:root{
  --primary:#dc2626;
  --secondary:#991b1b;
  --accent:#0f766e;
  --bg:#ffffff;
  --surface:#fef2f2;
  --surface-alt:#fee2e2;
  --text:#7f1d1d;
  --muted:#5d6b7d;
  --border:#fecaca;
  --row-alt:#fef2f2;
  --radius:8px;
  --shadow:0 6px 18px rgba(153,27,27,.08);
  --shadow-hover:0 10px 30px rgba(153,27,27,.14);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;line-height:1.65;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--secondary);text-decoration:underline;text-underline-offset:2px}
a:hover{color:var(--primary)}
.container{max-width:1080px;margin:0 auto;padding:0 20px}

header.site{background:var(--bg);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10;box-shadow:0 1px 6px rgba(153,27,27,.06)}
.brand{display:flex;align-items:center;gap:12px;padding:14px 0;flex-wrap:wrap;justify-content:space-between}
.brand-left{display:flex;align-items:center;gap:12px}
.brand-left img{width:40px;height:40px}
.brand-name{font-weight:700;font-size:1.15rem;color:var(--secondary);letter-spacing:.2px}
nav.primary ul{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:6px}
nav.primary a{display:inline-block;padding:8px 12px;border-radius:var(--radius);color:var(--secondary);text-decoration:none;font-size:.94rem;font-weight:500}
nav.primary a:hover{background:var(--surface-alt);color:var(--primary)}

.hero{background:linear-gradient(135deg,var(--surface) 0%,var(--surface-alt) 55%,#fca5a5 100%);padding:56px 0 44px;border-bottom:1px solid var(--border);position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;top:-40px;right:-40px;width:220px;height:220px;background:radial-gradient(circle,rgba(15,118,110,.18),transparent 70%);border-radius:50%}
.hero::after{content:"";position:absolute;bottom:-60px;left:-60px;width:280px;height:280px;background:radial-gradient(circle,rgba(220,38,38,.15),transparent 70%);border-radius:50%}
.hero .container{position:relative;z-index:1}
h1{font-size:clamp(1.6rem,3.6vw,2.35rem);line-height:1.2;margin:0 0 .55rem;color:var(--secondary);font-weight:800;letter-spacing:-.5px}
.byline{color:var(--muted);font-size:.92rem;margin:.25rem 0 1rem}
.byline strong{color:var(--secondary)}
.lede p{font-size:1.05rem;margin:.35rem 0}
.cta-row{margin-top:18px;display:flex;gap:10px;flex-wrap:wrap}
.cta{display:inline-block;padding:11px 20px;border-radius:var(--radius);background:var(--primary);color:#fff;text-decoration:none;font-weight:600;box-shadow:var(--shadow);transition:transform .15s ease,box-shadow .15s ease}
.cta:hover{transform:translateY(-1px);color:#fff;background:var(--secondary);box-shadow:var(--shadow-hover)}
.cta.secondary{background:transparent;color:var(--accent);border:2px solid var(--accent);padding:9px 18px}
.cta.secondary:hover{background:var(--accent);color:#fff}

main{padding:36px 0 20px}
section{margin:34px 0}
h2{font-size:1.5rem;line-height:1.3;margin:0 0 .8rem;padding:14px 16px 14px 18px;background:var(--surface);border-left:5px solid var(--primary);border-radius:0 var(--radius) var(--radius) 0;color:var(--secondary);font-weight:700}
h3{font-size:1.15rem;color:var(--secondary);margin:1.4rem 0 .5rem;font-weight:700}
p{margin:.55rem 0 1rem}

nav.toc{background:linear-gradient(180deg,var(--surface) 0%,#fff 100%);border:1px solid var(--border);border-radius:var(--radius);padding:20px 22px;margin:26px 0;box-shadow:var(--shadow)}
nav.toc h2{background:none;border-left:none;padding:0 0 8px;font-size:1.1rem;margin:0 0 8px}
nav.toc ol{margin:0;padding-left:22px;columns:2;column-gap:26px}
nav.toc li{margin:5px 0;break-inside:avoid}
nav.toc a{color:var(--secondary);text-decoration:none}
nav.toc a:hover{text-decoration:underline;color:var(--primary)}
@media(max-width:720px){nav.toc ol{columns:1}}

ul,ol{padding-left:22px;margin:.4rem 0 1.1rem}
ul{list-style:none;padding-left:6px}
ul li{position:relative;padding:4px 0 4px 26px;margin:2px 0}
ul li::before{content:"\27a4";position:absolute;left:0;top:4px;color:var(--accent);font-weight:700}
ol{counter-reset:ol;list-style:none;padding-left:6px}
ol li{position:relative;padding:6px 0 6px 40px;margin:4px 0;counter-increment:ol}
ol li::before{content:counter(ol);position:absolute;left:0;top:5px;width:28px;height:28px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;display:flex;align-items:center;justify-content:center;font-size:.88rem;font-weight:700}

.table-wrap{overflow-x:auto;border-radius:var(--radius);box-shadow:var(--shadow);margin:16px 0 20px;border:1px solid var(--border)}
table{width:100%;border-collapse:collapse;font-size:.96rem;background:#fff}
th,td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--border)}
th{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;font-weight:600;letter-spacing:.2px}
tbody tr:nth-child(even){background:var(--row-alt)}
tbody tr:hover{background:var(--surface-alt)}

details{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);margin:9px 0;padding:0;box-shadow:0 2px 6px rgba(153,27,27,.05)}
summary{padding:14px 46px 14px 16px;font-weight:600;color:var(--secondary);cursor:pointer;list-style:none;position:relative}
summary::-webkit-details-marker{display:none}
summary::after{content:"\25bc";position:absolute;right:16px;top:50%;transform:translateY(-50%);color:var(--primary);transition:transform .2s ease;font-size:.85rem}
details[open]>summary::after{transform:translateY(-50%) rotate(180deg)}
details[open]>summary{background:var(--surface-alt);border-radius:var(--radius) var(--radius) 0 0}
details>*:not(summary){padding:2px 16px 14px}

.author-box{margin:36px 0 10px;background:linear-gradient(135deg,var(--surface) 0%,var(--surface-alt) 100%);border:1px solid var(--border);border-radius:var(--radius);padding:22px;display:flex;gap:18px;align-items:flex-start;box-shadow:var(--shadow)}
.author-box img{width:76px;height:76px;border-radius:50%;flex-shrink:0;border:3px solid #fff;box-shadow:0 4px 10px rgba(0,0,0,.1)}
.author-box h3{margin:0 0 4px;color:var(--secondary)}
.author-box p{margin:.25rem 0;font-size:.94rem;color:var(--text)}
.author-role{color:var(--accent);font-weight:600;font-size:.9rem}

figure.inline{margin:20px 0;text-align:center}
figure.inline svg{max-width:100%;height:auto}
figure.inline figcaption{color:var(--muted);font-size:.86rem;margin-top:8px;font-style:italic}

.callout{background:var(--surface-alt);border-left:4px solid var(--accent);border-radius:0 var(--radius) var(--radius) 0;padding:14px 18px;margin:16px 0;font-size:.96rem}
.callout strong{color:var(--secondary)}

footer.site{background:linear-gradient(135deg,var(--secondary) 0%,#450a0a 100%);color:#fecaca;padding:34px 0 22px;margin-top:60px}
footer.site a{color:#fecaca;text-decoration:none}
footer.site a:hover{color:#fff;text-decoration:underline}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:24px;margin-bottom:22px}
.foot-grid h4{color:#fff;margin:0 0 10px;font-size:1rem;letter-spacing:.3px}
.foot-grid ul{list-style:none;padding:0;margin:0}
.foot-grid ul li{padding:3px 0}
.foot-grid ul li::before{content:none}
.foot-bottom{border-top:1px solid rgba(254,202,202,.15);padding-top:14px;font-size:.86rem;color:#fecaca;display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px}

@media(max-width:980px){
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:700px){
  .hero{padding:38px 0 30px}
  h1{font-size:1.55rem}
  h2{font-size:1.22rem;padding:11px 12px 11px 14px}
  main{padding:22px 0}
  section{margin:24px 0}
  .foot-grid{grid-template-columns:1fr}
  .author-box{flex-direction:column;text-align:center;align-items:center}
  nav.primary ul{width:100%;justify-content:flex-start}
}

/* 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}}