/* Levinko — Blueprint Engineering design tokens */
:root{
  --primary:#1E3A5F;
  --secondary:#3B82A6;
  --accent:#F59E0B;
  --text:#1F2937;
  --text-muted:#526174;
  --bg:#F8FAFC;
  --surface:#FFFFFF;
  --border:#D6DEE8;
  --blueprint-line:#D6DEE8;
  --button-text:#1F2937;
  --focus:#1E3A5F;
  --radius:4px;
  --font-body:'IBM Plex Sans',Arial,sans-serif;
  --font-tech:'IBM Plex Mono',ui-monospace,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:var(--font-body);font-size:18px;line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3{color:var(--primary);line-height:1.08;font-weight:600;margin:0 0 .6em}
h1{font-size:clamp(48px,4.4vw,68px);letter-spacing:-.01em}
h2{font-size:36px;margin-top:2.2em}
h3{font-size:22px;margin-top:1.8em}
p{margin:0 0 1.1em}
a{color:var(--primary);text-decoration:underline;text-underline-offset:3px}
a:hover{color:var(--secondary)}
img,svg{max-width:100%;height:auto}
.container{max-width:1320px;margin:0 auto;padding:0 48px}

/* accessibility */
.skip{position:absolute;left:-9999px;top:0;background:var(--primary);color:#fff;padding:12px 20px;z-index:200;border-radius:0 0 4px 0}
.skip:focus{left:0;color:#fff}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-radius:2px}

/* header */
.site-header{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}
.header-inner{display:flex;align-items:center;gap:32px;min-height:76px}
.brand{font-weight:600;font-size:22px;color:var(--primary);text-decoration:none;letter-spacing:.02em;white-space:nowrap}
.brand small{display:block;font-size:11px;font-weight:400;color:var(--text-muted);letter-spacing:.14em}
.main-nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.main-nav>a,.nav-drop>button{font-size:16px;font-weight:500;color:var(--text);text-decoration:none;background:none;border:0;cursor:pointer;padding:12px 14px;font-family:inherit;min-height:44px;display:inline-flex;align-items:center}
.main-nav>a:hover,.nav-drop>button:hover{color:var(--primary)}
.nav-drop{position:relative}
.nav-drop .drop-panel{position:absolute;top:100%;left:0;min-width:320px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:8px;display:none}
.nav-drop:hover .drop-panel,.nav-drop:focus-within .drop-panel{display:block}
.drop-panel a{display:block;padding:10px 14px;color:var(--text);text-decoration:none;font-size:15px;border-radius:3px}
.drop-panel a:hover{background:var(--bg);color:var(--primary)}
.header-cta{margin-left:16px}
.menu-toggle{display:none}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:12px 28px;border-radius:var(--radius);font-weight:600;font-size:17px;text-decoration:none;cursor:pointer;border:1px solid transparent;font-family:inherit;transition:background-color .18s ease,color .18s ease}
.btn-primary{background:var(--accent);color:var(--button-text)}
.btn-primary:hover{background:#e08e06;color:var(--button-text)}
.btn-secondary{background:transparent;color:var(--primary);border-color:var(--primary)}
.btn-secondary:hover{background:var(--primary);color:#fff}
.btn-row{display:flex;gap:16px;flex-wrap:wrap;margin-top:28px}

/* hero */
.hero{padding:88px 0 64px}
.hero-grid{display:grid;grid-template-columns:5fr 7fr;gap:48px;align-items:center}
.hero-full{max-width:900px}
.eyebrow{font-family:var(--font-tech);font-size:13px;letter-spacing:.18em;color:var(--secondary);margin:0 0 16px;text-transform:uppercase}
.hero p.lead{font-size:20px;color:var(--text);max-width:60ch}
.hero h1{margin-bottom:20px}
.breadcrumb{font-size:14px;color:var(--text-muted);margin-bottom:16px;font-family:var(--font-tech)}
.breadcrumb a{color:var(--text-muted)}

/* blueprint figures */
.figure-blueprint{
  background:
    linear-gradient(var(--blueprint-line) 1px,transparent 1px),
    linear-gradient(90deg,var(--blueprint-line) 1px,transparent 1px),
    #FCFEFF;
  background-size:24px 24px;
  border:1px solid var(--border);border-radius:var(--radius);
  padding:24px;margin:0;
}
.figure-blueprint svg{display:block;width:100%;height:auto}
.figure-blueprint figcaption{font-family:var(--font-tech);font-size:13px;color:var(--text-muted);margin-top:12px}
.bp-label{font-family:var(--font-tech);font-size:12px;fill:var(--text-muted)}
.bp-title{font-family:var(--font-tech);font-size:13px;font-weight:500;fill:var(--primary)}
.bp-struct{fill:#FFFFFF;stroke:var(--primary);stroke-width:2}
.bp-sub{fill:#FFFFFF;stroke:var(--primary);stroke-width:1.5}
.bp-detail{fill:none;stroke:var(--primary);stroke-width:1.5}
.bp-anno{fill:none;stroke:var(--secondary);stroke-width:1.5;stroke-dasharray:6 4}
.bp-note{font-family:var(--font-tech);font-size:11px;font-style:italic;fill:var(--text-muted)}
.bp-dim{stroke:var(--secondary);stroke-width:1}
.bp-accent{fill:var(--accent);stroke:var(--primary);stroke-width:1.5}

/* evidence band */
.evidence{border-top:1px solid var(--border);border-bottom:1px solid var(--border);background:var(--surface)}
.evidence-inner{display:flex;gap:0;overflow-x:auto;padding:20px 0}
.evidence-item{flex:1 0 auto;min-width:190px;padding:4px 28px;border-left:1px solid var(--border)}
.evidence-item:first-child{border-left:0;padding-left:0}
.evidence-item .k{font-family:var(--font-tech);font-size:13px;color:var(--text-muted);display:block;margin-bottom:4px}
.evidence-item .v{font-weight:600;color:var(--primary);font-size:17px}

/* article */
.article-wrap{padding:64px 0 88px}
.prose{max-width:68ch}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.4em}
.prose li{margin-bottom:.5em}
.prose li::marker{color:var(--primary)}
.prose strong{color:var(--primary)}
.prose hr{border:0;border-top:1px solid var(--border);margin:48px 0}
.article-grid{display:grid;grid-template-columns:minmax(0,68ch) 300px;gap:64px;align-items:start}
.toc{position:sticky;top:110px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);padding:24px;font-size:15px}
.toc h2{font-size:16px;margin:0 0 12px;font-family:var(--font-tech);letter-spacing:.06em}
.toc ol{margin:0;padding-left:1.2em}
.toc li{margin-bottom:8px}
.toc a{text-decoration:none;color:var(--text)}
.toc a:hover{color:var(--primary);text-decoration:underline}

/* product cards / related */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;margin-top:32px}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:32px;display:flex;flex-direction:column}
.card h3{margin-top:0;font-size:22px}
.card p{font-size:16px;color:var(--text);flex:1}
.card .meta{font-family:var(--font-tech);font-size:13px;color:var(--text-muted);margin-bottom:12px}
.card a.card-link{font-weight:600;text-decoration:none}
.related{margin-top:80px}
.related h2{font-size:28px}

/* CTA band */
.cta-band{background:var(--primary);color:#fff;padding:72px 0;margin-top:96px}
.cta-band h2{color:#fff;font-size:36px;margin:0 0 12px}
.cta-band p{color:#D6DEE8;max-width:64ch;font-size:18px}
.cta-band .btn-row{margin-top:28px}
.cta-band .btn-secondary{color:#fff;border-color:#fff}
.cta-band .btn-secondary:hover{background:#fff;color:var(--primary)}

/* footer */
.site-footer{background:var(--surface);border-top:1px solid var(--border);padding:64px 0 32px;margin-top:0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:48px}
.site-footer h2{font-size:15px;font-family:var(--font-tech);letter-spacing:.08em;text-transform:uppercase;margin:0 0 16px}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin-bottom:10px}
.site-footer a{color:var(--text);text-decoration:none;font-size:16px}
.site-footer a:hover{color:var(--primary);text-decoration:underline}
.footer-brand{font-weight:600;font-size:20px;color:var(--primary)}
.footer-contact{font-size:16px}
.footer-contact a{color:var(--primary)}
.footer-bottom{margin-top:48px;padding-top:24px;border-top:1px solid var(--border);font-size:14px;color:var(--text-muted);display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}

/* forms */
.inquiry-form{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:40px}
.field{margin-bottom:20px}
.field label{display:block;font-weight:600;margin-bottom:8px;font-size:16px}
.field .hint{font-size:14px;color:var(--text-muted);font-weight:400}
.field input,.field select,.field textarea{width:100%;padding:12px 14px;font-size:16px;font-family:inherit;border:1px solid var(--border);border-radius:var(--radius);background:var(--bg);color:var(--text);min-height:44px}
.field textarea{min-height:140px;resize:vertical}
.field input:focus,.field select:focus,.field textarea:focus{outline:3px solid var(--focus);outline-offset:1px;background:#fff}
.form-note{font-size:14px;color:var(--text-muted);margin-top:16px}
.contact-grid{display:grid;grid-template-columns:7fr 5fr;gap:48px;align-items:start}
.contact-info{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:40px}
.contact-info h2{font-size:22px;margin-top:0}
.contact-info p{font-size:16px}

/* blog */
.blog-list{list-style:none;margin:0;padding:0;display:grid;gap:32px}
.blog-list li{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:36px}
.blog-list h2{font-size:28px;margin:0 0 12px}
.blog-list h2 a{text-decoration:none;color:var(--primary)}
.blog-list h2 a:hover{text-decoration:underline}
.blog-list .k{font-family:var(--font-tech);font-size:13px;color:var(--text-muted);display:block;margin-bottom:12px}
.read-more{font-weight:600}

/* thanks / 404 */
.slim{max-width:720px;padding:96px 0}
.slim h1{font-size:48px}

/* responsive */
@media (max-width:1024px){
  .container{padding:0 32px}
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .article-grid{grid-template-columns:1fr}
  .toc{position:static;margin-bottom:32px}
  .cards{grid-template-columns:1fr 1fr}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:768px){
  body{font-size:17px}
  h1{font-size:36px}
  h2{font-size:28px}
  .container{padding:0 20px}
  .hero{padding:56px 0 40px}
  .article-wrap{padding:40px 0 56px}
  .main-nav{display:none;position:absolute;top:100%;left:0;right:0;background:var(--surface);flex-direction:column;align-items:stretch;border-bottom:1px solid var(--border);padding:8px 20px 20px;box-shadow:none}
  .main-nav.open{display:flex}
  .nav-drop .drop-panel{position:static;display:block;border:0;padding:0 0 0 16px}
  .nav-drop>button{width:100%;justify-content:flex-start}
  .menu-toggle{display:inline-flex;margin-left:auto;background:none;border:1px solid var(--border);border-radius:var(--radius);min-width:44px;min-height:44px;align-items:center;justify-content:center;cursor:pointer;color:var(--primary);font-size:22px}
  .header-cta{display:none}
  .cards{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .cta-band h2{font-size:28px}
  .evidence-item{min-width:170px;padding:4px 20px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}