:root{
  --bg:#F5F9FE;--card:#FFFFFF;--soft:#E8F2FC;--soft2:#F3F8FF;
  --blue:#2F7BFF;--blue2:#1E5FD6;--title:#16324F;--text:#243447;
  --muted:#5B6B7C;--note:#7A8896;--line:rgba(47,123,255,.16);
  --shadow:0 12px 32px rgba(22,50,79,.08);--footer:#10243A;
}
*{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:1.72}
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{max-width:1220px;height:72px;margin:0 auto;padding:0 20px;display:flex;align-items:center;gap:18px;white-space:nowrap}
.brand-logo{width:160px;display:flex;align-items:center;flex:0 0 auto}
.brand-logo img{max-height:42px;width:auto}
.core-nav{display:flex;gap:4px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:999px;padding:5px;box-shadow:0 6px 20px rgba(22,50,79,.05)}
.core-nav a{padding:8px 12px;border-radius:999px;color:var(--title);font-size:14px}
.core-nav a.active{background:var(--soft);color:var(--blue2);font-weight:700}
.header-actions{margin-left:auto;display:flex;align-items:center;gap:8px}
.overview-btn{border:0;background:transparent;color:var(--title);cursor:pointer;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;border:1px solid var(--blue)}
.login-btn:hover,.main-btn:hover{background:var(--blue2)}
.register-btn{background:#fff;color:var(--title);border:1px solid #C5D7F0}
.menu-toggle{display:none;width:42px;height:42px;border:0;background:transparent;cursor:pointer;padding:9px}
.menu-toggle span{height:2px;background:var(--title);display:block;margin:5px 0;border-radius:2px}
main{min-height:70vh}
.container{max-width:1220px;margin:0 auto;padding:0 20px}
.section{padding:56px 0}
.section-tight{padding:38px 0}
.eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--blue2);background:var(--soft);border-radius:999px;padding:7px 12px;font-weight:700;font-size:13px}
h1,h2,h3{color:var(--title);line-height:1.28;margin-top:0}
h1{font-size:clamp(32px,4.5vw,56px);letter-spacing:-1px;margin-bottom:18px}
h2{font-size:clamp(25px,3vw,36px);margin-bottom:16px}
h3{font-size:18px;margin-bottom:9px}
.lead{font-size:18px;color:var(--muted);max-width:760px}
.muted{color:var(--muted)}
.note{color:var(--note);font-size:14px}
.card{background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:18px}
.hero{padding:54px 0 40px;position:relative;overflow:hidden}
.hero:before,.hero:after{content:"";position:absolute;border-radius:50%;filter:blur(10px);pointer-events:none}
.hero:before{width:240px;height:240px;background:rgba(47,123,255,.08);top:-100px;left:3%}
.hero:after{width:200px;height:200px;background:rgba(47,123,255,.06);right:2%;bottom:-110px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:36px;align-items:center;position:relative}
.hero-copy p{max-width:680px}
.hero-actions{display:flex;gap:10px;margin:24px 0 22px}
.hero-image{padding:18px;overflow:hidden}
.hero-image img{width:100%;max-height:360px}
.summary-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:24px}
.summary-item{background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px}
.summary-item b{display:block;color:var(--title);margin-bottom:3px}
.scroll-cats{display:flex;gap:12px;overflow-x:auto;padding:4px 2px 14px;scrollbar-width:thin}
.cat-card{min-width:210px;padding:16px;border-radius:16px;background:#fff;border:1px solid var(--line)}
.cat-card .num{color:var(--blue);font-size:12px;font-weight:800}
.info-strip{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:14px;background:var(--soft2);border:1px solid var(--line);border-radius:18px;padding:20px}
.duo{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.feature-panel{padding:22px}
.feature-panel img{width:100%;max-height:240px;margin-bottom:16px;border-radius:14px;background:var(--soft2)}
.topic-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.topic-card{padding:14px}
.topic-card img{width:100%;max-height:170px;background:var(--soft2);border-radius:12px;margin-bottom:12px}
.topic-card p{font-size:14px;color:var(--muted);min-height:50px}
.text-link{color:var(--blue2);font-weight:700}
.banner-split{display:grid;grid-template-columns:.9fr 1.1fr;gap:24px;align-items:center;padding:24px}
.banner-split img{max-height:260px}
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.news-card{overflow:hidden}
.news-card img{width:100%;max-height:180px;background:var(--soft2)}
.news-card .pad{padding:18px}
.safety-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.safety-grid .card{padding:20px}
.review-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.review{padding:20px}
.review .who{color:var(--blue2);font-weight:700;font-size:14px}
.faq-list{display:grid;gap:12px}
.faq-item{padding:18px 20px}
.faq-item h3{margin-bottom:6px}
.content-hero{padding:50px 0 28px}
.content-hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:32px;align-items:center}
.content-hero .card{padding:18px}
.content-hero img{max-height:300px;margin:auto}
.content-stack{display:grid;gap:20px}
.content-section{padding:24px}
.content-section p{margin:10px 0;color:var(--text)}
.content-grid-2{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.content-grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.step-list{counter-reset:step;display:grid;gap:12px}
.step{padding:16px 16px 16px 58px;position:relative}
.step:before{counter-increment:step;content:counter(step);position:absolute;left:16px;top:17px;width:30px;height:30px;display:grid;place-items:center;border-radius:50%;background:var(--soft);color:var(--blue2);font-weight:800}
.tag-row{display:flex;flex-wrap:wrap;gap:8px}
.tag{background:var(--soft2);border:1px solid var(--line);border-radius:999px;padding:7px 11px;font-size:13px;color:var(--title)}
.alert{background:#fff;border-left:4px solid var(--blue);border-radius:12px;padding:18px 20px;box-shadow:var(--shadow)}
.drawer-mask{position:fixed;inset:0;background:rgba(16,36,58,.36);opacity:0;visibility:hidden;transition:.25s;z-index:10000}
.drawer-mask.show{opacity:1;visibility:visible}
.drawer{position:fixed;top:0;bottom:0;width:min(410px,90vw);background:#fff;z-index:10001;overflow:auto;transition:transform .28s ease;box-shadow:0 20px 60px rgba(16,36,58,.18)}
.drawer-left{left:0;transform:translateX(-105%)}
.drawer-right{right:0;transform:translateX(105%)}
.drawer.open{transform:translateX(0)}
.drawer-head{height:70px;padding:0 20px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}
.drawer-head img{max-height:40px;max-width:150px}
.drawer-head button{border:0;background:var(--soft2);width:38px;height:38px;border-radius:50%;font-size:24px;color:var(--title);cursor:pointer}
.drawer-links{display:grid;grid-template-columns:1fr 1fr;padding:14px}
.drawer-links a{padding:11px 10px;border-bottom:1px solid rgba(47,123,255,.08);color:var(--title)}
.overview-groups{padding:18px}
.overview-groups section{padding:0 0 18px;margin-bottom:18px;border-bottom:1px solid var(--line)}
.overview-groups a{display:inline-block;margin:4px 10px 4px 0;color:var(--muted)}
.site-footer{background:var(--footer);color:#D7E6F5;margin-top:60px}
.footer-inner{max-width:1220px;margin:auto;padding:46px 20px;display:grid;grid-template-columns:1.1fr 1.9fr;gap:40px}
.footer-brand img{max-height:42px;max-width:170px;margin-bottom:16px}
.footer-brand p{max-width:470px;color:#BFD1E3}
.footer-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.footer-cols h3{color:#fff}
.footer-cols a{display:block;color:#D7E6F5;margin:7px 0}
.footer-note{border-top:1px solid rgba(255,255,255,.1);padding:16px 20px 24px;text-align:center;color:#BFD1E3;font-size:13px}
.mobile-bottom{display:none}
@media(max-width:980px){
  .core-nav,.overview-btn,.register-btn{display:none}
  .menu-toggle{display:block}
  .header-inner{height:68px}
  .brand-logo{position:absolute;left:50%;transform:translateX(-50%);width:auto}
  .brand-logo img{max-height:38px;max-width:150px}
  .header-actions{margin-left:auto}
  .hero-grid,.content-hero-grid,.banner-split{grid-template-columns:1fr}
  .summary-grid{grid-template-columns:repeat(2,1fr)}
  .topic-grid{grid-template-columns:repeat(3,1fr)}
  .info-strip{grid-template-columns:1fr 1fr}
  .info-strip>div:first-child{grid-column:1/-1}
}
@media(max-width:720px){
  body{padding-bottom:68px}
  .container{padding:0 15px}
  .section{padding:42px 0}
  .hero{padding:36px 0 24px}
  h1{font-size:34px}
  .lead{font-size:16px}
  .hero-image img{max-height:250px}
  .summary-grid,.duo,.news-grid,.safety-grid,.review-grid,.content-grid-2,.content-grid-3{grid-template-columns:1fr}
  .topic-grid{grid-template-columns:repeat(2,1fr);gap:12px}
  .topic-card{padding:10px}
  .topic-card img{max-height:130px}
  .topic-card p{min-height:0}
  .info-strip{grid-template-columns:1fr}
  .info-strip>div:first-child{grid-column:auto}
  .mobile-bottom{position:fixed;left:0;right:0;bottom:0;height:60px;background:#fff;border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(4,1fr);z-index:9998;box-shadow:0 -8px 22px rgba(22,50,79,.06)}
  .mobile-bottom a{display:grid;place-items:center;color:var(--title);font-weight:700;font-size:13px}
  .footer-inner{grid-template-columns:1fr;padding:36px 15px}
  .footer-cols{grid-template-columns:repeat(3,1fr);gap:10px}
  .footer-cols a{font-size:13px}
  .site-footer{margin-top:40px}
}