:root{
  --primary: rgb(70,139,223);
  --primary-dark: #245fbe;
  --primary-soft: #eef6ff;
  --ink: #14243d;
  --muted: #617089;
  --line: #dbe8f8;
  --card: rgba(255,255,255,.86);
  --shadow: 0 18px 48px rgba(42, 95, 154, .12);
  --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 8% 6%, rgba(70,139,223,.17), transparent 28%),
    linear-gradient(180deg,#f6fbff 0%,#ffffff 42%,#f3f8ff 100%);
  line-height:1.78;
  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(18px);
  border-bottom:1px solid rgba(219,232,248,.82);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;min-height:72px;gap:16px}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:800;color:#17345d;font-size:18px;letter-spacing:.2px}
.logo{width:38px;height:38px;border-radius:12px;object-fit:cover;box-shadow:0 8px 22px rgba(70,139,223,.22)}
.nav-toggle{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);background:#fff;color:#17345d;border-radius:12px;width:42px;height:42px;font-size:22px}
.site-nav{display:none;position:absolute;left:16px;right:16px;top:76px;padding:12px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
.site-nav.is-open{display:grid;gap:4px}
.site-nav a{padding:10px 12px;border-radius:12px;color:#3b4f6d;font-weight:600}
.site-nav a:hover{background:var(--primary-soft);color:var(--primary-dark)}
.section{padding:54px 0}
.section-tight{padding:34px 0}
.eyebrow,.badge{display:inline-flex;align-items:center;gap:8px;padding:6px 12px;border-radius:999px;background:rgba(70,139,223,.1);color:var(--primary-dark);font-weight:700;font-size:13px;border:1px solid rgba(70,139,223,.16)}
.hero{padding:46px 0 38px}
.hero-layout{display:grid;gap:28px;align-items:center}
.hero-copy h1,.page-hero h1{font-size:clamp(32px,8vw,58px);line-height:1.12;margin:18px 0 18px;letter-spacing:-1.5px;color:#10294d}
.hero-copy p,.page-hero p,.lead{font-size:17px;color:var(--muted);margin:0 0 22px}
.hero-tags,.tag-row{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0 24px}
.tag{padding:7px 11px;border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.76);color:#405672;font-size:13px;font-weight:650}
.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 32px rgba(70,139,223,.28);border:none;transition:transform .2s ease, box-shadow .2s ease, background .2s ease}
.download-btn:hover{transform:translateY(-2px);background:var(--primary-dark);box-shadow:0 18px 38px rgba(70,139,223,.34)}
.hero-visual{position:relative;min-height:420px;border-radius:30px;background:linear-gradient(145deg,rgba(70,139,223,.16),rgba(255,255,255,.9));border:1px solid rgba(70,139,223,.18);box-shadow:var(--shadow);padding:24px;overflow:hidden}
.phone-frame{width:min(260px,70%);margin:16px auto 0;padding:12px;border-radius:34px;background:#fff;box-shadow:0 24px 55px rgba(42,95,154,.18);border:1px solid #e5eefb}
.phone-frame img{border-radius:26px;width:100%;height:auto}
.status-card,.mini-card{position:absolute;background:rgba(255,255,255,.9);border:1px solid rgba(219,232,248,.92);border-radius:18px;padding:14px;box-shadow:0 16px 34px rgba(42,95,154,.12);backdrop-filter:blur(12px)}
.status-card{left:18px;bottom:22px;max-width:190px}
.status-card strong,.mini-card strong{display:block;color:#18345a;font-size:14px;margin-bottom:4px}.status-card span,.mini-card span{font-size:12px;color:var(--muted)}
.mini-card.one{right:18px;top:32px}.mini-card.two{right:28px;bottom:92px}.mini-card.three{left:28px;top:38px}
.trust-grid,.feature-grid,.category-grid,.scenario-grid,.faq-grid,.article-grid,.principle-grid{display:grid;gap:16px}
.trust-grid{grid-template-columns:1fr 1fr}
.trust-item,.category-card,.feature-card,.scenario-card,.faq-item,.content-card,.step,.principle,.notice-card{
  background:var(--card);border:1px solid rgba(219,232,248,.9);border-radius:var(--radius);padding:22px;box-shadow:0 10px 32px rgba(42,95,154,.08)
}
.trust-item strong{display:block;font-size:17px;color:#18345a}.trust-item span{color:var(--muted);font-size:14px}
.section-title{max-width:720px;margin:0 0 24px}.section-title h2{font-size:clamp(26px,5vw,38px);line-height:1.22;margin:10px 0 10px;color:#10294d}.section-title p{margin:0;color:var(--muted)}
.category-card{display:grid;gap:8px;transition:transform .18s ease,border-color .18s ease}.category-card:hover{transform:translateY(-3px);border-color:rgba(70,139,223,.4)}.category-card h3,.feature-card h3,.scenario-card h3,.content-card h3,.faq-item h3{margin:0;color:#17345d;line-height:1.34}.category-card p,.feature-card p,.scenario-card p,.content-card p,.faq-item p,.step p,.principle p{margin:0;color:var(--muted)}.card-link{color:var(--primary-dark);font-weight:800}
.feature-icon{width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,var(--primary),#8bbdff);display:inline-flex;align-items:center;justify-content:center;color:#fff;font-weight:900;margin-bottom:10px}
.security-layout,.split-layout{display:grid;gap:20px;align-items:center}.security-panel{background:linear-gradient(145deg,#fff, #edf6ff);border:1px solid rgba(70,139,223,.18);border-radius:28px;padding:24px;box-shadow:var(--shadow)}.security-panel ul,.check-list{padding:0;margin:0;list-style:none;display:grid;gap:12px}.security-panel li,.check-list li{padding:12px 14px;border-radius:14px;background:#fff;border:1px solid var(--line);color:#405672}.security-panel li:before,.check-list li:before{content:'✓';color:var(--primary-dark);font-weight:900;margin-right:8px}
.steps{display:grid;gap:16px;counter-reset:step}.step{position:relative}.step:before{counter-increment:step;content:counter(step);display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:12px;background:var(--primary);color:#fff;font-weight:900;margin-bottom:12px}.step h3{margin:0 0 6px;color:#17345d}
.cta-section{margin:28px 0 0;padding:34px 24px;border-radius:30px;text-align:center;background:linear-gradient(135deg,rgba(70,139,223,.12),rgba(255,255,255,.96));border:1px solid rgba(70,139,223,.18);box-shadow:var(--shadow)}.cta-section h2{font-size:clamp(24px,5vw,36px);margin:0 0 10px}.cta-section p{color:var(--muted);max-width:700px;margin:0 auto 20px}
.page-hero{padding:42px 0 28px;background:linear-gradient(180deg,rgba(70,139,223,.08),rgba(255,255,255,0));border-bottom:1px solid rgba(219,232,248,.5)}.page-hero .container{max-width:920px}.page-hero h1{font-size:clamp(30px,6vw,48px)}
.article-body{max-width:920px;margin:0 auto}.article-body p{color:#4b5f7d}.article-body h2{font-size:24px;margin-top:28px;color:#17345d}.article-grid{grid-template-columns:1fr}.notice-card{background:linear-gradient(145deg,#fff,#f2f8ff)}.notice-card h3{margin-top:0}.muted{color:var(--muted)}
.download-panel{text-align:center;max-width:760px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:30px;padding:30px;box-shadow:var(--shadow)}.download-panel .download-btn{margin:12px 0 8px}.only-one-note{font-size:13px;color:var(--muted)}
.faq-list{display:grid;gap:14px}.faq-item h2,.faq-item h3{font-size:18px;margin:0 0 8px}.faq-item p{margin:0;color:var(--muted)}
.site-footer{margin-top:48px;background:#10294d;color:#dfeaff;padding:42px 0 18px}.footer-grid{display:grid;gap:24px}.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:10px}.footer-brand img{width:34px;height:34px;border-radius:10px}.site-footer h3{margin:0 0 10px;color:#fff}.site-footer a{display:block;color:#dfeaff;margin:7px 0}.site-footer p{color:#bfd0e9;margin:0}.footer-bottom{border-top:1px solid rgba(255,255,255,.13);margin-top:26px;padding-top:16px;color:#a9bcda;font-size:13px}
@media (min-width:640px){.category-grid,.feature-grid,.scenario-grid,.faq-grid,.article-grid,.principle-grid{grid-template-columns:repeat(2,1fr)}.trust-grid{grid-template-columns:repeat(4,1fr)}}
@media (min-width:920px){.nav-toggle{display:none}.site-nav{position:static;display:flex;align-items:center;gap:2px;padding:0;border:0;box-shadow:none;background:transparent}.site-nav a{padding:9px 12px}.hero{padding:70px 0 58px}.hero-layout,.security-layout,.split-layout{grid-template-columns:1.02fr .98fr}.category-grid,.feature-grid,.scenario-grid{grid-template-columns:repeat(3,1fr)}.steps{grid-template-columns:repeat(4,1fr)}.footer-grid{grid-template-columns:1.5fr 1fr 1fr 1fr}.section{padding:70px 0}.article-grid,.principle-grid{grid-template-columns:repeat(3,1fr)}}
@media (max-width:420px){.container{width:min(100% - 24px,1120px)}.hero-visual{min-height:380px;padding:18px}.mini-card.three{display:none}.status-card{left:12px;bottom:16px}.mini-card.one{right:12px;top:20px}.mini-card.two{right:14px;bottom:78px}.trust-grid{grid-template-columns:1fr}.download-btn{width:100%;padding-left:18px;padding-right:18px}.cta-section .download-btn,.download-panel .download-btn{width:100%}}