:root{--bg:#F5F7F9;--white:#fff;--light:#EDF2F5;--mint:#EAF7F5;--navy:#112E43;--navy2:#1D455B;--teal:#16A6A6;--link:#246DA8;--heading:#173548;--text:#354D5A;--muted:#667B85;--line:#DBE4E8;--footer:#0E293A}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:28px}body{margin:0;background:var(--bg);color:var(--text);font-family:Arial,'PingFang SC','Microsoft YaHei',sans-serif;font-size:16px;line-height:1.82;overflow-wrap:break-word}a{color:var(--link);text-underline-offset:3px}a:hover{color:var(--teal)}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--teal);outline-offset:3px}button{font:inherit;cursor:pointer}h1,h2,h3,p{margin-top:0}h1,h2,h3{color:var(--heading);line-height:1.35}h1{font-size:clamp(26px,3.25vw,42px);letter-spacing:-.025em}h2{font-size:clamp(21px,2.3vw,28px);margin-bottom:20px}h3{font-size:20px;margin-bottom:10px}p{margin-bottom:16px}section[id],nav[id]{scroll-margin-top:22px}.wrap{width:min(100% - 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