:root{
  --bg:#F5F9FE;--surface:#FFFFFF;--soft:#E8F2FC;--softer:#F3F8FF;--blue:#2F7BFF;--blue-deep:#1E5FD6;
  --title:#16324F;--text:#243447;--muted:#5B6B7C;--hint:#7A8896;--line:rgba(47,123,255,.16);
  --shadow:0 12px 32px rgba(22,50,79,.08);--radius:16px;--max:1220px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.75}
body.drawer-open{overflow:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;object-fit:contain;display:block}
button{font:inherit}
.site-header{position:sticky;top:0;z-index:9999;background:rgba(245,249,254,.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.header-inner{height:72px;max-width:var(--max);margin:auto;padding:0 20px;display:flex;align-items:center;gap:18px;white-space:nowrap}
.logo-link{width:158px;display:flex;align-items:center;flex:0 0 auto}
.logo-link img{max-height:42px;width:auto}
.core-nav{display:flex;align-items:center;gap:5px;background:#fff;border:1px solid var(--line);padding:5px;border-radius:999px;margin:auto}
.core-nav a{padding:8px 13px;border-radius:999px;color:var(--title);font-size:14px}
.core-nav a.active,.core-nav a:hover{background:var(--soft);color:var(--blue)}
.header-actions{display:flex;align-items:center;gap:8px;margin-left:auto}
.overview-btn,.menu-toggle{border:0;background:transparent;color:var(--title);cursor:pointer}
.overview-btn{padding:9px 10px}
.login-btn,.register-btn,.main-btn{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:0 18px;border-radius:999px;font-weight:700}
.login-btn,.main-btn{background:var(--blue);color:#fff}
.login-btn:hover,.main-btn:hover{background:var(--blue-deep)}
.register-btn{background:#fff;color:var(--title);border:1px solid #C5D7F0}
.menu-toggle{font-size:25px;width:42px;height:42px}
main{min-height:60vh}
.container{max-width:var(--max);margin:auto;padding:0 20px}
.section{padding:58px 0}
.section-sm{padding:34px 0}
.section-title{margin:0 0 10px;color:var(--title);font-size:clamp(25px,3vw,36px);line-height:1.25}
.section-lead{margin:0 0 28px;color:var(--muted);max-width:780px}
.card{background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:var(--radius)}
.hero{padding:56px 0 42px;background:
 radial-gradient(circle at 82% 18%,rgba(47,123,255,.12),transparent 28%),
 radial-gradient(circle at 12% 70%,rgba(47,123,255,.07),transparent 25%)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:38px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:7px;background:var(--soft);color:var(--blue-deep);border-radius:999px;padding:6px 12px;font-size:14px;margin-bottom:14px}
.hero h1,.inner-hero h1{color:var(--title);font-size:clamp(34px,4.6vw,56px);line-height:1.12;margin:0 0 18px}
.hero p{font-size:17px;color:var(--muted);margin:0 0 22px}
.hero-media{padding:18px;overflow:hidden}
.hero-media img{width:100%;height:auto}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin:22px 0}
.summary-row{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:26px}
.summary-item{padding:14px 15px;border-radius:14px;background:#fff;border:1px solid var(--line)}
.summary-item strong{display:block;color:var(--title);font-size:15px}
.summary-item span{display:block;color:var(--hint);font-size:13px;margin-top:4px}
.quick-scroll{display:flex;gap:12px;overflow-x:auto;padding:3px 2px 12px;scrollbar-width:thin}
.quick-card{min-width:210px;padding:16px 17px}
.quick-card b{display:block;color:var(--blue);font-size:13px;margin-bottom:6px}
.quick-card h3{margin:0 0 5px;color:var(--title);font-size:17px}
.quick-card p{margin:0;color:var(--muted);font-size:14px}
.info-strip{display:grid;grid-template-columns:1.15fr .85fr;gap:20px;padding:26px}
.info-strip h2{margin:0 0 8px;color:var(--title)}
.info-strip p{margin:0;color:var(--muted)}
.pill-list{display:flex;gap:9px;flex-wrap:wrap;align-content:center}
.pill{padding:8px 12px;border-radius:999px;background:var(--softer);border:1px solid var(--line);color:var(--title);font-size:14px}
.two-col{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.feature-card{padding:24px}
.feature-card h3{color:var(--title);font-size:23px;margin:12px 0 8px}
.feature-card p{color:var(--muted);margin:0 0 12px}
.text-link{color:var(--blue-deep);font-weight:700}
.text-link:hover{text-decoration:underline}
.topic-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.topic-card{overflow:hidden}
.topic-card .img-wrap{padding:14px 14px 0;background:linear-gradient(180deg,var(--softer),#fff)}
.topic-card img{width:100%;height:150px;object-fit:contain}
.topic-card .body{padding:17px}
.topic-card h3{color:var(--title);margin:0 0 6px;font-size:18px}
.topic-card p{margin:0 0 10px;color:var(--muted);font-size:14px}
.app-banner{display:grid;grid-template-columns:.9fr 1.1fr;gap:28px;align-items:center;padding:28px}
.app-banner .media{background:var(--softer);border-radius:14px;padding:16px}
.app-banner h2{font-size:30px;color:var(--title);margin:0 0 10px}
.app-banner p{color:var(--muted);margin:0 0 10px}
.media-card{overflow:hidden}
.media-card img{width:100%;height:190px;object-fit:contain;background:var(--softer);padding:14px}
.media-card .body{padding:20px}
.media-card h3{margin:0 0 8px;color:var(--title)}
.media-card p{margin:0 0 10px;color:var(--muted)}
.security-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.security-card{padding:22px}
.security-card h3{color:var(--title);margin:0 0 7px}
.security-card p{margin:0;color:var(--muted)}
.review-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.review{padding:20px}
.review .who{font-weight:700;color:var(--title);margin-bottom:5px}
.review p{margin:0;color:var(--muted)}
.faq-list{display:grid;gap:12px}
.faq-item{padding:20px}
.faq-item h3{margin:0 0 7px;color:var(--title);font-size:18px}
.faq-item p{margin:0;color:var(--muted)}
.notice{padding:22px;border-left:4px solid var(--blue);background:var(--softer)}
.notice h2{margin:0 0 7px;color:var(--title)}
.notice p{margin:0;color:var(--muted)}
.inner-hero{padding:52px 0 30px}
.inner-hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:28px;align-items:center}
.inner-hero h1{font-size:clamp(32px,4vw,48px)}
.inner-hero p{font-size:16px;color:var(--muted);max-width:720px}
.inner-media{padding:16px;background:#fff}
.inner-media img{width:100%;max-height:300px;object-fit:contain}
.content-grid{display:grid;grid-template-columns:1fr .34fr;gap:22px;align-items:start}
.article{padding:28px}
.article h2{color:var(--title);margin:30px 0 10px;font-size:25px}
.article h2:first-child{margin-top:0}
.article p{margin:0 0 16px;color:var(--text)}
.article ul{padding-left:20px;color:var(--text)}
.side-card{padding:20px;position:sticky;top:90px}
.side-card h2{font-size:19px;color:var(--title);margin:0 0 10px}
.side-card a{display:block;padding:9px 0;border-bottom:1px solid var(--line);color:var(--muted)}
.side-card a:last-child{border-bottom:0}
.quote{padding:17px 18px;background:var(--softer);border-radius:13px;color:var(--muted);margin:12px 0}
.drawer-mask{position:fixed;inset:0;background:rgba(16,36,58,.28);z-index:10000;opacity:0;visibility:hidden;transition:.25s}
.drawer-mask.show{opacity:1;visibility:visible}
.drawer{position:fixed;top:0;bottom:0;width:min(420px,88vw);background:#fff;z-index:10001;transition:transform .28s ease;overflow-y:auto;box-shadow:0 24px 80px rgba(16,36,58,.2)}
.left-drawer{left:0;transform:translateX(-105%)}
.right-drawer{right:0;transform:translateX(105%);width:min(520px,92vw)}
.drawer.open{transform:translateX(0)}
.drawer-head{height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 18px;border-bottom:1px solid var(--line)}
.drawer-head img{max-height:40px;max-width:160px}
.drawer-head button{border:0;background:var(--softer);width:38px;height:38px;border-radius:50%;font-size:24px;color:var(--title);cursor:pointer}
.drawer-links{display:grid;grid-template-columns:repeat(2,1fr);gap:4px;padding:14px}
.drawer-links a,.overview-groups a{padding:10px 11px;border-radius:10px;color:var(--text)}
.drawer-links a:hover,.overview-groups a:hover{background:var(--softer);color:var(--blue)}
.overview-groups{padding:18px;display:grid;gap:18px}
.overview-groups section{padding:14px;border:1px solid var(--line);border-radius:14px}
.overview-groups h2{font-size:15px;color:var(--blue-deep);margin:0 0 6px}
.overview-groups a{display:inline-block;width:49%}
.site-footer{background:#10243A;color:#D7E6F5;margin-top:58px}
.footer-inner{max-width:var(--max);margin:auto;padding:42px 20px 48px}
.footer-brand{display:grid;grid-template-columns:180px 1fr;gap:24px;align-items:center}
.footer-brand img{max-height:42px;width:auto;filter:brightness(0) invert(1)}
.footer-brand p{margin:0;color:#D7E6F5}
.footer-links{display:flex;gap:16px;flex-wrap:wrap;margin:25px 0 16px}
.footer-links a{color:#fff}
.footer-note{margin:0;color:#AFC6DD;font-size:13px;max-width:980px}
.mobile-only,.mobile-bottom{display:none}
@media (max-width:980px){
  .topic-grid{grid-template-columns:repeat(3,1fr)}
  .core-nav{gap:1px}.core-nav a{padding:8px 9px}
  .logo-link{width:138px}
  .content-grid{grid-template-columns:1fr}
  .side-card{position:static}
}
@media (max-width:760px){
  body{padding-bottom:64px}
  .desktop-only,.core-nav{display:none!important}
  .mobile-only{display:flex}
  .header-inner{height:64px;padding:0 12px;justify-content:space-between}
  .logo-link{width:auto;position:absolute;left:50%;transform:translateX(-50%)}
  .logo-link img{max-height:36px;max-width:138px}
  .header-actions{margin-left:auto}.login-btn{min-height:38px;padding:0 15px}
  .hero{padding:34px 0 22px}.hero-grid,.inner-hero-grid,.info-strip,.app-banner{grid-template-columns:1fr}
  .hero-grid{gap:22px}.hero h1,.inner-hero h1{font-size:34px}
  .hero-media{padding:12px}.summary-row{grid-template-columns:repeat(2,1fr)}
  .section{padding:42px 0}.section-sm{padding:28px 0}
  .two-col,.review-grid{grid-template-columns:1fr}
  .topic-grid{grid-template-columns:repeat(2,1fr);gap:12px}
  .topic-card img{height:118px}.topic-card .body{padding:14px}.topic-card p{font-size:13px}
  .security-grid{grid-template-columns:1fr}
  .media-card img{height:160px}
  .article{padding:20px}
  .mobile-bottom{position:fixed;left:0;right:0;bottom:0;height:58px;background:#fff;border-top:1px solid var(--line);z-index:9998;align-items:center;justify-content:space-around;box-shadow:0 -6px 22px rgba(22,50,79,.08)}
  .mobile-bottom a{font-size:14px;color:var(--title);font-weight:700}
  .footer-brand{grid-template-columns:1fr}
}
@media (max-width:420px){
  .container{padding:0 14px}
  .topic-grid{gap:10px}
  .topic-card img{height:100px}
  .topic-card h3{font-size:16px}
  .summary-row{gap:9px}
}