:root{
  --primary: rgb(70,139,223);
  --primary-dark:#2467b8;
  --primary-soft:#eaf4ff;
  --text:#16324f;
  --muted:#5e7187;
  --line:#dfeaf6;
  --card:#ffffff;
  --bg:#f7fbff;
  --shadow:0 18px 45px rgba(33, 99, 171, .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 42%,#f7fbff 100%);
  line-height:1.75;
  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(16px);
  border-bottom:1px solid rgba(70,139,223,.12);
}
.nav-wrap{min-height:70px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:22px;color:#102d4b;letter-spacing:.3px}
.logo-img{width:42px;height:42px;border-radius:12px;box-shadow:0 8px 20px rgba(70,139,223,.18)}
.site-nav{display:none;gap:8px;align-items:center;flex-wrap:wrap}
.site-nav.open{display:flex;position:absolute;left:16px;right:16px;top:70px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:18px;padding:12px;flex-direction:column;align-items:stretch}
.site-nav a{font-size:15px;color:#314d6a;padding:10px 13px;border-radius:12px}
.site-nav a:hover,.site-nav a.active{color:var(--primary-dark);background:var(--primary-soft)}
.nav-toggle{width:44px;height:44px;border:1px solid var(--line);border-radius:14px;background:#fff;display:grid;place-items:center;gap:0;padding:10px;cursor:pointer}
.nav-toggle span{display:block;width:20px;height:2px;background:var(--text);margin:2px 0;border-radius:2px}
main{min-height:60vh}
.section{padding:54px 0}
.section-tight{padding:34px 0}
.section-head{max-width:740px;margin:0 auto 26px;text-align:center}
.section-head.left{text-align:left;margin-left:0}
.eyebrow,.badge{display:inline-flex;align-items:center;gap:6px;color:var(--primary-dark);background:var(--primary-soft);border:1px solid rgba(70,139,223,.16);padding:6px 12px;border-radius:999px;font-weight:700;font-size:13px}
h1,h2,h3{line-height:1.25;margin:0 0 14px;color:#102c4a}
h1{font-size:clamp(34px,7vw,58px);letter-spacing:-1px}
h2{font-size:clamp(25px,4.8vw,38px)}
h3{font-size:20px}
p{margin:0 0 14px;color:var(--muted)}
.hero{padding:48px 0 34px;background:radial-gradient(circle at 12% 8%,rgba(70,139,223,.14),transparent 28%),radial-gradient(circle at 88% 16%,rgba(70,139,223,.12),transparent 26%)}
.hero-layout{display:grid;gap:32px;align-items:center}
.hero-copy{padding:18px 0}
.hero-copy p{font-size:17px;max-width:640px}
.tag-row{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0}
.tag-row span{padding:8px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);box-shadow:0 10px 25px rgba(40,100,170,.06);color:#35506b;font-size:14px}
.download-btn{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:48px;padding:13px 24px;border-radius:999px;
  background:var(--primary);color:#fff;font-weight:800;
  box-shadow:0 14px 28px rgba(70,139,223,.28);
  transition:transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.download-btn:hover{transform:translateY(-2px);background:var(--primary-dark);box-shadow:0 18px 34px rgba(70,139,223,.32)}
.hero-visual{position:relative;min-height:430px;padding:22px;border-radius:30px;background:linear-gradient(145deg,rgba(255,255,255,.78),rgba(234,244,255,.92));border:1px solid rgba(70,139,223,.16);box-shadow:var(--shadow);overflow:hidden}
.hero-visual:before{content:"";position:absolute;width:260px;height:260px;right:-80px;top:-80px;border-radius:50%;background:rgba(70,139,223,.16)}
.app-frame{position:relative;z-index:1;width:min(260px,72%);margin:0 auto;border-radius:32px;filter:drop-shadow(0 24px 35px rgba(34,74,120,.17))}
.float-card{position:relative;z-index:2;background:rgba(255,255,255,.92);border:1px solid rgba(70,139,223,.16);box-shadow:0 14px 32px rgba(36,90,150,.12);border-radius:18px;padding:13px 15px;margin:10px auto;max-width:330px}
.float-card strong{display:block;color:#102c4a}.float-card span{font-size:13px;color:var(--muted)}
.float-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:12px;position:relative;z-index:2}
.float-grid div{background:#fff;border:1px solid var(--line);border-radius:16px;padding:10px;font-size:13px;color:#36526d;text-align:center}
.stats-strip{display:grid;gap:12px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:var(--radius);padding:14px}
.stat-item{padding:12px;border-radius:18px;background:linear-gradient(180deg,#f7fbff,#fff)}
.stat-item strong{display:block;font-size:18px;color:var(--primary-dark)}
.grid{display:grid;gap:16px}
.feature-grid,.category-grid,.scenario-grid,.recommend-grid{display:grid;gap:16px}
.card,.category-card,.feature-card,.scenario-card,.faq-item,.info-panel,.step-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 12px 30px rgba(35,87,142,.07);padding:22px;
}
.category-card{display:block;transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease}
.category-card:hover{transform:translateY(-3px);border-color:rgba(70,139,223,.45);box-shadow:var(--shadow)}
.category-card small,.card small{display:inline-block;color:var(--primary-dark);font-weight:800;margin-bottom:8px}
.feature-card .icon,.scenario-card .icon,.step-card .num{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;background:var(--primary-soft);color:var(--primary-dark);font-weight:900;margin-bottom:12px}
.steps{display:grid;gap:14px;counter-reset:step}
.step-card{position:relative;overflow:hidden}
.step-card:after{content:"";position:absolute;right:-36px;top:-36px;width:100px;height:100px;border-radius:50%;background:rgba(70,139,223,.08)}
.security-layout,.split-layout{display:grid;gap:22px;align-items:center}
.security-panel{background:linear-gradient(145deg,#ffffff,#eef7ff);border:1px solid rgba(70,139,223,.18);border-radius:28px;padding:22px;box-shadow:var(--shadow)}
.check-list{list-style:none;margin:16px 0 0;padding:0;display:grid;gap:10px}.check-list li{padding-left:28px;position:relative;color:#3f5872}.check-list li:before{content:"✓";position:absolute;left:0;top:0;color:var(--primary-dark);font-weight:900}
.process-line{display:grid;gap:12px}.process-line .process{background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px}.process b{color:var(--primary-dark)}
.cta-section{padding:44px 20px;border-radius:30px;background:linear-gradient(135deg,#eaf4ff,#ffffff 58%,#e8f4ff);border:1px solid rgba(70,139,223,.16);box-shadow:var(--shadow);text-align:center}
.page-hero{padding:44px 0 18px}.page-hero .container{display:grid;gap:14px}.page-hero p{max-width:800px;font-size:17px}
.article-layout{display:grid;gap:20px;align-items:start}.article-main{background:#fff;border:1px solid var(--line);border-radius:28px;padding:26px;box-shadow:var(--shadow)}
.article-side{display:grid;gap:14px}.notice{border-left:4px solid var(--primary);background:var(--primary-soft);border-radius:16px;padding:16px;color:#2d4f72}.notice p{margin:0}
.mini-list{display:grid;gap:12px;margin:18px 0}.mini-list div{padding:14px 16px;border-radius:16px;background:#f7fbff;border:1px solid var(--line)}
.table-like{display:grid;gap:10px}.table-like div{display:grid;gap:6px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:15px}.table-like b{color:#102c4a}.table-like span{color:var(--muted)}
.faq-list{display:grid;gap:14px}.faq-item h2,.faq-item h3{font-size:19px;margin-bottom:8px}.faq-item p{margin:0}
.site-footer{margin-top:40px;background:#102c4a;color:#d9e7f6;padding:42px 0 20px}.site-footer p,.site-footer a{color:#b9ccde}.site-footer a{display:block;margin:8px 0}.site-footer h3{color:#fff;font-size:16px}.footer-grid{display:grid;gap:24px}.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-size:20px}.footer-brand img{width:38px;height:38px;border-radius:12px}.copyright{border-top:1px solid rgba(255,255,255,.12);margin-top:30px;padding-top:18px;font-size:13px;color:#a9bfd4}
@media (min-width:640px){
  .category-grid,.feature-grid,.scenario-grid,.recommend-grid{grid-template-columns:repeat(2,1fr)}
  .stats-strip{grid-template-columns:repeat(2,1fr)}
  .table-like div{grid-template-columns:160px 1fr;align-items:start}
}
@media (min-width:900px){
  .nav-toggle{display:none}.site-nav{display:flex}.hero-layout{grid-template-columns:1.04fr .96fr}.section{padding:72px 0}.feature-grid,.category-grid,.scenario-grid{grid-template-columns:repeat(3,1fr)}.recommend-grid{grid-template-columns:repeat(4,1fr)}.stats-strip{grid-template-columns:repeat(4,1fr)}.steps{grid-template-columns:repeat(3,1fr)}.security-layout,.split-layout{grid-template-columns:1fr 1fr}.article-layout{grid-template-columns:minmax(0,1fr) 330px}.footer-grid{grid-template-columns:2fr 1fr 1fr 1fr}.process-line{grid-template-columns:repeat(4,1fr)}
}
@media (max-width:420px){
  .container{width:min(100% - 24px,1120px)}.hero-visual{min-height:390px;padding:16px}.float-grid{grid-template-columns:1fr}.download-btn{width:100%;padding-left:18px;padding-right:18px}h1{font-size:32px}.section{padding:42px 0}.article-main{padding:20px}
}