:root{
  --black:#000;--dark:#0A0A0A;--panel:#111;--line:#1F1F1F;
  --neutral:#E5E5E5;--muted:#8A8A8A;--neon:#FFFFFF;
  --font:'Sora',sans-serif;--mono:'JetBrains Mono',monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--black);color:var(--neutral);font-family:var(--font);font-weight:300;line-height:1.7;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
::selection{background:#E5E5E5;color:#000}
.bwrap{max-width:820px;margin:0 auto;padding:0 24px}
.hub-wrap,.bhub .bwrap{max-width:1120px}
/* nav */
.bnav{position:sticky;top:0;z-index:50;background:rgba(0,0,0,.82);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.bnav-in{display:flex;align-items:center;justify-content:space-between;height:64px;max-width:1120px}
.bnav-right{display:flex;align-items:center;gap:14px}
.blang{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.lang-b{font-family:var(--mono);font-size:.68rem;letter-spacing:.1em;padding:7px 11px;color:var(--muted);transition:all .2s}
.lang-b.on{background:var(--neon);color:#000;font-weight:600}
.bbtn{display:inline-flex;align-items:center;gap:8px;background:var(--neon);color:#000;font-weight:600;font-size:.8rem;padding:10px 18px;border-radius:9px;transition:transform .2s,box-shadow .2s;white-space:nowrap}
.bbtn:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(255,255,255,.2)}
.bbtn.big{font-size:.95rem;padding:15px 30px}
/* breadcrumb */
.crumb{font-family:var(--mono);font-size:.68rem;letter-spacing:.06em;color:var(--muted);margin:34px 0 20px;text-transform:uppercase;display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.crumb a:hover{color:#fff}
.crumb .cur{color:var(--neutral)}
/* article */
.art-head{padding:14px 0 8px;border-bottom:1px solid var(--line)}
.art-head h1{font-size:clamp(1.9rem,4.2vw,2.9rem);font-weight:700;line-height:1.14;letter-spacing:-.02em;color:#fff}
.art-meta{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:22px 0 4px;font-size:.82rem;color:var(--muted)}
.art-intro{font-size:1.12rem;color:#CFCFCF;margin:34px 0;font-weight:300}
.art-intro p{margin-bottom:16px}
.takeaways{border:1px solid var(--line);border-left:2px solid var(--neon);border-radius:12px;background:var(--dark);padding:24px 26px;margin:34px 0}
.takeaways b{display:block;font-family:var(--mono);font-size:.72rem;letter-spacing:.2em;text-transform:uppercase;color:#fff;margin-bottom:14px}
.takeaways ul{list-style:none;display:flex;flex-direction:column;gap:10px}
.takeaways li{position:relative;padding-left:22px;font-size:.96rem;color:var(--neutral)}
.takeaways li::before{content:'';position:absolute;left:0;top:.6em;width:6px;height:6px;border-radius:50%;background:var(--neon)}
.toc{border:1px solid var(--line);border-radius:12px;padding:22px 26px;margin:34px 0}
.toc b{display:block;font-family:var(--mono);font-size:.72rem;letter-spacing:.2em;text-transform:uppercase;color:var(--muted);margin-bottom:12px}
.toc ul{list-style:none;display:flex;flex-direction:column;gap:8px}
.toc a{color:var(--neutral);font-size:.94rem;border-bottom:1px solid transparent}
.toc a:hover{color:#fff;border-color:var(--line)}
.art-body{margin-top:20px}
.qa{padding:30px 0;border-top:1px solid var(--line)}
.qa h2{font-size:clamp(1.3rem,2.6vw,1.7rem);font-weight:600;color:#fff;line-height:1.25;letter-spacing:-.01em;margin-bottom:16px;scroll-margin-top:80px}
.qa p{margin-bottom:15px;color:#C6C6C6;font-size:1.02rem}
.qa ul,.qa ol{margin:0 0 16px 22px;color:#C6C6C6;font-size:1.02rem}
.qa li{margin-bottom:8px}
.qa strong,.qa b{color:#fff;font-weight:600}
.qa a{color:#fff;border-bottom:1px solid var(--muted)}
.qa a:hover{border-color:#fff}
/* cta */
.bcta{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--dark);margin-top:60px;position:relative;overflow:hidden}
.bcta::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse at 50% 130%,rgba(255,255,255,.06),transparent 60%)}
.bcta-in{text-align:center;padding:70px 24px;position:relative;z-index:2;max-width:640px}
.bcta h2{font-size:clamp(1.5rem,3vw,2.1rem);font-weight:700;color:#fff;margin-bottom:14px;letter-spacing:-.015em}
.bcta p{color:var(--muted);margin-bottom:30px;font-size:1.02rem}
/* related */
.brelated{padding:56px 24px 10px}
.brelated>b{display:block;font-family:var(--mono);font-size:.72rem;letter-spacing:.2em;text-transform:uppercase;color:var(--muted);margin-bottom:20px}
.rgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.rcard{border:1px solid var(--line);border-radius:12px;padding:22px;background:var(--dark);transition:border-color .3s,transform .3s}
.rcard:hover{border-color:rgba(255,255,255,.3);transform:translateY(-3px)}
.rcard .rk{font-family:var(--mono);font-size:.62rem;letter-spacing:.2em;text-transform:uppercase;color:var(--muted);display:block;margin-bottom:10px}
.rcard b{color:#fff;font-weight:600;font-size:.98rem;line-height:1.3}
/* hub */
.hub-head{padding:20px 0 10px;max-width:720px}
.hub-head .eyebrow{font-family:var(--mono);font-size:.72rem;letter-spacing:.24em;text-transform:uppercase;color:var(--muted)}
.hub-head h1{font-size:clamp(2.1rem,5vw,3.4rem);font-weight:700;color:#fff;line-height:1.1;letter-spacing:-.02em;margin:18px 0 20px}
.hub-head p{color:var(--muted);font-size:1.1rem;max-width:600px}
.hgrid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin:48px 0 20px}
.hcard{border:1px solid var(--line);border-radius:16px;padding:32px 30px;background:var(--dark);transition:border-color .3s,transform .3s;display:flex;flex-direction:column;gap:12px;position:relative;overflow:hidden}
.hcard::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;background:linear-gradient(90deg,transparent,rgba(255,255,255,.5),transparent);opacity:0;transition:opacity .3s}
.hcard:hover{border-color:rgba(255,255,255,.28);transform:translateY(-4px)}
.hcard:hover::before{opacity:1}
.hcard .hk{font-family:var(--mono);font-size:.64rem;letter-spacing:.2em;text-transform:uppercase;color:var(--muted)}
.hcard h2{font-size:1.28rem;font-weight:600;color:#fff;line-height:1.25;letter-spacing:-.01em}
.hcard p{color:var(--muted);font-size:.94rem;flex:1}
.hcard .hmore{color:#fff;font-size:1.2rem}
/* footer */
.bfoot{border-top:1px solid var(--line);background:var(--black);margin-top:0}
.bfoot-in{display:flex;flex-direction:column;align-items:center;gap:18px;padding:48px 24px;text-align:center}
.bfoot-links{display:flex;gap:24px;flex-wrap:wrap;justify-content:center}
.bfoot-links a{color:var(--muted);font-size:.86rem}
.bfoot-links a:hover{color:#fff}
.bfoot-c{font-family:var(--mono);font-size:.64rem;letter-spacing:.16em;text-transform:uppercase;color:#555}
@media(max-width:720px){
  .rgrid{grid-template-columns:1fr}
  .hgrid{grid-template-columns:1fr}
  .bbtn{padding:9px 14px;font-size:.74rem}
}