:root{--fs-sm:0.875rem;--fs-md:1rem;--fs-lg:1.375rem}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;font-size:var(--fs-md);color:#1f2937;background:#f8fafc;line-height:1.6}
.wrap{max-width:980px;margin:0 auto;padding:24px 16px 48px}
.card{background:#fff;border-radius:16px;border:1px solid #e5e7eb;box-shadow:0 8px 24px rgba(15,23,42,.06);padding:24px}
h1,h2,h3{margin:0;font-size:var(--fs-lg);line-height:1.25}
h1{margin-bottom:8px}
.lead{margin:0 0 24px;color:#475569;font-size:var(--fs-md)}
h2{margin:26px 0 10px}
h3{margin:16px 0 8px}
p{margin:0 0 10px;font-size:var(--fs-md)}
ul,ol{margin:0 0 10px;padding-left:22px;font-size:var(--fs-md)}
li{margin-bottom:6px}
.back-link{margin-top:20px;display:inline-block;color:#1d4ed8;font-size:var(--fs-md)}
.site-nav{margin-top:28px;padding-top:18px;border-top:1px solid #e5e7eb;display:flex;flex-wrap:wrap;gap:10px 16px;justify-content:center;font-size:var(--fs-sm)}
.site-nav a{font-weight:600;color:#1d4ed8}