:root{
  --primary: rgb(70,139,223);
  --primary-dark:#2869b8;
  --primary-soft:#eaf3ff;
  --text:#142235;
  --muted:#5f6f83;
  --line:#dbe8f7;
  --panel:#ffffff;
  --bg:#f5f9ff;
  --shadow:0 14px 40px rgba(40,105,184,.10);
  --radius:22px;
}
*{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:linear-gradient(180deg,#f4f9ff 0%,#fff 38%,#f7fbff 100%);line-height:1.75;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:min(1120px,calc(100% - 36px));margin:0 auto}
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.88);backdrop-filter:blur(18px);border-bottom:1px solid rgba(219,232,247,.9)}
.header-inner{min-height:70px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;color:#122642;font-size:18px}.logo img{width:36px;height:36px;border-radius:12px;object-fit:contain;background:#fff;box-shadow:0 6px 18px rgba(70,139,223,.15)}
.nav-toggle{border:1px solid var(--line);background:#fff;border-radius:14px;width:42px;height:42px;font-size:22px;color:#193555}.site-nav{display:none;position:absolute;left:18px;right:18px;top:74px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:10px}.site-nav.open{display:grid}.site-nav a{padding:12px 14px;border-radius:12px;color:#3e5269;font-weight:650}.site-nav a.active,.site-nav a:hover{color:var(--primary-dark);background:var(--primary-soft)}
section{padding:54px 0}.section-title{font-size:28px;line-height:1.25;margin:0 0 12px;letter-spacing:-.02em}.section-lead{color:var(--muted);max-width:760px;margin:0 0 28px}.eyebrow,.badge{display:inline-flex;align-items:center;gap:6px;color:var(--primary-dark);background:var(--primary-soft);border:1px solid #d7eaff;border-radius:999px;padding:6px 12px;font-size:13px;font-weight:750}.hero{padding:46px 0 40px;background:radial-gradient(circle at 10% 5%,rgba(70,139,223,.16),transparent 32%),linear-gradient(135deg,#f7fbff,#edf6ff 60%,#fff)}.hero-layout{display:grid;gap:30px;align-items:center}.hero h1{font-size:38px;line-height:1.16;margin:16px 0 16px;letter-spacing:-.04em}.hero p{color:var(--muted);font-size:17px;margin:0 0 20px}.hero-tags,.tag-row{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0}.tag{font-size:13px;border:1px solid var(--line);background:rgba(255,255,255,.75);border-radius:999px;padding:7px 12px;color:#395069}.download-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:13px 25px;border-radius:999px;background:var(--primary);color:#fff!important;font-weight:800;box-shadow:0 14px 28px rgba(70,139,223,.25);border:0;cursor:pointer;transition:.22s ease}.download-btn:hover{transform:translateY(-2px);box-shadow:0 18px 34px rgba(70,139,223,.3)}.hero-visual{position:relative;padding:20px}.phone-card{position:relative;border:1px solid rgba(219,232,247,.95);border-radius:30px;background:rgba(255,255,255,.72);box-shadow:var(--shadow);padding:18px;overflow:hidden}.phone-card:before{content:"";position:absolute;inset:-60px auto auto -80px;width:170px;height:170px;background:rgba(70,139,223,.16);border-radius:50%}.phone-card img{margin:auto;max-height:430px;object-fit:contain}.status-card{position:absolute;left:0;bottom:4px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:13px 15px;box-shadow:0 14px 34px rgba(40,105,184,.14);font-weight:750}.status-card span{display:block;color:var(--muted);font-weight:600;font-size:12px}.float-tags{position:absolute;right:0;top:16px;display:grid;gap:9px}.float-tags em{font-style:normal;background:#fff;border:1px solid var(--line);border-radius:14px;padding:8px 10px;font-size:12px;color:#36516d;box-shadow:0 10px 26px rgba(40,105,184,.1)}
.trust-strip{padding:22px 0}.trust-grid{display:grid;grid-template-columns:1fr;gap:14px}.trust-item{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px;box-shadow:0 10px 28px rgba(40,105,184,.06)}.trust-item strong{display:block;font-size:18px;margin-bottom:4px}.trust-item span{color:var(--muted);font-size:14px}.category-grid,.feature-grid,.scenario-grid,.article-grid{display:grid;gap:16px}.category-card,.feature-card,.scenario-card,.article-card,.info-card,.faq-item,.step,.page-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:0 10px 28px rgba(40,105,184,.07)}.category-card{transition:.2s ease}.category-card:hover{transform:translateY(-3px);border-color:#b9d9ff}.category-card h3,.feature-card h3,.scenario-card h3,.article-card h3{margin:0 0 8px;font-size:19px}.category-card p,.feature-card p,.scenario-card p,.article-card p,.info-card p,.page-card p{margin:0;color:var(--muted)}.card-link{display:inline-flex;margin-top:14px;color:var(--primary-dark);font-weight:800}.split-layout,.security-layout,.guide-layout{display:grid;gap:22px;align-items:center}.soft-panel{background:linear-gradient(145deg,#fff,#eef6ff);border:1px solid var(--line);border-radius:28px;padding:26px;box-shadow:var(--shadow)}.metric-list{display:grid;gap:13px}.metric{display:flex;justify-content:space-between;gap:14px;border-bottom:1px solid var(--line);padding:0 0 13px}.metric:last-child{border-bottom:0;padding-bottom:0}.metric b{color:#172a43}.metric span{color:var(--muted);text-align:right}.feature-card .icon,.step-number{width:42px;height:42px;border-radius:14px;background:var(--primary-soft);color:var(--primary-dark);display:grid;place-items:center;font-weight:900;margin-bottom:14px}.security-panel{background:linear-gradient(145deg,#f6fbff,#fff);border:1px solid #cfe4ff;border-radius:28px;padding:26px;box-shadow:var(--shadow)}.security-row{display:flex;gap:14px;padding:15px 0;border-bottom:1px solid var(--line)}.security-row:last-child{border-bottom:0}.security-dot{width:12px;height:12px;flex:0 0 auto;margin-top:8px;border-radius:50%;background:var(--primary)}.steps{display:grid;gap:16px;counter-reset:step}.step{position:relative}.step-number{margin-bottom:10px}.cta-section{padding:46px 0}.cta-box{text-align:center;background:linear-gradient(135deg,#edf6ff,#fff);border:1px solid #cfe4ff;border-radius:30px;padding:34px 22px;box-shadow:var(--shadow)}.cta-box h2{margin:0 0 10px;font-size:28px}.cta-box p{margin:0 auto 20px;max-width:680px;color:var(--muted)}.page-hero{padding:42px 0 20px;background:radial-gradient(circle at 20% 10%,rgba(70,139,223,.13),transparent 34%)}.page-hero h1{font-size:34px;line-height:1.2;margin:14px 0 12px}.page-hero p{color:var(--muted);max-width:780px;margin:0}.content-section{padding:30px 0 54px}.prose{display:grid;gap:18px}.prose p{margin:0;color:#33465d}.note-list{margin:14px 0 0;padding:0;list-style:none;display:grid;gap:10px}.note-list li{padding:12px 14px;border-radius:14px;background:var(--primary-soft);color:#2c4c70;border:1px solid #d7eaff}.faq-list{display:grid;gap:14px}.faq-item h2,.faq-item h3{margin:0 0 8px;font-size:18px}.faq-item p{margin:0;color:var(--muted)}.download-panel{text-align:center;max-width:760px;margin:0 auto}.download-steps{display:grid;gap:14px;margin:28px 0}.warning{background:#fff8e8;border-color:#f0d599}.warning h3{margin:0 0 8px;color:#6c4b00}.site-footer{background:#10243b;color:#d8e6f6;padding:42px 0 20px;margin-top:20px}.footer-grid{display:grid;gap:24px}.footer-brand{font-weight:900;font-size:20px;margin-bottom:10px}.site-footer p{color:#b8c9dc;margin:0}.site-footer h3{margin:0 0 10px;color:#fff;font-size:16px}.site-footer a{display:block;color:#c8d8eb;margin:7px 0}.copyright{border-top:1px solid rgba(255,255,255,.12);margin-top:26px;padding-top:18px;color:#98aec6;font-size:13px}
@media (min-width:640px){.category-grid,.trust-grid{grid-template-columns:repeat(2,1fr)}.feature-grid,.scenario-grid,.article-grid{grid-template-columns:repeat(2,1fr)}.download-steps{grid-template-columns:repeat(2,1fr)}}
@media (min-width:900px){.nav-toggle{display:none}.site-nav{position:static;display:flex!important;align-items:center;gap:4px;background:transparent;border:0;box-shadow:none;padding:0}.hero{padding:72px 0}.hero-layout,.split-layout,.security-layout,.guide-layout{grid-template-columns:1.05fr .95fr}.hero h1{font-size:56px}.section-title{font-size:36px}.category-grid,.feature-grid,.scenario-grid,.article-grid,.trust-grid{grid-template-columns:repeat(3,1fr)}.trust-grid{grid-template-columns:repeat(4,1fr)}.steps{grid-template-columns:repeat(4,1fr)}.footer-grid{grid-template-columns:1.5fr .7fr .7fr}.page-hero h1{font-size:46px}.download-steps{grid-template-columns:repeat(4,1fr)}}
@media (max-width:420px){.container{width:min(100% - 28px,1120px)}.hero h1{font-size:32px}.section-title{font-size:25px}.phone-card{padding:12px;border-radius:24px}.float-tags{position:static;margin-top:12px}.status-card{position:static;margin-top:12px}.hero-visual{padding:0}.download-btn{width:100%;min-height:50px}}