:root{
  --bg:#f7f8fa;--surface:#ffffff;--text:#1f2933;--muted:#5b6775;--border:#e2e6ea;
  --primary:#0b5cad;--primary-soft:#e8f1fb;--accent:#0f8a5f;--warn-bg:#fff7e6;--warn:#9a5b00;
  --danger-bg:#fdecec;--danger:#b42318;--code-bg:#f1f3f5;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#0f1419;--surface:#171d24;--text:#e6e9ed;--muted:#9aa5b1;--border:#2a323c;
    --primary:#5aa9f5;--primary-soft:#14273b;--accent:#3cc48f;--warn-bg:#2b2210;--warn:#f0b851;
    --danger-bg:#2d1515;--danger:#f2817a;--code-bg:#202831;
  }
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:"Cairo","Segoe UI",Tahoma,Arial,sans-serif;line-height:1.85;font-size:17px}
a{color:var(--primary)}
.skip{position:absolute;right:-9999px}
.skip:focus{right:16px;top:8px;background:var(--surface);padding:8px 12px;z-index:10}
header.site{background:var(--surface);border-bottom:1px solid var(--border)}
header.site .inner,main,footer.site .inner{max-width:1040px;margin:0 auto;padding:0 16px}
header.site .inner{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:60px;flex-wrap:wrap}
.brand{font-weight:800;font-size:1.15rem;text-decoration:none;color:var(--text)}
.brand span{color:var(--primary)}
nav.top ul{list-style:none;display:flex;flex-wrap:wrap;gap:4px 14px;margin:0;padding:0;font-size:.92rem}
nav.top a{text-decoration:none;color:var(--muted)}
nav.top a[aria-current="page"],nav.top a:hover{color:var(--primary)}
.breadcrumb{font-size:.88rem;color:var(--muted);margin:18px 0 0;padding:0;list-style:none;display:flex;flex-wrap:wrap;gap:6px}
.breadcrumb li+li::before{content:"‹";margin-left:6px;color:var(--muted)}
.breadcrumb a{color:var(--muted)}
h1{font-size:2rem;line-height:1.4;margin:14px 0 8px}
h2{font-size:1.45rem;margin:40px 0 12px;padding-bottom:6px;border-bottom:2px solid var(--primary-soft)}
h3{font-size:1.15rem;margin:26px 0 8px}
.lead{font-size:1.1rem;color:var(--muted);margin-top:0}
.toc{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:14px 18px;margin:22px 0}
.toc strong{display:block;margin-bottom:6px}
.toc ol{margin:0;padding-right:20px;columns:2;column-gap:28px}
@media (max-width:640px){.toc ol{columns:1}h1{font-size:1.6rem}}
.table-wrap{overflow-x:auto;margin:12px 0}
table{width:100%;border-collapse:collapse;background:var(--surface);font-size:.95rem}
th,td{border:1px solid var(--border);padding:8px 10px;text-align:right;vertical-align:top}
th{background:var(--primary-soft)}
kbd{font-family:Consolas,monospace;background:var(--code-bg);border:1px solid var(--border);border-bottom-width:2px;border-radius:5px;padding:1px 7px;font-size:.88em;white-space:nowrap}
code{background:var(--code-bg);padding:1px 6px;border-radius:4px;font-size:.9em}
.ui{font-weight:700;color:var(--primary)}
.note,.warn,.tip{border-radius:10px;padding:12px 16px;margin:16px 0;border-right:4px solid}
.tip{background:var(--primary-soft);border-color:var(--primary)}
.note{background:var(--surface);border-color:var(--accent)}
.warn{background:var(--warn-bg);border-color:var(--warn)}
.msg{background:var(--danger-bg);color:var(--danger);padding:1px 6px;border-radius:4px}
ol.steps{counter-reset:s;list-style:none;padding:0}
ol.steps>li{counter-increment:s;position:relative;padding:4px 44px 10px 0}
ol.steps>li::before{content:counter(s);position:absolute;right:0;top:4px;width:30px;height:30px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.9rem}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;margin:24px 0}
.card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:18px;text-decoration:none;color:var(--text);display:block;transition:border-color .2s}
.card:hover{border-color:var(--primary)}
.card h2,.card h3{font-size:1.15rem;border:0;margin:0 0 6px;padding:0;color:var(--primary)}
.card p{margin:0;color:var(--muted);font-size:.95rem}
details{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:10px 16px;margin:10px 0}
summary{cursor:pointer;font-weight:700}
.related{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:14px 18px;margin:36px 0}
footer.site{border-top:1px solid var(--border);margin-top:48px;padding:20px 0;color:var(--muted);font-size:.9rem;background:var(--surface)}