:root{--blue:#4F6EF7;--blue2:#6B8AFF;--indigo:#3B5BDB;--deep:#2A3F9D;--ink:#1A1F2E;--text:#333847;--muted:#667085;--soft:#98A2B3;--bg:#fff;--bg2:#F5F8FF;--pale:#EAF0FF;--line:rgba(79,110,247,.14);--grayline:rgba(0,0,0,.08);--shadow:0 14px 40px rgba(30,40,80,.08);--blue-shadow:0 16px 42px rgba(79,110,247,.14);--radius:22px;--max:1280px;--nav:72px}*{box-sizing:border-box}html{scroll-behavior:smooth;overflow-x:hidden}body{margin:0;background:#fff;color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;line-height:1.75;overflow-x:hidden}body.panel-open{overflow:hidden}a{color:inherit;text-decoration:none}img{display:block;max-width:100%;height:auto}button,input{font:inherit}.site-header{position:sticky;top:0;z-index:80;background:rgba(255,255,255,.93);backdrop-filter:blur(18px);border-bottom:1px solid var(--grayline)}.nav-shell{height:var(--nav);max-width:var(--max);margin:auto;padding:0 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:focus-visible{outline:3px solid rgba(79,110,247,.35);outline-offset:3px}