:root{--ink:#111827;--muted:#5f6b7a;--line:#e5e7eb;--paper:#fff;--soft:#f7f8fa;--brand:#0ea5e9;--brand2:#2563eb;--night:#0b1220;--success:#059669;--radius:22px;--shadow:0 18px 55px rgba(15,23,42,.10)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--paper);line-height:1.6}a{color:inherit}.wrap{width:min(1160px,calc(100% - 40px));margin:0 auto}.topbar{background:#07101e;color:#cbd5e1;font-size:.86rem;text-align:center;padding:8px 16px}.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);backdrop-filter:blur(14px);border-bottom:1px solid rgba(229,231,235,.9)}.nav-shell{min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:11px;text-decoration:none;font-weight:850;letter-spacing:-.03em;font-size:1.18rem}.brand img{width:38px;height:38px}.brand 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