:root{--bg:#F4F7FA;--surface:#fff;--pale:#EAF1F6;--tint:#E9F8F8;--nav:#102E46;--deep:#163C57;--teal:#13B8C5;--blue:#237BD3;--heading:#18364B;--text:#344C60;--muted:#64798A;--line:#DCE6ED;--footer:#0B2539}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.8 Arial,'PingFang SC','Microsoft YaHei',sans-serif}h1,h2,h3,p{margin-top:0}h1,h2,h3{color:var(--heading);line-height:1.4}h1{font-size:clamp(27px,3.2vw,42px);letter-spacing:-.025em}h2{font-size:clamp(21px,2.2vw,28px)}h3{font-size:19px}p{margin-bottom:1.1em}a{color:var(--blue);text-underline-offset:4px}a:hover{color:#075d98}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--teal);outline-offset:3px}.container{width:min(100% - 56px,1200px);margin-inline:auto}.reading{max-width:790px}.section{padding:56px 0}.section-tight{padding:34px 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