:root{--bg:#ffffff;--surface:#f5f7fb;--text:#0f172a;--muted:#475569;--line:#e2e8f0;--brand:#1d4ed8;--brand-ink:#ffffff;--max:1080px;--radius:14px}
@media (prefers-color-scheme:dark){:root{--bg:#0b1020;--surface:#121a2e;--text:#e5e9f2;--muted:#9aa6bd;--line:#223049;--brand:#6b9bff;--brand-ink:#0b1020}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans Arabic",sans-serif}
a{color:var(--brand)}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
header.site{border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;min-height:64px;gap:16px}
.brand{font-weight:700;font-size:20px;text-decoration:none;color:var(--text);letter-spacing:-.01em}
.brand span{color:var(--brand)}
nav.top a{margin-inline-start:20px;text-decoration:none;color:var(--muted);font-weight:500}
nav.top a:hover{color:var(--text)}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 20px;border-radius:10px;background:var(--brand);color:var(--brand-ink);text-decoration:none;font-weight:600}
.btn.ghost{background:transparent;color:var(--text);border:1px solid var(--line)}
.hero{padding:88px 0 64px}
.hero h1{font-size:clamp(32px,5vw,52px);line-height:1.1;margin:0 0 16px;letter-spacing:-.02em;max-width:760px}
.hero p{font-size:19px;color:var(--muted);max-width:640px;margin:0 0 28px}
.hero .actions{display:flex;gap:12px;flex-wrap:wrap}
section.block{padding:56px 0;border-top:1px solid var(--line)}
section.block h2{font-size:28px;margin:0 0 8px}
section.block .lead{color:var(--muted);margin:0 0 28px;max-width:680px}
.grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.card h3{margin:0 0 6px;font-size:17px}
.card p{margin:0;color:var(--muted);font-size:15px}
footer.site{border-top:1px solid var(--line);padding:32px 0;color:var(--muted);font-size:14px}
footer.site .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}
footer.site a{color:var(--muted);margin-inline-start:16px}
.doc{padding:48px 0 72px;max-width:780px}
.doc h1{font-size:36px;margin:0 0 4px}
.doc .meta{color:var(--muted);margin:0 0 32px}
.doc h2{font-size:22px;margin:40px 0 8px}
.doc h3{font-size:17px;margin:24px 0 6px}
.doc li{margin:4px 0}
.doc .note{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px}
.toc{columns:2;column-gap:32px;padding-inline-start:20px}
@media (max-width:640px){nav.top a:not(.btn){display:none}.toc{columns:1}}