:root{--paper:#F6F8F8;--white:#FFFFFF;--mist:#EAF0F2;--ink:#122E3B;--deep:#1A4050;--teal:#168E96;--link:#226D9D;--heading:#193946;--text:#374D58;--muted:#647981;--line:#D9E3E6;--footer:#0C2632}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:105px}body{margin:0;background:var(--paper);font-family:Arial,'PingFang SC','Microsoft YaHei',sans-serif;color:var(--text);font-size:16.5px;line-height:1.8}a{color:var(--link);text-underline-offset:4px}a:hover{color:var(--teal)}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--teal);outline-offset:4px}img{max-width:100%}.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:absolute;z-index:70;top:-70px;left:14px;background:#fff;padding:10px 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