:root{
  --bg:#F5F9FE;
  --surface:#FFFFFF;
  --soft:#E8F2FC;
  --soft2:#F3F8FF;
  --blue:#2F7BFF;
  --blue-deep:#1E5FD6;
  --title:#16324F;
  --text:#243447;
  --muted:#5B6B7C;
  --note:#7A8896;
  --border:rgba(47,123,255,0.16);
  --shadow:0 12px 32px rgba(22,50,79,0.08);
  --footer:#10243A;
  --footer-text:#D7E6F5;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:"Microsoft YaHei","PingFang SC","Noto Sans SC",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,input,textarea{font:inherit}
.site-header{position:sticky;top:0;z-index:9999;background:rgba(245,249,254,0.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
.header-inner{max-width:1240px;height:72px;margin:0 auto;padding:0 18px;display:flex;align-items:center;gap:18px;white-space:nowrap}
.brand-logo{flex:0 0 auto;display:flex;align-items:center}
.brand-logo img{height:40px;width:auto}
.desktop-core-nav{display:flex;align-items:center;gap:4px;background:#fff;border:1px solid var(--border);border-radius:999px;padding:5px;box-shadow:0 6px 20px rgba(22,50,79,.05);margin-left:auto}
.desktop-core-nav a{padding:7px 12px;border-radius:999px;color:var(--title);font-size:14px}
.desktop-core-nav a:hover,.desktop-core-nav a.active{background:var(--soft);color:var(--blue)}
.header-actions{display:flex;align-items:center;gap:8px;margin-left:6px}
.overview-btn,.login-btn,.register-btn,.main-btn{border-radius:999px;min-height:38px;padding:8px 16px;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:.2s ease}
.overview-btn{border:1px solid var(--border);background:var(--soft2);color:var(--title)}
.login-btn,.main-btn{border:1px solid var(--blue);background:var(--blue);color:#fff}
.register-btn{background:#fff;color:var(--title);border:1px solid #C5D7F0}
.overview-btn:hover,.register-btn:hover{border-color:var(--blue);color:var(--blue)}
.login-btn:hover,.main-btn:hover{background:var(--blue-deep)}
.mobile-menu-btn,.mobile-login{display:none}
.site-main{min-height:65vh}
.container{width:min(1180px,calc(100% - 36px));margin:0 auto}
.section{padding:58px 0}
.section.tight{padding:34px 0}
.section-title{display:flex;justify-content:space-between;gap:20px;align-items:end;margin-bottom:24px}
.section-title h2,.section-title h1{margin:0;color:var(--title);line-height:1.25}
.section-title p{margin:0;color:var(--muted);max-width:620px}
.eyebrow{display:inline-block;color:var(--blue);background:var(--soft);border:1px solid var(--border);border-radius:999px;padding:4px 10px;font-size:13px;font-weight:700;margin-bottom:14px}
.card{background:#fff;border:1px solid var(--border);box-shadow:var(--shadow);border-radius:16px}
.hero{padding:56px 0 36px;position:relative;overflow:hidden}
.hero:before,.hero:after{content:"";position:absolute;border-radius:50%;filter:blur(10px);pointer-events:none}
.hero:before{width:300px;height:300px;background:rgba(47,123,255,.08);right:4%;top:-90px}
.hero:after{width:220px;height:220px;background:rgba(232,242,252,.9);left:-80px;bottom:-80px}
.hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.05fr .95fr;gap:42px;align-items:center}
.hero h1{font-size:clamp(32px,4vw,52px);line-height:1.18;margin:0 0 18px;color:var(--title)}
.hero p{font-size:17px;color:var(--muted);margin:0 0 22px}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin:22px 0}
.hero-media{padding:18px;background:#fff;border:1px solid var(--border);border-radius:22px;box-shadow:var(--shadow)}
.hero-media img{width:100%;height:auto}
.hero-summaries{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:26px}
.hero-summary{background:#fff;border:1px solid var(--border);border-radius:14px;padding:14px}
.hero-summary strong{display:block;color:var(--title);margin-bottom:4px}
.hero-summary span{display:block;color:var(--muted);font-size:13px}
.quick-scroll{display:flex;gap:12px;overflow-x:auto;padding:4px 2px 12px;scrollbar-width:thin}
.quick-item{min-width:220px;background:#fff;border:1px solid var(--border);border-radius:14px;padding:15px;box-shadow:0 6px 20px rgba(22,50,79,.05)}
.quick-item .num{font-size:12px;color:var(--blue);font-weight:700}
.quick-item strong{display:block;color:var(--title);font-size:16px;margin:3px 0}
.quick-item p{margin:0;color:var(--muted);font-size:13px;line-height:1.6}
.info-strip{display:grid;grid-template-columns:1.2fr repeat(3,1fr);gap:1px;background:var(--border);border:1px solid var(--border);border-radius:18px;overflow:hidden}
.info-strip>div{background:#fff;padding:20px}
.info-strip .intro{background:var(--soft2)}
.info-strip strong{color:var(--title);display:block;margin-bottom:6px}
.info-strip p{margin:0;color:var(--muted);font-size:14px}
.dual-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.feature-card{padding:24px;min-height:250px;display:flex;flex-direction:column;justify-content:space-between}
.feature-card h3{margin:0 0 10px;color:var(--title);font-size:22px}
.feature-card p{color:var(--muted);margin:0 0 18px}
.text-link{color:var(--blue);font-weight:700}
.topic-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.topic-card{overflow:hidden;display:flex;flex-direction:column}
.topic-card .topic-image{background:var(--soft2);padding:14px;min-height:150px;display:flex;align-items:center;justify-content:center;border-bottom:1px solid var(--border)}
.topic-card .topic-image img{max-height:170px}
.topic-card .topic-body{padding:18px;display:flex;flex-direction:column;gap:8px;flex:1}
.topic-card h3{margin:0;color:var(--title)}
.topic-card p{margin:0;color:var(--muted);font-size:14px;flex:1}
.media-row{display:grid;grid-template-columns:.9fr 1.1fr;gap:26px;align-items:center;padding:24px}
.media-row.reverse{grid-template-columns:1.1fr .9fr}
.media-box{background:var(--soft2);border-radius:14px;padding:12px}
.media-box img{width:100%;height:auto}
.media-copy h2{margin:0 0 12px;color:var(--title)}
.media-copy p{color:var(--muted);margin:0 0 14px}
.news-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.news-card{overflow:hidden}
.news-card .media-box{border-radius:0;padding:12px}
.news-card .copy{padding:20px}
.news-card h3{margin:0 0 8px;color:var(--title)}
.news-card p{margin:0 0 12px;color:var(--muted)}
.safety-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:20px}
.check-list{display:grid;gap:10px;margin-top:16px}
.check-item{background:var(--soft2);border:1px solid var(--border);border-radius:12px;padding:13px 14px}
.check-item strong{color:var(--title)}
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.review{padding:20px}
.review strong{display:block;color:var(--title);margin-bottom:8px}
.review p{margin:0;color:var(--muted);font-size:14px}
.qa-list{display:grid;gap:12px}
.qa-item{background:#fff;border:1px solid var(--border);border-radius:14px;padding:18px}
.qa-item h3{margin:0 0 8px;color:var(--title);font-size:17px}
.qa-item p{margin:0;color:var(--muted)}
.notice{background:var(--soft2);border:1px solid var(--border);border-radius:16px;padding:20px}
.notice strong{display:block;color:var(--title);margin-bottom:6px}
.notice p{margin:0;color:var(--muted)}
.sub-hero{padding:44px 0 20px}
.sub-hero-wrap{display:grid;grid-template-columns:1.15fr .85fr;gap:26px;align-items:center}
.sub-hero h1{font-size:clamp(30px,4vw,46px);margin:0 0 14px;color:var(--title)}
.sub-hero p{margin:0;color:var(--muted);font-size:16px}
.sub-hero-media{padding:14px;min-height:220px;display:flex;align-items:center;justify-content:center}
.sub-hero-media img{max-height:280px}
.article-grid{display:grid;grid-template-columns:1.55fr .75fr;gap:24px}
.article-card{padding:26px}
.article-card h2{color:var(--title);margin:0 0 12px}
.article-card h3{color:var(--title);margin:24px 0 8px}
.article-card p{margin:0 0 15px;color:var(--text)}
.aside-stack{display:grid;gap:16px;align-content:start}
.aside-card{padding:20px}
.aside-card h2,.aside-card h3{margin:0 0 10px;color:var(--title)}
.aside-card ul{margin:0;padding-left:20px;color:var(--muted)}
.aside-card li{margin:7px 0}
.link-list{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
.link-list a{background:var(--soft2);border:1px solid var(--border);border-radius:10px;padding:10px 12px;color:var(--title);font-size:14px}
.link-list a:hover{color:var(--blue);border-color:var(--blue)}
.feedback-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.feedback-card{padding:18px}
.feedback-card strong{color:var(--title)}
.feedback-card p{color:var(--muted);margin:7px 0 0;font-size:14px}
.site-footer{background:var(--footer);color:var(--footer-text);margin-top:40px}
.footer-inner{max-width:1180px;margin:0 auto;padding:44px 18px 30px;display:grid;grid-template-columns:1.2fr 1fr;gap:40px}
.footer-brand img{height:40px;width:auto;margin-bottom:14px;filter:brightness(0) invert(1)}
.footer-brand p{max-width:520px;margin:0;color:#BFD2E6}
.footer-links{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.footer-links strong{display:block;color:#fff;margin-bottom:10px}
.footer-links a{display:block;color:#BFD2E6;margin:6px 0;font-size:14px}
.footer-links a:hover{color:#fff}
.footer-note{border-top:1px solid rgba(255,255,255,.1);max-width:1180px;margin:0 auto;padding:18px;color:#BFD2E6;font-size:13px}
.footer-note p{margin:4px 0}
.drawer-overlay{position:fixed;inset:0;background:rgba(16,36,58,.35);z-index:10000;opacity:0;transition:.2s}
.drawer-overlay.show{opacity:1}
.side-drawer{position:fixed;top:0;bottom:0;width:min(420px,88vw);background:#fff;z-index:10001;box-shadow:0 20px 60px rgba(16,36,58,.2);transition:transform .25s ease;overflow-y:auto}
.right-drawer{right:0;transform:translateX(105%)}
.left-drawer{left:0;transform:translateX(-105%)}
.side-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(--border)}
.drawer-head strong{font-size:18px;color:var(--title)}
.drawer-close{border:0;background:var(--soft2);width:38px;height:38px;border-radius:50%;color:var(--title);font-size:25px;cursor:pointer}
.drawer-groups{padding:18px}
.drawer-groups section{padding:14px 0;border-bottom:1px solid var(--border)}
.drawer-groups h2{font-size:15px;margin:0 0 8px;color:var(--title)}
.drawer-groups a{display:inline-block;padding:7px 9px;margin:3px;background:var(--soft2);border-radius:9px;color:var(--muted);font-size:14px}
.drawer-groups a:hover{color:var(--blue)}
.drawer-brand img{height:38px;width:auto}
.mobile-all-nav{padding:16px;display:grid;grid-template-columns:1fr 1fr;gap:8px}
.mobile-all-nav a{padding:11px 12px;background:var(--soft2);border:1px solid var(--border);border-radius:10px;color:var(--title);font-size:14px}
.mobile-bottom-nav{display:none}

@media (max-width:1000px){
  .desktop-core-nav a{padding:7px 9px}
  .topic-grid{grid-template-columns:repeat(3,1fr)}
  .review-grid,.feedback-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:860px){
  .header-inner{height:68px;justify-content:space-between}
  .desktop-core-nav,.header-actions{display:none}
  .mobile-menu-btn{display:flex;width:42px;height:42px;border:1px solid var(--border);border-radius:12px;background:#fff;flex-direction:column;align-items:center;justify-content:center;gap:4px}
  .mobile-menu-btn span{width:18px;height:2px;background:var(--title);border-radius:2px}
  .brand-logo{position:absolute;left:50%;transform:translateX(-50%)}
  .brand-logo img{height:36px}
  .mobile-login{display:inline-flex;padding:7px 14px;min-height:36px}
  .hero{padding-top:34px}
  .hero-grid,.sub-hero-wrap,.article-grid,.safety-grid,.media-row,.media-row.reverse{grid-template-columns:1fr}
  .hero-media{order:-1}
  .hero-summaries{grid-template-columns:repeat(2,1fr)}
  .info-strip{grid-template-columns:1fr 1fr}
  .dual-grid,.news-grid{grid-template-columns:1fr}
  .topic-grid{grid-template-columns:repeat(2,1fr)}
  .footer-inner{grid-template-columns:1fr}
  .mobile-bottom-nav{position:fixed;left:10px;right:10px;bottom:10px;z-index:9998;display:grid;grid-template-columns:repeat(4,1fr);background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow);overflow:hidden}
  .mobile-bottom-nav a{text-align:center;padding:11px 4px;color:var(--title);font-size:13px}
  body{padding-bottom:76px}
}
@media (max-width:620px){
  .container{width:min(100% - 24px,1180px)}
  .section{padding:44px 0}
  .section-title{display:block}
  .section-title p{margin-top:8px}
  .hero h1{font-size:34px}
  .hero p{font-size:15px}
  .hero-media{padding:10px}
  .hero-summaries{grid-template-columns:1fr 1fr}
  .info-strip{grid-template-columns:1fr}
  .topic-grid{gap:12px}
  .topic-card .topic-image{min-height:112px;padding:10px}
  .topic-card .topic-image img{max-height:130px}
  .topic-card .topic-body{padding:14px}
  .topic-card h3{font-size:16px}
  .topic-card p{font-size:13px}
  .review-grid,.feedback-grid{grid-template-columns:1fr}
  .footer-links{grid-template-columns:1fr 1fr}
  .sub-hero-media{min-height:160px}
  .article-card{padding:20px}
}