:root{
  --bg:#F7F8FA;--card:#FFFFFF;--text:#111827;--soft:#667085;--muted:#98A2B3;
  --border:#E6E9EF;--accent:#1769FF;--accent2:#0B5AE0;--accent-soft:#EEF4FF;
  --navy:#07162F;--green:#11875D;--green-soft:#EAF8F2;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;-webkit-font-smoothing:antialiased}
a{color:inherit}
.header-shell{position:sticky;top:0;z-index:20;background:rgba(247,248,250,.94);backdrop-filter:blur(14px);border-bottom:1px solid var(--border)}
header{max-width:1040px;margin:auto;height:68px;padding:0 24px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none}
.brand-mark{font-family:"Inter Tight",Inter,sans-serif;font-size:29px;font-weight:700;letter-spacing:-.07em;color:var(--navy)}
.brand-mark .plus{color:var(--accent)}
.brand-text{font-size:12px;color:var(--soft);line-height:1.15;border-left:1px solid var(--border);padding-left:12px}
nav{display:flex;align-items:center;gap:20px}
nav a{font-size:13px;color:var(--soft);font-weight:500;text-decoration:none}
nav a:hover,nav a.active{color:var(--text)}
main{max-width:880px;margin:auto;padding:64px 24px 90px}
.kicker{display:inline-flex;background:var(--accent-soft);color:var(--accent2);border-radius:999px;padding:7px 10px;font-size:12px;font-weight:650;margin-bottom:15px}
h1{font-family:"Inter Tight",Inter,sans-serif;font-size:clamp(36px,6vw,52px);line-height:1.03;letter-spacing:-.045em;margin:0 0 16px}
.lead{font-size:17px;line-height:1.65;color:var(--soft);max-width:720px;margin:0 0 13px}
.updated{font-size:11.5px;color:var(--muted);margin-top:15px}
.content{margin-top:42px}
.card{background:#fff;border:1px solid var(--border);border-radius:18px;padding:27px;margin:0 0 13px}
.card h2{font-family:"Inter Tight",Inter,sans-serif;font-size:22px;letter-spacing:-.025em;margin:0 0 12px}
.card h3{font-size:14.5px;margin:22px 0 8px}
.card p,.card li{font-size:13.5px;line-height:1.75;color:var(--soft)}
.card p{margin:0 0 12px}
.card p:last-child{margin-bottom:0}
.card strong{color:var(--text)}
.card ul{padding-left:20px;margin:8px 0 0}
.callout{background:var(--accent-soft);border:1px solid #DBE7FF;border-radius:14px;padding:16px 18px;font-size:13px;line-height:1.65;color:#405574;margin:18px 0}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:13px;margin:13px 0}
.mini{background:#fff;border:1px solid var(--border);border-radius:16px;padding:20px}
.mini b{display:block;font-size:13.5px;margin-bottom:7px}
.mini p{font-size:12.5px;color:var(--soft);line-height:1.6;margin:0}
.formula{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:#F7F8FA;border:1px solid var(--border);padding:12px 14px;border-radius:11px;font-size:12px;color:#344054;overflow:auto}
.table-wrap{overflow-x:auto;margin-top:12px}
table{width:100%;border-collapse:collapse;min-width:620px}
th,td{text-align:left;vertical-align:top;border-bottom:1px solid var(--border);padding:12px 10px;font-size:12.5px;line-height:1.55}
th{font-size:11px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted)}
td{color:var(--soft)}
td:first-child{font-weight:650;color:var(--text)}
.page-links{display:flex;flex-wrap:wrap;gap:8px;margin-top:26px}
.page-links a{background:#fff;border:1px solid var(--border);border-radius:10px;padding:9px 11px;font-size:12px;text-decoration:none;color:var(--soft)}
footer{background:#fff;border-top:1px solid var(--border);padding:28px 24px 40px}
.footer-inner{max-width:1040px;margin:auto;display:flex;justify-content:space-between;gap:20px}
.footer-copy{font-size:11.5px;color:var(--muted);line-height:1.6;max-width:520px}
.footer-links{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px 16px}
.footer-links a{font-size:11.5px;color:var(--soft);text-decoration:none}
@media(max-width:700px){
  header{padding:0 16px}
  .brand-text{display:none}
  nav{gap:11px}
  nav a{font-size:12px}
  nav a:nth-child(3){display:none}
  main{padding:44px 17px 70px}
  .grid{grid-template-columns:1fr}
  .card{padding:21px}
  .footer-inner{display:block}
  .footer-links{justify-content:flex-start;margin-top:15px}
}