/* Mathkari Concepts — public learn pages. Standalone; nothing here touches the portal app. */
*{box-sizing:border-box;margin:0;padding:0}
:root{
  --gold:#d4a017; --gold-lt:#f5c842; --ink:#1f2937; --ink-soft:#4b5563;
  --line:#e5e7eb; --bg:#ffffff; --bg-soft:#f8fafc; --accent:#6d28d9;
}
html{-webkit-text-size-adjust:100%}
body{background:var(--bg);color:var(--ink);
  font:400 17px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
.wrap{max-width:760px;margin:0 auto;padding:0 16px}

/* header */
header.site{background:#070707;background-image:
  radial-gradient(700px 320px at 8% -20%,rgba(212,160,23,.28),transparent 62%);
  padding:18px 0}
header.site .wrap{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
header.site a.brand{display:flex;align-items:center;gap:11px;text-decoration:none}
header.site .mark{width:40px;height:40px;border-radius:50%;background:var(--gold-lt);object-fit:cover;
  color:#231a05;font-weight:800;font-size:21px;display:flex;align-items:center;justify-content:center;flex:none}
header.site .nm{color:var(--gold-lt);font-weight:800;font-size:19px;line-height:1.15}
header.site .tag{color:#a3a3a3;font-size:12.5px;font-style:italic}
header.site nav{margin-left:auto;display:flex;gap:16px;flex-wrap:wrap}
header.site nav a{color:#e8e8e8;text-decoration:none;font-size:14.5px;font-weight:600}
header.site nav a:hover{color:var(--gold-lt)}

/* breadcrumb */
.crumb{font-size:14px;color:var(--ink-soft);padding:16px 0 0}
.crumb a{color:var(--ink-soft)}
.crumb a:hover{color:var(--gold)}

main{padding:8px 0 48px}
h1{font-size:clamp(27px,5.4vw,38px);line-height:1.2;font-weight:800;letter-spacing:-.5px;margin:18px 0 12px}
h2{font-size:clamp(21px,3.6vw,26px);line-height:1.28;font-weight:800;margin:36px 0 12px}
h3{font-size:18.5px;font-weight:700;margin:24px 0 8px}
p{margin:0 0 15px}
.lede{font-size:19px;color:var(--ink-soft)}
ul,ol{margin:0 0 16px 22px}
li{margin:0 0 8px}
a{color:#b45309}
strong{font-weight:700}
.meta{font-size:13.5px;color:#6b7280;border-bottom:1px solid var(--line);padding-bottom:16px;margin-bottom:8px}

/* table */
.tbl-wrap{overflow-x:auto;margin:0 0 18px}
table{border-collapse:collapse;width:100%;min-width:420px;font-size:16px}
caption{text-align:left;font-size:14px;color:#6b7280;padding:0 0 8px}
th,td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
thead th{background:var(--bg-soft);font-weight:700}
tbody th{font-weight:600}
td.num{white-space:nowrap}
@media(max-width:560px){
  table{min-width:0;font-size:14px}
  th,td{padding:8px 7px}
  td.num{white-space:normal}
}

/* callouts */
.note{background:var(--bg-soft);border-left:4px solid var(--accent);border-radius:0 8px 8px 0;
  padding:14px 16px;margin:0 0 20px;font-size:16px}
.note b{color:var(--accent)}
.work{background:#fffbeb;border:1px solid #f3d99b;border-radius:10px;padding:16px 18px;margin:0 0 20px}
.work .step{margin:0 0 7px}
.work .ans{font-weight:800;color:#047857;margin-top:6px}
.ink{color:#dc2626;font-weight:700}

/* CTA */
.cta{background:#070707;background-image:
  radial-gradient(620px 300px at 100% 0,rgba(212,160,23,.22),transparent 60%);
  border-radius:16px;padding:26px 24px;margin:40px 0 8px;color:#f3f3f3}
.cta h2{color:var(--gold-lt);margin:0 0 10px;font-size:23px}
.cta p{color:#d4d4d4;font-size:16px}
.cta .btns{display:flex;gap:11px;flex-wrap:wrap;margin-top:16px}
.cta .b{display:inline-block;background:var(--gold-lt);color:#231a05;text-decoration:none;
  font-weight:800;font-size:16px;padding:12px 20px;border-radius:999px}
.cta .b.alt{background:transparent;color:var(--gold-lt);box-shadow:inset 0 0 0 2px var(--gold-lt)}

/* related */
.related{border-top:1px solid var(--line);margin-top:40px;padding-top:24px}
.related h2{margin-top:0;font-size:20px}
.cards{display:grid;gap:12px;grid-template-columns:1fr}
@media(min-width:620px){.cards{grid-template-columns:1fr 1fr}}
.cards a{display:block;border:1px solid var(--line);border-radius:12px;padding:15px 16px;
  text-decoration:none;color:var(--ink)}
.cards a:hover{border-color:var(--gold);background:var(--bg-soft)}
.cards .t{display:block;font-weight:700;font-size:16.5px;line-height:1.35;margin-bottom:5px}
.cards .d{display:block;font-size:14.5px;color:var(--ink-soft);line-height:1.5}

footer.site{border-top:1px solid var(--line);padding:26px 0 40px;font-size:14.5px;color:var(--ink-soft)}
footer.site .row{display:flex;gap:18px;flex-wrap:wrap;align-items:center}
footer.site a{color:var(--ink-soft)}