:root{--bg:#F4F7FA;--white:#fff;--light:#EAF1F6;--aqua:#E9F8F8;--navy:#102E46;--deep:#163C57;--cyan:#13B8C5;--blue:#237BD3;--title:#18364B;--text:#344C60;--muted:#64798A;--border:#DCE6ED;--footer:#0B2539}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:22px}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.8 Arial,'PingFang SC','Microsoft YaHei',sans-serif}a{color:#176AAB;text-decoration-thickness:1px;text-underline-offset:3px}a:hover{color:#075487}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--cyan);outline-offset:3px}h1,h2,h3,h4{color:var(--title);line-height:1.38;margin:0 0 .7em;font-weight:750}h1{font-size:clamp(32px,3vw,43px);letter-spacing:-.025em}h2{font-size:clamp(24px,2.1vw,28px)}h3{font-size:20px}p{margin:.1em 0 1.05em}ul,ol{padding-left:1.5em}li{margin:.3em 0}button{font:inherit;cursor:pointer}img{max-width:100%}.wrap{width:min(100% - 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