:root{--paper:#f8f8f5;--ink:#16191f;--blue:#244cff;--muted:#5d6370;--line:#dcdfe5;--font:Arial,'Helvetica Neue','PingFang SC','Microsoft YaHei',sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:20px}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.5 var(--font)}button,input,select{font:inherit;color:inherit}button,a,summary,select{cursor:pointer;touch-action:manipulation}button{transition:background .18s,color .18s,transform .18s}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--blue);outline-offset:4px}button:hover{color:var(--blue)}[hidden]{display:none!important}.skip{position:absolute;top:-100px;left:20px;z-index:50;background:var(--blue);color:white;padding:12px}.skip:focus{top:10px}.preview{text-align:center;font-size:10px;letter-spacing:.12em;padding:8px 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