:root{--bg:#E6EBF2;--nav:#F5F7FB;--white:#fff;--soft:#EEF2F7;--soft2:#DDE4EE;--blue:#289CFF;--text:#243447;--muted:#66788A;--note:#8A9AAF;--border:rgba(40,156,255,.16);--shadow:0 14px 36px rgba(56,92,138,.12);--grad:linear-gradient(180deg,#32D1F6 0%,#27B9F4 35%,#249BFF 100%)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.75 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;overflow-x:hidden}a{color:inherit;text-decoration:none}img{max-width:100%;height:auto;display:block}.shell{width:min(1180px,calc(100% - 32px));margin:auto}.site-header{position:sticky;top:0;z-index:20000;background:rgba(245,247,251,.96);backdrop-filter:blur(12px);border-bottom:1px solid rgba(40,156,255,.1)}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:22px;min-height:72px}.logo{flex:0 0 auto}.logo img{max-height:50px;width:auto}.nav-wrap{flex:1 1 auto;min-width:0;display:flex;justify-content:center}.nav{display:flex;align-items:center;gap:20px;white-space:nowrap;flex-wrap:nowrap}.nav>a,.nav-button{position:relative;border:0;background:none;color:#4E5F7A;font:inherit;padding:24px 0 20px;cursor:pointer}.nav>a:hover,.nav-button:hover,.nav 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