:root{--bg:#F4F7FA;--white:#fff;--pale:#EAF1F6;--mint:#E9F8F8;--navy:#102E46;--deep:#163C57;--teal:#13B8C5;--blue:#237BD3;--heading:#18364B;--ink:#344C60;--muted:#64798A;--line:#DCE6ED}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:Arial,'PingFang SC','Microsoft YaHei',sans-serif;font-size:16px;line-height:1.8}body.menu-open{overflow:hidden}h1,h2,h3{color:var(--heading);line-height:1.38;margin:0 0 18px}h1{font-size:36px}h2{font-size:27px}h3{font-size:20px}p{margin:0 0 16px}a{color:#1467aa;text-decoration-thickness:1px;text-underline-offset:4px}a:hover{color:#075184}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--teal);outline-offset:4px}img{max-width:100%;height:auto}button{font:inherit;cursor:pointer}main{min-height:50vh}.wrap{width:min(1200px,calc(100% - 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