:root{
    --primary: rgb(70,139,223);
    --primary-dark:#1f5fae;
    --primary-soft:#eaf3ff;
    --ink:#102033;
    --muted:#5e728a;
    --line:#dce9f7;
    --card:#ffffff;
    --bg:#f7fbff;
    --radius:22px;
    --shadow:0 18px 50px rgba(27,80,140,.10);
}
*{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);
    line-height:1.75;
    background:linear-gradient(180deg,#f4f9ff 0%,#ffffff 34%,#f6fbff 100%);
    overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:min(1120px,calc(100% - 32px));margin:0 auto}
.site-header{
    position:sticky;top:0;z-index:50;
    background:rgba(255,255,255,.88);
    backdrop-filter:blur(16px);
    border-bottom:1px solid rgba(220,233,247,.86);
}
.header-inner{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:800;font-size:18px;letter-spacing:.02em;color:#123252}
.brand-logo{width:38px;height:38px;border-radius:12px;box-shadow:0 8px 24px rgba(70,139,223,.22)}
.site-nav{display:none;align-items:center;gap:4px}
.site-nav a{padding:10px 14px;border-radius:999px;color:#456078;font-size:14px;font-weight:650}
.site-nav a:hover,.site-nav a.active{background:var(--primary-soft);color:var(--primary-dark)}
.nav-toggle{width:42px;height:42px;border:1px solid var(--line);border-radius:14px;background:#fff;display:grid;place-items:center;gap:4px;padding:9px;cursor:pointer}
.nav-toggle span{width:18px;height:2px;background:#244560;border-radius:9px;display:block}
.site-nav.open{display:grid;position:absolute;left:16px;right:16px;top:74px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:20px;padding:10px}
.site-nav.open a{display:block;padding:12px 14px}
.section{padding:58px 0}
.section-tight{padding:36px 0}
.eyebrow,.badge{display:inline-flex;align-items:center;gap:8px;padding:6px 12px;border-radius:999px;background:rgba(70,139,223,.10);color:var(--primary-dark);font-weight:750;font-size:13px}
.hero{position:relative;padding:44px 0 64px;overflow:hidden}
.hero:before{content:"";position:absolute;inset:-120px -100px auto auto;width:440px;height:440px;background:radial-gradient(circle,rgba(70,139,223,.22),transparent 68%);pointer-events:none}
.hero-layout{display:grid;gap:32px;align-items:center}
.hero h1{font-size:clamp(34px,8vw,64px);line-height:1.08;margin:16px 0;color:#0f2740;letter-spacing:-.04em}
.hero p{font-size:17px;color:#536a80;margin:0 0 24px;max-width:660px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0}
.hero-tags span,.status-chip{padding:8px 12px;border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.82);color:#36546d;font-size:13px;font-weight:700}
.download-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 24px;border-radius:999px;background:var(--primary);color:#fff;font-weight:800;box-shadow:0 14px 30px rgba(70,139,223,.28);transition:transform .2s ease,box-shadow .2s ease,background .2s ease;border:0;cursor:pointer}
.download-btn:hover{transform:translateY(-2px);background:#347fda;box-shadow:0 18px 38px rgba(70,139,223,.34)}
.hero-visual{position:relative;min-height:420px;border-radius:32px;background:linear-gradient(140deg,#eaf4ff,#fff 58%,#dfeeff);border:1px solid rgba(180,210,242,.8);box-shadow:var(--shadow);padding:26px;display:grid;place-items:center;overflow:hidden}
.hero-visual:after{content:"";position:absolute;inset:auto -50px -80px auto;width:220px;height:220px;background:rgba(70,139,223,.12);border-radius:999px}
.app-image{width:min(270px,74%);filter:drop-shadow(0 24px 40px rgba(20,60,110,.2));z-index:1}
.float-card{position:absolute;z-index:2;background:rgba(255,255,255,.92);border:1px solid rgba(220,233,247,.94);border-radius:18px;padding:12px 14px;box-shadow:0 16px 36px rgba(34,80,130,.12);font-size:13px;color:#375169}
.float-card strong{display:block;color:#132b45;font-size:15px}.float-card.one{left:18px;top:24px}.float-card.two{right:18px;top:88px}.float-card.three{left:28px;bottom:40px}.float-card.four{right:28px;bottom:26px}
.trust-strip{display:grid;grid-template-columns:1fr;gap:14px;margin-top:-22px;position:relative;z-index:2}
.trust-item{background:#fff;border:1px solid var(--line);border-radius:20px;padding:18px;box-shadow:0 12px 34px rgba(34,80,130,.08)}
.trust-item strong{display:block;font-size:18px;color:#102842}.trust-item span{color:var(--muted);font-size:14px}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;margin-bottom:24px;flex-wrap:wrap}
.section-head h2{font-size:clamp(26px,4.5vw,40px);line-height:1.2;margin:0;color:#102842;letter-spacing:-.03em}.section-head p{max-width:640px;color:var(--muted);margin:0}
.category-grid,.feature-grid,.scenario-grid,.recommend-grid{display:grid;grid-template-columns:1fr;gap:16px}
.category-card,.feature-card,.scenario-card,.faq-item,.article-card,.info-panel,.step-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 12px 34px rgba(34,80,130,.06)}
.category-card{padding:20px;display:flex;flex-direction:column;gap:10px;min-height:160px}.category-card:hover{border-color:rgba(70,139,223,.55);transform:translateY(-2px);transition:.2s ease}.category-card h3,.feature-card h3,.scenario-card h3,.article-card h3{margin:0;color:#142c46}.category-card p,.feature-card p,.scenario-card p,.article-card p{margin:0;color:var(--muted)}.category-card .link{margin-top:auto;color:var(--primary-dark);font-weight:800}
.split-layout,.security-layout,.article-layout{display:grid;gap:24px;align-items:start}.panel-large{background:linear-gradient(145deg,#ffffff,#f1f7ff);border:1px solid var(--line);border-radius:28px;padding:26px;box-shadow:var(--shadow)}.panel-large h2{margin-top:0;font-size:clamp(25px,4vw,38px);line-height:1.2}.panel-large p{color:var(--muted)}
.feature-card,.scenario-card,.article-card{padding:22px}.feature-icon{width:42px;height:42px;border-radius:14px;background:var(--primary-soft);display:grid;place-items:center;color:var(--primary-dark);font-weight:900;margin-bottom:14px}.security-panel{background:linear-gradient(135deg,#eaf4ff,#ffffff);border:1px solid var(--line);border-radius:30px;padding:24px;box-shadow:var(--shadow)}.security-list{display:grid;gap:12px}.security-list div{padding:14px;border-radius:16px;background:#fff;border:1px solid var(--line)}.security-list strong{display:block;color:#14324f}.security-list span{color:var(--muted);font-size:14px}
.steps{display:grid;grid-template-columns:1fr;gap:14px;counter-reset:step}.step-card{padding:20px;position:relative}.step-card:before{counter-increment:step;content:counter(step);display:inline-grid;place-items:center;width:34px;height:34px;background:var(--primary);color:#fff;border-radius:12px;font-weight:900;margin-bottom:12px}.step-card h3{margin:0 0 6px}.step-card p{margin:0;color:var(--muted)}
.faq-list{display:grid;gap:14px}.faq-item{padding:20px}.faq-item h3{margin:0 0 8px;font-size:18px}.faq-item p{margin:0;color:var(--muted)}
.cta-section{padding:48px 24px;border-radius:32px;background:linear-gradient(135deg,#eaf4ff,#ffffff 60%,#dfeeff);border:1px solid var(--line);text-align:center;box-shadow:var(--shadow)}.cta-section h2{font-size:clamp(26px,5vw,42px);line-height:1.2;margin:0 0 12px}.cta-section p{max-width:720px;margin:0 auto 22px;color:var(--muted)}
.page-hero{padding:46px 0 28px;background:linear-gradient(180deg,#eef7ff,rgba(255,255,255,0));}.page-hero h1{font-size:clamp(32px,6vw,54px);line-height:1.15;margin:14px 0 12px;letter-spacing:-.035em}.page-hero p{color:var(--muted);font-size:17px;max-width:760px;margin:0}.article-main{display:grid;gap:18px}.article-main p{color:#4f657a;margin:0}.article-side{position:relative}.note-list{margin:0;padding-left:20px;color:var(--muted)}.note-list li{margin:8px 0}.notice{border-left:4px solid var(--primary);background:#f0f7ff;border-radius:18px;padding:18px;color:#38546d}.download-panel{display:flex;flex-direction:column;gap:16px;align-items:flex-start;background:linear-gradient(145deg,#fff,#edf6ff);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.download-flow{display:grid;grid-template-columns:1fr;gap:14px}.only-download .download-btn{margin-top:8px}.site-footer{margin-top:48px;background:#102842;color:#d8e8f7;padding:42px 0 20px}.footer-grid{display:grid;gap:22px}.footer-brand{display:flex;align-items:center;gap:10px;font-weight:850;color:#fff;font-size:18px}.footer-brand img{width:34px;height:34px;border-radius:10px}.site-footer p{color:#aecaeb;margin:12px 0 0}.site-footer h3{color:#fff;margin:0 0 10px;font-size:16px}.site-footer a{display:block;color:#c7ddf2;padding:4px 0;font-size:14px}.site-footer a:hover{color:#fff}.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:28px;padding-top:18px;color:#aecaeb;font-size:13px}
@media (min-width:640px){.trust-strip{grid-template-columns:repeat(2,1fr)}.category-grid,.feature-grid,.scenario-grid,.recommend-grid{grid-template-columns:repeat(2,1fr)}.download-flow{grid-template-columns:repeat(2,1fr)}}
@media (min-width:900px){.nav-toggle{display:none}.site-nav{display:flex}.hero{padding:72px 0 84px}.hero-layout{grid-template-columns:1.02fr .98fr;gap:48px}.trust-strip{grid-template-columns:repeat(4,1fr)}.category-grid,.feature-grid{grid-template-columns:repeat(3,1fr)}.scenario-grid,.recommend-grid{grid-template-columns:repeat(3,1fr)}.split-layout,.security-layout{grid-template-columns:1fr 1fr}.article-layout{grid-template-columns:minmax(0,1fr) 330px}.steps{grid-template-columns:repeat(4,1fr)}.footer-grid{grid-template-columns:1.5fr 1fr 1fr 1fr}.section{padding:78px 0}.hero-visual{min-height:500px}.site-nav.open{position:static;display:flex;box-shadow:none;border:0;padding:0;background:transparent}.site-nav.open a{display:inline-flex}}
@media (min-width:1120px){.container{width:min(1120px,calc(100% - 48px))}.hero h1{max-width:700px}}
@media (max-width:420px){.container{width:min(100% - 24px,1120px)}.hero-visual{min-height:360px;padding:16px;border-radius:24px}.float-card{position:static;margin:6px;justify-self:stretch}.hero-visual{display:flex;flex-direction:column}.app-image{order:-1;width:210px}.download-btn{width:100%}.section{padding:44px 0}.page-hero{padding-top:34px}}