:root{
  --ink:#0B1220;
  --registry-blue:#1D5CE0;
  --paper:#FFFFFF;
  --barcode-black:#0B1220;
  --signal-amber:#1D5CE0;
  --hairline:#E5E9F0;
  --ink-soft:#5B6472;
  --panel-tint:#F7F9FC;
  --success:#16A34A;
  --danger:#DC2626;
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{
  background:var(--paper);color:var(--ink);
  font-family:'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  line-height:1.6;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none;}
.wrap{max-width:1100px;margin:0 auto;padding:0 28px;}
.mono{font-family:'IBM Plex Mono', monospace;}
.serif{font-family:'Inter', sans-serif;}

/* Header */
header{border-bottom:1px solid var(--hairline);position:sticky;top:0;background:var(--paper);z-index:50;}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:16px 28px;position:relative;}
.logo{font-family:'Inter', sans-serif;font-weight:700;font-size:19px;letter-spacing:-0.2px;}
.logo .r{color:var(--registry-blue);}
nav{display:flex;gap:32px;align-items:center;}
nav a{font-size:14.5px;font-weight:500;color:var(--ink-soft);transition:color .15s;}
nav a:hover{color:var(--registry-blue);}
.nav-cta{background:var(--registry-blue);color:#fff!important;padding:9px 18px;border-radius:6px;font-size:13.5px;font-weight:600;}
.nav-cta:hover{background:#1547B8;}

/* Mobile hamburger (checkbox toggle, no JS) */
.menu-toggle{display:none;}
.hamburger{display:none;flex-direction:column;gap:4px;cursor:pointer;padding:6px;}
.hamburger span{width:20px;height:2px;background:var(--ink);display:block;border-radius:2px;}

/* Breadcrumb + article head */
.breadcrumb{font-family:'IBM Plex Mono', monospace;font-size:12.5px;color:var(--ink-soft);padding:20px 0 0;}
.breadcrumb a{color:var(--registry-blue);}
.article-head{padding:20px 0 40px;max-width:760px;}
.eyebrow{font-family:'Inter', sans-serif;font-size:12.5px;font-weight:700;letter-spacing:0.5px;text-transform:uppercase;color:var(--registry-blue);margin-bottom:16px;display:inline-block;background:#E9F0FE;padding:4px 10px;border-radius:20px;}
h1{font-family:'Inter', sans-serif;font-weight:700;font-size:36px;line-height:1.2;letter-spacing:-0.5px;margin-bottom:18px;}
.dek{font-size:17px;color:var(--ink-soft);}
.meta-row{display:flex;gap:20px;margin-top:22px;font-size:13px;color:var(--ink-soft);font-family:'IBM Plex Mono', monospace;}

/* Two-column article layout with sticky TOC */
.layout{display:grid;grid-template-columns:1fr 260px;gap:56px;padding-bottom:60px;border-top:1px solid var(--hairline);padding-top:44px;}
.toc{position:sticky;top:90px;align-self:start;background:var(--panel-tint);border:1px solid var(--hairline);border-radius:10px;padding:18px 20px;}
.toc span.eyebrow{margin-bottom:10px;}
.toc a{display:block;font-size:13.5px;color:var(--ink-soft);padding:6px 0;}
.toc a:hover{color:var(--registry-blue);}

.content h2{font-family:'Inter', sans-serif;font-weight:700;font-size:23px;margin:44px 0 16px;letter-spacing:-0.3px;}
.content p{font-size:15.5px;margin-bottom:16px;color:#33404F;}
.content ul{margin:0 0 16px 20px;font-size:15.5px;color:#33404F;}
.content li{margin-bottom:8px;}

.callout{background:var(--panel-tint);border:1px solid var(--hairline);border-left:3px solid var(--registry-blue);border-radius:0 8px 8px 0;padding:16px 20px;font-size:14.5px;color:var(--ink);margin:24px 0;}
.callout strong{color:var(--registry-blue);}

/* Numbered steps */
.steps{display:flex;flex-direction:column;gap:0;margin-top:8px;}
.step{display:grid;grid-template-columns:52px 1fr;gap:20px;padding:26px 0;border-bottom:1px solid var(--hairline);}
.step:first-child{border-top:1px solid var(--hairline);}
.step .num{font-family:'Inter', sans-serif;font-weight:700;font-size:24px;color:var(--registry-blue);}
.step h3{font-family:'Inter', sans-serif;font-size:16.5px;font-weight:600;margin-bottom:8px;}
.step p{font-size:14.5px;color:var(--ink-soft);margin-bottom:0;}

/* Tables */
table{width:100%;border-collapse:collapse;margin:20px 0 32px;font-size:14.5px;}
th,td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--hairline);}
th{font-family:'Inter', sans-serif;font-size:11.5px;letter-spacing:0.5px;text-transform:uppercase;color:var(--ink-soft);font-weight:700;}
td.mono{font-family:'IBM Plex Mono', monospace;}

/* Ratifye bridge block, embedded within articles */
.bridge-inline{background:var(--ink);color:#fff;padding:36px 32px;border-radius:12px;margin-top:20px;}
.bridge-inline .eyebrow{background:rgba(93,141,239,0.15);color:#5B8DEF;}
.bridge-inline h3{font-family:'Inter', sans-serif;font-size:20px;margin-bottom:10px;font-weight:700;}
.bridge-inline p{color:#AEB8C7;font-size:14.5px;margin-bottom:20px;}
.btn-primary{background:var(--registry-blue);color:#fff;padding:12px 22px;font-size:14px;font-weight:600;border-radius:6px;display:inline-block;}
.btn-primary:hover{background:#1547B8;}
.btn-ghost{border:1px solid var(--hairline);color:var(--ink);padding:13px 24px;font-size:14.5px;font-weight:600;border-radius:6px;display:inline-block;transition:border-color .15s;}
.btn-ghost:hover{border-color:var(--registry-blue);}

/* Homepage hero */
.hero{padding:64px 0 56px;display:grid;grid-template-columns:1.1fr 0.9fr;gap:56px;align-items:center;}
.hero p.lede{font-size:17px;color:var(--ink-soft);max-width:480px;margin-bottom:32px;}
.hero-ctas{display:flex;gap:14px;flex-wrap:wrap;}
.barcode-panel{background:var(--ink);padding:24px;border-radius:12px;}
.bars{display:flex;align-items:stretch;height:64px;gap:2px;margin-bottom:16px;}
.bars span{background:#fff;display:block;}
.digits{font-family:'IBM Plex Mono', monospace;color:#fff;font-size:15px;letter-spacing:4px;text-align:center;opacity:0.92;}
.decode-label{font-family:'IBM Plex Mono', monospace;color:#8A93A8;font-size:11px;letter-spacing:1.5px;text-transform:uppercase;text-align:center;margin-top:14px;}

.section{padding:48px 0;}
.section-head{margin-bottom:32px;max-width:600px;}
.section-head .eyebrow{margin-bottom:10px;}
.section-head h2{font-family:'Inter', sans-serif;font-weight:700;font-size:26px;letter-spacing:-0.4px;}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;}
.card{background:var(--panel-tint);border:1px solid var(--hairline);border-radius:12px;padding:26px;}
.card .tag{font-family:'Inter', sans-serif;font-size:11px;font-weight:700;color:var(--registry-blue);letter-spacing:0.5px;text-transform:uppercase;margin-bottom:14px;display:block;}
.card h3{font-family:'Inter', sans-serif;font-weight:700;font-size:18px;margin-bottom:10px;line-height:1.3;}
.card p{font-size:14.5px;color:var(--ink-soft);margin-bottom:18px;}
.card a.read{font-size:13.5px;font-weight:600;color:var(--registry-blue);}
.card a.read:hover{text-decoration:underline;}

.blog-row{border-top:1px solid var(--hairline);}
.blog-list{display:flex;flex-direction:column;}
.blog-item{display:grid;grid-template-columns:120px 1fr auto;gap:24px;align-items:center;padding:20px 0;border-bottom:1px solid var(--hairline);}
.blog-item:first-child{border-top:none;}
.blog-item .idx{font-family:'Inter', sans-serif;font-weight:700;color:var(--registry-blue);font-size:11.5px;letter-spacing:0.5px;}
.blog-item h4{font-family:'Inter', sans-serif;font-weight:600;font-size:16.5px;}
.blog-item .arrow{color:var(--registry-blue);font-size:18px;}

.bridge{background:var(--ink);color:#fff;padding:56px 0;margin-top:32px;}
.bridge .wrap{display:grid;grid-template-columns:1fr auto;gap:40px;align-items:center;}
.bridge .eyebrow{background:rgba(93,141,239,0.15);color:#5B8DEF;}
.bridge h2{font-family:'Inter', sans-serif;font-weight:700;font-size:25px;max-width:520px;line-height:1.3;margin-bottom:0;}
.bridge p{color:#AEB8C7;margin-top:12px;max-width:520px;font-size:15px;}
.bridge .btn-primary{white-space:nowrap;}

footer{border-top:1px solid var(--hairline);padding:32px 0;margin-top:20px;}
.footer-inner{display:flex;justify-content:space-between;align-items:flex-start;flex-wrap:wrap;gap:24px;}
.footer-note{font-size:13px;color:var(--ink-soft);max-width:440px;}
.footer-links{display:flex;gap:24px;}
.footer-links a{font-size:13.5px;color:var(--ink-soft);}
.footer-links a:hover{color:var(--registry-blue);}

@media (max-width:860px){
  .hero{grid-template-columns:1fr;padding-top:36px;}
  h1{font-size:28px;}
  .cards{grid-template-columns:1fr;}
  .bridge .wrap{grid-template-columns:1fr;}
  .blog-item{grid-template-columns:auto 1fr auto;}
  .layout{grid-template-columns:1fr;}
  .toc{display:none;}

  .hamburger{display:flex;}
  nav{
    display:flex;position:absolute;top:100%;left:0;right:0;
    background:var(--paper);border-bottom:1px solid var(--hairline);
    flex-direction:column;align-items:flex-start;gap:0;padding:8px 28px 16px;
    max-height:0;overflow:hidden;opacity:0;pointer-events:none;
    transition:max-height .2s ease, opacity .2s ease;
  }
  nav a{padding:10px 0;width:100%;}
  nav a.nav-cta{width:auto;margin-top:8px;}
  .menu-toggle:checked ~ nav{max-height:320px;opacity:1;pointer-events:auto;}
}