:root{--blue:#1a56db;--blue-dark:#1443ad;--blue-950:#102a56;--blue-50:#eff6ff;--blue-100:#dbeafe;--blue-200:#bfdbfe;--ink:#111827;--body:#334155;--muted:#64748b;--line:#e2e8f0;--soft:#f6f9ff;--card:#ffffff;--green:#047857;--green-bg:#ecfdf5;--radius:18px;--shadow:0 12px 34px rgba(18,50,92,.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#fff;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}.container{width:min(1120px,calc(100% - 40px));margin:0 auto;max-width:none;padding:0}.narrow{width:min(880px,calc(100% - 40px));margin:0 auto}.site-header{position:sticky;top:0;z-index:20;background:#fffffff5;border-bottom:1px solid 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