:root{--bg:#F4F7FA;--white:#fff;--tint:#EAF1F6;--mint:#E9F8F8;--navy:#102E46;--dark:#163C57;--cyan:#13B8C5;--blue:#237BD3;--title:#18364B;--text:#344C60;--muted:#64798A;--line:#DCE6ED;--footer:#0B2539}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:25px}body{margin:0;min-width:0;background:var(--bg);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--text)}a{color:#1467ae;text-underline-offset:3px}a:hover{color:#075285}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--cyan);outline-offset:3px}h1,h2,h3{color:var(--title);line-height:1.38;margin:0 0 .7em}h1{font-size:clamp(2rem,2.7vw,2.25rem)}h2{font-size:clamp(1.45rem,2.1vw,1.75rem)}h3{font-size:clamp(1.12rem,1.5vw,1.3rem)}p{margin:.6em 0 1.15em}small,.muted{color:var(--muted)}.wrap{width:min(100% - 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