:root{--red:rgb(213,5,5);--dark:#161616;--text:#343434;--muted:#6b7280;--line:#e8e8e8;--soft:#f6f6f6;--rose:#fff1f1;--shadow:0 14px 34px rgba(20,20,20,.08);--deep:#ad0303}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",Arial,sans-serif;background:#fff;color:var(--text);line-height:1.75;overflow-x:hidden}a{color:inherit;text-decoration:none}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}.header-inner{height:64px;display:flex;align-items:center;justify-content:space-between;gap:12px;max-width:1240px;margin:0 auto;padding:0 16px}.logo{position:absolute;left:50%;transform:translateX(-50%)}.logo img{height:40px;width:auto}.menu-btn{width:42px;height:42px;border:1px solid var(--line);border-radius:12px;background:#fff;display:flex;flex-direction:column;justify-content:center;gap:5px;padding:0 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