:root{--accent:#3B82F6;--accent-dark:#2563EB;--accent-light:#EFF6FF;--text-primary:#111827;--text-secondary:#4B5563;--text-muted:#6B7280;--border-color:#E5E7EB;--bg:#FFFFFF;--card-bg:#FFFFFF;--shadow:0 1px 3px rgba(17,24,39,0.06),0 1px 2px rgba(17,24,39,0.04);--shadow-hover:0 4px 12px rgba(17,24,39,0.08);--radius:14px;--max-width:900px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;color:var(--text-primary);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased}a{color:var(--accent);text-decoration:none}a:focus-visible,a:hover{text-decoration:underline}a:focus-visible,button:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}img,svg{max-width:100%}header.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:saturate(180%) 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