:root{--primary:rgb(176, 219, 245);--primary-dark:#1d6b95;--blue:#0c3452;--blue-2:#155a82;--light:#f4fbff;--line:#d9edf8;--text:#172434;--muted:#667787;--white:#fff;--shadow:0 16px 45px rgba(12,52,82,.08);--radius:20px}*{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;background:#fff;color:var(--text);line-height:1.75;overflow-x:hidden}a{text-decoration:none;color:inherit}img{max-width:100%;display:block}.container{width:min(1180px,calc(100% - 32px));margin:0 auto}.site-header{background:#fff;border-bottom:1px solid #edf4f8;position:sticky;top:0;z-index:20}.mobile-header{height:64px;display:grid;grid-template-columns:52px 1fr 74px;align-items:center;padding:0 14px;background:#fff}.desktop-header{display:none}.mobile-logo img{height:34px;margin:0 auto}.desktop-logo 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