:root{
  --primary:#1f2937;
  --secondary:#111827;
  --accent:#65a30d;
  --bg:#ffffff;
  --surface:#f9fafb;
  --surface-alt:#f3f4f6;
  --text:#111827;
  --muted:#6b7280;
  --border:#d1d5db;
  --row-alt:#f9fafb;
  --radius:4px;
  --shadow:0 1px 2px rgba(15,23,42,.06),0 4px 12px rgba(15,23,42,.05);
  --shadow-lg:0 12px 32px rgba(15,23,42,.10);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.65;
  font-size:16px;
  -webkit-text-size-adjust:100%;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--secondary);text-decoration:underline;text-underline-offset:2px}
a:hover{color:var(--accent)}

/* Header */
.site-header{
  background:var(--primary);
  color:#fff;
  border-bottom:4px solid var(--accent);
  position:sticky;
  top:0;
  z-index:20;
}
.header-inner{
  max-width:1140px;
  margin:0 auto;
  padding:14px 20px;
  display:flex;
  align-items:center;
  gap:16px;
  flex-wrap:wrap;
}
.brand{
  display:flex;
  align-items:center;
  gap:10px;
  color:#fff;
  text-decoration:none;
  font-weight:700;
}
.brand img{width:36px;height:36px;background:#fff;border-radius:var(--radius);padding:2px}
.brand-name{font-size:1.05rem;letter-spacing:.02em}
.brand-tag{color:#d1d5db;font-weight:400;font-size:.78rem;display:block}
.site-nav{margin-left:auto}
.site-nav ul{
  list-style:none;
  padding:0;margin:0;
  display:flex;
  gap:6px;
  flex-wrap:wrap;
}
.site-nav a{
  color:#f3f4f6;
  text-decoration:none;
  padding:8px 12px;
  border-radius:var(--radius);
  font-size:.94rem;
  font-weight:500;
}
.site-nav a:hover,.site-nav a[aria-current="page"]{
  background:var(--accent);
  color:#fff;
}

/* Hero */
.hero{
  background:
    radial-gradient(1200px 400px at 90% -20%,rgba(101,163,13,.28),transparent 60%),
    linear-gradient(140deg,var(--primary),var(--secondary));
  color:#fff;
  padding:56px 20px 48px;
  border-bottom:4px solid var(--accent);
}
.hero-inner{max-width:1140px;margin:0 auto}
.hero h1{
  font-size:clamp(1.85rem,4vw,2.6rem);
  line-height:1.15;
  margin:0 0 14px;
  font-weight:800;
  letter-spacing:-.01em;
}
.hero .lede{
  font-size:1.08rem;
  max-width:64ch;
  margin:0 0 16px;
  color:#e5e7eb;
}
.byline{
  color:#cbd5e1;
  font-size:.9rem;
  margin:0 0 22px;
}
.byline strong{color:#fff}
.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}
.btn{
  display:inline-block;
  padding:10px 18px;
  border-radius:var(--radius);
  font-weight:700;
  text-decoration:none;
  font-size:.95rem;
  border:2px solid transparent;
  transition:transform .15s;
}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--accent);color:#fff}
.btn-outline{border-color:#e5e7eb;color:#fff}
.btn-outline:hover{background:#ffffff14;color:#fff}

/* Container */
main{max-width:900px;margin:0 auto;padding:36px 20px 60px}
main.wide{max-width:1140px}
section{margin-bottom:36px}

/* Section headings */
h2{
  font-size:1.55rem;
  margin:44px 0 14px;
  padding:10px 14px 10px 16px;
  border-left:5px solid var(--accent);
  background:var(--surface);
  border-radius:0 var(--radius) var(--radius) 0;
  color:var(--secondary);
  line-height:1.3;
  scroll-margin-top:80px;
}
h3{
  font-size:1.15rem;
  margin:26px 0 8px;
  color:var(--secondary);
}
p{margin:0 0 14px}

/* Lists */
main ul{list-style:none;padding-left:0;margin:0 0 18px}
main ul li{
  position:relative;
  padding:6px 0 6px 26px;
  border-bottom:1px dashed var(--border);
}
main ul li:last-child{border-bottom:none}
main ul li::before{
  content:"\2192";
  color:var(--accent);
  font-weight:700;
  position:absolute;
  left:2px;top:6px;
}
main ol{list-style:none;padding-left:0;margin:0 0 18px;counter-reset:step}
main ol li{
  counter-increment:step;
  position:relative;
  padding:6px 0 6px 44px;
  min-height:32px;
}
main ol li::before{
  content:counter(step);
  position:absolute;
  left:0;top:4px;
  width:28px;height:28px;
  background:var(--accent);
  color:#fff;
  border-radius:50%;
  display:grid;place-items:center;
  font-size:.85rem;font-weight:700;
}

/* TOC */
nav.toc{
  background:var(--surface-alt);
  border:1px solid var(--border);
  border-left:5px solid var(--accent);
  padding:16px 18px;
  border-radius:var(--radius);
  margin:0 0 32px;
}
nav.toc h2{
  all:unset;
  display:block;
  font-weight:700;
  font-size:1rem;
  color:var(--secondary);
  margin-bottom:8px;
}
nav.toc ol{margin:0;padding-left:0}
nav.toc ol li{padding:3px 0 3px 32px;border:none}
nav.toc ol li::before{width:22px;height:22px;font-size:.72rem;top:6px}
nav.toc a{color:var(--secondary);text-decoration:none}
nav.toc a:hover{color:var(--accent);text-decoration:underline}

/* Tables */
.table-wrap{
  overflow-x:auto;
  border:1px solid var(--border);
  border-radius:var(--radius);
  margin:0 0 22px;
  background:#fff;
  box-shadow:var(--shadow);
}
table{width:100%;border-collapse:collapse;min-width:520px}
thead th{
  background:linear-gradient(135deg,var(--primary),var(--secondary));
  color:#fff;
  text-align:left;
  padding:12px 14px;
  font-size:.9rem;
  letter-spacing:.02em;
}
tbody td,tbody th{
  padding:10px 14px;
  border-top:1px solid var(--border);
  font-size:.95rem;
  vertical-align:top;
}
tbody tr:nth-child(even){background:var(--row-alt)}
tbody th{background:var(--surface-alt);text-align:left;font-weight:600}

/* Info blocks */
.callout{
  background:var(--surface);
  border-left:5px solid var(--accent);
  padding:14px 18px;
  border-radius:var(--radius);
  margin:0 0 22px;
}
.callout strong{color:var(--secondary)}

/* FAQ accordion */
details{
  border:1px solid var(--border);
  border-radius:var(--radius);
  margin:0 0 10px;
  background:#fff;
  box-shadow:var(--shadow);
}
details summary{
  cursor:pointer;
  padding:12px 44px 12px 16px;
  font-weight:600;
  color:var(--secondary);
  position:relative;
  list-style:none;
}
details summary::-webkit-details-marker{display:none}
details summary::after{
  content:"\25BC";
  position:absolute;
  right:16px;top:50%;
  transform:translateY(-50%);
  color:var(--accent);
  transition:transform .2s;
  font-size:.85rem;
}
details[open] summary::after{transform:translateY(-50%) rotate(180deg)}
details .a{padding:0 16px 14px;color:var(--text)}

/* Author box */
.author-box{
  margin-top:44px;
  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:20px;
  display:flex;
  gap:16px;
  align-items:flex-start;
}
.author-box img{
  width:72px;height:72px;
  border-radius:50%;
  background:var(--primary);
  flex-shrink:0;
}
.author-box h3{margin:0 0 4px;font-size:1.05rem}
.author-box .role{color:var(--muted);font-size:.85rem;margin:0 0 8px}
.author-box p{margin:0;font-size:.95rem}

/* SVG in content */
.figure{
  margin:22px 0;
  background:#fff;
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:8px;
  box-shadow:var(--shadow);
}
.figure figcaption{
  color:var(--muted);
  font-size:.85rem;
  padding:6px 8px 0;
}

/* Footer */
.site-footer{
  background:var(--secondary);
  color:#e5e7eb;
  padding:36px 20px 24px;
  border-top:4px solid var(--accent);
  margin-top:60px;
}
.footer-inner{
  max-width:1140px;
  margin:0 auto;
  display:grid;
  gap:24px;
  grid-template-columns:1fr 1fr 1fr;
}
.footer-inner h3{
  color:#fff;
  font-size:.9rem;
  margin:0 0 10px;
  letter-spacing:.05em;
  text-transform:uppercase;
}
.footer-inner ul{list-style:none;padding:0;margin:0}
.footer-inner ul li{padding:3px 0;border:none}
.footer-inner ul li::before{content:""}
.footer-inner a{color:#cbd5e1;text-decoration:none}
.footer-inner a:hover{color:var(--accent)}
.footer-bottom{
  max-width:1140px;
  margin:24px auto 0;
  padding-top:16px;
  border-top:1px solid #374151;
  color:#94a3b8;
  font-size:.8rem;
}

/* Responsive */
@media (max-width:980px){
  .footer-inner{grid-template-columns:1fr 1fr}
}
@media (max-width:700px){
  .header-inner{padding:10px 14px}
  .brand-name{font-size:1rem}
  .site-nav ul{gap:2px}
  .site-nav a{padding:6px 8px;font-size:.86rem}
  .hero{padding:36px 18px 32px}
  h2{font-size:1.3rem;padding:8px 10px 8px 12px}
  main{padding:24px 16px 40px}
  .footer-inner{grid-template-columns:1fr}
  .author-box{flex-direction:column}
  .author-box img{width:64px;height:64px}
}

/* 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}}