:root{
    --brand: rgb(213, 5, 5);
    --brand-dark: rgb(180, 4, 4);
    --brand-soft: rgba(213,5,5,.08);
    --text: #161616;
    --muted: #666;
    --light: #f6f6f6;
    --line: #e8e8e8;
    --white: #fff;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
    margin:0;
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","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%;display:block}
.container{width:min(1120px,92vw);margin:0 auto}
.site-header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
.desktop-topbar{display:none;background:var(--brand-dark);color:#fff;font-size:13px}
.topbar-inner{display:flex;justify-content:space-between;gap:20px;padding:7px 0;opacity:.96}
.mobile-header{
    height:62px;
    display:grid;
    grid-template-columns:80px 1fr 80px;
    align-items:center;
    padding:0 14px;
    background:#fff;
    border-bottom:3px solid var(--brand-dark);
}
.menu-toggle{
    width:42px;height:42px;border:0;background:#fff;display:flex;flex-direction:column;
    justify-content:center;gap:5px;padding:0;cursor:pointer;
}
.menu-toggle span{width:24px;height:2px;background:var(--brand-dark);border-radius:2px;margin-left:2px}
.mobile-logo{justify-self:center}
.mobile-logo img{height:36px;width:auto}
.top-action{
    display:inline-flex;align-items:center;justify-content:center;
    min-height:38px;padding:0 16px;border-radius:999px;
    background:var(--brand);color:#fff;font-weight:700;font-size:14px;
    box-shadow:0 8px 18px rgba(213,5,5,.18);
}
.desktop-nav-wrap{display:none;background:#fff}
.mobile-nav{
    display:none;background:#fff;border-bottom:1px solid var(--line);padding:8px 16px 14px;
    box-shadow:0 12px 30px rgba(0,0,0,.08);
}
.mobile-nav.open{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.mobile-nav a{padding:10px 12px;background:#f8f8f8;border-radius:12px;font-size:14px;color:#333}
.mobile-nav a.active{background:var(--brand-soft);color:var(--brand);font-weight:700}
.search-icon{width:22px;height:22px;border:2px solid #555;border-radius:50%;position:relative;display:inline-block;flex:0 0 auto}
.search-icon:after{content:"";position:absolute;width:9px;height:2px;background:#555;right:-7px;bottom:-3px;transform:rotate(45deg);border-radius:3px}
.section{padding:52px 0}
.section.alt{background:var(--light)}
.section-title{margin:0 0 10px;font-size:28px;line-height:1.28}
.section-lead{margin:0 0 26px;color:#555;max-width:760px}
.main-btn{
    display:inline-flex;align-items:center;justify-content:center;
    min-height:46px;padding:0 24px;border-radius:999px;background:var(--brand);
    color:#fff;font-weight:800;letter-spacing:.3px;box-shadow:0 12px 24px rgba(213,5,5,.2);
    transition:.2s ease;
}
.main-btn:hover{background:var(--brand-dark);transform:translateY(-1px)}
.link-more{color:var(--brand);font-weight:700;display:inline-flex;align-items:center;margin-top:10px}
.link-more:after{content:"›";margin-left:5px;font-size:20px;line-height:1}
.official-hero{
    background:linear-gradient(180deg,#fff 0%,#fff6f6 100%);
    padding:42px 0 30px;
}
.hero-grid{display:grid;gap:28px;align-items:center}
.eyebrow{
    display:inline-flex;background:var(--brand-soft);color:var(--brand);
    border:1px solid rgba(213,5,5,.14);border-radius:999px;
    padding:6px 14px;font-weight:700;font-size:14px;margin-bottom:16px
}
.hero-copy h1{font-size:34px;line-height:1.18;margin:0 0 16px}
.hero-copy p{color:#444;margin:0 0 22px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.hero-tags span{background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 12px;font-size:13px;color:#555}
.hero-visual{position:relative;border-radius:24px;overflow:hidden;background:#fff;box-shadow:0 18px 48px rgba(0,0,0,.12)}
.hero-visual img{width:100%;aspect-ratio:16/10;object-fit:cover}
.hero-badge{
    position:absolute;left:18px;bottom:18px;background:#fff;border-radius:16px;
    padding:12px 14px;box-shadow:0 10px 30px rgba(0,0,0,.15);max-width:260px
}
.hero-badge strong{display:block;color:var(--brand);font-size:18px}
.hero-badge span{font-size:13px;color:#555}
.category-main-grid{display:grid;gap:16px;margin-top:20px}
.category-sub-grid{display:grid;gap:12px;margin-top:14px}
.category-card{
    background:#fff;border:1px solid var(--line);border-radius:20px;padding:22px;
    box-shadow:0 10px 28px rgba(0,0,0,.05);position:relative;overflow:hidden;
}
.category-card:before{
    content:"";position:absolute;left:0;top:0;width:5px;height:100%;background:var(--brand);
}
.category-card h3{font-size:22px;margin:0 0 10px}
.category-card p{margin:0;color:#555}
.category-sub-card{
    background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;
}
.category-sub-card h3{font-size:18px;margin:0 0 8px}
.category-sub-card p{margin:0;color:#555;font-size:14px}
.focus-grid{display:grid;gap:16px}
.focus-card{
    background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;
    box-shadow:0 8px 22px rgba(0,0,0,.05)
}
.card-label{display:inline-flex;background:var(--brand);color:#fff;border-radius:999px;padding:4px 10px;font-size:12px;font-weight:700;margin-bottom:12px}
.focus-card h3{margin:0 0 8px;font-size:21px}
.focus-card p{margin:0;color:#555}
.info-split{display:grid;gap:18px;align-items:start}
.info-panel{
    background:#fff;border:1px solid var(--line);border-radius:22px;padding:22px;
    box-shadow:0 12px 28px rgba(0,0,0,.05)
}
.info-panel h3{font-size:24px;margin:0 0 16px}
.info-item{padding:14px 0;border-top:1px solid var(--line)}
.info-item:first-of-type{border-top:0}
.info-item h4{margin:0 0 6px;font-size:17px}
.info-item p{margin:0;color:#555}
.info-image{border-radius:18px;overflow:hidden;margin-top:18px}
.showcase,.app-showcase,.score-data{display:grid;gap:24px;align-items:center}
.showcase img,.app-showcase img,.score-image{border-radius:24px;box-shadow:0 16px 38px rgba(0,0,0,.1);background:#fff}
.point-list{display:grid;gap:10px;margin:18px 0 0;padding:0;list-style:none}
.point-list li{
    background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px 14px;
    display:flex;gap:10px;align-items:flex-start
}
.point-list li:before{content:"";width:8px;height:8px;background:var(--brand);border-radius:50%;margin-top:10px;flex:0 0 auto}
.data-cards{display:grid;gap:14px}
.data-card{
    background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px;
    box-shadow:0 8px 24px rgba(0,0,0,.05)
}
.data-card strong{display:block;color:var(--brand);font-size:21px;margin-bottom:5px}
.data-card p{margin:0;color:#555}
.security-grid,.quick-grid{display:grid;gap:14px}
.security-card,.quick-card{
    background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px;
    box-shadow:0 8px 20px rgba(0,0,0,.04)
}
.security-card h3,.quick-card h3{margin:0 0 8px;font-size:19px}
.security-card p,.quick-card p{margin:0;color:#555}
.responsible-box{
    background:#f7f7f7;border-left:6px solid var(--brand);border-radius:18px;padding:24px;
}
.responsible-box h2{margin:0 0 10px}
.responsible-box p{margin:0 0 10px;color:#444}
.faq-list{display:grid;gap:12px}
.faq-item{
    background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;
}
.faq-item h3{margin:0 0 8px;font-size:18px}
.faq-item p{margin:0;color:#555}
.cta-panel{
    background:linear-gradient(135deg,rgba(213,5,5,.1),#fff);
    border:1px solid rgba(213,5,5,.16);border-radius:24px;padding:28px;text-align:center
}
.cta-panel h2{margin:0 0 10px}
.cta-panel p{margin:0 auto 18px;color:#555;max-width:760px}
.page-hero{
    background:linear-gradient(180deg,#fff,#fff7f7);
    padding:44px 0 32px;border-bottom:1px solid var(--line)
}
.page-hero h1{margin:0 0 12px;font-size:32px;line-height:1.2}
.page-hero p{margin:0;color:#555;max-width:820px}
.content-grid{display:grid;gap:18px}
.content-card{
    background:#fff;border:1px solid var(--line);border-radius:20px;padding:24px;
    box-shadow:0 8px 22px rgba(0,0,0,.04)
}
.content-card h2{margin:0 0 12px;font-size:23px}
.content-card p{margin:0 0 12px;color:#4c4c4c}
.content-card ul,.step-list{margin:12px 0 0;padding-left:20px;color:#4c4c4c}
.content-card li{margin:8px 0}
.related-links{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.related-links a{background:var(--brand-soft);color:var(--brand);border-radius:999px;padding:8px 13px;font-weight:700;font-size:14px}
.download-panel{
    background:#fff;border:1px solid var(--line);border-radius:24px;padding:26px;
    box-shadow:0 12px 34px rgba(0,0,0,.06);display:grid;gap:20px;align-items:center
}
.download-panel img{border-radius:22px}
.site-footer{background:#222;color:#eee;padding:42px 0 24px}
.footer-grid{display:grid;gap:24px}
.footer-logo{height:40px;width:auto;margin-bottom:12px}
.site-footer p{color:#cfcfcf;margin:0}
.site-footer h3{margin:0 0 10px;font-size:17px;color:#fff}
.site-footer a{display:block;color:#d8d8d8;margin:7px 0;font-size:14px}
.footer-note{margin-top:24px;border-top:1px solid rgba(255,255,255,.12);padding-top:18px;font-size:13px}
@media (min-width:640px){
    .category-main-grid{grid-template-columns:repeat(2,1fr)}
    .category-sub-grid,.security-grid,.quick-grid{grid-template-columns:repeat(2,1fr)}
    .focus-grid{grid-template-columns:repeat(2,1fr)}
    .data-cards{grid-template-columns:repeat(3,1fr)}
    .download-panel{grid-template-columns:1.1fr .9fr}
}
@media (min-width:900px){
    .mobile-header,.mobile-nav{display:none!important}
    .desktop-topbar{display:block}
    .desktop-nav-wrap{display:block}
    .desktop-nav{height:76px;display:flex;align-items:center;gap:24px}
    .brand-logo img{height:46px;width:auto}
    .main-nav{display:flex;align-items:center;gap:22px;flex:1;justify-content:center}
    .main-nav a{font-size:15px;color:#222;position:relative;padding:27px 0}
    .main-nav a.active,.main-nav a:hover{color:var(--brand);font-weight:700}
    .main-nav a.active:after{
        content:"";position:absolute;left:0;right:0;bottom:16px;height:3px;background:var(--brand);border-radius:4px
    }
    .official-hero{padding:62px 0 42px}
    .hero-grid{grid-template-columns:1fr 1.05fr}
    .hero-copy h1{font-size:48px}
    .section{padding:72px 0}
    .section-title{font-size:34px}
    .category-main-grid{grid-template-columns:repeat(4,1fr)}
    .category-card{min-height:250px}
    .category-sub-grid{grid-template-columns:repeat(4,1fr)}
    .info-split,.showcase,.app-showcase,.score-data{grid-template-columns:1fr 1fr}
    .security-grid{grid-template-columns:repeat(3,1fr)}
    .quick-grid{grid-template-columns:repeat(3,1fr)}
    .content-grid{grid-template-columns:repeat(2,1fr)}
    .footer-grid{grid-template-columns:1.5fr 1fr 1fr 1fr}
}
@media (max-width:420px){
    .mobile-header{grid-template-columns:58px 1fr 72px;padding:0 10px}
    .top-action{padding:0 13px;min-height:34px}
    .hero-copy h1{font-size:29px}
    .section-title{font-size:25px}
    .category-card,.content-card{padding:18px}
}