:root{
  --bg:#ffffff;--ink:#141417;--ink2:#3c3c42;--muted:#7b7b83;
  --line:#e7e7ea;--soft:#f7f7f8;--soft2:#f0f0f2;--ink-hair:#dededf;
  --font-ar:'IBM Plex Sans Arabic','IBM Plex Sans',system-ui,'Segoe UI',sans-serif;
  --font-en:'IBM Plex Sans','IBM Plex Sans Arabic',system-ui,'Segoe UI',sans-serif;
  --wrap:760px;--ease:cubic-bezier(.22,.61,.36,1);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{background:var(--bg);color:var(--ink);font-family:var(--font-ar);
  font-size:17px;line-height:1.85;font-weight:400;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
html[lang="en"] body{font-family:var(--font-en);line-height:1.75}
.wrap{max-width:var(--wrap);margin-inline:auto;padding-inline:22px}

/* header */
.site-head{border-block-end:1px solid var(--line);position:sticky;top:0;background:rgba(255,255,255,.92);
  backdrop-filter:saturate(1.4) blur(10px);z-index:50}
.site-head .bar{display:flex;align-items:center;justify-content:space-between;gap:16px;
  min-height:64px;max-width:1180px;margin-inline:auto;padding-inline:22px}
.site-head img{height:26px;width:auto;display:block}
.head-links{display:flex;align-items:center;gap:18px;font-size:14px}
.head-links a{color:var(--ink2);text-decoration:none;transition:color .2s var(--ease)}
.head-links a:hover{color:var(--ink)}
.lang-switch{border:1px solid var(--line);border-radius:999px;padding:5px 14px;font-size:13px;
  color:var(--ink);text-decoration:none;transition:background .2s var(--ease)}
.lang-switch:hover{background:var(--soft)}

/* breadcrumb */
.crumb{font-size:13.5px;color:var(--muted);margin-block:30px 14px}
.crumb a{color:var(--muted);text-decoration:none}
.crumb a:hover{color:var(--ink);text-decoration:underline}
.crumb span{margin-inline:7px;opacity:.55}

/* article */
article{padding-block-end:40px}
h1{font-size:clamp(28px,4.4vw,40px);line-height:1.32;font-weight:600;letter-spacing:-.01em;
  margin-block-end:16px}
.standfirst{font-size:18.5px;color:var(--ink2);line-height:1.8;
  padding-block-end:26px;border-block-end:1px solid var(--line);margin-block-end:34px}
article h2{font-size:24px;font-weight:600;line-height:1.4;margin-block:42px 14px}
article h3{font-size:20.5px;font-weight:600;line-height:1.45;margin-block:38px 12px}
article h4{font-size:17.5px;font-weight:600;margin-block:26px 8px}
article p{margin-block-end:18px}
article strong{font-weight:600;color:var(--ink)}
article a{color:var(--ink);text-decoration:underline;text-underline-offset:3px;
  text-decoration-color:var(--ink-hair);transition:text-decoration-color .2s var(--ease)}
article a:hover{text-decoration-color:var(--ink)}
article ul,article ol{margin-block-end:20px;padding-inline-start:22px}
article li{margin-block-end:9px}
article li::marker{color:var(--muted)}
article hr{border:0;border-block-start:1px solid var(--line);margin-block:34px}
article code{background:var(--soft2);padding:2px 6px;border-radius:5px;font-size:.88em;
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;direction:ltr;display:inline-block}
article pre{background:var(--soft);border:1px solid var(--line);border-radius:12px;
  padding:16px 18px;overflow-x:auto;margin-block-end:22px;direction:ltr;text-align:left}
article pre code{background:none;padding:0;font-size:13px;line-height:1.65;display:block}
article blockquote{border-inline-start:3px solid var(--ink-hair);padding-inline-start:18px;
  color:var(--ink2);margin-block-end:20px}

/* checklists */
article li.chk{list-style:none;margin-inline-start:-22px;padding-inline-start:28px;position:relative}
article li.chk::before{content:"";position:absolute;inset-inline-start:0;top:.55em;
  width:15px;height:15px;border:1.5px solid var(--ink-hair);border-radius:4px}

/* comparison tables */
table{width:100%;border-collapse:collapse;margin-block-end:24px;font-size:15.5px}
th,td{padding:11px 14px;border-block-end:1px solid var(--line);text-align:start;vertical-align:top}
thead th{border-block-end:2px solid var(--ink-hair);font-weight:600;white-space:nowrap}
@media(max-width:700px){
  table,thead,tbody,tr,th,td{display:block}
  thead{display:none}
  tr{border-block-end:1px solid var(--line);padding-block:10px}
  td{border:0;padding:4px 0}
}

/* notice */
.notice{background:var(--soft);border:1px solid var(--line);border-radius:14px;
  padding:16px 18px;font-size:14.5px;color:var(--ink2);line-height:1.7;margin-block:36px 0}
.notice b{color:var(--ink);font-weight:600}

/* related */
.related{margin-block-start:44px;padding-block-start:30px;border-block-start:1px solid var(--line)}
.related h2{font-size:15px;font-weight:600;color:var(--muted);margin:0 0 16px;
  letter-spacing:.02em;text-transform:none}
.related ul{list-style:none;padding:0;margin:0;display:grid;gap:10px}
.related li{margin:0}
.related a{display:block;padding:13px 16px;border:1px solid var(--line);border-radius:12px;
  text-decoration:none;color:var(--ink);font-size:15.5px;transition:background .2s var(--ease),border-color .2s var(--ease)}
.related a:hover{background:var(--soft);border-color:var(--ink-hair)}

/* cta */
.cta-box{margin-block-start:40px;padding:26px 24px;border:1px solid var(--line);
  border-radius:16px;background:var(--soft)}
.cta-box p{margin:0 0 14px;color:var(--ink2)}
.cta-box a{display:inline-block;background:var(--ink);color:#fff;text-decoration:none;
  padding:11px 22px;border-radius:999px;font-size:15px;font-weight:500}

/* index pages */
.idx-head{margin-block:44px 34px}
.idx-head h1{margin-block-end:12px}
.idx-head p{color:var(--ink2);font-size:18px;max-width:62ch}
.track-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px;
  margin-block-end:56px}
.track-card{display:block;padding:22px;border:1px solid var(--line);border-radius:16px;
  text-decoration:none;color:var(--ink);transition:background .2s var(--ease),border-color .2s var(--ease)}
.track-card:hover{background:var(--soft);border-color:var(--ink-hair)}
.track-card b{display:block;font-size:18px;font-weight:600;margin-block-end:5px}
.track-card span{font-size:14px;color:var(--muted)}
.art-list{list-style:none;padding:0;margin:0 0 56px;display:grid;gap:12px}
.art-list a{display:block;padding:18px 20px;border:1px solid var(--line);border-radius:14px;
  text-decoration:none;color:var(--ink);transition:background .2s var(--ease),border-color .2s var(--ease)}
.art-list a:hover{background:var(--soft);border-color:var(--ink-hair)}
.art-list b{display:block;font-weight:600;font-size:17px;margin-block-end:6px;line-height:1.45}
.art-list span{display:block;font-size:14.5px;color:var(--muted);line-height:1.65}

/* footer */
.site-foot{border-block-start:1px solid var(--line);margin-block-start:60px;padding-block:30px 46px;
  font-size:14px;color:var(--muted)}
.site-foot .bar{display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;
  max-width:1180px;margin-inline:auto;padding-inline:22px}
.site-foot a{color:var(--muted);text-decoration:none}
.site-foot a:hover{color:var(--ink)}