:root{
  --primary:#d97706;
  --secondary:#92400e;
  --accent:#1d4ed8;
  --bg:#ffffff;
  --surface:#fffbeb;
  --surface-alt:#fef3c7;
  --text:#78350f;
  --muted:#6b7280;
  --border:#fde68a;
  --row-alt:#fffbeb;
  --radius:10px;
  --shadow:0 4px 20px rgba(217,119,6,.08);
  --shadow-lg:0 10px 40px rgba(146,64,14,.14);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.65;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--accent);text-decoration:none;border-bottom:1px solid rgba(29,78,216,.3)}
a:hover{color:var(--secondary);border-bottom-color:var(--secondary)}
img,svg{max-width:100%;height:auto;display:block}
.container{max-width:1120px;margin:0 auto;padding:0 20px}
/* Header */
.site-header{
  background:linear-gradient(135deg,var(--surface) 0%,#fff 60%);
  border-bottom:2px solid var(--border);
  position:sticky;top:0;z-index:20;
  box-shadow:var(--shadow);
}
.site-header .container{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:14px;padding-bottom:14px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;color:var(--secondary);border-bottom:0}
.brand img{width:40px;height:40px}
.nav{display:flex;flex-wrap:wrap;gap:6px}
.nav a{
  padding:8px 14px;
  border-radius:8px;
  color:var(--text);
  border-bottom:0;
  font-weight:500;
  font-size:14.5px;
  transition:background .15s;
}
.nav a:hover{background:var(--surface-alt);color:var(--secondary)}
.nav a.active{background:var(--primary);color:#fff}
/* Hero */
.hero{
  background:
    radial-gradient(circle at 88% 15%,rgba(29,78,216,.09) 0,transparent 45%),
    radial-gradient(circle at 8% 90%,rgba(217,119,6,.13) 0,transparent 55%),
    linear-gradient(155deg,var(--surface-alt) 0%,#fff 70%);
  padding:56px 0 44px;
  border-bottom:1px solid var(--border);
}
.hero h1{
  font-size:clamp(28px,4.4vw,42px);
  line-height:1.18;
  margin:0 0 14px;
  color:var(--secondary);
  letter-spacing:-.5px;
}
.byline{
  color:var(--muted);
  font-size:14.5px;
  margin:0 0 14px;
}
.byline strong{color:var(--text)}
.lede{font-size:18px;color:var(--text);max-width:780px;margin:0}
.lede p{margin:0 0 6px}
.cta-row{margin-top:22px;display:flex;gap:12px;flex-wrap:wrap}
.btn{
  display:inline-block;
  padding:12px 22px;
  border-radius:8px;
  font-weight:600;
  font-size:15px;
  border:0;
  cursor:pointer;
  border-bottom:0;
  transition:transform .1s,box-shadow .2s;
}
.btn-primary{
  background:linear-gradient(135deg,var(--primary),var(--secondary));
  color:#fff;
  box-shadow:0 4px 14px rgba(217,119,6,.32);
}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 20px rgba(146,64,14,.4);color:#fff}
.btn-secondary{
  background:#fff;
  color:var(--accent);
  border:2px solid var(--accent);
}
.btn-secondary:hover{background:var(--accent);color:#fff}
/* Main */
main{padding:44px 0 72px}
main h2{
  font-size:clamp(22px,3vw,28px);
  color:var(--secondary);
  margin:44px 0 14px;
  padding:8px 0 8px 18px;
  border-left:5px solid var(--primary);
  background:linear-gradient(90deg,var(--surface) 0%,transparent 70%);
  scroll-margin-top:110px;
  line-height:1.25;
}
main h2:first-of-type{margin-top:0}
main h3{
  font-size:19px;
  color:var(--secondary);
  margin:26px 0 10px;
}
main p{margin:0 0 14px}
main ul,main ol{margin:0 0 18px;padding-left:0;list-style:none}
main ul li{
  position:relative;
  padding:6px 0 6px 30px;
}
main ul li::before{
  content:"→";
  position:absolute;
  left:6px;
  color:var(--primary);
  font-weight:700;
}
main ol{counter-reset:ol-count}
main ol li{
  position:relative;
  padding:6px 0 6px 42px;
  counter-increment:ol-count;
}
main ol li::before{
  content:counter(ol-count);
  position:absolute;
  left:0;top:6px;
  width:28px;height:28px;
  background:linear-gradient(135deg,var(--primary),var(--secondary));
  color:#fff;
  border-radius:50%;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:13px;
  font-weight:700;
}
/* ToC */
.toc{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:18px 22px;
  margin:24px 0;
  box-shadow:var(--shadow);
}
.toc h2{
  font-size:16px !important;
  margin:0 0 10px !important;
  padding:0 !important;
  border-left:0 !important;
  background:transparent !important;
  text-transform:uppercase;
  letter-spacing:1px;
  color:var(--primary) !important;
}
.toc ol{margin:0;padding:0;list-style:decimal;padding-left:22px;column-count:2;column-gap:26px}
.toc ol li{padding:3px 0;position:static;counter-increment:none}
.toc ol li::before{content:none}
.toc a{border-bottom:0;color:var(--text);font-size:14.5px}
.toc a:hover{color:var(--primary)}
/* Tables */
.table-wrap{overflow-x:auto;margin:20px 0;border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--shadow)}
table{width:100%;border-collapse:collapse;background:#fff;font-size:14.5px}
th,td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--border);vertical-align:top}
th{
  background:linear-gradient(135deg,var(--primary),var(--secondary));
  color:#fff;
  font-weight:600;
  font-size:14px;
  letter-spacing:.3px;
}
tbody tr:nth-child(even){background:var(--row-alt)}
tbody tr:hover{background:var(--surface-alt)}
/* Callout */
.callout{
  background:linear-gradient(135deg,var(--surface),var(--surface-alt));
  border-left:5px solid var(--accent);
  border-radius:var(--radius);
  padding:18px 22px;
  margin:22px 0;
  color:var(--text);
}
.callout strong{color:var(--secondary)}
/* Cards */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px;margin:22px 0}
.card{
  background:#fff;
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:20px;
  box-shadow:var(--shadow);
  transition:transform .15s,box-shadow .2s;
}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.card h3{margin-top:0}
/* FAQ */
.faq details{
  border:1px solid var(--border);
  border-radius:var(--radius);
  margin-bottom:10px;
  background:#fff;
  overflow:hidden;
  box-shadow:var(--shadow);
}
.faq summary{
  padding:14px 20px;
  cursor:pointer;
  font-weight:600;
  color:var(--secondary);
  list-style:none;
  position:relative;
  padding-right:44px;
  background:linear-gradient(90deg,var(--surface) 0%,transparent 100%);
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{
  content:"▼";
  position:absolute;
  right:20px;
  top:50%;
  transform:translateY(-50%);
  color:var(--primary);
  transition:transform .2s;
  font-size:12px;
}
.faq details[open] summary::after{transform:translateY(-50%) rotate(180deg)}
.faq details[open] summary{background:var(--surface-alt);border-bottom:1px solid var(--border)}
.faq .faq-body{padding:14px 20px 18px}
.faq .faq-body p{margin:0 0 8px}
/* Author box */
.author-box{
  background:linear-gradient(135deg,var(--surface),var(--surface-alt));
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:22px;
  margin:36px 0 20px;
  display:flex;
  gap:18px;
  align-items:flex-start;
  box-shadow:var(--shadow);
}
.author-box img{
  width:72px;height:72px;
  border-radius:50%;
  border:3px solid var(--primary);
  flex-shrink:0;
}
.author-box h3{margin:0 0 6px;color:var(--secondary)}
.author-box .role{color:var(--primary);font-size:14px;font-weight:600;margin:0 0 8px}
.author-box p{margin:0;font-size:14.5px}
/* Figures */
figure{margin:22px 0;text-align:center}
figure svg{margin:0 auto;background:var(--surface);border-radius:var(--radius);padding:20px;border:1px solid var(--border);box-shadow:var(--shadow);width:100%;max-width:640px;height:auto}
figcaption{font-size:14px;color:var(--muted);margin-top:8px;font-style:italic}
/* Footer */
.site-footer{
  background:linear-gradient(135deg,var(--secondary),#5a2408);
  color:#fde68a;
  padding:38px 0 24px;
  margin-top:60px;
  font-size:14.5px;
}
.site-footer a{color:#fef3c7;border-bottom:1px solid rgba(254,243,199,.3)}
.site-footer a:hover{color:#fff;border-bottom-color:#fff}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:26px;margin-bottom:24px}
.footer-grid h3{color:#fff;margin:0 0 10px;font-size:15px;text-transform:uppercase;letter-spacing:.6px}
.footer-grid ul{list-style:none;padding:0;margin:0}
.footer-grid li{padding:3px 0}
.footer-grid li::before{content:""}
.footer-bottom{border-top:1px solid rgba(253,230,138,.2);padding-top:16px;font-size:13px;text-align:center;color:#fef3c7}
/* Responsive */
@media (max-width:700px){
  .toc ol{column-count:1}
  .hero{padding:36px 0 30px}
  .author-box{flex-direction:column}
  .author-box img{width:60px;height:60px}
  .site-header .container{flex-direction:column;align-items:flex-start}
  .nav{width:100%}
}

/* a11y additions */
.skip-link{position:absolute;left:-9999px;top:0;background:var(--primary);color:#fff;padding:10px 16px;border-radius:4px;z-index:1000;text-decoration:none;font-weight:700}
.skip-link:focus{left:12px;top:12px}
a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
@media (prefers-reduced-motion: reduce){*,*::before,*::after{transition-duration:.01ms !important;animation-duration:.01ms !important}}