:root{--bg:#F4F7FA;--surface:#fff;--soft:#EAF1F6;--mint:#E9F8F8;--navy:#102E46;--deep:#163C57;--teal:#13B8C5;--blue:#237BD3;--heading:#18364B;--text:#344C60;--muted:#64798A;--line:#DCE6ED}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:28px}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.82 Arial,"PingFang SC","Microsoft YaHei",sans-serif;overflow-wrap:break-word}body.drawer-open{overflow:hidden}a{color:#176b9b;text-decoration:none}a:hover{text-decoration:underline}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #12a2b0;outline-offset:3px}img{max-width:100%}p{margin:0 0 1.15em}h1,h2,h3,h4{color:var(--heading);line-height:1.38;margin:0 0 .7em}h1{font-size:clamp(27px,3.6vw,42px)}h2{font-size:clamp(21px,2.4vw,28px)}h3{font-size:clamp(18px,1.8vw,21px)}ul,ol{padding-left:1.3em}li{margin:.35em 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