:root{
    --primary:#2980FE;
    --primary-dark:#1768E8;
    --gradient:linear-gradient(90deg,#3558F2 0%,#7B4EF1 50%,#B84DDA 100%);
    --text:#1f2937;
    --muted:#667085;
    --light:#f6f8fc;
    --line:#e6ebf2;
    --card:#ffffff;
    --shadow:0 18px 48px rgba(45,67,112,.12);
    --radius:28px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",Arial,sans-serif;color:var(--text);background:#fff;line-height:1.75;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
.container{width:min(1120px,calc(100% - 32px));margin:0 auto}
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.9);backdrop-filter:blur(14px);border-bottom:1px solid rgba(230,235,242,.85)}
.header-inner{height:68px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;color:#111827;white-space:nowrap}
.logo img{width:38px;height:38px;border-radius:12px;object-fit:cover}
.nav-toggle{display:none}
.nav-toggle-label{width:42px;height:42px;border:1px solid var(--line);border-radius:14px;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:5px;background:#fff}
.nav-toggle-label span{width:18px;height:2px;background:#243044;border-radius:2px}
.site-nav{position:absolute;left:16px;right:16px;top:76px;display:none;grid-template-columns:1fr;gap:8px;padding:14px;background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow)}
.site-nav a{padding:10px 12px;border-radius:12px;color:#344054;font-size:15px}
.site-nav a:hover{background:#f0f5ff;color:var(--primary)}
.nav-toggle:checked~.site-nav{display:grid}
.download-btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:12px 24px;border-radius:999px;background:var(--primary);color:#fff!important;font-weight:800;box-shadow:0 12px 26px rgba(41,128,254,.26);transition:.2s ease;border:none}
.download-btn:hover{background:var(--primary-dark);transform:translateY(-1px)}
.badge{display:inline-flex;align-items:center;padding:6px 12px;border-radius:999px;background:#ecf4ff;color:var(--primary);font-size:13px;font-weight:800}
.section{padding:64px 0}
.section.alt{background:var(--light)}
.section-head{max-width:760px;margin:0 auto 28px;text-align:center}
.section-head h2{margin:0 0 12px;font-size:30px;line-height:1.25;color:#111827}
.section-head p{margin:0;color:var(--muted)}
.network-manager-hero{padding:42px 0 56px;background:radial-gradient(circle at 75% 20%,rgba(255,255,255,.38),transparent 28%),var(--gradient);color:#fff;position:relative;overflow:hidden}
.network-manager-hero:after{content:"";position:absolute;left:-8%;right:-8%;bottom:-70px;height:150px;background:#fff;border-radius:50% 50% 0 0/70% 70% 0 0}
.hero-grid{position:relative;z-index:1;display:grid;gap:28px;align-items:center}
.hero-copy h1{font-size:38px;line-height:1.18;margin:12px 0 16px;letter-spacing:-.03em}
.hero-copy p{font-size:16px;color:rgba(255,255,255,.88);margin:0 0 22px;max-width:620px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.hero-tags span,.status-pill{padding:8px 12px;border-radius:999px;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.24);color:#fff;font-size:13px}
.hero-device{position:relative;min-height:300px;display:flex;align-items:center;justify-content:center}
.hero-card{width:min(420px,100%);padding:22px;border-radius:34px;background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.24);box-shadow:0 24px 70px rgba(31,41,55,.22)}
.hero-card img{width:100%;border-radius:26px;background:#fff}
.float-card{position:absolute;background:#fff;color:#1f2937;border-radius:18px;padding:10px 14px;box-shadow:0 14px 34px rgba(20,32,58,.16);font-weight:800;font-size:13px}
.float-card.one{top:14px;left:0}.float-card.two{top:72px;right:0}.float-card.three{bottom:70px;left:8px}.float-card.four{bottom:10px;right:18px}
.daily-scenes{display:grid;gap:16px}
.scene-card,.feature-card,.info-card,.risk-card,.faq-item,.tip-box,.article-card{background:var(--card);border:1px solid var(--line);border-radius:24px;padding:22px;box-shadow:0 12px 32px rgba(45,67,112,.06)}
.scene-card strong,.feature-card strong{display:block;color:var(--primary);font-size:13px;margin-bottom:8px}
.scene-card h3,.feature-card h3,.info-card h3,.risk-card h3{margin:0 0 8px;font-size:20px;line-height:1.35;color:#111827}
.scene-card p,.feature-card p,.info-card p,.risk-card p{margin:0;color:var(--muted)}
.link-more{display:inline-flex;margin-top:14px;color:var(--primary);font-weight:800}
.bento-feature-center{display:grid;gap:16px}
.feature-card.large{background:linear-gradient(135deg,#ffffff,#f4f7ff)}
.split-section{display:grid;gap:24px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:34px;padding:22px;box-shadow:var(--shadow)}
.split-section.reverse .split-media{order:-1}
.split-copy h2{margin:8px 0 12px;font-size:28px;line-height:1.28;color:#111827}
.split-copy p{margin:0 0 16px;color:var(--muted)}
.check-list{display:grid;gap:10px;margin:18px 0;padding:0;list-style:none}
.check-list li{position:relative;padding-left:28px;color:#344054}
.check-list li:before{content:"";position:absolute;left:0;top:.55em;width:14px;height:14px;border-radius:50%;background:var(--primary);box-shadow:inset 0 0 0 4px #dbeafe}
.split-media{border-radius:28px;background:#f3f6fb;padding:16px;overflow:hidden}
.split-media img{border-radius:22px;margin:auto}
.public-wifi-section,.privacy-guard-section,.network-diagnosis-section,.account-security-section{background:#fff;border:1px solid var(--line);border-radius:34px;padding:24px;box-shadow:var(--shadow)}
.panel-grid{display:grid;gap:16px;margin-top:20px}
.safety-panel{background:linear-gradient(135deg,#f7fbff,#fff);border:1px solid var(--line);border-radius:26px;padding:20px}
.process-steps{display:grid;gap:14px;counter-reset:step}
.step-card{background:#fff;border:1px solid var(--line);border-radius:24px;padding:20px;position:relative;box-shadow:0 12px 28px rgba(45,67,112,.06)}
.step-num{width:36px;height:36px;border-radius:14px;background:var(--primary);color:#fff;display:grid;place-items:center;font-weight:900;margin-bottom:12px}
.step-card h3{margin:0 0 8px;font-size:18px}.step-card p{margin:0;color:var(--muted)}
.risk-grid{display:grid;gap:14px}
.risk-card{border-left:4px solid var(--primary)}
.risk-card small{display:block;margin-top:10px;color:#475467}
.faq-list{display:grid;gap:14px;max-width:860px;margin:0 auto}
.faq-item h3{margin:0 0 8px;font-size:18px}.faq-item p{margin:0;color:var(--muted)}
.cta-section{padding:58px 0;background:var(--gradient);color:#fff;text-align:center}
.cta-section h2{font-size:30px;margin:0 0 12px}.cta-section p{margin:0 auto 22px;max-width:720px;color:rgba(255,255,255,.88)}
.page-hero{padding:46px 0;background:linear-gradient(180deg,#f8fbff,#fff)}
.page-hero-inner{max-width:860px}.page-hero h1{font-size:34px;line-height:1.25;margin:14px 0 12px;color:#111827}.page-hero p{margin:0;color:var(--muted)}
.article-layout{display:grid;gap:24px;align-items:start}.article-main{display:grid;gap:18px}.article-main p{margin:0;color:#445066}.article-main h2{margin:10px 0 0;font-size:24px;color:#111827}
.side-panel{background:#f7f9fd;border:1px solid var(--line);border-radius:26px;padding:20px}.side-panel h3{margin:0 0 10px}.side-panel a{display:block;color:var(--primary);font-weight:800;padding:6px 0}
.action-row{margin-top:10px}.only-download{margin-top:20px}
.download-steps{display:grid;gap:14px}.download-steps .step-card{box-shadow:none}
.site-footer{background:#111827;color:#d0d5dd;padding:42px 0 18px}.footer-grid{display:grid;gap:24px}.footer-brand{font-size:20px;font-weight:900;color:#fff;margin-bottom:10px}.site-footer p{margin:0;color:#b7c0cc}.site-footer h3{margin:0 0 10px;color:#fff;font-size:16px}.site-footer a{display:block;color:#d0d5dd;padding:5px 0}.site-footer a:hover{color:#fff}.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:26px;padding-top:16px;display:flex;flex-direction:column;gap:8px;font-size:13px;color:#aeb8c6}
@media (min-width:720px){
    .daily-scenes{grid-template-columns:repeat(2,1fr)}
    .bento-feature-center{grid-template-columns:repeat(2,1fr)}
    .panel-grid{grid-template-columns:repeat(3,1fr)}
    .risk-grid{grid-template-columns:repeat(2,1fr)}
    .process-steps{grid-template-columns:repeat(2,1fr)}
    .footer-grid{grid-template-columns:1.5fr 1fr 1fr}.footer-bottom{flex-direction:row;justify-content:space-between}
}
@media (min-width:960px){
    .nav-toggle-label{display:none}.site-nav{position:static;display:flex;align-items:center;gap:4px;padding:0;background:transparent;border:none;box-shadow:none}.site-nav a{font-size:14px}
    .network-manager-hero{padding:72px 0 96px}.hero-grid{grid-template-columns:1.05fr .95fr}.hero-copy h1{font-size:56px}.hero-copy p{font-size:18px}
    .section{padding:84px 0}.section-head h2{font-size:38px}
    .daily-scenes{grid-template-columns:repeat(3,1fr)}
    .bento-feature-center{grid-template-columns:repeat(4,1fr);grid-auto-rows:minmax(180px,auto)}
    .feature-card.large{grid-column:span 2;grid-row:span 2}.feature-card.wide{grid-column:span 2}
    .split-section{grid-template-columns:1fr 1fr;padding:34px}.split-section.reverse .split-media{order:2}
    .split-copy h2{font-size:36px}
    .public-wifi-section,.privacy-guard-section,.network-diagnosis-section,.account-security-section{padding:34px}
    .risk-grid{grid-template-columns:repeat(4,1fr)}
    .process-steps{grid-template-columns:repeat(3,1fr)}
    .article-layout{grid-template-columns:minmax(0,1fr) 300px}.side-panel{position:sticky;top:96px}
}