:root{
  --ink:#070B10; --panel:#0D141B; --line:rgba(160,220,210,.12);
  --text:#E7F0EE; --muted:#90A4A1; --teal:#2EF2C9; --amber:#FFB84D; --violet:#8C7DFF;
  --display:"Alexandria","IBM Plex Sans Arabic",Tahoma,sans-serif;
  --body:"IBM Plex Sans Arabic","Segoe UI",Tahoma,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,Consolas,monospace;
  color-scheme:dark;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--ink);color:var(--text);font-family:var(--body);font-size:16px;line-height:1.9;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
a{color:var(--teal);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:2px solid var(--teal);outline-offset:3px;border-radius:6px}
.wrap{max-width:1100px;margin-inline:auto;padding-inline:20px}
header{position:sticky;top:env(safe-area-inset-top,0px);z-index:10;background:rgba(7,11,16,.8);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;justify-content:space-between;gap:16px;height:68px}
.logo{display:flex;align-items:center;gap:10px;font-family:var(--display);font-weight:800;font-size:20px;color:var(--text);direction:ltr}
.logo:hover{text-decoration:none}
.logo .mark{width:36px;height:36px;border-radius:11px;display:grid;place-items:center;background:conic-gradient(from 200deg,var(--teal),var(--violet),var(--amber),var(--teal));position:relative;font-size:14px}
.logo .mark::after{content:"";position:absolute;inset:3px;border-radius:9px;background:var(--ink)}
.logo .mark span{position:relative;z-index:1;color:var(--teal)}
.logo small{color:var(--muted);font-weight:400}
.back{font-size:14px;padding:9px 16px;border-radius:10px;border:1px solid var(--line);color:var(--text)}
.back:hover{border-color:var(--teal);color:var(--teal);text-decoration:none}
.hero{padding-block:56px 36px;border-bottom:1px solid var(--line);background:radial-gradient(circle at 85% 0%,rgba(46,242,201,.12),transparent 50%)}
.eyebrow{font-family:var(--body);font-weight:600;font-size:14px;color:var(--teal)}
h1{font-family:var(--display);font-size:clamp(30px,5vw,48px);margin:10px 0 12px;line-height:1.3;text-wrap:balance}
.meta{color:var(--muted);font-size:14px;display:flex;flex-wrap:wrap;gap:8px 20px}
.tabs{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}
.tabs a{font-size:14px;padding:7px 14px;border-radius:999px;border:1px solid var(--line);color:var(--muted)}
.tabs a[aria-current="page"]{background:rgba(46,242,201,.12);border-color:var(--teal);color:var(--teal)}
.tabs a:hover{text-decoration:none;color:var(--text)}
.layout{display:grid;grid-template-columns:240px 1fr;gap:48px;padding-block:44px 80px}
.toc{position:sticky;top:92px;align-self:start;display:grid;gap:2px;font-size:14px}
.toc b{font-family:var(--display);font-size:13px;color:var(--muted);margin-bottom:8px}
.toc a{color:var(--muted);padding:6px 12px;border-inline-start:2px solid var(--line)}
.toc a:hover{color:var(--teal);border-color:var(--teal);text-decoration:none}
article{max-width:70ch;min-width:0}
article h2{font-family:var(--display);font-size:22px;margin:40px 0 12px;display:flex;gap:12px;align-items:baseline;scroll-margin-top:90px}
article h2:first-child{margin-top:0}
article h2 span{font-family:var(--mono);font-size:13px;color:var(--amber)}
article p,article li{color:#C9D6D3}
article ul{padding-inline-start:22px;display:grid;gap:6px}
article li::marker{color:var(--teal)}
.note{padding:18px 20px;border-radius:14px;background:var(--panel);border:1px solid var(--line);border-inline-start:3px solid var(--amber);margin-block:20px}
.note p{margin:0}
table{width:100%;border-collapse:collapse;font-size:15px}
.tbl{overflow-x:auto;margin-block:16px;border:1px solid var(--line);border-radius:14px}
th,td{padding:12px 14px;text-align:start;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--panel);font-family:var(--display);font-weight:600;font-size:14px}
tr:last-child td{border-bottom:0}
td b{color:var(--teal)}
.contact-box{margin-top:40px;padding:24px;border-radius:18px;background:radial-gradient(circle at 10% 0%,rgba(46,242,201,.14),transparent 60%),var(--panel);border:1px solid var(--line);display:grid;gap:8px}
.contact-box b{font-family:var(--display);font-size:18px}
.num{font-family:var(--mono);direction:ltr;display:inline-block;user-select:all;color:var(--text)}
footer{border-top:1px solid var(--line);padding-block:26px;color:var(--muted);font-size:13px}
footer .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px}
footer nav{display:flex;flex-wrap:wrap;gap:18px}
footer a{color:var(--muted)}
footer a:hover{color:var(--teal)}
.wa{position:fixed;bottom:calc(22px + env(safe-area-inset-bottom,0px));left:22px;width:56px;height:56px;border-radius:50%;background:#25D366;display:grid;place-items:center;box-shadow:0 12px 30px -8px rgba(37,211,102,.6);z-index:20}
.wa svg{width:30px;height:30px}
@media (max-width:820px){.layout{grid-template-columns:1fr;gap:24px}.toc{position:static;grid-template-columns:1fr 1fr}.toc b{grid-column:1/-1}}
@media (max-width:480px){.toc{grid-template-columns:1fr}.back{padding:8px 12px}}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}