:root{--primary:rgb(176,219,245);--primary-dark:#5aa6d0;--deep:#123653;--text:#17212b;--muted:#5b6875;--bg:#f4f9fd;--line:#d9edf8;--white:#fff;--shadow:0 14px 34px rgba(18,54,83,.08)}*{box-sizing:border-box}html,body{overflow-x:hidden}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}a{text-decoration:none;color:inherit}img{max-width:100%;display:block}.container{width:min(1200px,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:72px 1fr 82px;align-items:center;padding:0 14px}.menu-button{width:42px;height:42px;border:0;background:#fff;display:flex;flex-direction:column;justify-content:center;gap:5px;padding:0 9px}.menu-button 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