:root{--bg:#F4F7FA;--white:#fff;--mist:#EAF1F6;--mint:#E9F8F8;--navy:#102E46;--deep:#163C57;--teal:#13B8C5;--blue:#237BD3;--heading:#18364B;--text:#344C60;--muted:#64798A;--border:#DCE6ED;--footer:#0B2539}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:28px}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif}a{color:#1465aa;text-decoration-thickness:1px;text-underline-offset:3px}a:hover{color:#075780}button{font:inherit;cursor:pointer}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #13B8C5;outline-offset:3px}h1,h2,h3,h4{color:var(--heading);line-height:1.38;margin:0 0 18px;font-weight:750}h1{font-size:36px}h2{font-size:27px}h3{font-size:20px}p{margin:0 0 18px}ul,ol{padding-left:24px}li{margin:0 0 8px}.wrap{width:min(1200px,calc(100% - 56px));margin-inline:auto}.article-width{max-width:780px}.section{margin-block:60px}.section-head{margin-bottom:26px}.section-head 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