:root{
    --primary: rgb(70,139,223);
    --primary-strong: #2f74d0;
    --primary-soft: #eaf4ff;
    --primary-soft-2: #f5f9ff;
    --ink: #142238;
    --muted: #637083;
    --line: #dbe8f7;
    --card: #ffffff;
    --bg: #f7fbff;
    --radius: 22px;
    --shadow: 0 18px 50px rgba(48,94,148,.11);
}
*{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 10% 0%, rgba(70,139,223,.13), transparent 30%),
      linear-gradient(180deg,#f7fbff 0%,#ffffff 38%,#f6faff 100%);
    line-height:1.72;
    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,.88);
    backdrop-filter: blur(14px);
    border-bottom:1px solid rgba(219,232,247,.75);
}
.nav-wrap{min-height:70px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:800;color:#152844;letter-spacing:.2px}
.logo{width:38px;height:38px;border-radius:12px}
.site-nav{display:none;gap:8px;align-items:center;width:100%;padding:0 0 18px}
.site-nav a{display:block;padding:11px 12px;border-radius:14px;color:#41536a;font-weight:650;font-size:14px}
.site-nav a:hover,.site-nav a.active{color:var(--primary-strong);background:var(--primary-soft)}
.nav-toggle{display:none}
.nav-toggle-label{width:42px;height:42px;display:grid;place-content:center;gap:5px;border:1px solid var(--line);border-radius:14px;background:white}
.nav-toggle-label span{width:20px;height:2px;background:#31506f;border-radius:999px;display:block}
.nav-toggle:checked ~ .site-nav{display:block;position:absolute;left:16px;right:16px;top:70px;width:auto;background:white;border:1px solid var(--line);border-radius:20px;padding:10px;box-shadow:var(--shadow)}
.section{padding:54px 0}
.section-tight{padding:36px 0}
.eyebrow,.badge{display:inline-flex;align-items:center;gap:8px;padding:6px 12px;border-radius:999px;background:var(--primary-soft);color:var(--primary-strong);font-size:13px;font-weight:800}
.center{text-align:center}.narrow{max-width:760px;margin-inline:auto}.lead{font-size:17px;color:#4e6075;margin:16px auto 0}.muted{color:var(--muted)}
.gradient-panel{background:linear-gradient(135deg,#ffffff 0%,#edf6ff 100%);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:28px}
.hero-banner{padding:58px 0 32px}
.hero-layout{display:grid;grid-template-columns:1fr;gap:26px;align-items:center}
.hero-copy h1{font-size:clamp(34px,8vw,62px);line-height:1.08;margin:18px 0 18px;letter-spacing:-1.8px;color:#11233a}
.hero-copy p{font-size:17px;color:#53657b;max-width:620px;margin:0 0 24px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center}.download-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:13px 22px;border-radius:999px;background:var(--primary);color:white;font-weight:800;box-shadow:0 14px 26px rgba(70,139,223,.24);border:0;cursor:pointer;transition:.2s ease}.download-btn:hover{transform:translateY(-1px);background:var(--primary-strong)}
.security-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}.security-tags span,.soft-tag{padding:8px 11px;border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.78);color:#3e536b;font-size:13px;font-weight:700}
.product-console{position:relative;padding:22px;overflow:hidden}.console-bg{position:absolute;inset:0;background:radial-gradient(circle at 70% 20%,rgba(70,139,223,.24),transparent 32%),linear-gradient(160deg,#ffffff,#eef7ff);z-index:0}.phone-stage{position:relative;z-index:1;display:grid;grid-template-columns:1fr;gap:16px;align-items:center}.app-frame{background:#fff;border:1px solid rgba(219,232,247,.95);border-radius:30px;padding:18px;box-shadow:0 24px 60px rgba(23,77,130,.15);max-width:330px;margin:0 auto}.status-stack{display:grid;gap:12px}.status-card{background:rgba(255,255,255,.86);border:1px solid var(--line);border-radius:18px;padding:14px;box-shadow:0 10px 32px rgba(42,79,118,.08)}.status-card strong{display:block;font-size:15px}.status-card span{display:block;color:var(--muted);font-size:13px;margin-top:4px}
.trust-grid,.category-grid,.feature-grid,.scenario-grid,.risk-grid{display:grid;grid-template-columns:1fr;gap:16px}.trust-card,.category-card,.feature-card,.scenario-card,.faq-item,.info-card,.doc-card{background:rgba(255,255,255,.88);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:0 12px 34px rgba(42,79,118,.06)}.trust-card strong{font-size:19px;color:#17304f}.trust-card p,.category-card p,.feature-card p,.scenario-card p,.info-card p,.doc-card p{margin:8px 0 0;color:var(--muted)}
.section-head{display:flex;flex-direction:column;gap:8px;margin-bottom:22px}.section-head h2{font-size:clamp(25px,5vw,38px);line-height:1.2;margin:0;letter-spacing:-.8px}.section-head p{margin:0;color:var(--muted);max-width:760px}
.category-card{position:relative;overflow:hidden}.category-card:after{content:"";position:absolute;right:-40px;top:-40px;width:110px;height:110px;border-radius:50%;background:rgba(70,139,223,.08)}.category-card h3,.feature-card h3,.scenario-card h3,.info-card h3,.doc-card h3{margin:0 0 8px;font-size:19px}.card-link{display:inline-flex;margin-top:14px;color:var(--primary-strong);font-weight:800}.card-link:after{content:" →"}
.security-layout{display:grid;grid-template-columns:1fr;gap:20px;align-items:start}.security-panel{padding:24px}.principle-list{display:grid;gap:12px;margin:18px 0 0}.principle{display:grid;grid-template-columns:42px 1fr;gap:12px;align-items:start;background:white;border:1px solid var(--line);border-radius:18px;padding:14px}.principle b{width:34px;height:34px;border-radius:12px;background:var(--primary-soft);color:var(--primary-strong);display:grid;place-items:center}.principle p{margin:3px 0 0;color:var(--muted)}
.steps{display:grid;grid-template-columns:1fr;gap:14px;counter-reset:step}.step{position:relative;padding:20px;border-radius:22px;background:white;border:1px solid var(--line);box-shadow:0 12px 32px rgba(42,79,118,.06)}.step:before{counter-increment:step;content:counter(step,decimal-leading-zero);display:inline-grid;place-items:center;width:42px;height:42px;border-radius:15px;background:var(--primary);color:white;font-weight:900;margin-bottom:12px}.step h3{margin:0 0 6px}.step p{margin:0;color:var(--muted)}.step a{display:inline-block;margin-top:12px;color:var(--primary-strong);font-weight:800}
.faq-list{display:grid;gap:14px}.faq-item h3{font-size:18px;margin:0 0 8px}.faq-item p{margin:0;color:var(--muted)}
.cta-section{padding:58px 0}.cta-box{padding:34px;text-align:center}.cta-box h2{font-size:clamp(26px,5vw,42px);margin:0 0 12px}.cta-box p{max-width:680px;margin:0 auto 22px;color:var(--muted)}
.page-hero{padding:54px 0 26px}.page-title-card{padding:30px}.page-title-card h1{font-size:clamp(31px,6vw,50px);line-height:1.15;margin:16px 0}.page-title-card p{margin:0;color:var(--muted);max-width:780px;font-size:17px}.doc-layout{display:grid;grid-template-columns:1fr;gap:22px;align-items:start}.doc-main{display:grid;gap:18px}.doc-aside{display:grid;gap:14px}.check-list{padding:0;margin:14px 0 0;list-style:none;display:grid;gap:10px}.check-list li{padding:12px 14px;border:1px solid var(--line);background:#fff;border-radius:15px;color:#43566d}.check-list li:before{content:"✓";color:var(--primary-strong);font-weight:900;margin-right:8px}.notice{background:var(--primary-soft);border-left:4px solid var(--primary);border-radius:18px;padding:18px;color:#35506b}.download-line{margin-top:18px}
.site-footer{margin-top:40px;background:#10243d;color:#dce8f5;padding:42px 0 20px}.footer-grid{display:grid;grid-template-columns:1fr;gap:24px}.footer-brand{font-size:22px;font-weight:900;color:white}.site-footer p{color:#b9c9db;max-width:460px}.site-footer h3{font-size:15px;color:#fff;margin:0 0 10px}.site-footer a{display:block;color:#c7d8e9;margin:7px 0}.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:26px;padding-top:18px;color:#98abc0;font-size:13px}
@media (min-width:640px){.trust-grid,.category-grid,.feature-grid,.scenario-grid,.risk-grid{grid-template-columns:repeat(2,1fr)}.phone-stage{grid-template-columns:.9fr 1fr}.footer-grid{grid-template-columns:1.4fr 1fr 1fr}.page-title-card{padding:42px}}
@media (min-width:860px){.nav-toggle-label{display:none}.site-nav{display:flex;width:auto;padding:0}.hero-layout{grid-template-columns:1.02fr .98fr;gap:42px}.hero-banner{padding:78px 0 42px}.phone-stage{grid-template-columns:1fr}.status-stack{grid-template-columns:1fr 1fr}.category-grid,.feature-grid,.scenario-grid,.risk-grid{grid-template-columns:repeat(3,1fr)}.category-card.wide,.feature-card.wide{grid-column:span 2}.security-layout{grid-template-columns:1.05fr .95fr;gap:30px}.steps{grid-template-columns:repeat(3,1fr)}.doc-layout{grid-template-columns:minmax(0,1fr) 320px}.doc-aside{position:sticky;top:92px}.section{padding:74px 0}.cta-box{padding:48px}}
@media (min-width:1080px){.hero-copy h1{max-width:720px}.product-console{padding:30px}.category-card.tall,.feature-card.tall{grid-row:span 2}.feature-card.wide{min-height:230px}}