:root{
  --bg:#F5F9FE;--surface:#FFFFFF;--soft:#E8F2FC;--soft2:#F3F8FF;
  --blue:#2F7BFF;--blue-deep:#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;--footerText:#D7E6F5;
}
*{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:1.78}
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:1240px;height:72px;margin:auto;padding:0 22px;display:flex;align-items:center;gap:18px;white-space:nowrap}
.brand-logo{display:flex;align-items:center;flex:0 0 auto}
.brand-logo img{height:42px;width:auto}
.core-nav{display:flex;align-items:center;gap:4px;background:#fff;border:1px solid var(--line);padding:5px;border-radius:999px;margin-left:8px}
.core-nav a{padding:7px 12px;border-radius:999px;color:var(--title);font-size:14px}
.core-nav a:hover,.core-nav a.is-active{background:var(--soft);color:var(--blue-deep)}
.header-actions{margin-left:auto;display:flex;align-items:center;gap:8px}
.overview-btn{border:1px solid var(--line);background:#fff;color:var(--title);border-radius:999px;padding:9px 13px;cursor:pointer}
.login-btn,.register-btn,.main-btn{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:8px 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(--blue-deep)}
.register-btn{background:#fff;color:var(--title);border:1px solid #C5D7F0}
.mobile-menu-btn,.mobile-login{display:none}
.site-main{min-height:60vh}
.container{max-width:1220px;margin:0 auto;padding:0 22px}
.section{padding:58px 0}
.section-tight{padding:34px 0}
.section-title{display:flex;justify-content:space-between;align-items:flex-end;gap:18px;margin-bottom:24px}
.section-title h2{margin:0;color:var(--title);font-size:30px;line-height:1.25}
.section-title p{margin:0;color:var(--muted);max-width:680px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;background:var(--soft);color:var(--blue-deep);border:1px solid var(--line);border-radius:999px;padding:6px 11px;font-size:13px;font-weight:700}
.hero{padding:58px 0 36px}
.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:34px;align-items:center}
.hero-copy h1{font-size:46px;line-height:1.18;color:var(--title);margin:16px 0}
.hero-copy p{font-size:17px;color:var(--muted);margin:0 0 22px}
.hero-card,.card,.content-card{background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:18px}
.hero-card{padding:20px}
.hero-card img{width:100%;height:auto}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap}
.hero-summaries{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:28px}
.summary-pill{background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 15px}
.summary-pill strong{display:block;color:var(--title);font-size:15px}
.summary-pill span{color:var(--muted);font-size:13px}
.scroll-cats{display:flex;gap:12px;overflow-x:auto;padding:4px 2px 10px;scrollbar-width:thin}
.cat-item{min-width:210px;background:#fff;border:1px solid var(--line);border-radius:15px;padding:15px}
.cat-item b{display:block;color:var(--blue);font-size:12px}
.cat-item strong{display:block;color:var(--title);margin:4px 0}
.cat-item span{color:var(--muted);font-size:13px}
.info-strip{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:18px;overflow:hidden;box-shadow:var(--shadow)}
.info-strip > div{background:#fff;padding:22px}
.info-strip strong{color:var(--title);display:block;margin-bottom:5px}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.card{padding:22px}
.card h3,.content-card h2,.content-card h3{color:var(--title);margin-top:0}
.card p{color:var(--muted)}
.text-link{color:var(--blue-deep);font-weight:700}
.media-card{display:grid;grid-template-columns:180px 1fr;gap:20px;align-items:center}
.media-card img{width:100%;max-height:160px}
.topic-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.topic-card{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column}
.topic-card .image-wrap{padding:14px 14px 0}
.topic-card img{width:100%;height:auto;border-radius:12px}
.topic-card .topic-body{padding:14px 16px 18px}
.topic-card h3{margin:0 0 6px;color:var(--title);font-size:18px}
.topic-card p{margin:0 0 9px;color:var(--muted);font-size:14px}
.banner-card{display:grid;grid-template-columns:.95fr 1.05fr;gap:26px;align-items:center;background:var(--soft2);border:1px solid var(--line);border-radius:20px;padding:24px;box-shadow:var(--shadow)}
.banner-card img{max-height:280px;margin:auto}
.banner-copy h2{color:var(--title);margin:0 0 10px}
.banner-copy p{color:var(--muted)}
.review-grid,.faq-grid,.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.quote{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;color:var(--muted)}
.quote strong{display:block;color:var(--title);margin-bottom:6px}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px}
.faq-item h3{font-size:17px;color:var(--title);margin:0 0 8px}
.faq-item p{margin:0;color:var(--muted)}
.page-hero{padding:46px 0 20px}
.page-hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:28px;align-items:center}
.page-hero h1{font-size:40px;line-height:1.2;color:var(--title);margin:12px 0}
.page-hero p{font-size:16px;color:var(--muted);margin:0}
.page-hero-media{background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px;box-shadow:var(--shadow)}
.page-hero-media img{width:100%;max-height:300px}
.content-wrap{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:24px}
.content-card{padding:28px}
.content-card p{margin:0 0 16px;color:var(--text)}
.content-card h2{font-size:25px;margin:30px 0 12px}
.content-card h3{font-size:19px;margin:24px 0 8px}
.side-stack{display:flex;flex-direction:column;gap:16px}
.side-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;box-shadow:var(--shadow)}
.side-card h3{margin:0 0 10px;color:var(--title)}
.side-card a{display:block;padding:8px 0;color:var(--blue-deep);border-bottom:1px solid var(--line)}
.side-card a:last-child{border-bottom:0}
.notice{background:var(--soft2);border:1px solid var(--line);border-left:4px solid var(--blue);border-radius:14px;padding:18px;color:var(--muted)}
.list-clean{padding:0;margin:0;list-style:none}
.list-clean li{padding:10px 0;border-bottom:1px solid var(--line)}
.list-clean li:last-child{border-bottom:0}
.kv-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.kv{background:var(--soft2);border:1px solid var(--line);border-radius:14px;padding:16px}
.kv strong{display:block;color:var(--title);margin-bottom:4px}
.kv span{color:var(--muted);font-size:14px}
.site-footer{background:var(--footer);color:var(--footerText);margin-top:60px}
.footer-inner{max-width:1220px;margin:auto;padding:44px 22px 40px}
.footer-brand{display:grid;grid-template-columns:230px 1fr;gap:24px;align-items:center}
.footer-brand img{width:210px;background:#fff;border-radius:12px;padding:8px}
.footer-brand p{margin:0;max-width:760px}
.footer-links{display:flex;flex-wrap:wrap;gap:16px 24px;margin:28px 0 18px}
.footer-links a{color:#fff}
.footer-note{color:#B9CEE2;font-size:13px;margin:0}
.drawer-backdrop{position:fixed;inset:0;background:rgba(16,36,58,.36);z-index:10000;opacity:0;pointer-events:none;transition:.2s}
.drawer-backdrop.show{opacity:1;pointer-events:auto}
.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);overflow-y:auto;transition:transform .25s ease;padding:18px}
.drawer-left{left:0;transform:translateX(-104%)}
.drawer-right{right:0;transform:translateX(104%)}
.drawer.open{transform:translateX(0)}
.drawer-head{display:flex;align-items:center;justify-content:space-between;gap:16px;border-bottom:1px solid var(--line);padding-bottom:14px}
.drawer-head img{height:38px;width:auto}
.drawer-close{width:38px;height:38px;border-radius:50%;border:1px solid var(--line);background:#fff;color:var(--title);font-size:24px;cursor:pointer}
.drawer-group{padding:18px 0;border-bottom:1px solid var(--line)}
.drawer-group h3{margin:0 0 9px;color:var(--title);font-size:15px}
.drawer-links{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.drawer-links a{padding:9px 10px;border-radius:10px;background:var(--soft2);color:var(--title);font-size:14px}
.menu-open{overflow:hidden}
.mobile-bottom{display:none}
@media(max-width:1000px){
  .header-inner{gap:12px;padding:0 16px}
  .core-nav a{padding:7px 9px}
  .overview-btn{display:none}
  .topic-grid{grid-template-columns:repeat(3,1fr)}
  .content-wrap{grid-template-columns:1fr}
  .side-stack{display:grid;grid-template-columns:1fr 1fr}
}
@media(max-width:780px){
  body{padding-bottom:66px}
  .site-header{height:64px}
  .header-inner{height:64px;justify-content:space-between}
  .core-nav,.header-actions,.overview-btn{display:none}
  .mobile-menu-btn{display:inline-flex;align-items:center;justify-content:center;width:42px;height:42px;border:1px solid var(--line);background:#fff;border-radius:12px;color:var(--title);font-size:20px}
  .brand-logo{position:absolute;left:50%;transform:translateX(-50%)}
  .brand-logo img{height:36px}
  .mobile-login{display:inline-flex;min-height:38px;padding:7px 14px}
  .container{padding:0 16px}
  .hero{padding-top:34px}
  .hero-grid,.page-hero-grid,.banner-card,.two-col{grid-template-columns:1fr}
  .hero-copy h1{font-size:34px}
  .page-hero h1{font-size:32px}
  .hero-card{order:-1}
  .hero-card img,.page-hero-media img{max-height:250px}
  .hero-summaries{grid-template-columns:1fr 1fr}
  .info-strip{grid-template-columns:1fr}
  .topic-grid{grid-template-columns:repeat(2,1fr);gap:12px}
  .review-grid,.faq-grid,.feature-grid{grid-template-columns:1fr}
  .media-card{grid-template-columns:120px 1fr}
  .section{padding:44px 0}
  .section-title{align-items:flex-start;flex-direction:column}
  .section-title h2{font-size:26px}
  .side-stack{grid-template-columns:1fr}
  .footer-brand{grid-template-columns:1fr}
  .mobile-bottom{position:fixed;display:grid;grid-template-columns:repeat(4,1fr);left:0;right:0;bottom:0;z-index:9998;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom)}
  .mobile-bottom a{text-align:center;padding:12px 6px;color:var(--title);font-size:14px}
}
@media(max-width:480px){
  .hero-copy h1{font-size:30px}
  .page-hero h1{font-size:29px}
  .topic-card .topic-body{padding:11px 12px 14px}
  .topic-card h3{font-size:16px}
  .topic-card p{font-size:13px}
  .media-card{grid-template-columns:1fr}
  .kv-grid{grid-template-columns:1fr}
}