:root{--red:rgb(213,5,5);--dark:#151515;--text:#333;--muted:#747474;--line:#e8e8e8;--soft:#f6f6f6;--rose:#fff1f1;--deep:#a90404}*{box-sizing:border-box}html,body{margin:0;padding:0;overflow-x:hidden}body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",Arial,sans-serif;background:#f7f7f7;color:var(--text);line-height:1.72}.container{width:min(1200px,calc(100% - 32px));margin:auto}a{text-decoration:none;color:inherit}img{max-width:100%;display:block;height:auto}.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:999}.topbar{height:66px;display:flex;align-items:center;gap:18px}.logo{display:flex;align-items:center;justify-content:center;flex:1}.logo img{max-height:42px;width:auto}.desktop-nav{display:none}.menu-btn{width:42px;height:42px;border:0;background:#fff;display:flex;flex-direction:column;gap:5px;justify-content:center}.menu-btn 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