/* N+1 article design system - matches the main site, tuned for long-form reading */
:root{
  --void:#080B10;--void-2:#0A0F16;--panel:#0E141C;--panel-2:#111926;
  --line:#1C2733;--line-bright:#2A3948;--ink:#E9EFF5;--muted:#8393A2;--muted-dim:#5C6A78;
  --signal:#22D3BE;--copper:#F0913E;--ok:#3FB950;--read:70ch;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--void);color:var(--ink);font-family:"IBM Plex Sans",system-ui,sans-serif;font-size:18px;line-height:1.7;-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;background:radial-gradient(900px 500px at 82% -10%,rgba(34,211,190,.07),transparent 60%),radial-gradient(700px 460px at 3% 2%,rgba(240,145,62,.04),transparent 55%)}
a{color:var(--signal);text-decoration:none}
a:hover{text-decoration:underline}
.mono{font-family:"IBM Plex Mono",monospace}
h1,h2,h3,h4{font-family:"Space Grotesk",sans-serif;font-weight:600;line-height:1.15;letter-spacing:-.02em;color:var(--ink)}

/* nav */
header{position:sticky;top:0;z-index:50;background:rgba(8,11,16,.75);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav{max-width:1120px;margin:0 auto;padding:0 24px;height:64px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:10px;font-family:"IBM Plex Mono",monospace;font-weight:500;font-size:18px}
.brand .mark{color:var(--void);background:var(--signal);padding:2px 8px;border-radius:5px;box-shadow:0 0 16px rgba(34,211,190,.35)}
.brand .sub{color:var(--muted-dim);font-size:11px;letter-spacing:.14em;text-transform:uppercase;border-left:1px solid var(--line);padding-left:10px}
.nav .navr{display:flex;gap:22px;align-items:center;font-family:"IBM Plex Sans"}
.nav .navr a{color:var(--muted);font-size:14px}
.nav .navr a:hover{color:var(--ink);text-decoration:none}
.nav .cta{background:var(--signal);color:#04120F;font-weight:600;padding:9px 16px;border-radius:7px;font-size:13.5px}
.nav .cta:hover{text-decoration:none;box-shadow:0 0 20px rgba(34,211,190,.4)}

/* article shell */
.shell{max-width:1120px;margin:0 auto;padding:0 24px}
.article{max-width:760px;margin:0 auto;padding:44px 0 60px}
.crumbs{font-family:"IBM Plex Mono",monospace;font-size:12px;color:var(--muted-dim);letter-spacing:.05em;margin-bottom:26px}
.crumbs a{color:var(--muted)}
.eyebrow{font-family:"IBM Plex Mono",monospace;font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--signal);display:inline-flex;align-items:center;gap:9px;margin-bottom:18px}
.eyebrow::before{content:"";width:6px;height:6px;background:var(--signal);border-radius:50%;box-shadow:0 0 10px var(--signal)}
.article h1{font-size:clamp(32px,5vw,50px);letter-spacing:-.03em;margin-bottom:20px}
.dek{font-size:21px;color:var(--muted);line-height:1.55;margin-bottom:28px}
.byline{display:flex;flex-wrap:wrap;gap:8px 18px;align-items:center;font-family:"IBM Plex Mono",monospace;font-size:12.5px;color:var(--muted-dim);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:16px 0;margin-bottom:8px}
.byline .who{color:var(--muted)}
.byline .dot{width:4px;height:4px;border-radius:50%;background:var(--muted-dim)}

/* TOC */
.toc{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:22px 26px;margin:32px 0}
.toc h2{font-size:13px;font-family:"IBM Plex Mono",monospace;letter-spacing:.14em;text-transform:uppercase;color:var(--muted-dim);margin-bottom:14px}
.toc ol{list-style:none;counter-reset:t;display:grid;gap:9px}
.toc li{counter-increment:t;font-size:15px}
.toc li a{color:var(--ink)}
.toc li a::before{content:counter(t,decimal-leading-zero);font-family:"IBM Plex Mono",monospace;color:var(--signal);font-size:12px;margin-right:12px}

/* prose */
.prose{font-size:18px}
.prose > p,.prose > ul,.prose > ol{margin:0 0 22px}
.prose h2{font-size:clamp(24px,3.4vw,32px);margin:52px 0 16px;padding-top:14px;scroll-margin-top:80px}
.prose h3{font-size:21px;margin:34px 0 12px;color:var(--ink)}
.prose h2 .num{font-family:"IBM Plex Mono",monospace;font-size:.5em;color:var(--signal);vertical-align:middle;margin-right:12px;letter-spacing:.05em}
.prose ul,.prose ol{padding-left:0;list-style:none}
.prose ul li,.prose ol li{position:relative;padding-left:26px;margin-bottom:11px}
.prose ul li::before{content:"+";position:absolute;left:0;color:var(--copper);font-family:"IBM Plex Mono",monospace;font-weight:500}
.prose ol{counter-reset:li}
.prose ol li{counter-increment:li}
.prose ol li::before{content:counter(li);position:absolute;left:0;color:var(--signal);font-family:"IBM Plex Mono",monospace;font-size:14px;top:2px}
.prose strong{color:var(--ink);font-weight:600}
.prose em{color:var(--muted);font-style:italic}

/* citations */
sup.ref{font-family:"IBM Plex Mono",monospace;font-size:11px;color:var(--signal);font-weight:500;padding:0 1px}
sup.ref a{color:var(--signal);text-decoration:none}
sup.ref a:hover{text-decoration:underline}

/* callouts */
.callout{border:1px solid var(--line-bright);border-left:3px solid var(--signal);background:var(--panel);border-radius:0 10px 10px 0;padding:22px 26px;margin:30px 0}
.callout.copper{border-left-color:var(--copper)}
.callout .k{font-family:"IBM Plex Mono",monospace;font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--signal);display:block;margin-bottom:9px}
.callout.copper .k{color:var(--copper)}
.callout p{margin:0;font-size:16.5px;color:var(--ink)}
.callout p+p{margin-top:12px}

/* key-fact / definition block for AEO */
.keyfact{background:linear-gradient(120deg,var(--panel-2),var(--panel));border:1px solid var(--line-bright);border-radius:12px;padding:24px 28px;margin:30px 0}
.keyfact .q{font-family:"Space Grotesk";font-weight:600;font-size:18px;color:var(--ink);margin-bottom:10px}
.keyfact .a{font-size:16.5px;color:var(--muted)}
.keyfact .a strong{color:var(--signal);font-weight:600}

/* tables */
.tablewrap{overflow-x:auto;margin:28px 0;border:1px solid var(--line);border-radius:12px}
table{width:100%;border-collapse:collapse;font-size:15px;min-width:520px}
thead th{background:var(--panel-2);text-align:left;padding:14px 16px;font-family:"IBM Plex Mono",monospace;font-size:11.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);border-bottom:1px solid var(--line-bright)}
tbody td{padding:13px 16px;border-bottom:1px solid var(--line);color:var(--ink)}
tbody tr:last-child td{border-bottom:none}
tbody td:first-child{font-weight:500}
tbody td .n{font-family:"IBM Plex Mono",monospace;color:var(--signal)}
tbody tr:nth-child(even){background:rgba(255,255,255,.012)}

/* pull stat */
.statband{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:32px 0}
.statband .s{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:22px}
.statband .s .big{font-family:"Space Grotesk";font-weight:600;font-size:34px;letter-spacing:-.02em;line-height:1}
.statband .s .big .u{font-size:.5em;color:var(--muted)}
.statband .s .lab{font-size:13px;color:var(--muted);margin-top:10px;line-height:1.4}

/* FAQ */
.faq h2{font-size:clamp(24px,3.4vw,32px);margin:52px 0 8px}
.qa{border-bottom:1px solid var(--line);padding:20px 0}
.qa summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;gap:16px;align-items:center;font-family:"Space Grotesk";font-weight:500;font-size:18px;color:var(--ink)}
.qa summary::-webkit-details-marker{display:none}
.qa summary .p{font-family:"IBM Plex Mono";color:var(--signal);font-size:20px;transition:transform .2s}
.qa[open] summary .p{transform:rotate(45deg)}
.qa .ans{margin-top:12px;color:var(--muted);font-size:16.5px}

/* sources */
.sources{margin:48px 0 0;border-top:1px solid var(--line);padding-top:28px}
.sources h2{font-size:20px;margin-bottom:16px}
.sources ol{counter-reset:src;list-style:none}
.sources li{counter-increment:src;position:relative;padding-left:34px;margin-bottom:12px;font-size:14px;color:var(--muted);line-height:1.5}
.sources li::before{content:counter(src);position:absolute;left:0;top:0;font-family:"IBM Plex Mono";font-size:11px;color:var(--signal);border:1px solid var(--line-bright);border-radius:5px;width:22px;height:22px;display:flex;align-items:center;justify-content:center}
.sources li a{word-break:break-word}
.methods{font-size:13.5px;color:var(--muted-dim);font-style:italic;margin-top:20px;line-height:1.6}

/* related / CTA */
.cta-card{background:linear-gradient(120deg,rgba(34,211,190,.08),rgba(240,145,62,.05));border:1px solid var(--line-bright);border-radius:14px;padding:34px;margin:44px 0 0;text-align:center}
.cta-card h3{font-size:24px;margin-bottom:10px}
.cta-card p{color:var(--muted);margin-bottom:20px;font-size:16.5px}
.cta-card .btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:500;font-size:14.5px;padding:12px 22px;border-radius:8px;border:1px solid transparent}
.btn-primary{background:var(--signal);color:#04120F;font-weight:600}
.btn-primary:hover{text-decoration:none;box-shadow:0 0 24px rgba(34,211,190,.4)}
.btn-ghost{border-color:var(--line-bright);color:var(--ink)}
.btn-ghost:hover{text-decoration:none;border-color:var(--signal);color:var(--signal)}

.related{margin:44px 0 0}
.related h2{font-size:20px;margin-bottom:16px}
.related-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.rcard{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:20px 22px;transition:border-color .2s}
.rcard:hover{border-color:var(--signal);text-decoration:none}
.rcard .t{font-family:"IBM Plex Mono";font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted-dim)}
.rcard .h{font-family:"Space Grotesk";font-weight:600;font-size:17px;color:var(--ink);margin:8px 0 6px}
.rcard .d{font-size:14px;color:var(--muted)}

/* footer */
footer{border-top:1px solid var(--line);padding:44px 0 40px;margin-top:56px}
.foot{max-width:1120px;margin:0 auto;padding:0 24px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;font-family:"IBM Plex Mono";font-size:12px;color:var(--muted-dim)}
.foot a{color:var(--muted)}

/* hub */
.hub-hero{max-width:1120px;margin:0 auto;padding:56px 24px 20px}
.hub-hero h1{font-size:clamp(34px,5vw,52px);letter-spacing:-.03em;margin:16px 0 16px;max-width:800px}
.hub-hero p{font-size:20px;color:var(--muted);max-width:640px}
.hub-sec{max-width:1120px;margin:0 auto;padding:26px 24px}
.hub-sec h2{font-size:14px;font-family:"IBM Plex Mono";letter-spacing:.16em;text-transform:uppercase;color:var(--muted-dim);margin:24px 0 18px;border-top:1px solid var(--line);padding-top:26px}
.hub-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.hub-grid.two{grid-template-columns:1fr 1fr}
.hcard{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:26px;transition:all .22s;display:block}
.hcard:hover{border-color:var(--signal);transform:translateY(-3px);text-decoration:none}
.hcard.pillar{background:linear-gradient(135deg,var(--panel-2),var(--panel));border-color:var(--line-bright)}
.hcard .tag{font-family:"IBM Plex Mono";font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--signal)}
.hcard.soon{opacity:.55}
.hcard.soon .tag{color:var(--muted-dim)}
.hcard h3{font-size:21px;margin:12px 0 8px}
.hcard p{color:var(--muted);font-size:14.5px}
.hcard .meta{font-family:"IBM Plex Mono";font-size:11px;color:var(--muted-dim);margin-top:14px}

@media(max-width:820px){
  .hub-grid,.hub-grid.two,.related-grid,.statband{grid-template-columns:1fr 1fr}
  .nav .navr a:not(.cta){display:none}
}
@media(max-width:560px){
  body{font-size:17px}
  .hub-grid,.hub-grid.two,.related-grid,.statband{grid-template-columns:1fr}
  .brand .sub{display:none}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}
:focus-visible{outline:2px solid var(--signal);outline-offset:3px;border-radius:4px}