:root{
    --primary: rgb(70,139,223);
    --primary-dark:#226dbd;
    --primary-soft:#eaf4ff;
    --ink:#13243a;
    --muted:#607089;
    --line:#dbe8f7;
    --card:#ffffff;
    --bg:#f5f9ff;
    --shadow:0 18px 45px rgba(33,89,145,.10);
    --radius:22px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
    margin:0;
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;
    color:var(--ink);
    background:
        radial-gradient(circle at 15% 5%, rgba(70,139,223,.16), transparent 32%),
        linear-gradient(180deg,#f7fbff 0%,#eef6ff 42%,#ffffff 100%);
    line-height:1.72;
    overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{
    width:min(1120px, calc(100% - 32px));
    margin:0 auto;
}
.site-header{
    position:sticky;
    top:0;
    z-index:50;
    background:rgba(255,255,255,.86);
    backdrop-filter:blur(18px);
    border-bottom:1px solid rgba(219,232,247,.78);
}
.nav-wrap{
    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;
    letter-spacing:.2px;
}
.brand-logo{width:38px;height:38px;border-radius:12px}
.brand-text{font-size:18px}
.nav-toggle{display:none}
.nav-toggle-label{
    width:42px;
    height:42px;
    display:flex;
    flex-direction:column;
    justify-content:center;
    gap:5px;
    border:1px solid var(--line);
    border-radius:14px;
    padding:0 10px;
    background:#fff;
}
.nav-toggle-label span{
    height:2px;
    background:var(--ink);
    border-radius:3px;
}
.main-nav{
    position:absolute;
    top:68px;
    left:16px;
    right:16px;
    display:none;
    flex-direction:column;
    gap:4px;
    padding:12px;
    background:#fff;
    border:1px solid var(--line);
    border-radius:18px;
    box-shadow:var(--shadow);
}
.main-nav a{
    padding:11px 12px;
    border-radius:12px;
    color:var(--muted);
    font-weight:600;
}
.main-nav a:hover{background:var(--primary-soft);color:var(--primary-dark)}
.nav-toggle:checked ~ .main-nav{display:flex}
.hero{
    padding:54px 0 34px;
}
.hero-layout{
    display:grid;
    grid-template-columns:1fr;
    gap:28px;
    align-items:center;
}
.eyebrow,.badge{
    display:inline-flex;
    align-items:center;
    gap:8px;
    padding:7px 12px;
    border-radius:999px;
    background:rgba(70,139,223,.10);
    color:var(--primary-dark);
    font-size:13px;
    font-weight:700;
}
.hero h1,.page-hero h1{
    margin:16px 0 14px;
    font-size:clamp(32px, 9vw, 58px);
    line-height:1.08;
    letter-spacing:-1.4px;
}
.hero p,.page-hero p{
    color:var(--muted);
    font-size:17px;
    margin:0 0 22px;
}
.hero-actions{
    display:flex;
    align-items:center;
    flex-wrap:wrap;
    gap:14px;
}
.download-btn{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    min-height:48px;
    padding:13px 24px;
    border-radius:999px;
    background:linear-gradient(135deg,var(--primary),#2f7fda);
    color:#fff;
    font-weight:800;
    box-shadow:0 12px 28px rgba(70,139,223,.26);
    border:0;
    cursor:pointer;
    transition:transform .18s ease, box-shadow .18s ease;
}
.download-btn:hover{
    transform:translateY(-2px);
    box-shadow:0 16px 34px rgba(70,139,223,.32);
}
.text-link{font-weight:700;color:var(--primary-dark)}
.hero-visual{
    position:relative;
    min-height:480px;
    display:flex;
    align-items:center;
    justify-content:center;
    border-radius:34px;
    background:
        radial-gradient(circle at 80% 18%, rgba(70,139,223,.20), transparent 28%),
        linear-gradient(145deg, rgba(255,255,255,.86), rgba(235,246,255,.78));
    border:1px solid rgba(255,255,255,.9);
    box-shadow:var(--shadow);
    overflow:hidden;
}
.hero-visual:before{
    content:"";
    position:absolute;
    width:230px;
    height:230px;
    background:rgba(70,139,223,.12);
    border-radius:50%;
    left:-80px;
    bottom:-70px;
}
.phone-card{
    position:relative;
    width:min(245px,68vw);
    padding:16px;
    border-radius:32px;
    background:#fff;
    box-shadow:0 30px 80px rgba(26,77,130,.16);
    border:1px solid rgba(70,139,223,.12);
}
.status-card,.float-tag{
    position:absolute;
    z-index:2;
    background:rgba(255,255,255,.92);
    border:1px solid rgba(219,232,247,.95);
    box-shadow:0 12px 35px rgba(24,77,133,.10);
    backdrop-filter:blur(10px);
}
.status-card{
    left:16px;
    top:24px;
    width:175px;
    padding:14px;
    border-radius:18px;
}
.status-dot{
    width:9px;
    height:9px;
    border-radius:50%;
    display:inline-block;
    background:#21b985;
    margin-right:7px;
}
.status-card strong{display:block;font-size:14px}
.status-card span{display:block;color:var(--muted);font-size:12px;margin-top:3px}
.float-tag{
    padding:9px 12px;
    border-radius:999px;
    color:var(--primary-dark);
    font-size:12px;
    font-weight:800;
}
.tag-one{right:18px;top:84px}
.tag-two{left:24px;bottom:72px}
.tag-three{right:18px;bottom:26px}
.section{
    padding:44px 0;
}
.section-head{
    max-width:720px;
    margin-bottom:22px;
}
.section-head.center{text-align:center;margin-left:auto;margin-right:auto}
.section-kicker{
    color:var(--primary-dark);
    font-size:13px;
    font-weight:800;
    letter-spacing:.08em;
    text-transform:uppercase;
}
.section h2{
    margin:8px 0 10px;
    font-size:clamp(25px, 6vw, 38px);
    line-height:1.2;
    letter-spacing:-.7px;
}
.section p{color:var(--muted)}
.trust-grid,.category-grid,.feature-grid,.scenario-grid,.article-grid,.faq-grid{
    display:grid;
    grid-template-columns:1fr;
    gap:16px;
}
.trust-item,.category-card,.feature-card,.scenario-card,.article-card,.faq-item,.notice-card,.step-card,.download-panel,.security-card{
    background:rgba(255,255,255,.88);
    border:1px solid rgba(219,232,247,.95);
    border-radius:var(--radius);
    box-shadow:0 10px 30px rgba(31,86,143,.07);
}
.trust-item{
    padding:18px;
    display:flex;
    gap:14px;
    align-items:flex-start;
}
.icon{
    width:42px;
    height:42px;
    border-radius:14px;
    flex:0 0 auto;
    display:grid;
    place-items:center;
    background:var(--primary-soft);
    color:var(--primary-dark);
    font-weight:900;
}
.trust-item h3,.category-card h3,.feature-card h3,.scenario-card h3,.article-card h3,.notice-card h3,.security-card h3{
    margin:0 0 8px;
    font-size:18px;
}
.trust-item p,.category-card p,.feature-card p,.scenario-card p,.article-card p,.notice-card p,.security-card p{margin:0}
.category-card,.feature-card,.scenario-card,.article-card,.notice-card,.security-card{
    padding:22px;
}
.category-card{
    transition:transform .18s ease, border-color .18s ease;
}
.category-card:hover{
    transform:translateY(-3px);
    border-color:rgba(70,139,223,.35);
}
.category-card .card-link{
    display:inline-flex;
    margin-top:14px;
    color:var(--primary-dark);
    font-weight:800;
}
.split-layout,.security-layout{
    display:grid;
    grid-template-columns:1fr;
    gap:22px;
    align-items:center;
}
.product-panel{
    padding:24px;
    border-radius:28px;
    background:linear-gradient(145deg,#ffffff,#eef7ff);
    border:1px solid rgba(219,232,247,.9);
    box-shadow:var(--shadow);
}
.metric-row{
    display:grid;
    grid-template-columns:1fr;
    gap:12px;
    margin-top:18px;
}
.metric{
    padding:14px;
    border-radius:16px;
    background:#fff;
    border:1px solid var(--line);
}
.metric strong{display:block;font-size:22px;color:var(--primary-dark)}
.metric span{color:var(--muted);font-size:13px}
.security-stack{
    display:grid;
    gap:14px;
}
.security-card{
    position:relative;
    overflow:hidden;
}
.security-card:after{
    content:"";
    position:absolute;
    inset:auto -35px -55px auto;
    width:120px;
    height:120px;
    border-radius:50%;
    background:rgba(70,139,223,.08);
}
.steps{
    display:grid;
    grid-template-columns:1fr;
    gap:14px;
}
.step-card{
    padding:20px;
    position:relative;
}
.step-number{
    display:inline-grid;
    place-items:center;
    width:34px;
    height:34px;
    border-radius:12px;
    background:var(--primary);
    color:#fff;
    font-weight:900;
    margin-bottom:12px;
}
.step-card h3{margin:0 0 8px}
.step-card p{margin:0}
.cta-section{
    padding:54px 0 70px;
}
.download-panel{
    text-align:center;
    padding:34px 20px;
    background:
        radial-gradient(circle at 15% 20%, rgba(70,139,223,.16), transparent 34%),
        linear-gradient(135deg,#ffffff,#edf7ff);
}
.download-panel h2{margin:0 0 10px;font-size:clamp(26px, 7vw, 40px)}
.download-panel p{max-width:680px;margin:0 auto 22px;color:var(--muted)}
.page-hero{
    padding:48px 0 18px;
}
.page-hero-card{
    padding:28px;
    border-radius:30px;
    background:linear-gradient(145deg,rgba(255,255,255,.92),rgba(235,246,255,.88));
    border:1px solid rgba(219,232,247,.95);
    box-shadow:var(--shadow);
}
.content-wrap{
    display:grid;
    grid-template-columns:1fr;
    gap:18px;
    padding:28px 0 62px;
}
.article-card h2,.notice-card h2{margin-top:0}
.article-card ul,.notice-card ul,.feature-card ul{
    padding-left:20px;
    color:var(--muted);
}
.article-card li,.notice-card li,.feature-card li{margin:6px 0}
.article-card .download-btn{margin-top:10px}
.info-list{
    display:grid;
    gap:10px;
    margin-top:14px;
}
.info-row{
    padding:12px 14px;
    border-radius:14px;
    background:var(--primary-soft);
    color:#254d77;
    font-weight:700;
}
.faq-item{
    padding:20px;
}
.faq-item h3{
    margin:0 0 8px;
    font-size:17px;
}
.faq-item p{margin:0;color:var(--muted)}
.download-steps{
    counter-reset:step;
    display:grid;
    gap:12px;
}
.download-steps div{
    counter-increment:step;
    padding:16px;
    border-radius:18px;
    background:#fff;
    border:1px solid var(--line);
}
.download-steps div:before{
    content:counter(step);
    display:inline-grid;
    place-items:center;
    width:28px;
    height:28px;
    margin-right:8px;
    border-radius:10px;
    color:#fff;
    background:var(--primary);
    font-weight:900;
}
.site-footer{
    padding:42px 0 18px;
    background:#f0f7ff;
    border-top:1px solid var(--line);
}
.footer-grid{
    display:grid;
    grid-template-columns:1fr;
    gap:22px;
}
.footer-brand{
    display:flex;
    align-items:center;
    gap:10px;
    margin-bottom:10px;
}
.footer-logo{width:34px;height:34px;border-radius:10px}
.site-footer p{color:var(--muted);margin:0;max-width:520px}
.site-footer h3{font-size:16px;margin:0 0 10px}
.site-footer a{
    display:block;
    color:var(--muted);
    margin:7px 0;
}
.site-footer a:hover{color:var(--primary-dark)}
.footer-bottom{
    display:flex;
    flex-direction:column;
    gap:8px;
    padding-top:22px;
    margin-top:24px;
    border-top:1px solid rgba(219,232,247,.95);
    color:var(--muted);
    font-size:13px;
}
@media (min-width:680px){
    .trust-grid,.category-grid,.feature-grid,.scenario-grid,.article-grid,.faq-grid{
        grid-template-columns:repeat(2,1fr);
    }
    .metric-row{grid-template-columns:repeat(2,1fr)}
    .steps{grid-template-columns:repeat(2,1fr)}
    .download-panel{padding:46px 34px}
}
@media (min-width:920px){
    .container{width:min(1120px, calc(100% - 56px))}
    .nav-toggle-label{display:none}
    .main-nav{
        position:static;
        display:flex;
        flex-direction:row;
        align-items:center;
        gap:2px;
        padding:0;
        border:0;
        box-shadow:none;
        background:transparent;
    }
    .main-nav a{font-size:14px}
    .hero{padding:74px 0 48px}
    .hero-layout,.split-layout,.security-layout{
        grid-template-columns:1.02fr .98fr;
        gap:46px;
    }
    .hero-visual{min-height:540px}
    .trust-grid{grid-template-columns:repeat(4,1fr)}
    .category-grid,.feature-grid,.scenario-grid{
        grid-template-columns:repeat(3,1fr);
    }
    .article-grid,.faq-grid{grid-template-columns:repeat(2,1fr)}
    .steps{grid-template-columns:repeat(4,1fr)}
    .content-wrap{
        grid-template-columns:minmax(0,1fr) 340px;
        align-items:start;
    }
    .content-main{display:grid;gap:18px}
    .content-side{position:sticky;top:92px;display:grid;gap:18px}
    .footer-grid{grid-template-columns:1.6fr .7fr .7fr}
    .footer-bottom{flex-direction:row;justify-content:space-between}
}
@media (min-width:1180px){
    .hero h1{font-size:62px}
}