:root{--fs-sm:0.875rem;--fs-md:1rem;--fs-lg:1.375rem}
body{margin:0;font-family:"Segoe UI",system-ui,-apple-system,"Roboto",sans-serif;font-size:var(--fs-md);background:#f4f7fb;color:#1f2a44;line-height:1.55}
.wrap{max-width:920px;margin:28px auto;padding:0 16px}
.card{background:#fff;border-radius:18px;box-shadow:0 10px 28px rgba(0,0,0,.08);padding:26px 22px}
h1,h2,h3{font-size:var(--fs-lg);line-height:1.2}
h1{margin:0 0 8px}
h2{margin:22px 0 10px}
h3{margin:16px 0 6px}
p,li{font-size:var(--fs-md)}
p{margin:8px 0}
ul{margin:8px 0 8px 22px}
li{margin:4px 0}
a{color:#2a5298}
.muted{color:#5a6a85;font-size:var(--fs-md)}
.back{display:inline-block;margin-top:20px;text-decoration:none;color:#2a5298;font-weight:600;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}