:root{
  --primary:#b91c1c;
  --secondary:#7f1d1d;
  --accent:#64748b;
  --bg:#ffffff;
  --surface:#fef2f2;
  --surface-alt:#fee2e2;
  --text:#7f1d1d;
  --muted:#5f6e7d;
  --border:#fecaca;
  --row-alt:#fef2f2;
  --radius:8px;
  --shadow:0 6px 20px rgba(127,29,29,.10);
  --shadow-soft:0 2px 8px rgba(127,29,29,.06);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.65;
  font-size:16px;
}
img,svg{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1120px;margin:0 auto;padding:0 20px}

/* Header */
.site-header{
  position:sticky;top:0;z-index:50;
  background:linear-gradient(135deg,var(--primary),var(--secondary));
  color:#fff;
  box-shadow:var(--shadow);
}
.site-header a{color:#fff}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 20px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:.3px}
.brand img{width:36px;height:36px}
.brand-name{font-size:1.15rem}
.nav{display:flex;flex-wrap:wrap;gap:6px}
.nav a{
  padding:8px 12px;border-radius:6px;
  font-size:.95rem;font-weight:500;
  transition:background .2s ease;
}
.nav a:hover{background:rgba(255,255,255,.15);text-decoration:none}
.nav a.active{background:rgba(255,255,255,.22)}

/* Hero */
.hero{
  background:linear-gradient(135deg,var(--primary),var(--secondary));
  color:#fff;
  padding:56px 20px 64px;
}
.hero .container{text-align:left}
.hero h1{
  font-size:clamp(1.7rem,3.2vw,2.55rem);
  line-height:1.15;
  margin:0 0 14px;
  color:#fff;
  letter-spacing:-.4px;
}
.hero .byline{color:rgba(255,255,255,.9);margin:0 0 12px;font-size:.95rem}
.hero .lede{font-size:1.08rem;color:rgba(255,255,255,.95);max-width:820px;margin:0 0 24px}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:8px}
.pill{
  display:inline-block;padding:11px 22px;border-radius:999px;
  font-weight:600;font-size:.95rem;
  transition:transform .15s ease, box-shadow .15s ease;
}
.pill-solid{background:#fff;color:var(--primary)}
.pill-solid:hover{transform:translateY(-1px);box-shadow:0 8px 22px rgba(0,0,0,.18);text-decoration:none}
.pill-ghost{border:2px solid rgba(255,255,255,.7);color:#fff}
.pill-ghost:hover{background:rgba(255,255,255,.14);text-decoration:none}

/* Main */
main{padding:36px 0 60px}
main .container{max-width:900px}
p{margin:0 0 14px}
h2{
  font-size:clamp(1.35rem,2.2vw,1.75rem);
  margin:36px 0 14px;padding:10px 14px;
  background:var(--surface);
  border-left:5px solid var(--primary);
  border-radius:0 var(--radius) var(--radius) 0;
  color:var(--secondary);
  letter-spacing:-.2px;
}
h3{font-size:1.15rem;margin:22px 0 8px;color:var(--secondary)}
h4{font-size:1rem;margin:16px 0 6px;color:var(--secondary)}
.byline{color:var(--muted);font-size:.92rem;margin-bottom:18px}

/* ToC */
.toc{
  background:var(--surface);
  border:1px solid var(--border);
  border-left:5px solid var(--accent);
  border-radius:var(--radius);
  padding:16px 20px;
  margin:20px 0 26px;
}
.toc strong{display:block;color:var(--secondary);margin-bottom:8px;font-size:.95rem;letter-spacing:.4px;text-transform:uppercase}
.toc ol{margin:0;padding-left:22px;column-count:1}
@media(min-width:700px){.toc ol{column-count:2;column-gap:28px}}
.toc li{margin:4px 0;break-inside:avoid}
.toc a{color:var(--secondary);font-size:.94rem}

/* Lists */
ul{list-style:none;padding-left:0}
ul li{position:relative;padding-left:24px;margin:8px 0}
ul li::before{content:"➤";position:absolute;left:0;color:var(--primary);font-size:.85rem;top:2px}
ol{counter-reset:num;list-style:none;padding-left:0}
ol li{position:relative;padding:6px 0 6px 44px;margin:6px 0;counter-increment:num;min-height:32px}
ol li::before{
  content:counter(num);
  position:absolute;left:0;top:2px;
  width:30px;height:30px;line-height:30px;
  text-align:center;
  background:linear-gradient(135deg,var(--primary),var(--secondary));
  color:#fff;border-radius:50%;
  font-weight:700;font-size:.88rem;
}

/* Tables */
.table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius);margin:18px 0;box-shadow:var(--shadow-soft)}
table{width:100%;border-collapse:collapse;font-size:.94rem;min-width:520px}
thead th{
  background:linear-gradient(135deg,var(--primary),var(--secondary));
  color:#fff;text-align:left;padding:11px 14px;font-weight:600;
}
tbody td{padding:10px 14px;border-top:1px solid var(--border);color:var(--text)}
tbody tr:nth-child(even){background:var(--row-alt)}

/* Callouts */
.callout{
  background:var(--surface-alt);
  border:1px solid var(--border);
  border-left:5px solid var(--primary);
  border-radius:var(--radius);
  padding:14px 18px;margin:20px 0;
}
.callout strong{color:var(--secondary)}

/* Cards / Stats */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px;margin:22px 0}
.stat{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:16px;text-align:center;
  box-shadow:var(--shadow-soft);
}
.stat .n{font-size:1.55rem;font-weight:700;color:var(--primary);display:block;line-height:1.1}
.stat .l{font-size:.86rem;color:var(--muted);margin-top:4px;display:block}

/* Figures */
figure{margin:22px 0;text-align:center}
figure svg{margin:0 auto;max-width:100%;height:auto}
figcaption{font-size:.86rem;color:var(--muted);margin-top:6px;text-align:center;font-style:italic}

/* FAQ accordion */
.faq details{
  background:#fff;
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:14px 18px;margin:10px 0;
  box-shadow:var(--shadow-soft);
  transition:box-shadow .2s ease;
}
.faq details[open]{box-shadow:var(--shadow);background:var(--surface)}
.faq summary{
  cursor:pointer;font-weight:600;color:var(--secondary);
  list-style:none;position:relative;padding-right:28px;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{
  content:"▼";position:absolute;right:0;top:2px;color:var(--primary);
  transition:transform .2s ease;font-size:.8rem;
}
.faq details[open] summary::after{transform:rotate(180deg)}
.faq p{margin:10px 0 0;color:var(--text)}

/* Author box */
.author-box{
  display:flex;align-items:center;gap:16px;
  background:linear-gradient(135deg,var(--surface),var(--surface-alt));
  border:1px solid var(--border);
  border-left:5px solid var(--accent);
  border-radius:var(--radius);
  padding:18px;margin:32px 0;
  box-shadow:var(--shadow-soft);
}
.author-box img{width:80px;height:80px;border-radius:50%;flex:0 0 80px;border:2px solid var(--border)}
.author-name{font-weight:700;color:var(--secondary);margin:0}
.author-role{font-size:.88rem;color:var(--primary);margin:2px 0 6px;font-weight:600}
.author-bio{font-size:.92rem;color:var(--muted);margin:0}

/* CTA banner */
.cta-banner{
  background:linear-gradient(135deg,var(--primary),var(--secondary));
  color:#fff;
  border-radius:var(--radius);
  padding:22px 24px;margin:32px 0;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;
}
.cta-banner p{margin:0;color:#fff;font-size:1.02rem;max-width:640px}
.cta-banner .pill-solid{background:#fff;color:var(--primary)}

/* Footer */
.site-footer{
  background:var(--secondary);
  color:#fbe9e9;
  padding:32px 20px 22px;margin-top:32px;
}
.site-footer .container{max-width:1120px}
.footer-cols{display:grid;grid-template-columns:1fr;gap:22px;margin-bottom:20px}
@media(min-width:700px){.footer-cols{grid-template-columns:2fr 1fr 1fr}}
.footer-cols h3{color:#fff;margin:0 0 8px;font-size:1rem}
.footer-cols a{color:#fbe9e9;font-size:.92rem;display:block;padding:3px 0}
.footer-cols a:hover{color:#fff}
.footer-note{border-top:1px solid rgba(255,255,255,.15);padding-top:14px;font-size:.85rem;color:#f5cccc}
.footer-note p{margin:0 0 6px;color:#f5cccc}

/* Breadcrumbs */
.crumbs{font-size:.88rem;color:var(--muted);margin:14px 0 0}
.crumbs a{color:var(--primary)}

/* Utility */
.small{font-size:.88rem;color:var(--muted)}
.center{text-align:center}
hr{border:0;height:1px;background:var(--border);margin:28px 0}

/* Mobile */
@media(max-width:700px){
  .hero{padding:40px 18px 46px}
  main{padding:24px 0 40px}
  h2{font-size:1.25rem;padding:8px 12px}
  .nav a{padding:6px 10px;font-size:.9rem}
  .brand-name{display:none}
  .cta-banner{padding:18px}
}

/* 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}}