:root{
  --bg:#e8edf6;
  --paper:#fff;
  --ink:#1f2942;
  --soft:#5b6780;
  --line:rgba(31,41,66,.11);
  --accent:#4e86f5;
  --accent-deep:#315fd7;
  --dark:#111827;
  --font:"Avenir Next","SF Pro Display","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:100px}
body{
  margin:0;
  min-width:320px;
  color:var(--ink);
  background:linear-gradient(180deg,#f2f5fb 0%,var(--bg) 100%);
  font:16px/1.75 var(--font);
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
a:focus-visible{outline:3px solid rgba(78,134,245,.72);outline-offset:4px}
.site-head{
  position:sticky;
  top:0;
  z-index:20;
  display:flex;
  align-items:center;
  gap:28px;
  width:min(1180px,calc(100% - 48px));
  margin:0 auto;
  padding:16px 0;
  background:rgba(242,245,251,.86);
  border-bottom:1px solid rgba(255,255,255,.72);
  backdrop-filter:blur(18px);
  -webkit-backdrop-filter:blur(18px);
}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:820;white-space:nowrap}
.brand img{width:38px;height:38px;border-radius:50%;box-shadow:0 4px 12px rgba(39,92,178,.18)}
.site-head nav{display:flex;align-items:center;justify-content:flex-end;gap:5px;margin-left:auto;overflow-x:auto;scrollbar-width:none}
.site-head nav::-webkit-scrollbar{display:none}
.site-head nav a{padding:7px 12px;border-radius:999px;color:var(--soft);font-size:.82rem;font-weight:700;white-space:nowrap;transition:background .16s,color .16s}
.site-head nav a:hover{background:rgba(255,255,255,.82);color:var(--ink)}
.site-head nav .nav-download{padding:8px 17px;background:var(--ink);color:#fff}
.site-head nav .nav-download:hover{background:#11182a;color:#fff}
.page{width:min(1180px,calc(100% - 48px));margin:0 auto;padding:34px 0 96px}
.breadcrumbs{display:flex;align-items:center;gap:8px;margin:0 0 20px;color:var(--soft);font-size:.78rem;font-weight:680}
.breadcrumbs a:hover{color:var(--accent-deep)}
.breadcrumbs span[aria-hidden="true"]{opacity:.46}
.hero{
  display:grid;
  grid-template-columns:minmax(0,.92fr) minmax(420px,1.08fr);
  gap:54px;
  align-items:center;
  min-height:500px;
  padding:56px;
  overflow:hidden;
  border-radius:30px;
  background:
    radial-gradient(circle at 82% 16%,rgba(78,134,245,.28),transparent 38%),
    radial-gradient(circle at 18% 82%,rgba(124,90,244,.16),transparent 34%),
    var(--dark);
  box-shadow:0 28px 68px rgba(17,24,39,.18);
}
.hero-copy{position:relative;z-index:2}
.hero h1{max-width:12ch;margin:0;color:#fff;font-size:clamp(2.45rem,5vw,4.6rem);font-weight:850;line-height:1.04;letter-spacing:-.04em;text-wrap:balance}
.lead{max-width:60ch;margin:22px 0 0;color:rgba(255,255,255,.66);font-size:1.02rem;line-height:1.72}
.meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:24px}
.meta span{padding:6px 11px;border:1px solid rgba(255,255,255,.13);border-radius:999px;background:rgba(255,255,255,.08);color:rgba(255,255,255,.76);font-size:.74rem;font-weight:720}
.hero-actions{display:flex;align-items:center;gap:12px;margin-top:30px;flex-wrap:wrap}
.hero-download,.hero-secondary{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 19px;border-radius:999px;font-size:.84rem;font-weight:800;transition:transform .16s,background .16s}
.hero-download{background:#fff;color:var(--dark)}
.hero-download:hover{transform:translateY(-2px)}
.hero-secondary{border:1px solid rgba(255,255,255,.17);color:#fff;background:rgba(255,255,255,.06)}
.hero-secondary:hover{background:rgba(255,255,255,.12)}
.hero-media{position:relative;display:flex;flex-direction:column;justify-content:center;min-height:360px;margin:0;padding:10px;border-radius:22px;background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.15);box-shadow:0 26px 60px rgba(0,0,0,.28)}
.hero-media img{align-self:center;width:auto;max-width:100%;height:auto;max-height:410px;border-radius:16px;object-fit:contain;object-position:center;background:#fff}
.hero-media figcaption{padding:10px 6px 2px;color:rgba(255,255,255,.52);font-size:.72rem}
.article{display:grid;grid-template-columns:minmax(0,760px) minmax(240px,1fr);gap:76px;align-items:start;margin-top:72px}
.content{min-width:0;font-size:1.02rem}
.content h2{margin:58px 0 14px;font-size:clamp(1.55rem,2.4vw,2rem);line-height:1.24;letter-spacing:-.025em}
.content h2:first-child{margin-top:0}
.content h3{margin:30px 0 8px;font-size:1.08rem;line-height:1.4}
.content p,.content li{color:var(--soft)}
.content p{max-width:72ch;margin:0}
.content ul,.content ol{max-width:70ch;padding-left:1.35rem;color:var(--soft)}
.content li+li{margin-top:9px}
.answer{max-width:none!important;padding:24px 26px;border:1px solid rgba(255,255,255,.92);border-radius:20px;background:rgba(255,255,255,.62);box-shadow:0 12px 34px rgba(24,36,72,.06);color:var(--ink)!important;font-weight:650}
.aside{position:sticky;top:98px;align-self:start;padding:24px;border:1px solid rgba(255,255,255,.92);border-radius:22px;background:rgba(255,255,255,.50);box-shadow:0 14px 38px rgba(24,36,72,.07)}
.aside strong{display:block;margin-bottom:12px;font-size:.92rem}
.aside a{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:11px 0;border-bottom:1px solid var(--line);color:var(--soft);font-size:.84rem;font-weight:680}
.aside a::after{content:'→';color:var(--accent-deep)}
.aside a:hover{color:var(--ink)}
.aside .aside-download{justify-content:center;margin-top:18px;padding:11px 16px;border:0;border-radius:999px;background:var(--ink);color:#fff}
.aside .aside-download::after{display:none}
.cta{margin-top:62px;padding:34px 36px;border-radius:24px;background:var(--dark);color:#fff;box-shadow:0 22px 50px rgba(17,24,39,.14)}
.cta h2{margin:0;font-size:1.7rem;color:#fff}
.cta p{margin-top:10px;color:rgba(255,255,255,.64)}
.cta a{display:inline-flex;align-items:center;justify-content:center;min-height:44px;margin-top:18px;padding:0 20px;border-radius:999px;background:#fff;color:var(--dark);font-weight:800}
.site-foot{border-top:1px solid rgba(31,41,66,.09);padding:30px 24px;color:var(--soft);font-size:.8rem}
.site-foot>div{width:min(1180px,100%);margin:auto;display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}
.site-foot nav{display:flex;gap:16px}
.site-foot a:hover{color:var(--ink)}
@media(max-width:940px){
  .hero{grid-template-columns:1fr;gap:38px;padding:44px}
  .hero h1{max-width:15ch}
  .hero-media img{max-height:500px}
  .article{grid-template-columns:1fr;gap:38px}
  .aside{position:static;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 20px;order:-1}
  .aside strong{grid-column:1/-1}
  .aside .aside-download{grid-column:1/-1}
}
@media(max-width:640px){
  html{scroll-padding-top:132px}
  .site-head{width:calc(100% - 28px);flex-wrap:wrap;gap:10px;padding:11px 0}
  .site-head nav{width:100%;justify-content:flex-start;margin:0}
  .site-head nav a{padding:6px 10px}
  .page{width:calc(100% - 28px);padding-top:24px}
  .hero{min-height:0;padding:34px 24px;border-radius:24px}
  .hero h1{font-size:2.35rem}
  .hero-actions{align-items:stretch}
  .hero-download,.hero-secondary{flex:1 1 100%}
  .hero-media{min-height:0;padding:7px;border-radius:18px}
  .hero-media img{border-radius:13px}
  .article{margin-top:48px}
  .content{font-size:.98rem}
  .content h2{margin-top:46px}
  .aside{grid-template-columns:1fr;padding:20px}
  .aside strong,.aside .aside-download{grid-column:auto}
  .cta{padding:28px 24px;border-radius:20px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
}