:root{--ink:#18364b;--text:#344c60;--muted:#64798a;--line:#dce6ed;--bg:#f4f7fa;--white:#fff;--nav:#102e46;--teal:#13b8c5;--blue:#237bd3;--pale:#eaf1f6;--aqua:#e9f8f8;--max:1200px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:25px}body{margin:0;background:var(--bg);font:16px/1.8 Arial,'PingFang SC','Microsoft YaHei',sans-serif;color:var(--text);overflow-wrap:break-word}a{color:#1265a9;text-decoration:none}a:hover{text-decoration:underline}button{font:inherit;cursor:pointer}img{max-width:100%;height:auto}h1,h2,h3{color:var(--ink);line-height:1.38;margin:0 0 .7em;font-weight:750}h1{font-size:clamp(2rem,3.2vw,2.25rem)}h2{font-size:clamp(1.45rem,2.25vw,1.75rem)}h3{font-size:1.2rem}p{margin:.4em 0 1.2em}ul,ol{padding-left:1.45em}li+li{margin-top:.5em}strong{color:var(--ink)}.wrap{width:min(var(--max),calc(100% - 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