f4f7ff,#fbf7ff);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.public-wifi-section,.privacy-guard-section,.network-diagnosis-section{
  background:#fff;
  border:1px solid var(--line);
  border-radius:34px;
  padding:24px;
  box-shadow:var(--shadow);
}
.three-grid,.two-grid{display:grid;gap:16px}
.process-steps{display:grid;gap:14px}
.step-card{position:relative;padding-left:72px}
.step-num{
  position:absolute;
  left:20px;
  top:22px;
  width:38px;
  height:38px;
  border-radius:14px;
  display:grid;
  place-items:center;
  color:#fff;
  background:var(--gradient);
  font-weight:900;
}
.risk-card{border-left:4px solid var(--blue)}
.page-hero{
  width:min(980px,calc(100% - 36px));
  margin:28px auto 0;
  padding:34px 0 18px;
}
.page-hero h1{font-size:36px;line-height:1.18;margin:14px 0 12px;color:#101828}
.page-layout{display:grid;gap:22px;width:min(1060px,calc(100% - 36px));margin:0 auto 64px}
.article-panel{
  background:#fff;
  border:1px solid var(--line);
  border-radius:30px;
  padding:24px;
  box-shadow:0 18px 34px rgba(31,41,55,.06);
}
.article-panel h2{font-size:24px;margin:0 0 12px}
.article-panel p{color:#4b5563}
.tip-box{
  margin:18px 0;
  padding:18px;
  border-radius:22px;
  background:#f6f9ff;
  border:1px solid #dfeaff;
}
.check-list{display:grid;gap:10px;padding:0;margin:16px 0;list-style:none}
.check-list li{padding:12px 14px;border:1px solid var(--line);border-radius:16px;background:#fbfcff;color:#49566b}
.cta-section{
  width:min(1060px,calc(100% - 36px));
  margin:0 auto 70px;
  padding:34px 24px;
  text-align:center;
  border-radius:34px;
  color:#fff;
  background:var(--gradient);
}
.cta-section p{color:rgba(255,255,255,.88);max-width:680px;margin:0 auto 22px}
.cta-section .download-btn{background:#2980FE}
.cta-section .download-btn:hover{background:#1768E8}
.download-steps{counter-reset:item;display:grid;gap:14px;margin:24px 0}
.download-steps div{
  counter-increment:item;
  border:1px solid var(--line);
  background:#fff;
  border-radius:20px;
  padding:16px 16px 16px 58px;
  position:relative;
}
.download-steps div:before{
  content:counter(item);
  position:absolute;
  left:16px;
  top:16px;
  width:30px;
  height:30px;
  display:grid;
  place-items:center;
  background:var(--blue);
  color:#fff;
  border-radius:12px;
  font-weight:900;
}
.site-footer{background:#101828;color:#d0d5dd;padding:44px 0 22px}
.footer-grid{display:grid;gap:28px}
.footer-brand{font-size:22px;font-weight:900;color:#fff;margin-bottom:10px}
.site-footer h3{color:#fff;margin:0 0 10px}
.site-footer a{display:block;color:#d0d5dd;margin:8px 0}
.site-footer a:hover{color:#fff}
.footer-bottom{width:min(1120px,calc(100% - 36px));margin:28px auto 0;padding-top:18px;border-top:1px solid rgba(255,255,255,.14);font-size:13px;color:#98a2b3}
@media (min-width:700px){
  .daily-scenes{grid-template-columns:repeat(2,1fr)}
  .three-grid{grid-template-columns:repeat(3,1fr)}
  .two-grid,.risk-grid,.faq-grid,.card-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr}
}
@media (min-width:980px){
  .nav-toggle{display:none}
  .site-nav{
    position:static;
    display:flex;
    width:auto;
    padding:0;
    background:transparent;
    border:0;
    box-shadow:none;
    gap:4px;
    align-items:center;
  }
  .site-nav a{background:transparent}
  .hero-grid{grid-template-columns:1.05fr .95fr}
  .hero-copy h1{font-size:56px}
  .daily-scenes{grid-template-columns:repeat(3,1fr)}
  .bento-feature-center{grid-template-columns:repeat(6,1fr);grid-auto-rows:minmax(170px,auto)}
  .bento-card{grid-column:span 2}
  .bento-large{grid-column:span 3;grid-row:span 2}
  .feature-split,.safe-browsing-section,.smart-route-section,.multi-device-section,.account-security-section{grid-template-columns:1fr 1fr}
  .page-layout{grid-template-columns:minmax(0,1fr) 300px;align-items:start}
  .side-card{position:sticky;top:92px}
  .process-steps{grid-template-columns:repeat(3,1fr)}
  .section{padding:82px 0}
}
@media (max-width:420px){
  .container,.page-layout,.page-hero,.cta-section{width:min(100% - 24px,1120px)}
  .network-manager-hero{width:calc(100% - 20px);padding:22px;border-radius:26px}
  .hero-copy h1,.page-hero h1{font-size:31px}
  .section-head h2,.split h2,.panel-title{font-size:25px}
  .float-card{position:static;margin:8px 6px 0 0}
  .hero-visual{display:block;min-height:auto}
}