:root{--bg:#F4F7FA;--white:#fff;--mist:#EAF1F6;--aqua:#E9F8F8;--navy:#102E46;--dark:#163C57;--teal:#13B8C5;--blue:#237BD3;--heading:#18364B;--ink:#344C60;--muted:#64798A;--border:#DCE6ED;--radius:14px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:22px}body{margin:0;background:var(--bg);color:var(--ink);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.8;overflow-wrap:break-word}img{max-width:100%}h1,h2,h3{color:var(--heading);line-height:1.36;letter-spacing:-.02em}h1{font-size:clamp(32px,3.1vw,43px);margin:.3em 0 .65em}h2{font-size:clamp(23px,2.1vw,28px);margin:0 0 .75em}h3{font-size:20px;margin:0 0 .5em}p{margin:.7em 0 1.2em}a{color:#146db4;text-decoration:none}a:hover{text-decoration:underline}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid 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