:root{
  --ink:#101622; --ink-soft:#54607a; --bg:#ffffff; --bg-alt:#f6f8fc; --line:#e7ebf3;
  --ember:#e8521f; --ember-deep:#c23d12;
  --sans:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  --display:'Space Grotesk',var(--sans);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.wrap{width:100%;max-width:800px;margin:0 auto;padding:0 24px}

nav{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.9);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
nav .wrap{display:flex;align-items:center;justify-content:space-between;height:68px;max-width:1080px}
.logo{font-family:var(--display);font-weight:700;font-size:20px;letter-spacing:-.3px;display:flex;align-items:center;gap:10px;color:#101622}
.logo .mark{width:28px;height:28px;flex-shrink:0}
.logo .brand-text span{color:var(--ember)}
.nav-links{display:flex;gap:26px;font-size:15px;font-weight:500;align-items:center}
.nav-links a{color:var(--ink-soft);transition:color .15s}
.nav-links a:hover,.nav-links a.on{color:var(--ink)}
.nav-cta{color:var(--ink)!important;font-weight:600}
@media(max-width:600px){.nav-links a:not(.nav-cta){display:none}}

.lhead{padding:58px 0 26px;border-bottom:1px solid var(--line)}
.lhead h1{font-family:var(--display);font-size:clamp(30px,5vw,42px);font-weight:700;letter-spacing:-1px}
.lhead .upd{color:var(--ink-soft);font-size:14px;margin-top:10px}

main{padding:14px 0 70px}
main h2{font-family:var(--display);font-size:20px;font-weight:700;letter-spacing:-.3px;margin:34px 0 12px}
main h3{font-size:16px;font-weight:700;margin:20px 0 6px}
main p{color:#3c465c;font-size:15.5px;margin-bottom:13px}
main ul{padding-left:22px;margin:0 0 14px}
main li{color:#3c465c;font-size:15.5px;margin-bottom:8px}
main a{color:var(--ember);font-weight:500}
main a:hover{text-decoration:underline}
main strong{color:var(--ink)}

.callout{background:var(--bg-alt);border:1px solid var(--line);border-left:3px solid var(--ember);border-radius:12px;padding:18px 20px;margin:20px 0}
.callout p{margin:0;font-size:14.5px;color:#3c465c}

.toc-note{font-size:14px;color:var(--ink-soft);margin-bottom:8px}

footer{border-top:1px solid var(--line);padding:30px 0;color:var(--ink-soft);font-size:13.5px}
footer .foot-row{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}
footer a{color:var(--ink-soft);transition:color .15s}
footer a:hover{color:var(--ink)}