:root{--red:rgb(213,5,5);--red-dark:rgb(176,0,0);--red-soft:#fff1f1;--text:#151515;--muted:#666;--line:#e9e9e9;--bg:#f6f7f9;--card:#fff;--shadow:0 12px 30px rgba(20,20,20,.06);--radius:18px}.site-header,header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}.container{max-width:1220px;margin:0 auto;padding:0 18px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;color:var(--text);background:var(--bg);line-height:1.72;overflow-x:hidden}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.mobile-header{height:62px;display:grid;grid-template-columns:52px 1fr 86px;align-items:center;padding:0 12px;background:#fff}.mobile-logo{justify-self:center}.mobile-logo 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