:root{
  --ink:#0f1b2d;
  --ink-soft:#3b475c;
  --bg:#fbfcfd;
  --paper:#ffffff;
  --rule:#e3e8ef;
  --accent:#0f5f63;
  --accent-soft:#e6f2f3;
  --warn:#7a4a00;
  --max:72ch;
}
*{box-sizing:border-box}
html{font-size:16px;scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,system-ui,sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
.wrap{max-width:980px;margin:0 auto;padding:0 1.25rem}
main.wrap{padding-top:2rem;padding-bottom:3rem}
a{color:var(--accent);text-decoration:underline;text-underline-offset:2px}
a:hover{text-decoration-thickness:2px}
h1,h2,h3,h4{font-weight:650;letter-spacing:-0.01em;color:var(--ink);line-height:1.25}
h1{font-size:clamp(1.8rem,4vw,2.5rem);margin:.2rem 0 1rem}
h2{font-size:1.4rem;margin:2rem 0 .6rem;border-top:1px solid var(--rule);padding-top:1.5rem}
h3{font-size:1.1rem;margin:1.4rem 0 .4rem}
p{margin:0 0 1rem;max-width:var(--max)}
ul,ol{max-width:var(--max);margin:0 0 1rem;padding-left:1.4rem}
li{margin:.3rem 0}
.skip{position:absolute;left:-9999px}
.skip:focus{left:1rem;top:1rem;background:var(--accent);color:#fff;padding:.5rem .75rem;border-radius:.25rem;z-index:100}

header.site{background:var(--paper);border-bottom:1px solid var(--rule);position:sticky;top:0;z-index:10}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;min-height:60px;gap:1rem}
.brand{font-weight:700;font-size:1.1rem;letter-spacing:-0.01em;color:var(--ink);text-decoration:none}
.brand span{color:var(--accent);font-weight:500}
nav ul{list-style:none;margin:0;padding:0;display:flex;gap:1.1rem;flex-wrap:wrap}
nav a{color:var(--ink-soft);text-decoration:none;font-size:.95rem}
nav a:hover{color:var(--accent)}
.menu-btn{display:none;background:none;border:1px solid var(--rule);padding:.4rem .7rem;border-radius:.3rem;font-size:.9rem;cursor:pointer;color:var(--ink)}

footer.site{border-top:1px solid var(--rule);padding:2rem 0;background:var(--paper);margin-top:3rem}
footer.site p{color:var(--ink-soft);font-size:.92rem;max-width:none}
footer.site .fine{font-size:.82rem;color:var(--ink-soft);margin-top:.5rem}

.lede{font-size:1.15rem;color:var(--ink-soft);max-width:var(--max);margin:0 0 1.5rem}
.note{background:var(--accent-soft);border-left:3px solid var(--accent);padding:.9rem 1rem;border-radius:.25rem;margin:1.25rem 0;max-width:var(--max)}
.note strong{color:var(--ink)}

.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1rem;margin:1.5rem 0}
.card{background:var(--paper);border:1px solid var(--rule);border-radius:.5rem;padding:1.1rem 1.1rem 1.2rem}
.card h3{margin-top:0;font-size:1rem}
.card p{font-size:.95rem;color:var(--ink-soft);margin-bottom:.6rem}
.card a{font-size:.92rem}

table.compare{width:100%;border-collapse:collapse;margin:1.5rem 0;font-size:.95rem;background:var(--paper);border:1px solid var(--rule);border-radius:.5rem;overflow:hidden}
table.compare th,table.compare td{padding:.7rem .9rem;text-align:left;border-bottom:1px solid var(--rule);vertical-align:top}
table.compare th{background:var(--accent-soft);font-weight:600;color:var(--ink)}
table.compare tr:last-child td{border-bottom:none}

figure.diagram{margin:1.5rem 0;text-align:center}
figure.diagram svg{max-width:100%;height:auto;background:var(--paper);border:1px solid var(--rule);border-radius:.5rem;padding:1rem}
figure.diagram figcaption{font-size:.88rem;color:var(--ink-soft);margin-top:.5rem}

.cite-list{list-style:none;padding:0;max-width:none}
.cite-list li{padding:1rem 0;border-bottom:1px solid var(--rule);margin:0}
.cite-list .meta{font-size:.85rem;color:var(--ink-soft);margin-top:.3rem;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.cite-list .finding{margin-top:.5rem;color:var(--ink-soft);font-size:.95rem}

details.faq{border-bottom:1px solid var(--rule);padding:.9rem 0}
details.faq summary{font-weight:600;cursor:pointer;font-size:1.02rem;color:var(--ink);list-style:none}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::before{content:"+ ";color:var(--accent);font-weight:700}
details.faq[open] summary::before{content:"– "}
details.faq p{margin:.7rem 0 0;color:var(--ink-soft)}

@media (max-width:680px){
  .menu-btn{display:inline-block}
  nav ul{display:none;flex-direction:column;width:100%;background:var(--paper);position:absolute;left:0;top:60px;border-bottom:1px solid var(--rule);padding:1rem 1.25rem;gap:.8rem}
  nav ul.open{display:flex}
  header.site .wrap{flex-wrap:wrap}
  table.compare,table.compare tbody,table.compare tr,table.compare td,table.compare th{display:block}
  table.compare th{display:none}
  table.compare td{padding:.5rem 0;border:none}
  table.compare td::before{content:attr(data-label) " — ";font-weight:600;color:var(--ink)}
  table.compare tr{border-bottom:1px solid var(--rule);padding:.6rem 0}
}