:root{
  --bg:#05080B; --bg-2:#070C11; --text:#F5F8F9;
  --dim:rgba(245,248,249,.66); --dim-2:rgba(245,248,249,.44);
  --glass:rgba(255,255,255,.05); --glass-brd:rgba(255,255,255,.14);
  --accent:#48A6FF; --red:#FF4D4D; --cyan:#5EC8FF;
  --font:'Inter',sans-serif; --mono:'Space Mono',monospace; --display:'Bricolage Grotesque',sans-serif;
  --read:720px; --gut:clamp(20px,5vw,48px);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font); background:var(--bg); color:var(--text); line-height:1.7; -webkit-font-smoothing:antialiased; overflow-x:hidden;
  background-image:radial-gradient(120% 60% at 50% -10%, rgba(30,60,90,.35), transparent 60%);
  background-attachment:fixed;}
a{color:inherit; text-decoration:none}
img{max-width:100%; height:auto; display:block}

/* NAV */
.b-nav-shell{position:sticky; top:0; z-index:50; display:flex; justify-content:center; padding:16px var(--gut); pointer-events:none}
.b-nav{pointer-events:auto; display:flex; align-items:center; gap:6px; padding:7px 7px 7px 18px; border:1px solid rgba(255,255,255,.18); border-radius:100px;
  background:rgba(8,14,18,.72); backdrop-filter:blur(20px) saturate(160%); -webkit-backdrop-filter:blur(20px) saturate(160%);
  box-shadow:0 8px 30px rgba(0,0,0,.35), inset 0 1px 0 rgba(255,255,255,.22)}
.b-nav .b-brand{font-weight:500; font-size:14px; padding-right:6px; white-space:nowrap}
.b-nav a.b-link{font-size:13px; color:var(--dim); padding:8px 13px; border-radius:100px; transition:color .25s, background .25s}
.b-nav a.b-link:hover{color:var(--text); background:rgba(255,255,255,.06)}
.b-nav a.b-cta{font-size:13px; font-weight:500; color:var(--text); padding:9px 17px; border-radius:100px; white-space:nowrap;
  background:rgba(255,255,255,.12); border:1px solid rgba(255,255,255,.26); transition:background .25s, transform .2s}
.b-nav a.b-cta:hover{background:rgba(255,255,255,.2); transform:translateY(-1px)}

.wrap{max-width:var(--read); margin-inline:auto; padding-inline:var(--gut)}
.wide{max-width:1160px; margin-inline:auto; padding-inline:var(--gut)}

/* breadcrumb */
.crumb{font-family:var(--mono); font-size:11.5px; letter-spacing:.03em; color:var(--dim-2); display:flex; flex-wrap:wrap; gap:8px; align-items:center; margin-bottom:26px}
.crumb a{color:var(--dim-2); transition:color .2s} .crumb a:hover{color:var(--cyan)}
.crumb span.sep{opacity:.5}

/* hero */
.b-hero{padding:clamp(40px,7vh,80px) 0 clamp(28px,4vh,44px)}
.eyebrow{font-family:var(--mono); font-size:12px; letter-spacing:.14em; text-transform:uppercase; color:var(--cyan); display:inline-flex; align-items:center; gap:11px; margin-bottom:22px}
.eyebrow::before{content:""; width:22px; height:1px; background:var(--cyan)}
h1{font-family:var(--display); font-weight:700; letter-spacing:-.025em; line-height:1.08; font-size:clamp(1.9rem,4.6vw,3rem)}
.b-hero h1{max-width:20ch}
.meta-row{display:flex; flex-wrap:wrap; gap:10px 22px; margin-top:22px; font-family:var(--mono); font-size:12px; color:var(--dim)}
.meta-row .k{color:var(--cyan)}

/* article body */
.lead{font-size:1.16rem; color:var(--text); font-weight:300; line-height:1.6; margin:0 0 26px}
article p{margin:0 0 20px; color:var(--dim)}
article h2{font-family:var(--display); font-weight:600; letter-spacing:-.02em; font-size:clamp(1.4rem,3vw,1.85rem); line-height:1.15; margin:46px 0 18px; scroll-margin-top:90px}
article h3{font-weight:600; font-size:1.18rem; letter-spacing:-.01em; margin:32px 0 12px; color:var(--text)}
article ul{list-style:none; margin:0 0 22px; padding:0; display:flex; flex-direction:column; gap:10px}
article ul li{position:relative; padding-left:22px; color:var(--dim)}
article ul li::before{content:""; position:absolute; left:2px; top:11px; width:6px; height:6px; border-radius:50%; background:var(--cyan); opacity:.6}
article a.inl{color:var(--cyan); border-bottom:1px solid rgba(94,200,255,.3); transition:border-color .2s} article a.inl:hover{border-color:var(--cyan)}

/* TOC */
.toc{border:1px solid var(--glass-brd); border-radius:16px; background:var(--glass); backdrop-filter:blur(8px); padding:22px 24px; margin:30px 0 8px}
.toc .toc-t{font-family:var(--mono); font-size:11px; letter-spacing:.1em; text-transform:uppercase; color:var(--cyan); margin-bottom:14px}
.toc ol{list-style:none; counter-reset:t; display:flex; flex-direction:column; gap:9px}
.toc li{counter-increment:t}
.toc a{color:var(--dim); font-size:14.5px; display:flex; gap:12px; transition:color .2s}
.toc a::before{content:counter(t,decimal-leading-zero); font-family:var(--mono); font-size:11px; color:var(--dim-2)}
.toc a:hover{color:var(--text)}

/* FAQ */
.faq{margin:44px 0 0}
.faq details{border:1px solid var(--glass-brd); border-radius:14px; background:var(--glass); margin-bottom:12px; overflow:hidden}
.faq summary{cursor:pointer; list-style:none; padding:18px 22px; font-weight:500; font-size:1.02rem; display:flex; justify-content:space-between; align-items:center; gap:16px; transition:color .2s}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+"; font-family:var(--mono); color:var(--cyan); font-size:1.2rem; transition:transform .3s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq summary:hover{color:var(--cyan)}
.faq .ans{padding:0 22px 20px; color:var(--dim)}

/* callouts */
.sources, .author-box, .cta-box, .related{margin-top:46px}
.blk-label{font-family:var(--mono); font-size:11px; letter-spacing:.1em; text-transform:uppercase; color:var(--cyan); margin-bottom:16px; display:flex; align-items:center; gap:10px}
.blk-label::before{content:""; width:20px; height:1px; background:var(--cyan)}
.sources ul{list-style:none; display:flex; flex-direction:column; gap:8px}
.sources li{font-size:14px; color:var(--dim); padding-left:18px; position:relative}
.sources li::before{content:"›"; position:absolute; left:0; color:var(--dim-2)}
.sources a{color:var(--cyan)}

.author-box{border:1px solid var(--glass-brd); border-radius:18px; background:var(--glass); backdrop-filter:blur(8px); padding:26px}
.author-box .an{font-family:var(--display); font-weight:600; font-size:1.15rem}
.author-box p{margin:10px 0 0; font-size:14px; color:var(--dim); line-height:1.65}
.author-box a{color:var(--cyan); border-bottom:1px solid rgba(94,200,255,.3)}

.cta-box{border:1px solid rgba(120,200,255,.28); border-radius:20px; padding:clamp(26px,4vw,38px); text-align:center;
  background:radial-gradient(120% 120% at 50% 0%, rgba(72,166,255,.10), rgba(255,255,255,.03))}
.cta-box h2{font-family:var(--display); font-weight:600; font-size:clamp(1.3rem,2.6vw,1.7rem); margin:0 0 20px; letter-spacing:-.02em}
.btn{display:inline-flex; align-items:center; gap:10px; font-size:15px; font-weight:500; color:#08131e; background:var(--cyan);
  padding:14px 26px; border-radius:100px; transition:transform .2s, box-shadow .25s}
.btn:hover{transform:translateY(-2px); box-shadow:0 14px 36px rgba(94,200,255,.28)}

.related .rel-grid{display:grid; grid-template-columns:repeat(2,1fr); gap:14px}
.rel-card{border:1px solid var(--glass-brd); border-radius:14px; background:var(--glass); padding:20px; transition:border-color .25s, transform .25s, background .25s}
.rel-card:hover{border-color:rgba(120,200,255,.4); transform:translateY(-2px); background:rgba(255,255,255,.06)}
.rel-card .rc-cat{font-family:var(--mono); font-size:10.5px; letter-spacing:.06em; text-transform:uppercase; color:var(--cyan)}
.rel-card .rc-t{margin-top:9px; font-weight:500; font-size:15px; line-height:1.35; letter-spacing:-.01em}

.back-blog{display:inline-flex; align-items:center; gap:9px; margin-top:44px; font-family:var(--mono); font-size:13px; color:var(--dim); transition:color .2s, gap .2s}
.back-blog:hover{color:var(--cyan); gap:12px}

.val-flag{margin:20px 0; font-family:var(--mono); font-size:12px; color:#ffd7a0; border:1px dashed rgba(255,180,90,.4); border-radius:10px; padding:11px 15px; background:rgba(255,170,70,.05)}

footer.b-foot{border-top:1px solid rgba(255,255,255,.07); margin-top:clamp(60px,10vh,110px); padding:34px 0}
footer.b-foot .fi{display:flex; justify-content:space-between; gap:16px; flex-wrap:wrap; font-family:var(--mono); font-size:12px; color:var(--dim-2)}
footer.b-foot a{color:var(--dim-2); transition:color .2s} footer.b-foot a:hover{color:var(--cyan)}

/* INDEX page */
.idx-hero{padding:clamp(60px,11vh,130px) 0 clamp(30px,5vh,60px)}
.idx-hero h1{font-size:clamp(2.1rem,5.2vw,3.4rem); max-width:16ch}
.idx-hero .lead{margin-top:24px; max-width:60ch}
.cat-sec{margin-top:clamp(48px,7vh,80px)}
.cat-head{display:flex; align-items:baseline; gap:14px; margin-bottom:26px; flex-wrap:wrap}
.cat-head .num{font-family:var(--mono); font-size:12px; color:var(--cyan)}
.cat-head h2{font-family:var(--display); font-weight:600; font-size:clamp(1.4rem,3vw,2rem); letter-spacing:-.02em}
.card-grid{display:grid; grid-template-columns:repeat(auto-fill,minmax(320px,1fr)); gap:18px}
.a-card{display:flex; flex-direction:column; border:1px solid var(--glass-brd); border-radius:18px; background:var(--glass); backdrop-filter:blur(8px); padding:26px; transition:border-color .3s, transform .3s, background .3s}
.a-card:hover{border-color:rgba(120,200,255,.42); transform:translateY(-3px); background:rgba(255,255,255,.06)}
.a-card .ac-cat{font-family:var(--mono); font-size:11px; letter-spacing:.06em; text-transform:uppercase; color:var(--cyan)}
.a-card .ac-t{margin-top:12px; font-family:var(--display); font-weight:600; font-size:1.22rem; line-height:1.25; letter-spacing:-.01em}
.a-card .ac-ex{margin-top:12px; font-size:14px; color:var(--dim); line-height:1.6; flex:1}
.a-card .ac-foot{margin-top:20px; display:flex; justify-content:space-between; align-items:center; font-family:var(--mono); font-size:11.5px; color:var(--dim-2)}
.a-card .ac-foot .arw{transition:transform .25s} .a-card:hover .ac-foot .arw{transform:translateX(4px); color:var(--cyan)}

@media(max-width:640px){
  .rel-grid, .card-grid{grid-template-columns:1fr}
  .b-nav .b-link{display:none}
}
@media (prefers-reduced-motion: reduce){ *{scroll-behavior:auto} .a-card:hover,.rel-card:hover,.btn:hover{transform:none} }
:focus-visible{outline:2px solid var(--cyan); outline-offset:3px; border-radius:6px}