:root{
  --bg:#f7f6f2; --ink:#16181d; --muted:#5b616c; --line:#dcdad2;
  --accent:#b3261e; --card:#ffffff;
}
@media (prefers-color-scheme: dark){
  :root{ --bg:#121418; --ink:#ecebe6; --muted:#a3a8b2; --line:#2a2e36; --accent:#ff6b5e; --card:#1a1d23; }
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:var(--accent)}
.shell{max-width:920px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px}
.skip:focus{left:12px;top:12px;background:var(--card);padding:8px 12px;z-index:10}

.topbar{border-bottom:1px solid var(--line)}
.topbar__inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:16px;padding-bottom:16px;flex-wrap:wrap}
.brand{font-weight:800;font-size:1.25rem;letter-spacing:-.01em;color:var(--ink);text-decoration:none}
.brand span{color:var(--accent)}
.nav{display:flex;gap:20px;flex-wrap:wrap}
.nav a{color:var(--ink);text-decoration:none;font-size:.95rem}
.nav a:hover{color:var(--accent)}

.hero{padding:64px 0 40px}
.kicker{text-transform:uppercase;letter-spacing:.12em;font-size:.78rem;font-weight:700;color:var(--accent);margin:0 0 12px}
h1{font-size:clamp(2rem,5vw,3.2rem);line-height:1.1;letter-spacing:-.02em;margin:0 0 20px}
.lead{font-size:1.2rem;color:var(--muted);max-width:640px;margin:0}

.section{padding:40px 0;border-top:1px solid var(--line)}
.section h2{font-size:1.5rem;margin:0 0 16px;letter-spacing:-.01em}
.steps{counter-reset:s;list-style:none;padding:0;margin:0;display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.steps li{counter-increment:s;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:18px}
.steps li::before{content:counter(s);display:block;font-weight:800;color:var(--accent);margin-bottom:6px}
.steps strong{display:block;margin-bottom:4px}
.steps span{color:var(--muted);font-size:.95rem}
.list{padding-left:1.2rem}
.list li{margin:8px 0}

.prose{padding:40px 0 20px}
.prose h1{font-size:2rem}
.prose h2{font-size:1.2rem;margin-top:2rem}

.footer{border-top:1px solid var(--line);margin-top:40px;padding:24px 0;font-size:.9rem;color:var(--muted)}
.footer__inner{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
.footer a{color:var(--muted)}
code.out{display:block;word-break:break-all;background:var(--card);border:1px solid var(--line);padding:12px;border-radius:6px}