:root{--page:#F4F7FA;--white:#fff;--mist:#EAF1F6;--aqua:#E9F8F8;--nav:#102E46;--dark:#163C57;--teal:#13B8C5;--blue:#237BD3;--title:#18364B;--text:#344C60;--muted:#64798A;--line:#DCE6ED}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Arial,'PingFang SC','Microsoft YaHei',sans-serif;background:var(--page);color:var(--text);font-size:16px;line-height:1.8}img{max-width:100%;height:auto}a{color:#1765a3;text-underline-offset:3px}a:hover{color:#0b7d96}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{color:var(--title);line-height:1.38;letter-spacing:-.018em}h1{font-size:clamp(2rem,3vw,2.3rem);margin:0 0 20px}h2{font-size:clamp(1.5rem,2.1vw,1.75rem);margin:0 0 18px}h3{font-size:1.22rem;margin:0 0 12px}p{margin:0 0 18px}strong{color:inherit}.container{width:min(1200px,calc(100% - 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