:root{--bg:#e9f1fa;--card:#fff;--ink:#0d1b3e;--body-c:#3f4c6b;--dim:#7a86a3;--hair:#0d1b3e1a;--blue:#1b4bc0;--blue-2:#2f6fe8;--blue-deep:#12327f;--grad:linear-gradient(135deg, #12327f 0%, #1b4bc0 55%, #2f6fe8 100%);--font:-apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, "Segoe UI", Arial, sans-serif;--col:760px}*{box-sizing:border-box}html{scroll-behavior:smooth;overflow-x:clip}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}body{background:var(--bg);color:var(--ink);font-family:var(--font);-webkit-font-smoothing:antialiased;margin:0;font-size:16px;line-height:1.6;overflow-x:clip}::selection{background:var(--blue);color:#fff}a{color:inherit;text-decoration:none}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--blue);outline-offset:3px;border-radius:4px}img{max-width:100%}.backdrop{z-index:-1;background:var(--bg);position:fixed;inset:0;overflow:hidden}.backdrop:before{content:"";background:var(--backdrop-img) center 30% / cover no-repeat;filter:blur(48px)saturate(1.1);opacity:.55;position:absolute;inset:-12%}.backdrop:after{content:"";background:linear-gradient(#e9f1fa59,#e9f1fad9);position:absolute;inset:0}nav{z-index:60;-webkit-backdrop-filter:blur(16px)saturate(1.4);background:#ffffffb8;border-bottom:1px solid #0d1b3e14;height:56px;position:fixed;top:0;left:0;right:0}.nav-in{align-items:center;gap:12px;max-width:960px;height:100%;margin:0 auto;padding:0 16px;display:flex}.brand{align-items:center;gap:14px;min-width:0;margin-right:auto;display:flex}.brand img{flex-shrink:0;width:auto;height:26px;display:block}.brand span{color:var(--dim);white-space:nowrap;text-overflow:ellipsis;border-left:1px solid var(--hair);padding-left:14px;font-size:12.5px;font-weight:500;line-height:1;overflow:hidden}@media (max-width:760px){.brand span{display:none}.brand img{max-width:calc(100vw - 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