:root{--bg:#0D121A;--bg1:#111827;--bg2:#151D2B;--bg3:#182334;--bg4:#202B3D;--gold:#E8CF92;--gold2:#C8A96A;--blue:#A9C4E4;--cyan:#79B7C9;--sage:#8FB8A8;--text:#EDF2F7;--text2:#B8C2D2;--text3:#8E9AAF;--footer:#080C12;--line:rgba(232,207,146,.12);--shadow:0 18px 44px rgba(0,0,0,.30)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:"Microsoft YaHei","PingFang SC",system-ui,sans-serif;line-height:1.75;overflow-x:hidden}a{color:inherit;text-decoration:none}img{display:block;max-width:100%;height:auto}button{font:inherit}.shell{width:min(1180px,calc(100% - 40px));margin:auto}.site-header{position:sticky;top:0;z-index:9999;background:rgba(13,18,26,.92);backdrop-filter:blur(12px);box-shadow:0 8px 28px rgba(0,0,0,.18)}.header-main{height:76px;display:flex;align-items:center;gap:28px}.brand-logo{width:138px;flex:0 0 auto}.brand-logo 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