:root{--primary:rgb(176,219,245);--primary-deep:#1d6f9f;--blue:#103a5b;--light:#eef8fe;--line:#d6edf9;--text:#101820;--muted:#5d6b78;--gray:#f5f7fa;--white:#fff;--shadow:0 14px 36px rgba(16,58,91,.08)}*{box-sizing:border-box}html{overflow-x:hidden}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;color:var(--text);background:linear-gradient(180deg,#fff 0,#f4fbff 100%);line-height:1.7;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 var(--line);position:sticky;top:0;z-index:50}.mobile-header{height:62px;display:grid;grid-template-columns:76px 1fr 76px;align-items:center;padding:0 14px;background:#fff}.menu-btn{width:42px;height:42px;border:0;background:#fff;display:flex;flex-direction:column;gap:5px;justify-content:center;align-items:center}.menu-btn 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