/* Same CSS as original - see build_site.py */
:root{--primary:#4f46e5;--primary-d:#4338ca;--accent:#7c3aed;--accent-d:#6d28d9;--cta:#2563eb;--cta-d:#1d4ed8;--bg:#f8fafc;--card:#fff;--text:#1e293b;--muted:#64748b;--border:#e2e8f0;--border-strong:#cbd5e1;--radius:12px;--radius-lg:16px;--shadow-sm:0 1px 2px rgba(16,24,40,.06);--shadow-md:0 6px 16px rgba(16,24,40,.08);--shadow-lg:0 18px 40px rgba(16,24,40,.12);--grad:linear-gradient(135deg,#4f46e5 0%,#7c3aed 100%)}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.75;-webkit-font-smoothing:antialiased}
img{max-width:100%}
.ks-header{background:#fff;border-bottom:1px solid #EFF4F8;position:sticky;top:0;z-index:200;box-shadow:0 1px 4px rgba(0,0,0,.06)}
.ks-header-inner{max-width:1200px;margin:0 auto;display:flex;align-items:center;height:56px;padding:0 20px}
.ks-logo{display:flex;align-items:center;margin-right:8px;flex-shrink:0}
.ks-logo a{display:flex;align-items:center}
.ks-logo img{height:36px}
.ks-logo-txt{font-size:18px;font-weight:700;color:#20B7F8;text-decoration:none}
.ks-nav{display:flex;align-items:center;flex:1}
.ks-nav-item{position:relative;height:56px;display:flex;align-items:center}
.ks-nav-item>a,.ks-nav-item>span{display:flex;align-items:center;gap:4px;padding:0 14px;height:56px;font-size:14px;color:#111;text-decoration:none;white-space:nowrap;cursor:pointer;border-radius:8px;transition:background .15s,color .15s}
.ks-nav-item:hover>a,.ks-nav-item:hover>span{background:rgba(183,233,255,.25);color:#20B7F8}
.ks-arrow{width:8px;height:6px;flex-shrink:0}
.ks-drop{display:none;position:absolute;top:100%;left:50%;transform:translateX(-50%);padding-top:12px;z-index:300}
.ks-nav-item:hover .ks-drop{display:block}
.ks-drop-inner{display:flex;padding:28px 24px;border-radius:8px;background:linear-gradient(180deg,#edfbff 0,#fff 100%);box-shadow:0 16px 40px rgba(0,0,0,.1);white-space:nowrap}
.ks-drop-col{padding:0 16px;min-width:112px;font-size:14px;display:flex;flex-direction:column}
.ks-drop-col:first-child{padding-left:0}
.ks-drop-col:last-child{padding-right:0}
.ks-drop-col+.ks-drop-col{border-left:1px solid #EFF4F8}
.ks-drop-col-title{font-weight:900;color:#111;margin-bottom:8px}
.ks-drop-col a{display:block;margin-top:14px;color:#111;text-decoration:none;font-size:14px}
.ks-drop-col a:hover{color:#20B7F8}
.ks-nav-special{margin-left:4px}
a{color:var(--primary-d);text-decoration:none;transition:color .2s}
a:hover{color:var(--accent-d)}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.skip-link{position:absolute;left:-999px;top:0;background:var(--primary);color:#fff;padding:10px 16px;border-radius:0 0 8px 8px;z-index:2000}
.skip-link:focus{left:24px}
.site-header{background:rgba(255,255,255,.88);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--border);position:sticky;top:56px;z-index:100;box-shadow:0 1px 3px rgba(0,0,0,.04)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px;gap:16px}
.logo{display:inline-flex;align-items:center;gap:8px;font-weight:800;font-size:20px;color:var(--text);transition:opacity .2s}
.logo:hover{opacity:.85;color:var(--text)}
.logo-mark{font-size:24px}
.logo-sub{color:var(--muted);font-weight:500;font-size:13px;margin-left:2px;background:#f3f4f6;padding:2px 8px;border-radius:5px}
.main-nav{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.nav-link{color:#475569;font-weight:500;font-size:14.5px;padding:8px 13px;border-radius:8px;position:relative;transition:color .2s,background .2s}
.nav-link::after{content:"";position:absolute;left:13px;right:13px;bottom:4px;height:2px;background:var(--primary);border-radius:2px;width:0;transition:width .25s ease}
.nav-link:hover{color:var(--primary-d);background:#f8fafc}
.nav-link:hover::after,.nav-link.active::after{width:calc(100% - 26px)}
.nav-link.active{color:var(--primary-d)}
.nav-cta{background:var(--grad);color:#fff!important;font-weight:600;padding:9px 20px;border-radius:9px;box-shadow:0 4px 14px rgba(79,70,229,.35);transition:transform .2s,box-shadow .2s}
.nav-cta:hover{transform:translateY(-1px);box-shadow:0 6px 20px rgba(79,70,229,.45);color:#fff}
.nav-toggle{display:none;flex-direction:column;justify-content:space-between;width:26px;height:20px;background:none;border:none;cursor:pointer;padding:0}
.nav-toggle span{display:block;height:2px;width:100%;background:#1e293b;border-radius:2px;transition:transform .3s,opacity .3s}
.hero{position:relative;background:var(--grad);color:#fff;padding:74px 0 64px;overflow:hidden;border-radius:var(--radius-lg)}
.hero::before,.hero::after{content:"";position:absolute;border-radius:50%;filter:blur(60px);opacity:.4;animation:float 8s ease-in-out infinite}
.hero::before{width:300px;height:300px;background:#a5b4fc;top:-90px;right:-40px}
.hero::after{width:260px;height:260px;background:#c4b5fd;bottom:-100px;left:-30px;animation-delay:2s}
.hero .container{position:relative;z-index:1}
.hero-inner{text-align:center;padding:0 24px}
.hero-badge{display:inline-block;background:rgba(255,255,255,.18);backdrop-filter:blur(4px);border:1px solid rgba(255,255,255,.22);padding:7px 16px;border-radius:999px;font-size:13.5px;font-weight:600;margin-bottom:20px;animation:fadeUp .8s ease both}
.hero-text h1{font-size:42px;line-height:1.25;font-weight:800;letter-spacing:-.5px;margin-bottom:18px;animation:fadeUp .8s ease .1s both}
.hero-text p{font-size:17px;opacity:.94;max-width:640px;margin:0 auto 26px;animation:fadeUp .8s ease .2s both}
.btn-primary{display:inline-block;background:#fff;color:var(--primary-d)!important;font-weight:700;padding:14px 30px;border-radius:11px;font-size:16px;box-shadow:0 10px 26px rgba(0,0,0,.22);transition:transform .2s,box-shadow .2s}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 32px rgba(0,0,0,.28)}
.trust-badge-group{display:flex;gap:10px;flex-wrap:wrap;font-size:12.5px;color:#f3e8ff}
.trust-badge{background:rgba(255,255,255,.16);padding:5px 12px;border-radius:999px;border:1px solid rgba(255,255,255,.18)}
@keyframes fadeUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-24px)}}
.download-hero{padding:40px 0 8px}
.download-hero-inner{display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:center;background:var(--grad);border-radius:24px;padding:42px;color:#fff;box-shadow:var(--shadow-lg);position:relative;overflow:hidden}
.download-hero-inner::after{content:"";position:absolute;width:240px;height:240px;border-radius:50%;background:#c4b5fd;filter:blur(60px);opacity:.35;top:-80px;right:-40px;animation:float 9s ease-in-out infinite}
.download-hero-text{position:relative;z-index:1}
.download-hero-text h2{font-size:28px;margin-bottom:12px;font-weight:800}
.download-hero-text p{color:#e9d5ff;margin-bottom:20px;font-size:16px}
.download-hero-visual{position:relative;z-index:1}
.download-cta-container{display:flex;flex-direction:column;align-items:flex-start;gap:10px}
.section-title{font-size:28px;font-weight:800;margin-bottom:8px;text-align:center;letter-spacing:-.3px;color:var(--text)}
.section-sub{text-align:center;color:var(--muted);margin-bottom:34px;font-size:16px}
.hub-grid-section{padding:60px 0;background:#fff}
.hub-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:22px}
.hub-card{display:block;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-lg);padding:30px 22px;transition:transform .25s ease,box-shadow .25s ease,border-color .25s;text-align:center}
.hub-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:var(--primary);color:var(--text)}
.hub-card-icon{font-size:38px;margin-bottom:12px;display:inline-block;transition:transform .3s ease}
.hub-card:hover .hub-card-icon{transform:scale(1.14) rotate(-5deg)}
.hub-card h3{font-size:19px;font-weight:700;margin-bottom:8px}
.hub-card p{color:var(--muted);font-size:14px;margin-bottom:14px}
.hub-card-count{display:inline-block;background:rgba(79,70,229,.1);color:var(--primary);padding:4px 12px;border-radius:12px;font-size:13px;font-weight:600}
.hot-section{padding:54px 0}
.hot-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(330px,1fr));gap:12px;list-style:none}
.hot-list li a{display:block;background:#fff;border:1px solid var(--border);padding:14px 18px;border-radius:11px;font-weight:500;color:#334155;transition:all .2s}
.hot-list li a:hover{border-color:var(--primary);color:var(--primary-d);transform:translateX(5px);box-shadow:var(--shadow-sm)}
.why-section{padding:54px 0;background:#fff}
.why-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:22px}
.why-card{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-lg);padding:30px;text-align:center;transition:transform .25s,box-shadow .25s,border-color .25s}
.why-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:var(--primary)}
.why-icon{font-size:40px;margin-bottom:12px;display:inline-block;transition:transform .3s}
.why-card:hover .why-icon{transform:scale(1.12)}
.why-card h3{font-size:18px;margin-bottom:8px}
.why-card p{color:var(--muted);font-size:14px}
.page-container{padding:30px 0 0}
.breadcrumb{font-size:13.5px;color:var(--muted);margin-bottom:22px}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px}
.breadcrumb li::after{content:"›";margin:0 6px;color:#cbd5e1}
.breadcrumb li:last-child::after{content:""}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--primary-d)}
.article{background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);padding:40px 46px;box-shadow:var(--shadow-sm);border-left:4px solid var(--primary)}
.article-h1{font-size:32px;font-weight:800;line-height:1.3;margin-bottom:16px;letter-spacing:-.3px;color:var(--text)}
.article-meta{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:13px;color:var(--muted);padding-bottom:20px;border-bottom:1px solid var(--border);margin-bottom:24px}
.meta-cat{background:rgba(79,70,229,.1);color:var(--primary-d);padding:3px 11px;border-radius:999px;font-weight:600}
.meta-dot{color:#cbd5e1}
.article-lead{font-size:17px;color:#475569;margin-bottom:30px;padding:18px 22px;background:#faf5ff;border-left:4px solid var(--accent);border-radius:0 12px 12px 0;line-height:1.85}
.article-h2{font-size:24px;font-weight:700;margin:36px 0 14px;padding-top:4px;letter-spacing:-.2px;color:var(--text);position:relative;padding-left:16px}
.article-h2::before{content:"";position:absolute;left:0;top:8px;width:5px;height:22px;background:var(--grad);border-radius:3px}
.section-body p{margin-bottom:14px;color:#374151}
.section-body ul{margin:0 0 14px 22px}
.section-body li{margin-bottom:6px}
.section-body strong{color:var(--primary-d)}
.inline-cta{color:var(--primary-d);font-weight:600;border-bottom:1px dashed var(--primary)}
.step-block{background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:20px 22px;margin:20px 0}
.step-num{font-size:18px;font-weight:700;color:var(--primary-d);margin-bottom:8px}
.author-card{display:flex;gap:16px;align-items:center;background:var(--bg);border-radius:12px;padding:20px;margin:32px 0;border:1px solid var(--border)}
.author-card img{width:64px;height:64px;border-radius:50%;background:#fff;flex-shrink:0}
.author-name{font-weight:700;font-size:16px}
.author-title{color:var(--primary-d);font-size:13px;margin-bottom:4px}
.author-bio{color:var(--muted);font-size:13.5px}
.faq-section{margin-top:38px}
.faq-item{border:1px solid var(--border);border-radius:11px;margin-bottom:12px;background:#fff;transition:box-shadow .2s,border-color .2s;overflow:hidden}
.faq-item[open]{box-shadow:var(--shadow-sm);border-color:var(--primary)}
.faq-item summary{list-style:none;cursor:pointer;padding:15px 18px;font-weight:600;font-size:15px;color:var(--text);display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-toggle{font-size:20px;color:var(--primary);font-weight:700;transition:transform .25s;flex-shrink:0}
.faq-item[open] .faq-toggle{transform:rotate(45deg)}
.faq-a{padding:0 18px 16px;color:var(--muted);font-size:14.5px;line-height:1.75}
.faq-a p{margin:0}
.article-cta{margin-top:34px;background:linear-gradient(135deg,#faf5ff,#eef2ff);border:1px solid #ddd6fe;border-radius:14px;padding:26px 28px}
.related-section{margin-top:30px}
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}
.related-card{display:flex;justify-content:space-between;align-items:center;background:#fff;border:1px solid var(--border);border-radius:11px;padding:14px 18px;font-weight:500;color:#334155;transition:all .2s}
.related-card:hover{border-color:var(--primary);color:var(--primary-d);transform:translateX(5px);box-shadow:var(--shadow-sm)}
.related-arrow{color:var(--primary);transition:transform .2s}
.related-card:hover .related-arrow{transform:translateX(3px)}
.legal-article{background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);padding:40px 46px;box-shadow:var(--shadow-sm);border-left:4px solid var(--primary);line-height:1.9}
.legal-article h1{font-size:30px;margin-bottom:20px;font-weight:800}
.legal-article h2{font-size:22px;margin:28px 0 12px;color:var(--primary-d);padding-left:16px;position:relative}
.legal-article h2::before{content:"";position:absolute;left:0;top:7px;width:5px;height:20px;background:var(--grad);border-radius:3px}
.legal-article p{margin-bottom:14px;color:#374151}
.site-footer{background:#1e293b;color:#cbd5e1;margin-top:64px;padding:50px 0 0}
.footer-grid{display:grid;grid-template-columns:1.2fr repeat(4,1fr) .8fr;gap:28px;margin-bottom:36px}
.footer-brand h4{color:#fff;font-size:17px;margin-bottom:12px}
.footer-brand p{color:#94a3b8;font-size:13px;margin-bottom:12px;line-height:1.75}
.footer-download a{color:#a78bfa;font-weight:600}
.footer-download a:hover{color:#fff}
.footer-col h4{color:#fff;font-size:13px;font-weight:700;margin-bottom:14px;text-transform:uppercase;letter-spacing:.5px}
.footer-col ul{list-style:none}
.footer-col li{margin-bottom:9px}
.footer-col a{color:#94a3b8;font-size:13px}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid #334155;padding:18px 0}
.footer-bottom-inner{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:12px;color:#64748b}
.footer-legal{color:#475569}
.reveal{opacity:0;transform:translateY(26px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:translateY(0)}
@media(max-width:880px){
  .download-hero-inner{grid-template-columns:1fr}
  .hero-text h1{font-size:30px}
  .footer-grid{grid-template-columns:1fr 1fr}
  .article,.legal-article{padding:28px 22px}
  .article-h1{font-size:25px}
  .nav-toggle{display:flex}
  .main-nav{display:none;position:absolute;top:72px;left:0;right:0;background:#fff;flex-direction:column;padding:14px 24px;border-bottom:1px solid var(--border);box-shadow:var(--shadow-md);gap:6px;align-items:stretch}
  .main-nav.open{display:flex}
  .main-nav .nav-link{width:100%;padding:11px 8px}
  .main-nav .nav-link::after{display:none}
  .main-nav .nav-cta{text-align:center;margin-top:6px}
}
@media(max-width:520px){
  .footer-grid{grid-template-columns:1fr}
  .section-title{font-size:23px}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
}