/* WSP Info — payments-focused site palette */
:root{
  --primary:#ea580c;
  --secondary:#9a3412;
  --accent:#1e40af;
  --bg:#ffffff;
  --surface:#fff7ed;
  --surface-alt:#ffedd5;
  --text:#7c2d12;
  --muted:#6b7280;
  --border:#fed7aa;
  --row-alt:#fff7ed;
  --radius:8px;
  --shadow:0 6px 22px rgba(154,52,18,.10);
  --shadow-lg:0 12px 36px rgba(30,64,175,.14);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.68;
  font-size:17px;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:underline;text-underline-offset:2px}
a:hover{color:var(--secondary)}
.container{max-width:1080px;margin:0 auto;padding:0 20px}

/* Header */
.site-header{
  position:sticky;top:0;z-index:50;
  background:linear-gradient(115deg,var(--primary) 0%,var(--secondary) 55%,var(--accent) 100%);
  color:#fff;
  box-shadow:var(--shadow);
  border-bottom:2px solid rgba(255,255,255,.22);
}
.site-header .container{display:flex;align-items:center;gap:18px;flex-wrap:wrap;padding-top:12px;padding-bottom:12px}
.brand{display:flex;align-items:center;gap:12px;color:#fff;text-decoration:none;font-weight:700;font-size:1.14rem;letter-spacing:.3px}
.brand img{width:36px;height:36px;background:#fff;border-radius:8px;padding:4px}
nav.primary{margin-left:auto;display:flex;flex-wrap:wrap;gap:6px}
nav.primary a{
  color:#fff;text-decoration:none;font-size:.94rem;
  padding:8px 12px;border-radius:6px;
  transition:background .18s ease;
}
nav.primary a:hover{background:rgba(255,255,255,.16)}

/* Hero */
.hero{
  background:
    radial-gradient(1200px 320px at 12% 0%,rgba(255,255,255,.35),transparent 60%),
    linear-gradient(135deg,var(--surface-alt) 0%,var(--surface) 55%,#fef3c7 100%);
  border-bottom:1px solid var(--border);
  padding:44px 0 34px;
}
.hero h1{
  font-size:clamp(1.8rem,3.4vw,2.55rem);
  line-height:1.18;
  margin:0 0 14px;
  color:var(--secondary);
  letter-spacing:-.01em;
}
.byline{
  color:var(--muted);font-size:.92rem;margin:0 0 16px;
}
.byline strong{color:var(--secondary)}
.lede p{margin:0 0 10px;font-size:1.06rem}
.cta-row{margin-top:18px;display:flex;gap:10px;flex-wrap:wrap}
.btn{
  display:inline-block;padding:11px 20px;border-radius:var(--radius);
  background:var(--primary);color:#fff;text-decoration:none;font-weight:600;
  border:2px solid transparent;transition:transform .12s ease,box-shadow .18s ease;
  box-shadow:0 4px 14px rgba(234,88,12,.28);
}
.btn:hover{transform:translateY(-1px);box-shadow:0 8px 22px rgba(234,88,12,.36);color:#fff}
.btn.secondary{background:transparent;color:var(--accent);border-color:var(--accent);box-shadow:none}
.btn.secondary:hover{background:var(--accent);color:#fff}

/* Main content */
main{padding:36px 0 56px}
main h2{
  font-size:1.42rem;
  color:var(--secondary);
  margin:36px 0 12px;
  padding:12px 16px;
  background:var(--surface);
  border-left:5px solid var(--primary);
  border-radius:0 var(--radius) var(--radius) 0;
}
main h3{color:var(--accent);margin-top:22px;font-size:1.1rem}
main p{margin:0 0 14px}

/* ToC */
nav.toc{
  background:var(--surface-alt);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:18px 22px;
  margin:22px 0 28px;
}
nav.toc h2{
  background:none;border:none;padding:0;margin:0 0 10px;font-size:1.05rem;color:var(--accent);
}
nav.toc ol{margin:0;padding-left:22px;columns:2;column-gap:26px}
@media(max-width:700px){nav.toc ol{columns:1}}
nav.toc a{color:var(--secondary);text-decoration:none}
nav.toc a:hover{text-decoration:underline}

/* Lists */
main ul{list-style:none;padding-left:0}
main ul li{
  padding:6px 0 6px 26px;position:relative;
}
main ul li::before{
  content:"›";
  position:absolute;left:6px;top:5px;
  color:var(--primary);font-weight:700;font-size:1.15rem;
}
main ol{counter-reset:step;list-style:none;padding-left:0}
main ol li{
  counter-increment:step;padding:8px 0 8px 44px;position:relative;
}
main ol li::before{
  content:counter(step);
  position:absolute;left:0;top:6px;
  width:28px;height:28px;border-radius:50%;
  background:var(--accent);color:#fff;font-weight:700;font-size:.88rem;
  display:flex;align-items:center;justify-content:center;
}

/* Tables */
.table-wrap{overflow-x:auto;margin:18px 0 22px;border:1px solid var(--border);border-radius:var(--radius)}
table{border-collapse:collapse;width:100%;min-width:520px;background:#fff}
thead th{
  background:linear-gradient(135deg,var(--primary),var(--secondary));
  color:#fff;text-align:left;padding:12px 14px;font-size:.94rem;
}
tbody td{padding:11px 14px;border-top:1px solid var(--border);font-size:.95rem}
tbody tr:nth-child(even) td{background:var(--row-alt)}

/* Callout / cards */
.callout{
  background:var(--surface);border:1px solid var(--border);
  border-left:5px solid var(--accent);
  padding:16px 18px;border-radius:var(--radius);margin:20px 0;
}
.card-grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));margin:18px 0}
.card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}
.card h3{margin-top:0;color:var(--secondary)}

/* Figures / SVG images */
figure{margin:22px 0;text-align:center}
figure svg{max-width:100%;height:auto;border-radius:var(--radius);background:var(--surface);border:1px solid var(--border);padding:14px}
figcaption{color:var(--muted);font-size:.88rem;margin-top:8px}

/* FAQ accordion */
details{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);padding:14px 16px;margin:10px 0;
  transition:background .18s ease;
}
details[open]{background:var(--surface-alt)}
summary{
  cursor:pointer;font-weight:600;color:var(--secondary);
  list-style:none;position:relative;padding-right:30px;
}
summary::-webkit-details-marker{display:none}
summary::after{
  content:"▼";position:absolute;right:2px;top:2px;
  color:var(--primary);transition:transform .22s ease;font-size:.9rem;
}
details[open] summary::after{transform:rotate(180deg)}

/* Author box */
.author-box{
  display:flex;gap:16px;align-items:flex-start;
  background:linear-gradient(115deg,var(--surface-alt),var(--surface));
  border:1px solid var(--border);border-radius:var(--radius);
  padding:18px 20px;margin:36px 0 8px;
}
.author-box img{width:72px;height:72px;border-radius:50%;flex:none;background:#fff;border:2px solid var(--primary)}
.author-box h3{margin:0 0 4px;color:var(--secondary)}
.author-box p{margin:0;font-size:.94rem;color:var(--text)}

/* Footer */
.site-footer{
  background:linear-gradient(135deg,var(--secondary),var(--accent));
  color:#fee2c9;padding:30px 0 22px;margin-top:34px;
}
.site-footer .container{display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;align-items:center}
.site-footer a{color:#fff}
.site-footer nav a{margin-right:14px;text-decoration:none;font-size:.94rem}
.site-footer nav a:hover{text-decoration:underline}
.site-footer .small{font-size:.82rem;opacity:.85;margin-top:12px;flex-basis:100%}

/* Breakpoints */
@media(max-width:980px){
  main h2{font-size:1.28rem}
  .hero{padding:36px 0 28px}
}
@media(max-width:700px){
  body{font-size:16px}
  nav.primary{width:100%;justify-content:flex-start}
  .brand{font-size:1rem}
  .author-box{flex-direction:column;align-items:center;text-align:center}
}

.toc-title{margin:0 0 10px;font-size:1.05rem;color:var(--accent);font-weight:700;letter-spacing:.02em}

/* 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}}