:root{
  --primary: rgb(70,139,223);
  --primary-dark:#2367b4;
  --primary-soft:#eaf4ff;
  --text:#102033;
  --muted:#5f7085;
  --line:#dbe8f7;
  --card:#ffffff;
  --bg:#f7fbff;
  --shadow:0 18px 45px rgba(55,112,178,.13);
  --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,#eef7ff 0%,#ffffff 36%,#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% - 32px));margin:0 auto}
.site-header{
  position:sticky;top:0;z-index:20;
  background:rgba(255,255,255,.88);
  backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(219,232,247,.85);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;min-height:70px;gap:16px}
.logo,.footer-logo{display:flex;align-items:center;gap:10px;font-weight:800;color:#102a49;letter-spacing:.2px}
.logo img,.footer-logo img{width:38px;height:38px;border-radius:12px}
.nav-toggle{border:1px solid var(--line);background:#fff;border-radius:12px;padding:7px 11px;font-size:22px;color:var(--primary-dark)}
.main-nav{display:none;position:absolute;left:16px;right:16px;top:70px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:12px}
.main-nav.is-open{display:grid;gap:4px}
.main-nav a{padding:10px 12px;border-radius:12px;color:#334a62;font-size:15px}
.main-nav a:hover{background:var(--primary-soft);color:var(--primary-dark)}
.section{padding:54px 0}
.section-tight{padding:34px 0}
.section-title{max-width:760px;margin:0 auto 28px;text-align:center}
.section-title h2{font-size:clamp(26px,4vw,40px);line-height:1.2;margin:0 0 12px;color:#0d233c}
.section-title p{margin:0;color:var(--muted)}
.hero{padding:48px 0 42px;background:radial-gradient(circle at top right,rgba(70,139,223,.22),transparent 30%),linear-gradient(135deg,#f2f8ff 0%,#ffffff 54%,#eaf4ff 100%)}
.hero-layout{display:grid;gap:30px;align-items:center}
.eyebrow,.badge{display:inline-flex;align-items:center;gap:8px;padding:6px 12px;border-radius:999px;background:#edf6ff;color:var(--primary-dark);font-size:13px;font-weight:700;border:1px solid #d6eafd}
h1{font-size:clamp(32px,8vw,58px);line-height:1.12;margin:16px 0;color:#0b223b;letter-spacing:-1px}
.lead{font-size:17px;color:#41556b;max-width:660px;margin:0 0 22px}
.hero-tags,.tag-row{display:flex;flex-wrap:wrap;gap:10px;margin:20px 0}
.hero-tags span,.tag-row span,.mini-tag{padding:7px 11px;border:1px solid #d9e8f7;border-radius:999px;background:rgba(255,255,255,.75);color:#496176;font-size:13px}
.download-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:12px 24px;border-radius:999px;background:var(--primary);color:#fff;font-weight:800;box-shadow:0 14px 28px rgba(70,139,223,.28);transition:.2s ease;border:none;cursor:pointer;white-space:nowrap}
.download-btn:hover{transform:translateY(-2px);box-shadow:0 20px 34px rgba(70,139,223,.34)}
.hero-visual{position:relative;min-height:390px;display:flex;align-items:center;justify-content:center;padding:22px;border-radius:30px;background:linear-gradient(150deg,rgba(255,255,255,.88),rgba(235,247,255,.86));border:1px solid rgba(209,228,248,.9);box-shadow:var(--shadow);overflow:hidden}
.hero-visual:before{content:"";position:absolute;width:260px;height:260px;border-radius:50%;background:rgba(70,139,223,.14);right:-80px;top:-80px}
.product-frame{position:relative;width:min(260px,70%);z-index:2}
.status-card,.floating-card{position:absolute;z-index:3;background:rgba(255,255,255,.9);border:1px solid #d9e8f7;border-radius:18px;box-shadow:0 12px 30px rgba(34,92,160,.14);padding:12px 14px;font-size:13px;color:#30475e}
.status-card{left:16px;top:18px}.floating-card.key{right:18px;top:86px}.floating-card.verify{left:22px;bottom:74px}.floating-card.protect{right:16px;bottom:18px}
.status-card strong,.floating-card strong{display:block;color:#0d2c4d;font-size:14px}.dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--primary);margin-right:6px}
.trust-grid,.feature-grid,.category-grid,.scenario-grid,.recommend-grid,.page-grid{display:grid;gap:16px}
.trust-grid{grid-template-columns:1fr 1fr}
.trust-item,.card,.category-card,.feature-card,.scenario-card,.faq-item,.info-panel,.step,.guide-box{background:var(--card);border:1px solid #dceafa;border-radius:var(--radius);box-shadow:0 10px 30px rgba(40,89,148,.08)}
.trust-item{padding:18px}.trust-item strong{display:block;font-size:18px;color:#0e2d4c}.trust-item span{font-size:13px;color:var(--muted)}
.category-card,.feature-card,.scenario-card,.faq-item,.card,.guide-box{padding:22px}
.category-card{display:flex;flex-direction:column;gap:10px;transition:.2s ease;background:linear-gradient(180deg,#fff,#f8fcff)}
.category-card:hover{transform:translateY(-3px);border-color:#bfdcff;box-shadow:var(--shadow)}
.category-card h3,.feature-card h3,.scenario-card h3,.faq-item h3,.card h3{margin:0 0 8px;color:#102a49;font-size:20px}
.category-card p,.feature-card p,.scenario-card p,.faq-item p,.card p,.guide-box p{margin:0;color:var(--muted)}
.card-link{font-weight:800;color:var(--primary-dark);margin-top:auto}
.feature-card .icon,.scenario-card .icon{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-layout,.split-layout{display:grid;gap:24px;align-items:center}
.security-panel{padding:26px;border-radius:28px;background:linear-gradient(135deg,#ffffff,#eef7ff);border:1px solid #d9e8f7;box-shadow:var(--shadow)}
.security-panel ul,.check-list{padding:0;margin:18px 0 0;list-style:none;display:grid;gap:12px}
.security-panel li,.check-list li{position:relative;padding-left:28px;color:#40556c}
.security-panel li:before,.check-list li:before{content:"✓";position:absolute;left:0;top:0;color:var(--primary);font-weight:900}
.steps{display:grid;gap:16px;counter-reset:step}
.step{padding:22px;position:relative;overflow:hidden}.step:before{counter-increment:step;content:counter(step);display:grid;place-items:center;width:36px;height:36px;border-radius:12px;background:var(--primary);color:#fff;font-weight:900;margin-bottom:14px}.step h3{margin:0 0 8px}.step p{margin:0;color:var(--muted)}
.cta-section{padding:42px 22px;border-radius:30px;background:linear-gradient(135deg,#eaf4ff,#ffffff 60%,#e8f3ff);border:1px solid #d6e8fa;text-align:center;box-shadow:var(--shadow)}
.cta-section h2{font-size:clamp(26px,4vw,40px);margin:0 0 10px}.cta-section p{max-width:680px;margin:0 auto 22px;color:var(--muted)}
.page-hero{padding:48px 0 26px;background:linear-gradient(135deg,#edf7ff,#fff)}
.page-hero h1{font-size:clamp(30px,6vw,48px);max-width:860px}.page-hero p{max-width:780px;color:#475d73}
.content-layout{display:grid;gap:22px;align-items:start}.article{background:#fff;border:1px solid #dceafa;border-radius:28px;padding:24px;box-shadow:0 12px 32px rgba(40,89,148,.08)}
.article h2{margin-top:0;color:#0f2d4b}.article p{color:#40566d}.article .download-btn{margin-top:12px}
.side-panel{background:linear-gradient(180deg,#f5fbff,#fff);border:1px solid #dceafa;border-radius:24px;padding:22px;position:relative}
.side-panel h3{margin-top:0}.side-panel ul{padding-left:18px;color:#53687d}.side-panel li{margin:8px 0}
.faq-list{display:grid;gap:16px}.faq-item h2{font-size:20px;margin:0 0 8px;color:#102a49}.faq-item p{margin:0;color:var(--muted)}
.site-footer{margin-top:40px;padding:42px 0 20px;background:#0f2742;color:#d9e8f7}.footer-grid{display:grid;gap:24px}.site-footer p{color:#adc2d8;max-width:440px}.site-footer a{display:block;color:#c7dbef;margin:7px 0}.site-footer h3{color:#fff;margin:0 0 10px}.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:24px;padding-top:16px;color:#9fb6cd;font-size:14px}.footer-logo img{background:#fff}.footer-logo span{color:#fff}
.notice{padding:16px;border-radius:18px;background:#f1f8ff;border:1px solid #d6e8fa;color:#38516a}.kpi-strip{display:grid;gap:14px}.kpi{padding:16px;border-radius:18px;background:#fff;border:1px solid #dceafa}.kpi b{display:block;color:#0d2c4d}.kpi span{color:#60748a;font-size:13px}.quote-panel{padding:24px;border-radius:24px;background:#f4f9ff;border-left:4px solid var(--primary);color:#40566d}
@media (min-width:640px){.category-grid,.feature-grid,.scenario-grid,.page-grid{grid-template-columns:repeat(2,1fr)}.trust-grid{grid-template-columns:repeat(4,1fr)}.kpi-strip{grid-template-columns:repeat(2,1fr)}}
@media (min-width:900px){
  .nav-toggle{display:none}.main-nav{display:flex;position:static;background:transparent;border:none;box-shadow:none;padding:0;gap:6px}.main-nav a{padding:8px 12px}
  .hero{padding:76px 0 64px}.hero-layout{grid-template-columns:1.05fr .95fr;gap:44px}.hero-visual{min-height:500px}
  .category-grid,.feature-grid,.scenario-grid,.recommend-grid{grid-template-columns:repeat(3,1fr)}
  .security-layout,.split-layout,.content-layout{grid-template-columns:1fr 1fr}.content-layout{grid-template-columns:minmax(0,1.35fr) minmax(260px,.65fr)}
  .steps{grid-template-columns:repeat(4,1fr)}.footer-grid{grid-template-columns:1.6fr .7fr .7fr}.article{padding:34px}.page-hero{padding:68px 0 34px}.kpi-strip{grid-template-columns:repeat(4,1fr)}
}
@media (max-width:420px){.container{width:min(100% - 24px,1120px)}.hero-visual{min-height:330px;padding:14px}.floating-card,.status-card{font-size:12px;padding:9px 10px}.floating-card.key{right:10px}.floating-card.verify{left:10px}.status-card{left:10px}.download-btn{width:100%}.trust-grid{grid-template-columns:1fr}}