:root{--paper:#f6f5f0;--ink:#202422;--muted:#71766d;--line:#dfdfd5;--purple:#6948db;--lime:#dfff7b;--white:#fff;--radius:18px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.65}button,input,select,textarea{font:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}a{color:inherit;text-decoration:none}a:hover{text-decoration:underline;text-underline-offset:4px}button{cursor:pointer}button:disabled{opacity:.5;cursor:wait}[hidden]{display:none!important}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #9b85ed;outline-offset:4px}h1,h2,h3,p{margin-top:0}h2{letter-spacing:-.04em}h3{line-height:1.5}p{overflow-wrap:anywhere}.shell{width:min(1200px,calc(100% - 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