:root{--bg:#F4F5F7;--surface:#fff;--soft:#EEF1F5;--line:#DDE2EA;--red:#D60000;--deep:#A90000;--text:#1D222B;--muted:#5B6472;--quiet:#87909E;--shadow:0 16px 38px rgba(24,32,46,.08);--radius:20px;--header:114px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.75;padding-top:var(--header)}body.drawer-open{overflow:hidden}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.shell{width:min(1180px,calc(100% - 32px));margin:auto}.site-header{position:fixed;inset:0 0 auto;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid rgba(20,28,40,.08)}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:72px}.logo{flex:0 0 auto}.logo 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