:root{--c-black:#121418;--c-blue:#3266ff;--c-ivory:#e5e1d7;--c-gray:#a0a5b2;--c-white:#f5f3ef;--c-dark-gray:#1a1d24;--font-serif-en:Georgia, "Times New Roman", serif;--font-serif-zh:"Songti SC", "STSong", "SimSun", serif;--font-sans:-apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;--font-mono:"IBM Plex Mono", Consolas, Monaco, monospace;--max-w:1280px;--nav-h:68px}*,:before,:after{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 20px)}body{background-color:var(--c-black);color:var(--c-ivory);font-family:var(--font-sans);-webkit-font-smoothing:antialiased;margin:0;font-size:15px;line-height:1.7;overflow-x:hidden}img{max-width:100%;display:block}a{color:inherit;text-decoration:none;transition:color .2s}h1,h2,h3,h4{margin:0;font-weight:700}p{margin:0}ul{margin:0;padding:0;list-style:none}button{font:inherit;cursor:pointer;color:inherit;background:0 0;border:none}:focus-visible{outline:2px solid 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