:root{
  --ink:#11151C; --ink-soft:#4B5565; --ink-faint:#8A93A3;
  --paper:#F7F8FA; --paper-alt:#EEF1F5; --line:#DDE3EC; --grid-line:rgba(27,42,74,.05);
  --white:#FFFFFF;
  --blueprint:#2451B5; --blueprint-dark:#1B3A8C; --blueprint-tint:#EAF0FB;
  --signal:#E8590C; --signal-tint:#FDEEE4;
  --efficient:#0F9D6E; --efficient-tint:#E7F6EF;
  --radius:12px; --radius-sm:8px;
  --shadow:0 1px 2px rgba(17,21,28,.04), 0 12px 28px -12px rgba(17,21,28,.10);
  --container:1180px; --article:700px;
  --ease:cubic-bezier(.4,0,.2,1);
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  font-family:'Inter',system-ui,-apple-system,sans-serif;
  color:var(--ink); background-color:var(--paper);
  background-image:linear-gradient(var(--grid-line) 1px, transparent 1px),linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size:56px 56px; -webkit-font-smoothing:antialiased; line-height:1.5;
}
h1,h2,h3,h4{font-family:'Space Grotesk',sans-serif;color:var(--ink);font-weight:700;letter-spacing:-0.01em;line-height:1.18;}
a{color:inherit;text-decoration:none;}
img,svg{display:block;max-width:100%;}
.container{max-width:var(--container);margin:0 auto;padding:0 28px;}
.mono{font-family:'JetBrains Mono',monospace;}
.eyebrow{font-family:'JetBrains Mono',monospace;font-size:12.5px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--blueprint);display:inline-flex;align-items:center;gap:8px;margin-bottom:16px;}
.eyebrow::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--blueprint);display:inline-block;}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 24px;border-radius:9px;font-weight:600;font-size:15px;transition:transform .2s var(--ease), box-shadow .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);white-space:nowrap;}
.btn-primary{background:var(--ink);color:var(--white);}
.btn-primary:hover{background:var(--blueprint-dark);transform:translateY(-1px);box-shadow:0 10px 22px -8px rgba(36,81,181,.45);}
.btn-ghost{background:transparent;color:var(--ink);border:1.5px solid var(--line);}
.btn-ghost:hover{border-color:var(--ink);transform:translateY(-1px);}
.btn-sm{padding:10px 18px;font-size:14px;}

/* header / nav */
header{position:sticky;top:0;z-index:50;background:rgba(247,248,250,.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);}
.nav{display:flex;align-items:center;justify-content:space-between;height:76px;}
.brand{display:flex;align-items:center;gap:10px;}
.brand .mark{width:30px;height:30px;color:var(--blueprint);flex-shrink:0;}
.brand-text{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:18.5px;display:flex;align-items:baseline;gap:6px;}
.brand-text .g{font-weight:500;color:var(--ink-soft);font-size:15px;}
.nav-links{display:flex;align-items:center;gap:32px;}
.nav-links a{font-size:14.5px;font-weight:500;color:var(--ink-soft);transition:color .2s var(--ease);}
.nav-links a.active{color:var(--ink);}
.nav-links a:hover{color:var(--ink);}
.nav-toggle{display:none;flex-direction:column;gap:5px;width:26px;}
.nav-toggle span{height:2px;width:100%;background:var(--ink);border-radius:2px;}
@media (max-width:900px){
  .nav-links{position:fixed;top:76px;left:0;right:0;background:var(--white);border-bottom:1px solid var(--line);flex-direction:column;align-items:flex-start;gap:0;padding:8px 28px 18px;transform:translateY(-12px);opacity:0;pointer-events:none;transition:opacity .2s var(--ease), transform .2s var(--ease);}
  .nav-links.open{opacity:1;transform:translateY(0);pointer-events:auto;}
  .nav-links a{padding:13px 0;width:100%;border-bottom:1px solid var(--paper-alt);}
  .nav-cta .btn-ghost{display:none;}
  .nav-toggle{display:flex;}
}

/* page-level */
.page-head{padding:64px 0 48px;}
.breadcrumb{font-family:'JetBrains Mono',monospace;font-size:12px;color:var(--ink-faint);margin-bottom:20px;display:flex;gap:6px;flex-wrap:wrap;}
.breadcrumb a{color:var(--blueprint);}
section{padding:0 0 96px;}
.reveal{opacity:0;transform:translateY(16px);transition:opacity .6s var(--ease), transform .6s var(--ease);}
.reveal.in{opacity:1;transform:translateY(0);}
@media (prefers-reduced-motion: reduce){*{transition:none!important;}.reveal{opacity:1;transform:none;}}

/* blog index cards */
.post-grid{display:grid;grid-template-columns:1fr;gap:20px;max-width:var(--article);margin:0 auto;}
.post-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:28px 30px;display:block;transition:border-color .2s var(--ease), transform .2s var(--ease), box-shadow .2s var(--ease);}
.post-card:hover{border-color:var(--blueprint);transform:translateY(-2px);box-shadow:var(--shadow);}
.post-meta{display:flex;gap:10px;align-items:center;margin-bottom:14px;}
.post-tag{font-family:'JetBrains Mono',monospace;font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--blueprint);background:var(--blueprint-tint);padding:4px 9px;border-radius:5px;}
.post-meta .dot{color:var(--ink-faint);}
.post-meta .when{font-family:'JetBrains Mono',monospace;font-size:11.5px;color:var(--ink-faint);}
.post-card h2{font-size:22px;margin-bottom:10px;}
.post-card p{font-size:15px;color:var(--ink-soft);}

/* article body */
.article-wrap{max-width:var(--article);margin:0 auto;}
.article-head .eyebrow{margin-bottom:18px;}
.article-head h1{font-size:clamp(30px,4.4vw,46px);margin-bottom:18px;}
.byline{display:flex;align-items:center;gap:10px;font-family:'JetBrains Mono',monospace;font-size:12.5px;color:var(--ink-faint);margin-bottom:36px;flex-wrap:wrap;}
.byline .dot{width:4px;height:4px;border-radius:50%;background:var(--ink-faint);}
article p{font-size:17px;line-height:1.78;color:var(--ink-soft);margin-bottom:22px;}
article h2{font-size:clamp(23px,2.8vw,29px);margin:52px 0 18px;}
article h3{font-size:19px;margin:34px 0 12px;}
article ul,article ol{margin:0 0 22px 22px;color:var(--ink-soft);font-size:16.5px;line-height:1.7;}
article li{margin-bottom:9px;}
article strong{color:var(--ink);}
article blockquote{border-left:3px solid var(--blueprint);padding:2px 0 2px 22px;margin:36px 0;font-family:'Space Grotesk',sans-serif;font-size:19px;font-weight:500;color:var(--ink);}

.takeaway-box{background:var(--blueprint-tint);border-left:3px solid var(--blueprint);border-radius:0 var(--radius-sm) var(--radius-sm) 0;padding:24px 26px;margin:8px 0 40px;}
.takeaway-box .tk-label{font-family:'JetBrains Mono',monospace;font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--blueprint-dark);margin-bottom:12px;}
.takeaway-box ul{margin:0;color:var(--ink);font-size:15.5px;}
.takeaway-box li{margin-bottom:8px;}

.stat-callout{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;margin:40px 0;}
.stat-callout div{background:var(--white);padding:22px 18px;text-align:center;}
.stat-callout .n{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:25px;color:var(--blueprint);display:block;margin-bottom:6px;}
.stat-callout .l{font-family:'JetBrains Mono',monospace;font-size:11px;color:var(--ink-faint);}

.faq-item{border-top:1px solid var(--line);padding:18px 0;}
.faq-item:last-child{border-bottom:1px solid var(--line);}
.faq-item summary{cursor:pointer;font-weight:600;font-size:15.5px;color:var(--ink);list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px;}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{content:"+";font-family:'JetBrains Mono',monospace;color:var(--ink-faint);font-size:18px;flex-shrink:0;}
.faq-item[open] summary::after{content:"–";}
.faq-item p{margin-top:12px;margin-bottom:0;font-size:15.5px;}

.related-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:20px;}
@media (max-width:640px){.related-grid{grid-template-columns:1fr;}}

.cta-strip{background:linear-gradient(135deg,var(--blueprint-dark),var(--blueprint));color:var(--white);border-radius:18px;padding:44px 38px;margin:56px 0 8px;}
.cta-strip h3{color:var(--white);font-size:23px;margin-bottom:10px;}
.cta-strip p{color:#D8E2F7;font-size:15.5px;margin-bottom:22px;}
.cta-strip .btn-primary{background:var(--white);color:var(--ink);}
.cta-strip .btn-primary:hover{background:#F2F5FB;}

footer{background:var(--ink);color:#B8C0CE;padding:56px 0 28px;margin-top:40px;}
.footer-top{display:flex;justify-content:space-between;align-items:flex-start;padding-bottom:32px;border-bottom:1px solid #262C39;flex-wrap:wrap;gap:24px;}
.footer-brand .mark{color:#8FB0EE;}
.footer-brand .brand-text{color:var(--white);}
.footer-brand .g{color:#8A93A3;}
.footer-links{display:flex;gap:28px;flex-wrap:wrap;}
.footer-links a{font-size:14px;color:#D6DBE3;}
.footer-links a:hover{color:var(--white);}
.footer-bottom{display:flex;justify-content:space-between;padding-top:22px;font-size:13px;color:#6B7384;flex-wrap:wrap;gap:10px;}

@media (max-width:640px){
  .page-head{padding:44px 0 32px;}
  section{padding-bottom:64px;}
  .post-card{padding:22px 20px;}
  article p{font-size:16px;}
}