:root{--ink: #14181f;--muted: #5b6472;--line: #e4e7ec;--bg: #ffffff;--soft: #f5f7fa;--radius: 14px}@media(prefers-color-scheme:dark){:root{--ink: #e8ebf0;--muted: #a3acb9;--line: #2a313c;--bg: #0f1318;--soft: #161b22}}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Vazirmatn Variable,Tahoma,sans-serif;color:var(--ink);background:var(--bg);line-height:1.9;font-size:17px}a{color:var(--brand);text-decoration:none}h1,h2,h3{line-height:1.5;margin:0 0 .5em}h1{font-size:clamp(1.8rem,4.5vw,2.9rem);font-weight:800}h2{font-size:clamp(1.4rem,3vw,1.9rem);font-weight:750}h3{font-size:1.1rem;font-weight:700}p{margin:0 0 .8em}.wrap{max-width:1080px;margin:0 auto;padding:0 16px}.narrow{max-width:620px}.row{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}.block{padding:64px 16px}.band{background:var(--soft);border-block:1px solid var(--line)}.sub{color:var(--muted)}.topbar{position:sticky;top:0;z-index:10;background:color-mix(in 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