:root{--red:rgb(213,5,5);--dark:#171717;--text:#333;--muted:#666;--line:#e9e9e9;--light:#f6f6f6;--soft:#fff1f1;--deep:#a70404}*{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;color:var(--text);background:#fff;line-height:1.75}a{text-decoration:none;color:inherit}img{max-width:100%;display:block}.container{width:min(1220px,92%);margin:0 auto}.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:30}.mobile-header{height:62px;display:flex;align-items:center;justify-content:space-between;padding:0 14px;background:#fff}.menu-button{width:42px;height:42px;border:0;background:#fff;display:flex;flex-direction:column;justify-content:center;gap:5px;padding:0;cursor:pointer}.menu-button span{display:block;width:24px;height:2px;background:#222;border-radius:2px}.mobile-logo{position:absolute;left:50%;transform:translateX(-50%)}.mobile-logo 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