:root{--bg:#fff;--surface:#f6f7f9;--surface-strong:#eef0f3;--ink:#101114;--muted:#667085;--line:#e5e7eb;--brand:#df2d2d;--brand-dark:#af1c1c;--blue:#2458ff;--radius:8px;--shadow:0 20px 70px #10111414}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--ink);letter-spacing:0;margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}.site-header{z-index:20;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#ffffffdb;border-bottom:1px solid #e5e7ebcc;grid-template-columns:1fr auto 1fr;align-items:center;gap:24px;height:76px;padding:0 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